WO2021168807A1 - 时间同步方法、终端设备和网络设备 - Google Patents

时间同步方法、终端设备和网络设备 Download PDF

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Publication number
WO2021168807A1
WO2021168807A1 PCT/CN2020/077222 CN2020077222W WO2021168807A1 WO 2021168807 A1 WO2021168807 A1 WO 2021168807A1 CN 2020077222 W CN2020077222 W CN 2020077222W WO 2021168807 A1 WO2021168807 A1 WO 2021168807A1
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Prior art keywords
terminal device
information
random access
propagation delay
rrc
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PCT/CN2020/077222
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English (en)
French (fr)
Inventor
付喆
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Oppo广东移动通信有限公司
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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 CN202211398312.3A priority Critical patent/CN115623581A/zh
Priority to JP2022549235A priority patent/JP2023521538A/ja
Priority to KR1020227031344A priority patent/KR20220149685A/ko
Priority to CN202080087357.1A priority patent/CN114830799A/zh
Priority to PCT/CN2020/077222 priority patent/WO2021168807A1/zh
Priority to EP20920843.8A priority patent/EP4087361A4/en
Publication of WO2021168807A1 publication Critical patent/WO2021168807A1/zh
Priority to US17/817,255 priority patent/US20220377691A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/005—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by adjustment in the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/003—Arrangements to increase tolerance to errors in transmission or reception timing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • This application relates to the field of communications, and more specifically, to a time synchronization method, terminal equipment, and network equipment.
  • UE User Equipment
  • the UE may use TA (timing advance; also known as time alignment) information to compensate for propagation delay.
  • TA timing advance; also known as time alignment
  • the UE has different ways to acquire TA in the idle state and the connected state. In the connected state (connected), the UE obtains TA information according to the TAC (TA command) sent by the network, and performs synchronization calibration.
  • the embodiments of the present application provide a time synchronization method, terminal equipment, and network equipment.
  • the terminal equipment can obtain effective TA information and perform time synchronization in various scenarios.
  • the embodiment of the present application provides a time synchronization method, including:
  • the terminal equipment obtains the timing advance TA information through the random access process
  • the terminal device uses the TA information for time synchronization.
  • the embodiment of the present application provides a time synchronization method, including:
  • the network device sends the timing advance TA information through the random access process, and the TA information is used to instruct the terminal device to perform time synchronization.
  • the embodiment of the present application provides a terminal device including a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory to execute the above-mentioned time synchronization method.
  • the embodiment of the present application provides a network device including a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory to execute the above-mentioned time synchronization method.
  • the embodiment of the present application provides a chip for implementing the above-mentioned time synchronization method.
  • the chip includes: a processor, configured to call and run a computer program from the memory, so that the device installed with the chip executes the above-mentioned time synchronization method.
  • the embodiment of the present application provides a computer-readable storage medium for storing a computer program, and the computer program causes a computer to execute the above-mentioned time synchronization method.
  • the embodiment of the present application provides a computer program product, including computer program instructions, and the computer program instructions cause a computer to execute the above-mentioned time synchronization method.
  • the embodiment of the present application provides a computer program that, when running on a computer, causes the computer to execute the above-mentioned time synchronization method.
  • An embodiment of the application provides a communication system, including:
  • the terminal device is used to execute the time synchronization method executed by the terminal device of any embodiment of the present application;
  • the network device is used to execute the time synchronization method executed by the network device in any embodiment of the present application.
  • a random access process such as a random access process by a terminal device
  • a random access process such as a random access process
  • Fig. 1 is a schematic diagram of an application scenario according to an embodiment of the present application.
  • Figure 2 is a schematic diagram of the clock synchronization timing relationship between the UE and the network.
  • Figure 3 is a schematic diagram of MAC RAR response.
  • Figure 4 is a schematic diagram of contention-based random access in a four-step random access process.
  • Figure 5 is a schematic diagram of random access based on non-contention in a four-step random access process.
  • Figure 6 is a schematic diagram of a two-step random access process.
  • Fig. 7 is a schematic flowchart of a time synchronization method according to an embodiment of the present application.
  • FIG. 8 is a schematic flowchart of a time synchronization method according to another embodiment of the present application.
  • Fig. 9 is a schematic block diagram of a terminal device according to an embodiment of the present application.
  • Fig. 10 is a schematic block diagram of a terminal device according to another embodiment of the present application.
  • Fig. 11 is a schematic block diagram of a network device according to an embodiment of the present application.
  • Fig. 12 is a schematic block diagram of a network device according to another embodiment of the present application.
  • Fig. 13 is a schematic block diagram of a communication device according to an embodiment of the present application.
  • Fig. 14 is a schematic block diagram of a chip according to an embodiment of the present application.
  • Fig. 15 is a schematic block diagram of a communication system according to an embodiment of the present application.
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • NR New Radio
  • evolution system of NR system LTE (LTE-based access to unlicensed spectrum, LTE-U) system on unlicensed spectrum, NR (NR-based access to unlicensed spectrum) unlicensed spectrum, NR-U) system, universal mobile telecommunication system (UMTS), wireless local area network (Wireless Local Area Networks, WLAN), wireless fidelity (Wireless Fidelity, WiFi), next-generation communications (5th-Generation) , 5G) system or other communication systems, etc.
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • NR New Radio
  • D2D Device to Device
  • M2M Machine to Machine
  • MTC machine type communication
  • V2V vehicle to vehicle
  • the communication system in the embodiments of the present application can be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, can also be applied to a dual connectivity (DC) scenario, and can also be applied to a standalone (SA) deployment.
  • CA Carrier Aggregation
  • DC dual connectivity
  • SA standalone
  • the embodiment of the application does not limit the applied frequency spectrum.
  • the embodiments of this application can be applied to licensed spectrum or unlicensed spectrum.
  • the embodiments of this application describe various embodiments in combination with network equipment and terminal equipment.
  • the terminal equipment may also be referred to as User Equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station, and remote. Station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.
  • UE User Equipment
  • access terminal subscriber unit, subscriber station, mobile station, mobile station, and remote.
  • Station remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.
  • the terminal device can be a station (STAION, ST) in a WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, and personal digital processing (Personal Digital Assistant, PDA) devices, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, and next-generation communication systems, such as terminal devices in the NR network or Terminal equipment in the public land mobile network (PLMN) network that will evolve in the future.
  • STAION, ST station
  • WLAN Wireless Local Loop
  • PDA Personal Digital Assistant
  • the terminal device may also be a wearable device.
  • Wearable devices can also be called wearable smart devices. It is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes.
  • a wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a kind of hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, complete or partial functions that can be implemented without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones.
  • a network device can be a device used to communicate with mobile devices.
  • the network device can be an access point (AP) in WLAN, a base station (BTS) in GSM or CDMA, or a device in WCDMA.
  • a base station (NodeB, NB) can also be an Evolutional Node B (eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and a network device (gNB) in the NR network Or network equipment in the PLMN network that will evolve in the future.
  • AP access point
  • BTS base station
  • gNB network device
  • the network equipment provides services for the cell
  • the terminal equipment communicates with the network equipment through the transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell
  • the cell may be a network equipment (for example, The cell corresponding to the base station.
  • the cell can belong to a macro base station or a base station corresponding to a small cell.
  • the small cell here can include: Metro cell, Micro cell, Pico Cells, Femto cells, etc. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-rate data transmission services.
  • Figure 1 exemplarily shows one network device 110 and two terminal devices 120.
  • the wireless communication system 100 may include multiple network devices 110, and the coverage of each network device 110 may include other numbers.
