WO2021056295A1 - 时间同步方法及相关设备 - Google Patents

时间同步方法及相关设备 Download PDF

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Publication number
WO2021056295A1
WO2021056295A1 PCT/CN2019/107967 CN2019107967W WO2021056295A1 WO 2021056295 A1 WO2021056295 A1 WO 2021056295A1 CN 2019107967 W CN2019107967 W CN 2019107967W WO 2021056295 A1 WO2021056295 A1 WO 2021056295A1
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WIPO (PCT)
Prior art keywords
time synchronization
synchronization information
terminal
network device
propagation delay
Prior art date
Application number
PCT/CN2019/107967
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English (en)
French (fr)
Inventor
付喆
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to PCT/CN2019/107967 priority Critical patent/WO2021056295A1/zh
Priority to CN201980094226.3A priority patent/CN113574940B/zh
Publication of WO2021056295A1 publication Critical patent/WO2021056295A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • This application relates to the field of communication technology, and in particular to a time synchronization method and related equipment.
  • time synchronization is required between the terminal and the network side, such as a base station, to achieve reliable data transmission.
  • the terminal When performing synchronization, the terminal performs synchronization calibration by acquiring a timing advance (Timing Advance, TA).
  • TA Timing Advance
  • the embodiments of the present application provide a time synchronization method and related equipment, which can realize time synchronization based on propagation delay compensation, which helps to improve the accuracy of time synchronization, and thereby improves the reliability of data transmission.
  • an embodiment of the present application provides a time synchronization method, including:
  • the terminal receives a dedicated message from a network device, where the dedicated message includes first time synchronization information, and the first time synchronization information is used to indicate compensation for propagation delay;
  • the terminal performs time synchronization with the network device according to the first time synchronization information.
  • an embodiment of the present application provides a time synchronization method, including:
  • the network equipment determines the propagation delay compensation
  • the network device sends a dedicated message to the terminal, where the dedicated message includes first time synchronization information, and the first time synchronization information is used to indicate a propagation delay compensation situation.
  • an embodiment of the present application provides a terminal, which has part or all of the functions of implementing the behavior of the terminal in the foregoing method.
  • the function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units or modules corresponding to the above-mentioned functions.
  • the terminal may include a processing unit and a communication unit, and the processing unit is configured to support the terminal to perform corresponding functions in the foregoing method.
  • the communication unit is used to support communication between the terminal and other devices.
  • the terminal may also include a storage unit, which is used to couple with the processing unit and stores programs (instructions) and data necessary for the terminal.
  • the processing unit may be a processor
  • the communication unit may be a transceiver
  • the storage unit may be a memory.
  • the embodiments of the present application provide a network device, which has part or all of the functions of implementing the behavior of the network device in the foregoing method.
  • the function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units or modules corresponding to the above-mentioned functions.
  • the network device may include a processing unit and a communication unit, and the processing unit is configured to support the network device to perform corresponding functions in the foregoing method.
  • the communication unit is used to support communication between the network device and other devices.
  • the network device may further include a storage unit for coupling with the processing unit, which stores programs (instructions) and data necessary for the network device.
  • the processing unit may be a processor
  • the communication unit may be a transceiver
  • the storage unit may be a memory.
  • an embodiment of the present application provides a terminal, including a processor, a memory, a transceiver, and one or more programs, wherein the one or more programs are stored in the memory and are configured by The processor executes, and the program includes instructions for executing the steps in any method of the first aspect of the embodiments of the present application.
  • embodiments of the present application provide a network device, including a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured by The processor executes, and the program includes instructions for executing the steps in any method in the second aspect of the embodiments of the present application.
  • an embodiment of the present application provides a communication system, which includes the terminal and/or network device of the foregoing aspect.
  • the system may also include other devices that interact with the terminal or network device in the solution provided in the embodiments of the present application.
  • an embodiment of the present application provides a computer-readable storage medium, the computer-readable storage medium stores a computer program, and the computer program causes a computer to execute the method described in the first aspect of the embodiments of the present application Some or all of the steps.
  • an embodiment of the present application provides a computer-readable storage medium that stores a computer program that causes a computer to execute the method described in the second aspect of the embodiment of the present application Some or all of the steps.
  • an embodiment of the present application provides a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute Part or all of the steps described in the method of the first aspect of the application embodiment.
  • the computer program product may be a software installation package.
  • an embodiment of the present application provides a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute such as Part or all of the steps described in the method of the second aspect of the embodiments of the present application.
  • the computer program product may be a software installation package.
  • the terminal can realize the time synchronization between the terminal and the network device by receiving a dedicated message carrying time synchronization information sent by the network device, and based on the propagation delay compensation indicated by the time synchronization information, so that It can meet low latency requirements and achieve high time synchronization accuracy, which in turn helps to improve the reliability of data transmission.
  • Fig. 1a is an architecture diagram of a communication system provided by an embodiment of the present application.
  • FIG. 1b is an architecture diagram of a TSN system provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a time synchronization accuracy error provided by an embodiment of the present application
  • FIG. 3 is a schematic flowchart of a time synchronization method provided by an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of another time synchronization method provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of interaction of a time synchronization method provided by an embodiment of the present application.
  • FIG. 6 is an interactive schematic diagram of another time synchronization method provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of interaction of yet another time synchronization method provided by an embodiment of the present application.
  • FIG. 8 is an interactive schematic diagram of yet another time synchronization method provided by an embodiment of the present application.
  • FIG. 9 is a schematic diagram of interaction of yet another time synchronization method provided by an embodiment of the present application.
  • FIG. 10 is a schematic diagram of interaction of yet another time synchronization method provided by an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a terminal provided by an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a network device provided by an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of another terminal provided by an embodiment of the present application.
  • Fig. 14 is a schematic structural diagram of another network device provided by an embodiment of the present application.
  • Time Sensitive Network (TSN) systems, Time Sensitive Communication (TSC) systems, and the 5th Generation (5G) of mobile communications.
  • TSN Time Sensitive Network
  • TSC Time Sensitive Communication
  • 5G 5th Generation
  • the system is also called a New Radio (NR) system, a Long Term Evolution (Long Term Evolution, abbreviated: LTE) system, etc.
  • NR New Radio
  • LTE Long Term Evolution
  • Fig. 1a is an architecture diagram of a communication system provided by this application.
  • the communication system may include: one or more network devices 101, and one or more terminals 102.
  • Fig. 1a only shows one network device 101 and one terminal 102 as an example.
  • Data transmission can be performed between the network device 101 and the terminal 102.
  • time synchronization between the terminal 102 and the network device 101 needs to be performed.
  • the network device 101 can indicate the propagation delay compensation situation by sending a broadcast message and/or a dedicated message to the terminal 102, so that the terminal 102 can according to the propagation delay compensation situation indicated by the broadcast message and/or dedicated message , To synchronize time with network devices. This can realize time synchronization based on propagation delay compensation, help improve time synchronization accuracy, and can provide lower delay guarantees, meet the low delay requirements, and further improve the reliability of data transmission.
  • the system needs to ensure higher time synchronization accuracy.
  • TSN system may include TSN bridge (TSN bridge or TSN bridge), device side (Device) TSN conversion device (TSN Translator), 5G system (5GS), network side bridge (Network side of Bridge) And TSN system (TSN System).
  • the TSN bridge may be End Station (terminal station, terminal station, end station, etc.); the 5GS may include terminals such as User Equipment (UE), (R) AN (namely access network AN, Access Network ; Or radio access network RAN, Radio Access Network, access and mobility management (Access and Mobility Management Function, AMF) entities, session management function (Session Management Function, SMF) entities, unified data management (Unified Data Management, UDM) entities, User Plane Function (UPF) entities, Policy and Charging Function (PCF) entities, Network Exposure Function (NEF) entities and other network elements; the Network side of Bridge may include control plane (CP) TSN conversion equipment such as application functions (Network Exposure Function, AF) and user plane (UP) TSN conversion equipment; the TSN System may include TSN Centralized User Configuration (GUC), TSN Centralized Network Configuration (CNC), TSN bridge and other network elements.
  • UE User Equipment
  • R Radio Access Network
  • AMF Access and Mobility Management Function
  • SMF Session Management Function
  • the (R)AN may include a network device such as a base station, and the device-side TSN Translator and the UE are network elements in a device-side bridge (Device side of Bridge).
  • the 5G Industrial Internet Industrial Internet of Things, IIoT
  • IIoT needs to support the transmission of services such as Industrial Automation (Factory Automation), Transmission Automation (Transport Industry), and Intelligent Power (Electrical Power Distribution) in 5G systems.
  • IIoT introduces the concept of time-sensitive network TSN network or TSC.
  • the 5G network can be used as the TSN bridge to provide services for the TSN network and services through the 5G network. Therefore, the 5G system needs to ensure higher clock synchronization accuracy, for example, it needs to meet the 1us time synchronization accuracy requirement, so that when these services are transmitted in the 5G network, the operation and connection of each point of the mechanical operation are accurate.
  • the time synchronization accuracy error can be controlled within a certain range to meet the synchronization accuracy requirements, such as ensuring that the TSN service meets the 1us time synchronization accuracy requirements when transmitting in 5G.
  • the terminal before performing the time synchronization mode of this application, or based on the terminal determined by this application that does not require propagation delay compensation, the terminal can synchronize by acquiring the TA.
  • the terminal has different ways to obtain TA in the idle state and the connected state. For example, when the terminal is in the idle state or inactive state, the time synchronization with the network side may not be maintained, and the terminal can go through the random access (RA) process.
  • RA random access
  • the TA is acquired, for example, the TA is determined based on the TAC (TA command, TA command) acquired from the RAR message, so as to perform synchronization based on the TA.
  • the terminal can obtain the TA according to the TAC sent by the network side such as the network device, for example, instruct the TA command through the TAC MAC CE to perform synchronization based on the TA.
  • the uplink frame transmission advance is (N TA + N TA offset ) ⁇ T c .
  • N TA is related to TA command.
  • the index given in the TA command can be the index adjusted by the timing advance.
  • N TA T A ⁇ 16 ⁇ 64/2 ⁇
  • the value of N TA offset can be determined according to the cell frequency band used for uplink transmission, for example, it can be 25600, 0, 39936, 13792 T C. For systems with different Sub Carrier Spacing (SCS), the synchronization accuracy requirements can be different.
  • SCS Sub Carrier Spacing
  • the synchronization accuracy requirements are within ⁇ 256Tc; for systems with SCS 60kHz, the synchronization accuracy requirements are within Within ⁇ 128Tc; for a system with SCS of 120kHz, the synchronization accuracy is required to be within ⁇ 32Tc, and so on.
  • the network device may be an entity on the network side that is used to send or receive information, such as a base station.
  • the base station may be used to communicate with one or more terminals, or it may be used to communicate with one or more terminals.
  • a base station with partial terminal functions performs communication (for example, communication between a macro base station and a micro base station, such as communication between access points).
  • the base station can be a base transceiver station (Base Transceiver Station, BTS), it can also be an evolved base station (Evolutional Node B, eNB) in a Long Term Evolution (LTE) system, or it can be a 5G system or an NR system.
  • Base station gNB etc., not listed here.
  • the network device 101 may also be a transmission point (TP), an access point (Access Point, AP), a transmission and receiver point (TRP), a relay device, and a central unit (Central Unit, CU). ), or other network equipment with base station functions, etc., which are not limited in this application.
  • TP transmission point
  • AP access point
  • TRP transmission and receiver point
  • CU central unit
  • CU central unit
  • a terminal is a device with a communication function, for example, it may be a vehicle-mounted device, a wearable device, a handheld device (such as a smart phone), and so on.
  • the terminal may also be called other names, such as user equipment (User Equipment, UE), user unit, mobile station (mobile station), mobile unit (mobile unit), terminal equipment, etc., which are not limited in this application.
  • time synchronization can also be referred to as synchronization, clock synchronization, etc., which is not limited in this application.
  • the time synchronization information may include time (time, such as time, minutes, seconds, and 10 nanoseconds), reference (System Frame Number, SFN), and so on.
  • the time synchronization information may also include uncertainty (undefined value), timeinfotype (time information type, such as whether it is local time), and so on.
  • the present application discloses a time synchronization method and related equipment.
  • the terminal can realize time synchronization based on propagation delay compensation, thereby helping to improve the reliability of data transmission.
  • FIG. 3 is a schematic flowchart of a time synchronization method provided by an embodiment of the present application.
  • the method of this embodiment can be applied to the aforementioned communication system, and can be specifically applied to the sending end such as the aforementioned terminal. As shown in Figure 3, the method includes:
  • a terminal receives a dedicated message from a network device, where the dedicated message includes first time synchronization information, and the first time synchronization information is used to indicate compensation for propagation delay.
  • the dedicated message may be a dedicated radio resource control (Radio Resource Control, RRC) message, a dedicated media access control (Media Access Control, MAC) message, or a dedicated downlink control information (Downlink Control Information, DCI) and so on.
  • RRC Radio Resource Control
  • MAC Media Access Control
  • DCI Downlink Control Information
  • the compensation situation may include compensated propagation delay or uncompensated propagation delay. That is to say, the time synchronization information used to indicate the compensation situation of the propagation delay may refer to: the compensation situation is that the propagation delay has been compensated.
  • the time synchronization information includes synchronization information that compensates for the propagation delay, or it is called,
  • the time synchronization information is time synchronization information that compensates for the propagation time delay; or, the compensation situation is that the propagation time delay is not compensated, and the time synchronization information (or dedicated message) is used to instruct the terminal to compensate for the propagation time delay.
  • the terminal performs time synchronization with the network device according to the first time synchronization information.
  • the network device can indicate the propagation delay compensation to the terminal by sending a dedicated message carrying the first time synchronization information to the terminal, and then the terminal can perform time synchronization with the network device according to the first time synchronization information.
  • the compensation situation is that the propagation delay has been compensated.
  • the first time synchronization information is time synchronization information that compensates for the propagation delay, that is, network-side compensation can be realized.
  • the compensation situation is that the propagation delay is not compensated.
  • the terminal can use the first time synchronization information (dedicated message) Instructs to perform propagation delay compensation (propagation delay compensation), that is, terminal-side compensation can be realized.
  • This terminal is a terminal with propagation delay compensation capability. That is, the terminal performs propagation delay compensation for the first time synchronization information, and performs time synchronization with the network device according to the compensated first time synchronization information. For example, after receiving the dedicated message, the terminal may perform communication with the network device according to the target propagation delay compensation value.
  • the terminal may communicate with the network device.
  • Time synchronization For example, after performing propagation delay compensation for the first time synchronization information according to the target propagation delay compensation value, the terminal may communicate with the network device. Time synchronization.
  • the target propagation delay compensation value may be preset, or may be notified by the network side such as a network device.
  • the propagation delay compensation value set in advance or notified by the network side may be multiple. If the propagation delay compensation value is multiple, the terminal can determine the target propagation delay compensation value from the multiple propagation delay compensation values, and perform communication with the network device according to the target propagation delay compensation value. Time synchronization. For example, the terminal may determine the target propagation delay compensation value from the multiple propagation delay compensation values according to the parameter value, and then perform propagation delay compensation for the first time synchronization information according to the target propagation delay compensation value, and then according to the compensated value The first time synchronization information is synchronized with the network device to realize propagation delay compensation through the terminal side.
  • the parameter value may include any one or more of the following: the distance between the terminal and the network device, the received power between the terminal and the network device, such as Reference Signal Received Power, RSRP), the path loss value between the terminal and the network device, the cell coverage parameter corresponding to the network device, and so on.
  • the corresponding relationship between the interval of parameter values (such as the above-mentioned distance, received power, path loss value, cell coverage parameter, etc.) and the multiple propagation delay compensation values can be set in advance, so as to quickly determine based on the corresponding relationship
  • the propagation delay compensation value corresponding to the parameter value is used as the target propagation delay compensation value.
  • the cell coverage parameter may include a cell radius and/or cell coverage area and/or the distance between the first location point and the second location point, etc.
  • the first location point and the second location point can be preset, Or it can be notified by the network side such as a network device.
  • the terminal may also receive a broadcast message from the network device, and the broadcast message includes second time synchronization information, and the terminal may perform time synchronization with the network device according to the second time synchronization information. Synchronize.
  • the second time synchronization information may also be used to indicate the propagation delay compensation situation, for example, the compensation situation is that the propagation delay has been compensated, and the second time synchronization information is the time synchronization information that compensates for the propagation delay; or , The compensation situation is that the propagation time delay is not compensated, and the second time synchronization information is the time synchronization information that is not compensated for the propagation time delay.
  • the terminal may first receive the broadcast message, perform time synchronization with the network device according to the second time synchronization information, and then perform time synchronization with the network device according to the received dedicated message, that is, according to the second time synchronization information.
  • the time synchronization information and the first time synchronization information are synchronized separately (twice synchronization).
  • the terminal may determine the time synchronization information according to the first time synchronization information and the second time synchronization information.
  • the target time synchronization information for performing time synchronization with the network device can perform time synchronization with the network device according to the target time synchronization information. Further optionally, the terminal may also perform time synchronization with the network device according to the first time synchronization information when the first time synchronization information is different from the second time synchronization information. Otherwise, if the first time synchronization information is the same as the second time synchronization information, it can be deemed that the synchronization information has not changed, and synchronization processing is not performed, so as to save synchronization overhead. Or, regardless of whether the first time synchronization information is the same as the second time synchronization information, after receiving the first time synchronization information, the terminal performs time synchronization with the network device according to the first time synchronization information.
  • the terminal may also receive a broadcast message from the network device, the broadcast message includes second time synchronization information, and the terminal may further based on the first time synchronization information and the second time synchronization information, Perform time synchronization with the network device (one-time synchronization), for example, according to the first time synchronization information and the second time synchronization information, determine target time synchronization information for time synchronization with the network device, and then The terminal can perform time synchronization with the network device according to the target time synchronization information.
  • the broadcast message includes second time synchronization information
  • the terminal may further based on the first time synchronization information and the second time synchronization information, Perform time synchronization with the network device (one-time synchronization), for example, according to the first time synchronization information and the second time synchronization information, determine target time synchronization information for time synchronization with the network device, and then The terminal can perform time synchronization with the network device according to the target time synchronization information.
  • the second time synchronization information may also be used to indicate the propagation delay compensation situation, for example, the compensation situation is that the propagation delay has been compensated, and the second time synchronization information may be time synchronization information that compensates for the propagation delay; Alternatively, the compensation situation is that the propagation time delay is not compensated, and the second time synchronization information may be time synchronization information that is not compensated for the propagation time delay. That is, before synchronizing according to the target time synchronization information, the terminal does not perform time synchronization with the network device according to the second time synchronization information, that is, the terminal can obtain the second time synchronization information and the first time synchronization information after obtaining the second time synchronization information and the first time synchronization information. Synchronize together again (that is, synchronize only once), that is, synchronize directly according to the target time synchronization information, so as to save synchronization overhead by reducing the number of synchronizations.
