WO2017028045A1 - Procédé et dispositif de détermination de qualité de canal - Google Patents

Procédé et dispositif de détermination de qualité de canal Download PDF

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Publication number
WO2017028045A1
WO2017028045A1 PCT/CN2015/087070 CN2015087070W WO2017028045A1 WO 2017028045 A1 WO2017028045 A1 WO 2017028045A1 CN 2015087070 W CN2015087070 W CN 2015087070W WO 2017028045 A1 WO2017028045 A1 WO 2017028045A1
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WIPO (PCT)
Prior art keywords
time
frequency band
target cell
user equipment
target
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PCT/CN2015/087070
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English (en)
Chinese (zh)
Inventor
马瑞泽大卫•简-玛丽
郑娟
夏媛
李强
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2015/087070 priority Critical patent/WO2017028045A1/fr
Priority to CN201580071819.XA priority patent/CN107113636B/zh
Publication of WO2017028045A1 publication Critical patent/WO2017028045A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for determining channel quality.
  • the spectrum is the basis of wireless communication.
  • FCC Federal Communications Commission
  • LTE long Term evolution, long-term evolution
  • LAA-LTE Long-Assisted Access Long Term Evolution
  • LBT Listen Before Talk, abbreviation: LBT
  • CCA Clear Channel Assessment
  • English Clear Channel Assessment
  • the communication device can transmit a signal; if it is detected that the channel is occupied, the communication device is currently unable to transmit a signal.
  • data transmission of LTE equipment in unlicensed frequency bands is opportunistic, that is, discontinuous, as shown in Figure 1.
  • an LTE device (assumed to be an LTE base station) can use an unlicensed band for data transmission only when it is determined that the channel of the unlicensed band is idle. Therefore, in the time range in which the LTE base station performs data transmission on the unlicensed frequency band and the time range in which the LTE base station does not perform data transmission, the measurement result obtained by the user equipment served by the LTE device (assumed to be an LTE base station) for the unlicensed frequency band is different.
  • the measurement result of the unlicensed frequency band by the user equipment served by the LTE base station can assist the LTE base station to perform carrier selection and discovery of the hidden node. Therefore, how to ensure that the user equipment served by the LTE base station accurately measures the channel quality in the time range in which the LTE base station does not perform data transmission on the unlicensed frequency band is a major problem to be solved by the present invention.
  • An embodiment of the present invention provides a method for determining channel quality, which improves the accuracy of channel quality measured by user equipment served by an LTE base station within a time range in which an LTE base station does not perform data transmission on an unlicensed frequency band.
  • a first aspect of the embodiments of the present invention provides a method for determining channel quality, including:
  • the user equipment determines a measurement time set of the target frequency band, where the target frequency band is an operating frequency of the target cell, where the measurement time set is a time period before the target cell sends the data before the start time of the target frequency band and meets a predetermined condition. ;
  • the user equipment measures a wireless condition of the target frequency band within the measurement time set to obtain a measurement result.
  • the starting time is determined by the target cell after the LBT evaluation after the first listening.
  • the time period that satisfies the predetermined condition is adjacent to the start time.
  • the predetermined condition is met Time period, including:
  • M, N, S, and K are all positive integers.
  • the predetermined condition is met Time period, including:
  • the time period that meets the predetermined condition includes:
  • the first predetermined time interval includes a time occupied by a channel reservation signal transmitted by the target cell in the target frequency band during a time period before the first predetermined time interval.
  • the time period that meets the predetermined condition includes:
  • the second predetermined time interval is a time at which the target cell receives uplink data during a time period after the second predetermined time interval.
  • the user measures wireless conditions of the target frequency band within the set of measurement time, including:
  • the user equipment measures energy of the target frequency band within the set of measurement time.
  • the user The wireless condition that the device measures the target frequency band within the measurement time set includes at least one of the following:
  • the user equipment measures energy of the target frequency band in units of OFDM symbols
  • the user equipment measures energy of the target frequency band in units of listening time slots of the target cell;
  • the user equipment measures the energy of the target frequency band in units of listening time slots of the user equipment.
  • the method further includes:
  • the user equipment periodically reports the measurement result; and/or
  • the user equipment reports the measurement result before the start time; and/or
  • the user equipment reports the measurement result in a third predetermined time interval after the start time, where the third predetermined time interval is not greater than that required by the user equipment to report channel state information to the target cell. time.
  • a second aspect of the embodiments of the present invention provides a method for determining channel quality, including:
  • the target cell sends an indication message to the user equipment, where the indication message indicates a measurement time set of the target frequency band, the target frequency band is an operating frequency of the target cell, and the measurement time set is sent by the target cell in the target frequency band.
  • the method further includes:
  • the target cell performs an LBT evaluation after listening first, and obtains an evaluation result
  • the target cell determines the starting time according to the evaluation result.
  • the method further includes:
  • the target cell determines a random backoff number, where the random backoff number is determined before the target cell starts the idle channel assessment, and the time period that satisfies the predetermined condition is a time period that is located in the time corresponding to the random backoff number.
  • the method further includes:
  • the target cell sends a channel reservation signal to the user equipment before the start time, and the time period that satisfies the predetermined condition is a time period before the first predetermined time interval, where the first predetermined time interval is The time taken by the channel reservation signal.
  • the method further includes:
  • the target cell receives uplink data before the start time, the time period that satisfies a predetermined condition is a time period after a second predetermined time interval, and the second predetermined time interval is that the target cell receives the The time of the upstream data.
  • the method further includes:
  • the target cell determines a radio condition of the target frequency band according to the measurement result.
  • the method further includes:
  • the method when the target cell determines that the hidden node of the user equipment exists on the target frequency band, the method further includes: :
  • the target cell After the start time, the target cell shortens the data transmission time in the target frequency band.
  • a third aspect of the embodiments of the present invention provides an apparatus for determining channel quality, including:
  • a determining unit configured to determine a measurement time set of the target frequency band, where the target frequency band is an operating frequency of the target cell, where the measurement time set is before the start time of the target cell sending data in the target frequency band and meets a predetermined condition Time period
  • a measuring unit configured to measure a wireless condition of the target frequency band within the measurement time set, and obtain a measurement result.
  • the starting moment It is determined by the target cell after the LBT evaluation.
  • the time period that satisfies the predetermined condition is adjacent to the starting time.
  • the predetermined condition is met Time period, including:
  • M, N, S, and K are all positive integers.
  • Time period including:
  • the time period that meets the predetermined condition includes:
  • the first predetermined time interval includes a time occupied by a channel reservation signal transmitted by the target cell in the target frequency band during a time period before the first predetermined time interval.
  • the time period that meets the predetermined condition includes:
  • the second predetermined time interval is a time at which the target cell receives uplink data during a time period after the second predetermined time interval.
  • the user measures wireless conditions of the target frequency band within the set of measurement time, including:
  • the user equipment measures energy of the target frequency band within the set of measurement time.
  • the measuring The unit is used for at least one of the following:
  • the energy of the target frequency band is measured in units of listening time slots of the user equipment.
  • the measurement result is reported in a third predetermined time interval after the start time, where the third predetermined time interval is not greater than a time required by the user equipment to report channel state information to the target cell.
  • a fourth aspect of the embodiments of the present invention provides an apparatus for determining channel quality, including:
  • a sending unit configured to send an indication message to the user equipment, where the indication message indicates a measurement time set of the target frequency band, where the target frequency band is an operating frequency of the target cell, and the measurement time set is the target cell in the The time period before the start time of the data transmission of the target frequency band and the predetermined condition is met, so that the user equipment measures the wireless condition of the target frequency band within the measurement time set to obtain a measurement result.
  • the method further includes:
  • the evaluation unit is used to perform the LBT assessment after listening and obtaining the evaluation result
  • the first determining unit is configured to determine the starting moment according to the evaluation result.
