WO2020001367A1 - Procédé et dispositif de correction d'informations temporelles - Google Patents

Procédé et dispositif de correction d'informations temporelles Download PDF

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Publication number
WO2020001367A1
WO2020001367A1 PCT/CN2019/092139 CN2019092139W WO2020001367A1 WO 2020001367 A1 WO2020001367 A1 WO 2020001367A1 CN 2019092139 W CN2019092139 W CN 2019092139W WO 2020001367 A1 WO2020001367 A1 WO 2020001367A1
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Prior art keywords
time
information
instruction information
base station
terminal device
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English (en)
Chinese (zh)
Inventor
杨坤
高峰
于光炜
汲桐
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present application relates to the field of communications, and more particularly, to a method and apparatus for transmitting time offsets and correcting time information in the field of communications.
  • Wireless communication technology has been widely used in various scenarios. For example, motion control, discrete automation, distributed power system, etc. These new application scenarios have put new demands on communication systems. For example, low-latency and high-reliability communication (URLLC), high connection density (URL), and time synchronization that meet the industrial bus standard IEC61508 of the International Electrotechnical Commission (IEC).
  • URLLC low-latency and high-reliability communication
  • URL high connection density
  • IEC International Electrotechnical Commission
  • time synchronization means that the time system of the terminal equipment and the network equipment remains synchronized.
  • the time system can be understood as a time system operating in accordance with international standards, such as coordinated universal time (UTC), global navigation satellite system (global navigation satellite system, GNSS), etc., or a time system operating in accordance with private standards, such as a local area network Internally defined time system.
  • UTC coordinated universal time
  • GNSS global navigation satellite system
  • private standards such as a local area network Internally defined time system.
  • the accuracy of time synchronization required by terminal equipment is different.
  • special application scenarios such as industrial bus and power grid fault detection require the accuracy of time synchronization between multiple terminal equipment to reach ⁇ 1us.
  • the fifth generation (5G) mobile communication system puts forward a more stringent time synchronization requirement, requiring a time deviation of ⁇ 500ns.
  • the base station includes a clock module and a communication module, and the clock module communicates with an external clock source to obtain time information for correcting the time system of the clock module.
  • the communication module can guarantee the timing synchronization of the radio frames of the terminal equipment within the coverage area of a base station based on the specific radio frame structure and radio frame number. Due to the difference between the communication module and the clock module, there is an amount of time deviation between the wireless frame timing system and the time system of the clock module. As a result, a time deviation occurs during the time synchronization between the terminal device and the base station, which affects the high-precision time. Synchronize. Therefore, how to ensure the accuracy of the time synchronization between the terminal equipment and the base station is a problem that the industry needs to solve urgently.
  • the present application provides a method and device for correcting time information, which can reduce timing errors between a wireless frame timing system and an external clock time system, and improve the accuracy of time synchronization between a terminal device and a base station.
  • a communication method including: determining a time deviation amount before and after a clock update; and sending instruction information, the instruction information including the time deviation amount information.
  • a time offset is determined, and the time offset is a time offset between the times when a specific event occurs and recorded under different timing systems, that is, the first time recorded based on the first time coordinate system and the second time based The amount of deviation between the second moments recorded in the coordinate system, where the specific event may refer to an unambiguous event that occurs at the sending device, such as the transmission of a specific signal, the transmission of a specific data packet, a specific frame timing trigger, etc .;
  • the first moment is the occurrence time of the specific event in the first time coordinate system
  • the second moment is the occurrence time of the specific event in the second time coordinate system, the first time coordinate system and the second time coordinate system Different.
  • the first time coordinate system may be a coordinate system of a time system based on external clock timing
  • the second time coordinate system is a coordinate system based on a wireless frame timing system.
  • the time deviation is based on the first time and The timing deviation amount between the second moments based on the radio frame timing system.
  • the information of the time deviation amount ⁇ T is sent to the terminal device through the base station, and the terminal device corrects the time information according to the information of ⁇ T.
  • the base station may send the information of the time deviation amount ⁇ T between the radio frame timing system and the time system of the external clock to the terminal device.
  • the terminal device After receiving the information of ⁇ T, the terminal device corrects the time information according to the information of ⁇ T, performs addition or subtraction operation on the time information and the time deviation amount, and uses the operation result as new time information.
  • the time information of the terminal equipment can be updated in time to ensure the validity of the time information and reduce the timing error caused by the periodic update of the external clock, thereby improving the accuracy of the time synchronization between the terminal equipment and the base station.
  • the indication information is carried in a reference signal.
  • the sequence of the reference signal is generated according to the time offset amount
  • the sequence of the reference signal is time-frequency resource mapped according to the time offset.
  • the method of sending the instruction information by using the reference signal can use the unicast or multicast message of the base station to send the instruction information to the terminal device, so that the method of sending the instruction information is more flexible; meanwhile, it can also affect the period of the cell broadcast transmission time information.
  • the time information of the terminal device is corrected in time to ensure the validity of the reference time, thereby achieving time synchronization with the base station.
  • the indication information is carried in downlink control information DCI, a media access control unit MAC CE, or radio resource control RRC signaling.
  • sending instruction information includes:
  • the indication information is sent.