  • the terminal determines that the target time synchronization information includes the first time synchronization information and the second time synchronization information, and the terminal may, after receiving the broadcast message and the dedicated message, respectively, according to the first time synchronization information and time synchronization information carried in the dedicated message
  • the second time synchronization information carried in the broadcast message performs time synchronization with the network device.
  • the terminal performs the operation according to the first time synchronization information.
  • the time synchronization with the network device may be performed according to the time indicated by the second time synchronization information and the time offset value.
  • the terminal may determine that the target time synchronization information includes the first time synchronization information, and then the terminal may communicate with the network device according to the first time synchronization information. Time synchronization between.
  • the time synchronization information involved in this application may be complete time information, or may be indication information used to indicate the complete time information, such as The time offset value between the time indicated by the time synchronization information (or the time synchronization information carried in the previous specific type of message such as the broadcast message).
  • This application does not limit the indication method of the time information corresponding to the time synchronization information .
  • the first time synchronization information and the second time synchronization information may be complete Time information.
  • the first time synchronization information may not be complete time information, such as
  • the first time synchronization information includes a time offset value from the time indicated by the second time synchronization information; for example, when synchronizing together according to a broadcast message and a dedicated message, the terminal can compare the time indicated by the second time synchronization information with the time indicated by the second time synchronization information.
  • the time offset value is used for time synchronization with the network device. Wherein, the time offset value can be a positive value, a negative value or zero.
  • the terminal when the terminal determines whether the time synchronization information, such as the above-mentioned first time synchronization information or the second time synchronization information, compensates for the propagation time delay, the terminal can use the indicator carried in the message (or time synchronization information) To determine whether compensation has been made. For example, when the time synchronization information is the time synchronization information that compensates for the propagation delay, the first indicator can be carried to indicate that the compensation is performed; and if the time synchronization information is the time synchronization information without compensation for the propagation delay, the first indicator can be carried. 2.
  • An indication mark to indicate that no compensation has been made another example is that it can indicate that compensation has been made by carrying an indication mark, or that no compensation has been made when the indication mark is not carried, etc., and this application is not limited.
  • the terminal determines whether the synchronization information compensates for the propagation delay, it can be as long as the synchronization information is carried to indicate that the propagation delay compensation is carried out, or only the dedicated message carries the time synchronization information to indicate that the compensation is carried out. , When it is empty, it indicates that it is not compensated.
  • the terminal after the terminal receives the broadcast message, if within a certain period of time (such as the first time) after receiving the broadcast message, the first time can be preset or notified by the network side Obtained)
  • the terminal can synchronize according to the time synchronization information carried in the broadcast message and the time synchronization information carried in the dedicated message.
  • the time synchronization information carried in the dedicated message is a time offset value.
  • the terminal can also perform propagation delay compensation by itself, such as determining the target propagation delay compensation value, according to the broadcast message
  • the carried time synchronization information is synchronized with the target propagation delay compensation value; or, the terminal can directly synchronize with the network device according to the time synchronization information carried in the broadcast message, regardless of whether propagation delay compensation is not considered.
  • the time synchronization information carried in the broadcast message may be time synchronization information that compensates for the propagation time delay, or it may be time synchronization information that has not compensated for the propagation time delay.
  • the terminal can realize the time synchronization between the terminal and the network device based on the propagation delay compensation indicated by the time synchronization information by receiving the dedicated message carrying the time synchronization information sent by the network device, so that it can meet the low time requirement. Delay requirements to achieve high time synchronization accuracy, which in turn helps to improve the reliability of data transmission.
  • FIG. 4 is a schematic flowchart of another time synchronization method provided by an embodiment of the present application.
  • the method in this embodiment can be specifically applied to the above-mentioned network equipment. As shown in FIG. 4, the method includes:
  • the network device determines to compensate for propagation delay.
  • the network device sends a dedicated message to the terminal, where the dedicated message includes first time synchronization information, and the first time synchronization information is used to indicate compensation for propagation delay.
  • the network device can detect whether to compensate for the propagation delay, and when determining to compensate for the propagation delay, send a dedicated message to the terminal.
  • the first time synchronization information carried in the dedicated message indicates the propagation delay compensation, so that the terminal can follow
  • the first time synchronization information indicating the propagation delay compensation situation is synchronized with the network device.
  • the dedicated message may be a dedicated RRC message, a dedicated MAC message, or a dedicated DCI, etc., which will not be repeated here.
  • the terminal may be a terminal whose parameter value meets corresponding conditions, and/or, the terminal is a terminal that does not have propagation delay compensation capabilities, and/or, the terminal is in a cell corresponding to the network device Terminal. That is to say, the network equipment can determine whether there are terminals that need propagation delay compensation in the corresponding cell, and when it is determined that there are terminals that need propagation delay compensation, the network equipment can determine the propagation delay compensation, and can determine whether the terminal needs to be compensated for propagation delay. The terminal sends the dedicated message.
  • the parameter value may include any one or more of the following: the distance between the terminal and the network device, the received power between the terminal and the network device, such as RSRP, and the path loss between the terminal and the network device Value, the cell coverage parameter corresponding to the network device.
  • the parameter value that satisfies the corresponding conditions may include any one or more of the following: the distance between the terminal and the network device is greater than the distance threshold, the received power between the terminal and the network device is less than the power threshold, and the distance between the terminal and the network device is less than the power threshold.
  • the path loss value of is greater than the loss threshold, the cell coverage parameter corresponding to the network device is greater than the coverage threshold, and so on.
  • the cell coverage parameter corresponding to the network device is greater than or equal to the coverage threshold, and/or the network device has a propagation delay compensation capability.
  • the network device can also detect whether the corresponding cell coverage parameter is greater than or equal to the corresponding preset threshold, and/or the network device has the propagation delay compensation capability, and when it detects that the cell coverage parameter is greater than or equal to the corresponding preset threshold, And/or, when the network device has the propagation delay compensation capability, the propagation delay compensation is determined to be performed, and the dedicated message can be sent to the terminal.
  • the cell coverage parameter may include the cell radius and/or the cell coverage and/or the distance between the first location point and the second location point in the cell.
  • the first location point and the second location point can be preset or set by the network.
  • the side notification for example, the first location point is the location point A where the terminal is located, and the second location point is the cell center.
  • Whether the cell coverage parameter is greater than or equal to the corresponding preset threshold may refer to: whether the cell radius is greater than or equal to the radius threshold, and/or whether the cell coverage is greater than or equal to the coverage threshold, and/or, the first location point and the second The distance between the two location points, such as whether the distance from the location point A to the cell center is greater than or equal to the corresponding threshold, and so on.
  • the dedicated message can be sent to all terminals in the cell, or the dedicated message can be sent to some terminals such as the terminals determined in the foregoing manner.
  • the compensation situation is that the propagation delay has been compensated.
  • the first time synchronization information is time synchronization information that compensates for the propagation delay, so that network-side compensation can be realized.
  • the network device when it determines to perform propagation delay compensation, it may also determine the propagation delay compensation value, and determine the first time synchronization information according to the propagation delay compensation value.
  • the propagation delay compensation value may be preset, or may be determined according to a preset rule.
  • the network device may also determine the propagation delay compensation value according to the parameter value, and then determine the first time synchronization information (dedicated message) according to the propagation delay compensation value.
  • the parameter value may include any one or more of the following: the distance between the terminal and the network device, the received power between the terminal and the network device, such as RSRP, and the path loss between the terminal and the network device Value, the cell coverage parameter corresponding to the network device, etc.
  • the corresponding relationship between the interval of parameter values (such as the above-mentioned distance, received power, path loss value, cell coverage parameter, etc.) and the multiple propagation delay compensation values can be set in advance, so as to quickly determine based on the corresponding relationship
  • the propagation delay compensation value corresponding to the parameter value is used as the target propagation delay compensation value.
  • the parameter values involved in determining the propagation delay compensation value by the aforementioned terminal may be the same or different. This application is not limited.
  • the compensation situation is uncompensated propagation delay
  • the first time synchronization information may be time synchronization information without propagation delay compensation
  • the terminal is a terminal with propagation delay compensation capability. In this way, the terminal performs propagation delay compensation according to the instruction of the first time synchronization information (dedicated message), so that terminal-side compensation can be realized.
  • the network device may also send a broadcast message to the terminal, and the broadcast message may include the second time synchronization information.
  • the second time synchronization information may be time synchronization information that compensates for the propagation delay, or the second time synchronization information may be time synchronization information that does not compensate for the propagation delay (here, the network device may be required to use only dedicated messages
  • the time synchronization information that compensates for the propagation delay is sent, and the time synchronization information in the broadcast message does not include propagation delay compensation).
  • the second time synchronization information carried in the broadcast message is applicable to all terminals under the coverage of the network device, that is, applicable to all terminals in the cell corresponding to the network device.
  • the network device may also indicate to the terminal the compensation for the propagation delay through the second time synchronization information, which is similar to the first time synchronization information, and will not be repeated here.
  • the first time synchronization information may include a time offset value from the time indicated by the second time synchronization information. Therefore, the terminal can implement time synchronization with the network device according to the time offset value. For example, the terminal can perform time synchronization with the network device according to the time indicated by the second time synchronization information and the time offset value.
  • the network device may send a dedicated message carrying time synchronization information to the terminal when it is determined to perform propagation delay compensation, so that the terminal can realize the communication between the terminal and the network device based on the propagation delay compensation indicated by the time synchronization information.
  • the inter-time synchronization makes it possible to meet the low delay requirements and achieve higher time synchronization accuracy, which in turn helps to improve the reliability of data transmission.
  • FIG. 5 is a schematic diagram of interaction of a time synchronization method provided by an embodiment of the present application.
  • the network device can send a broadcast message carrying the second time synchronization information and a dedicated message carrying the first time synchronization information to the terminal, and the terminal can respectively according to the second time synchronization information and the first time synchronization information,
  • the time synchronization between the terminal and the network device is realized, and the first time synchronization information is used for propagation delay compensation.
  • the method may include:
  • a base station sends a broadcast message to a UE, where the broadcast message includes second time synchronization information.
  • the second time synchronization information may be synchronization information that compensates for propagation time delay, or may be synchronization information that does not compensate for propagation time delay.
  • the second time synchronization information may be time synchronization information that compensates for the propagation delay. If the base station determines to compensate the propagation delay for the UE's time synchronization information, the base station may use a broadcast message to notify the UE of the compensated time synchronization information.
  • the second time synchronization information indicated in the broadcast message is applicable to all UEs within the coverage area of the base station.
  • the UE performs time synchronization with the base station according to the second time synchronization information.
  • the UE After receiving the broadcast message, the UE can complete time synchronization with the base station according to the second time synchronization information notified in the broadcast message, such as adjusting the UE's local clock to be the same as the base station clock. For example, it is 9:10, the error does not exceed 10us.
  • the base station determines to perform propagation delay compensation.
  • the base station sends a dedicated message to the UE, where the dedicated message includes first time synchronization information, and the first time synchronization information is used to indicate a compensation for propagation delay.
  • the base station can use a dedicated message such as dedicated RRC to indicate the propagation delay compensation situation.
  • the base station determines to perform propagation delay compensation, which may be determined by determining whether there is a UE that needs to perform propagation delay compensation in the cell of the base station. For example, the base station may detect UEs whose distance from the base station is greater than the distance threshold, and/or UEs whose RSRP with the base station is less than the power threshold, and/or, the path loss between the base station and the base station is greater than the path loss threshold. When the UE, and/or, does not have a UE that performs propagation delay compensation by itself, etc., it is determined to perform propagation delay compensation.
  • the base station may only use the corresponding message to notify the time synchronization information that compensates for the propagation delay, for example, through the above-mentioned broadcast message to notify all UEs in the cell of the second time synchronization information that compensates for the propagation delay, and/or through dedicated The message notifies these UEs of the first time synchronization information that compensates for the propagation delay, and so on.
  • the base station determines to perform propagation delay compensation, which may be determined by detecting whether propagation delay compensation is required. For example, the base station can detect whether the cell coverage parameter of the base station is greater than or equal to the corresponding coverage threshold, such as whether the cell radius is greater than or equal to the radius threshold, and/or whether the cell coverage is greater than or equal to the coverage threshold, and/or, first Whether the distance between the location point and the second location point is greater than or equal to the corresponding threshold, etc., and when it is detected that the cell coverage parameter is greater than the corresponding coverage threshold, it is determined to perform propagation delay compensation.
  • the base station determines to perform propagation delay compensation, which may be determined by detecting whether propagation delay compensation is required. For example, the base station can detect whether the cell coverage parameter of the base station is greater than or equal to the corresponding coverage threshold, such as whether the cell radius is greater than or equal to the radius threshold, and/or whether the cell coverage is greater than or equal to the coverage threshold, and/or, first Whether the distance between the location point
  • the base station can send a broadcast message or a dedicated message to all UEs in the cell to notify the time synchronization information that compensates for the propagation delay; or the base station can further determine the UE that sends the dedicated message, such as the aforementioned UE that needs propagation delay compensation, Send a dedicated message to the determined UE.
  • the base station can determine the propagation delay compensation when it has the propagation delay compensation capability. Furthermore, the base station may send a broadcast message or a dedicated message to all UEs in the cell to notify the time synchronization information that compensates for the propagation delay; or the base station may further determine the UE that sends the dedicated message, and send the dedicated message to the determined UE.
  • the base station may also determine propagation delay compensation when the type of service (data) transmitted with the UE is a specified type, and then may send a dedicated message to the UE corresponding to the specified type.
  • the specified type may be a service with high synchronization accuracy requirements and/or a type of service (data) with high delay requirements, such as TSN/TSC service (data), which can be specifically set in advance.
  • the first time synchronization information carried in the dedicated message sent by the base station may be the same or different.
  • the base station may determine the propagation delay compensation value according to the corresponding parameter value for each UE, determine the first time synchronization information according to the determined propagation delay compensation value, and then send the first time synchronization information including the first time synchronization information to the corresponding UE.
  • Dedicated message may be the propagation delay compensation value according to the corresponding parameter value for each UE.
  • the UE performs time synchronization with the base station according to the first time synchronization information.
  • the UE When the UE performs time synchronization with the base station according to the first time synchronization information, it can optionally be based on whether the first time synchronization information includes compensation for the propagation delay, that is, whether the first time synchronization information compensates for the propagation delay Time synchronization information to determine the specific compensation method, such as determining whether it is network compensation, whether terminal compensation is required, etc., to synchronize. For example, the UE performs time synchronization with the base station completely according to the first time synchronization information, and considers that the propagation delay compensation has been completed after receiving the first time synchronization information contained in the dedicated message.
  • the UE performs time synchronization with the base station completely according to the first time synchronization information, regardless of whether the propagation delay is compensated or not.
  • the first time synchronization information is time synchronization information that compensates for the propagation delay, it is network compensation, and the UE can synchronize with the base station according to the first time synchronization information; if the first time synchronization information is uncompensated
  • the time synchronization information of the propagation delay can be compensated by the terminal, and the UE can synchronize with the base station according to the third time synchronization information such as the target propagation delay compensation value, that is, the terminal can propagate the received first time synchronization information by itself.
  • the manner of synchronization according to whether the second time synchronization information includes compensation for propagation delay is similar to the first time synchronization information, here Do not go into details.
  • the UE can synchronize with the base station (synchronize twice) according to the first time synchronization information and the second time synchronization information, respectively. For example, when the UE determines that the first time synchronization information is different from the second time synchronization information (for example, the time included in the time synchronization information, and/or the SFN is different), the UE may communicate with the base station according to the first time synchronization information. Time synchronization between. If the dedicated message is dedicated RRC, the UE can adjust the synchronization clock with the base station according to the time synchronization information indicated in the dedicated RRC (UE follow dedicated RRC).
  • the UE may discard the first time synchronization information and no longer perform synchronization according to the first time synchronization information to save synchronization overhead; or, the UE may not perform the first time synchronization information.
  • synchronization can be performed according to the first time synchronization information, thereby reducing the detection overhead and helping to improve synchronization reliability.
  • the first time synchronization information and the second time synchronization information may be complete time information, or may be incomplete time information such as a time offset value, etc., which will not be repeated here.
  • the first time synchronization information is a time offset value between the time indicated by the second time synchronization information, and the UE may synchronize with the base station according to the first time synchronization information.
  • the time indicated by the time synchronization information and the time offset value after determining the final time synchronization information, that is, the target time synchronization information, synchronize with the base station.
  • the UE when the UE receives the time synchronization information notified by the broadcast message, it can synchronize with the base station based on the notified time synchronization information; when the UE receives a dedicated message such as dedicated RRC time synchronization information, the UE determines the final time synchronization information It is: the synchronization clock corresponding to the time synchronization information in the broadcast message + the synchronization clock corresponding to the time synchronization information in the dedicated RRC. Assuming that the time synchronization information corresponding to the broadcast message is common value, and the time synchronization information corresponding to the dedicated message is offset, the final time synchronization information is common value+offset. Therefore, when the UE synchronizes with the base station according to the first time synchronization information, it can synchronize with the base station according to the final time synchronization information. This helps to reduce the signaling overhead of dedicated messages.
  • a dedicated message such as dedicated RRC time synchronization information
  • the base station can indicate the second time synchronization information by sending a broadcast message to the UE in the cell.
  • the UE in the cell can synchronize with the base station according to the second time synchronization information.
  • a dedicated message carrying the first time synchronization information is sent to the UE, so that the UE can achieve time synchronization between the UE and the base station based on the propagation delay compensation indicated by the first time synchronization information.
  • FIG. 6 is an interactive schematic diagram of another time synchronization method provided by an embodiment of the present application.
  • the network device can realize the time synchronization between the terminal and the network device by sending a broadcast message carrying the second time synchronization information and a dedicated message carrying the first time synchronization information to the terminal.
  • the first time synchronization Information is used to indicate propagation delay compensation.
  • the method may include:
  • the base station sends a broadcast message to the UE, where the broadcast message includes second time synchronization information.
  • the second time synchronization information may be synchronization information that compensates for propagation time delay, or may be synchronization information that does not compensate for propagation time delay.
  • the base station determines to perform propagation delay compensation.
  • the base station sends a dedicated message to the UE, where the dedicated message includes first time synchronization information, and the first time synchronization information is used to indicate a compensation for propagation delay.
  • the UE performs time synchronization with the base station according to the first time synchronization information and the second time synchronization information.
  • the UE may also perform time synchronization with the base station according to the first time synchronization information and the second time synchronization information. That is to say, the UE may not perform synchronization after receiving the second time synchronization information (broadcast message), but after receiving the first time synchronization information (dedicated message), it may then perform the synchronization according to the first time synchronization information and The second time synchronization information determines the final time synchronization information, that is, the target time synchronization information, and then synchronizes (synchronizes once).
  • the first time synchronization information and the second time synchronization information may be complete time information, or may be incomplete time information such as a time offset value, etc., which will not be repeated here.