  • the device further includes:
  • a second determining unit configured to determine a random backoff number, where the random backoff number is determined before the target cell starts the idle channel assessment, where the time period that satisfies the predetermined condition is within a time corresponding to the random backoff number period.
  • the sending unit is further configured to:
  • the time period satisfying the predetermined condition is a time period before the first predetermined time interval
  • the first predetermined time interval is the channel reservation signal Occupied time
  • the method further includes:
  • a first receiving unit configured to receive uplink data before the start time, where the time period that satisfies the predetermined condition is a time period after the second predetermined time interval, where the second predetermined time interval is the target cell The time at which the uplink data is received.
  • the method further includes:
  • a second receiving unit configured to receive a measurement result reported by the user equipment
  • a third determining unit configured to determine a radio condition of the target frequency band according to the measurement result.
  • the method further includes:
  • a fourth determining unit configured to determine whether the target frequency band exists according to the measurement result reported by the user equipment and the measurement result obtained by the target cell measuring the wireless condition of the target frequency band in the measurement time set A hidden node of the user equipment.
  • Data transfer unit for:
  • the target cell After the start time, the target cell shortens data transmission in the target frequency band between.
  • the measurement time set is a time period before the start time of the target cell transmitting data in the target frequency band and the predetermined condition is met. Therefore, the user equipment measures the wireless condition of the target frequency band in the measurement time set. And the channel state experienced by the user equipment after the data is sent to the user equipment by the target cell, thereby improving the accuracy of measuring the channel quality of the user equipment.
  • Figure 1 is a schematic diagram of LAA-LTE opportunistic data transmission in an unlicensed band
  • FIG. 2 is a schematic diagram of a hidden node around a user equipment
  • FIG. 3 is a flowchart of a method for determining channel quality according to an embodiment of the present invention
  • FIG. 4 is a first schematic diagram of a measurement time set in an embodiment of the present invention.
  • FIG. 5 is a second schematic diagram of a measurement time set according to an embodiment of the present invention.
  • FIG. 6 is a third schematic diagram of a measurement time set in an embodiment of the present invention.
  • FIG. 7 is a fourth schematic diagram of a measurement time set according to an embodiment of the present invention.
  • FIG. 8 is another flowchart of a method for determining channel quality according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a first module of an apparatus for determining channel quality according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic diagram of a first structure of an apparatus for determining channel quality according to an embodiment of the present disclosure
  • FIG. 11 is a schematic diagram of a second module of an apparatus for determining channel quality according to an embodiment of the present disclosure
  • FIG. 12 is a schematic diagram of a second structure of an apparatus for determining channel quality according to an embodiment of the present invention.
  • the method for determining the channel quality provided by the embodiment of the present invention is applicable to a wireless communication system, and is particularly used for an LTE system that is authorized to access a frequency band, that is, an LAA-LTE system.
  • the LTE system in which the licensed band is assisted to access is an LTE system in which the licensed band and the unlicensed band are mixed by CA (Chinese: Carrier Aggregation) or non-CA mode.
  • CA Carrier Aggregation
  • non-CA mode One possible application scenario is:
  • a scenario in which a licensed band and an unlicensed band are jointly used by a CA that is, a carrier band to be licensed, or a carrier included in a licensed band, or a cell operating in a licensed band as a primary cell, and a carrier or a work included in an unlicensed band or an unlicensed band
  • the cell in the unlicensed frequency band is used as the secondary cell, where the primary cell and the secondary cell can be deployed in a common station or in a non-common station, and an ideal backhaul path exists between the two cells.
  • the embodiment of the present invention is not limited to the application scenario, and may be applicable to other application scenarios, for example, a scenario where there is no ideal backhaul path between two cells (the primary cell and the secondary cell), that is, the backhaul delay is large. This prevents the coordination information from being transmitted quickly between the two cells.
  • a cell operating in an unlicensed frequency band is independently deployed, that is, a cell operating in an unlicensed frequency band can directly provide an independent access function, and does not need to be assisted by a cell operating on a licensed frequency band.
  • the licensed frequency band or the unlicensed frequency band may include one or more carriers, and the carrier frequency band of the licensed frequency band and the unlicensed frequency band may be: one or more carriers and non-carriers included in the licensed frequency band. Carrier aggregation is performed by one or more carriers included in the licensed band.
  • the cell in the embodiment of the present invention may be a cell corresponding to the base station.
  • the cell may be a cell corresponding to the macro base station, and the cell may also be a small cell, where the small cell may be a packet.
  • these small cells Including: a metro cell, a micro cell, a pico cell, a femto cell, etc., these small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high Rate data transfer service.
  • the concept of a cell and a carrier is equivalent.
  • the carrier index of the secondary carrier and the cell identifier (Cell ID) of the secondary cell working in the secondary carrier are carried. Accessing one carrier and accessing one cell are equivalent.
  • the user equipment may also be referred to as a mobile terminal (Mobile Terminal), a mobile user equipment, or the like, and may be connected to one or more core networks (CN, Core Network) through a radio access network (RAN).
  • the user device can be, for example, a mobile phone or a computer with a mobile terminal, such as a portable, pocket, handheld, computer built-in or in-vehicle mobile device.
  • a mobile terminal such as a portable, pocket, handheld, computer built-in or in-vehicle mobile device.
  • Any device that can communicate with the base station can be used as a user equipment, and the user equipment can also include a relay.
  • the downlink data is sent to the user equipment by the cell as an example.
  • the CCA needs to determine whether the unlicensed frequency band has been occupied by other devices, and the CCA can pass the energy detection and/or Signal detection is implemented.
  • the method for determining whether the unlicensed frequency band is available through the LBT may bring a hidden node problem.
  • the node in FIG. 2 may be an eNB or a Wi-Fi connection. In Point (AP).
  • AP In Point
  • the CCA range of Node 1 indicates that other nodes within the CCA range will be detected by Node 1 if they send a signal. For example, if other nodes in the CCA range preemptively occupy the unlicensed frequency band, the node 1 will judge that the node has preempted the unlicensed frequency band through energy detection and/or signal detection when intercepting the unlicensed frequency band. Therefore, the unlicensed band will be considered occupied.
  • Node 1 For other nodes outside the CCA range of Node 1, such as Node 2 in Figure 2, even if Node 2 preempts the unlicensed band, although Node 1 is able to receive the signal sent by Node 2, However, the signal is attenuated such that the energy value of the signal reaching node 1 is lower than the energy threshold in CCA, or lower than the minimum signal to interference plus noise ratio (SINR) required for signal detection. That is, even if node 2 has preempted the unlicensed band and sent a signal, when node 1 performs CCA on the unlicensed band, it will consider that the unlicensed band is idle, or is not occupied by other devices. At this time, Node 1 also uses the unlicensed band for data transmission.
  • SINR minimum signal to interference plus noise ratio
  • the node 1 and the node 2 simultaneously use the same unlicensed frequency band for data transmission.
  • the interference from the node 2 is received, especially for the user equipment relatively close to the node 2, the interference of the received node 2 is more.
  • the quality of data communication between Node 1 and the user equipment is greatly affected.
  • the cell that provides the data service for the user equipment is called the serving cell of the user equipment.
  • the node 1 provides the data service for the user equipment, and the node 1 is the service node of the user equipment.
  • the user equipment can measure the channel quality of the unlicensed frequency band and send it to the serving cell.
  • the serving cell receives the measurement result sent by the user equipment, and according to the measurement result, determines the channel quality when the serving cell and the user equipment perform data transmission on the unlicensed frequency band.
  • the user equipment uses the Discovery Reference Signal (DRS) sent by the serving cell to measure the channel quality and measure the channel quality.
  • DRS Discovery Reference Signal
  • the result is reported to the serving cell or other cell that performs carrier aggregation with the serving cell.
