WO2015100643A1 - Procédé, équipement et système de synchronisation entre stations - Google Patents

Procédé, équipement et système de synchronisation entre stations Download PDF

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Publication number
WO2015100643A1
WO2015100643A1 PCT/CN2013/091176 CN2013091176W WO2015100643A1 WO 2015100643 A1 WO2015100643 A1 WO 2015100643A1 CN 2013091176 W CN2013091176 W CN 2013091176W WO 2015100643 A1 WO2015100643 A1 WO 2015100643A1
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WIPO (PCT)
Prior art keywords
base station
carrier
synchronization signal
format
listening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2013/091176
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English (en)
Chinese (zh)
Inventor
郑娟
马莎
李强
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/CN2013/091176 priority Critical patent/WO2015100643A1/fr
Priority to CN201380002675.3A priority patent/CN105052219B/zh
Publication of WO2015100643A1 publication Critical patent/WO2015100643A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/002—Mutual synchronization

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, device, and system for inter-station synchronization.
  • micro base station is characterized by small coverage and low transmission power, and is suitable for providing a high-speed data transmission service, which can perform data distribution on the macro cellular network and reduce the network deployment cost of the operator.
  • the base station that acquires the synchronization signal through other base stations is generally referred to as the target base station.
  • a base station that will provide synchronization signals for other base stations is called a source base station (Source eNB).
  • a base station including a target base station and a source base station
  • the base station separately transmits signals on each carrier.
  • Figure 1 is a schematic diagram of synchronization between base stations in a multi-carrier scenario, as shown in Figure 1, in the source base station and the target base station.
  • the base station is configured with multiple carriers in the intra-band, such as CC 1 and CC2. Therefore, for the multi-carrier scenario, synchronization between the base stations is maintained while maintaining synchronization between the base stations.
  • network listening can be used between base stations to implement synchronization between base stations.
  • the base station may choose to turn off a certain carrier, and when the carrier is sent to the target base station.
  • the target base station and the source base station are out of synchronization.
  • the carrier of the synchronization signal ie, the synchronization carrier
  • the target base station and the source base station are out of synchronization.
  • the carrier CC1 and the carrier CC1 are configured.
  • the target base station of CC2 is out of step with the source base station.
  • the target base station in order to avoid the problem that the target base station is out of synchronization after the source base station turns off the synchronization carrier, it is required to provide an inter-station synchronization method, so that the target base station remains synchronized after the source base station turns off the synchronization carrier.
  • the target base station after the source base station turns off the synchronization carrier, the target base station searches for a new source base station capable of providing a synchronization signal, and implements inter-station synchronization according to the synchronization signal carried on the new source base station.
  • the target base station cannot serve the user equipment in the process of re-searching for the new source base station, which has a greater impact on the data transmission of the user equipment, and increases network listening overhead.
  • Embodiments of the present invention provide a method, device, and system for inter-station synchronization. After the first base station turns off the synchronization carrier, the second base station can implement inter-station synchronization without re-searching the source base station, which reduces the impact on the data transmission of the user equipment and reduces the network listening overhead.
  • the technical solution of the embodiment of the present invention is to provide a method for synchronizing between stations, including: receiving, by the first base station, indication information sent by the second base station, where the indication information is The identifier of the second base station and the identifier of the interception carrier that the second base station listens to the synchronization signal; if the first base station determines, according to the indication information, the first carrier and the first base station to be closed The listening carrier is the same; after the first carrier is turned off, according to the pre The strategy is to send a synchronization signal to the second base station.
  • the sending, by the first base station, the synchronization signal to the second base station according to the preset policy The second base station transmits a synchronization signal.
  • the method further includes: sending, by the first base station, a replacement listening carrier frequency to the second base station The information about the point is such that the second base station listens to the synchronization signal on the same listening carrier as the second carrier, where the information about the replacement of the interception carrier frequency includes notifying the second base station And the information of the second carrier is changed, and the identifier of the second carrier is used, and the identifier of the second carrier is changed, and the effective time of the second base station to replace the interception carrier is included;
  • the effective time for the second base station to change the listening carrier is the time when the second base station starts to listen to the synchronization signal on the same listening carrier as the second carrier.
  • the indication information further includes the second base station a network listening format, where the network listening format includes a time resource and a frequency resource used by the second base station to listen to the synchronization signal; or the network listening format includes the second base station listening synchronization The time resource and the frequency resource and the sequence resource used by the signal; correspondingly, the first base station sends the synchronization signal to the second base station on the second carrier, including: the first base station according to the second base station The network listening format transmits a synchronization signal to the second base station on the second carrier by using a synchronization signal format that is the same as the network listening format of the second base station.
  • the first base station is configured on the second carrier
  • the sending, by the second base station, a synchronization signal includes: The first base station sends a synchronization signal to the second base station on the second carrier according to a synchronization signal format of the second carrier-bearing synchronization signal configured by the first base station, where the synchronization signal format And including a time resource and a frequency resource used by the first base station to send a synchronization signal; or, the synchronization signal format includes a time resource and a frequency resource used by the first base station to send a synchronization signal, and a sequence resource.
  • the information related to the frequency of the interception of the carrier frequency includes: the second carrier carrying the synchronization signal Synchronization signal format.
  • the indication information further includes a network listening format of the second base station, where the network listening format includes the second base station Detecting a time resource and a frequency resource used by the synchronization signal; or, the network listening format includes a time resource and a frequency resource and a sequence resource used by the second base station to listen to the synchronization signal; correspondingly, the And sending the synchronization signal to the second base station, including: according to the network listening format of the second base station, opening the first carrier in a time resource that is the same as the network listening format of the second base station And transmitting, according to the network listening format of the second base station, a synchronization signal to the second base station on the first carrier.
  • the sending, by the first base station, the synchronization signal to the second base station includes: configuring, by the first base station, the first carrier to carry a synchronization signal a synchronization signal format, the first carrier is turned on in a same time resource as the synchronization signal format, and the second carrier is on the first carrier according to a synchronization signal format of the first carrier-bearing synchronization signal
  • the base station sends a synchronization signal, where the synchronization signal format includes a time resource and a frequency resource used by the first base station to send a synchronization signal; or, the synchronization signal format includes a time when the first base station sends a synchronization signal Resource and frequency resources as well as sequence resources.
  • the method further includes: the first base station sending the first base station to the second base station The configured first carrier carries a synchronization signal format of
  • the first base station configures, on a third carrier, a subframe corresponding to the same time resource of the network listening format or the synchronization signal format as a multimedia broadcast single frequency network subframe or a restricted measurement set.
  • a subframe or an uplink subframe where the third carrier is a carrier that sends information to the user equipment after the first carrier is turned off; or the first base station sends the third carrier to the network listening format or
  • the time slots in the subframe corresponding to the time resource with the same synchronization signal format are configured as guard intervals.
  • a second aspect provides a method for inter-station synchronization, including: a second base station selecting a listening carrier and a first base station;
  • the second base station sends the indication information to the first base station, so that the first base station determines, according to the indication information, that the first carrier to be closed by the first base station is the same as the interception carrier, and the After the first carrier is closed, the synchronization signal is sent to the second base station according to a preset policy, where the indication information includes an identifier of the second base station and an identifier of a listening carrier of the second base station listening for a synchronization signal.
  • the second base station listens to the synchronization signal sent by the first base station according to a preset policy.
  • the detecting, by the second base station, the synchronization signal that is sent by the first base station according to the preset policy includes: The second base station listens to the synchronization signal sent by the first base station to the second base station on the second carrier on the same carrier as the second carrier frequency of the first base station.
  • the method further includes: the second base station receiving, by the first base station, related information of the frequency of the replacement of the interception carrier, where the information about the frequency of the replacement of the interception carrier includes notifying the second base station to replace the interception.
  • the information of the carrier and the identifier of the second carrier or, the information that is used to notify the second base station to replace the interception carrier, the identifier of the second carrier, and the effective time of the second base station to replace the interception carrier;
  • the effective time of the second base station to replace the listening carrier is the time at which the second base station starts to listen to the synchronization signal on the same listening carrier as the second carrier.
  • the indication information further includes a network listening format of the second base station, where the network detecting The listening format includes the time resource and the frequency resource used by the second base station to listen to the synchronization signal; or the network listening format includes the time resource and the frequency resource used by the second base station to listen to the synchronization signal; or The network listening format includes a time resource and a frequency resource used by the second base station to listen to the synchronization signal, and a sequence resource.
  • the second base station is in the same second carrier frequency as the first base station.
  • the method includes: the second base station according to the network interception information format information of the second base station, Listening to the synchronization signal on a carrier with the same second carrier frequency of the first base station, where the synchronization signal is used by the first base station on the second carrier and the second base station
  • the network listening format is sent in the same sync signal format.
  • the first aspect of the second aspect is combined
  • the second base station listens to the synchronization signal sent by the first base station to the second base station on the second carrier on the same carrier as the second carrier frequency of the first base station. , including:
  • the second base station uses the same network listening format as the synchronization signal on the same carrier as the second carrier frequency of the first base station according to the synchronization signal format of the second carrier-bearing synchronization signal. Listening to the synchronization signal, where the synchronization signal is sent by the first base station according to the synchronization signal format on the second carrier, and the synchronization signal format includes the first base station transmitting a synchronization signal.
  • the time resource and the frequency resource used; or the synchronization signal format includes a time resource and a frequency resource and a sequence resource used by the first base station to send the synchronization signal.
  • the information about the replacement of the interception carrier frequency point further includes: the second carrier carrying the synchronization signal Synchronization signal format.
  • the indication information further includes a network listening format of the second base station, where the network listening format includes the second base station Detecting time resources and frequency resources used by the synchronization signal; or, the network listening format includes time resources and frequency resources and sequence resources used by the second base station to listen for synchronization signals;
  • the second base station is configured to listen to the synchronization signal sent by the first base station according to the preset policy, and includes:
  • the second base station listens to the synchronization signal by using a network listening format of the second base station, where the synchronization signal is used by the first base station according to a network listening format of the second base station,
  • the first carrier is turned on in a time resource of the same network listening format of the second base station, and is sent to the second base station in the first carrier according to a network listening format of the second base station.
  • the method further includes: the second base station receiving, by the first base station, the first carrier configured by the first base station a synchronization signal format carrying a synchronization signal;
  • the second base station is configured to listen to the synchronization signal sent by the first base station according to the preset policy, and includes:
  • the second base station is configured to listen to the synchronization signal by using a network listening format that is in the same format as the synchronization signal, where the synchronization signal is used by the first base station according to the first a synchronization signal format of the first carrier that carries the synchronization signal configured by the base station, by opening the first carrier in a time resource of the same format as the synchronization signal, and carrying a synchronization signal of the synchronization signal according to the first carrier
  • the format is sent on the first carrier, where the synchronization signal format includes a time resource and a frequency resource used by the first base station to send a synchronization signal; or the synchronization signal format includes the first base station sending synchronization Time and frequency resources and sequence resources used by the signal.
  • a first base station including: a receiving unit, configured to receive indication information sent by a second base station, where the indication information includes an identifier of the second base station, and the second base station detects synchronization And a sending unit, configured to: if the first base station determines, according to the indication information, that the first carrier to be closed by the first base station is the same as the interception carrier, After the carrier is turned off, the synchronization signal is sent to the second base station according to a preset policy.
  • the sending unit is specifically configured to: send a synchronization signal to the second base station on the second carrier.
  • the sending unit is further configured to: send, to the second base station, a correlation of replacing a listening carrier frequency point The information, so that the second base station listens to the synchronization signal on the same listening carrier as the second carrier, where the information about the frequency of the replacement listening carrier includes Notifying the second base station to replace the information of the interception carrier and the identifier of the second carrier; or, including: notifying the second base station to replace the information of the interception carrier, the identifier of the second carrier, and the second base station replacing the interception carrier
  • the effective time of the second base station to change the listening carrier is the time when the second base station starts to listen to the synchronization signal on the same listening carrier as the second carrier.
  • the indication information further includes the second base station a network listening format, where the network listening format includes a time resource and a frequency resource used by the second base station to listen to the synchronization signal; or the network listening format includes the second base station listening synchronization
  • the sending unit is further configured to: use, according to the network listening format of the second base station, the same network listening format as the second base station
  • the synchronization signal format transmits a synchronization signal to the second base station on the second carrier.
  • the sending unit is further configured to:
  • the second carrier configured by the first base station carries a synchronization signal format of the synchronization signal, and sends a synchronization signal to the second base station on the second carrier, where the synchronization signal format includes the first base station sending synchronization The time resource and the frequency resource used for the signal; or, the synchronization signal format includes a time resource and a frequency resource and a sequence resource used by the first base station to send the synchronization signal.
  • the sending unit is further configured to: send, by the second base station, the first base station configuration The synchronization signal format of the second carrier carrying the synchronization signal.
  • the indication information further includes a network listening format of the second base station, where the network listening format includes a time resource and a frequency resource used by the second base station to listen to a synchronization signal; or The listening format includes the time resource and the frequency resource and the sequence resource used by the second base station to listen to the synchronization signal.
  • the sending unit is specifically configured to: according to the network listening format of the second base station, The first carrier is turned on in a time resource in which the network listening mode of the second base station is the same, and the synchronization signal is sent to the second base station in the first carrier according to the network listening format of the second base station.
  • the sending unit is specifically configured to: configure, according to the first base station, a synchronization signal format of the first carrier to carry a synchronization signal, Transmitting the first carrier in a time resource of the same synchronization signal format, and transmitting a synchronization signal to the second base station on the first carrier according to a synchronization signal format of the first carrier-bearing synchronization signal, where
  • the synchronization signal format includes a time resource and a frequency resource used by the first base station to transmit a synchronization signal; or, the synchronization signal format includes a time resource and a frequency resource and a sequence resource used by the first base station to send a synchronization signal.
  • the sending unit is further configured to: send, to the second base station, the first base station configured The synchronization signal format of the first carrier carrying the synchronization signal.