  • the terminal device 120 is not limited in this embodiment of the application.
  • the wireless communication system 100 may also include other network entities such as a mobility management entity (Mobility Management Entity, MME), access and mobility management function (Access and Mobility Management Function, AMF). This is not limited.
  • MME Mobility Management Entity
  • AMF Access and Mobility Management Function
  • 5G 5rd Generation, fifth generation IIoT (Industrial Internet of Things, Industrial Internet) needs to support industrial automation (Factory automation), transmission automation (Transport Industry), intelligent power distribution (Electrical Power Distribution) and other businesses in the 5G system spread.
  • IIoT introduces TSN (Time Sensitive Network) or TSC (Time Sensitive Communication).
  • TSN Time Sensitive Network
  • TSC Time Sensitive Communication
  • the 5G network will serve as a TSN bridge to provide services for the TSN network and services.
  • the NR system needs to provide lower delay guarantees and higher clock synchronization accuracy. In this way, when the industrial automation business spreads in the 5G network, the operation and connection of each point of the mechanical operation are accurate and meet the time requirements.
  • TSN service when TSN service is propagated in 5G, it needs to meet the time synchronization accuracy requirement of 1 us.
  • time accuracy of 1 us is related to the time synchronization accuracy (accuracy) notified by the network and the time synchronization accuracy error (delta) on the UE side.
  • the synchronization error on the UE side is determined by RAN1 (Radio Access Network), and its error is related to many factors, such as propagation loss and equipment limitations.
  • TimeReferenceInfo Time Reference Information
  • Information Element Information Element
  • propagation delay compensation is required to make the time synchronization accuracy error of the physical layer within the required range, so as to ultimately ensure the TSN service Meet the 1us (microsecond) time synchronization accuracy requirement when propagating in 5G.
  • TA information can be used to compensate for propagation delay.
  • the propagation delay compensation can be performed by a terminal device such as a UE.
  • the UE determines the compensated propagation delay according to the value of the TA information.
  • the compensation value is 0.5TA or 0.5Nta.
  • TA timing advance
  • TA information is usually used to compensate for propagation delay.
  • the UE has different ways to obtain TA information in the unconnected state and the connected state.
  • the UE When the UE is in idle or inactive state, it does not maintain time synchronization with the network side. Therefore, the UE needs to go through the RA (Random Access) process to obtain the TA during the initial access process.
  • Information perform synchronization calibration.
  • the UE In the connected state (connected), the UE obtains TA information according to the TAC (TA command) sent by the network, and performs synchronization calibration.
  • TAC TA command
  • the conditions that trigger the RA process include:
  • RRC Connection Re-establishment procedure RRC connection re-establishment procedure
  • the uplink frame propagation advance is (N TA + N TA offset ) ⁇ T c .
  • N TA is related to the indicated TA command carried in TAC or RAR (Random Access Response, Random Access Response). What is given in TAC is the index of timing advance adjustment.
  • N TA T A ⁇ 16 ⁇ 64/2 ⁇
  • T A TA command, and its value is: 0,1,2,...,3846.
  • RAR format can be seen in Figure 3, where TAcommand occupies 12 bits (bits).
  • the main random access methods supported include: random access methods based on contention and random access methods based on non-competition.
  • the four-step random access process of NR is shown in Figure 4 and Figure 5.
  • the contention-based random access process shown in FIG. 4 includes 4 steps, and the non-contention-based random access process shown in FIG. 5 is divided into 2 steps.
  • the specific steps of the random access process are as follows:
  • Step 1 The terminal device, such as the UE, sends Msg1 (Message1, message 1) to the network device, such as gNB.
  • Msg1 Message1, message 1
  • the terminal selects PRACH (Physical Random Access Channel) resources, and sends the selected preamble on the selected PRACH. If it is based on non-contention random access, the PRACH resource and preamble can be specified by the base station. Based on the preamble, the base station can estimate the uplink Timing (timing) and the grant (authorization) size required for the terminal to propagate Msg3 (Message3, Message 3).
  • PRACH Physical Random Access Channel
  • Step 2 The network device sends RAR (Msg2) to the terminal device.
  • the terminal device After the terminal device sends Msg1, it opens a random access response time window (ra-ResponseWindow), and monitors the PDCCH (Physical) scrambled by RA (Random Access)-RNTI (Radio Network Temporary Identifier) in this window. Downlink Control Channel, physical downlink control channel).
  • RA-RNTI is related to the PRACH time-frequency resources used by the UE to send Msg1.
  • the terminal device After successfully receiving the PDCCH scrambled by the RA-RNTI, the terminal device can obtain the PDSCH (Physical Downlink Shared Channel) scheduled by the PDCCH.
  • the PDSCH contains RAR (Random Access Response).
  • RAR may specifically include the following information:
  • the subheader of RAR contains BI (Backoff Indicator), which is used to indicate the backoff time for retransmission of Msg1;
  • RAPID Random Access Preamble Identifier
  • the payload of RAR includes TAG (Timing Advance Group), which is used to adjust the uplink timing;
  • UL grant uplink scheduling grant: uplink resource indication for scheduling Msg3;
  • Temporary C-RNTI used to scramble the PDCCH of Msg4 (in the case of initial access).
  • the terminal device If the terminal device receives the PDCCH scrambled by the RAR-RNTI, and the RAR includes the preamble index sent by itself, the terminal device considers that it has successfully received the random access response.
  • Step 3 The terminal equipment propagates Msg3 on the network equipment scheduling resource.
  • Msg3 is mainly used to inform the network equipment of what event triggered the RACH (Random Access Channel) process. For example, if it is an initial access random process, Msg3 will carry the UE identification and establishment cause; if it is RRC (Radio Resource Control) reestablishment, it will carry the connected UE identification and establishment cause .
  • RRC Radio Resource Control
  • Step 4 The network device sends Msg4 to the terminal device.
  • Msg4 has two functions, one is for contention conflict resolution; the other is for network equipment to propagate RRC configuration messages to terminal equipment. There are the following ways to resolve the contention conflict: one is if the UE carries the C-RNTI in the Msg3, the Msg4 uses the C-RNTI scrambled PDCCH scheduling. The other is that if the UE does not carry C-RNTI in Msg3, such as initial access, Msg4 uses TC-RNTI scrambled PDCCH scheduling.
  • the conflict resolution method is that the UE receives the PDSCH of Msg4 and matches the CCCH in the PDSCH. (Common Control Channel, common control channel) SDU (Service Data Unit, business data unit).
  • the network device can know the time when the terminal device sends the preamble according to the RACH (Random Access) time-frequency resource used to receive the preamble from the terminal device, so as to determine the terminal according to the sending time and receiving time of the preamble.
  • RACH Random Access
  • the MsgA (messageA, message A) in the two-step random access includes the preamble propagated on the PRACH and the load information propagated on the PUSCH (Physical Uplink Shared Channel).
  • the terminal device monitors the response from the network side in the configured window. If an indication that the contention conflict resolution is successful issued by the network device is received, the terminal device ends the random access process.
  • the embodiments of the present application can enable a non-connected state such as idle/inactive UE to obtain valid TA information, compensate for propagation delay, and perform time synchronization to ensure that 5GS meets the requirements of time synchronization accuracy required by the TSN network.
  • the embodiment of the present application can enable the connected UE to obtain effective TA information, compensate for propagation delay, and perform time synchronization.
  • FIG. 7 is a schematic flowchart of a time synchronization method 200 according to an embodiment of the present application. This method can optionally be applied to the system shown in FIG. 1, but is not limited to this. The method includes at least part of the following content.