  • the method further includes: sending second instruction information, where the second instruction information includes time granularity information for indicating a time deviation amount.
  • time granularity may be a type of information used to characterize time units or time accuracy, and the time granularity information may be pre-configured or predefined by a protocol.
  • the base station sends the information of ⁇ T to the terminal device, and the terminal device corrects the time information according to the information of ⁇ T.
  • the base station may send the information of the timing deviation amount ⁇ T accumulated between the radio frame timing system and the time system of the external clock to the terminal device.
  • the base station may carry the indication information including the information of ⁇ T in the reference signal, for example, the time offset contained in the indication information is used as an input parameter of the sequence of generating the reference signal or the resource mapping process, so that the terminal The device obtains the time offset information from the received reference signal; or the base station can send the time offset to the terminal device through DCI, MAC, CE, or RRC signaling.
  • the terminal device After receiving the instruction information, the terminal device corrects time information according to the obtained ⁇ T information, performs addition or subtraction operation on the time information and the time deviation amount, and uses the operation result as new time information.
  • the timing error between the wireless frame timing system and the external clock can be reduced, thereby improving the accuracy of time synchronization between the terminal device and the base station.
  • a communication method including: receiving instruction information, the instruction information including information used to indicate an amount of time deviation before and after a clock update; and correcting time information according to the instruction information.
  • the technical solution provided in this application receives the time deviation information sent by the base station through the terminal device, and corrects the time information according to the information of ⁇ T, which can update the time information of the terminal device in time, ensure the validity of the reference time, and reduce the external clock cycle
  • the timing error caused by the performance update improves the accuracy of the time synchronization between the terminal device and the base station.
  • the indication information is carried in a reference signal.
  • the sequence of the reference signal is generated according to the time offset amount
  • the sequence of the reference signal is time-frequency resource mapped according to the time offset.
  • the indication information is carried in downlink control information DCI, a media access control unit MAC CE, or radio resource control RRC signaling.
  • correcting the time information according to the instruction information includes:
  • the terminal device may modify the time of the time system of the clock module according to the instruction information; or modify the time derived under the wireless frame timing system according to the instruction information; or modify the calculation result in the time synchronization process according to the instruction information .
  • the method further includes: sending second instruction information, where the second instruction information includes information used to indicate a time granularity of the time deviation amount.
  • a communication device has a function of implementing a network device (for example, a base station) in the method design of the first aspect.
  • a network device for example, a base station
  • These functions can be implemented by hardware, or they can be implemented by hardware to execute corresponding software.
  • the hardware or software includes one or more units corresponding to the functions described above.
  • a communication device has a function of implementing a terminal device in the method design of the second aspect.
  • These functions can be implemented by hardware, or they can be implemented by hardware to execute corresponding software.
  • the hardware or software includes one or more units corresponding to the functions described above.
  • a network device including a transceiver and a processor.
  • the network device further includes a memory.
  • the processor is used to control the transceiver to send and receive signals
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program from the memory, so that the network device executes the first aspect or any one of the first aspect Method in implementation.
  • a terminal device including a transceiver and a processor.
  • the terminal device further includes a memory.
  • the processor is used to control the transceiver to send and receive signals
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program from the memory, so that the terminal device executes the second aspect or any one of the second aspect.
  • a communication system includes the network device of the third aspect and the terminal device of the fourth aspect; or the system includes the network device of the fifth aspect and the terminal device of the sixth aspect.
  • a communication device may be a network device designed in the foregoing method, or a chip provided in the network device.
  • the communication device includes a processor coupled to a memory, and may be configured to execute instructions in the memory to implement the first aspect or a method implemented by a network device in any possible implementation manner of the first aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication interface may be a transceiver, or an input / output interface.
  • the communication interface may be an input / output interface.
  • the transceiver may be a transceiver circuit.
  • the input / output interface may be an input / output circuit.
  • a communication device may be a terminal device designed in the foregoing method, or a chip provided in the terminal device.
  • the communication device includes a processor, which is coupled to the memory and can be used to execute instructions in the memory to implement the method described by the terminal device in the second aspect or any possible implementation manner of the second aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication interface may be a transceiver, or an input / output interface.
  • the communication interface may be an input / output interface.
  • the transceiver may be a transceiver circuit.
  • the input / output interface may be an input / output circuit.
  • a computer program product includes: computer program code that, when the computer program code runs on a computer, causes the computer to execute the methods in the above aspects.
  • a computer-readable medium stores program code, and when the computer program code runs on a computer, the computer causes the computer to execute the methods in the foregoing aspects.
  • FIG. 1 is a schematic architecture diagram of a mobile communication system applicable to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of an example of time synchronization between a base station and a terminal device according to an embodiment of the present application.
  • FIG. 3 is a timing diagram of two types of time reference frames provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of fluctuations of deviations under two types of time reference frames provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a method for correcting time information according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of an example resource mapping method for a reference signal according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of an example communication device according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of another example communication device according to an embodiment of the present application.
  • FIG. 9 is a schematic diagram of an example of a network device according to an embodiment of the present application.
  • FIG. 10 is a schematic diagram of another example of a terminal device according to an embodiment of the present application.