  • the first The base station further includes: a configuration unit, configured to configure, on the third carrier, a subframe corresponding to the same time resource of the network listening format or the synchronization signal format as a multimedia broadcast single frequency network subframe or a restricted measurement set An outer sub-frame or an uplink-downlink sub-frame, where the third carrier is a carrier that sends information to the user equipment after the first carrier is turned off; Or, the time slot in the subframe corresponding to the time resource of the network carrier format or the synchronization signal format on the third carrier is configured as a guard interval.
  • a second base station including:
  • a selecting unit configured to select a listening carrier and a first base station
  • a sending unit configured to send, to the first base station, indication information, so that the first base station determines, according to the indication information, that the first base station is to be turned off.
  • the first carrier is the same as the interception carrier, and after the first carrier is turned off, the synchronization signal is sent to the second base station according to a preset policy, where the indication information includes the identifier and location of the second base station.
  • the intercepting unit is configured to listen to the synchronization signal sent by the first base station according to a preset policy.
  • the listening unit is specifically configured to: listen to the first carrier on a carrier that is the same as the second carrier frequency of the first base station A synchronization signal transmitted by a base station to the second base station on a second carrier.
  • the second base station receives, by the first base station, related information about a frequency of a replacement listening carrier that is sent by the first base station, where And the information about the information about the second carrier is changed, and the information about the second carrier is used to notify the second base station to replace the interception carrier, and the second carrier is included. And an effective time of the second base station to replace the listening carrier; wherein, the second base station changes the effective time of the listening carrier, the second base station starts to be on the same listening carrier as the second carrier The time to listen for the sync signal.
  • the indication information further includes a network listening format of the second base station, where the network Detecting The listening format includes the second base station listening synchronization signal ⁇ a time resource and a frequency resource; or the network listening format includes a time resource and a frequency resource used by the second base station to listen to the synchronization signal; or the network listening format includes the second base station Listening to the time resource and the frequency resource of the synchronization signal and the sequence resource; correspondingly, the listening unit is further configured to: according to the network interception information format information of the second base station, in the first base station Listening to the synchronization signal on a carrier with the same carrier frequency, wherein the synchronization signal is sent by the first base station on the second carrier in the same synchronization signal format as the network detection format of the second base station.
  • the intercepting unit is further configured to: according to the synchronization signal format of the second carrier carrying the synchronization signal, in combination with the second possible implementation manner of the fourth aspect, And synchronizing the synchronization signal with a network listening format that is the same as the synchronization signal format on a carrier that is the same as the second carrier frequency of the first base station, where the synchronization signal is used by the first base station And transmitting, according to the synchronization signal format, on the second carrier, the synchronization signal format includes a time resource and a frequency resource used by the first base station to send a synchronization signal; or, the synchronization signal format includes the A base station transmits time resources and frequency resources used by the synchronization signal and sequence resources.
  • the second base station receives a synchronization signal format of the second carrier bearer synchronization signal sent by the first base station.
  • the indication information further includes a network listening format of the second base station, where the network listening format includes the second base station Detecting time resources and frequency resources used by the synchronization signal; or, the network listening format includes time resources and frequency resources and sequence resources used by the second base station to listen for synchronization signals;
  • the listening unit is specifically configured to: listen to by using the network of the second base station
  • the format is to listen to the synchronization signal, where the synchronization signal is used by the first base station according to a network listening format of the second base station, and is in the same time resource as the network listening format of the second base station.
  • the second base station receives, by the first base station, a synchronization signal of the first carrier bearer synchronization signal configured by the first base station
  • the listening unit is specifically configured to: according to the synchronization signal format, listen to the synchronization signal by using a network listening format with the same format as the synchronization signal, where the synchronization signal is used by Transmitting, by the first base station, the first carrier according to a synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station, by using the first carrier in the same time resource as the synchronization signal format, according to the The synchronization signal format of the first carrier carrying the synchronization signal is sent on the first carrier; wherein the synchronization signal format includes a time resource and a frequency resource used by the first base station to send a synchronization signal; or, the synchronization signal
  • the format includes a time resource and a frequency resource and a sequence resource used by the
  • a first base station including:
  • a communication unit configured to receive indication information that is sent by the second base station, where the indication information includes an identifier of the second base station and an identifier of a listening carrier of the second base station listening for a synchronization signal;
  • a processor configured to: if the first base station determines, according to the indication information received by the communication unit, that the first carrier to be closed by the first base station is the same as the interception carrier; And sending a synchronization signal to the second base station according to a preset policy.
  • the processor is specifically configured to: send synchronization to the second base station on the second carrier Signal.
  • the communications unit is further configured to: send, to the second base station, a correlation of changing a listening carrier frequency point The information, so that the second base station listens to the synchronization signal on the same listening carrier as the second carrier, where the information about the replacement of the interception carrier frequency includes notifying the second base station to replace the interception.
  • the information of the carrier and the identifier of the second carrier or, the information that is used to notify the second base station to replace the interception carrier, the identifier of the second carrier, and the effective time of the second base station to replace the interception carrier;
  • the effective time of the second base station to replace the listening carrier is the time at which the second base station starts to listen to the synchronization signal on the same listening carrier as the second carrier.
  • the indication information further includes the second base station a network listening format, where the network listening format includes a time resource and a frequency resource used by the second base station to listen to the synchronization signal; or the network listening format includes the second base station listening synchronization
  • the processor is further configured to: use, according to the network listening format of the second base station, the same network listening format as the second base station
  • the synchronization signal format transmits a synchronization signal to the second base station on the second carrier.
  • the processor is further configured to: send a synchronization signal to the second base station on the second carrier according to a synchronization signal format of the second carrier-bearing synchronization signal configured by the first base station, where
  • the synchronization signal format includes a time resource and a frequency resource used by the first base station to transmit a synchronization signal; or, the synchronization signal format includes a time resource and a frequency resource used by the first base station to send a synchronization signal, and a sequence resource.
  • the communication unit is further configured to: send, by the second base station, the first base station configuration The synchronization signal format of the second carrier carrying the synchronization signal.
  • the indication information further includes a network listening format of the second base station, where the network listening format includes the second The base station listens to the time resource and the frequency resource used by the synchronization signal; or the network listening format includes the time resource and the frequency resource and the sequence resource used by the second base station to listen to the synchronization signal; correspondingly, the processing The device is specifically configured to: open, according to a network listening format of the second base station, the first carrier in a time resource that is the same as a network listening format of the second base station, according to the network of the second base station The listening format transmits a synchronization signal to the second base station on the first carrier.
  • the processor is specifically configured to: configure, according to the first base station, a synchronization signal format of the first carrier to carry a synchronization signal, Transmitting the first carrier in a time resource of the same synchronization signal format, and transmitting a synchronization signal to the second base station on the first carrier according to a synchronization signal format of the first carrier-bearing synchronization signal, where
  • the synchronization signal format includes a time resource and a frequency resource used by the first base station to transmit a synchronization signal; or, the synchronization signal format includes a time resource and a frequency resource and a sequence resource used by the first base station to send a synchronization signal.
  • the communications unit is further configured to: send, by the second base station, the first base station configuration The synchronization signal format of the first carrier carrying the synchronization signal.
  • the processor is further configured to: connect the third carrier with the network listening format or the synchronization signal
  • the subframes corresponding to the same time resource are configured as a sub-frame or an uplink-downlink sub-frame in the multimedia broadcast single-frequency network subframe or the restricted measurement set, where the third carrier is after the first carrier is turned off. a carrier that the user equipment transmits information;
  • the time slot in the subframe corresponding to the time resource of the network carrier format or the synchronization signal format on the third carrier is configured as a guard interval.
  • a second base station including: a processor, configured to select a listening carrier and a first base station;
  • a communication unit configured to send the indication information to the first base station, so that the first base station determines, according to the indication information, that the first carrier to be closed by the first base station is the same as the interception carrier, After the first carrier is turned off, the synchronization signal is sent to the second base station according to a preset policy, where the indication information includes an identifier of the second base station and a listening carrier of the second base station that listens to the synchronization signal.
  • the processor is specifically configured to: listen to the first on a carrier that is the same as a second carrier frequency of the first base station a synchronization signal transmitted by the base station to the second base station on the second carrier.
  • the communications unit is further configured to: receive information related to the frequency of the replacement listening carrier sent by the first base station And the information about the frequency of the replacement of the interception carrier includes information for notifying the second base station to replace the interception carrier and the identifier of the second carrier;
  • the second base station including information that notifies the second base station to replace the interception carrier, the second carrier And an effective time of the second base station to replace the listening carrier; wherein, the second base station changes the effective time of the listening carrier, the second base station starts to be on the same listening carrier as the second carrier The time to listen for the sync signal.
  • the indication information further includes a network listening format of the second base station, where the network detection
  • the listening format includes the time resource and the frequency resource used by the second base station to listen to the synchronization signal; or the network listening format includes the time resource and the frequency resource used by the second base station to listen to the synchronization signal; or
  • the network listening format includes a time resource and a frequency resource and a sequence resource used by the second base station to listen to the synchronization signal.
  • the processor is further configured to: according to the network interception information of the second base station Format information, listening to the synchronization signal on a carrier that is the same as the second carrier frequency of the first base station, where the synchronization signal is used by the first base station on the second carrier and the second The base station's network listening format is transmitted in the same synchronous signal format.
  • the processor is further configured to: use, according to a synchronization signal format of the second carrier-bearing synchronization signal, a network having the same format as the synchronization signal on a carrier that is the same as a second carrier frequency of the first base station
  • the listening format is configured to listen to the synchronization signal, where the synchronization signal is sent by the first base station according to the synchronization signal format on the second carrier, where the synchronization signal format includes the first base station sending The time resource and the frequency resource used by the synchronization signal; or the synchronization signal format includes a time resource and a frequency resource and a sequence resource used by the first base station to send the synchronization signal.
  • the communication unit is further configured to receive a synchronization signal format of the second carrier-bearing synchronization signal sent by the first base station.
  • the indication information further includes a network listening format of the second base station, where the network listening format includes the second base station Detecting time resources and frequency resources used by the synchronization signal; or, the network listening format includes time resources and frequency resources and sequence resources used by the second base station to listen for synchronization signals;
  • the processor is specifically configured to: listen to the synchronization signal by using a network listening format of the second base station, where the synchronization signal is detected by the first base station according to the second base station Listening to the format, the first carrier is turned on in the same time resource as the network listening format of the second base station, according to the network listening format of the second base station, in the first carrier to the first The second base station transmits.
  • the second base station receives, by the first base station, a synchronization signal of the first carrier bearer synchronization signal configured by the first base station Format
  • the processor is specifically configured to: listen to the synchronization signal by using a network listening format with the same format as the synchronization signal according to the synchronization signal format, where the synchronization signal is by the first And the base station opens the first carrier according to the synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station, and according to the first carrier, according to the first carrier
  • the synchronization signal format carrying the synchronization signal is sent on the first carrier; wherein the synchronization signal format includes a time resource and a frequency resource used by the first base station to send a synchronization signal; or, the synchronization signal format includes A time resource and a frequency resource and a sequence resource used by the first base station to transmit the synchronization signal.
  • FIG. 2 is a schematic diagram of a method for shutting down a synchronous carrier in a multi-carrier scenario
  • FIG. 3 is a schematic flowchart of a method for synchronizing between stations according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of inter-station synchronization according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart diagram of another method for synchronizing between stations according to an embodiment of the present invention.
  • FIG. 6 is a schematic flow chart of another method for synchronization between stations according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a first base station according to an embodiment of the present invention
  • FIG. 8 is a schematic structural diagram of a second base station according to an embodiment of the present invention
  • FIG. 9 is a first base station according to an embodiment of the present invention
  • FIG. 10 is a schematic structural diagram of a second base station according to an embodiment of the present invention
  • FIG. 1 is a schematic structural diagram of an inter-station synchronization system according to an embodiment of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.
  • the method for inter-station synchronization provided by the embodiment of the present invention is applicable to synchronization between small cells, where a small cell base station is configured with multiple intra-band carriers or multiple inter-bands. Carriers. It can also be applied to a communication system in which synchronization is performed between any other type of cells. This embodiment of the present invention does not limit this, The embodiment of the invention is described by taking only the synchronization between small cells as an example.
  • FIG. 3 is a schematic flowchart of a method for synchronizing between stations according to an embodiment of the present invention. As shown in FIG. 3, the following steps may be included:
  • the first base station receives the indication information that is sent by the second base station, where the indication information includes an identifier of the second base station and an identifier of a listening carrier of the second base station listening for the synchronization signal, where the first base station
  • the second base station is opposite to the second base station.
  • the first base station is a base station that sends a synchronization signal to the second base station
  • the second base station is a base station that receives the synchronization signal through the network.
  • GSS S Global Navigation Satellite System
  • GPS Global Positioning System
  • wired network clock synchronization such as IEEE 1588 clock synchronization protocol, Ethernet clock synchronization protocol
  • synchronization signal provided by an external synchronization source such as a macro base station having a wired or wireless interface with a small cell base station, obtains clock synchronization, and The base station transmitting the synchronization signal to other small cell base stations
  • the synchronization signal is sent so that other small cells also implement clock synchronization, that is, inter-station synchronization;
  • a small cell base station may be a base station that transmits a synchronization signal, or may be a base station that receives a synchronization signal; wherein the clock synchronization includes time synchronization, Frequency synchronization.
  • the identifier of the second base station is a cell identity (ID) of the second base station, configured to enable the first base station to learn that the second base station maintains inter-station synchronization through the network and the first base station;
  • the listening carrier is a carrier that the second base station listens to the synchronization signal;
  • the listening carrier identifier is the listening carrier frequency point information of the second base station listening to the synchronization signal, and is used to enable the first base station to determine whether the first carrier to be closed is a carrier for transmitting a synchronization signal;
  • the synchronization signal is an inter-station synchronization signal, and may be represented by a Network Listening Reference Signal (NLRS);
  • the synchronization signal that is, the NLRS may be a Cell-specific Reference Signal (CRS), and a Channel State Information Reference Signal (CSI-RS), which is a Discovery Reference Signal (DRS).