  • the serving cell that sends the DRS is the secondary cell of the user equipment, and the other cells may be the primary cell or other secondary cells, where the measurement result may be Reference Signal Received Power (RSRP) and/or reference signal. Receive Signal Received Quality (RSRQ).
  • RSRP Reference Signal Received Power
  • RSRQ Receive Signal Received Quality
  • the transmission opportunity of the DRS cannot be always guaranteed, so detecting the hidden node by the DRS may make the measurement time longer.
  • CSI Channel State Information
  • the time interval from the CSI measurement to the CSI reporting is at least 4 ms.
  • the time for transmitting the downlink data is limited. Assuming that the serving cell uses the unlicensed frequency band to send downlink data to the user equipment for 10 ms, the serving cell cannot determine the hidden node problem within the first 4 ms of the 10 ms. Therefore, if the serving cell has a hidden node in the vicinity of the 4 ms scheduling, The user equipment, the reliability of data transmission will be affected, and will also affect the efficiency of the data transmission of the serving cell.
  • the embodiments of the present invention provide a method for determining channel quality, which realizes that hidden nodes of user equipments in the LAA-LTE system are discovered in advance, thereby improving data transmission efficiency and overcoming the opportunity of DRS.
  • the effect of transmission on hidden node discovery such as lengthening the measurement time.
  • FIG. 3 is a flowchart of a method for determining channel quality according to an embodiment of the present invention. The method includes the following steps:
  • Step 101 The user equipment determines a measurement time set of the target frequency band, where the target frequency band is an operating frequency of the target cell, and the measurement time set is before the start time of the target cell sending data in the target frequency band and meets a predetermined condition. Time period.
  • Step 102 The user equipment measures a radio condition of the target frequency band in the measurement time set to obtain a measurement result.
  • the target cell may be a cell that provides data services to the user equipment, that is, the serving cell in the embodiment of the present invention.
  • the target cell may also be a neighboring cell that currently does not provide service for the user equipment but potentially can serve the user equipment in the future.
  • the concept of a serving cell and a neighboring cell is exemplified below.
  • the LTE base station can simultaneously transmit signals on multiple carrier frequencies, such as F1, F2, F3, and F4.
  • F1, F2, F3, and F4 the carrier frequencies
  • the LTE base station needs to determine whether the resources of the four carrier frequencies can be utilized by using the LBT before transmitting the signals on the four carrier frequencies (which may correspond to the target frequency band in the embodiment of the present invention).
  • Send data the signals on the four carrier frequencies (which may correspond to the target frequency band in the embodiment of the present invention).
  • the concept of a carrier and a cell in a LAA-LTE system may be considered to be equivalent, or more generally, in a CA scenario, a concept of a carrier and a cell may be considered to be equivalent, and thus, when LTE When the base station transmits signals by using the above four carrier frequencies (or carriers), it can be considered that four cells belonging to the LTE base station are transmitting signals, and the transmission signal may include a Discovery Reference Signal (DRS).
  • DRS Discovery Reference Signal
  • the carrier aggregation capability of the user equipment is generally smaller than the carrier aggregation capability of the base station, even if the LTE base station can simultaneously use four carrier frequencies for data transmission, the user equipment served by the LTE base station can only receive the carrier aggregation capability range at the same time.
  • the signal sent by the inner cell assumes that the user equipment can simultaneously receive data transmission of two carrier frequencies, for example, can simultaneously receive signals transmitted by cells operating in F1 and F2, in this case, working in the cells of F1 and F2. It can be regarded as the serving cell of the user equipment.
  • the measurement of the user equipment for F1 and F2 can be regarded as the same frequency measurement, and the cell working at F3 and F4 can be regarded as the cell belonging to the same serving base station as the serving cell of the user equipment. It belongs to the neighboring cell, and the measurement of the user equipment for F3 and F4 can be regarded as the inter-frequency measurement.
  • the cell operating in F1 and F2 is the serving cell of the user equipment, and the cells working in F3 and F4 are neighboring cells.
  • the data transmission assuming that the user equipment can simultaneously receive the signals transmitted by the cells operating in F1 and F3, may also be that the cells operating at F1 and F3 are serving cells, and the cells operating at F2 and F4 are neighboring cells.
  • a neighboring cell may be understood as a cell on another frequency different from the frequency of the serving cell of the user equipment, and may also be understood as another cell that is the same as the serving cell of the user equipment but different from the serving cell of the user equipment.
  • the neighboring cell and the serving cell may belong to one base station or belong to different base stations.
  • the target frequency band refers to a frequency band resource that is sent by a network side device, such as an LTE base station, and may be represented by a carrier frequency or a carrier frequency or a carrier frequency, which may include an unlicensed band or an unlicensed band.
  • a network side device such as an LTE base station
  • Any carrier included in the carrier may also include any carrier included in the licensed band or the licensed band.
  • Different carriers may be represented by different frequency ranges, or may be represented by different channel numbers, or may be represented by different carrier frequencies.
  • the present invention The example is not limited.
  • the target frequency band may be a frequency band in which the network device sends the DRS, and for the user equipment, the frequency band configured with the DRS may be configured, or the configuration reference signal measurement timing configuration is configured ( Discovery Reference Measurement Timing Configuration, DMTC).
  • DMTC Discovery Reference Measurement Timing Configuration
  • the target frequency band is used as an unlicensed frequency band for description.
  • the LTE base station can transmit signals by using multiple carrier frequencies. If multiple carrier frequencies belong to unlicensed frequency band resources, the LTE base station can determine by using Listening Before Talk (LBT) when transmitting signals on the multiple carrier frequencies. Whether it is possible to send a signal.
  • the target frequency band is the working frequency of the target cell.
  • the working frequency of the target cell can be determined by frequency information or by frequency information and bandwidth information.
  • the frequency is 2 GHz and the bandwidth is 20 MHz.
  • the user equipment the user equipment can determine which cell is the target cell, and can also know the working frequency of the target cell, and then use the working frequency of the target cell as the target unlicensed frequency band.
  • the network side device for example, the LTE base station
  • the network side device can directly notify the user equipment of the target frequency band.
  • the cell that belongs to the network side device for example, the cell working in F1-F4 mentioned in the above example, may also notify the user equipment of the target frequency band.
  • the user equipment determines the starting time of the data sent by the target cell in the target unlicensed band, and may pass at least one of the following:
  • the preamble sequence herein may include a sequence with a good correlation, such as a sequence consisting of a Primary Synchronization Signal (PSS) and/or a Secondary Synchronization Signal (SSS).
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • the start time may be a time when the target cell actually sends data in the target unlicensed band, and the start time may also be that the target cell is potentially sent in the target unlicensed band. The moment of sending data.
  • the target cell can determine the moment when the data is actually transmitted through the LBT evaluation. At this time, the starting time is determined by the target cell after the LBT evaluation after the first listening. At the moment when the data is potentially transmitted, the target cell may or may not transmit data. For example, if the target cell determines that the data can be transmitted at the time of potentially transmitting data through the LBT evaluation, the target cell may start at the moment when the potential data is sent.
  • the time at which the potential data is transmitted is the time when the target cell actually transmits data in the target unlicensed frequency band; on the other hand, if the target cell is determined by the LBT evaluation, the potential is When the data is transmitted, the data cannot be transmitted at the moment, and then the target cell does not transmit data at the time when the potential data is transmitted, and the target cell can continue to determine the time of the true data transmission through the LBT evaluation.