  • the first time synchronization information may include a time offset value from the time indicated by the second time synchronization information, and then the UE is in accordance with the second time synchronization information and the first time synchronization information.
  • the base station is synchronized (one-time synchronization), it can synchronize with the base station according to the time indicated by the second time synchronization information and the time offset value.
  • the UE determines that the final time synchronization information is: the synchronization clock corresponding to the time synchronization information in the broadcast message + the time synchronization information corresponding to the dedicated RRC Synchronised clock.
  • the final time synchronization information is common value+offset. Therefore, the UE can synchronize with the base station according to the final time synchronization information, which helps reduce synchronization overhead.
  • the UE may not synchronize according to the second time synchronization information carried in the broadcast message. If the UE receives a dedicated message including the first time synchronization information within a certain time after receiving the broadcast message, the UE may synchronize with the base station according to the second time synchronization information and the first time synchronization information.
  • the UE can also perform propagation delay compensation by itself, such as determining the target propagation delay compensation value, according to the broadcast message
  • the carried time synchronization information and the target propagation delay compensation value are synchronized with the base station; alternatively, the UE can directly synchronize with the base station according to the second time synchronization information, regardless of whether the propagation delay is compensated or not.
  • the base station can indicate the second time synchronization information by sending a broadcast message to the UE in the cell, and the base station can also send a dedicated message carrying the first time synchronization information to the UE when determining to compensate for propagation delay.
  • the UE can realize the time synchronization between the UE and the base station based on the propagation delay compensation indicated by the first time synchronization information and the second time synchronization information. Through propagation delay compensation, the low delay requirements can be met and higher The accuracy of time synchronization, which in turn helps to improve the reliability of data transmission.
  • FIG. 7 is a schematic diagram of interaction of yet another time synchronization method provided by an embodiment of the present application.
  • the network device can implement time synchronization between the terminal and the network device by sending a dedicated message carrying the first time synchronization information to the terminal.
  • the first time synchronization information It includes the time synchronization information that compensates for the propagation delay, that is, the compensation situation indicated by the first time synchronization information is that the propagation delay has been compensated, and the propagation delay compensation is realized by the network side.
  • the method may include:
  • the base station sends a broadcast message to the UE, where the broadcast message includes second time synchronization information, and the second time synchronization information is synchronization information without compensation for propagation delay.
  • the base station may indicate time synchronization information, that is, the second time synchronization information, through a broadcast message, and the second time synchronization information does not include compensation for propagation delay.
  • the second time synchronization information indicated in the broadcast message is applicable to all UEs within the coverage area of the base station.
  • the UE performs time synchronization with the base station according to the second time synchronization information.
  • the UE After receiving the broadcast message, the UE can complete time synchronization with the base station according to the second time synchronization information notified in the broadcast message, such as adjusting the UE's local clock to be the same as the base station clock. For example, it is 9:10, the error does not exceed 10us.
  • the base station determines to perform propagation delay compensation.
  • the base station sends a dedicated message to the UE, where the dedicated message includes first time synchronization information, and the first time synchronization information is time synchronization information that compensates for propagation delay.
  • the base station can only use a dedicated message such as dedicated RRC to notify the UE of the compensated time synchronization information, that is, the propagation compensation is compensated.
  • a dedicated message such as dedicated RRC to notify the UE of the compensated time synchronization information, that is, the propagation compensation is compensated.
  • the time synchronization information of the time delay that is, the first time synchronization information.
  • the base station determines to perform propagation delay compensation, which may be determined by determining whether there is a UE that needs to perform propagation delay compensation in the cell of the base station. For example, the base station may detect UEs whose distance from the base station is greater than the distance threshold, and/or UEs whose RSRP with the base station is less than the power threshold, and/or, the path loss between the base station and the base station is greater than the path loss threshold. UEs, and/or UEs that do not have propagation delay compensation by themselves, etc., regard these UEs as UEs that need propagation delay compensation, that is, determine to perform propagation delay compensation. Furthermore, the base station may only use dedicated messages such as dedicated RRC to notify these UEs of the time synchronization information that compensates for the propagation delay, that is, the first time synchronization information.
  • dedicated messages such as dedicated RRC to notify these UEs of the time synchronization information that compensates for the propagation delay, that is, the first time synchronization information.
  • the base station determines to perform propagation delay compensation, which may be determined by detecting whether propagation delay compensation is required. For example, the base station may detect whether the cell coverage parameter of the base station is greater than or equal to the corresponding coverage threshold, and when detecting that the cell coverage parameter is greater than or equal to the corresponding coverage threshold, determine to perform propagation delay compensation. Furthermore, the base station may send a dedicated message to all UEs in the cell; or, the base station may further determine the UE that sends the dedicated message, such as the aforementioned UE that needs propagation delay compensation, and send the dedicated message to the determined UE.
  • propagation delay compensation may be determined by detecting whether propagation delay compensation is required. For example, the base station may detect whether the cell coverage parameter of the base station is greater than or equal to the corresponding coverage threshold, and when detecting that the cell coverage parameter is greater than or equal to the corresponding coverage threshold, determine to perform propagation delay compensation. Furthermore, the base station may send a dedicated message to all UEs in the cell; or, the base station may further
  • the base station may determine propagation delay compensation when it has the propagation delay compensation capability; and/or, when the type of service (data) transmitted with the UE is a specified type, determine the propagation time Delay compensation and determining the compensated UE are not repeated here.
  • the first time synchronization information carried in the dedicated message sent by the base station may be the same or different.
  • the base station may determine the propagation delay compensation value according to the corresponding parameter value for each UE, determine the first time synchronization information according to the determined propagation delay compensation value, and then send the first time synchronization information including the first time synchronization information to the corresponding UE.
  • Dedicated message may be the propagation delay compensation value according to the corresponding parameter value for each UE.
  • the UE performs time synchronization with the base station according to the first time synchronization information.
  • a UE that receives a dedicated message containing the first time synchronization information can perform time synchronization with the base station according to the first time synchronization information indicated in the dedicated message, thereby realizing network-side compensation.
  • the UE can synchronize with the base station according to the first time synchronization information and the second time synchronization information (synchronize twice), or the UE can synchronize with the base station according to the first time synchronization information and the second time synchronization information. Synchronize (synchronize once), so I won’t go into details here.
  • description is made by assuming that the UE synchronizes with the base station according to the first time synchronization information and the second time synchronization information, respectively.
  • the UE When the UE performs time synchronization with the base station according to the first time synchronization information, it can be based on whether the first time synchronization information includes compensation for propagation delay, that is, whether the first time synchronization information is time synchronization information that compensates for the propagation delay , To determine the specific compensation method, such as determining whether it is network compensation or terminal compensation.
  • the first time synchronization information is time synchronization information that compensates for the propagation delay, it is network compensation, and the UE can synchronize with the base station according to the first time synchronization information; if the first time synchronization information is uncompensated for the propagation delay
  • the time synchronization information can be terminal compensation, and the UE can synchronize with the base station according to the third time synchronization information such as the target propagation delay compensation value, that is, the terminal can compensate for the propagation delay of the first time synchronization information received by itself, And then synchronize with the base station.
  • the first time synchronization information is time synchronization information that compensates for the propagation delay, for example, the UE can determine it in the following manner.
  • the UE can indicate that the first time synchronization information is time synchronization information that compensates for the propagation delay.
  • a time synchronization information is compensated for propagation delay.
  • the UE can synchronize with the base station according to the first time synchronization information.
  • the dedicated message may also carry a first indicator, and the UE may determine that the first time synchronization information is time synchronization information that compensates for the propagation delay when the first indicator is detected. Furthermore, the UE can synchronize with the base station according to the first time synchronization information.
  • the base station can only send the time synchronization information compensated for the propagation delay to the UE through a dedicated message such as dedicated RRC, so that for each UE, the network can compensate for different propagation delay compensation values to improve the base station
  • the accuracy of the time synchronization information sent to the UE improves the reliability of time synchronization between the UE and the base station, avoids the problem of inaccurate time synchronization information and unreliable synchronization that cannot meet service transmission requirements, and helps improve data transmission. reliability.
  • it avoids the problem that the UE receives the time synchronization information of the dedicated message and the broadcast message at the same time, but the UE behavior is uncertain when the two information are different.
  • FIG. 8 is an interactive schematic diagram of another time synchronization method provided by an embodiment of the present application.
  • the network device can realize the time synchronization between the terminal and the network device by sending a dedicated message carrying the first time synchronization information to the terminal.
  • the first time synchronization information does not include the time that compensates for the propagation delay.
  • Synchronization information that is, the first time synchronization information is time synchronization information with uncompensated propagation delay, and the compensation situation indicated by the first time synchronization information is uncompensated propagation delay, and propagation delay compensation can be realized by the terminal.
  • the method may include:
  • the base station sends a broadcast message to the UE, where the broadcast message includes second time synchronization information, and the second time synchronization information is synchronization information without compensation for propagation delay.
  • the base station may indicate time synchronization information, that is, the second time synchronization information, through a broadcast message, and the second time synchronization information does not include compensation for propagation delay.
  • the UE performs time synchronization with the base station according to the second time synchronization information.
  • the UE After receiving the broadcast message, the UE can complete time synchronization with the base station according to the second time synchronization information notified in the broadcast message, such as adjusting the UE's local clock to be the same as the base station clock.
  • the base station determines to perform propagation delay compensation.
  • the base station sends a dedicated message to the UE, where the dedicated message includes first time synchronization information, and the first time synchronization information is time synchronization information without compensation for propagation delay.
  • the base station can only use a dedicated message such as dedicated RRC to notify the first time synchronization information to indicate propagation delay compensation.
  • the special message is used to indicate propagation delay compensation.
  • the dedicated message can be sent to the corresponding UE.
  • the UE After the UE performs propagation delay compensation, it performs time synchronization with the base station.
  • a UE that receives a dedicated message including the first time synchronization information can perform time synchronization with the base station according to the first time synchronization information indicated in the dedicated message.
  • the UE When the UE performs time synchronization with the base station according to the first time synchronization information, it can be based on whether the first time synchronization information includes compensation for propagation delay, that is, whether the first time synchronization information is time synchronization information that compensates for the propagation delay , To determine the specific compensation method, such as determining whether it is network compensation or terminal compensation.
  • the first time synchronization information is time synchronization information that compensates for the propagation delay, it is network compensation, and the UE can synchronize with the base station according to the first time synchronization information; if the first time synchronization information is uncompensated for the propagation delay
  • the time synchronization information can be terminal compensation, and the UE can synchronize with the base station according to the third time synchronization information such as the target propagation delay compensation value, that is, the terminal can compensate for the propagation delay of the first time synchronization information received by itself, And then synchronize with the base station.
  • the first time synchronization information is time synchronization information that has not compensated for the propagation delay.
  • the UE can determine it in the following manner.
  • the UE may indicate that the first time synchronization information is time synchronization information that has not compensated for the propagation delay, and the UE may consider that the network has not synchronized the first time synchronization information. Information is compensated for the propagation delay.
  • the dedicated message may also carry a second indicator to indicate that no compensation is made; or when the dedicated message does not carry an indicator, to indicate that no compensation is made.
  • the UE After the UE determines that the first time synchronization information is the time synchronization information that has not compensated for the propagation delay, if the UE has the propagation delay compensation capability, it can also perform propagation delay compensation, such as obtaining a target propagation delay compensation value for the first Compensate for one time synchronization information, and then synchronize with the base station based on the compensated first time synchronization information; or, the UE may perform propagation delay compensation for the second time synchronization information according to the target propagation delay compensation value and then synchronize with the base station; Or, the synchronization can be performed with the base station according to the first synchronization information and the target propagation delay compensation value respectively.
  • propagation delay compensation such as obtaining a target propagation delay compensation value for the first Compensate for one time synchronization information, and then synchronize with the base station based on the compensated first time synchronization information; or, the UE may perform propagation delay compensation for the second time synchronization information according to the target propag
  • the UE determines that the network side has not compensated for propagation delay, for example, the UE has not received a dedicated message including the first time synchronization information, or has not received the first time synchronization information within a certain period of time. If the dedicated message is not received within a certain period of time after receiving the broadcast message (such as the first time, the first time can be preset or notified by the network side), the UE can broadcast the message by itself Delay compensation, such as compensation according to the target propagation delay compensation value and synchronization with the base station, or the UE can directly synchronize according to the second time synchronization information, regardless of whether propagation delay compensation is not considered.
  • Delay compensation such as compensation according to the target propagation delay compensation value and synchronization with the base station, or the UE can directly synchronize according to the second time synchronization information, regardless of whether propagation delay compensation is not considered.
  • the UE determines the target propagation delay compensation value that is, before the UE determines to perform the propagation delay compensation, it can also be based on whether the parameter value corresponding to the UE meets the corresponding condition, and when it is met (such as with the base station) If the distance is greater than the distance threshold, etc.), it is determined that it is necessary to compensate for the propagation delay of the first time synchronization information received by itself.
  • the base station can only send the time synchronization information without compensation for propagation delay to the UE through a dedicated message such as dedicated RRC, so that the UE can perform propagation delay compensation according to the instructions of the dedicated message, so that it can be compensated based on the UE side.
  • a dedicated message such as dedicated RRC
  • the UE can perform propagation delay compensation according to the instructions of the dedicated message, so that it can be compensated based on the UE side.
  • FIG. 9 is an interactive schematic diagram of yet another time synchronization method provided by an embodiment of the present application.
  • the network device can realize the time synchronization between the terminal and the network device by sending a broadcast message carrying the second time synchronization information and a dedicated message carrying the first time synchronization information to the terminal.
  • Both the information and the second synchronization information include time synchronization information that compensates for the propagation delay. After the propagation delay compensation is performed on the terminals in the cell through the broadcast message, some terminals may be further compensated through the time synchronization information carried in the dedicated message.
  • the method may include:
  • the base station sends a broadcast message to the UE, where the broadcast message includes second time synchronization information, and the second time synchronization information is synchronization information that compensates for propagation delay.
  • the base station may indicate time synchronization information, that is, the second time synchronization information, through a broadcast message, and the second time synchronization information includes compensation for propagation delay.
  • the base station can detect whether to perform propagation delay compensation, or determine whether there is a UE that needs to perform propagation delay compensation in the cell. Furthermore, when it is determined to perform propagation delay compensation, the base station may use broadcast notification to compensate for the propagation delay time synchronization information, that is, the second time synchronization information, which is broadcast by the base station to UEs in the cell.
  • the base station can detect UEs whose distance from the base station is greater than the distance threshold, or UEs whose RSRP with the base station is less than the power threshold, or UEs whose path loss with the base station is greater than the path loss threshold, or,
  • the propagation delay compensation is determined, which is similar to the manner of determining the propagation delay compensation when sending a dedicated message. For details, please refer to the relevant description of the foregoing embodiment, which will not be repeated here.
  • the base station may determine the second time synchronization information according to a preset propagation delay compensation value, for example, based on the original time synchronization information through the propagation delay compensation value to obtain the second time synchronization information.
  • the time synchronization information may directly carry the propagation delay compensation value in the broadcast message; or, the base station may determine the propagation delay compensation value according to the parameter value and then determine the second time synchronization information according to the propagation delay compensation value.
  • the method of determining the propagation delay compensation value and determining the second time synchronization information according to the propagation delay compensation value, and the propagation delay compensation value corresponding to the above-mentioned determined first time synchronization information is determined according to the propagation delay compensation value
  • the manner of the first time synchronization information is similar and will not be repeated here; alternatively, the base station may determine the propagation delay compensation value according to the average value of the parameter values corresponding to each UE, etc., which is not limited in this application.
  • the UE performs time synchronization with the base station according to the second time synchronization information.
  • the UE After receiving the broadcast message, the UE can complete time synchronization with the base station according to the second time synchronization information notified in the broadcast message, such as adjusting the UE's local clock to be the same as the base station clock.
  • the base station determines to perform propagation delay compensation.
  • the base station sends a dedicated message to the UE, where the dedicated message includes first time synchronization information, and the first time synchronization information is time synchronization information that compensates for propagation delay.
  • the UE performs time synchronization with the base station according to the first time synchronization information.
  • the base station can only use a dedicated message such as dedicated RRC to notify the UE of the compensated time synchronization information, namely The time synchronization information that compensates for the propagation delay, that is, the first time synchronization information.
  • a dedicated message such as dedicated RRC to notify the UE of the compensated time synchronization information
  • the network can first notify the same time synchronization information through broadcast, and then use dedicated messages such as dedicated RRC to notify the remaining UEs of the synchronization time information. Can reduce dedicated RRC signaling overhead.
  • the first time synchronization information may include a time offset value from the time indicated by the second time synchronization information, and then the UE may be based on the time indicated by the second time synchronization information and the time offset value
  • the network can first use broadcast notification to compensate for the time synchronization information such as common value of the propagation delay, and then use dedicated RRC to notify the time synchronization information such as offset that compensates for the propagation delay, so as to reduce only the complete synchronization clock notification in the dedicated RRC message. Signaling overhead required for information.
  • steps 903 to 905 may not be performed, and the compensation can be achieved only through a broadcast message.
  • the UE can also determine whether to further compensate after receiving the broadcast message . For example, the UE can start a timer when receiving a broadcast message. If a dedicated message is received within the timer duration, the UE can consider the network to compensate. If the dedicated message is not received within the timer duration, the UE can compensate by itself ( The compensation method can refer to the relevant description in the foregoing embodiment, which will not be repeated here), or no compensation. That is to say, when the UE receives a dedicated message within a certain time range after receiving the broadcast message, it can synchronize according to the dedicated message. If the dedicated message is not received within the certain time range, the UE can compensate or not compensate by itself. Synchronize.
  • the UE’s behavior is clarified by which message the UE uses to determine the time synchronization information.
  • the broadcast message carries the time synchronization information that compensates for the propagation delay for synchronization, which helps to reduce the sending frequency and signaling overhead of the dedicated message containing the time synchronization information, because some UEs compensate for the propagation delay time through the broadcast message After the synchronization information is synchronized, no further compensation may be required, so there is no need to send a dedicated message.
  • the network device can implement time synchronization between the terminal and the network device by sending a broadcast message carrying the second time synchronization information and a dedicated message carrying the first time synchronization information to the terminal.
  • the second synchronization information includes time synchronization information that compensates for the propagation delay
  • the first time synchronization information is time synchronization information that has not compensated for the propagation delay, and can be further compensated by the terminal, so that it can realize the broadcast message to the cell in the cell.
  • the terminal After the terminal performs propagation delay compensation, it can also instruct some terminals to perform further compensation through a dedicated message.
  • the method may include:
  • a base station sends a broadcast message to a UE, where the broadcast message includes second time synchronization information, and the second time synchronization information is synchronization information that compensates for propagation delay.
  • the UE performs time synchronization with the base station according to the second time synchronization information.
  • steps 1001-1002 For the description of steps 1001-1002, reference may be made to the related descriptions of steps 901-902 in the embodiment shown in FIG. 9, which will not be repeated here.