  • the terminal device obtains the timing advance TA information through a random access process.
  • the terminal device uses the TA information to perform time synchronization. Specifically, the terminal device can use the TA information to compensate for the propagation delay for time synchronization.
  • the random access process is a two-step random access (2-step RACH) process or a four-step random access (4-step RACH) process.
  • the TA information is carried by at least one of the following messages: MsgB in a two-step random access procedure; Msg2 in a four-step random access procedure.
  • the network device can send MsgB carrying TA information to the terminal device.
  • the network device can send Msg2 carrying TA information to the terminal device.
  • the terminal device acquires time calibration TA information through a random access process, including: in a case where it is determined that the terminal device is at least one of the following, the terminal device triggers a random access process to acquire TA information:
  • Case 1 The terminal device needs to obtain valid TA information. For example, if it is detected that the UE does not have valid TA information, the UE needs to obtain valid TA information.
  • Case 2 The terminal device does not have valid TA information.
  • Case 3 Terminal equipment needs to compensate for propagation delay.
  • the UE may determine whether to perform propagation delay compensation according to instructions from the network device, pre-configuration, or its own conditions.
  • the terminal equipment needs to be time synchronized.
  • UEs that support high-precision synchronization requirements need to perform time synchronization.
  • Another example is that the UE needs to perform time synchronization in the TSC service scenario.
  • the terminal device triggers the random access process also includes: the terminal device has no data to be transmitted.
  • the terminal device needs to obtain valid TA information, there is no valid TA information, propagation delay compensation or time synchronization is required, and the terminal device has no data to transmit, the terminal device can actively trigger the four-step or two-step random access process, The TA information is obtained through the random access process. Furthermore, the TA information is used for propagation delay compensation to achieve time synchronization with the network device.
  • the method further includes: the terminal device determines whether to perform propagation delay compensation according to an instruction of the network device, pre-configuration, or its own situation. If the transmission delay compensation is performed, the random access procedure can be triggered by referring to the third case above.
  • the terminal device can directly trigger a random access procedure to obtain TA information.
  • the terminal device may also trigger a random access procedure to obtain TA information when it is determined to compensate for the propagation delay.
  • the manner in which the terminal device determines whether to perform propagation delay compensation according to an instruction of the network device includes at least one of the following:
  • the manner in which the terminal device determines whether to perform propagation delay compensation according to a pre-configuration includes: determining whether to perform propagation delay compensation according to a set parameter.
  • the manner in which the terminal device determines whether to perform propagation delay compensation according to its own situation includes: determining whether to perform propagation delay compensation according to the device capability.
  • the terminal device can also try to compensate for the propagation delay when its own time accuracy is insufficient.
  • the terminal device determines to compensate for the propagation delay. If the system information or the dedicated RRC does not include indication information for the terminal device to compensate for the propagation delay, the terminal device determines not to compensate for the propagation delay. If the system information or the dedicated RRC includes indication information that the terminal device does not perform propagation delay compensation, the terminal device determines not to perform propagation delay compensation. If the system information or the dedicated RRC includes indication information for the terminal device to compensate for the propagation delay, the terminal device determines to compensate for the propagation delay. If the system information or the dedicated RRC includes indication information that the terminal device does not perform propagation delay compensation, the terminal device determines to perform propagation delay compensation.
  • the network device does not instruct the terminal device to compensate for the propagation delay, and the terminal device can also compensate for the propagation delay.
  • the above-mentioned setting parameters may include, but are not limited to: distance, path loss, or RSRP (Reference Signal Received Power).
  • the indication information of the propagation delay of the terminal equipment is determined.
  • the path loss between the terminal device and the network device reaches a certain threshold, determine the indication information of the propagation delay of the terminal device.
  • the terminal device determines the indication information of the propagation delay.
  • the terminal device determines the indication information of the propagation delay of the terminal device.
  • the method further includes: in the case where the terminal device determines to perform propagation delay compensation, determining whether it has valid TA information.
  • the terminal device can determine whether the terminal device has valid TA information after determining to compensate for the propagation delay. Then, in the case that the terminal device does not have valid TA information, a random access procedure is triggered to obtain TA information.
  • the method further includes: in the case where it is determined that the terminal device performs propagation delay compensation and the terminal device has valid TA information, the terminal device performs propagation delay compensation and performs time synchronization.
  • the method further includes: the terminal device sending first information, the first information is used to indicate a trigger reason for the random access procedure, and the trigger reason includes at least one of the following:
  • the terminal device needs to obtain valid TA information
  • the terminal device does not have valid TA information
  • the terminal equipment needs to be compensated for propagation delay
  • the terminal equipment needs time synchronization.
  • the trigger reason also includes that the terminal device has no data to be transmitted.
  • the above trigger causes can be represented by the same cause value, or can be represented by different cause values.
  • the first information is carried by at least one of the following messages: MsgA for a two-step random access procedure; Msg3 for a four-step random access procedure.
  • the network device can send the MsgA carrying the first information to the terminal device.
  • the network device can send Msg3 carrying the first information to the terminal device. After receiving the first information, the terminal device can obtain the reason why the terminal device triggers the random access process.
  • the first information is carried in the MsgA or Msg3 through at least one of the following: specific information (such as a specific MAC CE); RRC establishment request; RRC re-establishment request; RRC recovery request.
  • specific information such as a specific MAC CE
  • RRC establishment request such as a specific MAC CE
  • RRC re-establishment request such as a specific MAC CE
  • the cause value in the RRC establishment request of MsgA or Msg3 can be set to any one of the aforementioned trigger causes.
  • the reason value in the RRC establishment request received by the network device is one of the aforementioned trigger reasons, and may send at least one of an RRC establishment message, an RRC release message, or an RRC rejection message to the terminal device.
  • the cause value in the RRC re-establishment request of MsgA or Msg3 can be set to any one of the aforementioned trigger causes.
  • the reason value in the RRC re-establishment request received by the network device is one of the aforementioned trigger reasons, and may send at least one of an RRC re-establishment message, an RRC release message, or an RRC rejection message to the terminal device.
  • the cause value in the RRC recovery request of MsgA or Msg3 can be set to any one of the aforementioned trigger causes.
  • the reason value in the RRC recovery request received by the network device is one of the aforementioned trigger reasons, and may send at least one of an RRC recovery message, an RRC establishment message, an RRC release message, or an RRC rejection message to the terminal device.
  • the method further includes: the terminal device is in a connected state after receiving the RRC establishment message or the RRC re-establishment message, and uses the TA information to compensate for the propagation delay.
  • the terminal device in the non-connected state, enters the connected state from the non-connected state after receiving the RRC establishment message or the RRC re-establishment message sent by the network device, and uses the TA information to compensate for the propagation delay.
  • the terminal device triggers a random access process, maintains the connected state, and uses the TA information to compensate for the propagation delay.
  • the method further includes: the terminal device is in a disconnected state after receiving the RRC release message, the RRC recovery message, or the RRC reject message, and uses the TA information to compensate for the propagation delay.
  • the terminal device in the non-connected state, does not enter the connected state after receiving the RRC release message, the RRC recovery message or the RRC reject message sent by the network device, and uses the TA information to compensate for the propagation delay.
  • the terminal device when the terminal device is in the connected state, after receiving the RRC release message, the RRC recovery message or the RRC reject message sent by the network device, it leaves the connected state and uses the TA information to compensate for the propagation delay.
  • the random access process is triggered by the terminal device, which can ensure that the terminal device can obtain valid TA information in various scenarios (for example, connected state and non-connected state), compensate for propagation delay, and perform time synchronization.
  • this embodiment provides a method for a non-connected UE to obtain TA information.