  • the first base station may further receive the multi-carrier listening set sent by the second base station, so that the first base station selects a suitable carrier in the multi-carrier listening set as a carrier for transmitting the synchronization signal, where the multiple The carrier sense set is a set of carriers of the interception synchronization signal supported by the second base station.
  • PRS Positioning Reference Signal
  • MB SFN RS Multi-cast Single Frequency Network Reference Signal
  • the first base station may further receive the multi-carrier listening set sent by the second base station, so that the first base station selects a suitable carrier in the multi-carrier listening set as a carrier for transmitting the synchronization signal, where the multiple The carrier sense set is a set of carriers of the interception synchronization signal supported by the second base station.
  • the second base station transmits a synchronization signal.
  • the first carrier is a carrier that has been opened by any one of the carriers configured by the first base station; for example, because the coverage of the small cell base station is limited, the number of users serving the service is small, and the service fluctuation is relatively large, in the communication process,
  • the small cell base station may shut down a certain carrier that has been opened according to the service requirement, that is, stop the service data transmission on the carrier, thereby reducing interference to the surrounding base stations, or turning on a certain carrier, that is, turning on the transmitter on the carrier, in the carrier Business data transmission is carried out to adapt to the growing business needs.
  • the first base station may determine, according to various factors, that the first carrier is to be shut down, for example, according to the service load condition of the first base station, the interference of the data sent by the first carrier of the first base station to other base stations, and other base station pairs.
  • One or more of the interference situations of a base station determine that the first carrier is to be turned off; for example, when any one or more of the following conditions are met, the first base station may determine that the first carrier is to be turned off: the first base station is at the first The traffic load on the carrier is less than the first preset threshold;
  • the interference of the data sent by the first carrier of the first base station to other base stations is greater than a second preset threshold;
  • the interference of the other base station to the first base station on the first carrier is greater than a third preset threshold.
  • the first preset threshold, the second preset threshold, and the third preset threshold are thresholds that are set by the system or the first base station according to requirements or experience, which is not limited by the embodiment of the present invention.
  • the first base station determines, according to the interception carrier identifier in the indication information, whether the carrier of the first carrier to be closed and the carrier of the interception carrier are the same, where the carrier may be represented by a carrier frequency point, or may be used.
  • the first base station may continue to send the synchronization signal to the second base station according to the preset policy.
  • the first base station may continue to send the synchronization signal to the second base station by using the following two methods: the first base station sends a synchronization signal to the second base station on the second carrier; or the first base station reopens the first carrier to the second The base station transmits a synchronization signal.
  • the first base station sends a synchronization signal to the second base station on the second carrier; or the first base station reopens the first carrier to the second
  • the base station transmits a synchronization signal. The following are explained separately:
  • the first base station sends a synchronization signal to the second base station on the second carrier, where the second carrier is a carrier that sends the synchronization signal that is reselected by the first base station according to the need, or a multi-carrier that is fed back from the received second base station.
  • the multi-carrier configured by the first base station may be a multi-carrier configured by the second base station, in the embodiment of the present invention.
  • the subset of the multi-carriers configured by the second base station may not be limited in this embodiment of the present invention.
  • the second base station can be caused to detect the synchronization signal sent by the first base station on the configured carrier on the configured carrier. If the multi-carrier configured by the first base station is a superset of the multi-carrier configured by the second base station, the second base station is also The synchronization signal sent by the first base station may be received on the receiving carrier corresponding to the multiple carriers configured by the first base station.
  • the first base station may send information about the replacement of the interception carrier to the second base station, so that the second base station is in the second
  • the synchronization information of the interception carrier is the same as that of the interception carrier, wherein the information about the replacement of the interception carrier may be related information of the frequency of the interception carrier, and the information about the frequency of the interception carrier may be changed to notify the second base station to replace the detection.
  • Listening to the information of the carrier and the identifier of the second carrier or, including: notifying the second base station to replace the information of the interception carrier, the identifier of the second carrier, and the effective time of the second base station to replace the interception carrier; wherein, the identifier of the second carrier is The frequency information of the second carrier is either the frequency information of the second carrier and the system bandwidth information centered on the frequency of the second carrier; the effective time of the second base station to replace the listening carrier is the second base station starts and The time at which the synchronization signal is detected on the same carrier on the same carrier, or the second base station is on the same listening carrier as the second carrier.
  • the effective time of the second base station to replace the listening carrier may also be represented by the effective time of the first carrier being closed, wherein the effective time of the first carrier is closed may be the first carrier is disabled.
  • Time; the effective time of the second base station to replace the interception carrier may be one or more of a radio frame number index, a subframe number index, a slot number index, and an Orthogonal Frequency Divison Multiplexing (OFDM) symbol index.
  • SFN system frame number
  • the first base station can directly send the radio frame number index m, or the sub-index index n.
  • the #kth OFDM symbol of the frame starts, or starts from the #ith time slot of the #mth radio frame, or starts from the #jth OFDM of the #ith time slot of the #mth radio frame, Acquiring a synchronization signal on the same listening carrier as the second carrier; for example, if the SFNs of the first base station and the second base station are not aligned,
  • the first base station may send a radio frame number index, or a sub-frame number index, or a slot number index, or an Orthogonal Frequency Divison Multiplexing (OFDM) symbol index to notify the above information, and may also notify and An offset
  • the first base station may send, by means of a backhaul link, or an air interface signaling manner, or a UE-assisted manner, information about the frequency of the interception of the carrier frequency to the second base station; or, the first base station may replace the information
  • the related information of the listening carrier frequency point is sent to the central controller (coordinator), and then the information about the replacement listening carrier frequency point is sent to the second base station by the centralized controller; or the first base station may first replace the interception
  • the relevant information of the carrier frequency point is sent to the centralized controller (coordinator), and then the information about the replacement of the listening carrier frequency point is sent by the centralized controller to another centralized controller (coordinator), and then by the other one
  • the centralized controller sends the information about the frequency of the interception carrier to the second base station.
  • the method is applicable to the scenario where the first base station and the second base station are subordinate to different operators.
  • the first base station sends, by using a backhaul link, the related information of the frequency of the replacement listening carrier to the second base station: the first base station sends the correlation of the frequency of the replacement listening carrier to the second base station through the interface S 1 /X2 information.
  • the first base station sends, by means of the air interface information, the related information of the frequency of the replacement of the interception carrier to the second base station: the first base station adds the redundant information including the frequency of the interception of the carrier to the second carrier.
  • the base station sends information about the frequency of the replacement listening carrier, where the redundant information including the frequency of the replacement listening carrier can be carried in the NLRS;
  • the first base station sends a related information for replacing the carrier frequency point to the second base station by using another physical layer channel in the same time resource as the network listening format of the second base station on the first carrier.
  • the network listening format may include a time resource and a frequency resource used by the second base station to listen to the synchronization signal; or, the network listening format includes a time resource and a frequency resource used by the second base station to listen to the synchronization signal, and a sequence resource; It should be noted that, if the sequence resource is defined in advance by the first base station and the second base station according to requirements, the network listening format only includes the time resource and the frequency resource used by the second base station to listen for the synchronization signal; If the resource is not defined in the first base station and the second base station, the network listening format further includes a sequence resource. In the embodiment of the present invention, the network listening format and the time resource, the frequency resource, and the sequence resource used by the NLRS are used.
  • the time resource is one subframe (frame) or multiple subframes, or multiple consecutive OFDM symbols;
  • the frequency resource is one resource block, multiple resource blocks, multiple consecutive Or a discontinuous subcarrier (subcarrier), the time resource and frequency resource of the network listening format may also be a a plurality of resource elements (Resource Element);
  • the sequence resource is a sequence for transmitting an NLRS; wherein the sequence for transmitting the NLRS may be generated by a pseudo random sequence, or generated by a Zadoff-Chu sequence, or by
  • the time generating resource is the same as the network listening format of the second base station. If the first base station and the second base station are aligned, the time resource is the same as the network listening format.
  • the first base station sends, by using the reserved NLRS format, information about the replacement carrier frequency point to the second base station, so that the second base station detects whether the NLRS sent by the first base station on the first carrier is a reserved NLRS, Further, it is determined whether the carrier frequency point needs to be replaced.
  • the specific NLRS format corresponds to different carrier frequency points.
  • the first base station sends the replacement listening carrier frequency to the second base station in a UE-assisted manner.
  • the related information of the point is: Radio Resource Management (RRM) reported by the first base station by the user equipment (UE), quantity: Port: Reference Signal Receiving Power (RSRP), reference signal reception Quality of the first base station, the first base station needs to notify the second base station to change the listening carrier frequency point, and the first base station needs to notify the second base station to change the listening carrier frequency point.
  • RRM Radio Resource Management
  • UE user equipment
  • RSRP Reference Signal Receiving Power
  • the auxiliary UE Instructing the auxiliary UE to send a replacement signal to the second base station by using a fixed information format, so that the second base station parses the replacement signal by using a fixed information format to obtain information about replacing the interception carrier frequency point;
  • the fixed information format may be a system
  • the auxiliary UE, the first base station, and the second base station are known in a predefined manner, and the first base station may notify the centralized control by means of a backhaul link or air interface signaling or by first fixing a fixed information format.
  • the fixed information format is first notified to the centralized controller, and then the centralized controller notifies the other centralized controller, and then the other centralized controller notifies the second base station to learn;
  • the replacement signal is a signal containing related information for replacing the carrier frequency.
  • the indication information may further include a network listening format of the second base station, and correspondingly, the first base station may use the network detection with the second base station according to the network listening format of the second base station.
  • the synchronization signal format of the same format is transmitted to the second base station on the second carrier.
  • the first base station may send a synchronization signal to the second base station on the second carrier according to the synchronization signal format of the second carrier-bearing synchronization signal configured by the first base station; or, the first base station may be according to a centralized controller, for example A second carrier-synchronized signal synchronization signal format configured by an operation management and maintenance (OAM), a Mobility Management Entity (MME), or other configuration manner, and sent to the second base station on the second carrier Synchronization signal.
  • OAM operation management and maintenance
  • MME Mobility Management Entity
  • the synchronization signal format may include a time resource and a frequency resource used by the first base station to send the synchronization signal; or, the synchronization signal format includes a time resource and a frequency resource used by the first base station to send the synchronization signal, and a sequence resource;
  • the method further includes: the first base station transmitting, to the second base station, a synchronization signal format of the second carrier-bearing synchronization signal, so that the second base station detects the synchronization signal according to the synchronization signal format sent by the first base station, for example, synchronizing
  • the signal format can be included in the relevant information for replacing the carrier frequency.
  • the first base station re-opens the first carrier and sends the synchronization signal to the second base station.
  • the indication information may further include a network listening format of the second base station, and correspondingly, the first base station may be configured according to The network listening format of the second base station opens the first carrier in the same time resource as the network listening format of the second base station, and sends the synchronization to the second base station according to the network listening format of the second base station. signal.
  • the network listening format may include a time resource and a frequency resource used by the second base station to listen to the synchronization signal; or, the network listening format includes a time resource and a frequency resource used by the second base station to listen to the synchronization signal, and a sequence resource; It should be noted that, if the sequence resource is defined in advance by the first base station and the second base station according to requirements, the network listening format only includes the time resource and the frequency resource used by the second base station to listen for the synchronization signal; If the resource is not defined in the first base station and the second base station in advance, the network listening format further includes a sequence resource; wherein if the SFNs of the first base station and the second base station are aligned, the same time resource as the network listening format is Refers to the time resource of the first base station with the same SFN index and subframe index corresponding to the second base station network listening format; if the SFNs of the first base station and the second base station are not aligned, the same time resource as the network listening format is Means that
  • the first base station may open the first carrier in the same time resource as the synchronization signal format according to the synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station, and synchronize the synchronization signal according to the first carrier.
  • OAM Operaation administration and maintenance
  • MME Mobility Management Entity
  • a synchronization signal format of a first carrier that carries a synchronization signal configured in another configuration manner and will be first in the same time resource as the synchronization signal format
  • the carrier is turned on, and the synchronization signal is sent to the second base station on the first carrier according to the synchronization signal format of the first carrier carrying the synchronization signal.
  • the synchronization signal format may include a time resource and a frequency resource used by the first base station to transmit the synchronization signal; or, the synchronization signal format may include a time resource and a frequency resource used by the first base station to send the synchronization signal, and a sequence resource;
  • the resource is one subframe (frame) or multiple subframes, or multiple consecutive OFDM symbols;
  • the frequency resource is one resource block, multiple resource blocks, multiple consecutive or discontinuous subcarriers (subcarrier)
  • the time resource and the frequency resource of the synchronization signal format may also be one or more resource elements, where the sequence resource is a sequence for transmitting a synchronization signal, that is, an NLRS; wherein the transmitting NLRS is used
  • the sequence may be generated by a pseudo-random sequence, or generated by a Zadoff-Chu sequence, or generated by a machine generated sequence.
  • the synchronization signal format of the first carrier-carrying synchronization signal configured by the first base station is different from the synchronization signal format used when the synchronization signal is sent before the first carrier is turned off, that is, the first base station uses a new synchronization signal format, Before the first carrier is turned off and the first carrier is turned off, the first base station sends a synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station to the second base station, so that the second base station uses the same format as the synchronization signal.
  • the network listening format listens to the synchronization signal, or the first base station sends the synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station to the second base station and first before the first carrier is turned off and the first carrier is turned back on.
  • the effective time of the synchronization signal format configured by the base station where the effective time of the synchronization signal format configured by the first base station is the time when the first base station uses the reconfigured new synchronization signal format on the first carrier, or is the first base station Reconfiguring a new sync signal grid on the first carrier
  • the first base station may open the first carrier in the same time resource as the synchronization signal format according to the synchronization signal format before the first carrier is turned off, and on the first carrier according to the synchronization signal format.
  • the second base station transmits a synchronization signal.
  • the first base station passes the third carrier.
  • the method of the user equipment of the service further includes: configuring, by the first base station, a subframe corresponding to a time resource with the same network listening format or synchronization signal format as the MBSFN subframe or the restricted measurement set.