  • the base station determines to perform propagation delay compensation.
  • the base station sends a dedicated message to the UE, where the dedicated message includes first time synchronization information, and the first time synchronization information is time synchronization information without compensation for propagation delay.
  • the UE After the UE performs propagation delay compensation, it performs time synchronization with the base station.
  • steps 1003-1005 For the description of steps 1003-1005, reference may be made to the related descriptions of steps 803-805 in the embodiment shown in FIG. 8, which will not be repeated here.
  • the UE when time synchronization information notified by different types of messages (dedicated messages such as dedicated RRC and broadcast messages) is received, the UE’s behavior is clarified by which message the UE uses to determine the time synchronization information.
  • the broadcast message carries the time synchronization information that compensates for the propagation delay for synchronization, which helps to reduce the sending frequency and signaling overhead of the dedicated message containing the time synchronization information, and can instruct the UE to compensate for the propagation delay through the dedicated message. The signaling overhead can be further reduced.
  • the terminal 1100 may include a processor 1110, a memory 1120, a communication interface 1130, and one or more programs 1121, where the one or more programs 1121 are stored in the memory 1120, and Is configured to be executed by the processor 1110, and the program includes instructions for executing the following steps:
  • the dedicated message including the first time synchronization information, and the first time synchronization information is used to indicate the compensation for the propagation delay;
  • the compensation situation is that the propagation delay is not compensated, and the terminal is a terminal with propagation delay compensation capability; the instructions in the program are also used to perform the following operations:
  • the instructions in the program are specifically used to perform the following operations:
  • the parameter value includes any one or more of the following:
  • the instructions in the program are also used to perform the following operations:
  • the instructions in the program are also used to perform the following operations: perform time synchronization with the network device according to the second time synchronization information, and/or, perform synchronization with the network device according to the first time synchronization information
  • the instructions in the program are specifically used to perform the following operations:
  • the instructions in the program are specifically used to perform the following operations:
  • the target time synchronization information includes the first time synchronization information and the second time synchronization information
  • the instructions in the program are specifically used to perform the following operations:
  • the instructions in the program are specifically used to perform the following operations:
  • the target time synchronization information includes the first time synchronization information
  • the dedicated message is a dedicated radio resource control RRC message or a dedicated media access control MAC message or a dedicated downlink control information DCI.
  • the network device 1200 may include: a processor 1210, a memory 1220, a communication interface 1230, and one or more programs 1221, where the one or more programs 1221 are stored in the memory 1220, And is configured to be executed by the processor 1210, and the program includes instructions for executing the following steps;
  • a dedicated message is sent to the terminal through the communication interface 1230, the dedicated message includes the first time synchronization information, and the first time synchronization information is used to indicate the compensation of the propagation delay.
  • the terminal is a terminal whose parameter value meets corresponding conditions, and/or, the terminal is a terminal that does not have propagation delay compensation capabilities, and/or, the terminal is in the network The terminal of the device corresponding to the cell;
  • the parameter value includes any one or more of the following:
  • the distance between the terminal and the network device, the reference signal received power between the terminal and the network device, the path loss value between the terminal and the network device, and the cell coverage parameter corresponding to the network device is the distance between the terminal and the network device, the reference signal received power between the terminal and the network device, the path loss value between the terminal and the network device, and the cell coverage parameter corresponding to the network device.
  • the cell coverage parameter corresponding to the network device is greater than the coverage threshold, and/or the network device has a propagation delay compensation capability.
  • the compensation situation is that the propagation delay has been compensated, and before the network device sends a dedicated message to the terminal, the instructions in the program are also used to perform the following operations:
  • the parameter value includes any one or more of the following:
  • the distance between the terminal and the network device, the reference signal received power between the terminal and the network device, the path loss value between the terminal and the network device, and the cell coverage parameter corresponding to the network device is the distance between the terminal and the network device, the reference signal received power between the terminal and the network device, the path loss value between the terminal and the network device, and the cell coverage parameter corresponding to the network device.
  • the compensation situation is that the propagation delay is not compensated, the first time synchronization information is time synchronization information without propagation delay compensation, and the terminal has the propagation delay compensation capability Terminal.
  • the instructions in the program are also used to perform the following operations:
  • a broadcast message is sent to the terminal through the communication interface 1230, where the broadcast message includes the second time synchronization information.
  • the compensation condition is that the propagation delay has been compensated, and the first time synchronization information includes a time offset value between the time indicated by the second time synchronization information.
  • the dedicated message is a dedicated radio resource control RRC message or a dedicated media access control MAC message or a dedicated downlink control information DCI.
  • the terminal and the network device include hardware structures and/or software modules corresponding to the respective functions.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software.
  • the embodiment of the present application may divide the terminal and the network device into functional units according to the foregoing method examples.
  • each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit.
  • the above-mentioned integrated unit can be realized in the form of hardware or software program module. It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.
  • the terminal 1300 may include: a communication unit 1301 and a processing unit 1302. Among them, these units can perform the corresponding functions of the terminal in the foregoing method example.
  • the processing unit 1302 is used to control and manage the actions of the terminal. For example, the processing unit 1302 is used to support the terminal to execute steps 301 to 302 in FIG. 3, 502 and 505 in FIG. 5, 604 in FIG. 6, and steps in FIG. 702, 705, 802, 805 in Fig. 8, 902, 905 in Fig. 9, 1002, 1005 in Fig. 10, and/or other processes used in the techniques described herein.
  • the communication unit 1301 may be used to support communication between the terminal and other devices, for example, communication with a network device.
  • the terminal may further include a storage unit 1303 for storing program codes and data of the network device.
  • the processing unit 1302 may be a processor or a controller, such as a central processing unit (CPU), a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), and an application-specific integrated circuit (Application-Specific Integrated Circuit). Integrated Circuit, ASIC), Field Programmable Gate Array (FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logical blocks, modules, and circuits described in conjunction with the disclosure of this application.
  • the processor may also be a combination for realizing computing functions, for example, including a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.
  • the communication unit 1301 may be a transceiver, a transceiver circuit, a radio frequency chip, etc.
  • the storage unit 1303 may be a memory.
  • the communication unit 1301 is configured to receive a dedicated message from a network device, the dedicated message includes first time synchronization information, and the first time synchronization information is used to indicate the compensation for propagation delay;
  • the processing unit 1302 is configured to perform time synchronization with the network device according to the first time synchronization information.
  • the compensation situation is that the propagation delay is not compensated, and the terminal is a terminal with propagation delay compensation capability;
  • the processing unit 1302 is specifically configured to perform propagation delay compensation for the first time synchronization information; and perform time synchronization with the network device according to the compensated first time synchronization information.
  • the processing unit 1302 is specifically configured to determine a target propagation delay compensation value from a plurality of propagation delay compensation values according to the parameter value; according to the target propagation delay compensation to synchronize the first time Information propagation delay compensation; wherein, the parameter value includes any one or more of the following:
  • the communication unit 1301 may also be used to receive a broadcast message from the network device, where the broadcast message includes second time synchronization information;
  • the processing unit 1302 may be specifically configured to determine target time synchronization information for time synchronization with the network device according to the first time synchronization information and the second time synchronization information; according to the target time
  • the synchronization information is synchronized with the time of the network device.
  • the processing unit 1302 may be specifically configured to determine that the target time synchronization information includes the first time synchronization information and the second time synchronization information; according to the first time synchronization information and the second time synchronization information; The second time synchronization information performs time synchronization with the network device.