  • LTE long term evolution
  • FDD frequency division duplex
  • LTE time division duplex LTE time division duplex
  • 5G 5th generation
  • NR new wireless
  • FIG. 1 is a schematic architecture diagram of a mobile communication system applicable to an embodiment of the present application.
  • the mobile communication system 100 may include a radio access network device 110 and at least one terminal device (such as the terminal device 120 and the terminal device 130 in FIG. 1).
  • the terminal device is wirelessly connected to the wireless access network device.
  • Terminal equipment can be fixed or removable.
  • FIG. 1 is only a schematic diagram.
  • the communication system may further include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in FIG. 1.
  • the embodiments of the present application do not limit the number of radio access network devices and terminal devices included in the mobile communication system.
  • the radio access network device 110 is an access device that the terminal device accesses to the mobile communication system through wireless means.
  • the radio access network device 110 may be: a base station, an evolved base station (eNB), a home base station, an access point (AP) in a wireless fidelity (WIFI) system, and A relay node, a wireless backhaul node, a transmission point (TP), or a transmission and reception point (TRP), etc., can also be a gNB in an NR system, or it can be a component or part of a base station.
  • Equipment such as a central unit (CU), a distributed unit (DU), or a baseband unit (BBU).
  • the wireless access network device is referred to as a network device.
  • the network device refers to a wireless access network device.
  • a network device may refer to the network device itself, or a chip applied to a network device to perform a wireless communication processing function.
  • the terminal equipment in the mobile communication system 100 may also be referred to as a terminal, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), and the like.
  • the terminal device in the embodiment of the present application may be a mobile phone, a tablet, a computer with a wireless transmitting and receiving function, or may be applied to virtual reality (VR), augmented reality (AR) ), Industrial control (industrial control), driverless (self driving), remote medical (remote medical), smart grid (grid), transportation safety (transportation safety), smart city (smart city) and smart home (smart home) ) And other scenarios.
  • the aforementioned terminal devices and chips applicable to the aforementioned terminal devices are collectively referred to as terminal devices. It should be understood that the embodiment of the present application does not limit the specific technology and specific device form used by the terminal device.
  • the network device 110 in FIG. 1 may serve as a centralized controller for the terminal devices 120 and 130, and provide a time synchronization source for the terminal devices 120 and 130, that is, send time information to the terminal devices 120 and 130, so that the terminal devices 120 and 130 in the cell and
  • the network device 110 maintains time synchronization and indirectly meets the time synchronization requirement between the terminal devices 120 and 130.
  • a base station is used as a network device, and time synchronization between the base station and a terminal device is taken as an example for detailed description.
  • a base station is used as a master clock node
  • a terminal device is used as a slave clock node
  • the method in the embodiment of the present application can also be used in a more diverse network topology structure.
  • time synchronization between the base station and the terminal device it can also be applied to other application scenarios, such as device-to-device (D2D) application scenarios involving time synchronization.
  • D2D device-to-device
  • the master clock node is a terminal device
  • the clock node is also a terminal device
  • the method in the embodiment of the present application may also be used to implement time synchronization. This application is not limited to this.
  • the base station may periodically send time information to the terminal device through a system information block (SIB), for example, may send time information through SIB 16.
  • SIB system information block
  • the time information of the time system of the external clock of the base station is represented as T ref
  • T ref may represent a specific point in time during the operation of the base station (for example, the start or end boundary of the SI window where the SIB16 message is located).
  • the indicated time information, and T ref is the timing under the time system of the clock module of the base station.
  • T ref may be time information of UTC and GNSS, or time information operating according to a private standard, such as time information defined within a local area network. This application includes but is not limited to this.
  • the granularity of the system message sent by the base station is 10 milliseconds (ms), and the configurable sending period is 80 ms to 5120 ms.
  • ms milliseconds
  • the configurable sending period is 80 ms to 5120 ms.
  • different application scenarios may require different terminal devices with different time synchronization accuracy and different time synchronization cycles. Therefore, this time synchronization method of sending time information through system messages cannot target different terminals.
  • Equipment needs to provide high-precision time synchronization services.
  • IEEE 1588 defines a precision time protocol (PTP). Its basic function is to enable distributed communication networks to have strict timing synchronization. , The function of time synchronization can be achieved by means of application layer data packet interaction.
  • IEEE1588 is a master-slave synchronization system, which can be equivalent to a master clock node as a cell base station and a slave clock node as a terminal device. For example, during the time synchronization process between the base station and the terminal device, the base station periodically issues sync messages to the terminal device, and simultaneously records the time T 1 at which the base station sends the sync message, and sends the time stamp information including T 1 to the terminal.
  • the terminal device obtains the relevant synchronization message and timestamp information T 1 through the message interaction with the base station, and records the time T 2 when the sync message is received; the terminal device sends a delay response message to the base station And records the time T 3 when the delay response message is sent; the base station records the time T 4 when the delay response message is received, and sends the time stamp information including T 4 to the terminal device.
  • the terminal device After packet exchange process described above, the terminal device to obtain a T 1, 2, T 3, T T 4 to time information, and according to 1, T 2, 3 between time T 4 of the terminal apparatus and the base station computing T T, Offset or delay. Specifically, it can be calculated by formulas (1-a) and (1-b).
  • offset is used to indicate the time deviation between the terminal device and the base station, that is, the time deviation between the master clock node and the slave clock node; delay is used to indicate the transmission time deviation of the wireless signal from the base station to the terminal device.