  • the first base station configures the time slot in the subframe corresponding to the time resource with the same network listening format or synchronization signal format as the guard interval on the third carrier; that is, relative to the third
  • the time resource on the third carrier that is the same as the network listening format or the synchronization signal format is configured as the time when the data is not sent to the UE.
  • the time resource that is the same as the network listening format or the synchronization signal format may be one or more determined subframes, where the guard interval is a plurality of consecutive or one of the one or more determined subframes.
  • the position of the discontinuous OFDM symbol is located; if the SFN of the first base station and the second base station are aligned, the time resource with the same network listening format refers to the network interception with the second base station. a format or a time resource of the first base station having the same SFN index and a subframe index corresponding to the first base station synchronization information format; if the SFNs of the first base station and the second base station are not aligned, the same time resource as the network listening format is The SFN index corresponding to the second base station network listening format has the SFN offset of the first base station and the second base station, and the time resource of the first base station with the same subframe index.
  • the third carrier is a carrier that sends information to the user equipment after the first carrier is turned off. It can be seen that, in a method for inter-station synchronization, the first base station receives the indication information sent by the second base station, where the indication information includes the second base. The identifier of the station and the identifier of the interception carrier of the second base station listening for the synchronization signal; if the first base station determines, according to the indication information, that the first carrier to be closed by the first base station is the same as the interception carrier, after the first carrier is turned off, according to The preset policy sends a synchronization signal to the second base station.
  • the second base station can implement inter-station synchronization without re-searching the synchronization source base station, which reduces the impact on the data transmission of the user equipment and reduces the network listening overhead.
  • the target base station is prevented from serving the user equipment in the process of re-searching for the new synchronization source base station, which has a great influence on the data transmission of the user equipment and increases the defect of the network listening overhead.
  • FIG. 4 is a schematic flowchart of a method for synchronizing between stations according to an embodiment of the present invention. As shown in FIG. 4, the following steps may be included:
  • the second base station selects the listening carrier and the first base station.
  • the second base station may select the listening carrier and the first base station according to various factors, for example, according to the received strength of the detected synchronization signal, the signal quality. Selecting a listening carrier and a first base station in one or more of a synchronization accuracy and a reliable synchronization state;
  • the second base station listens to the synchronization signal on the configured carrier, and determines the source base station corresponding to each carrier according to any one or more of the following conditions: the base station or the received signal strength that provides the maximum received signal strength is greater than the fourth pre- a base station with a threshold as a source base station; a base station that provides a received signal quality greater than a fifth preset threshold as a source base station; a base station that provides a synchronization accuracy greater than a sixth preset threshold as a source base station; and a base station that provides a reliable synchronization state
  • the fourth preset threshold, the fifth preset threshold, and the sixth preset threshold are threshold values that are set by the system according to requirements, which are not limited by the embodiment of the present invention; Receive power with reference signal ( Reference Signal Received Power, RSRP) to indicate; the received signal quality may be represented by a Reference Signal Received Quality (RSRQ); the synchronization accuracy may have a corresponding relationship with a synchronization level
  • the second base station may select one of the carriers as the listening carrier of the first base station according to one or more of the receiving strength, the signal quality, the synchronization precision, and the reliable synchronization state of the synchronization signal on each carrier, and simultaneously The source base station corresponding to the listening carrier is used as the first base station.
  • the second base station sends the indication information to the first base station, so that the first base station determines, according to the indication information, that the first carrier to be turned off by the first base station is the same as the interception carrier, and turns off the first carrier. And sending, to the second base station, the synchronization signal according to the preset policy, where the indication information includes an identifier of the second base station and an identifier of a listening carrier of the second base station listening for the synchronization signal; where the second base station
  • the indication information may be sent to the first base station by means of a backhaul link, or an air interface signaling manner, or a UE-assisted manner; or, the second base station first sends the indication information to the centralized controller, and then the centralized controller
  • the indication information is sent to the first base station; or the second base station may first send the indication information to the centralized controller, and then the centralized controller sends the indication information to another centralized controller, and then the other centralized group The controller sends the indication information to the first base station
  • the sending, by the second base station, the indication information to the first base station by using a backhaul link the second base station sends the indication information to the first base station by using the interface S 1 /X2; Sending, by the base station, the indication information to the first base station by using the air interface information, the second base station sending, by adding the redundant information, to the first base station Instructing, or the second base station sends the indication information to the first base station by using another physical layer channel in the same time resource as the network listening format of the second base station on the listening carrier;
  • the time resource is a subframe, or a plurality of consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols; the second base station sends the first base station in a UE-assisted manner.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the indication information is: Radio Resource Management (RRM) measurement reported by the second base station by the user equipment (UE), such as: Reference Signal Receiving Power (RSRP), reference signal reception quality (a reference signal receiving quality (RSRQ), selecting a UE located in the coverage of the first base station and located in the coverage of the second base station as a secondary UE, and sending, by the secondary UE, an indication to the first base station in a fixed information format Information, such that the first base station parses the indication information by using the fixed information format;
  • the fixed information format may be that the system learns the auxiliary UE and the first base station in a predefined manner, or may be the manner in which the second base station passes the backhaul link or the air interface message. In the manner of the command, the fixed information format is first notified to the centralized controller, and then the centralized controller notifies the second base station to notify the first base station to learn the same fixed information format as the auxiliary UE.
  • the embodiment of the invention does not limit this.
  • the second base station listens to the synchronization signal sent by the first base station according to the preset policy.
  • the second base station can listen to the synchronization signal sent by the first base station to the second base station on the second carrier on the same carrier as the second carrier frequency of the first base station.
  • the second base station after receiving the synchronization signal sent by the first base station to the second base station on the second carrier, on the same carrier as the second carrier frequency of the first base station, receiving the replacement listening carrier sent by the first base station
  • Two years The time of the wave and the effective time of the second base station to change the listening carrier; wherein, the effective time of the second base station to replace the listening carrier is the time when the second base station starts to listen to the synchronization signal on the same listening carrier as the second carrier; Or a period of time during which the second base station listens to the synchronization signal on the same listening carrier as the second carrier.
  • the indication information may further include a network listening format of the second base station, and correspondingly,
  • the second base station listens to the synchronization signal on the same carrier as the second carrier frequency of the first base station according to the network interception information format information of the second base station, where the synchronization signal is used by the first base station on the second carrier
  • the second base station transmits the same synchronous signal format in the same network listening format.
  • the information related to the frequency of the replacement listening carrier that is sent by the first base station that is received by the second base station further includes: a synchronization signal format of the second carrier carrying the synchronization signal, correspondingly,
  • the second base station may, according to the synchronization signal format of the second carrier-bearing synchronization signal, listen to the synchronization signal on the same carrier as the second carrier frequency of the first base station by using the same network listening format as the synchronization signal format.
  • the synchronization signal is sent by the first base station according to the synchronization signal format on the second carrier, and the synchronization signal format includes a time resource and a frequency resource used by the first base station to send the synchronization signal; or, the synchronization signal format includes the first base station sending synchronization. Time and frequency resources and sequence resources used by the signal.
  • the second base station may listen to the synchronization signal sent by the first base station to the second base station on the first carrier on the same carrier as the first carrier frequency of the first base station.
  • the indication information may further include a network listening format of the second base station, and correspondingly,
  • the second base station may listen to the synchronization signal in the same time resource as the network listening format of the second base station according to the network listening format of the second base station.
  • the synchronization signal is opened by the first base station according to the network interception format of the second base station, by opening the first carrier in the same time resource as the network listening format of the second base station, and the second base station of the first carrier
  • the network listening format is sent within the same time resource.
  • the information about the frequency of the replacement listening carrier transmitted by the first base station that is received by the second base station further includes a synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station, and correspondingly,
  • the second base station may use the network listening format of the same carrier synchronization format to detect the synchronization signal according to the synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station.
  • the synchronization signal is configured by the first base station according to the synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station, by opening the first carrier in the same time resource as the synchronization signal format, and carrying the synchronization signal according to the first carrier.
  • the synchronization signal format is transmitted on the first carrier; wherein, the synchronization signal format includes a time resource and a frequency resource used by the first base station to transmit the synchronization signal; or, the synchronization signal format includes a time resource used by the first base station to send the synchronization signal and Frequency resources and sequence resources.
  • the second base station may continue to listen to the first base station on the first carrier on the same carrier as the first carrier frequency of the first base station by using an existing network listening format. The synchronization signal transmitted by the second base station.
  • the synchronization signal is sent by the first base station according to the synchronization signal format before the first carrier is turned off, by opening the first carrier in the same time resource as the synchronization signal format, and transmitting on the first carrier by using the synchronization signal format.
  • the system makes the synchronization signal format of the first base station and the network listening format of the second base station the same in a predefined manner.
  • the embodiment of the present invention provides another method for inter-station synchronization, where the second base station selects a listening carrier and a first base station; and the second base station sends indication information to the first base station, so that the Determining, according to the indication information, that the first carrier to be turned off by the first base station is the same as the interception carrier, and after the first carrier is turned off, And sending, to the second base station, a synchronization signal according to a preset policy, where the indication information includes an identifier of the second base station and an identifier of a listening carrier of the second base station listening for a synchronization signal; Listening to the synchronization signal sent by the first base station according to a preset policy.
  • the second base station can implement inter-station synchronization without re-searching the synchronization source base station, which reduces the impact on the data transmission of the user equipment and reduces the network listening overhead.
  • the target base station is prevented from serving the user equipment in the process of re-searching for the new synchronization source base station, which has a great influence on the data transmission of the user equipment and increases the defect of the network listening overhead.
  • FIG. 5 is another method for synchronizing between stations according to an embodiment of the present invention. As shown in FIG. 5, the following steps may be included:
  • the second base station selects a listening carrier and a first base station
  • the second base station sends the indication information to the first base station, where the indication information includes an identifier of the second base station and an identifier of a listening carrier that the second base station listens to the synchronization signal;
  • the first base station determines that the first carrier is to be turned off
  • the first base station determines, according to the indication information, whether the first carrier to be closed is the same as the interception carrier. If the first carrier to be shut down is the same as the interception carrier, step 505 is performed; otherwise, Go to step 507;
  • the first base station sends, to the second base station, information related to the replacement of the carrier frequency, so that the second base station listens to the synchronization signal on the replaced listening carrier, where the information about the replacement carrier frequency includes the notification station.
  • the second base station replaces the information of the interception carrier and the identifier of the second carrier; or includes: informing the second base station to replace the information of the interception carrier, the identifier of the second carrier, and the second base station replacing the interception carrier time.
  • 506 After the first carrier is turned off, the first base station sends a synchronization signal to the second base station on the second carrier, and the second base station listens to the synchronization signal on the same listening carrier as the second carrier.
  • the indication information that is sent by the second base station to the first base station further includes a network listening format of the second base station, and correspondingly, the first base station may detect the network according to the second base station. a listening format, transmitting, by using the same synchronization signal format as the network listening format of the second base station, a synchronization signal to the second base station on the second carrier, where the second base station is the same as the second carrier Listening to the synchronization signal on the listening carrier;
  • the information about the replacement carrier channel sent by the first base station to the second base station further includes a synchronization signal format of the second carrier-bearing synchronization signal
  • the first base station may a synchronization signal format of the second carrier that carries the synchronization signal configured by the first base station, and a synchronization signal is sent to the second base station on the second carrier, where the second base station is the same as the second carrier
  • the interception carrier detects the synchronization signal in the same format as the synchronization signal of the synchronization signal of the second carrier-bearing synchronization signal.
  • the second base station selects the interception carrier and the first base station, and sends indication information to the first base station, where the first base station determines to be closed according to the indication information.
  • the first carrier is the same as the intercepting carrier, and sends information about the replacement carrier frequency to the second base station.
  • the first base station sends a synchronization signal to the second base station on the second carrier, where the second base station The synchronization signal is listened to on the same listening carrier as the second carrier.
  • FIG. 6 is another method for synchronizing between stations according to an embodiment of the present invention. As shown in FIG. 6, the method may include the following steps:
  • the second base station selects a listening carrier and a first base station
  • the second base station sends the indication information to the first base station, where the indication information includes an identifier of the second base station and an identifier of a interception carrier wave that the second base station listens to the synchronization signal;
  • the first base station determines that the first carrier is to be turned off
  • the first base station determines, according to the indication information, whether the first carrier to be closed is the same as the interception carrier. If the first carrier to be shut down is the same as the interception carrier, step 605 is performed; otherwise, Performing step 606;
  • the indication information sent by the second base station to the first base station further includes a network listening format of the second base station, and correspondingly, the first base station may be in accordance with the network listening format of the second base station, and the second The first carrier is turned on in the same time resource of the network listening format of the base station, and the synchronization signal is sent to the second base station in the first carrier according to the network listening format of the second base station, where the second base station is the same as the first carrier On the listening carrier, the network listening format is used to listen to the synchronization signal.
  • the first base station sends the synchronization signal format of the first carrier-carrier synchronization signal configured by the first base station to the second base station, and correspondingly, the first base station may carry the synchronization signal according to the first carrier configured by the first base station.
  • a synchronization signal format the first carrier is turned on within the same time resource as the synchronization signal format, and the second carrier is on the first carrier according to the synchronization signal format of the first carrier carrying the synchronization signal
  • the station sends a synchronization signal, and the second base station detects the synchronization signal on the same listening carrier as the first carrier by using the same network listening format as the configured synchronization signal format.
  • the first base station may open the first carrier in the same time resource as the synchronization signal format according to the synchronization signal format predefined by the system before the first carrier is turned off, and send the synchronization signal to the second base station on the first carrier.
  • the second base station continues to listen to the synchronization signal by using the system predefined network listening format on the same listening carrier as the first carrier.
  • the system synchronizes the synchronization signal format of the first base station with the network listening format of the second base station in a predefined manner before the first carrier is shut down.