  • the target cell determines the potential data transmission time according to the complexity of the user equipment detection. For example, if the user equipment determines the data transmission time by blind detection, the selected potential data transmission time can reduce the number of blind detections of the user equipment. For example, in one subframe, the potential data transmission time may be located at a symbol boundary, or the potential data transmission time is a fixed OFDM symbol, because the user equipment generally detects the data in units of OFDM compliance, so the potential data is The transmission time is limited to the symbol boundary or the fixed OFDM symbol, which helps the user equipment to perform signal detection;
  • the target cell can also determine the moment of potential data transmission from the perspective of facilitating data communication with the user equipment. Assuming that the time of the potential data transmission is within one subframe, the data transmission length is less than the length of one subframe from the time of the potential data transmission to the end of the subframe, so how to effectively use the partial subframe for data transmission,
  • TBS Transmission Block Size
  • RS Reference Signal
  • the moment when the starting time is the potential transmission data is taken as an example for description.
  • the target cell when there are 4 potential transmission data in one subframe, if the target cell passes the LBT to determine the target unlicensed frequency band at the time of the second potential transmission data, Usage, then the target cell can send data from the moment when the second potential data is sent. At this time, the time at which the second potential data is transmitted becomes the time at which the target cell actually transmits data in the target unlicensed band. Since the target cell starts transmitting data from the time when the second potential data is transmitted, the time period between the time when the second potential data is transmitted and the time when the data is transmitted is the target cell actually transmitting data in the target unlicensed band. time.
  • the measurement time set is a time period before the start time of the target cell transmitting the data in the target unlicensed frequency band and the predetermined condition is met, and the measurement time set is different according to the predetermined condition.
  • the set of measurement times is adjacent to the start time. That is, the time period in which the predetermined condition is satisfied is adjacent to the start time.
  • the measurement time set is located in a listening unit that is before the start time of the target cell to transmit data in the target unlicensed band and is closest to the start time.
  • the listening unit in this document may be the minimum time unit that the target cell needs to listen before the data is sent. For example, it may be a listening time slot (which can be represented by CCA slot) or a listening time slot plus A delay time (Defer Time). It can also be M listening slots, or a time unit consisting of M listening slots and N defer times. M and N are both positive integers. Furthermore, if considering the data processing capabilities of the UE, the listening unit can also be K OFDM symbols, where K is a positive integer.
  • the listening unit here may also be the minimum detection unit required for the user equipment to detect the target unlicensed frequency band, for example, the listening time slot used by the user equipment, or other time unit, which is not limited in the embodiment of the present invention.
  • the following further description illustrates the concept of a listening time slot: taking a base station as an example (which may also be a target cell), and if the base station accesses a channel of an unlicensed frequency band, following a backoff procedure of Extended CCA (ECCA) detection, the base station Before each ECCA test is performed, a random backoff number N needs to be generated in the counter.
  • the base station determines whether the channel in a CCA slot is idle every time through the CCA detection. If the channel is idle, the value of N in the counter is decremented by 1. If the channel is detected to be busy, the value of N in the counter is unchanged, so the value of N is It varies with channel detection conditions. Therefore, for the target cell, one listening time slot of the target cell can be understood as a CCA slot.
  • ECCA Extended CCA
  • the time period in which the predetermined condition is met includes:
  • the time period that satisfies the predetermined condition is a listening time slot adjacent to the starting time, or the time period that satisfies the predetermined condition is composed of one listening time slot and one delay time.
  • the time period, the listening time slot is adjacent to the starting time, and the delay time is before the listening time slot and adjacent to the listening time slot.
  • the listening time slot, the delay time, and the OFDM mentioned above may also be replaced with other time units, which are the listening units known to the network side device and the user equipment.
  • the measurement time set is located in the last CCA slot of the target cell before the start time of the data transmission of the target unlicensed band and is closest to the start time, if the target cell starts transmitting data at the start time of the data transmission of the target unlicensed band Then, the interception result of the last CCA slot of the target cell before the start time can indicate that the resources of the target unlicensed band are not occupied by other devices.
  • the measurement time set is located before the start time of the target cell transmitting data in the target unlicensed band and the last CCA slot closest to the start time plus a defer time, if the target cell is in the target unlicensed band
  • the interception result of the target cell in the last CCA slot plus a defer time before the start time can indicate that the resources of the target unlicensed band are not occupied by other devices.
  • the listening result of the target cell to the target unlicensed band indicates that the resource of the target unlicensed band is not occupied by other devices.
  • other devices herein refer to the target cell listening range.
  • the device inside that is, if other devices here transmit data in the target unlicensed band, the target cell can determine that the target unlicensed band has been occupied by other devices by means of energy detection and/or signal detection. If the measurement time set of the user equipment is limited to the range, the measurement result of the measurement time set by the user equipment includes the background noise, and the data transmission has been performed in the target unlicensed frequency band but the target cell cannot detect the target cell.
  • the other device the hidden node.
  • the measurement result of the user equipment is used with the target cell. If the measurement result of the user equipment is different from the listening result of the target cell, it may indicate that there is a hidden node. Further, since the measurement time set is immediately adjacent to the start time of the transmitted data, the measurement result is relatively close to the channel state experienced by the user equipment after the target cell transmits the data.
  • FIG. 4 shows the first schematic diagram of the measurement time set.
  • FIG. 4 assuming that there are four times at which data is potentially transmitted within one subframe, there is a set of measurement times at the moment before each potential data transmission time, and immediately or not immediately adjacent to the potential transmission data.
  • the time of the first potential transmission data is not adjacent to the measurement time set, and the remaining potential transmission data is adjacent to the measurement time set.
  • the measurement time set is located before the start time of the target cell transmitting data in the target unlicensed band and the first predetermined time interval from the start time.
  • the description of the listening unit is as described above.
  • the predetermined time interval may be determined by the network side device and notified to the user equipment.
  • the predetermined time interval is a time occupied by the channel reservation signal sent by the target cell, and the measurement time set is determined according to a time occupied by the channel reservation signal. That is, the time period that satisfies the predetermined condition includes: a time period before the first predetermined time interval, the first predetermined time interval including a time occupied by the channel reservation signal sent by the target cell in the target frequency band.
  • the channel reservation signal is a signal that is sent before the target cell preempts the target unlicensed band but the time at which the data is actually sent has not yet arrived.
  • the main function of the channel reservation signal is to help the target cell occupy the channel first. As shown in FIG. 4, if the target cell determines that the target unlicensed band resource can be used by the LBT mechanism before the time when the data is potentially transmitted, but since the time at which the data is potentially transmitted has not arrived, in order to prevent waiting for the potential transmission in the target cell. Before the arrival of the data, other devices capable of operating in the target unlicensed band occupy the target unlicensed band, and the target cell may send the channel reservation signal after determining that the target unlicensed band resource is available and potentially transmitting data.
  • the channel reservation signal is different from the data sent by the target cell in this document.
  • the data sent by the target cell mainly refers to data that the user equipment needs to detect and/or demodulate, for example, PDCCH (Chinese: Physical downlink control channel; English: Physical Downlink Control Channel), data carried by EPDCCH (Chinese: Enhanced Physical Downlink Control Channel; English: Enhanced Physical Downlink Control Channel), PDSCH (Chinese: Physical Downlink Shared Channel; English: Physical Downlink Shared Channel) data, reference signals, etc.
  • the test time set is a time period from a predetermined time interval from the start time, wherein the predetermined time interval refers to the time occupied by the channel reservation signal
  • the test time set is not only before the start time but also before the time occupied by the channel reservation signal. Therefore, it can be considered that the test time set is the listening unit before the time occupied by the channel reservation signal.
  • FIG. 5 shows a second schematic diagram of the measurement time set.
  • the first predetermined time interval may be the time occupied by the channel reservation signal.
  • the user equipment since the test time set is the listening unit before the time occupied by the channel reservation signal, the user equipment can detect the energy of the signal sent from other devices in the target unlicensed band.
  • the target cell because the target cell must preempt the target unlicensed band before transmitting the channel reservation signal, the target cell can detect the idle channel in the listening unit before the channel reservation signal. In this way, by comparing the listening results of the user equipment and the target cell, it can be determined whether there is a hidden node.