  • the network device can determine whether to make the UE enter the connected state according to related information. For example, it is determined whether to send an establishment or re-establishment message, or to send a release (release) message, resume (resume) message, reject (reject) message, and so on. This can ensure that the UE obtains valid TA information, compensates for propagation delay, and synchronizes with the system.
  • unnecessary state transitions of the UE can be avoided, and the complexity of the UE can be reduced.
  • This embodiment may be applicable to a UE in a non-connected state, such as a UE in one of the RRC idle state and the RRC inactive state.
  • This embodiment can be extended to a connected UE.
  • the UE obtains valid TA information through a random access process. Then the UE uses all valid TA information to compensate the propagation delay for time synchronization.
  • the random access process may include a two-step random access process and/or a four-step random access process.
  • the first information can be carried in Msg3 (four-step random access procedure) or MsgA (two-step random access procedure) to indicate that the reason for triggering the random access procedure is: the UE needs to obtain valid TA information, and the UE does not At least one of valid TA information, propagation delay compensation for the UE, or time synchronization for the UE.
  • the first information may be carried in RRCSetupRequest, RRCReestablishmentRequest, or RRCReestablishmentRequest in Msg3 or MsgA.
  • the first information may indicate a new establishment cause (cause), a re-establishment cause (cause), or a recovery cause (cause).
  • the base station such as the gNB, determines the reason why the UE triggers the random access procedure according to the first information.
  • the gNB sends an RRCRelease or RRCResume message to the UE.
  • the specific implementation process of this embodiment includes:
  • the UE determines whether to perform propagation delay compensation according to the instructions of the network equipment, pre-configuration or its own conditions.
  • the UE may be based on system information or indication information in dedicated (dedicated) RRC, such as the indication information of the UE’s propagation delay/non-propagation delay indicated by the network, or the parameters of the UE's propagation/non-propagation delay indicated by the network (Such as threshold, road loss, etc.).
  • RRC dedicated (dedicated) RRC
  • the UE performs propagation delay compensation and time synchronization according to the valid TA information.
  • the UE triggers a RACH process (2-step RACH or 4-step RACH) to obtain valid TA information for propagation delay compensation and time synchronization.
  • a RACH process (2-step RACH or 4-step RACH) to obtain valid TA information for propagation delay compensation and time synchronization.
  • the first information carried in Msg3 or MsgA is used to indicate that the reason for triggering the random access process is: the UE needs to obtain valid TA information, the UE does not have valid TA information, the UE needs to compensate for the propagation delay, or the UE needs to perform time synchronization. At least one.
  • the first information is characterized as a random access (RACH) triggering cause (cause).
  • the trigger reason may include at least one of the following: the UE needs to obtain valid TA information, the UE does not have valid TA information, the UE needs to compensate for propagation delay, or the UE needs to perform time synchronization.
  • the UE is a non-connected UE, and the UE does not have valid TA information at this time, the UE triggers the RACH process (2-step RACH or 4-step RACH) to obtain valid TA information to compensate for propagation delay and time Synchronize.
  • the first information carried in Msg3 or MsgA is used to indicate the reason for triggering the random access process: the UE needs to obtain valid TA information, the UE does not have valid TA information, the UE needs to compensate for the propagation delay, and the UE needs to perform time synchronization. At least one.
  • the first information can be carried in specific information (such as a specific MAC CE).
  • the first information may also be carried in at least one of RRCSetupRequest (RRC establishment request), RRCReestablishmentRequest (RRC reestablishment request), and RRCResume (RRC restoration request).
  • RRCSetupRequest RRC establishment request
  • RRCReestablishmentRequest RRC reestablishment request
  • RRCResume RRC restoration request
  • the first information may be characterized as a new establishment cause (cause), a re-establishment cause (cause), or a recovery cause (cause).
  • the new establishment cause (establishmentCause), reestablishment cause (reestablishmentCause), or recovery cause (cause) may include: the UE needs to obtain valid TA information, the UE does not have valid TA information, the UE needs to perform propagation delay compensation, or the UE needs to perform At least one of time synchronization.
  • the base station determines that the UE needs to obtain TA information, does not have valid TA information, needs time synchronization, or needs propagation delay compensation.
  • the base station can perform the following steps:
  • the base station process Msg2 (four-step random access process) or MsgB (two-step random access process) to indicate the valid TA information to the UE.
  • the base station sends one of the RRC establishment message, the RRC re-establishment message, the RRC release message, the RRC recovery message or the RRC rejection message to the UE.
  • the base station determines that the UE currently needs to perform time synchronization, only to obtain TA information, for propagation delay compensation, or if there is no data to be transmitted according to the first information, the base station sends an RRCRelease message, RRCresume (RRC resume) message or RRCreject (RRC reject) message to the UE.
  • the UE does not enter the connected state, and only uses the TA information to compensate for the propagation delay and perform time synchronization.
  • the base station sends an RRC establishment or RRC re-establishment message to the UE.
  • the UE enters the connected state and uses the TA information to compensate for the propagation delay.
  • the base station determines that the UE currently needs time synchronization, only to obtain TA information, for propagation delay compensation, or no data to be transmitted based on the first information, then the base station sends an RRCelease message, RRCResume (RRC Recover) message or RRCReject (RRC Reject) message to the UE.
  • the UE leaves the connected state and only uses the TA information to compensate for the propagation delay and perform time synchronization.
  • the base station can send an RRC establishment or RRC re-establishment message to the UE.
  • the UE obtains the TA information according to step 3, and compensates for the propagation delay according to the trigger cause for time synchronization.
  • the time synchronization method in the embodiment of the present application may include the following steps:
  • Step 1 The UE sends Msg1 to the base station.
  • Step 2 The base station sends RAR (Msg2) to the UE.
  • Msg2 includes valid TA information.
  • Step 3 The UE sends Msg3 on the base station scheduling resource.
  • the Msg3 carries first information to indicate the reason for triggering the random access process. At least one of the following: the UE needs to obtain valid TA information, the UE does not have valid TA information, and the UE needs For propagation delay compensation, the UE needs to perform time synchronization.
  • specific information such as a specific MAC CE
  • Step 4 The base station sends Msg4 to the UE.
  • the base station determines the reason for triggering the random access procedure according to the status of the UE and the first information, and sends a corresponding message to the UE.
  • This message is carried in Msg4.
  • the UE uses the received TA information to compensate for the propagation delay for time synchronization.
  • the base station determines that the UE currently needs time synchronization, propagation delay compensation, only needs to obtain TA information, or no data to be transmitted based on the first information
  • the base station sends an RRCelease message, RRCResume (RRC Recover) message or RRCReject (RRC Reject) message to the UE.
  • the UE obtains TA information and performs propagation delay compensation for time synchronization.
  • the UE does not enter the connected state, and only uses the TA information to compensate for the propagation delay for time synchronization.
  • the base station sends an RRC establishment or RRC re-establishment message to the UE.
  • the UE enters the connected state and uses the TA information to compensate for the propagation delay for time synchronization.
  • the base station determines that the UE currently needs time synchronization, only to obtain TA information, for propagation delay compensation, or no data to be transmitted according to the first information, then the base station sends an RRCRelease message, an RRCResume message, or an RRCReject message To the UE.
  • the UE leaves the connected state and only uses the TA information to compensate for the propagation delay for time synchronization.
  • the UE If the UE is a connected UE and the RACH is triggered, the UE is in the connected state and uses TA information to compensate for propagation delay.
  • the base station sends an RRC establishment or RRC re-establishment message to the UE.