  • the method further includes: configuring, by the first base station, a subframe corresponding to a time resource of the same format as the network listening format or the synchronization signal format on the third carrier as a multimedia broadcast single frequency network subframe or a restricted measurement set. Or the first base station configures a time slot in a subframe corresponding to a time resource of the same format as the network listening format or the synchronization signal format as a guard interval; wherein the third carrier is the first carrier that is off The carrier of the information is then transmitted to the user equipment, and the guard interval is a plurality of consecutive or discontinuous orthogonal frequency division multiplexing symbols.
  • the second base station selects the interception carrier and the first base station, and sends indication information to the first base station, where the first base station determines that the first carrier and the The listening carrier is the same. After the first carrier is turned off, the first carrier is re-opened, and the synchronization signal is sent on the first carrier. The second base station listens to the synchronization signal on the same listening carrier as the first carrier.
  • FIG. 7 is a schematic structural diagram of a first base station 70 according to an embodiment of the present invention.
  • the receiving unit 701 is configured to receive indication information sent by a second base station, where The indication information includes an identifier of the second base station and an identifier of the interception carrier of the second base station listening for the synchronization signal;
  • the identifier of the second base station is the identity of the second base station, and is used to enable the first base station 70 to learn to maintain synchronization with the second base station.
  • the listening carrier is the second.
  • the base station listens to the carrier of the synchronization signal;
  • the interception carrier identifier is the interception carrier frequency point information of the second base station listening for the synchronization signal, and is used to enable the first base station 70 to determine whether the first carrier to be closed is
  • the synchronization signal is an inter-station synchronization signal, which may be represented by a Network Listening Reference Signal (NLRS); wherein, the synchronization signal, that is, the NLRS may be a cell In the Cell-specific Reference Signal (CRS), the Channel State Information Reference Signal (CSI-RS), the Discovery Reference Signal (DRS), the Positioning Reference Signal , PRS), Multicast single frequency network reference signal (Multi-cast Single Frequency Network Refe Rence Signal , MB SFN
  • the first base station may further receive the multi-carrier listening set sent by the second base station, so that the first base station selects a suitable carrier in the multi-carrier listening set as a carrier for transmitting the synchronization signal, where the multiple The carrier sense set is a set of carriers of the interception synchronization signal supported by the second base station.
  • the sending unit 702 is configured to: if the first base station 70 determines, according to the indication information, that the first carrier to be turned off by the first base station 70 is the same as the interception carrier, after the first carrier is turned off, send a synchronization signal to the second base station according to the preset policy.
  • the first carrier is a carrier that has been opened by any one of the carriers configured by the first base station 70. For example, because the coverage of the small cell is limited, the number of users serving the service is small, and the service fluctuation is relatively large.
  • the small cell may close a certain carrier that has been turned on as needed, that is, stop the service data transmission on the carrier, thereby reducing interference to the surrounding base stations, or turning on a certain carrier, that is, turning on the transmitter on the carrier, performing on the carrier.
  • the first base station 70 may determine, according to various factors, that the first carrier is to be turned off, for example, according to the service load condition of the first base station 70, the interference of the data sent by the first carrier of the first base station 70 to other base stations, and the like.
  • the first base station 70 may determine that the first carrier is to be turned off: The traffic load of the first base station 70 on the first carrier is smaller than the first preset threshold; the interference of the data sent by the first carrier of the first base station 70 to other base stations is greater than a second preset threshold; The interference of a base station 70 is greater than a third predetermined threshold.
  • the first preset threshold, the second preset threshold, and the third preset threshold are thresholds that are set by the system according to requirements, which are not limited in this embodiment of the present invention.
  • the first base station 70 determines, according to the interception carrier identifier in the indication information, whether the carrier frequency of the first carrier to be turned off by the first base station is the same as the carrier frequency of the interception carrier; wherein the carrier can use the carrier frequency
  • the first base station 70 determines that the first carrier to be closed by the first base station is the same as the interception carrier, and indicates that the first base station is to be turned off according to the indication information.
  • the first carrier is a carrier that transmits a synchronization signal to other base stations.
  • the sending unit 702 may continue to send the synchronization signal to the second base station according to the preset policy. For example, the sending unit 702 may continue to send the synchronization signal to the second base station by: transmitting the synchronization signal to the second base station on the second carrier; or, re-opening the first carrier to send the synchronization signal to the second base station.
  • the following description is respectively made as follows: 1.
  • the synchronization signal is sent to the second base station on the second carrier, where the second carrier is the carrier that sends the synchronization signal that is reselected by the first base station 70 according to the need, or is sent from the received second base station.
  • the multi-carrier configured by the first base station may be the second base station, in the embodiment of the present invention.
  • the subset of the configured multi-carriers may also be a superset of the multi-carriers configured by the second base station, which is not limited in this embodiment of the present invention.
  • the second base station can be caused to detect the synchronization signal sent by the first base station on the configured carrier on the configured carrier. If the multi-carrier configured by the first base station is a super-set of the multi-carrier configured by the second base station, the second base station may also receive the synchronization signal sent by the first base station by using the receiving carrier corresponding to the multi-carrier configured by the first base station.
  • the sending unit 702 may send information about the frequency of the replacement listening carrier to the second base station, so that the second base station is in the Listening to the synchronization signal on the same listening carrier of the second carrier, wherein the information about the frequency of the interception of the interception carrier includes information for notifying the second base station to replace the interception carrier and the identifier of the second carrier; or The information of the interception carrier, the identifier of the second carrier, and the effective time of the second base station to replace the interception carrier; wherein the identifier of the second carrier is the frequency information of the second carrier; and the effective time of the second base station replacing the interception carrier The time when the second base station starts to listen to the synchronization signal on the same listening carrier as the second carrier, or the time period during which the second base station listens to the synchronization signal on the same listening carrier as the second carrier; In an example, the effective time of the second base station to replace
  • the first base station may directly send the radio frame number index m, or the sub-number index n, or Orthogonal Frequency Divison Multiplexing (OFDM) symbol index k, or slot number index i, or Orthogonal Frequency Divison Multiplexing (OFDM) symbol index j, notifying the second base station from #m radio frames start, or start from the #nth subframe of the #mth radio frame, or start from the #kth OFDM symbol of the #nth subframe of the #mth radio frame, or from the ## Starting at the #ith time slot of m radio frames, or starting from the #jth OFDM of the #ith time slot of the #mth radio frame, acquiring a synchronization signal on the same listening carrier as the second carrier For another example, if the first If the SFN of the base station and the second base station are not aligned, the first base station may directly send the radio frame number index m, or the sub-number index n, or Orthogonal Frequency Divison Multiplex
  • the sending unit 702 may send, to the second base station, related information for replacing the interception carrier frequency point by means of a backhaul link, or a manner of air interface signaling, or a UE-assisted manner;
  • the sending unit 702 may first send the related information of the frequency of the interception carrier to the central controller (coordinator), and then send the related information of the frequency of the interception carrier to the second base station by the centralized controller; or The sending unit 702 may first send the related information of the replacement listening carrier frequency point to the centralized controller (coordinator), and then the centralized controller sends the related information of the replacement listening carrier frequency point to another centralized controller (coordinator). And then, by the other centralized controller, the relevant information of the interception carrier frequency point is changed.
  • the method is applied to the second base station, where it should be noted that the manner is applicable to the scenario where the first base station and the second base station are subordinate to different operators.
  • the sending unit 702 sends the related information of the frequency of the replacement listening carrier to the second base station by means of the backhaul link: the first base station sends the correlation of the frequency of the replacement listening carrier to the second base station through the interface S 1 /X2 information;
  • the sending unit 702 sends, by using the air interface information, information about the frequency of the replacement listening carrier to the second base station: the first base station adds a second information to the second carrier by adding redundant information including the frequency of the interception carrier.
  • the base station sends relevant information for replacing the listening carrier frequency point;
  • the sending unit 702 sends related information of the replacement carrier frequency to the second base station by using other physical layer channels in the same time resource on the first carrier as the network listening format of the second base station;
  • the network listening format may include a time resource and a frequency resource used by the second base station to listen to the synchronization signal; or, the network listening format includes a time resource and a frequency resource used by the second base station to listen to the synchronization signal, and a sequence resource; It should be noted that, if the sequence resource is defined in advance by the first base station and the second base station according to requirements, the network listening format only includes the time resource and the frequency resource used by the second base station to listen for the synchronization signal; If the resource is not defined in the first base station and the second base station, the network listening format further includes a sequence resource. In the embodiment of the present invention, the network listening format and the time resource, the frequency resource, and the sequence resource used by the NLRS are used.
  • the time resource is one subframe (frame) or multiple subframes, or multiple consecutive OFDM symbols;
  • the frequency resource is one resource block, multiple resource blocks, multiple consecutive Or a discontinuous subcarrier (subcarrier), the time resource and frequency resource of the network listening format may also be a a plurality of resource elements (Resource Element);
  • the sequence resource is a sequence for transmitting an NLRS; wherein the sequence for transmitting the NLRS may be generated by a pseudo random sequence, or generated by a Zadoff-Chu sequence, or by The machine generated sequence is generated; wherein, the time resource on the first carrier that is the same as the network listening format of the second base station may be: if the first base station and the second base station are SFN pairs
  • the same time resource as the network listening format refers to the time resource of the first base station with the same SFN index and subframe index corresponding to the second base station network listening format; if the SFN of the first base station and the second base station are not Aligned, the same time resource as the network
  • the sending unit 702 sends, by using the reserved NLRS format, related information of the replacement carrier frequency point to the second base station, so that the second base station detects whether the NLRS sent by the first base station on the first carrier is a reserved NLRS, Further, it is determined whether the carrier frequency point needs to be replaced.
  • the specific NLRS format corresponds to different carrier frequency points.
  • the sending unit 702 sends the related information of the replacement carrier frequency to the second base station in a UE-assisted manner: the radio resource management (RRM) reported by the first base station by the user equipment (UE) is measured, and the port is: Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), selecting a UE located in the coverage of the first base station and located in the coverage of the second base station as the secondary UE, the secondary UE Transmitting, by using a fixed information format, a replacement signal to the second base station, so that the second base station parses the replacement signal by using a fixed information format to obtain information about replacing the carrier frequency point; wherein, the fixed information format may be that the system is pre-defined according to requirements.
  • the manner of the secondary UE and the second base station is known, or the first base station may notify the centralized controller by means of a backhaul link or air interface signaling, or notify the centralized controller of the fixed information format, and then notify the centralized controller. Notifying the second base station of the manner of the second base station; or, first, fixing the information
  • the format is notified to the centralized controller, and then notified by the centralized controller to another centralized controller, and then the other centralized controller notifies the second base station to learn, which is not limited by the embodiment of the present invention; A signal that replaces information about the carrier frequency.
  • the indication information may further include a network listening format of the second base station, corresponding,
  • the sending unit 702 is specifically configured to: send, according to a network listening format of the second base station, a synchronization signal to the second base station on the second carrier by using a synchronization signal format that is the same as the network listening format of the second base station.
  • the network listening format may include a time resource and a frequency resource used by the second base station to listen to the synchronization signal; or, the network listening format includes a time resource and a frequency resource used by the second base station to listen to the synchronization signal, and a sequence resource; It should be noted that, if the sequence resource is defined in advance by the first base station and the second base station according to requirements, the network listening format only includes the time resource and the frequency resource used by the second base station to listen for the synchronization signal; If the resource is not defined in the first base station and the second base station in advance, the network listening format further includes a sequence resource.
  • the first base station 70 sends a synchronization signal format of the second carrier-bearing synchronization signal to the second base station, correspondingly,
  • the sending unit 702 is further configured to: send a synchronization signal to the second base station on the second carrier according to the synchronization signal format of the second carrier-loaded synchronization signal configured by the first base station 70;
  • the second The carrier carries a synchronization signal format of the synchronization signal, and transmits a synchronization signal to the second base station on the second carrier.
  • the synchronization signal format may include a time resource and a frequency resource used by the first base station to transmit the synchronization signal; or, the synchronization signal format includes a time resource and a frequency resource used by the first base station to send the synchronization signal, and a sequence resource; wherein, the synchronization signal
  • the format can be included in the relevant information for replacing the carrier frequency.
  • the indication information may further include a network listening format of the second base station, and correspondingly, the sending unit 702 is specifically configured to: in a network listening format with the second base station according to a network listening format of the second base station The first carrier is turned on in the same time resource, and the synchronization signal is sent to the second base station in the first carrier according to the network listening format of the second base station.
  • the network listening format may include a time resource and a frequency resource used by the second base station to listen to the synchronization signal; or, the network listening format includes a time resource and a frequency resource used by the second base station to listen to the synchronization signal, and a sequence resource; It should be noted that, if the sequence resource is defined in advance by the first base station and the second base station according to requirements, the network listening format only includes the time resource and the frequency resource used by the second base station to listen for the synchronization signal; If the resource is not defined in the first base station and the second base station in advance, the network listening format further includes a sequence resource; wherein if the SFNs of the first base station and the second base station are aligned, the same time resource as the network listening format is Refers to the time resource of the first base station with the same SFN index and subframe index corresponding to the second base station network listening format; if the SFNs of the first base station and the second base station are not aligned, the same time resource as the network listening format is Means that
  • the sending unit 702 is further configured to: open the first carrier according to the synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station, in the same time resource as the synchronization signal format, according to the first carrier
  • the synchronization signal format of the synchronization signal transmits a synchronization signal to the second base station on the first carrier; or, according to a centralized controller, such as Operations administration and maintenance (OMM), a Mobility Management Entity (MME), Or the synchronization signal format of the first carrier that carries the synchronization signal configured by the other configuration mode, the first carrier is turned on in the same time resource as the synchronization signal format, and the synchronization signal format of the first carrier carrying the synchronization signal is on the first carrier.
  • OMM Operations administration and maintenance
  • MME Mobility Management Entity
  • the second base station transmits a synchronization signal.
  • the synchronization signal format includes the time when the first base station 70 sends the synchronization signal.