  • the terminal device can adjust the time information of the terminal device according to the calculated offset or delay to achieve time synchronization with the base station.
  • the above process is a time synchronization scheme designed for the application layer of the wired system.
  • wireless communication systems need to introduce the time synchronization technology in the IEEE1588 protocol.
  • the terminal when using the time synchronization technology in the IEEE1588 protocol for high-precision time synchronization, the terminal needs to obtain the time information of the sending time T 1 of the sync message for each synchronization process. It should be understood that T 1 here is relative to T ref , the base station records the moment of sending the sync message.
  • the time information T ref of the time system of the base station is carried in SIB 16, but SIB 16 is a broadcast message, and the sending time of SIB 16 cannot be directly used as the time T 1 when a sync message is sent to a specific terminal.
  • the terminal device can derive T 1 according to T ref and the radio frame timing.
  • the sending time of the derived synchronization message is denoted as T 1 ′, that is, the time information T ref of the time system of the base station clock module is regarded as wireless.
  • the time reference point of the frame is obtained by formula (2) T 1 ′.
  • T ref is the time information of the reference point under the time system of the clock module
  • n is the number of time units from the reference point at the time of transmission
  • n is a positive integer
  • n can be predefined by the system or protocol
  • n can also be
  • the terminal device is configured by the base station through high-level signaling; or n may also be notified to the terminal device by the base station through physical layer signaling.
  • the physical layer signaling may be downlink control information (DCI). This application does not limit the manner of obtaining n.
  • t is the length of time corresponding to a time unit.
  • the time unit may be a radio frame, or a subframe, or a time slot, or an orthogonal frequency division multiplexing (OFDM) symbol.
  • One radio frame corresponds to 10 ms
  • one subframe corresponds to 1 ms
  • one LTE time slot corresponds to 0.5 ms.
  • the length of an NR time slot is determined by the subcarrier interval, which is not limited in this application.
  • T ref can be carried in a system broadcast message or in a multicast or unicast message.
  • recording the moment when the base station sends the sync message is equivalent to recording the moment corresponding to the start boundary or the end boundary of the time unit corresponding to the sync message.
  • the moments when a base station sends a signal, or when a terminal device sends or receives a signal are recorded using this standard.
  • the time corresponding to the start or end boundary of the time unit corresponding to the sync message can be understood as the time corresponding to the start subframe, start slot, or start symbol, or the end subframe, end slot. Or the moment corresponding to the end symbol. This application is not limited to this.
  • T 1 ′ can be used to calculate the offset according to formula (1-a), or according to formula (1 -b) to calculate the delay, and correct the time information of the terminal device according to the offset or delay, so as to achieve time synchronization with the base station.
  • ⁇ T T 1 -T 1 ′.
  • the cause of the deviation ⁇ T between T 1 ′ and T 1 is analyzed below.
  • FIG. 2 is a schematic diagram of time synchronization between a base station and a terminal device in a wireless communication system.
  • the base station includes at least two modules, an external clock module 201 and a communication module 202.
  • the external clock module 201 of the base station can communicate with an external clock source and periodically obtain time information from an external clock source, such as time information of UTC or GNSS, or time information of a time system running by a private standard, used to calibrate the time of the base station. System time information.
  • the terminal device also includes two modules, a clock module 203 and a communication module 204.
  • the clock module 203 cannot directly obtain the time information of the external clock, and needs to communicate with the communication module 202 of the base station through the communication module 204, and further based on the external of the base station.
  • the time information of the time system of the clock module 201 performs time synchronization.
  • the communication module 202 of the base station and the communication module 204 of the terminal device can communicate based on a typical communication protocol, for example, based on the 3rd Generation Partnership Project (3GPP) protocol for communication.
  • 3GPP 3rd Generation Partnership Project
  • timing systems in the base station there are two timing systems in the base station, one is an external clock time system, which performs timing according to a time system defined by an international standard, or performs timing according to a time standard defined by a local area network; and one is a wireless frame timing system. It is timed according to the radio frame number, time slot number, etc.
  • These two timing systems run on their own hardware modules, and there will inevitably be differences between the two. Specifically, the calibration of the external clock module 201 of the base station will cause a jump of the order of 100 nanoseconds (ns), and the radio frame of the radio frame timing system of the communication module 202 of the base station will always change continuously. As time goes on, the amount of deviation between the two timing systems will continue to accumulate.
  • the sampling frequency of the time system of the external clock and the sampling frequency of the wireless frame timing system of the communication module are also different.
  • the carrier frequency error requirement of the transmitted signal is specified to not exceed ⁇ 0.1 ppm.
  • the sampling frequency of the base station and the external clock frequency also have the same error requirement of ⁇ 0.1ppm
  • the frequency error range of the external clock module and the communication module should be within ⁇ 0.2ppm. As time goes on, the timing deviation caused by the frequency error will continue to increase.
  • the wireless frame length of the wireless communication system is 10ms
  • the external clock observation result on the wireless frame may be 10ms ⁇ 2ns .
  • the timing deviation caused by the difference in time granularity will continue to increase.
  • the timing system using an external clock is referred to as the time system of the clock module, and the timing system of the 3GPP communication system is referred to as the wireless frame timing system.