  • the time synchronization method in the embodiment of the present application may include the following steps:
  • Step A The UE sends MsgA (message A) to the base station, and the first information is carried in the MsgA to indicate that the reason for triggering the random access procedure is at least one of the following: the UE needs to obtain valid TA information, the UE does not have valid TA information, The UE needs to compensate for the propagation delay, and the UE needs to perform time synchronization.
  • specific information such as a specific MAC CE
  • Step B The UE monitors the response MsgB (messageB, message B) of the base station in the configured window.
  • MsgB includes valid TA information.
  • the base station determines the reason for triggering the random access procedure according to the status of the UE and the first information, and sends a corresponding message to the UE.
  • This message is carried in the MsgB message sent by the base station to the UE.
  • the UE uses the received TA information to compensate for the propagation delay for time synchronization.
  • the base station If the UE is an inactive/idle UE, and the base station determines that the UE currently needs time synchronization, only to obtain TA, for propagation delay compensation, or no data to be transmitted based on the first information, the base station sends an RRCelease message, RRCresume message or RRCreject Message to UE.
  • the UE obtains TA information and performs propagation delay compensation for time synchronization.
  • the UE does not enter the connected state, and only uses the TA information to compensate for the propagation delay for time synchronization.
  • the base station sends an RRC establishment or RRC re-establishment message to the UE.
  • the UE enters the connected state and uses the TA to compensate for the propagation delay for time synchronization.
  • the base station determines that the UE currently needs time synchronization, only to obtain TA, to compensate for propagation delay, or no data to be transmitted according to the first information, the base station sends an RRCRelease message, an RRCResume message, or an RRCReject message to UE.
  • the UE leaves the connected state and only uses the TA information to compensate for the propagation delay for time synchronization.
  • the UE If the UE is a connected UE and the RACH is triggered, the UE is in the connected state and uses TA information to compensate for propagation delay.
  • the base station sends an RRC establishment or RRC re-establishment message to the UE.
  • the embodiment of the present application provides a method for obtaining TA information. By triggering a random access process, it is ensured that the UE can obtain valid TA information in various scenarios (such as connected state and non-connected state). Delay compensation, synchronized with the system time. In addition, unnecessary state transitions of the UE can be avoided, and the complexity of the UE can be reduced.
  • FIG. 8 is a schematic flowchart of a time synchronization method 300 according to an embodiment of the present application. This method can optionally be applied to the system shown in FIG. 1, but is not limited to this. The method includes at least part of the following content.
  • the network device sends the timing advance TA information through the random access process, where the TA information is used to instruct the terminal device to perform time synchronization.
  • the TA information may be used to instruct the terminal device to compensate for propagation delay for time synchronization.
  • the random access process is a two-step random access process or a four-step random access process.
  • the network device sends TA information through a random access process, including:
  • the network device sends the TA information through the random access process:
  • Terminal equipment needs to obtain valid TA information
  • the terminal device does not have valid TA information
  • Terminal equipment needs to compensate for propagation delay
  • the terminal equipment needs time synchronization.
  • determining that the terminal device triggers the random access procedure further includes: the terminal device has no data to be transmitted.
  • the TA information is carried by at least one of the following messages: MsgB in a two-step random access procedure; Msg2 in a four-step random access procedure.
  • the method further includes: the network device receives first information, where the first information is used to indicate a reason for triggering a random access procedure, and the reason for triggering includes at least one of the following:
  • Terminal equipment needs to obtain valid TA information
  • the terminal device does not have valid TA information
  • the terminal equipment needs time synchronization.
  • the triggering cause of the aforementioned random access procedure also includes that the terminal device has no data to be transmitted.
  • the first information is carried by at least one of the following messages: MsgA for a two-step random access procedure; Msg3 for a four-step random access procedure.
  • the first information is carried in the MsgA or Msg3 through at least one of the following: specific information (such as a specific MAC CE); RRC establishment request; RRC re-establishment request; recovery request.
  • specific information such as a specific MAC CE
  • RRC establishment request such as a specific MAC CE
  • RRC re-establishment request such as a specific MAC CE
  • the method further includes: the network device determines, according to the first information, the reason why the terminal device triggers the random access process.
  • the method further includes: the network device determines which response message to send according to the first information, or determines the connection state that the terminal needs to be in.
  • the method further includes: the network device determines, according to the first information, that the terminal device does not have valid TA information, needs propagation delay compensation, needs time synchronization, or has no data transmission requirements, and sends RRC Setup message or RRC re-establishment message.
  • the network device determines the reason for the terminal device to trigger the random access process according to the first information. If one of the above triggering reasons is carried in the RRC establishment request, the network device may send at least one of an RRC establishment message, an RRC release message, or an RRC rejection message to the terminal device. If one of the above triggering reasons is carried in the RRC re-establishment request, the network device can send at least one of an RRC re-establishment message, an RRC release message, or an RRC rejection message to the terminal device.
  • the network device may send at least one of an RRC recovery message, an RRC setup message, an RRC release message, or an RRC rejection message to the terminal device.
  • the terminal device After receiving the RRC establishment message or the RRC re-establishment message sent by the network device, the terminal device enters the connected state from the non-connected state, and uses the TA information to compensate for the propagation delay.
  • the terminal device when the terminal device is in the connected state and the random access process is triggered, it can maintain the connected state and use the TA information to compensate for the propagation delay.
  • the method further includes: the network device determines, according to the first information, that the terminal device needs to perform time synchronization, only needs to obtain valid TA information, needs to perform propagation delay compensation, or there is no data to be transmitted , Send RRC release message, RRC resume message or RRC reject message.
  • the network device determines the reason for the terminal device to trigger the random access process according to the first information. If the trigger reason determines that the terminal device needs time synchronization, only needs to obtain valid TA information, needs propagation delay compensation, or has no data to be transmitted, the network device sends an RRC release message, an RRC recovery message, or an RRC rejection message. After the terminal device receives the RRC release message, the RRC recovery message or the RRC reject message sent by the network device, it does not enter the connected state and uses the TA information to compensate for the propagation delay.
  • the network device determines that the terminal device needs to perform time synchronization, only needs to acquire valid TA information, needs propagation delay compensation, or there is no data to be transmitted according to the triggering reason acquired by the first information, and sends RRC release message, RRC resume message, or RRC reject message.
  • the terminal device receives the RRC release message, the RRC recovery message or the RRC rejection message sent by the network device, it leaves the connected state and uses the TA information to compensate for the propagation delay.
  • FIG. 9 is a schematic block diagram of a terminal device 400 according to an embodiment of the present application.
  • the terminal device 400 may include:
  • the obtaining unit 410 is configured to obtain the timing advance TA information through a random access process
  • the processing unit 420 is configured to use the TA information to perform time synchronization.
  • the processing unit is further configured to use the TA information to compensate for propagation delay, so as to perform time synchronization.
  • the random access process is a two-step random access process or a four-step random access process.
  • the obtaining unit 410 is further configured to trigger a random access process to obtain TA information in a case where it is determined that the terminal device is at least one of the following:
  • the terminal device needs to obtain valid TA information
  • the terminal device does not have valid TA information
  • the terminal equipment needs to be compensated for propagation delay
  • the terminal equipment needs time synchronization.
  • determining that the terminal device triggers the random access procedure further includes: the terminal device has no data to be transmitted.
  • the TA information is carried by at least one of the following messages: MsgB in a two-step random access procedure; Msg2 in a four-step random access procedure.
  • the processing unit 420 is further configured to: when it is determined that the terminal device performs propagation delay compensation and the terminal device has valid TA information, the terminal device performs propagation delay compensation and performs Time synchronization.