  • the role of the target cell transmitting the channel reservation signal is to indicate that the target unlicensed band has been preempted by the target cell, but since the time at which the data is actually transmitted has not arrived, the target cell has not started transmitting data yet. Therefore, limiting the set of measurement time in the time domain to the time occupied by the channel reservation signal ensures that the user equipment and the target cell perform energy detection on the target unlicensed frequency band within the same time resource range, thereby ensuring the user equipment and the target. The comparability of the measurement results of the cell in the target unlicensed band.
  • the target cell sends a channel reservation signal, indicating that the target cell arrives at the time when the data is actually sent to implement data transmission, so limiting the measurement time set to the time occupied by the channel reservation signal, and also ensuring the measurement result and target of the user equipment.
  • Cell preemption to target is not authorized
  • the channel state experienced by the user equipment is similar, which is convenient for discovering hidden nodes.
  • a first predetermined time interval associated with the channel reservation signal length may be defined herein as the maximum length of the channel reservation signal. Further, the maximum length of the channel reservation signal is related to the time interval between two adjacent potential data transmission times.
  • the user equipment may determine the measurement time set by using the first implementation, in which case the user equipment sends the target unlicensed frequency band to the target cell.
  • the channel retains the influence of the signal, but since the target cell is sure to transmit the channel reservation signal on the target unlicensed frequency band, the target cell may process the measurement result after receiving the measurement result reported by the user equipment, so that the measurement result is obtained.
  • the influence of the channel reservation signal transmitted by the target cell on the measurement result is not included.
  • the set of measurement times is determined based on the number of random backoffs.
  • the measurement time set may be adjacent to the start time or may be a predetermined time interval from the start time. That is, the time period that satisfies the predetermined condition includes: a time period located in a time corresponding to the random backoff number, and the random backoff number is determined before the target cell initiates the idle channel assessment.
  • the random backoff number will be described. If the base station accesses the channel of the unlicensed band and follows the backoff procedure of the ECCA detection, the base station needs to generate a random backoff number N before each execution of the ECCA detection, and is stored in the counter. The base station determines whether the channel in a CCA slot is idle every time through the CCA detection. If the channel is idle, the value of N in the counter is decremented by 1. If the channel is detected to be busy, the value of N in the counter is unchanged, so the value of N is It varies with channel detection conditions.
  • the random backoff number may be an initial value of N used by the base station in the ECCA detection process.
  • the generated random backoff value N is 50, and the random backoff number is 50; the random backoff number may also be a value of N used by the base station in the ECCA detection process, for example, The base station generates a random backoff value N of 50 before performing ECCA detection. After a period of channel detection, it is determined that the N values in the counter are reduced from 50 to 45 after the five CCA slots are idle, that is, the random backoff number may be 45.
  • the user equipment first determines the random backoff number, and then uses the time resource included in the time corresponding to the start time of the target cell to transmit data in the target unlicensed frequency band and the random backoff number as the measurement time set.
  • the time corresponding to the random backoff number before the start time of the data transmitted by the target cell in the target unlicensed band may also be used as the measurement time set.
  • the user equipment can directly determine the time corresponding to the random backoff number.
  • the time corresponding to the random backoff number may be determined by the backoff number and the listening time slot, where the listening time slot may be a listening time unit used by the target cell to listen to the target unlicensed frequency band.
  • a CCA slot mentioned above may also be a listening unit or an energy detecting unit used when the user equipment listens to the target unlicensed frequency band.
  • the user equipment may set the 50 CCAs before the start time of the data sent by the target cell in the target unlicensed frequency band.
  • Any CCA slot within a slot is used as a set of measurement times. It is also possible to use a plurality of consecutive or discontinuous CCA slots in the 50 CCA slots located before the start time of the target cell to transmit data in the target unlicensed band as the measurement time set.
  • the time period corresponding to any one or more time units in the time period corresponding to the random backoff number may be used as the measurement time set, or the time period corresponding to the random backoff number may be used as the measurement time set, that is, the random backoff number All time resources included in the corresponding time period are used as a measurement time set.
  • the time unit may be a CCA slot (CCA slot), or may be an OFDM symbol, and may also include a minimum detection unit required by the user equipment to detect a target unlicensed band as described above.
  • FIG. 6 shows a third schematic diagram of the measurement time set.
  • the time of the first potential transmission data and the time of the fourth potential transmission data are adjacent to the measurement time set, the time of the second potential transmission data, and the time and measurement time set of the third potential transmission data.
  • the set of measurement time adjacent to the fourth potential transmission data is a time period corresponding to the random backoff number, and the other measurement time set is any one or more time units within the time period corresponding to the random backoff number.
  • the target cell For the target cell, the target cell needs to randomly select the random backoff number before starting the idle channel assessment (CCA) for the target unlicensed band, and then listen to the target unlicensed band within the time corresponding to the random backoff number. Determine the availability of the target unlicensed band. Therefore, limiting the set of measurement time in the time domain to the listening time corresponding to the random backoff number ensures that the user equipment and the target cell perform energy detection on the target unlicensed frequency band within the same time resource range, thereby ensuring the user equipment. Comparability with the measurement results of the target cell in the target unlicensed band.
  • CCA idle channel assessment
  • the target cell selects the random backoff number to listen to the target unlicensed frequency band, indicating that the target cell has data to be sent, so the measurement time set is limited to the listening time corresponding to the random backoff number, and the measurement result of the user equipment is also guaranteed.
  • the target cell preempts the target unlicensed band resource and performs data transmission, the channel state experienced by the user equipment is similar, which is convenient for discovering the hidden node.
  • the measurement time set is determined according to the time at which the target cell receives the uplink data.
  • the set of measurement times is usually not adjacent to the starting time. That is, the time period that satisfies the predetermined condition includes: a time period after the second predetermined time interval, and the second predetermined time interval is a time when the target cell receives the uplink data.
  • the data that the target cell can receive is the data sent by other devices on the target unlicensed band. Therefore, the listening unit after the time when the target cell receives the uplink data can be used as the measurement time set.
  • the user equipment measures the channel of the target unlicensed frequency band in the measurement time set
  • the target cell also measures the channel of the target unlicensed frequency band in the measurement time set, and the measurement results of both are on the target unlicensed frequency band.
  • the data sent by other devices compares the measurement results of the user equipment and the target cell to determine whether there is a hidden node.
  • FIG. 7 shows a fourth diagram of the measurement time set.
  • FIG. 7 assuming that there are four times when data is potentially transmitted in one subframe, there is a measurement time set before the time when each potential data is transmitted and after the time when the target cell receives the uplink data. Hehe.
  • Step 102 includes the user equipment measuring energy of the target frequency band within the set of measurement time. Specifically, it includes at least one of the following:
  • the user equipment measures energy of the target frequency band in units of OFDM symbols
  • the user equipment measures energy of the target frequency band in units of listening time slots of the target cell;
  • the user equipment measures the energy of the target frequency band in units of listening time slots of the user equipment.
  • the user equipment performs interference energy measurement within the measurement time set, and the interference energy measurement may include receiving energy on the target unlicensed frequency band within the measurement time set.
  • the user equipment may receive energy in the target unlicensed frequency band in a time granularity unit in the measurement time set.
  • the time granularity may be: an OFDM symbol, a listening time slot of the target cell, or a listening time slot of the user equipment.
  • the interference energy measurement result can be expressed by a Received Signal Strength Indicator (RSSI) class (ie, RSSI-like). It should be noted that although the RSSI-like is used, the measurement result is not for the target.
  • the reference signal sent by the cell is obtained.
  • the user equipment measures the energy of the target unlicensed frequency band in the measurement time set, and may further include: the user equipment is based on the physical measurement or spectrum of the target unlicensed frequency band.
  • Related measurements or detections such as analysis or spectrum sensing, such as energy sensing or energy detection, covariance matrix detection, matched filter detection, and cyclostationary feature detection (Cyclostationary Feature) Detection), eigenvalue based spectrum sensing, Received Signal Strength Indication (RSSI), Interference Measurement, and Rise Over Thermal (ROT) .