  • the first time synchronization information includes a time offset value between the time indicated by the second time synchronization information and the time Situation
  • the processing unit 1302 may be specifically configured to perform time synchronization with the network device according to the time indicated by the second time synchronization information and the time offset value.
  • the processing unit 1302 may be specifically configured to determine that the target time synchronization information includes the first time synchronization information when the first time synchronization information is different from the second time synchronization information. Synchronization information; perform time synchronization with the network device according to the first time synchronization information.
  • the dedicated message is a dedicated radio resource control RRC message or a dedicated media access control MAC message or a dedicated downlink control information DCI.
  • the terminal involved in the embodiment of the present application may be the terminal shown in FIG. 11.
  • the terminal may implement part or all of the steps performed by the terminal in the method in the embodiments shown in FIG. 3 to FIG. 10 through the foregoing unit.
  • the embodiment of the present application is a device embodiment corresponding to the method embodiment, and the description of the method embodiment is also applicable to the embodiment of the present application, and will not be repeated here.
  • the network device 1400 may include: a processing unit 1401 and a communication unit 1402. Among them, these units can perform the corresponding functions of the network device in the foregoing method example.
  • the processing unit 1401 is used to control and manage the actions of the network device.
  • the processing unit 1401 is used to support the network device to perform steps 401 to 402 in FIG. 4, 503 in FIG. 5, 602 in FIG. 6, and steps in FIG. 703, 803 in FIG. 8, 903 in FIG. 9, 1003 in FIG. 10, and/or other processes used in the techniques described herein.
  • the communication unit 1402 may be used to support communication between the network device and other devices, such as communication with a terminal.
  • the network device may also include a storage unit 1403 for storing program codes and data of the network device.
  • the processing unit 1401 may be a processor or a controller
  • the communication unit 1402 may be a transceiver, a transceiver circuit, a radio frequency chip, etc.
  • the storage unit 1403 may be a memory.
  • the processing unit 1401 is configured to determine propagation delay compensation
  • the communication unit is configured to send a dedicated message to the terminal, where the dedicated message includes first time synchronization information, and the first time synchronization information is used to indicate a propagation delay compensation situation.
  • the terminal is a terminal whose parameter value meets corresponding conditions, and/or, the terminal is a terminal that does not have propagation delay compensation capabilities, and/or, the terminal is in the network The terminal of the device corresponding to the cell;
  • the parameter value includes any one or more of the following:
  • the distance between the terminal and the network device, the reference signal received power between the terminal and the network device, the path loss value between the terminal and the network device, and the cell coverage parameter corresponding to the network device is the distance between the terminal and the network device, the reference signal received power between the terminal and the network device, the path loss value between the terminal and the network device, and the cell coverage parameter corresponding to the network device.
  • the cell coverage parameter corresponding to the network device is greater than the coverage threshold, and/or the network device has a propagation delay compensation capability.
  • the compensation situation is that the propagation delay has been compensated
  • the processing unit 1401 may be further configured to determine a propagation delay compensation value according to the parameter value; determine the first time synchronization information according to the propagation delay compensation value;
  • the parameter value includes any one or more of the following:
  • the distance between the terminal and the network device, the reference signal received power between the terminal and the network device, the path loss value between the terminal and the network device, and the cell coverage parameter corresponding to the network device is the distance between the terminal and the network device, the reference signal received power between the terminal and the network device, the path loss value between the terminal and the network device, and the cell coverage parameter corresponding to the network device.
  • the compensation situation is that the propagation delay is not compensated, and the terminal is a terminal with propagation delay compensation capability.
  • the communication unit 1402 may also be used to send a broadcast message to the terminal, where the broadcast message includes the second time synchronization information.
  • the compensation condition is that the propagation delay has been compensated, and the first time synchronization information includes a time offset value between the time indicated by the second time synchronization information.
  • the dedicated message is a dedicated radio resource control RRC message or a dedicated media access control MAC message or a dedicated downlink control information DCI.
  • the terminal involved in the embodiment of the present application may be the network device shown in FIG. 12.
  • the network device may implement part or all of the steps performed by the network device in the method in the embodiments shown in FIG. 3 to FIG. 10 through the foregoing unit.
  • the embodiment of the present application is a device embodiment corresponding to the method embodiment, and the description of the method embodiment is also applicable to the embodiment of the present application, and will not be repeated here.
  • the division of units in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.
  • the functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
  • This application also provides a communication system, which includes the aforementioned terminal and/or network device.
  • the system may also include other devices that interact with the foregoing network elements in the solution provided in the embodiment of the present application.
  • the network device and/or the terminal can execute part or all of the steps in the method in the embodiment shown in FIG. 3 to FIG. 10. For details, reference may be made to the relevant description of the above embodiment, which will not be repeated here.
  • the embodiment of the present application also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program causes the computer to execute the terminal in the above method embodiment Or part or all of the steps described by the network device.
  • the embodiments of the present application also provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute the method embodiments described above. Part or all of the steps described in the terminal or network device.
  • the computer program product may be a software installation package.
  • the steps of the method or algorithm described in combination with the disclosure of this application can be implemented in a hardware manner, or can be implemented in a manner in which a processor executes software instructions.
  • Software instructions can be composed of corresponding software modules, which can be stored in random access memory (Random Access Memory, RAM), flash memory, read-only memory (Read Only Memory, ROM), and erasable programmable read-only memory ( Erasable Programmable ROM (EPROM), Electrically Erasable Programmable Read-Only Memory (Electrically EPROM, EEPROM), registers, hard disk, mobile hard disk, CD-ROM, or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium.
  • the storage medium may also be an integral part of the processor.
  • the processor and the storage medium may be located in the ASIC.
  • the ASIC can be located in a communication device such as a terminal or a network device.
  • the processor and the storage medium may also exist as discrete components in the communication device.
  • the functions described in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a Digital Video Disc (DVD)), or a semiconductor medium (for example, a Solid State Disk (SSD)) )Wait.

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Abstract

本申请实施例公开了一种时间同步方法及相关设备，包括：终端接收来自网络设备的专用消息，所述专用消息包括第一时间同步信息，所述第一时间同步信息用于指示传播时延的补偿情况；所述终端根据所述第一时间同步信息，进行与所述网络设备之间的时间同步。采用本申请实施例，能够基于传播时延补偿实现时间同步，有助于提升时间同步精度，进而提升了数据传输的可靠性。

Description

时间同步方法及相关设备 技术领域
本申请涉及通信技术领域，尤其涉及一种时间同步方法及相关设备。
背景技术
在通信系统中，终端与网络侧如基站之间需要时间同步，以实现数据的可靠传输。在进行同步时，终端是通过获取时间提前量(Timing Advance，TA)来进行同步校准的。随着数据传输要求的不断提高，目前的时间同步方式可能已无法满足同步精度需求。由此，如何实现终端与基站间的时间同步以确保同步精度成为关键。
发明内容
本申请的实施例提供一种时间同步方法及相关设备，能够基于传播时延补偿实现时间同步，有助于提升时间同步精度，进而提升了数据传输的可靠性。
第一方面，本申请实施例提供一种时间同步方法，包括：
终端接收来自网络设备的专用消息，所述专用消息包括第一时间同步信息，所述第一时间同步信息用于指示传播时延的补偿情况；
所述终端根据所述第一时间同步信息，进行与所述网络设备之间的时间同步。
第二方面，本申请实施例提供一种时间同步方法，包括：
网络设备确定进行传播时延补偿；
所述网络设备向终端发送专用消息，所述专用消息包括第一时间同步信息，所述第一时间同步信息用于指示传播时延的补偿情况。
第三方面，本申请实施例提供一种终端，该终端具有实现上述方法中终端的行为的部分或全部功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的单元或模块。在可能的设计中，终端可包括处理单元和通信单元，所述处理单元被配置为支持终端执行上述方法中相应的功能。所述通信单元用于支持终端与其他设备之间的通信。所述终端还可以包括存储单元，所述存储单元用于与处理单元耦合，其保存终端必要的程序(指令)和数据等。可选的，处理单元可以为处理器，通信单元可以为收发器，存储单元可以为存储器。
第四方面，本申请实施例提供一种网络设备，该网络设备具有实现上述方法中网络设备的行为的部分或全部功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的单元或模块。在可能的设计中，网络设备可包括处理单元和通信单元，所述处理单元被配置为支持网络设备执行上述方法中相应的功能。所述通信单元用于支持网络设备与其他设备之间的通信。所述网络设备还可以包括存储单元，所述存储单元用于与处理单元耦合，其保存网络设备必要的程序(指令)和数据等。可选的，处理单元可以为处理器，通信单元可以为收发器，存储单元可以为 存储器。
第五方面，本申请实施例提供一种终端，包括处理器、存储器、收发器以及一个或多个程序，其中，所述一个或多个程序被存储在所述存储器中，并且被配置由所述处理器执行，所述程序包括用于执行本申请实施例第一方面任一方法中的步骤的指令。
第六方面，本申请实施例提供一种网络设备，包括处理器、存储器、通信接口以及一个或多个程序，其中，所述一个或多个程序被存储在所述存储器中，并且被配置由所述处理器执行，所述程序包括用于执行本申请实施例第二方面任一方法中的步骤的指令。
第七方面，本申请实施例提供了一种通信系统，该系统包括上述方面的终端和/或网络设备。在另一种可能的设计中，该系统还可以包括本申请实施例提供的方案中与该终端或网络设备进行交互的其他设备。
第八方面，本申请实施例提供了一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序，所述计算机程序使得计算机执行如本申请实施例第一方面的方法中所描述的部分或全部步骤。
第九方面，本申请实施例提供了一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序，所述计算机程序使得计算机执行如本申请实施例第二方面的方法中所描述的部分或全部步骤。
第十方面，本申请实施例提供了一种计算机程序产品，其中，所述计算机程序产品包括存储了计算机程序的非瞬时性计算机可读存储介质，所述计算机程序可操作来使计算机执行如本申请实施例第一方面的方法中所描述的部分或全部步骤。该计算机程序产品可以为一个软件安装包。
第十一方面，本申请实施例提供了一种计算机程序产品，其中，所述计算机程序产品包括存储了计算机程序的非瞬时性计算机可读存储介质，所述计算机程序可操作来使计算机执行如本申请实施例第二方面的方法中所描述的部分或全部步骤。该计算机程序产品可以为一个软件安装包。
在本申请实施例提供的方案中，终端能够通过接收网络设备发送的携带时间同步信息的专用消息，基于该时间同步信息指示的传播时延补偿来实现终端和网络设备之间的时间同步，使得能够满足低时延要求，达到较高的时间同步精度，进而有助于提升数据传输的可靠性。
附图说明
下面将对实施例或现有技术描述中所需要使用的附图进行地介绍。
图1a是本申请实施例提供的一种通信系统的架构图；
图1b是本申请实施例提供的一种TSN系统架构图；
图2是本申请实施例提供的一种时间同步精度误差示意图；
图3是本申请实施例提供的一种时间同步方法的流程示意图；
图4是本申请实施例提供的另一种时间同步方法的流程示意图；