  • the sending time T 1 of the sync message derived by formula (2) ′ Is the timing result of the wireless frame timing system.
  • the sending time T 1 of the sync message recorded by the base station is the time recorded by the time system based on the clock module. There is a certain deviation between T 1 ′ and T 1 .
  • FIG. 4 is a schematic diagram of fluctuations in timing deviation between a time system of an external clock of a base station and a radio frame timing system.
  • the horizontal axis represents the time of the radio frame timing of the base station
  • the black solid line that rises upward indicates the amount of deviation caused by the frequency error
  • the step change of the solid black line indicates the change of the time deviation caused by the periodic calibration update of the time system of the base station and the external clock.
  • a base station determines a time offset ⁇ T of a wireless frame timing system and an external clock time system, and sends the time offset ⁇ T to a terminal device, and the terminal device corrects the time according to ⁇ T.
  • FIG. 5 is a schematic diagram of a method for correcting time information according to an embodiment of the present application. Taking the base station as the master clock node and the terminal device as the slave clock node, each step of the method 500 will be described in detail. It can be understood that the master clock node and the slave clock node may also be other communication devices, for example, the master clock node and the slave clock node may be different terminal devices.
  • the method 500 is described by using a terminal device and a base station as execution subjects.
  • the execution body of the method 500 may also be a chip applied to a terminal device and a chip applied to a base station.
  • the base station determines a time deviation amount before and after the clock is updated.
  • the amount of time deviation is the amount of deviation between the moments of the occurrence of a specific event under different timing systems, that is, the first moment recorded based on the first time coordinate system and the second moment recorded based on the second time coordinate system.
  • the amount of deviation between times where a specific event may refer to an unambiguous event that occurs at the base station, such as the transmission of a specific signal, the transmission of a specific data packet, the timing trigger of a specific frame (such as an empty frame), etc. It is the occurrence time of the specific event in the first time coordinate system, and the second time is the occurrence time of the specific event in the second time coordinate system, and the first time coordinate system is different from the second time coordinate system.
  • the first time coordinate system may be a coordinate system based on a time system of an external clock module
  • the second time coordinate system may be a coordinate system based on a wireless frame timing system.
  • the time offset is a second time frame based on the wireless frame timing system. The timing offset between the time and the first time based on the external clock.
  • the base station sends a first downlink signal to the terminal device, and records that the sending time of the first downlink signal is T 1 .
  • T 1 is the sending time of the first downlink signal in the first time coordinate system
  • T 1 ′ is the sending time of the first downlink signal in the second time coordinate system
  • the first time coordinate system and the second time coordinate The system is different, resulting in a deviation between T 1 and T 1 ′.
  • the sending of T ref can reuse the existing messages of the protocol, for example, using SIB 16 for sending; or using other radio resource control (RRC) messages, which is not limited in this application.
  • the reference time T ref is the time when the end frame boundary of the system information (SI) window of the SIB 16 sent by the base station reaches the transmitting antenna port.
  • the base station may send T ref periodically.
  • the sending period may be 80 ms to 5120 ms.
  • the first downlink signal here is a signal sent by the base station for the terminal device, such as a synchronization signal, a reference signal, a data message, and other forms. The form of the first downlink signal is not limited in this application.
  • the base station transmits a first downlink timing signal to the terminal device at time T 1, respectively, the first terminal device receives a downlink signal transmitted from the base station, the terminal device may record the received first downlink signal T 2.
  • a first downlink transmission timing signal T 1 is a base station for an external system clock time (a first time frame) as a reference time of the record;
  • the terminal apparatus receives the downlink signal of the first time T 2 is also the time recorded based on the time system of the clock module of the terminal device.
  • ⁇ T includes an accumulated time deviation amount caused by an external clock module jump variable and a clock frequency deviation.
  • the time information T ref of the time system of the clock module of the base station at the latest reference point may be used as a reference for calculation; or after the latest time deviation amount ⁇ T old is corrected
  • Time information Calculate the amount of time deviation this time as a reference point time reference. Specifically can be based on Calculate the amount of time deviation this time.
  • Current time information When the accuracy is not high, you can use ⁇ T old High-precision information.
  • the SIB16 message indicates The accuracy is on the order of 10ms, and the time deviation represented by ⁇ T old is 0.001ms, which can be corrected according to ⁇ T old New It is 10.001ms.
  • ⁇ T old is taken as High-precision part of the time information.
  • the base station sends instruction information, where the instruction information includes information used to indicate the time deviation amount.
  • the base station sends the indication information including the information of the time deviation amount to the terminal device, the terminal device receives the indication information, and determines the time deviation amount by using the indication information.
  • the base station sends second instruction information, and the second instruction information includes information used to indicate a time granularity of the time deviation amount.
  • the time granularity may be a type of information used to characterize time units or time accuracy, and the time granularity information may be pre-configured or predefined by a protocol. For example, the base station and terminal equipment agree in advance that the time deviation is calculated with a granularity of 100ns. Or, the time granularity information may be dynamically configured, and the time granularity may be dynamically adjusted as needed. Such a configuration method may save bit overhead.
  • the second instruction information herein may be a part of the foregoing information indicating the time deviation amount, or may be sent separately from the foregoing instruction information.