  • the terminal device 400 further includes:
  • the sending unit 430 is configured to send first information, where the first information is used to indicate a reason for triggering the random access process, and the reason for triggering includes at least one of the following:
  • the terminal device needs to obtain valid TA information
  • the terminal device does not have valid TA information
  • the terminal equipment needs to be compensated for propagation delay
  • the terminal equipment needs time synchronization.
  • the trigger reason further includes: the terminal device has no data to be transmitted.
  • the first information is carried by at least one of the following messages: MsgA for a two-step random access procedure; Msg3 for a four-step random access procedure.
  • the first information is carried in the MsgA or Msg3 through at least one of the following: specific information (such as a specific MAC CE); RRC establishment request; RRC re-establishment request; RRC recovery request.
  • specific information such as a specific MAC CE
  • RRC establishment request such as a specific MAC CE
  • RRC re-establishment request such as a specific MAC CE
  • the processing unit 420 is further configured to: after the terminal device receives the RRC establishment message or the RRC reestablishment message, it is in the connected state, and uses the TA information to compensate for the propagation delay.
  • the processing unit 420 is further configured to: after the terminal device receives an RRC release message, an RRC recovery message, or an RRC reject message, it is in a disconnected state, and uses TA information for propagation delay compensate.
  • the processing unit 420 is further configured to determine whether to perform propagation delay compensation according to instructions from the network device, pre-configuration, or its own conditions.
  • the processing unit 420 determines whether to perform propagation delay compensation in a manner that includes at least one of the following:
  • the parameter includes: distance, path loss, or reference signal received power RSRP.
  • the processing unit is further configured to determine whether there is valid TA information when it is determined to perform propagation delay compensation.
  • FIG. 11 is a schematic block diagram of a network device 500 according to an embodiment of the present application.
  • the network device 500 may include:
  • the sending unit 510 is configured to send timing advance TA information through a random access process, and the TA information is used to instruct the terminal device to perform time synchronization.
  • the TA information is used to instruct the terminal device to perform propagation delay compensation for time synchronization.
  • the random access process is a two-step random access process or a four-step random access process.
  • the sending unit 510 is further configured to:
  • the network device sends TA information through a random access process:
  • the terminal device needs to obtain valid TA information
  • the terminal device does not have valid TA information
  • the terminal equipment needs to be compensated for propagation delay
  • the terminal equipment needs time synchronization.
  • determining that the terminal device triggers the random access procedure further includes: the terminal device has no data to be transmitted.
  • the TA information is carried by at least one of the following messages: MsgB in a two-step random access procedure; Msg2 in a four-step random access procedure.
  • the network device further includes:
  • the receiving unit 520 is configured to receive first information, where the first information is used to indicate a reason for triggering the random access process, and the reason for triggering includes at least one of the following:
  • the terminal device needs to obtain valid TA information
  • the terminal device does not have valid TA information
  • the terminal equipment needs to be compensated for propagation delay
  • the terminal equipment needs time synchronization.
  • the trigger reason further includes: the terminal device has no data to be transmitted.
  • the first information is carried by at least one of the following messages: MsgA for a two-step random access procedure; Msg3 for a four-step random access procedure.
  • the first information is carried in the MsgA or Msg3 through at least one of the following: specific information (such as a specific MAC CE); RRC establishment request; RRC re-establishment request; recovery request.
  • specific information such as a specific MAC CE
  • RRC establishment request such as a specific MAC CE
  • RRC re-establishment request such as a specific MAC CE
  • the network device further includes a processing unit 530, configured to determine the reason why the terminal device triggers the random access procedure according to the first information.
  • the processing unit is further configured to determine which response message to send according to the first information, or determine the connection state that the terminal needs to be in.
  • the sending unit 510 is further configured to: according to the first information, determine that the terminal device does not have valid TA information or needs propagation delay compensation, and send an RRC establishment message or an RRC re-establishment message.
  • the sending unit 510 is further configured to: according to the first information, determine that the terminal device needs to perform time synchronization, only needs to obtain valid TA information, needs to perform propagation delay compensation, or does not need to transmit. Data, send RRC release message, RRC resume message or RRC reject message.
  • FIG. 13 is a schematic structural diagram of a communication device 600 according to an embodiment of the present application.
  • the communication device 600 shown in FIG. 13 includes a processor 610, and the processor 610 can call and run a computer program from a memory to implement the method in the embodiment of the present application.
  • the communication device 600 may further include a memory 620.
  • the processor 610 may call and run a computer program from the memory 620 to implement the method in the embodiment of the present application.
  • the memory 620 may be a separate device independent of the processor 610, or may be integrated in the processor 610.
  • the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices. Specifically, it may send information or data to other devices, or receive other devices. Information or data sent by the device.
  • the transceiver 630 may include a transmitter and a receiver.
  • the transceiver 630 may further include an antenna, and the number of antennas may be one or more.
  • the communication device 600 may be a network device of an embodiment of the present application, and the communication device 600 may implement the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the communication device 600 may implement the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • details are not described herein again.
  • the communication device 600 may be a terminal device of an embodiment of the present application, and the communication device 600 may implement corresponding procedures implemented by the terminal device in each method of the embodiments of the present application. For brevity, details are not described herein again.
  • FIG. 14 is a schematic structural diagram of a chip 700 according to an embodiment of the present application.
  • the chip 700 shown in FIG. 14 includes a processor 710, and the processor 710 can call and run a computer program from the memory to implement the method in the embodiment of the present application.
  • the chip 700 may further include a memory 720.
  • the processor 710 may call and run a computer program from the memory 720 to implement the method in the embodiment of the present application.
  • the memory 720 may be a separate device independent of the processor 710, or may be integrated in the processor 710.
  • the chip 700 may further include an input interface 730.
  • the processor 710 can control the input interface 730 to communicate with other devices or chips, and specifically, can obtain information or data sent by other devices or chips.
  • the chip 700 may further include an output interface 740.
  • the processor 710 can control the output interface 740 to communicate with other devices or chips, and specifically, can output information or data to other devices or chips.
  • the chip can be applied to the network device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the chip can implement the corresponding process implemented by the network device in each method of the embodiment of the present application.
  • the chip can be applied to the terminal device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the terminal device in each method of the embodiment of the present application.
  • the chip can implement the corresponding process implemented by the terminal device in each method of the embodiment of the present application.
  • the chip mentioned in the embodiment of the present application may also be referred to as a system-level chip, a system-on-chip, a system-on-chip, or a system-on-chip, etc.
  • the aforementioned processors can be general-purpose processors, digital signal processors (digital signal processors, DSP), ready-made programmable gate arrays (field programmable gate arrays, FPGAs), application specific integrated circuits (ASICs), or Other programmable logic devices, transistor logic devices, discrete hardware components, etc.
  • DSP digital signal processors
  • FPGA field programmable gate arrays
  • ASIC application specific integrated circuits
  • the aforementioned general-purpose processor may be a microprocessor or any conventional processor.
  • the above-mentioned memory may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM).
  • the memory in the embodiment of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM) and so on.
  • static random access memory static random access memory
  • DRAM dynamic random access memory
  • SDRAM Synchronous dynamic random access memory
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • synchronous connection Dynamic random access memory switch link DRAM, SLDRAM
  • Direct Rambus RAM Direct Rambus RAM
  • FIG. 15 is a schematic block diagram of a communication system 800 according to an embodiment of the present application. As shown in FIG. 15, the communication system 800 includes a terminal device 810 and a network device 820.
  • the terminal device 810 obtains the timing advance TA information through a random access process; uses the TA information for time synchronization.