图5是本申请实施例提供的一种时间同步方法的交互示意图；
图6是本申请实施例提供的另一种时间同步方法的交互示意图；
图7是本申请实施例提供的又一种时间同步方法的交互示意图；
图8是本申请实施例提供的又一种时间同步方法的交互示意图；
图9是本申请实施例提供的又一种时间同步方法的交互示意图；
图10是本申请实施例提供的又一种时间同步方法的交互示意图；
图11是本申请实施例提供的一种终端的结构示意图；
图12是本申请实施例提供的一种网络设备的结构示意图；
图13是本申请实施例提供的另一种终端的结构示意图；
图14是本申请实施例提供的另一种网络设备的结构示意图。
具体实施方式
下面将结合附图对本申请实施例中的技术方案进行描述。
可以理解，本申请的技术方案可具体应用于时间敏感性网络(Time Sensitive Network，TSN)系统、时间敏感性通信(Time Sensitive Communication，TSC)系统、第五代移动通信(the 5th Generation，5G)系统或者称为新无线(New Radio，NR)系统、长期演进(Long Term Evolution，缩写：LTE)系统等。
请参见图1a，是本申请提供的一种通信系统的架构图。如图1a所示，该通信系统可以包括：一个或多个网络设备101，以及，一个或多个终端102，图1a中仅示出一个网络设备101和一个终端102作为示例。该网络设备101和终端102之间可以进行数据传输。为了提升数据传输的可靠性，需要进行终端102和网络设备101之间的时间同步。
在本申请中，网络设备101可通过向终端102发送广播消息和/或专用消息来指示传播时延的补偿情况，从而终端102可根据该广播消息和/或专用消息指示的传播时延补偿情况，来进行与网络设备之间的时间同步。这就能够基于传播时延补偿实现时间同步，有助于提升时间同步精度，且能够提供更低的时延保证，满足了低时延要求，进而可进一步提升数据传输的可靠性。
例如，在某些场景下，如对于TSN或TSC系统，又如对于某些高同步精度要求的业务，又如对于某些低时延要求的业务等等，系统需要确保更高的时间同步精度，以满足数据传输需求。以TSN系统为例，请参见图1b，为本申请实施例提供的一种TSN系统架构图。如图1b所示，该TSN系统可包括TSN bridge(TSN桥或TSN网桥)、设备侧(Device)TSN转换设备(TSN Translator)、5G系统(5GS)、网络侧桥(Network side of Bridge)和TSN系统(TSN System)。其中，该TSN bridge可以为End Station(终端站、终点站、端站点等等)；该5GS可包括终端如用户设备(User Equipment，UE)、(R)AN(即接入网AN，Access Network；或无线接入网RAN，Radio Access Network)、接入和移动性管理(Access and Mobility Management Function，AMF)实体、会话管理功能(Session Management Function，SMF)实体、统一数据管理(Unified Data Management，UDM)实体、用户面功能(User Plane Function，UPF)实体、策略与计费功能(Policy and Charging Function，PCF)实体、网络开放功能(Network Exposure Function，NEF)实体等网元；该Network side of Bridge可包括控制面(CP)TSN转换设备如应用功能(Network Exposure Function，AF)，以及用户面(UP)TSN转换设备；该TSN System可包括TSN集中用户配置(Centralized User Configuration，GUC)、TSN集中网络配置(Centralized NetworkConfiguration，CNC)、TSN桥等网元。其中，(R)AN可包括网络设备如基站，该设备侧TSN Translator和该UE为设备侧桥(Device side of Bridge)中的网元。5G工业互联网(Industrial internet of Things，IIoT)中需支持工业自动化(Factory automation)、传输自动化(Transport Industry)、智能电力(Electrical Power Distribution)等业务在5G系统的传输。基 于其时延和可靠性的传输需求，IIoT引入了时间敏感性网络TSN网络或TSC的概念。在TSN网络中，可将5G网络作为TSN bridge，通过5G网络为TSN网络和业务提供服务。由此，5G系统需要确保更高的时钟同步精度，比如需要满足1us的时间同步精度需求，以便这些业务在5G网络中传输时，机械操作的每一个点的操作和接续精准。
在进行同步时，一般会存在误差，终端进行时间同步后，最终是否满足同步精度需求与网络侧时间同步精度(accuracy)和终端侧时间同步精度误差(delta，Δ)相关。如图2所示，网络侧时钟(Network clock)和终端侧时钟(UE clock)之间的误差为accuracy+Δ，图2中accuracy记为a。通过本申请的时间同步方式，能够将时间同步精度误差控制在一定范围内，以满足同步精度需求，如确保TSN业务在5G内传输时满足1us的时间同步精度需求。
在一种可能的设计中，在进行本申请的时间同步方式之前，或基于本申请确定出的不需要进行传播时延补偿的终端，终端可通过获取TA来进行同步。终端在空闲态和连接态有不同的获取TA的方式。例如，在终端处于空闲(idle)态或非激活(inactive)态时，可以不维护和网络侧的时间同步，终端可通过随机接入(Random Access，RA)过程，在初始接入过程中，获取TA，比如基于从RAR消息中获取的TAC(TA command，TA命令)来确定TA，以基于TA进行同步。而在终端处于连接(connected)态时，终端可根据网络侧如网络设备发送的TAC来获取TA，比如通过TAC MAC CE来指示TA command，以基于TA进行同步。例如，上行帧传输提前量为(N TA+N TA offset)×T c。其中，N TA与TA command相关。TA command中给出的可以是定时提前量调整的index。对由RAR中携带TA command的场景，N TA＝T A·16·64/2 μ，其中，T A＝TA command，其取值可以为：0,1,2,...,3846。对由专用的TAC MAC CE指示TA command的场景，N TA_new＝N TA_old+(T A-31)·16·64/2 μ，其中，T A＝TA command，其取值为：0,1,2,...,63。，T C为物理层最小时间单位，T c＝1/(Δf max·N f)，Δf max＝480·10 3Hz，N f＝4096。N TA offset的取值可以根据用于上行传输的小区频段来确定，如可以为25600、0、39936、13792个T C。对于不同子载波间隔(Sub Carrier Spacing，SCS)的系统，同步精度要求可以不同，比如对于SCS为15kHz或30kHz的系统，同步精度要求在±256Tc内；对于SCS为60kHz的系统，同步精度要求在±128Tc内；对于SCS为120kHz的系统，同步精度要求在±32Tc内，等等。
在本申请中，网络设备可以为网络侧的一种用来发送或接收信息的实体，比如可以为基站，基站可以用于与一个或多个终端进行通信，也可以用于与一个或多个具有部分终端功能的基站进行通信(比如宏基站与微基站之间的通信，如接入点之间的通信)。基站可以是基站收发台(Base Transceiver Station，BTS)，也可以是长期演进(Long Term Evolution，LTE)系统中的演进型基站(Evolutional Node B，eNB)，还可以是5G系统、NR系统中的基站gNB，等等，此处不一一列举。或者，该网络设备101还可以是传输点(transmission point，TP)、接入点(Access Point，AP)、收发点(transmission and receiver point，TRP)、中继设备、中心单元(Central Unit，CU)，或者具备基站功能的其他网络设备等等，本申请不做限定。
在本申请中，终端是具有通信功能的设备，例如可以是车载设备、可穿戴设备、手持设备(如智能手 机)等。该终端还可以叫做其余名称，比如用户设备(User Equipment，UE)、用户单元、移动台(mobile station)、移动单元(mobile unit)、终端设备等等，本申请不做限定。
在本申请中，时间同步还可称为同步、时钟同步等等，本申请不做限定。时间同步信息可以包括time(时间，如几点几分几秒多少个10纳秒)，参考(reference)系统帧号(System Frame Number，SFN)等。时间同步信息还可包括uncertainty(不确定值)、timeinfotype(时间信息类型，如是否为本地时间)等等。
可以理解，图1a或图1b示出的通信系统只是作为一种示例，并不构成对本申请的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请提供的技术方案对于类似的技术问题，同样适用。
本申请公开了一种时间同步方法及相关设备，终端能够基于传播时延补偿实现时间同步，进而有助于提升数据传输的可靠性。下面结合附图进行详细描述。
请参见图3，图3是本申请实施例提供的一种时间同步方法的流程示意图。本实施例的方法可应用于上述的通信系统中，并可具体应用于发送端如上述的终端中。如图3所示，该方法包括：
301、终端接收来自网络设备的专用消息，该专用消息包括第一时间同步信息，该第一时间同步信息用于指示传播时延的补偿情况。
可选的，该专用(dedicated)消息可以为专用无线资源控制(Radio Resource Control，RRC)消息、专用媒体接入控制(Media Access Control，MAC)消息或专用下行控制信息(Downlink Control Information，DCI)等等。
在本申请中，该补偿情况可以包括已补偿传播时延或未补偿传播时延。也就是说，时间同步信息用于指示传播时延的补偿情况可以是指：该补偿情况为已补偿传播时延，如该时间同步信息中包括补偿了传播时延的同步信息，或者称为，该时间同步信息为补偿了传播时延的时间同步信息；或者，该补偿情况为未补偿传播时延，该时间同步信息(或专用消息)用于指示终端补偿传播时延。
302、终端根据该第一时间同步信息，进行与该网络设备之间的时间同步。
网络设备可通过向终端发送携带第一时间同步信息的专用消息，来向终端指示传播时延补偿情况，进而终端可根据该第一时间同步信息，进行与该网络设备之间的时间同步。
在一种可能的设计中，该补偿情况为已补偿传播时延，如该第一时间同步信息为补偿了传播时延的时间同步信息，即能够实现网络侧补偿。
在一种可能的设计中，该补偿情况为未补偿传播时延，如该第一时间同步信息为未补偿传播时延的时间同步信息，则终端可根据该第一时间同步信息(专用消息)的指示，进行传播时延补偿(propagation delay compensation)，即能够实现终端侧补偿。该终端为具备传播时延补偿能力的终端。即终端对第一时间同步信息进行传播时延补偿，根据补偿后的第一时间同步信息进行与网络设备之间的时间同步。例如，终端在接收到该专用消息之后，可根据目标传播时延补偿值，如根据该目标传播时延补偿值对该第一时间同步信息进行传播时延补偿后，进行与该网络设备之间的时间同步。该目标传播时延补偿值可以预先设置的，或者可以是由网络侧如网络设备通知得到的。
在一种可能的设计中，该预先设置的或网络侧通知的传播时延补偿值可以为多个。如果该传播时延补偿值为多个，终端可以从该多个传播时延补偿值中确定出该目标传播时延补偿值，并根据该目标传播时延 补偿值，进行与该网络设备之间的时间同步。比如终端可以根据参数值从该多个传播时延补偿值中确定出目标传播时延补偿值，进而根据该目标传播时延补偿值对第一时间同步信息进行传播时延补偿后，根据补偿后的第一时间同步信息进行与该网络设备之间的时间同步，以实现通过终端侧进行传播时延补偿。可选的，该参数值可以包括以下任一项或多项：该终端与该网络设备之间的距离、该终端与该网络设备之间的接收功率如参考信号接收功率(Reference Signal Received Power、RSRP)、该终端与该网络设备之间的路径损耗值、该网络设备对应的小区覆盖参数等等。进一步可选的，可以预先设置得到参数值(如上述的距离、接收功率、路径损耗值、小区覆盖参数等)区间和该多个传播时延补偿值的对应关系，以基于该对应关系快速确定出参数值对应的传播时延补偿值作为该目标传播时延补偿值。其中，该小区覆盖参数可以包括小区半径和/或小区覆盖范围和/或第一位置点和第二位置点之间的距离等等，该第一位置点和第二位置点可以预先设置得到，或者可以由网络侧如网络设备通知得到。
在一种可能的设计中，终端还可接收来自该网络设备的广播消息，该广播消息包括第二时间同步信息，进而终端可根据该第二时间同步信息，进行与该网络设备之间的时间同步。可选的，该第二时间同步信息也可用于指示传播时延的补偿情况，比如该补偿情况为已补偿传播时延，该第二时间同步信息为补偿了传播时延的时间同步信息；或者，该补偿情况为未补偿传播时延，该第二时间同步信息为未补偿传播时延的时间同步信息。例如，终端可先接收该广播消息，根据第二时间同步信息进行与网络设备之间的时间同步之后，再根据接收的专用消息，进行与该网络设备之间的时间同步，即根据该第二时间同步信息和第一时间同步信息分别进行同步(两次同步)。可选的，在根据专用消息携带的时间同步信息进行同步时，或者说在根据第一时间同步信息进行同步时，终端可根据该第一时间同步信息和该第二时间同步信息，确定用于进行与网络设备之间的时间同步的目标时间同步信息，进而终端可根据该目标时间同步信息进行与网络设备之间的时间同步。进一步可选的，终端还可在该第一时间同步信息与该第二时间同步信息不同时，再根据该第一时间同步信息进行与该网络设备之间的时间同步。否则，如果该第一时间同步信息与该第二时间同步信息相同，则可视为同步信息未发生改变，不进行同步处理，以节省同步开销。又或者，不论该第一时间同步信息与该第二时间同步信息是否相同，终端在收到第一时间同步信息后，均按照第一时间同步信息进行与该网络设备之间的时间同步。
或者，在一种可能的设计中，终端还可接收来自该网络设备的广播消息，该广播消息包括第二时间同步信息，进而终端可根据该第一时间同步信息和该第二时间同步信息，进行与该网络设备之间的时间同步(一次同步)，比如根据该第一时间同步信息和该第二时间同步信息，确定用于进行与网络设备之间的时间同步的目标时间同步信息，进而终端可根据该目标时间同步信息进行与网络设备之间的时间同步。可选的，该第二时间同步信息也可用于指示传播时延的补偿情况，比如该补偿情况为已补偿传播时延，该第二时间同步信息可以为补偿了传播时延的时间同步信息；或者，该补偿情况为未补偿传播时延，该第二时间同步信息可以为未补偿传播时延的时间同步信息。也就是说，在根据目标时间同步信息进行同步之前，终端先不根据该第二时间同步信息与网络设备进行时间同步，即终端可在获取到该第二时间同步信息和第一时间同步信息之后再一起同步(即只同步一次)，即直接根据该目标时间同步信息进行同步，从而能够通过减少同步次数，节省同步开销。
例如，终端确定该目标时间同步信息包括该第一时间同步信息以及第二时间同步信息，终端可在分别 接收到该广播消息和该专用消息之后，根据该专用消息携带的第一时间同步信息和广播消息携带的第二时间同步信息进行与网络设备之间的时间同步。可选的，在补偿情况为已补偿所述传播时延，且第一时间同步信息包括与第二时间同步信息指示的时间之间的时间偏移值的情况下，终端在根据所述第一时间同步信息和第二时间同步信息进行与网络设备之间的时间同步时，可以根据该第二时间同步信息指示的时间与该时间偏移值，进行与网络设备之间的时间同步。
又如，在第一时间同步信息与第二时间同步信息不同的情况下，终端可确定该目标时间同步信息包括该第一时间同步信息，进而终端可根据该第一时间同步信息进行与网络设备之间的时间同步。
本申请涉及的时间同步信息(如上述的第一时间同步信息、第二时间同步信息等)可以为完整的时间信息，也可以为用于指示该完整的时间信息的指示信息，比如为与前一次时间同步信息(或者为前一次特定类型的消息如广播消息携带的时间同步信息)指示的时间之间的时间偏移值，本申请对时间同步信息所对应的时间信息的指示方式不做限定。例如，在一种可能的设计中，无论是终端分别根据广播消息和专用消息进行同步，还是根据广播消息和专用消息一起同步，该第一时间同步信息和第二时间同步信息可以均为完整的时间信息。又如，在另一种可能的设计中，无论是终端分别根据广播消息和专用消息进行同步，还是根据广播消息和专用消息一起同步，该第一时间同步信息可以不为完整的时间信息，如该第一时间同步信息包括与该第二时间同步信息指示的时间之间的时间偏移值；比如在根据广播消息和专用消息一起同步时，终端可根据该第二时间同步信息指示的时间与该时间偏移值，进行与该网络设备之间的时间同步。其中，该时间偏移值可以为正值、负值或0。
在一种可能的设计中，终端在确定时间同步信息如上述的第一时间同步信息或第二时间同步信息是否补偿了传播时延时，可以通过消息(或时间同步信息)中携带的指示标识来确定是否进行了补偿。比如在时间同步信息为补偿了传播时延的时间同步信息时，可携带第一指示标识，以表明进行了补偿；又如在时间同步信息为未补偿传播时延的时间同步信息，可携带第二指示标识，以表明未进行补偿；又如可通过携带指示标识表明进行了补偿，未携带指示标识时表明未进行补偿，等等，本申请不做限定。
在一种可能的设计中，终端在确定同步信息是否补偿了传播时延时，可以是只要携带了同步信息就表明进行了传播时延补偿，或者只有专用消息携带了时间同步信息表明进行了补偿，为空时可表明未补偿。
在其他可选的实施例中，终端在接收到该广播消息之后，如果在接收到广播消息后的一定时间内(如第一时间内，该第一时间可预先设置得到，或者由网络侧通知得到)接收到携带时间同步信息的专用消息，终端可根据该广播消息携带的时间同步信息和该专用消息携带的时间同步信息进行同步，比如该专用消息携带的时间同步信息为时间偏移值。可选的，如果在该一定时间内未接收到专用消息，或者未接收到包括时间同步信息的专用消息，终端还可自行进行传播时延补偿，比如确定目标传播时延补偿值，根据广播消息携带的时间同步信息和该目标传播时延补偿值进行同步；或者，终端可直接根据该广播消息携带的时间同步信息与网络设备进行同步，而不考虑传播时延补偿与否。其中，该广播消息携带的时间同步信息可以为补偿了传播时延的时间同步信息，也可以为未补偿传播时延的时间同步信息。
在本实施例中，终端能够通过接收网络设备发送的携带时间同步信息的专用消息，基于该时间同步信息指示的传播时延补偿来实现终端和网络设备之间的时间同步，使得能够满足低时延要求，达到较高的时间同步精度，进而有助于提升数据传输的可靠性。
请参见图4，图4是本申请实施例提供的另一种时间同步方法的流程示意图。本实施例的方法可具体应用于上述的网络设备中，如图4所示，该方法包括：
401、网络设备确定进行传播时延补偿。
402、网络设备向终端发送专用消息，该专用消息包括第一时间同步信息，该第一时间同步信息用于指示传播时延的补偿情况。
网络设备可通过检测是否进行传播时延补偿，并在确定进行传播时延补偿时，向终端发送专用消息，通过该专用消息携带的第一时间同步信息指示传播时延补偿情况，以便于终端根据指示传播时延补偿情况的第一时间同步信息，进行与该网络设备之间的时间同步。可选的，该专用消息可以为专用RRC消息、专用MAC消息或专用DCI等等，此处不赘述。
在一种可能的设计中，该终端可以为参数值满足对应条件的终端，和/或，该终端为不具备传播时延补偿能力的终端，和/或，该终端为处于该网络设备对应小区的终端。也就是说，网络设备可通过确定对应的小区内是否存在需要进行传播时延补偿的终端，在确定存在需要进行传播时延补偿的终端时，确定进行传播时延补偿，并可对确定出的终端发送该专用消息。可选的，该参数值可以包括以下任一项或多项：终端与该网络设备之间的距离、终端与该网络设备之间的接收功率如RSRP、终端与该网络设备之间的路径损耗值、该网络设备对应的小区覆盖参数。该参数值满足对应条件可以包括以下任一项或多项：终端与该网络设备之间的距离大于距离阈值、终端与该网络设备之间的接收功率小于功率阈值、终端与该网络设备之间的路径损耗值大于损耗阈值、该网络设备对应的小区覆盖参数大于覆盖阈值等等。
在一种可能的设计中，该网络设备对应的小区覆盖参数大于或等于覆盖阈值，和/或，该网络设备具备传播时延补偿能力。也就是说，网络设备还可通过检测对应的小区覆盖参数是否大于或等于对应的预设阈值，和/或，该网络设备具备传播时延补偿能力，在检测到该小区覆盖参数大于或等于对应的预设阈值，和/或，该网络设备具备传播时延补偿能力时，确定进行传播时延补偿，并可对终端发送该专用消息。其中，小区覆盖参数可以包括小区半径和/或小区覆盖范围和/或小区中第一位置点和第二位置点之间的距离，该第一位置点和第二位置点可以预先设置或者由网络侧通知，例如该第一位置点为终端所在位置点A，第二位置点为小区中心。小区覆盖参数是否大于或等于对应的预设阈值可以是指：小区半径是否大于或等于半径阈值，和/或，小区覆盖范围是否大于或等于覆盖范围阈值，和/或，第一位置点和第二位置点之间的距离如从位置点A到小区中心的距离是否大于或等于对应阈值等等。例如向小区内的所有终端发送该专用消息，又如可向部分终端如按照上述方式确定出的终端发送该专用消息。
在一种可能的设计中，该补偿情况为已补偿传播时延，如该第一时间同步信息为补偿了传播时延的时间同步信息，从而能够实现网络侧补偿。
在一种可能的设计中，网络设备在确定进行传播时延补偿时，还可确定传播时延补偿值，并根据该传播时延补偿值确定该第一时间同步信息。该传播时延补偿值可以是预先设置得到的，或者，可以是根据预设规则确定出的。例如，该网络设备还可根据参数值确定传播时延补偿值，进而根据该传播时延补偿值确定该第一时间同步信息(专用消息)。可选的，该参数值可以包括以下任一项或多项：终端与该网络设备之间的距离、终端与该网络设备之间的接收功率如RSRP、终端与该网络设备之间的路径损耗值、该网络设备对应的小区覆盖参数等等。可选的，可以预先设置得到参数值(如上述的距离、接收功率、路径损耗 值、小区覆盖参数等)区间和该多个传播时延补偿值的对应关系，以基于该对应关系快速确定出参数值对应的传播时延补偿值作为该目标传播时延补偿值。
可以理解，上述终端确定传播时延补偿值所涉及的参数值、确定发送专用消息的终端所涉及的参数值以及网络设备确定传播时延补偿值所涉及的参数值可以相同，也可以存在不同，本申请不做限定。
在一种可能的设计中，该补偿情况为未补偿传播时延，该第一时间同步信息可以为未补偿传播时延的时间同步信息，且该终端为具备传播时延补偿能力的终端。以便于终端根据该第一时间同步信息(专用消息)的指示，进行传播时延补偿，从而能够实现终端侧补偿。
在一种可能的设计中，网络设备还可向终端发送广播消息，该广播消息可包括第二时间同步信息。其中，该第二时间同步信息可以为补偿了传播时延的时间同步信息，或者，该第二时间同步信息可以为未补偿传播时延的时间同步信息(这里，可以要求网络设备仅用专用消息发送补偿了传播时延的时间同步信息，在广播消息中的时间同步信息不包含传播时延补偿)。该广播消息中携带的第二时间同步信息，适用于该网络设备覆盖范围下的所有的终端，即适用于该网络设备对应小区中的所有终端。以便于终端根据该第二时间同步信息，进而与该网络设备之间的时间同步。可选的，网络设备还可通过该第二时间同步信息向终端指示传播时延的补偿情况，与第一时间同步信息类似，此处不赘述。
在一种可能的设计中，该第一时间同步信息可包括与该第二时间同步信息指示的时间之间的时间偏移值。从而终端可根据该时间偏移值来实现与网络设备之间的时间同步，比如可根据该第二时间同步信息指示的时间与该时间偏移值，进行与该网络设备之间的时间同步。
在本实施例中，网络设备可在确定进行传播时延补偿时，向终端发送携带时间同步信息的专用消息，以便于终端基于该时间同步信息指示的传播时延补偿来实现终端和网络设备之间的时间同步，使得能够满足低时延要求，达到较高的时间同步精度，进而有助于提升数据传输的可靠性。
请参见图5，图5是本申请实施例提供的一种时间同步方法的交互示意图。在本实施例中，网络设备可通过向终端发送携带第二时间同步信息的广播消息和携带第一时间同步信息的专用消息，终端可分别根据该第二时间同步信息和第一时间同步信息，实现终端和网络设备之间的时间同步，该第一时间同步信息用于传播时延补偿情况。以终端为UE，网络设备为基站为例，如图5所示，该方法可以包括：
501、基站向UE发送广播消息，该广播消息包括第二时间同步信息。
其中，该第二时间同步信息可以为补偿了传播时延的同步信息，也可以为未补偿传播时延的同步信息。例如，该第二时间同步信息可以为补偿了传播时延的时间同步信息，如果基站确定对UE的时间同步信息进行传播时延补偿，基站可采用广播消息通知UE补偿后的时间同步信息。
可以理解，该广播消息中指示的第二时间同步信息，适用于该基站覆盖范围内的所有的UE。
502、UE根据该第二时间同步信息，进行与该基站之间的时间同步。
UE在接收到该广播消息之后，即可根据广播消息中通知的第二时间同步信息，与基站之间完成时间同步，如调整UE本地时钟与基站时钟相同。比如均为9点10分，误差不超过10us。
503、基站确定进行传播时延补偿。
504、基站向UE发送专用消息，该专用消息包括第一时间同步信息，该第一时间同步信息用于指示传播时延的补偿情况。
如果基站确定对某些UE的时间同步信息，进行进一步的传播时延补偿时，基站可采用专用消息如dedicated RRC指示传播时延补偿情况。
在一种可能的设计中，基站确定进行传播时延补偿，可以是通过确定基站小区内是否存在需要进行传播时延补偿的UE来确定。例如，基站可在检测到与基站之间距离大于距离阈值的UE，和/或，与基站之间的RSRP小于功率阈值的UE，和/或，与基站之间的路损大于路损阈值的UE，和/或，不具备自行执行传播时延补偿的UE等等时，确定进行传播时延补偿。进而基站可仅采用对应消息通知该补偿了传播时延的时间同步信息，比如通过上述的广播消息向小区中的所有UE通知补偿了传播时延的第二时间同步信息，和/或，通过专用消息向这些UE通知补偿了传播时延的第一时间同步信息等等。