  • the synchronization signal format includes a time resource and a frequency resource used by the first base station 70 to send the synchronization signal, and a sequence resource;
  • the time resource is one subframe (frame) or multiple subframes, or multiple consecutive OFDM symbol;
  • the frequency resource is a resource block, a plurality of resource blocks, a plurality of consecutive or discontinuous subcarriers, and the time resource and the frequency resource of the synchronization signal format may also be one or more a resource element
  • the sequence resource is a sequence for transmitting a synchronization signal, that is, an NLRS; wherein the sequence for transmitting the NLRS may be generated by a pseudo-random sequence, or generated by a Zadoff-Chu sequence, Alternatively, it is generated by a machine generated sequence.
  • the synchronization signal format of the first carrier-carrying synchronization signal configured by the first base station is different from the synchronization signal format used when the synchronization signal is sent before the first carrier is turned off, that is, the first base station uses a new synchronization signal format
  • the sending unit 702 is further configured to send, to the second base station, a synchronization signal format of the first carrier-carrier synchronization signal configured by the first base station, so that the second base station uses the same format as the synchronization signal.
  • the network listening format listens to the synchronization signal, or the transmitting unit 702 sends the synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station to the second base station and the first base station before the first base station re-opens the first carrier.
  • the effective time of the configured synchronization signal format where the effective time of the synchronization signal format configured by the first base station is the time when the first base station uses the reconfigured new synchronization signal format on the first carrier; or is the first base station
  • the first carrier is used for a period of time with the reconfigured new sync signal format.
  • the sending unit 702 may open the first carrier in the same time resource as the synchronization signal format according to the synchronization signal format before the first carrier is turned off, and send synchronization to the second base station on the first carrier according to the synchronization signal format. signal. Further, if the first base station is configured with multiple carriers and can only open the transmitter on one carrier for data transmission at any time, in order to prevent the first base station from re-opening the first carrier, the first base station passes the third carrier.
  • the first base station 70 further includes:
  • the configuration unit 703 is configured to configure a subframe corresponding to a time resource of the third carrier with the same network listening format or synchronization signal format as a subframe other than the multimedia broadcast single frequency network subframe or the restricted measurement set, that is, For the third carrier service UE, the configuration unit 703 is configured to configure a time resource on the third carrier that is the same as the network listening format or the synchronization signal format to not send data to the UE; or, the third carrier is used.
  • the time slot in the subframe corresponding to the time resource of the network listening format or the synchronization signal format is configured as a guard interval.
  • the time resource of the network listening format or the synchronization signal format may be one or more.
  • the time resource with the same network listening format refers to the second base station network listening format or the first base station synchronization information.
  • the SFN index corresponding to the format has the SFN offset of the first base station and the second base station, and the time resource of the first base station with the same subframe index.
  • the third carrier is a carrier that the first base station sends information to the user equipment after the first carrier is turned off. It can be seen that, in the method for inter-station synchronization, the first base station 70 receives the indication information sent by the second base station, where the indication information includes the identifier of the second base station and the second base station interception synchronization. The first base station 70 determines that the first carrier to be turned off by the first base station 70 is the same as the interception carrier according to the indication information, and then sends the first carrier to the second base station according to a preset policy. Synchronization signal.
  • FIG. 8 is a schematic structural diagram of a second base station 80 according to an embodiment of the present invention. As shown in FIG.
  • the method may include: a selecting unit 801: configured to select a listening carrier and a first base station;
  • the unit 801 is specifically configured to: select the listening carrier and the first base station according to various factors, for example, according to the received strength of the detected synchronization signal, signal quality, synchronization accuracy, and one or more of the reliable synchronization states.
  • the selecting unit 801 detects the synchronization signal on the carrier capable of detecting the synchronization signal in the configured carrier, and determines the source corresponding to each carrier according to any one or more of the following cases:
  • the base station the base station that provides the maximum received signal strength or the base station whose received signal strength is greater than the fourth preset threshold is used as the source base station; and the base station that provides the received signal quality greater than the fifth preset threshold is used as the source base station; a base station of a sixth preset threshold as a source base station; a base station providing a reliable synchronization state as a source base station; wherein, the fourth The threshold value, the fifth preset threshold value, and the sixth preset threshold value are threshold values that are set by the system according to requirements, which are not limited by the embodiment of the present invention; the received signal strength may be received by the reference signal ( Reference Signal Received Power, RSRP) to indicate; the received signal quality may be represented by a Reference Signal Received Quality (RSRP)
  • the source base station is a second base A base station that provides a synchronization signal.
  • the selecting unit 801 may select one of the carriers as the listening carrier of the first base station according to one or more of the receiving strength, the signal quality, the synchronization precision, and the reliable synchronization state of the synchronization signal on each carrier, and simultaneously The source base station corresponding to the listening carrier is used as the first base station.
  • the sending unit 802 is configured to send the indication information to the first base station, so that the first base station determines, according to the indication information, that the first carrier to be closed by the first base station is the same as the interception carrier, After the first carrier is turned off, the synchronization signal is sent to the second base station 80 according to the preset policy, where the indication information includes the identifier of the second base station 80 and the second base station 80 detects the synchronization signal.
  • the sending unit 802 is specifically configured to: send the indication information to the first base station by means of a backhaul link, or a manner of air interface signaling, or a UE-assisted manner; or The sending unit 802 first sends the indication information to the centralized controller, and then sends the indication information to the first base station by the centralized controller.
  • the second base station may first send the indication information to the centralized controller, and then the centralized controller will The indication information is sent to another centralized controller, and then the indication information is sent to the first base station by the another centralized controller, wherein In this way, the manner is applicable to scenarios in which the first base station and the second base station are subordinate to different operators.
  • the sending unit 802 sends the indication information to the first base station by means of the backhaul link: the sending unit 802 sends the indication information to the first base station by using the interface S 1 /X2; The sending, by the sending unit 802, the indication information to the first base station by using the air interface information, the sending unit 802 sends the indication information to the first base station by adding the redundant information, or the sending unit 802 passes the detecting Listening to the other physical layer channel in the same time resource as the network listening format of the second base station on the carrier, sending the indication information to the first base station; where the time resource is a subframe (frame), or more Orthogonal Frequency Division Multiplexing (OFDM) symbols; The sending unit 802 sends the indication information to the first base station in a UE-assisted manner: the radio resource management (RRM) reported by the sending unit 802 by the user equipment (UE) is measured, : Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), selecting a UE located in the coverage
  • the format is notified to the centralized controller, and the first base station is notified by means of the centralized controller notifying the second base station.
  • UE preclude the use of the auxiliary information the same fixed format, embodiments of the present invention which is not limited; listening unit 803: the first base station for listening to a preset policy based on synchronization signals transmitted.
  • the listening unit 803 is specifically configured to: listen to the first base station on the second carrier to the second base station 80 on a carrier that is the same as the second carrier frequency of the first base station.
  • the second base station 80 receives the first base station before the intercepting unit 803 listens to the synchronization signal sent by the first base station to the second base station on the second carrier on the same carrier as the second carrier frequency of the first base station.
  • the information about the frequency of the replacement of the interception carrier is transmitted, and the information about the frequency of the replacement of the interception carrier includes information for notifying the second base station 80 to replace the interception carrier and the identifier of the second carrier; or
  • the second base station 80 replaces the information of the interception carrier, the identifier of the second carrier, and the effective time of the second base station 80 to replace the interception carrier.
  • the effective time of the second base station 80 to replace the interception carrier is The time at which the second base station 80 starts to listen to the synchronization signal on the same listening carrier as the second carrier; or the second base station is in the same listening carrier as the second carrier A period of time on which to listen to the sync signal.
  • the indication information may further include a network listening format of the second base station 80.
  • the listening unit 803 is further configured to: according to the network listening information format information of the second base station 80, Listening to the synchronization signal on a carrier of the first base station with the same second carrier frequency point, wherein the synchronization signal is used by the first base station on the second carrier to detect the network with the second base station 80 Send in the same sync signal format as the listening format.
  • the information related to the frequency of the replacement of the interception carrier transmitted by the first base station received by the second base station 80 further includes: a synchronization signal format of the second carrier carrying the synchronization signal, correspondingly,
  • the listening unit 803 is further configured to: use, according to the synchronization signal format of the second carrier-bearing synchronization signal, on the same carrier as the second carrier frequency of the first base station, use the same format as the synchronization signal
  • the network listening format listens to the synchronization signal.
  • the synchronization signal is sent by the first base station on the second carrier according to the synchronization signal format, and the synchronization signal format includes a time resource and a frequency resource used by the first base station to send a synchronization signal.
  • the synchronization signal format includes a time resource and a frequency resource used by the first base station to send a synchronization signal, and a sequence resource.
  • the listening unit 803 is further configured to: listen to, on a carrier that is the same as the first carrier frequency of the first base station, a synchronization signal that is sent by the first base station to the second base station on the first carrier. .
  • the indication information may further include a network listening format of the second base station 80.
  • the listening unit 803 is specifically configured to: according to the network listening format of the second base station 80, The second base station 80 listens to the same time resource in the same network listening format. Step signal.
  • the synchronization signal is used by the first base station to pass the first carrier in the same time resource as the network listening format of the second base station 80 according to the network listening format of the second base station 80. Turning on, transmitting in the same time resource of the first carrier as the network listening format of the second base station 80.
  • the information about the frequency of the replacement listening carrier that is sent by the first base station is further related to the synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station, and correspondingly, the listening unit 803
  • the method is further configured to: use, according to the synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station by using the first base station, to use a network interception format interception mode with the same format as the synchronization signal Said synchronization signal.
  • the synchronization signal is configured by the first base station according to a synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station, by using the same time resource as the synchronization signal format.
  • a carrier is turned on, and is sent on the first carrier according to a synchronization signal format of the first carrier carrying a synchronization signal; where the synchronization signal format includes a time resource and a frequency used by the first base station to send a synchronization signal
  • the synchronization signal format includes a time resource and a frequency resource used by the first base station to send a synchronization signal, and a sequence resource.
  • the intercepting unit 803 is further configured to: continue to listen to the first base station on the first carrier that is the same as the first carrier frequency of the first base station by using an existing network listening format. A synchronization signal transmitted to the second base station on a carrier.
  • the synchronization signal is sent by the first base station according to the synchronization signal format before the first carrier is turned off, by opening the first carrier in the same time resource as the synchronization signal format, and transmitting on the first carrier by using the synchronization signal format.
  • the system makes the synchronization signal format of the first base station and the network listening format of the second base station the same in a predefined manner.
  • the embodiment of the present invention provides a second base station 80, which selects a listening carrier and a first base station; and sends indication information to the first base station, so that the first base station determines the The first carrier to be closed by the first base station is the same as the interception carrier, and after the first carrier is turned off, the synchronization signal is sent to the second base station 80 according to a preset policy, where the indication information includes the The identifier of the second base station 80 and the identifier of the interception carrier that the second base station 80 listens to the synchronization signal; the second base station 80 listens to the synchronization signal sent by the first base station according to the preset policy.
  • FIG. 9 is a schematic structural diagram of a first base station 90 according to an embodiment of the present invention. As shown in FIG. 9, the device includes: a processor 901, a memory 902, a communication unit 903, and at least one communication bus 904.
  • the processor 901 may be a central processing unit (CPU); the memory 902 may be a volatile memory, for example Random access memory (English: random - access memory, abbreviation: RAM); or non-volatile memory (English: non-volatile memory), such as read-only memory (English: read-only memory, abbreviation: ROM), fast Flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or solid state drive (English: solid-state drive, abbreviation: SSD); or a combination of the above types of memory, and to the processor 1001 Provide instructions and data;
  • RAM random - access memory
  • non-volatile memory English: non-volatile memory
  • read-only memory English: read-only memory, abbreviation: ROM
  • fast Flash memory English: flash memory
  • hard disk English: hard disk drive, abbreviation: HDD
  • SSD solid state drive
  • the communication unit 903 is configured to perform data transmission with an external network element.
  • the communication unit 903 is configured to receive indication information sent by the second base station, where
  • the indication information includes an identifier of the second base station and an identifier of the interception carrier of the second base station listening for the synchronization signal;
  • the identifier of the second base station is the identity of the second base station.
  • the synchronization signal may be represented by a Network Listening Reference Signal (NLRS), where the synchronization signal, that is, the NLRS may be a Cell-specific Reference Signal (CRS), channel state information.
  • NLRS Network Listening Reference Signal
  • CRS Cell-specific Reference Signal
  • the communication unit 903 may further receive the multi-carrier listening set sent by the second base station, so that the first base station selects a suitable carrier in the multi-carrier listening set as a carrier for transmitting the synchronization signal, where the multiple The carrier sense set is a set of carriers of the interception synchronization signal supported by the second base station.
  • the processor 901 is configured to: determine, according to the indication information, that the first carrier to be turned off by the processor 901 is the same as the interception carrier, and after the first carrier is turned off, to the second base station according to a preset policy. Send a sync signal.
  • the first carrier is a carrier that has been opened by any one of the carriers configured by the processor 901; for example, because the coverage of the small cell is limited, the number of users of the service is small, and the service fluctuation is relatively large, in the communication process, small
  • the community may be shut down as needed When a certain carrier is turned on, the service data transmission is stopped on the carrier, thereby reducing the interference to the surrounding base stations, or opening a certain carrier, that is, turning on the transmitter on the carrier, and performing service data transmission on the carrier, thereby adapting to the growth. Business needs.
  • the processor 901 can determine the first carrier to be turned off according to various factors, for example, the interference of the data sent by the first carrier of the first base station 90 to other base stations according to the service load condition of the first base station 90, and other base stations. Determining, by one or more of the interference conditions of the first base station 90, the first carrier to be turned off; for example, when any one or more of the following conditions are met, the processor 901 may determine that the first carrier is to be turned off: the first base station The traffic load on the first carrier is less than the first preset threshold; the interference between the first carrier and the other carriers of the first base station 90 is greater than a second preset threshold;
  • the interference of the other base stations to the first base station 90 on the first carrier is greater than a third preset threshold.
  • the first preset threshold, the second preset threshold, and the third preset threshold are thresholds that are set by the system according to requirements, which are not limited in this embodiment of the present invention.