  • the indication information is carried in a reference signal.
  • the reference signal may be multiplexed with an existing downlink reference signal, or a dedicated reference signal may be used.
  • a dedicated reference signal may be used.
  • CRS cell-specific reference signals
  • DMRS demodulation reference signals
  • multicast single frequency reference signals multimedia, broadcast, service, single frequency, network reference signal, MBSFN, RS
  • positioning Reference signals positioning reference signals, PRS
  • channel state information reference signals channel reference information, CSI-RS
  • the instruction information includes information used to indicate the amount of time deviation.
  • the time deviation included in the instruction information can be used as a reference signal generation or resource mapping process. Input parameters, so that the terminal device obtains information on the amount of time deviation from the received reference signal. The following specifically enumerates three methods for carrying the indication information in a reference signal and sending the indication information to a terminal device.
  • the sequence of the reference signal is generated based on the amount of time deviation.
  • the time deviation amount may be a parameter of a sequence generation function of the reference signal. It should be understood that it is necessary to realize that the time deviation amount is involved in the sequence of generating the reference signal, that is, the time deviation amount is involved in the calculation process of the sequence generation.
  • the base station can select the generation of the reference signal sequence r (m) according to the time offset, such as
  • L is the granularity of the time deviation
  • m is the index of the element in the sequence
  • x seq represents the function of generating the sequence of the reference signal
  • [ ⁇ T / L] represents the function of rounding ⁇ T based on the granularity L.
  • the rounding method is possible But it is not limited to rounding down, rounding up or rounding.
  • the base station may further perform phase rotation processing on the sequence of the reference signal according to the time deviation amount as shown in formula (4).
  • r (m) is the sequence of the original reference signal
  • r '(m) is the sequence of the reference signal after phase rotation processing
  • m represents the index of the element in the sequence
  • ⁇ and C are fixed constants, which are defined by the protocol, and N Fast Fourier transform (FT) size.
  • the sequence of the reference signal is time-frequency resource mapped according to the time offset.
  • corresponding processing can be performed according to formula (5).
  • a k, l represents the content carried on the k-th resource element (RE) on the l-th symbol;
  • ⁇ is a constant, which indicates the power level;
  • f mapping (m; ⁇ T) and g mapping (m; ⁇ T) Is a function of resource mapping, and the time offset is a parameter in the mapping function.
  • the reference signal carrying the indication information may be time-division multiplexed or frequency-division multiplexed with other reference signals.
  • the RS used to carry ⁇ T occupies a part of resources of other reference signals, so that ⁇ T is transmitted to the terminal device.
  • the other reference signals herein may be tracking reference signals (TRS).
  • the terminal device may use a corresponding detection algorithm to obtain the time included in the indication information when receiving the RS bearing the ⁇ T. The amount of deviation.
  • the above two methods can be used to carry the indication information into the reference signal. Whether the sequence of the reference signal is generated based on the time offset, or the time-frequency resource mapping is performed based on the time offset, after the terminal device receives the reference signal,
  • the instruction information can be obtained by detecting the reference signal, so as to determine the amount of time deviation.
  • the method of transmitting the information including the amount of time deviation by using the reference signal can use the multicast message of the base station to send the instruction information to the terminal device, so that the method of transmitting the instruction information is more flexible; meanwhile, it can also affect the period of the cell broadcast transmission time information. In the case of time, correct the time information of the terminal device in time to ensure the validity of the reference time, thereby achieving time synchronization with the base station.
  • the instruction information is carried in downlink control information DCI, a medium access control unit (MAC, CE), or radio resource control RRC signaling.
  • DCI downlink control information
  • MAC medium access control unit
  • RRC radio resource control
  • the required response time is sequentially increased.
  • the response time required for DCI to carry ⁇ T information is the shortest, and the response time required for RRC signaling to carry ⁇ T information is the longest; and for the degree of protocol modification, DCI to carry ⁇ T information is The degree of modification is the largest, and the information carried by RRC signaling carries the smallest degree of modification to the protocol. Therefore, in the actual application process, considering the timeliness of the time offset and the degree of modification to the protocol, it can be considered to send the time offset by using MAC CE.
  • DCI Downlink Control
  • MAC Downlink Control
  • CE Downlink Control
  • RRC Radio Resource Control
  • the base station may send the instruction information to the terminal device periodically. For example, a certain transmission period may be configured for the base station, or the base station may select an appropriate detection period in combination with its own hardware conditions, and periodically send indication information including a time deviation amount to the terminal device.
  • the period at which the base station detects the time offset and sends the time offset may be different.
  • the base station may detect the time deviation amount at a predetermined time, but the time deviation amount is transmitted according to a certain period, which is not limited in this application.
  • the base station may notify the terminal device to start receiving the instruction information through high-level signaling, and the terminal device receives the instruction information according to a pre-configured period; the base station may also notify the terminal device to stop receiving the instruction information through high-level signaling.
  • the high-level signaling can reuse the activation message and the deactivation message of the time synchronization function, respectively.
  • the base station when the time deviation is greater than or equal to a preset first threshold, the base station sends the indication information to the terminal device.