在一种可能的设计中，基站确定进行传播时延补偿，可以是通过检测是否需要进行传播时延补偿来确定。例如，基站可通过检测基站小区覆盖参数是否大于或等于对应的覆盖阈值，如小区半径是否大于或等于半径阈值，和/或，小区覆盖范围是否大于或等于覆盖范围阈值，和/或，第一位置点和第二位置点之间的距离是否大于或等于对应阈值等，并在检测到小区覆盖参数大于对应的覆盖阈值时，确定进行传播时延补偿。进而基站可向小区内的所有UE发送广播消息或专用消息通知补偿了传播时延的时间同步信息；或者，基站还可进一步确定发送专用消息的UE，如上述需要进行传播时延补偿的UE，向确定出的UE发送专用消息。
在一种可能的设计中，基站可在具备传播时延补偿能力时，确定进行传播时延补偿。进而基站可向小区内的所有UE发送广播消息或专用消息通知补偿了传播时延的时间同步信息；或者，基站还可进一步确定发送专用消息的UE，向确定出的UE发送专用消息。
在一种可能的设计中，基站还可在与UE传输的业务(数据)的类型为指定类型时，确定进行传播时延补偿，进而可向该指定类型对应的该UE发送专用消息。可选的，该指定类型可以为同步精度要求较高的业务和/或时延要求较高的业务(数据)的类型，比如为TSN/TSC业务(数据)，具体可预先设置得到，本申请不做限定。
在确定出补偿的UE之后，针对不同的UE，基站发送的专用消息携带的第一时间同步信息可以相同也可以不同。比如基站可针对每个UE分别根据对应的参数值确定传播时延补偿值之后，根据确定出的传播时延补偿值确定第一时间同步信息，进而向对应的UE发送包括该第一时间同步信息的专用消息。
505、如果该第一时间同步信息和第二时间同步信息不同，UE根据该第一时间同步信息，进行与该基站之间的时间同步。
UE在根据第一时间同步信息与基站进行时间同步时，可选的，可根据该第一时间同步信息是否包含对传播时延的补偿，即该第一时间同步信息是否为补偿了传播时延的时间同步信息，来确定具体的补偿方式，如确定是否为网络补偿，是否需要终端补偿等等，以进行同步。例如，UE完全根据第一时间同步信息与基站进行时间同步，认为收到专用消息中包含的第一时间同步信息就认为已经完成传播时延补偿。又例如，UE完全根据第一时间同步信息与基站进行时间同步，不考虑传播时延补偿与否的问题。又例如，如果该第一时间同步信息为补偿了传播时延的时间同步信息，即为网络补偿，UE可根据该第一时间同步信息与基站进行同步；如果该第一时间同步信息为未补偿传播时延的时间同步信息，可以为终端补偿，则UE可根据第三时间同步信息如目标传播时延补偿值与基站进行同步，即终端可自行对收到的第一时间同步信息进行传 播时延补偿，进而与基站进行同步。可选的，UE在根据第二时间同步信息与基站进行时间同步时，根据该第二时间同步信息是否包含对传播时延的补偿来进行同步的方式与该第一时间同步信息类似，此处不赘述。
在本实施例中，UE可分别根据第一时间同步信息和第二时间同步信息与基站进行同步(同步两次)。例如，UE可以在确定第一时间同步信息和第二时间同步信息不同(例如，时间同步信息包括的time，和/或，SFN不同)时，再根据该第一时间同步信息，进行与该基站之间的时间同步。如专用消息为dedicated RRC时，UE可根据dedicated RRC(UE follow dedicated RRC)中指示的时间同步信息，调整与基站之间的同步时钟。如果该第一时间同步信息和第二时间同步信息相同，UE可丢弃该第一时间同步信息，不再根据该第一时间同步信息进行同步，以节省同步开销；或者，UE可不进行第一时间同步信息和第二时间同步信息是否相同的检测，只要接收到包括该第一时间同步信息的专用消息，即可根据该第一时间同步信息进行同步，从而降低了检测开销，有助于提升同步可靠性。
可选的，该第一时间同步信息、第二时间同步信息可以为完整的时间信息，也可以为不完整的时间信息如时间偏移值等，此处不赘述。在一种可能的设计中，该第一时间同步信息为与该第二时间同步信息指示的时间之间的时间偏移值，则UE在根据第一时间同步信息与基站同步时，可以根据第二时间同步信息指示的时间与该时间偏移值，确定出最终的时间同步信息即目标时间同步信息后，与基站进行同步。
例如，当UE收到广播消息通知的时间同步信息时，可以基于通知的时间同步信息与基站进行同步；当UE接收到专用消息如dedicated RRC通知的时间同步信息时，UE确定最终的时间同步信息为：广播消息中的时间同步信息对应的同步时钟+dedicated RRC中的时间同步信息对应的同步时钟。假设广播消息对应的时间同步信息为common value，专用消息对应的时间同步信息为offset，则最终的时间同步信息为common value+offset。从而UE在根据第一时间同步信息与基站同步时，可根据该最终的时间同步信息与基站进行同步。从而有助于减少专用消息的信令开销。
在本实施例中，基站可通过向小区中的UE发送广播消息以指示第二时间同步信息，小区中的UE可根据该第二时间同步信息与基站进行同步，基站还可在确定进行传播时延补偿时，向UE发送携带第一时间同步信息的专用消息，以便于UE基于该第一时间同步信息指示的传播时延补偿来实现UE和基站之间的时间同步，通过传播时延补偿，使得能够满足低时延要求，达到较高的时间同步精度，进而有助于提升数据传输的可靠性。
请参见图6，图6是本申请实施例提供的另一种时间同步方法的交互示意图。在本实施例中，网络设备可通过向终端发送携带第二时间同步信息的广播消息和携带第一时间同步信息的专用消息，来实现终端和网络设备之间的时间同步，该第一时间同步信息用于指示传播时延补偿情况。以终端为UE，网络设备为基站为例，如图6所示，该方法可以包括：
601、基站向UE发送广播消息，该广播消息包括第二时间同步信息。
其中，该第二时间同步信息可以为补偿了传播时延的同步信息，也可以为未补偿传播时延的同步信息。
602、基站确定进行传播时延补偿。
603、基站向UE发送专用消息，该专用消息包括第一时间同步信息，该第一时间同步信息用于指示传播时延的补偿情况。
可选的，该步骤601-603可参照上述实施例的相关描述，此处不赘述。
604、UE根据该第一时间同步信息和第二时间同步信息，进行与该基站之间的时间同步。
UE在接收到该广播消息和该专用消息之后，还可根据该第一时间同步信息和第二时间同步信息，进行与基站之间的时间同步。也就是说，UE可在接收到该第二时间同步信息(广播消息)之后，可不进行同步，而在接收到该第一时间同步信息(专用消息)之后，再根据该第一时间同步信息和第二时间同步信息确定最终的时间同步信息即目标时间同步信息后进行同步(同步一次)。
可选的，该第一时间同步信息、第二时间同步信息可以为完整的时间信息，也可以为不完整的时间信息如时间偏移值等，此处不赘述。在一种可能的设计中，该第一时间同步信息可以包括与该第二时间同步信息指示的时间之间的时间偏移值，进而UE在根据第二时间同步信息和第一时间同步信息与基站同步(一次同步)时，可根据第二时间同步信息指示的时间与该时间偏移值，与基站进行同步。
例如，当UE收到广播消息和专用消息如dedicated RRC通知的时间同步信息时，UE确定最终的时间同步信息为：广播消息中的时间同步信息对应的同步时钟+dedicated RRC中的时间同步信息对应的同步时钟。对于一个UE，假设广播消息对应的时间同步信息为common value，专用消息对应的时间同步信息为offset，则最终的时间同步信息为common value+offset。从而UE可根据该最终的时间同步信息与基站进行同步，有助于减少同步开销。
可选的，UE在接收到该广播消息之后，UE可先不根据该广播消息携带的第二时间同步信息进行同步。如果UE在接收到广播消息之后的一定时间内接收到包括第一时间同步信息的专用消息，UE可根据该第二时间同步信息和该第一时间同步信息与基站进行同步。如果UE在该一定时间内未接收到专用消息，或者未接收到包括该第一时间同步信息的专用消息，UE还可自行进行传播时延补偿，比如确定目标传播时延补偿值，根据广播消息携带的时间同步信息和该目标传播时延补偿值与基站进行同步；或者，UE可直接根据该第二时间同步信息与基站进行同步，而不考虑传播时延补偿与否。
在本实施例中，基站可通过向小区中的UE发送广播消息以指示第二时间同步信息，基站还可在确定进行传播时延补偿时，向UE发送携带第一时间同步信息的专用消息，UE可基于该第一时间同步信息指示的传播时延补偿和该第二时间同步信息来实现UE和基站之间的时间同步，通过传播时延补偿，使得能够满足低时延要求，达到较高的时间同步精度，进而有助于提升数据传输的可靠性。
请参见图7，图7是本申请实施例提供的又一种时间同步方法的交互示意图。在本实施例中，在需要进行传播时延补偿时，网络设备可通过向终端发送携带第一时间同步信息的专用消息，来实现终端和网络设备之间的时间同步，该第一时间同步信息包括补偿了传播时延的时间同步信息，即第一时间同步信息指示的补偿情况为已补偿传播时延，由网络侧实现传播时延补偿。以终端为UE，网络设备为基站为例，如图7所示，该方法可以包括：
701、基站向UE发送广播消息，该广播消息包括第二时间同步信息，该第二时间同步信息为未补偿传播时延的同步信息。
在本实施例中，基站可通过广播消息指示时间同步信息，即该第二时间同步信息，该第二时间同步信息中不包含对传播时延进行的补偿。
可以理解，该广播消息中指示的第二时间同步信息，适用于该基站覆盖范围内的所有的UE。
702、UE根据该第二时间同步信息，进行与该基站之间的时间同步。
UE在接收到该广播消息之后，即可根据广播消息中通知的第二时间同步信息，与基站之间完成时间同步，如调整UE本地时钟与基站时钟相同。比如均为9点10分，误差不超过10us。
703、基站确定进行传播时延补偿。
704、基站向UE发送专用消息，该专用消息包括第一时间同步信息，该第一时间同步信息为补偿了传播时延的时间同步信息。
在本实施例中，如果基站确定对某些UE的时间同步信息，进行进一步的传播时延补偿时，基站可仅采用专用消息如dedicated RRC通知该UE补偿后的时间同步信息，即补偿了传播时延的时间同步信息，也即该第一时间同步信息。
在一种可能的设计中，基站确定进行传播时延补偿，可以是通过确定基站小区内是否存在需要进行传播时延补偿的UE来确定。例如，基站可在检测到与基站之间距离大于距离阈值的UE，和/或，与基站之间的RSRP小于功率阈值的UE，和/或，与基站之间的路损大于路损阈值的UE，和/或，不具备自行执行传播时延补偿的UE，等等，将这些UE作为需要进行传播时延补偿的UE，即确定进行传播时延补偿。进而基站可仅采用专用消息如dedicated RRC通知这些UE补偿了传播时延的时间同步信息，即该第一时间同步信息。
在一种可能的设计中，基站确定进行传播时延补偿，可以是通过检测是否需要进行传播时延补偿来确定。例如，基站可通过检测基站小区覆盖参数是否大于或等于对应的覆盖阈值，并在检测到小区覆盖参数大于或等于对应的覆盖阈值时，确定进行传播时延补偿。进而基站可向小区内的所有UE发送专用消息；或者，基站还可进一步确定发送专用消息的UE，如上述需要进行传播时延补偿的UE，向确定出的UE发送专用消息。
在一种可能的设计中，基站可在具备传播时延补偿能力时，确定进行传播时延补偿；和/或，在与UE传输的业务(数据)的类型为指定类型时，确定进行传播时延补偿以及确定出补偿的UE，此处不赘述。
在确定出补偿的UE之后，针对不同的UE，基站发送的专用消息携带的第一时间同步信息可以相同也可以不同。比如基站可针对每个UE分别根据对应的参数值确定传播时延补偿值之后，根据确定出的传播时延补偿值确定第一时间同步信息，进而向对应的UE发送包括该第一时间同步信息的专用消息。
705、UE根据该第一时间同步信息，进行与该基站之间的时间同步。
在本实施例中，收到包含了第一时间同步信息的专用消息如dedicated RRC的UE，可根据该专用消息中指示的第一时间同步信息，与基站进行时间同步，从而实现网络侧补偿。在可能的设计中，UE可分别根据第一时间同步信息和第二时间同步信息与基站进行同步(同步两次)，或者，UE可根据该第一时间同步信息和第二时间同步信息与基站进行同步(同步一次)，此处不赘述。本实施例以UE分别根据第一时间同步信息和第二时间同步信息与基站进行同步进行说明。
UE在根据第一时间同步信息与基站进行时间同步时，可根据该第一时间同步信息是否包含对传播时延的补偿，即该第一时间同步信息是否为补偿了传播时延的时间同步信息，来确定具体的补偿方式，如确定是网络补偿还是终端补偿。如果该第一时间同步信息为补偿了传播时延的时间同步信息，即为网络补偿，UE可根据该第一时间同步信息与基站进行同步；如果该第一时间同步信息为未补偿传播时延的时间同步信息，可以为终端补偿，则UE可根据第三时间同步信息如目标传播时延补偿值与基站进行同步，即终端可自行对收到的第一时间同步信息进行传播时延补偿，进而与基站进行同步。在本实施例中，该第一时间同步 信息为补偿了传播时延的时间同步信息，如UE可通过以下方式确定出。
在一种可能的设计中，只要UE收到包含了时间同步信息的专用消息如dedicated RRC，则可表明该第一时间同步信息为补偿了传播时延的时间同步信息，UE就认为网络对第一时间同步信息进行了传播时延补偿。进而UE可根据该第一时间同步信息，与基站进行同步。
在一种可能的设计中，该专用消息还可携带第一指示标识，UE可在检测到该第一指示标识时确定该第一时间同步信息为补偿了传播时延的时间同步信息。进而UE可根据该第一时间同步信息，与基站进行同步。
在本实施例中，基站可仅通过专用消息如dedicated RRC将补偿过传播时延的时间同步信息发送给UE，使得对于每个UE，网络可以实现补偿不同的传播时延补偿值，以提升基站发送给UE的时间同步信息的准确性，从而提升UE和基站间时间同步的可靠性，避免了时间同步信息不精确、同步不可靠导致无法满足业务传输需求的问题，有助于提升数据传输的可靠性。同时，避免了UE同时收到专用消息和广播消息的时间同步信息，但两个信息不同时，UE行为不确定的问题。
请参见图8，图8是本申请实施例提供的另一种时间同步方法的交互示意图。在本实施例中，网络设备可通过向终端发送携带第一时间同步信息的专用消息，来实现终端和网络设备之间的时间同步，该第一时间同步信息不包括补偿了传播时延的时间同步信息，即该第一时间同步信息为未补偿传播时延的时间同步信息，第一时间同步信息指示的补偿情况为未补偿传播时延，进而可由终端实现传播时延补偿。仍以终端为UE，网络设备为基站为例，如图8所示，该方法可以包括：
801、基站向UE发送广播消息，该广播消息包括第二时间同步信息，该第二时间同步信息为未补偿传播时延的同步信息。
在本实施例中，基站可通过广播消息指示时间同步信息，即该第二时间同步信息，该第二时间同步信息中不包含对传播时延进行的补偿。
802、UE根据该第二时间同步信息，进行与该基站之间的时间同步。
UE在接收到该广播消息之后，即可根据广播消息中通知的第二时间同步信息，与基站之间完成时间同步，如调整UE本地时钟与基站时钟相同。
803、基站确定进行传播时延补偿。
804、基站向UE发送专用消息，该专用消息包括第一时间同步信息，该第一时间同步信息为未补偿传播时延的时间同步信息。
在本实施例中，如果基站确定对某些UE的时间同步信息，进行进一步的传播时延补偿时，基站可仅采用专用消息如dedicated RRC通知第一时间同步信息，以指示传播时延补偿，或者说通过该专用消息指示传播时延补偿。
可选的，该基站确定进行传播时延补偿的方式可以参照上述实施例的相关描述，此处不赘述。在确定进行传播时延补偿之后，即可向对应的UE发送该专用消息。
805、UE进行传播时延补偿后，进行与该基站之间的时间同步。
在本实施例中，收到包含了第一时间同步信息的专用消息如dedicated RRC的UE，可根据该专用消息中指示的第一时间同步信息，与基站进行时间同步。
UE在根据第一时间同步信息与基站进行时间同步时，可根据该第一时间同步信息是否包含对传播时延 的补偿，即该第一时间同步信息是否为补偿了传播时延的时间同步信息，来确定具体的补偿方式，如确定是网络补偿还是终端补偿。如果该第一时间同步信息为补偿了传播时延的时间同步信息，即为网络补偿，UE可根据该第一时间同步信息与基站进行同步；如果该第一时间同步信息为未补偿传播时延的时间同步信息，可以为终端补偿，则UE可根据第三时间同步信息如目标传播时延补偿值与基站进行同步，即终端可自行对收到的第一时间同步信息进行传播时延补偿，进而与基站进行同步。在本实施例中，该第一时间同步信息为未补偿传播时延的时间同步信息，如UE可通过以下方式确定出。
在一种可能的设计中，如果UE收到的第一时间同步信息为空，可表明该第一时间同步信息为未补偿传播时延的时间同步信息，UE可认为网络没有对第一时间同步信息进行传播时延补偿。
在一种可能的设计中，该专用消息还可携带第二指示标识，以表明未进行补偿；或者该专用消息未携带指示标识时，以表明未进行补偿。
UE在确定该第一时间同步信息为未补偿传播时延的时间同步信息之后，如果该UE具备传播时延补偿能力，还可进行传播时延补偿，比如获取目标传播时延补偿值对该第一时间同步信息进行补偿，进而基于补偿后的第一时间同步信息与基站进行同步；或者，UE可根据目标传播时延补偿值对第二时间同步信息进行传播时延补偿后与基站进行同步；或者可分别根据该第一同步信息和该目标传播时延补偿值与基站进行同步。其中，确定该目标传播时延补偿值的方式可以参照上述实施例的相关描述，此处不赘述。
在其他可选的实施例中，如果UE确定网络侧未进行传播时延补偿，比如UE未收到包括第一时间同步信息的专用消息，或者在一定时间内未收到包括第一时间同步信息的专用消息，如在接收到广播消息之后的一定时间内(如第一时间内，该第一时间可预先设置得到，或者由网络侧通知得到)未接收到专用消息，UE可自行进行传播时延补偿，比如按照目标传播时延补偿值进行补偿，与基站进行同步，或者，UE可直接根据第二时间同步信息进行同步，而不考虑传播时延补偿与否。
在一种可能的设计中，UE确定目标传播时延补偿值之前，即UE确定进行传播时延补偿之前，还可根据该UE对应的参数值是否满足对应条件，并在满足时(如与基站之间距离大于距离阈值等)，再确定需要自行对收到的第一时间同步信息进行传播时延补偿。
在本实施例中，基站可仅通过专用消息如dedicated RRC将未补偿传播时延的时间同步信息发送给UE，使得UE能够根据该专用消息的指示进行传播时延补偿，从而能够基于UE侧补偿提升UE和基站间时间同步的可靠性，避免了时间同步信息不精确、同步不可靠导致无法满足业务传输需求的问题，有助于提升数据传输的可靠性。同时，避免了UE同时收到专用消息和广播消息的时间同步信息，但两个信息不同时，UE行为不确定的问题。
请参见图9，图9是本申请实施例提供的又一种时间同步方法的交互示意图。在本实施例中，网络设备可通过向终端发送携带第二时间同步信息的广播消息和携带第一时间同步信息的专用消息，来实现终端和网络设备之间的时间同步，该第一时间同步信息和第二同步信息均包括补偿了传播时延的时间同步信息。通过广播消息对小区内的终端进行传播时延补偿后，还可通过专用消息携带的时间同步信息对部分终端进行进一步补偿。以终端为UE，网络设备为基站为例，如图9所示，该方法可以包括：
901、基站向UE发送广播消息，该广播消息包括第二时间同步信息，该第二时间同步信息为补偿了传播时延的同步信息。
在本实施例中，基站可通过广播消息指示时间同步信息，即该第二时间同步信息，该第二时间同步信息中包含对传播时延进行的补偿。
在一种可能的设计中，基站可检测是否进行传播时延补偿，或者确定该小区内是否存在需要进行传播时延补偿的UE。进而在确定进行传播时延补偿时，基站可采用广播通知补偿了传播时延的时间同步信息，即该第二时间同步信息，该第二时间同步信息由基站广播给该小区内的UE。例如，基站可在检测到与基站之间距离大于距离阈值的UE，或者，与基站之间的RSRP小于功率阈值的UE，或者，与基站之间的路损大于路损阈值的UE，或者，不具备自行执行传播时延补偿的UE时，确定进行传播时延补偿，其与发送专用消息时确定进行传播时延补偿的方式类似，具体可参照上述实施例的相关描述，此处不赘述。
在一种可能的设计中，基站可根据预设的传播时延补偿值确定该第二时间同步信息，比如在原有时间同步信息的基础上通过该传播时延补偿值进行补偿后得到该第二时间同步信息，或者可在该广播消息中直接携带该传播时延补偿值；或者，基站可根据参数值确定传播时延补偿值之后再根据该传播时延补偿值确定第二时间同步信息。可选的，该确定传播时延补偿值以及根据传播时延补偿值确定第二时间同步信息的方式，与上述确定第一时间同步信息对应的传播时延补偿值及根据传播时延补偿值确定第一时间同步信息的方式类似，此处不赘述；或者，基站可根据各UE对应的参数值的平均值确定该传播时延补偿值，等等，本申请不做限定。
902、UE根据该第二时间同步信息，进行与该基站之间的时间同步。
UE在接收到该广播消息之后，即可根据广播消息中通知的第二时间同步信息，与基站之间完成时间同步，如调整UE本地时钟与基站时钟相同。
903、基站确定进行传播时延补偿。
904、基站向UE发送专用消息，该专用消息包括第一时间同步信息，该第一时间同步信息为补偿了传播时延的时间同步信息。
905、UE根据该第一时间同步信息，进行与该基站之间的时间同步。
在本实施例中，如果基站确定对某些UE的时间同步信息，进行进一步的传播时延补偿(修正)时，基站可仅采用专用消息如dedicated RRC通知该UE补偿后的时间同步信息，即补偿了传播时延的时间同步信息，也即该第一时间同步信息。该步骤903-905的描述可参照上述实施例的相关描述，此处不赘述。通过实施本申请实施例，当一部分UE的传播时延补偿值相同时，网络可先通过广播通知该相同的时间同步信息，再对剩下的UE的用专用消息如dedicated RRC通知同步时间信息，可以减少dedicated RRC的信令开销。
在可能的设计中，该第一时间同步信息可以包括与该第二时间同步信息指示的时间之间的时间偏移值，进而UE可根据第二时间同步信息指示的时间与该时间偏移值，与基站进行同步。比如网络可先通过广播通知补偿了传播时延的时间同步信息如common value，再用dedicated RRC通知补偿了传播时延的时间同步信息如offset，以减少仅在dedicate RRC消息中通知完整的同步时钟信息需要的信令开销。
可以理解，如果基站确定无需对小区中的UE进行进一步的传播时延补偿，可不执行步骤903-905，仅通过广播消息实现补偿即可。
在一种可能的设计中，如果基站确定无需对小区中的UE进行进一步的传播时延补偿，对于具备传播时延补偿能力的UE，UE还可在接收到广播消息后，自行确定是否进一步补偿。例如，UE可在接收到广播消 息时启动定时器，如果在该定时器时长内接收到专用消息，UE可认为网络补偿，如果该定时器时长内未接收到专用消息，UE可以自行补偿补偿(补偿方式可参照上述实施例中相关描述，此处不赘述)，或者不补偿。也就是说，UE可在接收到广播消息之后的一定时间范围内接收到专用消息时，根据专用消息进行同步，在该一定时间范围内未接收到专用消息时，UE自行补偿或不补偿，以进行同步。
在本实施例中，当收到不同类型的消息(专用消息如dedicated RRC和广播消息)通知的时间同步信息时，对于UE采用哪个消息确定时间同步信息的方式，明确了UE的行为。且通过广播消息携带补偿了传播时延的时间同步信息来同步，有助于减少包含了时间同步信息的专用消息的发送频率和信令开销，因为部分UE通过广播消息补偿了传播时延的时间同步信息进行同步后可能无需进行进一步补偿，因此无需再发专用消息。
请参见图10，图10是本申请实施例提供的又一种时间同步方法的交互示意图。在本实施例中，网络设备可通过向终端发送携带第二时间同步信息的广播消息和携带第一时间同步信息的专用消息，来实现终端和网络设备之间的时间同步。该第二同步信息包括补偿了传播时延的时间同步信息，该第一时间同步信息为未补偿传播时延的时间同步信息，可由终端进行进一步补偿，由此能够实现通过广播消息对小区内的终端进行传播时延补偿后，还可通过专用消息指示部分终端进行进一步补偿。以终端为UE，网络设备为基站为例，如图10所示，该方法可以包括：
1001、基站向UE发送广播消息，该广播消息包括第二时间同步信息，该第二时间同步信息为补偿了传播时延的同步信息。
1002、UE根据该第二时间同步信息，进行与该基站之间的时间同步。
其中，该步骤1001-1002的描述可参照上述图9所示实施例中步骤901-902的相关描述，此处不赘述。
1003、基站确定进行传播时延补偿。
1004、基站向UE发送专用消息，该专用消息包括第一时间同步信息，该第一时间同步信息为未补偿传播时延的时间同步信息。
1005、UE进行传播时延补偿后，进行与该基站之间的时间同步。
其中，该步骤1003-1005的描述可参照上述图8所示实施例中步骤803-805的相关描述，此处不赘述。
在本实施例中，当收到不同类型的消息(专用消息如dedicated RRC和广播消息)通知的时间同步信息时，对于UE采用哪个消息确定时间同步信息的方式，明确了UE的行为。且通过广播消息携带补偿了传播时延的时间同步信息来同步，有助于减少包含了时间同步信息的专用消息的发送频率和信令开销，并能够通过专用消息指示UE进行传播时延补偿，能够进一步减小信令开销。
可以理解，上述方法实施例都是对本申请的时间同步方法的举例说明，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见其他实施例的相关描述。
请参见图11，是本申请实施例提供的一种终端的结构示意图。如图11所示，该终端1100可包括：处理器1110、存储器1120、通信接口1130以及一个或多个程序1121，其中，所述一个或多个程序1121被存储在所述存储器1120中，并且被配置由所述处理器1110执行，所述程序包括用于执行以下步骤的指令：
通过通信接口1130接收来自网络设备的专用消息，所述专用消息包括第一时间同步信息，所述第一时间同步信息用于指示传播时延的补偿情况；
根据所述第一时间同步信息，进行与所述网络设备之间的时间同步。
在一种可能的设计中，所述补偿情况为未补偿所述传播时延，且所述终端为具备传播时延补偿能力的终端；所述程序中的指令还用于执行以下操作：
对所述第一时间同步信息进行传播时延补偿；