  • the processor 901 determines, according to the interception carrier identifier in the indication information, whether the carrier frequency of the first carrier to be turned off by the first base station 90 is the same as the carrier frequency of the interception carrier; wherein the carrier can use the carrier frequency
  • the indication may also be represented by a carrier frequency point and a system bandwidth centered at the carrier frequency point; if the processor 901 determines, according to the indication information, that the first carrier to be turned off by the first base station 90 is the same as the interception carrier, indicating that the signal is to be turned off.
  • the first carrier is a carrier that transmits a synchronization signal to other base stations.
  • the synchronization signal may continue to be sent to the second base station according to a preset policy.
  • the processor 901 may continue to send the synchronization signal to the second base station by using the following two methods: The processor 901 sends a synchronization signal to the second base station on the second carrier; or, the processor 901 reopens the first carrier to the second The base station transmits a synchronization signal.
  • the following description is respectively made as follows: 1.
  • the second carrier is a carrier that sends the synchronization signal that is reselected by the first base station according to requirements or from the received station.
  • the carrier of the transmission synchronization signal that is reselected in the multi-carrier listening set sent by the second base station is not limited in this embodiment of the present invention.
  • the multi-carrier configured by the first base station is used. It may be a subset of the multi-carriers configured by the second base station, or may be a super-set of the multi-carriers configured by the second base station, which is not limited in this embodiment of the present invention.
  • the second base station can be caused to detect the synchronization signal sent by the first base station on the configured carrier on the configured carrier. If the multi-carrier configured by the first base station is a super-set of the multi-carrier configured by the second base station, the second base station may also receive the synchronization signal sent by the first base station by using the receiving carrier corresponding to the multi-carrier configured by the first base station.
  • the communication unit 903 sends the related information of the frequency of the replacement listening carrier to the second base station, so that the second The base station listens to the synchronization signal on the same listening carrier as the second carrier, where the information about the frequency of the replacement of the interception carrier includes information for notifying the second base station to replace the interception carrier and the second carrier.
  • the information that is used to notify the second base station to replace the interception carrier, the identifier of the second carrier, and the effective time of the second base station to replace the interception carrier where the identifier of the second carrier is the Frequency information of the second carrier;
  • the effective time of the second base station to replace the listening carrier is the time when the second base station starts to listen to the synchronization signal on the same listening carrier as the second carrier, or is the second time The base station listens to the synchronization signal for a period of time on the same listening carrier as the second carrier.
  • the effective time of the second base station to replace the interception carrier can be used.
  • the effective time of the first carrier is turned off wherein the effective time of the first carrier is off is the time when the first carrier is turned off; and the effective time of the second base station to replace the listening carrier can be indexed by the wireless frame number, Frame number index, slot number index, orthogonal frequency division multiplexing (Orthogonal Frequency Divison) Multiplexing, OFDM)
  • One or more of the symbol indexes indicate, for example, if the system frame number (SFN) of the first base station and the second base station are synchronized or aligned, the first base station can directly transmit the wireless Frame number index m, or sub-index n, or Orthogonal Frequency Divison Multiplexing (OFDM) symbol index k, or slot number index i, or Orthogonal Frequency Divison Multiplexing , OFDM) symbol index j, notifying the second base station to start from the #mth radio frame, or from the #nth subframe of the #mth radio frame, or from the #nth subframe of the #mth radio
  • Orthogonal frequency division multiplexing or orthogonal frequency division multiplexing (Orthogo The nal frequency Divison Multiplexing (OFDM) symbol index notifies the above information, and may also notify the offset between the first base station and the second base station SFN, so that the second base station learns the effective time of the second base station to change the interception carrier. .
  • OFDM Orthogonal frequency division multiplexing
  • the communication unit 903 may send, by using a manner of a backhaul link, or an air interface signaling manner, or a UE-assisted manner, information about the frequency of the interception of the carrier frequency to the second base station; or, the communication unit 903 may first Transmitting the information about the frequency of the interception carrier to the centralized controller (coordinator), and then transmitting, by the centralized controller, the information about the frequency of the replacement of the carrier frequency to the second base station; or, the communication unit 903 may replace the information
  • the related information of the listening carrier frequency point is sent to the centralized controller (coordinator), and then the centralized controller sends the related information of the replacement listening carrier frequency point to another centralized controller (coordinator), and then The other centralized controller sends the information about the frequency of the interception carrier to the second base station.
  • the method is applicable to the scenario where the first base station and the second base station are subordinate to different operators.
  • the information that the communication unit 903 sends to the second base station by using the backhaul link to change the frequency of the interception carrier carrier is: the first base station sends the information to the second base station through the interface S 1 /X2 And the information about the frequency of the interception of the carrier frequency is sent to the second base station by using the air interface information: the communication unit 903 passes the first carrier. And transmitting, to the second base station, related information for replacing the interception carrier frequency point, by adding redundant information including replacing the interception carrier frequency point;
  • the communication unit 903 sends related information of the replacement carrier frequency to the second base station by using other physical layer channels in the same time resource on the first carrier as the network listening format of the second base station;
  • the network listening format may include a time resource and a frequency resource used by the second base station to listen to the synchronization signal; or, the network listening format includes a time resource and a frequency resource used by the second base station to listen to the synchronization signal, and a sequence resource; It should be noted that, if the sequence resource is defined in advance by the first base station and the second base station according to requirements, the network listening format only includes the time resource and the frequency resource used by the second base station to listen for the synchronization signal; If the resource is not defined in the first base station and the second base station, the network listening format further includes a sequence resource. In the embodiment of the present invention, the network listening format and the time resource, the frequency resource, and the sequence resource used by the NLRS are used.
  • the time resource is one subframe (frame) or multiple subframes, or multiple consecutive OFDM symbols;
  • the frequency resource is one resource block, multiple resource blocks, multiple consecutive Or a discontinuous subcarrier (subcarrier), the time resource and frequency resource of the network listening format may also be a a plurality of resource elements (Resource Element);
  • the sequence resource is a sequence for transmitting an NLRS; wherein the sequence for transmitting the NLRS may be generated by a pseudo random sequence, or generated by a Zadoff-Chu sequence, or by
  • the time generating resource is the same as the network listening format of the second base station. If the first base station and the second base station are aligned, the time resource is the same as the network listening format.
  • the communication unit 903 sends the related information of the replacement carrier frequency point to the second base station by using the reserved NLRS format, so that the second base station detects whether the NLRS sent by the first base station on the first carrier is the reserved NLRS, Further, it is determined whether the carrier frequency point needs to be replaced.
  • the communication unit 903 sends the related information of the replacement carrier frequency to the second base station in a UE-assisted manner: the radio resource management (RRM) measurement reported by the communication unit 903 by the user equipment (UE)
  • RRM radio resource management
  • the quantity such as: Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), is selected to be located in the coverage of the first base station and located in the coverage of the second base station.
  • RSRP Reference Signal Receiving Power
  • RSRQ Reference Signal Receiving Quality
  • the UE serves as a secondary UE, and the secondary UE sends a replacement signal to the second base station by using a fixed information format, so that the second base station parses the replacement signal by using the fixed information format to obtain a replacement carrier frequency point.
  • the fixed information format may be that the system learns the secondary UE and the second base station in a predefined manner, or may be the manner in which the first base station passes the backhaul link.
  • the method of the air interface signaling, or the fixed information format is first notified to the centralized controller, and then the centralized controller notifies the second base station to notify the second base station to obtain the same fixed information format as the auxiliary UE;
  • the fixed information format is first notified to the centralized controller, and then the centralized controller notifies the other centralized controller, and then the another centralized controller notifies the second base station to learn the same fixed as the auxiliary UE.
  • the information format of the present invention is not limited by the embodiment of the present invention; the replacement signal is a letter including related information for replacing a carrier frequency point.
  • the indication information may further comprise a second base station network listener format
  • the corresponding processor 901 is specifically configured to: use the same synchronization signal format as the network listening format of the second base station to perform the second on the second carrier according to the network listening format of the second base station
  • the base station sends a synchronization signal, where the network listening format includes a time resource and a frequency resource used by the second base station to listen to the synchronization signal; or the network listening format includes the second base station listening synchronization signal
  • the time resource and the frequency resource and the sequence resource are used; wherein, if the sequence resource is defined in advance by the system in the first base station and the second base station, the network resource is detected.
  • the format includes only the time resource and the frequency resource used by the second base station to listen to the synchronization signal; if the sequence resource is not defined in the first base station and the second base station, the network listening format is It also contains sequence resources.
  • the first base station 90 sends a synchronization signal format of the second carrier bearer synchronization signal to the second base station, correspondingly,
  • the processor 901 is further configured to: send a synchronization signal to the second base station on the second carrier according to a synchronization signal format of the second carrier-bearing synchronization signal configured by the first base station; or, first
  • the base station can be configured according to a centralized controller, such as an operation management and maintenance (OAM), a Mobility Management Entity (MME), or another configuration mode, and the first carrier carries a synchronization signal synchronization signal format. Sending a synchronization signal to the second base station on the second carrier.
  • OAM operation management and maintenance
  • MME Mobility Management Entity
  • the synchronization signal format includes a time resource and a frequency resource used by the first base station to send a synchronization signal; or, the synchronization signal format includes a time resource and a frequency resource used by the first base station to send a synchronization signal, and The sequence resource; wherein, the synchronization signal format may be included in the related information of the replacement carrier frequency point for transmission.
  • the re-opening of the first carrier to send the synchronization signal to the second base station is exemplary.
  • the indication information may further include a network listening format of the second base station.
  • the processor 901 is specifically configured to: a network listening format of the second base station, where the first carrier is opened in a time resource that is the same as a network listening format of the second base station, according to a network listening format of the second base station, The first carrier transmits a synchronization signal to the second base station.
  • the network listening format may include a time resource and a frequency resource used by the second base station to listen to the synchronization signal; or the network listening format includes a time for the second base station to listen to the synchronization signal.
  • the network listening format includes only a time resource and a frequency resource used by the second base station to listen to the synchronization signal; if the sequence resource is not defined in the first base station and the second base station, the network listening format further includes a sequence resource. .
  • the processor 901 is further configured to: according to the synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station 90, the first carrier in a same time resource as the synchronization signal format Opening, transmitting, according to the synchronization signal format of the first carrier-bearing synchronization signal, a synchronization signal to the second base station on the first carrier.
  • the synchronization signal format includes a time resource and a frequency resource used by the first base station 90 to transmit a synchronization signal.
  • the synchronization signal format includes a time resource and a frequency used by the first base station 90 to send a synchronization signal.
  • the same time resource as the network listening format refers to the same SFN index and subframe index corresponding to the second base station network listening format.
  • the time resource of a base station; if the SFNs of the first base station and the second base station are not aligned, the time resource with the same network listening format means that the SFN index corresponding to the second base station network listening format has the first base station and the second SFN offset of the base station, subframe index phase The same time resource of the first base station.
  • the processor 901 is further configured to: open, according to a synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station, to start the first carrier in the same time resource as the synchronization signal format, according to the first carrier
  • the synchronization signal format of the synchronization signal transmits a synchronization signal to the second base station on the first carrier; or, according to a centralized controller, such as Operations administration and maintenance (OMM), a Mobility Management Entity (MME), Or the synchronization signal format of the first carrier that carries the synchronization signal configured by the other configuration mode, the first carrier is turned on in the same time resource as the synchronization signal format, and the synchronization signal format of the first carrier carrying the synchronization signal is on the first carrier.
  • OMM Operations administration and maintenance
  • MME Mobility Management Entity
  • the second base station transmits a synchronization signal.
  • the synchronization signal format includes a time resource and a frequency resource used by the first base station to transmit the synchronization signal; or, the synchronization signal format includes a time resource and a frequency resource used by the first base station to send the synchronization signal, and a sequence resource; One subframe (frame) or multiple subframes, or multiple consecutive OFDM symbols; the frequency resource is one resource block, multiple resource blocks, multiple consecutive or discontinuous subcarriers,
  • the time resource and the frequency resource of the synchronization signal format may also be one or more resource elements, where the sequence resource is a sequence for transmitting a synchronization signal, that is, an NLRS; wherein the sequence for transmitting the NLRS may be Generated from a pseudo-random sequence, or generated by a Zadoff-Chu sequence, or generated by a machine-generated sequence.
  • the synchronization signal format of the first carrier that carries the synchronization signal configured by the first base station 90 is different from the synchronization signal format used when the synchronization signal is sent before the first carrier is turned off, that is, the first base station uses a new synchronization signal format.
  • the communication unit 903 is further configured to send, to the second base station, a synchronization signal format of the first carrier-carrier synchronization signal configured by the first base station 90, so that the second base station is used and synchronized.
  • the network listening format with the same signal format listens to the synchronization signal, or the first base station 90 sends the first base station 90 to the second base station before re-opening the first carrier.
  • the effective time of the synchronization signal format configured by the first base station 90 is the time when the first base station uses the reconfigured new synchronization signal format on the first carrier; or is the first The base station uses the reconfigured new synchronization signal format for a period of time on the first carrier.
  • the processor 901 is further configured to: open the first carrier in the same time resource as the synchronization signal format according to the synchronization signal format before the first carrier is turned off, and on the first carrier according to the synchronization signal format.
  • the second base station transmits a synchronization signal.
  • the system synchronizes the format of the synchronization signal used by the first base station 90 with the network listening format used by the second base station in a predefined manner before the first carrier is turned off.
  • the second base station still listens to the carrier wave using the network listening format before the first carrier is turned off. Further, if the first base station 90 is configured with multiple carriers and can only open the transmitter on one carrier for data transmission at any time, in order to prevent the first base station 90 from re-opening the first carrier, the first base station 90 passes The effect of the user equipment of the third carrier service, the processor 901 is further configured to:
  • the configuration unit 703 is configured to configure a time resource on the third carrier that is the same as the network listening format or the synchronization signal format as a time when the data is not sent to the UE.