  • the user equipment After performing step 102 and obtaining the measurement result, the user equipment needs to send the measurement result to The target cell compares the measurement result in the measurement time set with the measurement result reported by the user equipment to determine whether there is a hidden node around the user equipment.
  • the user equipment sends the measurement result to the target cell, including:
  • the user equipment periodically reports the measurement result; and/or
  • the user equipment reports the measurement result before the start time; and/or
  • the user equipment reports the measurement result in a third predetermined time interval after the start time, where the third predetermined time interval is not greater than that required by the user equipment to report channel state information to the target cell. time.
  • the user equipment may periodically report to the target cell.
  • the target cell may also be reported to the target cell in an event-triggered manner.
  • the user equipment may determine the start time of the data sent by the target cell, and then send the measurement result to the target cell before the start time, so that the target cell can determine whether there is a hidden node around the user equipment before transmitting the data.
  • the user equipment may send the measurement result to the target cell after or before one or more potential data transmission moments, or may send the measurement result only after or before the time when the target cell actually transmits the data.
  • the user equipment may determine the time at which the target cell actually transmits data, and then send the measurement result to the target cell within a third predetermined time interval after the time when the target cell actually transmits the data.
  • the sending of the measurement result to the target cell is completed within 4 subframes after the time when the target cell actually sends the data.
  • the target cell can determine whether there is a hidden node around the user equipment within 4 subframes after the time when the data is actually transmitted.
  • the user equipment reports the measurement result to the target cell within 4 subframes, and reports the measurement result to the target cell in advance. So that the target cell judges earlier whether there is a hidden node around the user equipment.
  • the user equipment may report the measurement result to the target cell, or may be reported to the base station to which the target cell belongs, or belong to the same target cell as the target cell.
  • Other cells of the base station transmit.
  • the indication information may be a Pcell that belongs to the same base station as the target cell (Chinese: primary cell; English: Primary)
  • the transmission may be performed by the other Scells (Chinese: Secondary Cell; English: Secondary Cell) of the same base station.
  • the user equipment may report the measurement result to the network side device.
  • the network side device includes an LTE base station, and may also include a Pcell managed by the LTE base station in the CA scenario. And Scell. More generally, the network side device may further include: a device capable of providing data services for the user equipment, where the data includes data carried by the service data channel and/or data carried by the control data channel, and the network side device may further include A device that provides measurement configuration information to user devices.
  • the measurement result reported by the user equipment may be an average value of measurement results obtained in a plurality of measurement sets, or may be a measurement result obtained in a single time measurement set, also referred to as an instantaneous value (one-shot measurement).
  • the user equipment may directly report the average value or the instantaneous value of the multiple measurement results, or may also report the index value of the measurement result, and the different index values correspond to different measurement results or different measurements.
  • the result interval or may be reported in a manner that is higher or lower than a preset threshold, or may be reported in a percentage manner, for example, according to different preset thresholds, the statistics are within the measurement time set, and are higher than different preset thresholds. The proportion of energy test results in all results.
  • the base station can manage the mobility of the UE, for example, the cell handover of the secondary eNB, the cell selection, and the like.
  • the usage status of the target unlicensed frequency band in the target time set of the target cell is an unused state, and the unused state includes a target cell. Due to reasons such as LBT, there is no opportunity to preempt the data transmission to the first target frequency band, and thus the first target frequency band cannot be used to transmit data.
  • the data includes signals and/or data transmitted using a channel.
  • the target cell may also send only the channel occupation signal within the measurement time set without transmitting other signals and/or data transmitted by using the channel.
  • the resource used by the user equipment to obtain the measurement result may be referred to as a measurement resource, where the measurement resource includes a time resource and a frequency resource, where the time resource is in the Within the measurement time set, that is, the time time resource may be all or part of the time resource included in the measurement set, where the partial time resource may be continuous or So it is not continuous.
  • the embodiment of the present invention has no limitation on frequency resources, that is, all frequency resources of the target unlicensed frequency band included in the time resource, and may also be partial frequency resources.
  • the foregoing method for determining channel quality for a user equipment mainly describes how the measurement time set is determined, and then the user equipment measures the wireless condition of the target unlicensed frequency band in the measurement time set to obtain a measurement result.
  • One possible method for determining the measurement time set is: the target cell indicates which period of time the user equipment is a measurement time set. It should be noted that the target cell here may also be replaced by a network side device, that is, the network side device may indicate that the user equipment measures the time set. In the embodiment of the present invention, the target cell is taken as an example for description. Therefore, the embodiment of the present invention further provides a method for measuring channel quality, as shown in FIG. 8, including:
  • Step 201 The target cell sends an indication message to the user equipment, where the indication message indicates a measurement time set of the target frequency band, the target frequency band is an operating frequency of the target cell, and the measurement time set is the target cell in the The time period before the start time of the data transmission of the target frequency band and the predetermined condition is met, so that the user equipment measures the wireless condition of the target frequency band within the measurement time set to obtain a measurement result.
  • the target cell For the description of the target cell, the target frequency band, the starting time, and the measurement time set, please refer to the previous text, and will not be repeated here.
  • the indication information may also be sent by the base station to which the target cell belongs, or by other cells that belong to the same base station as the target cell.
  • the indication information may be sent by a Pcell that is the same base station as the target cell, or may be sent by other Scells that belong to the same base station.
  • the measurement time set may be determined by the target cell, and may also be a standard protocol specification.
  • the target cell may directly configure the measurement time set to the user equipment, and then the user equipment measures the wireless condition of the target unlicensed frequency band in the measurement time set, obtains and reports the measurement result to the target cell.
  • a manner in which the target cell configures the measurement time set to the user equipment is: sending an indication message to the user equipment, where the indication message carries a measurement time set, so that the user equipment measures the wireless condition of the target unlicensed frequency band in the measurement time set, and obtains And reporting the measurement result to the target cell, which In this case, the user equipment only needs to execute according to the instruction information. The user equipment does not need to determine the measurement time set by itself.
  • the starting time may be the time when the target cell actually sends data in the target unlicensed frequency band.
  • the target cell determines the starting time after the first listening and then the LBT evaluation. Therefore, the method further includes The target cell performs the LBT evaluation after the first listening, and obtains the evaluation result; the target cell determines the starting time according to the evaluation result.
  • the specific target cell determines the starting time according to the LBT evaluation, which has been explained in the foregoing, and will not be described here.
  • the method further includes: determining, by the target cell, a random backoff number, the random backoff number It is determined that the target cell starts the idle channel assessment, and the time period that satisfies the predetermined condition is a time period that is within a time corresponding to the random backoff number. How to determine the random backoff number for the specific target cell has been explained in the foregoing, and will not be described here.
  • the method further includes: the target cell sending a channel reservation signal to the user equipment before the start time,
  • the time period in which the predetermined condition is satisfied is a time period before the first predetermined time interval, and the first predetermined time interval is a time occupied by the channel reservation signal.
  • the measurement time set is determined according to the time when the target cell receives the uplink data, and therefore, the method further includes: the target cell receiving uplink data before the start time, the meeting is satisfied.
  • the time period of the condition is a time period after the second predetermined time interval, and the second predetermined time interval is a time at which the target cell receives the uplink data.
  • the measurement result of the user equipment can assist the target cell to determine whether there is a hidden node around the user equipment.