根据补偿后的所述第一时间同步信息，进行与所述网络设备之间的时间同步。
在一种可能的设计中，在对所述第一时间同步信息进行传播时延补偿时，所述程序中的指令具体用于执行以下操作：
根据参数值从多个传播时延补偿值中确定目标传播时延补偿值；
根据所述目标传播时延补偿对所述第一时间同步信息进行传播时延补偿；
其中，所述参数值包括以下任一项或多项：
所述终端与所述网络设备之间的距离、所述终端与所述网络设备之间的参考信号接收功率、所述终端与所述网络设备之间的路径损耗值、所述网络设备对应的小区覆盖参数。
在一种可能的设计中，所述程序中的指令还用于执行以下操作：
通过通信接口1130接收来自所述网络设备的广播消息，所述广播消息包括第二时间同步信息；
所述程序中的指令还用于执行以下操作：根据所述第二时间同步信息，进行与所述网络设备之间的时间同步，和/或，在根据所述第一时间同步信息，进行与所述网络设备之间的时间同步时，所述程序中的指令具体用于执行以下操作：
根据所述第一时间同步信息以及所述第二时间同步信息，确定用于进行与所述网络设备之间的时间同步的目标时间同步信息；
根据所述目标时间同步信息进行与所述网络设备之间的时间同步。
在一种可能的设计中，在根据所述目标时间同步信息进行与所述网络设备之间的时间同步时，所述程序中的指令具体用于执行以下操作：
确定所述目标时间同步信息包括所述第一时间同步信息以及所述第二时间同步信息；
根据所述第一时间同步信息以及所述第二时间同步信息，进行与所述网络设备之间的时间同步。
在一种可能的设计中，在所述补偿情况为已补偿所述传播时延，且所述第一时间同步信息包括与所述第二时间同步信息指示的时间之间的时间偏移值的情况下，在根据所述第一时间同步信息和所述第二时间同步信息，进行与所述网络设备之间的时间同步时，所述程序中的指令具体用于执行以下操作：
根据所述第二时间同步信息指示的时间与所述时间偏移值，进行与所述网络设备之间的时间同步。
在一种可能的设计中，在根据所述目标时间同步信息进行与所述网络设备之间的时间同步时，所述程序中的指令具体用于执行以下操作：
在所述第一时间同步信息与所述第二时间同步信息不同的情况下，确定所述目标时间同步信息包括所述第一时间同步信息；
根据所述第一时间同步信息进行与所述网络设备之间的时间同步。
在一种可能的设计中，所述专用消息为专用无线资源控制RRC消息或专用媒体接入控制MAC消息或专用下行控制信息DCI。
请参见图12，是本申请实施例提供的一种网络设备的结构示意图。如图12所示，该网络设备1200可包括：处理器1210、存储器1220、通信接口1230以及一个或多个程序1221，其中，所述一个或多个程序1221被存储在所述存储器1220中，并且被配置由所述处理器1210执行，所述程序包括用于执行以下步骤的指令；
确定进行传播时延补偿；
通过通信接口1230向终端发送专用消息，所述专用消息包括第一时间同步信息，所述第一时间同步信息用于指示传播时延的补偿情况。
在一种可能的设计中，所述终端为参数值满足对应条件的终端，和/或，所述终端为不具备传播时延补偿能力的终端，和/或，所述终端为处于所述网络设备对应小区的终端；
其中，所述参数值包括以下任一项或多项：
终端与所述网络设备之间的距离、终端与所述网络设备之间的参考信号接收功率、终端与所述网络设备之间的路径损耗值、所述网络设备对应的小区覆盖参数。
在一种可能的设计中，所述网络设备对应的小区覆盖参数大于覆盖阈值，和/或，所述网络设备具备传播时延补偿能力。
在一种可能的设计中，所述补偿情况为已补偿所述传播时延，在所述网络设备向终端发送专用消息之前，所述程序中的指令还用于执行以下操作：
根据参数值确定传播时延补偿值；
根据所述传播时延补偿值确定所述第一时间同步信息；
其中，所述参数值包括以下任一项或多项：
终端与所述网络设备之间的距离、终端与所述网络设备之间的参考信号接收功率、终端与所述网络设备之间的路径损耗值、所述网络设备对应的小区覆盖参数。
在一种可能的设计中，所述补偿情况为未补偿所述传播时延，所述第一时间同步信息为未补偿传播时延的时间同步信息，且所述终端为具备传播时延补偿能力的终端。
在一种可能的设计中，所述程序中的指令还用于执行以下操作：
通过通信接口1230向所述终端发送广播消息，所述广播消息包括第二时间同步信息。
在一种可能的设计中，所述补偿情况为已补偿所述传播时延，所述第一时间同步信息包括与所述第二时间同步信息指示的时间之间的时间偏移值。
在一种可能的设计中，所述专用消息为专用无线资源控制RRC消息或专用媒体接入控制MAC消息或专用下行控制信息DCI。
上述主要从各个网元之间交互的角度对本申请实施例的方案进行了介绍。终端和网络设备为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。
本申请实施例可以根据上述方法示例对终端和网络设备进行功能单元的划分，例如，可以对应各个功能划分各个功能单元，也可以将两个或两个以上的功能集成在一个处理单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件程序模块的形式实现。需要说明的是，本申请实施例中对单元的划分 是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
请参见图13，图13示出了上述实施例中所涉及的终端的另一种可能的结构示意图。参阅图13所示，该终端1300可包括：通信单元1301和处理单元1302。其中，这些单元可以执行上述方法示例中终端的相应功能。处理单元1302用于对终端的动作进行控制管理，例如，处理单元1302用于支持终端执行图3中的步骤301至302、图5中的502、505、图6中的604、图7中的702、705、图8中的802、805、图9中的902、905、图10中的1002、1005，和/或用于本文所描述的技术的其它过程。通信单元1301可用于支持终端与其他设备的通信，例如与网络设备之间的通信。可选的，终端还可以包括存储单元1303，用于存储网络设备的程序代码和数据。
其中，处理单元1302可以是处理器或控制器，例如可以是中央处理器(Central Processing Unit，CPU)，通用处理器，数字信号处理器(Digital Signal Processor，DSP)，专用集成电路(Application-Specific Integrated Circuit，ASIC)，现场可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。通信单元1301可以是收发器、收发电路、射频芯片等，存储单元1303可以是存储器。
例如，通信单元1301，用于接收来自网络设备的专用消息，所述专用消息包括第一时间同步信息，所述第一时间同步信息用于指示传播时延的补偿情况；
处理单元1302，用于根据所述第一时间同步信息，进行与所述网络设备之间的时间同步。
在一种可能的设计中，所述补偿情况为未补偿所述传播时延，且所述终端为具备传播时延补偿能力的终端；
处理单元1302，具体用于对所述第一时间同步信息进行传播时延补偿；根据补偿后的所述第一时间同步信息，进行与所述网络设备之间的时间同步。
在一种可能的设计中，处理单元1302，具体用于根据参数值从多个传播时延补偿值中确定目标传播时延补偿值；根据所述目标传播时延补偿对所述第一时间同步信息进行传播时延补偿；其中，所述参数值包括以下任一项或多项：
所述终端与所述网络设备之间的距离、所述终端与所述网络设备之间的参考信号接收功率、所述终端与所述网络设备之间的路径损耗值、所述网络设备对应的小区覆盖参数。
在一种可能的设计中，通信单元1301，还可用于接收来自所述网络设备的广播消息，所述广播消息包括第二时间同步信息；
处理单元1302，可具体用于根据所述第一时间同步信息以及所述第二时间同步信息，确定用于进行与所述网络设备之间的时间同步的目标时间同步信息；根据所述目标时间同步信息进行与所述网络设备之间的时间同步。
在一种可能的设计中，处理单元1302，可具体用于确定所述目标时间同步信息包括所述第一时间同步信息以及所述第二时间同步信息；根据所述第一时间同步信息以及所述第二时间同步信息，进行与所述网络设备之间的时间同步。
在一种可能的设计中，在所述补偿情况为已补偿所述传播时延，且所述第一时间同步信息包括与所述第二时间同步信息指示的时间之间的时间偏移值的情况下；
处理单元1302，可具体用于根据所述第二时间同步信息指示的时间与所述时间偏移值，进行与所述网络设备之间的时间同步。
在一种可能的设计中，处理单元1302，可具体用于在所述第一时间同步信息与所述第二时间同步信息不同的情况下，确定所述目标时间同步信息包括所述第一时间同步信息；根据所述第一时间同步信息进行与所述网络设备之间的时间同步。
在一种可能的设计中，所述专用消息为专用无线资源控制RRC消息或专用媒体接入控制MAC消息或专用下行控制信息DCI。
当处理单元1302为处理器，通信单元1301为通信接口，存储单元1303为存储器时，本申请实施例所涉及的终端可以为图11所示的终端。
可选的，该终端可通过上述单元实现上述图3至图10所示实施例中的方法中终端执行的部分或全部步骤。应理解，本申请实施例是对应方法实施例的装置实施例，对方法实施例的描述，也适用于本申请实施例，此处不赘述。
请参见图14，图14示出了上述实施例中所涉及的网络设备的另一种可能的结构示意图。参阅图14所示，该网络设备1400可包括：处理单元1401和通信单元1402。其中，这些单元可以执行上述方法示例中网络设备的相应功能。处理单元1401用于对网络设备的动作进行控制管理，例如，处理单元1401用于支持网络设备执行图4中的步骤401至402、图5中的503、图6中的602、图7中的703、图8中的803、图9中的903、图10中的1003，和/或用于本文所描述的技术的其它过程。通信单元1402可用于支持网络设备与其他设备的通信，例如与终端之间的通信。网络设备还可以包括存储单元1403，用于存储网络设备的程序代码和数据。
其中，处理单元1401可以是处理器或控制器，通信单元1402可以是收发器、收发电路、射频芯片等，存储单元1403可以是存储器。
例如，处理单元1401，用于确定进行传播时延补偿；
通信单元，用于向终端发送专用消息，所述专用消息包括第一时间同步信息，所述第一时间同步信息用于指示传播时延的补偿情况。
在一种可能的设计中，所述终端为参数值满足对应条件的终端，和/或，所述终端为不具备传播时延补偿能力的终端，和/或，所述终端为处于所述网络设备对应小区的终端；
其中，所述参数值包括以下任一项或多项：
终端与所述网络设备之间的距离、终端与所述网络设备之间的参考信号接收功率、终端与所述网络设备之间的路径损耗值、所述网络设备对应的小区覆盖参数。
在一种可能的设计中，所述网络设备对应的小区覆盖参数大于覆盖阈值，和/或，所述网络设备具备传播时延补偿能力。
在一种可能的设计中，所述补偿情况为已补偿所述传播时延；
处理单元1401，还可用于根据参数值确定传播时延补偿值；根据所述传播时延补偿值确定所述第一时间同步信息；
其中，所述参数值包括以下任一项或多项：
终端与所述网络设备之间的距离、终端与所述网络设备之间的参考信号接收功率、终端与所述网络设备之间的路径损耗值、所述网络设备对应的小区覆盖参数。
在一种可能的设计中，所述补偿情况为未补偿所述传播时延，，且所述终端为具备传播时延补偿能力的终端。
在一种可能的设计中，通信单元1402，还可用于向所述终端发送广播消息，所述广播消息包括第二时间同步信息。
在一种可能的设计中，所述补偿情况为已补偿所述传播时延，所述第一时间同步信息包括与所述第二时间同步信息指示的时间之间的时间偏移值。
在一种可能的设计中，所述专用消息为专用无线资源控制RRC消息或专用媒体接入控制MAC消息或专用下行控制信息DCI。
当处理单元1401为处理器，通信单元1402为通信接口，存储单元1403为存储器时，本申请实施例所涉及的终端可以为图12所示的网络设备。
可选的，该网络设备可通过上述单元实现上述图3至图10所示实施例中的方法中网络设备执行的部分或全部步骤。应理解，本申请实施例是对应方法实施例的装置实施例，对方法实施例的描述，也适用于本申请实施例，此处不赘述。
可以理解，本申请实施例中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。本申请实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
本申请还提供了一种通信系统，该系统包括上述的终端和/或网络设备。可选的，该系统还可以包括本申请实施例提供的方案中与上述网元进行交互的其他设备。网络设备和/或终端可执行上述图3至图10所示实施例中的方法中的部分或全部步骤，具体可参照上述实施例的相关描述，此处不赘述。
本申请实施例还提供了一种计算机可读存储介质，其中，所述计算机可读存储介质存储用于电子数据交换的计算机程序，其中，所述计算机程序使得计算机执行如上述方法实施例中终端或网络设备所描述的部分或全部步骤。
本申请实施例还提供了一种计算机程序产品，其中，所述计算机程序产品包括存储了计算机程序的非瞬时性计算机可读存储介质，所述计算机程序可操作来使计算机执行如上述方法实施例中终端或网络设备所描述的部分或全部步骤。该计算机程序产品可以为一个软件安装包。
结合本申请公开内容所描述的方法或者算法的步骤可以硬件的方式来实现，也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于随机存取存储器(Random Access Memory，RAM)、闪存、只读存储器(Read Only Memory，ROM)、可擦除可编程只读存储器(Erasable Programmable ROM，EPROM)、电可擦可编程只读存储器(Electrically EPROM，EEPROM)、寄存器、硬盘、移动硬盘、只读光盘(CD-ROM)或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。 当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于通信装置如终端、网络设备中。当然，处理器和存储介质也可以作为分立组件存在于通信装置中。
可以理解，本文中涉及的第一、第二、第三以及各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围。
可以理解，本文中“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本申请实施例所描述的功能可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(Digital Subscriber Line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，数字视频光盘(Digital Video Disc，DVD))、或者半导体介质(例如，固态硬盘(Solid State Disk，SSD))等。

Claims (22)

  1. 一种时间同步方法，其特征在于，包括：
    终端接收来自网络设备的专用消息，所述专用消息包括第一时间同步信息，所述第一时间同步信息用于指示传播时延的补偿情况；
    所述终端根据所述第一时间同步信息，进行与所述网络设备之间的时间同步。
  2. 根据权利要求1所述的方法，其特征在于，在所述补偿情况为未补偿所述传播时延，且所述终端具备传播所述时延补偿的能力的情况下；所述方法还包括：
    所述终端对所述第一时间同步信息进行传播时延补偿；
    所述终端根据所述第一时间同步信息，进行与所述网络设备之间的时间同步，包括：
    所述终端根据补偿后的所述第一时间同步信息，进行与所述网络设备之间的时间同步。
  3. 根据权利要求2所述的方法，其特征在于，所述终端对所述第一时间同步信息进行传播时延补偿，包括：
    所述终端根据参数值从多个传播时延补偿值中确定目标传播时延补偿值；
    所述终端根据所述目标传播时延补偿对所述第一时间同步信息进行传播时延补偿；
    其中，所述参数值包括以下任一项或多项：
    所述终端与所述网络设备之间的距离、所述终端与所述网络设备之间的参考信号接收功率、所述终端与所述网络设备之间的路径损耗值、所述网络设备对应的小区覆盖参数。
  4. 根据权利要求1-3任一项所述的方法，其特征在于，所述方法还包括：
    所述终端接收来自所述网络设备的广播消息，所述广播消息包括第二时间同步信息；
    所述终端根据所述第一时间同步信息，进行与所述网络设备之间的时间同步，包括：
    所述终端根据所述第一时间同步信息以及所述第二时间同步信息，确定用于进行与所述网络设备之间的时间同步的目标时间同步信息；
    所述终端根据所述目标时间同步信息进行与所述网络设备之间的时间同步。
  5. 根据权利要求4所述的方法，其特征在于，所述终端根据所述目标时间同步信息进行与所述网络设备之间的时间同步，包括：
    所述终端确定所述目标时间同步信息包括所述第一时间同步信息以及所述第二时间同步信息；
    所述终端根据所述第一时间同步信息以及所述第二时间同步信息，进行与所述网络设备之间的时间同步。
  6. 根据权利要求5所述的方法，其特征在于，在所述补偿情况为已补偿所述传播时延，且所述第一时间同步信息包括与所述第二时间同步信息指示的时间之间的时间偏移值的情况下，所述终端根据所述第一时间同步信息以及所述第二时间同步信息，进行与所述网络设备之间的时间同步，包括：
    所述终端根据所述第二时间同步信息指示的时间与所述时间偏移值，进行与所述网络设备之间的时间同步。
  7. 根据权利要求4所述的方法，其特征在于，所述终端根据所述目标时间同步信息进行与所述网络设备之间的时间同步，包括：
    在所述第一时间同步信息与所述第二时间同步信息不同的情况下，所述终端确定所述目标时间同步信息包括所述第一时间同步信息；
    所述终端根据所述第一时间同步信息进行与所述网络设备之间的时间同步。
  8. 根据权利要求1所述的方法，其特征在于，所述专用消息为专用无线资源控制RRC消息或专用媒体接入控制MAC消息或专用下行控制信息DCI。
  9. 一种时间同步方法，其特征在于，包括：
    网络设备确定进行传播时延补偿；
    所述网络设备向终端发送专用消息，所述专用消息包括第一时间同步信息，所述第一时间同步信息用于指示传播时延的补偿情况。
  10. 根据权利要求9所述的方法，其特征在于，所述终端为参数值满足对应条件的终端，和/或，所述终端为不具备传播时延补偿能力的终端，和/或，所述终端为处于所述网络设备对应小区的终端；
    其中，所述参数值包括以下任一项或多项：
    终端与所述网络设备之间的距离、终端与所述网络设备之间的参考信号接收功率、终端与所述网络设备之间的路径损耗值、所述网络设备对应的小区覆盖参数。
  11. 根据权利要求9所述的方法，其特征在于，所述网络设备对应的小区覆盖参数大于或等于覆盖阈值，和/或，所述网络设备具备传播时延补偿能力。
  12. 根据权利要求9-11任一项所述的方法，其特征在于，所述补偿情况为已补偿所述传播时延，在所述网络设备向终端发送专用消息之前，所述方法还包括：
    所述网络设备根据参数值确定传播时延补偿值；
    所述网络设备根据所述传播时延补偿值确定所述第一时间同步信息；
    其中，所述参数值包括以下任一项或多项：
    终端与所述网络设备之间的距离、终端与所述网络设备之间的参考信号接收功率、终端与所述网络设备之间的路径损耗值、所述网络设备对应的小区覆盖参数。
  13. 根据权利要求9-11任一项所述的方法，其特征在于，所述补偿情况为未补偿所述传播时延，且所述终端为具备传播时延补偿能力的终端。
  14. 根据权利要求9所述的方法，其特征在于，所述方法还包括：
    所述网络设备向所述终端发送广播消息，所述广播消息包括第二时间同步信息。
  15. 根据权利要求14所述的方法，其特征在于，所述补偿情况为已补偿所述传播时延，所述第一时间同步信息包括与所述第二时间同步信息指示的时间之间的时间偏移值。
  16. 根据权利要求9所述的方法，其特征在于，所述专用消息为专用无线资源控制RRC消息或专用媒体接入控制MAC消息或专用下行控制信息DCI。
  17. 一种终端，其特征在于，包括通信单元和处理单元；
    所述通信单元，用于接收来自网络设备的专用消息，所述专用消息包括第一时间同步信息，所述第一时间同步信息用于指示传播时延的补偿情况；
    所述处理单元，用于根据所述第一时间同步信息，进行与所述网络设备之间的时间同步。
  18. 一种网络设备，其特征在于，包括处理单元和通信单元；
    所述通信单元，用于确定进行传播时延补偿；
    所述通信单元，用于向终端发送专用消息，所述专用消息包括第一时间同步信息，所述第一时间同步信息用于指示传播时延的补偿情况。
  19. 一种终端，其特征在于，包括处理器、存储器、通信接口，以及一个或多个程序，所述一个或多个程序被存储在所述存储器中，并且被配置由所述处理器执行，所述程序包括用于执行如权利要求1-8任一项所述的方法中的步骤的指令。
  20. 一种网络设备，其特征在于，包括处理器、存储器、通信接口，以及一个或多个程序，所述一个或多个程序被存储在所述存储器中，并且被配置由所述处理器执行，所述程序包括用于执行如权利要求9-16任一项所述的方法中的步骤的指令。
  21. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机程序，所述计算机程序使得计算机执行如权利要求1-8任一项所述的方法。
  22. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机程序，所述计算机程序使得计算机执行如权利要求9-16任一项所述的方法。
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114422069A (zh) * 2022-01-04 2022-04-29 烽火通信科技股份有限公司 FlexE业务的时延处理方法、装置、设备及存储介质
GB2606363A (en) * 2021-05-04 2022-11-09 Canon Kk Controlling time synchronisation in a wireless network

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114727257B (zh) * 2022-06-09 2022-09-16 广州世炬网络科技有限公司 基于侧链通信的信号同步方法、装置、设备及存储介质
CN117812685A (zh) * 2022-09-30 2024-04-02 华为技术有限公司 一种信息传输方法、装置和系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106102180A (zh) * 2016-08-05 2016-11-09 宇龙计算机通信科技(深圳)有限公司 一种上行传输的方法及基站
CN107734631A (zh) * 2016-08-11 2018-02-23 电信科学技术研究院 一种时序调整方法、基站、终端及通信系统
CN107889261A (zh) * 2016-09-30 2018-04-06 华为技术有限公司 通信方法、基站和终端设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101925172B (zh) * 2010-07-20 2016-05-18 北京新岸线移动通信技术有限公司 一种时间同步方法及装置
US10582465B2 (en) * 2015-12-21 2020-03-03 Telefonaktiebolaget Lm Ericsson (Publ) Methods and arrangements for configuration of radio interface based synchronisation
CN109151920B (zh) * 2017-06-16 2021-07-20 成都鼎桥通信技术有限公司 同步信号的发送方法和基站

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106102180A (zh) * 2016-08-05 2016-11-09 宇龙计算机通信科技(深圳)有限公司 一种上行传输的方法及基站
CN107734631A (zh) * 2016-08-11 2018-02-23 电信科学技术研究院 一种时序调整方法、基站、终端及通信系统
CN107889261A (zh) * 2016-09-30 2018-04-06 华为技术有限公司 通信方法、基站和终端设备

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
VIVO: "Propagation delay compensation for reference time", 3GPP TSG-RAN WG2 MEETING #106 R2-1905759, 17 May 2019 (2019-05-17), XP051710112 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2606363A (en) * 2021-05-04 2022-11-09 Canon Kk Controlling time synchronisation in a wireless network
CN114422069A (zh) * 2022-01-04 2022-04-29 烽火通信科技股份有限公司 FlexE业务的时延处理方法、装置、设备及存储介质
CN114422069B (zh) * 2022-01-04 2023-12-05 烽火通信科技股份有限公司 FlexE业务的时延处理方法、装置、设备及存储介质

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