  • the network listening format or synchronization signal format on the third carrier as a guard interval; wherein, the network listening format or synchronization
  • the time resource with the same signal format may be one or more determined subframes, where the guard interval is a plurality of consecutive or discontinuous orthogonal frequency division multiplexing symbols in the one or more determined subframes.
  • the index has the SFN offset of the first base station and the second base station, and the time resource of the first base station with the same subframe index.
  • the third carrier is a carrier that the first base station sends information to the user equipment after the first carrier is turned off.
  • the first base station 90 receives the indication information sent by the second base station, where the indication information includes the identifier of the second base station and the second The base station detects the identifier of the interception carrier of the synchronization signal; if the first base station 90 determines, according to the indication information, that the first carrier to be closed by the first base station is the same as the interception carrier, the first After the carrier is turned off, the synchronization signal is sent to the second base station according to a preset policy.
  • FIG. 10 is a schematic structural diagram of another second base station 100 according to an embodiment of the present invention. As shown in FIG. 10, the apparatus includes: a processor 1001, a memory 1002, a communication unit 1003, and at least one communication bus 1004.
  • the processor 1001 may be a central processing unit (English: central processing unit, abbreviated as CPU); the memory 1002 may be a volatile memory (English: volatile memory).
  • volatile memory For example, random access memory (English: random - access memory, abbreviation: RAM); or non-volatile memory (English: non-volatile memory), such as read-only memory (English: read-only memory, abbreviation: ROM), Flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or solid state drive (English: solid-state drive, abbreviation: S SD); or a combination of the above types of memory, and processing
  • the unit 1001 provides instructions and data; and the communication unit 1003 is configured to perform data transmission with an external network element.
  • the processor 1001 is configured to: select a listening carrier and a first base station; Preferably, the processor 1001 is specifically configured to: select a listening carrier and a first base station according to multiple factors, for example, according to the detected synchronization signal Selecting the listening carrier and the first base station in one or more of the receiving strength, the signal quality, the synchronization accuracy, and the reliable synchronization state; for example, the carrier of the second base station 100 capable of detecting the synchronization signal in the configured carrier Detecting the synchronization signal, determining the source base station corresponding to each carrier according to any one or more of the following conditions: the base station providing the maximum received signal strength or the base station receiving the signal strength greater than the fourth preset threshold as the source base station; a base station whose received signal quality is greater than a fifth preset threshold is used as a source base station; a base station that provides a synchronization accuracy greater than a sixth preset threshold is used as a source base station; and a base station that provides a reliable synchronization state is used
  • the synchronization precision may have a corresponding relationship with the synchronization level, so that the first base station can determine the source base station by the synchronization level.
  • a smaller synchronization level represents a higher synchronization Degree, or a larger synchronization level represents higher synchronization accuracy;
  • the source base station is a processor
  • a base station providing a synchronization signal wherein the synchronization signal may be included in a Common Reference Signal (CRS), or a Channel State Information Reference Signal (CSI-RS), or a positioning reference signal (Positioning Reference Signal, PRS), or Multimedia Broadcast Multicast Service (MBMS RS), or Discovery Reference Signal (DRS), or Primary Synchronization Signal (PS) In S), or in a Secondary Synchronization Signal (SSS), or other signal that can provide a synchronization signal; further, the processor 1001 according to the reception strength of the synchronization signal on each carrier, the signal quality, One or more of the synchronization accuracy and the reliable synchronization state select one of the carriers as the listening carrier of the first base station, and the source base station corresponding to the listening carrier as the first base station.
  • CRS Common Reference Signal
  • CSI-RS Channel State Information Reference Signal
  • PRS Positioning Reference Signal
  • MBMS RS Multimedia Broadcast Multicast Service
  • DRS Discovery Reference Signal
  • PS Primary Synchronization Signal
  • the communication unit 1003 is configured to: send the indication information to the first base station, so that the first base station determines, according to the indication information, that the first carrier to be closed by the first base station is the same as the interception carrier After the first carrier is turned off, the synchronization signal is sent to the second base station according to a preset policy, where the indication information includes an identifier of the second base station and a detection of the synchronization signal of the second base station.
  • the communication unit 1003 may send the indication information to the first base station by means of a backhaul link, or an air interface signaling manner, or a UE-assisted manner; or, the communication unit 1003 first indicates the indication information.
  • the communication unit 1003 may first send the indication information to the centralized controller, and then the centralized controller sends the indication information to another centralized set. The controller then sends the indication information to the first base station by the another centralized controller, where This method is applicable to the first and second base stations belong to different operators of the scene.
  • the transmitting unit 1003 sends the indication information to the first base station by means of the air interface information: the communication unit 1003 sends the indication information to the first base station by adding redundant information, or the communication unit 1003 Transmitting the indication information to the first base station by using another physical layer channel in the same time resource as the network listening format of the second base station, where the time resource is one subframe (subframe) Or the Orthogonal Frequency Division Multiplexing (OFDM) symbol; the communication unit 1003 sends the indication information to the first base station in a UE-assisted manner: the processor 1001 passes Radio Resource Management (RRM) reported by the user equipment (UE), quantity: Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), Selecting to be located in the coverage of the first base station and located in the coverage of the second base station a range of UEs as a secondary UE, wherein the secondary UE sends the indication information to the first base station in a fixed information format, so that the first base station parses the indication information by using
  • the processor 1001 is further configured to: listen to the synchronization signal sent by the first base station according to a preset policy.
  • the processor 1001 is specifically configured to: listen to the first on a carrier that is the same as the second carrier frequency of the first base station a synchronization signal sent by the base station to the second base station 100 on the second carrier; wherein, the second base station listens to the first base station on a carrier that is the same as the second carrier frequency of the first base station
  • the processor 1001 is further configured to receive, by the first base station, information related to the frequency of the replacement of the interception carrier, where the frequency of the interception of the carrier frequency is changed, before the synchronization signal is sent to the second base station on the second carrier.
  • the information about the second base station is used to notify the second base station to change the information of the interception carrier and the identifier of the second carrier.
  • the information about the second base station is used to notify the second base station to replace the interception carrier, the identifier of the second carrier, and the second base station are replaced.
  • the effective time of the interception carrier is: the time when the second base station changes the listening carrier is the time when the second base station starts to listen to the synchronization signal on the same listening carrier as the second carrier; or The second base station listens for a period of time on the synchronization signal on the same listening carrier as the second carrier.
  • the indication information may further include a network listening format of the second base station
  • the processor 1001 is further configured to: according to the network listening information format information of the second base station, Listening to the synchronization signal on a carrier with the same second carrier frequency of a base station, where the synchronization signal is used by the first base station on the second carrier with the same network listening format as the second base station
  • the sync signal format is sent.
  • the information related to the frequency of the replacement of the interception carrier that is received by the first base station 100 is further included in the synchronization signal format of the second carrier-carrying synchronization signal.
  • the processor 1001 is further configured to:
  • the second carrier carries a synchronization signal format of the synchronization signal, and on the same carrier as the second carrier frequency of the first base station, the synchronization signal is intercepted by using the same network listening format as the synchronization signal format.
  • the synchronization signal is sent by the first base station on the second carrier according to the synchronization signal format, and the synchronization signal format includes the first base station sending The time resource and the frequency resource used by the synchronization signal; or the synchronization signal format includes a time resource and a frequency resource and a sequence resource used by the first base station to send the synchronization signal.
  • the processor 1001 is further configured to: listen to, on a carrier that is the same as the first carrier frequency of the first base station, a synchronization signal that is sent by the first base station to the second base station on the first carrier.
  • the indication information may further include a network listening format of the second base station, and correspondingly, the processor 1001 is specifically configured to:
  • the synchronization signal is intercepted in a time resource that is the same as the network listening format of the second base station.
  • the synchronization signal is opened by the first base station by using the network listening pattern of the second base station in a time resource that is the same as the network listening format of the second base station, Transmitting within a time resource of the first carrier that is the same as the network listening format of the second base station.
  • the information related to the frequency of the replacement of the interception carrier wave transmitted by the first base station 100 further includes a synchronization signal format of the first carrier-bearing synchronization signal.
  • the processor 1001 is further configured to:
  • the synchronization signal is intercepted by using a network listening format with the same format as the synchronization signal.
  • the synchronization signal is configured by the first base station according to a synchronization signal format of the first carrier-bearing synchronization signal configured by the first base station, by using the same time resource as the synchronization signal format.
  • a carrier is turned on, and is sent on the first carrier according to a synchronization signal format of the first carrier-bearing synchronization signal; where the synchronization signal format includes a time resource used by the first base station to send a synchronization signal The frequency resource resource; or the synchronization signal format includes a time resource and a frequency resource used by the first base station to send a synchronization signal, and a sequence resource.
  • the processor 1001 is further configured to: continue to listen to the first base station in the first carrier on a carrier that is the same as the first carrier frequency of the first base station by using an existing network listening format. A synchronization signal sent to the second base station.
  • the synchronization signal is sent by the first base station according to the synchronization signal format before the first carrier is turned off, by opening the first carrier in the same time resource as the synchronization signal format, and transmitting on the first carrier by using the synchronization signal format.
  • the system makes the synchronization signal format of the first base station and the network listening format of the second base station the same in a predefined manner.
  • the embodiment of the present invention provides another second base station 100, where the second base station 100 selects a listening carrier and a first base station; and sends indication information to the first base station, so that the first base station according to the The indication information determines that the first carrier to be closed by the first base station is the same as the interception carrier, and after the first carrier is turned off, sends a synchronization signal to the second base station according to a preset policy, where the indication The information includes the identifier of the second base station and the identifier of the interception carrier of the second base station listening for the synchronization signal; the second base station listens to the synchronization signal sent by the first base station according to the preset policy.
  • the second base station 100 can implement inter-station synchronization without re-searching the synchronization source base station, which reduces the impact on the data transmission of the user equipment and reduces the network listening overhead.
  • the target base station is prevented from serving the user equipment in the process of re-searching for the new synchronization source base station, which has a great influence on the data transmission of the user equipment and increases the defect of the network listening overhead.
  • Embodiment 9 Referring to FIG. 1 is a system for inter-station synchronization according to an embodiment of the present invention.
  • the system may include: The second base station described in the embodiment. Because the above embodiment has made detailed details on the specific functions of the first base station and the second base station. Detailed introduction, so I will not repeat them here. It can be seen that, in the system for inter-station synchronization provided by the embodiment of the present invention, the first base station receives the indication information sent by the second base station, where the indication information includes the identifier of the second base station and the second base station is listening.
  • An identifier of the listening carrier of the synchronization signal if the first base station determines, according to the indication information, that the first carrier to be turned off by the first base station is the same as the interception carrier, after the first carrier is turned off, And transmitting a synchronization signal to the second base station according to a preset policy.
  • the second base station selects the listening carrier and the first base station; and sends the indication information to the first base station, so that the first base station determines, according to the indication information, the first carrier to be turned off by the first base station, and the Detecting After the first carrier is turned off, the synchronization signal is sent to the second base station according to a preset policy, where the indication information includes an identifier of the second base station and a synchronization of the second base station.
  • the identifier of the listening carrier of the signal the second base station listens to the synchronization signal sent by the first base station according to the preset policy.
  • the second base station 100 can implement inter-station synchronization without re-searching the synchronization source base station, which reduces the impact on the data transmission of the user equipment and reduces the network listening overhead.
  • the target base station is prevented from serving the user equipment in the process of re-searching for the new synchronization source base station, which has a great influence on the data transmission of the user equipment and increases the defect of the network listening overhead.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are only schematic.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, It can be electrical, mechanical or other form.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
  • the software functional units described above are stored in a storage medium and include instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform portions of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a disk or an optical disk, and the like, which can store program codes. Medium.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • a disk or an optical disk, and the like which can store program codes.
  • a person of ordinary skill in the art may understand that all or part of the steps of the foregoing embodiments may be completed by a program to instruct related hardware (for example, a processor), and the program may be stored in a computer readable storage medium.
  • the storage medium may include: a read only memory, a random access memory, a magnetic disk or an optical disk, and the like.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé, un équipement et un système de synchronisation entre stations, se rapportant au domaine des communications. Suite à l'interruption d'une porteuse synchrone par une première station de base, une seconde station de base peut réaliser une synchronisation entre stations sans rechercher à nouveau une station de base source synchrone, ce qui permet de réduire l'influence sur une transmission de données d'un équipement d'utilisateur et de diminuer simultanément le surdébit pour une interception de réseau. Ledit procédé consiste à : recevoir, au moyen de la première station de base, des informations d'indication envoyées par la seconde station de base, les informations d'indication comprenant une identification de la seconde station de base et une identification d'une porteuse d'interception pour la seconde station de base servant à intercepter un signal synchrone ; et, si la première station de base détermine, conformément aux informations d'indication, qu'une première porteuse devant faire l'objet d'une interruption au moyen de la première station de base est identique à la porteuse d'interception, envoyer le signal synchrone à la seconde station de base conformément à une politique prédéfinie après l'interruption de la première porteuse.
PCT/CN2013/091176 2013-12-31 2013-12-31 Procédé, équipement et système de synchronisation entre stations Ceased WO2015100643A1 (fr)

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CN201380002675.3A CN105052219B (zh) 2013-12-31 2013-12-31 一种站间同步的方法、设备及系统

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CN102017738A (zh) * 2008-10-31 2011-04-13 联发科技股份有限公司 蜂窝式正交频分复用系统中的毫微微小区的下行链路网络同步机制
CN102271391A (zh) * 2010-06-03 2011-12-07 中兴通讯股份有限公司 微型基站间实现同步的方法及系统
US20120231807A1 (en) * 2011-03-11 2012-09-13 Qualcomm Incorporated Frequency and timing control for femtocell

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CN102017738A (zh) * 2008-10-31 2011-04-13 联发科技股份有限公司 蜂窝式正交频分复用系统中的毫微微小区的下行链路网络同步机制
CN102271391A (zh) * 2010-06-03 2011-12-07 中兴通讯股份有限公司 微型基站间实现同步的方法及系统
US20120231807A1 (en) * 2011-03-11 2012-09-13 Qualcomm Incorporated Frequency and timing control for femtocell

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