  • the base station dynamically selects whether to send the indication information according to the size of ⁇ T: the base station determines a first threshold. When the value of ⁇ T is greater than or equal to the first threshold, that is, the time synchronization result may not meet the current demand, the base station sends ⁇ T The information is used for the terminal device to correct the time information.
  • the first threshold may be a constant preset by the protocol, or a constant determined by a time synchronization accuracy requirement.
  • the terminal device corrects time information according to the instruction information.
  • the terminal device After receiving the instruction information, the terminal device corrects the time information according to the instruction information.
  • the terminal device may obtain a time offset according to the instruction information; perform addition or subtraction operations on the time information and the time offset, and use the operation result as new time information.
  • the terminal device can implement the connection with the base station by modifying the time information of the time system, or correcting the downlink signal transmission time calculated by the wireless frame timing system, or modifying the calculation result of the foregoing formula (1-a) or (1-b).
  • Time synchronization Listed as follows:
  • the terminal device corrects the time of the time system of the clock module
  • the terminal device corrects the time information of the reference point of the time system of the clock module according to the time deviation amount. For example, the terminal device may modify the time information T ref of the time system according to ⁇ T, and may modify it according to formula (6).
  • the terminal device will Time information as a new reference point for the time system of the clock module. It is the time information of the reference point of the time system of the clock module transmitted by the latest base station.
  • the terminal equipment corrects the downlink signal transmission time calculated under the wireless frame timing system
  • the terminal device corrects the time of the wireless frame timing system according to the amount of time deviation. For the first downlink signal, it is to modify the time of the estimated transmission time of the first downlink signal. Specifically, the terminal device may modify the sending time T 1 ′ of the first downlink signal timed in the wireless frame timing system according to formula (7),
  • the offset is calculated according to formula (1), or the delay is calculated according to formula (1-b), so as to further complete the time synchronization process.
  • the terminal device corrects the time synchronization calculation result according to the time deviation amount. For example, after receiving the instruction information, the terminal device first saves the obtained time deviation amount ⁇ T, and after obtaining the time information of T 3 and T 4 , adds ⁇ T as correction information directly to the time synchronization calculation formula. Specifically, during the time synchronization between the terminal device and the base station, the terminal device can calculate the time offset offset according to formulas (1-a) and (2), taking into account the effect of the time offset amount ⁇ T, and then correct the offset according to ⁇ T. Specifically passed Make corrections, and perform time synchronization between the terminal device and the base station according to [offset] modify .
  • delay can be understood as [offset] modify to advance or lag the time deviation of the time system of the terminal device clock module.
  • this application does not limit the manner in which the terminal device modifies the time information of the wireless frame timing system according to ⁇ T.
  • the purpose is to allow the terminal device to update the time information through the correction of ⁇ T to avoid the external clock module jumping and clock frequency deviation.
  • the resulting cumulative time deviation affects time synchronization, thereby achieving time synchronization between the terminal device and the base station.
  • T 2 , T 3, and T are required. 4 time information.
  • T 2 is the time when the terminal device receives the synchronization message
  • T 3 is the time when the terminal device sends a delay response message. Both of these time information are clearly known by the terminal device.
  • the time information of T 4 is sent by the base station to the terminal device, and there may be multiple transmission forms, which are not listed here one by one. For example, the base station records the time T 4 when the terminal device receives the delay response message, and sends T 4 to the terminal device by using the method of sending ⁇ T listed in the embodiments of the present application.
  • the ⁇ T information is sent to the terminal device through the base station, and the terminal device corrects the time information according to the ⁇ T information.
  • the base station may send the information of the timing deviation amount ⁇ T accumulated between the radio frame timing system and the time system of the external clock to the terminal device.
  • the base station may carry the indication information including the information of ⁇ T in the reference signal, for example, the time offset contained in the indication information is used as an input parameter of the sequence of generating the reference signal or the resource mapping process, so that the terminal The device obtains the time offset information from the received reference signal; or the base station can send the time offset to the terminal device through DCI, MAC, CE, or RRC signaling.
  • the terminal device After receiving the instruction information, the terminal device corrects time information according to the obtained ⁇ T information, performs addition or subtraction operation on the time information and the time deviation amount, and uses the operation result as new time information.
  • the timing error between the wireless frame timing system and the external clock can be reduced, thereby improving the accuracy of time synchronization between the terminal device and the base station.
  • FIG. 7 shows a schematic block diagram of a communication apparatus 700 according to an embodiment of the present application.
  • the apparatus 700 may correspond to (for example, be applicable to or be itself) the base station described in the method 500, and each module in the apparatus 700
  • the OR units are respectively used to perform various actions or processing processes performed by the base station in the above method 500.
  • the communication device 700 may include a processing unit 710 and a communication unit 720.
  • the processing unit 710 is configured to determine a time deviation amount before and after the clock is updated.
  • the communication unit 720 is configured to send instruction information, and the instruction information includes information used to indicate the amount of time deviation.
  • the processing unit 710 is used to execute S501 in method 500
  • the communication unit 720 is used to execute S502 in method 500.
  • the specific process of each unit performing the above corresponding steps has been described in detail in method 500. For simplicity, in I won't go into details here.
  • FIG. 8 shows a schematic block diagram of a communication apparatus 800 according to an embodiment of the present application.