  • the reason is that the target cell also measures the wireless condition of the target unlicensed frequency band in the measurement time set. Obtain the measurement results. Comparing the measurement result measured by the target cell with the measurement result reported by the user equipment can determine whether there is a hidden node around the user equipment. Therefore, after the target cell sends the indication information to the user equipment, The indication information indicates that the user equipment reports the measurement result to the target cell, and therefore, the following steps can also be performed:
  • the radio condition may include performing, by the user equipment, physical measurement based on the target unlicensed frequency band or spectrum analysis or spectrum sensing. Or detecting the channel state of the target frequency band, where the measurement or detection may include, for example, energy sensing or energy detection, covariance matrix detection, and matched filter detection (Matched Filter Detection). ), Cyclostationary Feature Detection, eigenvalue based spectrum sensing, Received Signal Strength Indication (RSSI), Interference Measurement (Interference Measurement), Thermal Noise Climbing ( Rise Over Thermal (ROT), etc.
  • RSSI Received Signal Strength Indication
  • Interference Measurement Interference Measurement
  • ROT Rise Over Thermal
  • the measurement results reported by the user equipment may also be received by other network side devices.
  • the network side device is as described above, and will not be described here. That is to say, in addition to the measurement result reported by the user, the target cell may receive the measurement result from the base station to which the target cell belongs, or may receive the measurement result from other cells of the same base station as the target cell.
  • the indication information sent by the target cell to the user equipment indicates the measurement time set, so the user equipment may determine the measurement time set according to the indication information, and then measure the wireless condition of the target unlicensed frequency band in the measurement time set to obtain the measurement result.
  • the measurement result is reported to the target cell. Therefore, the target cell receives the measurement result reported by the user equipment.
  • the target cell may determine a radio condition of the target frequency band according to the measurement result reported by the user equipment, where the radio condition may include a physical measurement or spectrum analysis or spectrum sensing related measurement or the like by the user equipment based on the target unlicensed frequency band or Detecting the channel state of the target frequency band, where the measurement or detection may include, for example, energy sensing or energy detection, covariance matrix detection, and Matched filter detection. Cyclostationary Feature Detection Detection), eigenvalue based spectrum sensing, Received Signal Strength Indication (RSSI), Interference Measurement, and Rise Over Thermal (ROT) .
  • RSSI Received Signal Strength Indication
  • ROT Rise Over Thermal
  • the radio condition is an interference measurement as an example, that is, both the target cell and the user equipment measure the energy information on the target unlicensed frequency band in the measurement time set, which may also be referred to as RSSI-like. information.
  • the measurement result reported by the user equipment to the target cell may be used to assist the target cell to determine the hidden node of the user equipment.
  • the method for determining, by the target cell, the hidden node of the user equipment is: the target cell is obtained according to the measurement result reported by the user equipment, and the wireless condition that the target cell measures the target frequency band in the measurement time set. As a result of the measurement, it is determined whether a hidden node of the user equipment exists on the target frequency band.
  • the target cell receives the measurement result reported by the user equipment, and the target cell further measures the radio condition of the target unlicensed band within the measurement time set, and the target cell itself also obtains a measurement result. Then, the measurement result obtained by the target cell is compared with the measurement result reported by the user equipment, thereby determining the hidden node of the user equipment.
  • the target cell may determine that there is a hidden node around the user equipment. Otherwise, you can judge that there are no hidden nodes.
  • the target cell may also directly use the measurement result of the user equipment to compare with a specific energy threshold.
  • the specific energy threshold may be the target cell determination. Whether the target unlicensed band can use the energy detection threshold or signal detection threshold. For example, if the measurement result sent by the user equipment is higher than a specific energy threshold, and the serving cell is within the measurement time set, if it is determined that the target frequency band can be occupied in the measurement time set, the serving cell is detected in the measurement time set.
  • the energy threshold is lower than the specific energy threshold, so the network side device can measure according to the user equipment.
  • the specific energy threshold can be a CCA threshold.
  • the method when the target cell determines that the hidden node of the user equipment exists on the target frequency band, the method further includes: ending, by the target cell, data transmission with the user equipment; or After the start time, the target cell shortens the time of data transmission in the target frequency band.
  • the target cell determines that there is a hidden node around the user equipment, the signal sent by the hidden node to the user equipment may interfere with the signal sent by the target cell to the user equipment, so in order to improve the data communication quality between the target cell and the user equipment.
  • the target cell may end the data transmission with the user equipment, and then re-determine the time when the data is sent to the user equipment, and send the data to the user equipment at other times.
  • the target cell can shorten the time of data transmission with the user equipment, and minimize the interference time of the signal sent by the hidden node hidden node to the user equipment to the signal sent by the target cell to the user equipment.
  • the target cell can also shorten the data transmission time in the target unlicensed frequency band. In this way, the data transmission potentially transmitted by the hidden node can be protected, that is, the efficiency of the hidden node data transmission is protected.
  • the measurement result reported by the user equipment to the target cell may also assist the target cell to perform carrier selection.
  • the measurement time set is mainly located in a time interval in which the target cell does not send data
  • the obtained measurement result does not include the influence of the target cell transmission signal, and thus the measurement result It can reflect the load condition of the target frequency band. For example, if the energy value reflected by the energy result is relatively small, it indicates that the target frequency band is lightly loaded; otherwise, the target frequency band is heavier.
  • the load condition of the target frequency band reflected by the measurement result may be used to assist the target cell or the network side device to select a target frequency band with a light load as the working frequency, thereby improving data transmission efficiency.
  • the measurement time set is a time period before the start time of the target cell transmitting data in the target unlicensed frequency band and the predetermined condition is met. Therefore, the user equipment and the target cell measure the target unlicensed frequency band in the measurement time set. Measurement results obtained by wireless conditions, respectively The channel state that the user equipment experiences after transmitting the data to the user equipment is similar, thereby improving the accuracy of the target node to determine the hidden node, and overcoming the prior art that the target cell determines the hidden node for a long time, or the target cell is in the target cell. Defects in hidden nodes can only be determined after the moment the data is actually sent.
  • an embodiment of the present invention provides an apparatus for determining channel quality.
  • FIG. 9 is a schematic diagram of a first module of an apparatus for determining channel quality according to an embodiment of the present invention.
  • the meanings and specific implementations of the terms related to the apparatus for determining the channel quality shown in FIG. 9 can be referred to the aforementioned descriptions of FIGS. 1 to 8 and the embodiments.
  • the device may be a user equipment as described above, and the device comprises: a determining unit 301 and a measuring unit 302.
  • a determining unit 301 configured to determine a measurement time set of the target frequency band, where the target frequency band is an operating frequency of the target cell, where the measurement time set is before the start time of the target cell sending data in the target frequency band and the predetermined time is met Time period of conditions;
  • the measuring unit 302 is configured to measure a wireless condition of the target frequency band within the measurement time set to obtain a measurement result.
  • the starting time is determined by the target cell after the LBT evaluation after the first listening.
  • the time period that satisfies the predetermined condition is adjacent to the starting time.
  • the time period that meets the predetermined condition includes:
  • M, N, S, and K are all positive integers.
  • the time period that meets the predetermined condition includes:
  • the time period that meets the predetermined condition includes:
  • the first predetermined time interval includes a time occupied by a channel reservation signal transmitted by the target cell in the target frequency band during a time period before the first predetermined time interval.
  • the time period that meets the predetermined condition includes:
  • the second predetermined time interval is a time at which the target cell receives uplink data during a time period after the second predetermined time interval.
  • the user equipment measures the radio condition of the target frequency band in the measurement time set, including:
  • the user equipment measures energy of the target frequency band within the set of measurement time.
  • the measuring unit is used for at least one of the following:
  • the energy of the target frequency band is measured in units of listening time slots of the user equipment.
  • reporting unit is further configured to:
  • the measurement result is reported in a third predetermined time interval after the start time, where the third predetermined time interval is not greater than a time required by the user equipment to report channel state information to the target cell.
  • FIG. 10 is a schematic diagram of a first structure of an apparatus for determining channel quality according to an embodiment of the present invention.
  • the means for determining channel quality may be a user equipment as described above, the apparatus comprising: a transmitter 1001, a processor 1002, and a memory 1003.