  • the network device 820 sends the timing advance TA information through the random access process, and the TA information is used to instruct the terminal device to perform time synchronization.
  • the terminal device 810 may be used to implement the corresponding function implemented by the terminal device in the foregoing method
  • the network device 820 may be used to implement the corresponding function implemented by the network device in the foregoing method.
  • I will not repeat them here.
  • 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 instruction 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 instruction may be transmitted from a website, computer, server, or data center through a cable (Such as coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) to another website site, computer, server or data center.
  • 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 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 DVD), or a semiconductor medium (for example, a solid state disk (SSD)).
  • the size of the sequence number of the above-mentioned processes does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not correspond to the embodiments of the present application.
  • the implementation process constitutes any limitation.

Abstract

本申请涉及一种时间同步方法、终端设备和网络设备。其中，该时间同步方法包括：终端设备通过随机接入过程获取定时提前TA信息；该终端设备使用该TA信息进行时间同步。通过终端设备触发随机接入过程，可以保证终端设备在各种场景下都能获取有效TA信息，进行传播时延补偿，以进行时间同步。

Description

时间同步方法、终端设备和网络设备 技术领域
本申请涉及通信领域，并且更具体地，涉及一种时间同步方法、终端设备和网络设备。
背景技术
在某些场景下，UE(User Equipment，用户设备)需要进行传播时延补偿，才能使得物理层的时间同步精度误差在需要的范围内，以最终保证TSN业务在5G内传播时满足时间同步精度需求。UE可以采用TA(timing advance，定时提前；也称为time alignment，时间校准)信息进行传播时延的补偿。UE在空闲态和连接态有不同的获取TA的方式。在连接态(connected)，UE根据网络发送的TAC(TA command，TA命令)获取TA信息，进行同步校准。
对空闲态/非激活态(idle/inactive)，UE如何进行同步校准亟待解决。
发明内容
本申请实施例提供一种时间同步方法、终端设备和网络设备，终端设备在各种场景下能获取有效TA信息，进行时间同步。
本申请实施例提供一种时间同步方法，包括：
终端设备通过随机接入过程获取定时提前TA信息；
该终端设备使用该TA信息进行时间同步。
本申请实施例提供一种时间同步方法，包括：
网络设备通过随机接入过程发送定时提前TA信息，该TA信息用于指示终端设备进行时间同步。
本申请实施例提供一种终端设备，包括处理器和存储器。该存储器用于存储计算机程序，该处理器用于调用并运行该存储器中存储的计算机程序，执行上述的时间同步方法。
本申请实施例提供一种网络设备，包括处理器和存储器。该存储器用于存储计算机程序，该处理器用于调用并运行该存储器中存储的计算机程序，执行上述的时间同步方法。
本申请实施例提供一种芯片，用于实现上述的时间同步方法。
具体地，该芯片包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有该芯片的设备执行上述的时间同步方法。
本申请实施例提供一种计算机可读存储介质，用于存储计算机程序，该计算机程序使得计算机执行上述的时间同步方法。
本申请实施例提供一种计算机程序产品，包括计算机程序指令，该计算机程序指令使得计算机执行上述的时间同步方法。
本申请实施例提供一种计算机程序，当其在计算机上运行时，使得计算机执行上述的时间同步方法。
本申请实施例提供一种通信系统，包括：
终端设备，用于执行本申请任一实施例的终端设备所执行的时间同步方法；
网络设备，用于执行本申请任一实施例的网络设备所执行的时间同步方法。
本申请实施例，通过终端设备触发随机接入过程例如随机接入过程，可以保证终端设备在各种场景下(例如连接态、非连接态)都能获取有效TA信息，进行传播时延补偿，以进行时间同步。
附图说明
图1是根据本申请实施例的应用场景的示意图。
图2是UE与网络之间的时钟同步定时关系的示意图。
图3是MAC RAR响应的示意图。
图4是四步随机接入过程中基于竞争的随机接入的示意图。
图5是四步随机接入过程中基于非竞争的随机接入的示意图。
图6是两步随机接入过程的示意图。
图7是根据本申请一实施例时间同步方法的示意性流程图。
图8是根据本申请另一实施例时间同步方法的示意性流程图。
图9是根据本申请一实施例的终端设备的示意性框图。
图10是根据本申请另一实施例的终端设备的示意性框图。
图11是根据本申请一实施例的网络设备的示意性框图。
图12是根据本申请另一实施例的网络设备的示意性框图。
图13是根据本申请实施例的通信设备示意性框图。
图14是根据本申请实施例的芯片的示意性框图。
图15是根据本申请实施例的通信系统的示意性框图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、先进的长期演进(Advanced long term evolution，LTE-A)系统、新无线(New Radio，NR)系统、NR系统的演进系统、免授权频谱上的LTE(LTE-based access to unlicensed spectrum，LTE-U)系统、免授权频谱上的NR(NR-based access to unlicensed spectrum，NR-U)系统、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、无线局域网(Wireless Local Area Networks，WLAN)、无线保真(Wireless Fidelity，WiFi)、下一代通信(5th-Generation，5G)系统或其他通信系统等。
通常来说，传统的通信系统支持的连接数有限，也易于实现，然而，随着通信技术的发展，移动通信系统将不仅支持传统的通信，还将支持例如，设备到设备(Device to Device，D2D)通信，机器到机器(Machine to Machine，M2M)通信，机器类型通信(Machine Type Communication，MTC)，以及车辆间(Vehicle to Vehicle，V2V)通信等，本申请实施例也可以应用于这些通信系统。
可选地，本申请实施例中的通信系统可以应用于载波聚合(Carrier Aggregation，CA)场景，也可以应用于双连接(Dual Connectivity，DC)场景，还可以应用于独立(Standalone，SA)布网场景。
本申请实施例对应用的频谱并不限定。例如，本申请实施例可以应用于授权频谱，也可以应用于免授权频谱。
本申请实施例结合网络设备和终端设备描述了各个实施例，其中：终端设备也可以称为用户设备(User Equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置等。终端设备可以是WLAN中的站点(STAION，ST)，可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)设备、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备以及下一代通信系统，例如，NR网络中的终端设备或者未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)网络中的终端设备等。
作为示例而非限定，在本申请实施例中，该终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如： 智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
网络设备可以是用于与移动设备通信的设备，网络设备可以是WLAN中的接入点(Access Point，AP)，GSM或CDMA中的基站(Base Transceiver Station，BTS)，也可以是WCDMA中的基站(NodeB，NB)，还可以是LTE中的演进型基站(Evolutional Node B，eNB或eNodeB)，或者中继站或接入点，或者车载设备、可穿戴设备以及NR网络中的网络设备(gNB)或者未来演进的PLMN网络中的网络设备等。