  • the apparatus 800 may correspond to (for example, be applicable to or be itself) the terminal device described in the method 500, and each of the apparatus 800 The modules or units are respectively used to perform various actions or processing processes performed by the terminal device in the above method 500.
  • the communication device 800 may include a communication unit 810 and a processing unit 820.
  • the communication unit 810 is configured to receive instruction information that includes information used to indicate an amount of time deviation before and after a clock update.
  • the processing unit 820 is configured to correct the time information according to the instruction information.
  • the communication unit 810 is used to execute S502 in method 500
  • the processing unit 820 is used to execute S503 in method 500.
  • the specific process of each unit performing the above corresponding steps has been described in detail in method 500. For simplicity, in I won't go into details here.
  • FIG. 9 is a schematic structural diagram of a communication device 900 according to an embodiment of the present application.
  • the communication device 900 (for example, a base station) includes a processor 910 and a transceiver 920.
  • the communication device 900 further includes a memory 930.
  • the processor 910, the transceiver 920, and the memory 930 communicate with each other through an internal connection path to transfer control and / or data signals.
  • the memory 930 is used to store a computer program, and the processor 910 is used to call from the memory 930.
  • the computer program is run to control the transceiver 920 to send and receive signals.
  • the processor 910 is configured to execute a program code stored in the memory 930 to implement a function of a base station in the foregoing method embodiment.
  • the memory 930 may also be integrated in the processor 910, or be independent of the processor 910.
  • the transceiver 920 may be implemented by means of a transceiver circuit.
  • the above communication device 900 may further include an antenna 940 for sending downlink data or downlink control signaling output by the transceiver 920 through a wireless signal, or sending uplink data or uplink control signaling to the transceiver 820 for further processing after receiving.
  • the communication device 900 may correspond to a base station in the method 500 according to the embodiment of the present application, and the device 900 may also be a chip or a component applied to a base station.
  • each module in the device 900 implements the corresponding process in the method 500 in FIG. 5.
  • the memory 930 is used to store program code, so that the processor 910 controls the processor 910 to execute the program code when the program code is executed.
  • the S501 in the method 500 is executed, and the transceiver 920 is used to perform the S502 in the method 500.
  • the specific process for each unit to perform the above corresponding steps has been described in detail in the method 500. For the sake of brevity, no further description is provided here.
  • FIG. 10 is a schematic structural diagram of a communication device 1000 according to an embodiment of the present application.
  • the communication device 1000 includes a processor 1010 and a transceiver 1020.
  • the communication device 1000 further includes a memory 1030.
  • the processor 1010, the transceiver 1020, and the memory 1030 communicate with each other through an internal connection path to transfer control and / or data signals.
  • the memory 1030 is used to store a computer program, and the processor 1010 is used to call from the memory 1030.
  • the computer program is run to control the transceiver 1020 to send and receive signals.
  • the processor 1010 is configured to execute program code stored in the memory 1030 to implement functions of the terminal device in the foregoing method embodiment.
  • the memory 1030 may also be integrated in the processor 1010 or independent of the processor 1010.
  • the transceiver 1020 may be implemented by means of a transceiver circuit.
  • the above communication device 1000 may further include an antenna 1040 for sending uplink data or uplink control signaling output by the transceiver 1020 through a wireless signal, or sending downlink data or downlink control signaling to the transceiver 1020 for further processing.
  • the device 1000 may correspond to the terminal device in the method 500 according to the embodiment of the present application, and the device 1000 may also be a chip or a component applied to the terminal device.
  • each module in the device 1000 implements a corresponding process in the method 500 in FIG. 5.
  • the memory 1030 is used to store program code, so that the processor 1010 controls the processor 1010 to The method S503 is performed, and the transceiver 1020 is configured to perform S502 in the method 500. The specific process of each unit performing the corresponding steps is described in the method 500 in detail.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are only schematic, and the division of the units is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined.
  • the displayed or discussed mutual coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices, or units.
  • the functional units in the embodiments of the present application may be integrated into one physical entity, or each unit may correspond to a physical entity, or two or more units may be integrated into one physical entity.
  • the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially a part that contributes to the existing technology or a part of the technical solution can be embodied in the form of a software product.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application.
  • the aforementioned storage media include: U disks, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks, and other media that can store program codes .

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Abstract

La présente invention concerne un procédé et un dispositif de correction d'informations temporelles, le procédé comprenant les étapes suivantes : une station de base détermine un décalage temporel précédant et suivant une mise à jour d'horloge, et envoie des informations d'indication comprenant le décalage temporel à un dispositif terminal, la station de base pouvant spécifiquement configurer un signal de référence pour transporter les informations d'indication comprenant les informations cibles, par exemple, à l'aide du décalage temporel compris dans les informations d'indication en tant que paramètre d'entrée pour un processus de génération ou de mappage de ressources d'une séquence de signaux de référence, de telle sorte que le dispositif terminal obtient des informations concernant le décalage temporel à partir du signal de référence reçu ; et le dispositif terminal effectue une correction d'informations temporelles selon le décalage temporel. Le procédé peut être utilisé pour réduire une différence de synchronisation entre un système de synchronisation de trame sans fil et un système de synchronisation d'horloge externe, et améliorer la précision de synchronisation temporelle entre le dispositif terminal et la station de base.
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