  • the processor 1002 is configured to determine a measurement time set of the target frequency band, where the target frequency band is an operating frequency of the target cell, where the measurement time set is before the start time of the target cell sending data in the target frequency band and meets a predetermined schedule. a time period of the condition; and is further configured to measure a wireless condition of the target frequency band within the measurement time set to obtain a measurement result.
  • the starting time is determined by the target cell after the LBT evaluation after the first listening.
  • the time period that satisfies the predetermined condition is adjacent to the starting time.
  • the time period that meets the predetermined condition includes:
  • M, N, S, and K are all positive integers.
  • the time period that meets the predetermined condition includes:
  • the time period that meets the predetermined condition includes:
  • the first predetermined time interval includes a time occupied by a channel reservation signal transmitted by the target cell in the target frequency band during a time period before the first predetermined time interval.
  • the time period that meets the predetermined condition includes:
  • the second predetermined time interval is a time at which the target cell receives uplink data during a time period after the second predetermined time interval.
  • the processor 1002 is further configured to: measure energy of the target frequency band within the measurement time set.
  • the processor 1002 is configured to use at least one of the following:
  • Measuring the target in units of listening time slots of the user equipment within the measurement time set The energy of the standard frequency band.
  • the transmitter 1001 is configured to:
  • the measurement result is reported in a third predetermined time interval after the start time, where the third predetermined time interval is not greater than a time required by the user equipment to report channel state information to the target cell.
  • bus 1000 can include any number of interconnected buses and bridges, and bus 1000 will include one or more processors and memory 1003 represented by processor 1002. The various circuits of the memory are connected together.
  • the bus 1000 can also connect various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein.
  • Bus interface 1004 provides an interface between bus 1000 and transmitter 1001.
  • Transmitter 1001 may be a transceiver that provides means for communicating with various other devices on a transmission medium.
  • the processor 1002 is responsible for managing the bus 1000 and the usual processing, and the memory 1003 can be used to store data used by the processor 1002 when performing operations.
  • FIG. 11 is a schematic diagram of a second module of an apparatus for determining channel quality according to an embodiment of the present invention.
  • the device may be a target cell as described above, and the device includes: a sending unit 401, an evaluating unit 402, a first determining unit 403, a second determining unit 404, a first receiving unit 405, a second receiving unit 406, and a third The determining unit 407, the fourth determining unit 408, and the data transmitting unit 409.
  • the sending unit 401 is configured to send an indication message to the user equipment, where the indication message indicates a target frequency a measurement time set of the segment, the target frequency band is an operating frequency of the target cell, and the measurement time set is a time period before the start time of the target cell sending data in the target frequency band and the predetermined condition is met, And causing the user equipment to measure a wireless condition of the target frequency band within the measurement time set, and obtain a measurement result;
  • the evaluating unit 402 is configured to perform the LBT evaluation after the first listening, and obtain the evaluation result.
  • the first determining unit 403 is configured to determine the starting time according to the evaluation result.
  • the second determining unit 404 is configured to determine a random backoff number, where the random backoff number is determined before the target cell starts the idle channel assessment, and the time period that satisfies the predetermined condition is located in the random backoff number. The time period corresponding to the time.
  • the sending unit 401 is further configured to:
  • the time period satisfying the predetermined condition is a time period before the first predetermined time interval
  • the first predetermined time interval is the channel reservation signal Occupied time
  • the first receiving unit 405 is configured to receive uplink data before the start time, where the time period that satisfies the predetermined condition is a time period after the second predetermined time interval, and the second predetermined time interval Time for receiving the uplink data for the target cell.
  • the second receiving unit 406 is configured to receive the measurement result reported by the user equipment
  • the third determining unit 407 is configured to determine a radio condition of the target frequency band according to the measurement result.
  • the fourth determining unit 408 is configured to determine, according to the measurement result reported by the user equipment, and the measurement result obtained by the target cell measuring the radio condition of the target frequency band in the measurement time set. Whether the hidden node of the user equipment exists on the target frequency band.
  • the data transmission unit 409 is further configured to:
  • the target cell After the start time, the target cell shortens the data transmission time in the target frequency band.
  • FIG. 12 is a schematic diagram of a second structure of an apparatus for determining channel quality according to an embodiment of the present invention.
  • the device for determining the channel quality may be the target cell as described above, and the device includes: a transmitter 1201, a processor 1202, a memory 1203, and a receiver 1204.
  • the transmitter 1201 is configured to send, to the user equipment, an indication message, where the indication message indicates a measurement time set of the target frequency band, where the target frequency band is an operating frequency of the target cell, and the measurement time set is the target cell in the And a time period before the start time of the data transmission of the target frequency band and the predetermined condition is met, so that the user equipment measures the wireless condition of the target frequency band within the measurement time set, and obtains a measurement result.
  • the processor 1202 is configured to perform an LBT evaluation after the first listening, and obtain an evaluation result; and configured to determine the starting time according to the evaluation result.
  • the processor 1202 is configured to determine a random backoff number, where the random backoff number is determined before the target cell initiates an idle channel assessment, where the time period that satisfies the predetermined condition is a time corresponding to the random backoff number. The time period inside.
  • the transmitter 1201 is further configured to:
  • the time period satisfying the predetermined condition is a time period before the first predetermined time interval
  • the first predetermined time interval is the channel reservation signal Occupied time
  • the receiver 1204 is configured to receive uplink data before the start time, where the time period that satisfies the predetermined condition is a time period after the second predetermined time interval, where the second predetermined time interval is The time at which the target cell receives the uplink data.
  • the receiver 1204 is further configured to receive the measurement result reported by the user equipment
  • the processor 1202 is configured to determine a wireless condition of the target frequency band according to the measurement result.
  • the processor 1202 is configured to determine the target according to the measurement result reported by the user equipment and the measurement result obtained by the target cell measuring the radio condition of the target frequency band in the measurement time set. Whether there is a hidden node of the user equipment on the frequency band.
  • the processor 1202 is configured to:
  • the target cell After the start time, the target cell shortens the data transmission time in the target frequency band.
  • bus 1200 can include any number of interconnected buses and bridges, and bus 1200 will include one or more processors and memory 1203 represented by processor 1202. The various circuits of the memory are connected together. Bus 1200 can also connect various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein.
  • Bus interface 1204 provides an interface between bus 1000 and receiver 1204 and transmitter 1201. Receiver 1204 and transmitter 1201 may be the same component, i.e., a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 1202 is responsible for managing the bus 1200 and the usual processing, while the memory 1203 can be used to store data used by the processor 1202 in performing the operations.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit or unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used. Combinations 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, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically 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 a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • a computer readable storage medium A number of instructions are included to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a ROM (Read-Only Memory), a RAM (Random Access Memory), a disk or an optical disk, and the like, which can store program codes. .

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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 de détermination de la qualité de canal, pour améliorer, à l'intérieur d'une plage de temps dans laquelle une station de base LTE ne transmet pas de données dans une bande de fréquences sans licence, la précision de la qualité de canal mesurée par un dispositif d'utilisateur desservi par la station de base LTE. Le procédé comprend les étapes suivantes : le dispositif d'utilisateur détermine un ensemble d'instants de mesurage d'une bande de fréquences cible, qui est la fréquence opérationnelle de la cellule cible, l'ensemble d'instants de mesurage étant une période de temps qui remplit des conditions prédéterminées et précède l'instant où la cellule cible commence à transmettre des données dans la bande de fréquences cible ; le dispositif d'utilisateur mesure les conditions sans fil de la bande de fréquences cible, dans l'ensemble d'instants de mesurage, afin d'obtenir le résultat de mesurage.
PCT/CN2015/087070 2015-08-14 2015-08-14 Procédé et dispositif de détermination de qualité de canal Ceased WO2017028045A1 (fr)

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