在本申请实施例中，网络设备为小区提供服务，终端设备通过该小区使用的传输资源(例如，频域资源，或者说，频谱资源)与网络设备进行通信，该小区可以是网络设备(例如基站)对应的小区，小区可以属于宏基站，也可以属于小小区(Small cell)对应的基站，这里的小小区可以包括：城市小区(Metro cell)、微小区(Micro cell)、微微小区(Pico cell)、毫微微小区(Femto cell)等，这些小小区具有覆盖范围小、发射功率低的特点，适用于提供高速率的数据传输服务。
图1示例性地示出了一个网络设备110和两个终端设备120，可选地，该无线通信系统100可以包括多个网络设备110，并且每个网络设备110的覆盖范围内可以包括其它数量的终端设备120，本申请实施例对此不做限定。
可选地，该无线通信系统100还可以包括移动性管理实体(Mobility Management Entity，MME)、接入与移动性管理功能(Access and Mobility Management Function，AMF)等其他网络实体，本申请实施例对此不作限定。
应理解，本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“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。
5G(5rd Generation，第五代)IIoT(Industrial internet of Things，工业互联网)中需要支持工业自动化(Factory automation)、传输自动化(Transport Industry)、智能电力分配(Electrical Power Distribution)等业务在5G系统的传播。基于业务的时延和可靠性的传播需求，IIoT引入了TSN(Time sensitive network，时间敏感性网络)或TSC(Time sensitive Communication，时间敏感性通信)。在TSN网络中，5G网络将作为TSN bridge(桥)为TSN网络和业务提供服务。针对这一点，NR系统需要提供更低的时延保证，和更高的时钟同步精度。这样，工业自动化业务在5G网络中传播的时候，机械操作的每一个点的操作和接续精准，且是符合时间要求的。
下面介绍TSN的时间同步精度。
基于TSN业务传播的需求，TSN业务在5G内传播时，需要满足1us的时间同步精度需求。如图2所示，是否能达到1us的时间精度，从空口看，与网络通知的时间同步精度(accuracy)和UE侧的时间同步精度误差(delta)相关。UE侧的同步误差由RAN1(Radio Access Network，无线接入网络)确定，其误差与很多因素相关，如传播损耗，设备限制等。
网络通知的时间同步信息和时间同步精度信息包含在TimeReferenceInfo(时间参考信息)IE(Information Element，信息元素)中。
根据RAN1发来的联络函，在某些场景下，例如距离大于200m的场景下，需要进行传播时延补偿，方能使得物理层的时间同步精度误差在需要的范围内，以最终保证TSN业务在5G内传播时满足1us(微秒)的时间同步精度需求。例如，可以利用TA信息进行传播时延补偿。
根据当前结论，传播时延补偿可以由终端设备例如UE执行。UE根据TA信息的值，确定补偿的传播时延。例如，补偿值为0.5TA或0.5Nta。
下面介绍获取TA(timing advance，定时提前)信息的方式。
在通信系统中，通常采用TA信息进行传播时延的补偿。UE在非连接态和连接态有不同的获取TA 信息的方式。在UE处于空闲态(idle)或非激活态(inactive)，不维护和网络侧的时间同步，因此，UE需要通过RA(Random Access，随机接入)过程，在初始接入过程中，获取TA信息，进行同步校准。而在连接态(connected)，UE根据网络发送的TAC(TA command，TA命令)获取TA信息，进行同步校准。
例如，触发RA过程的条件包括：
Initial access from RRC_IDLE(从RRC空闲态初始访问)；
RRC Connection Re-establishment procedure(RRC连接重建过程)；
Handover(移交)；
DL or UL data arrival during RRC_CONNECTED when UL synchronisation status is"non-synchronised"(当UL同步状态为“非同步”时，RRC连接态期间的DL或UL数据到达)；
Transition from RRC_INACTIVE(从RRC非激活态过渡)；
To establish time alignment at SCell addition(在SCell添加时建立时间对齐)；
Request for Other SI(see subclause 7.3)(其他SI的请求)；
Beam failure recovery(波束故障恢复).
基于TAC或RA过程，上行帧传播提前量为(N TA+N TA offset)×T c。其中，N TA与TAC或RAR(Random Access Response，随机接入响应)中携带的指示的TA command相关。TAC中给出的是定时提前量调整的索引(index)。在RAR中携带TA command的场景下，N TA＝T A·16·64/2 μ，其中，T A＝TA command，其取值为：0,1,2,...,3846。在专用的TAC MAC(Media Access Control，媒体接入控制)CE(Control Element，控制单元)指示TA command的场景下，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。
另外，T c为物理层最小时间单位，T c＝1/(Δf max·N f)。其中，Δf max＝480·10 3Hz并且N f＝4096。
示例性地，RAR格式可以参见图3，其中TA command占用12bit(位)。
在NR中，主要支持的随机接入方式包括：基于竞争的随机接入方式和基于非竞争的随机接入方式。其中，NR的四步随机接入过程如图4和图5所示。图4所示的基于竞争随机接入过程包括4步，图5所示的基于非竞争的随机接入过程分为2步。示例性地，随机接入过程具体步骤如下：
步骤1：终端设备例如UE向网络设备例如gNB发送Msg1(Message1，消息1)。
终端选择PRACH(Physical Random Access Channel，物理随机接入信道)资源，并在选择的PRACH上发送选择的preamble(前导码)。如果是基于非竞争的随机接入，PRACH资源和preamble可以由基站指定。基站基于preamble可以估计上行Timing(定时)，和终端传播Msg3(Message3，消息3)所需要的grant(授权)大小。
步骤2：网络设备发送RAR(Msg2)给终端设备。
终端设备发送Msg1之后，开启一个随机接入响应时间窗(ra-ResponseWindow)，在该window内监测RA(随机接入)-RNTI(Radio Network Temporary Identifier，无线网络临时标识)加扰的PDCCH(Physical Downlink Control Channel，物理下行控制信道)。RA-RNTI与UE发送Msg1所使用的PRACH时频资源有关。
终端设备成功接收到RA-RNTI加扰的PDCCH之后，能够获得该PDCCH调度的PDSCH(Physical Downlink Shared Channel，物理下行共享信道)。PDSCH中包含了RAR(随机接入响应)。例如，RAR中具体可以包括以下信息：
RAR的subheader(子头部)中包含BI(Backoff Indicator，回退指示)，用于指示重传Msg1的回退时间；
RAR中的RAPID(Random Access Preamble Identifier，随机前导码标识)：网络响应收到的preamble index(前导码索引)；
RAR的payload(负载)中包括TAG(Timing Advance Group，定时提前组)，用于调整上行定时；
UL grant(上行调度授权)：用于调度Msg3的上行资源指示；
Temporary(临时)C-RNTI：用于加扰Msg4的PDCCH(在初始接入的情况下)。
如果终端设备接收到RAR-RNTI加扰的PDCCH，并且RAR中包括自己发送的preamble index，则终端设备认为成功接收了随机接入响应。
如图5所示，对于基于非竞争的随机接入，终端设备成功接收Msg2后，随机接入过程结束。如图4所示，对于基于竞争的随机接入，终端设备成功接收Msg2后，UE还需要继续传播Msg3和接收Msg4。
步骤3：终端设备在网络设备调度资源上传播Msg3。
Msg3主要用于通知网络设备该RACH(随机接入信道)过程是由什么事件触发。比如，如果是初始接入随机过程，则在Msg3中会携带UE标识和establishment cause(建立原因)；如果是RRC(Radio Resource Control，无线资源控制)重建，则会携带连接态UE标识和establishment cause。
步骤4：网络设备向终端设备发送Msg4。
Msg4有两个作用，一个是用于竞争冲突解决；另一个是网络设备向终端设备传播RRC配置消息。竞争冲突解决有以下方式：一种是如果UE在Msg3中携带了C-RNTI，则Msg4用C-RNTI加扰的PDCCH调度。另一种是如果UE在Msg3中没有携带C-RNTI，比如是初始接入，则Msg4用TC-RNTI加扰的PDCCH调度，冲突的解决方式是UE接收Msg4的PDSCH，通过匹配PDSCH中的CCCH(Common Control Channel，公共控制信道)SDU(Service Data Unit，业务数据单元)。
从随机接入的过程可以看出，随机接入的主要目的是终端设备与小区取得上行同步。在随机接入过程中，网络设备根据接收来自终端设备的preamble所使用的RACH(随机接入)时频资源，可以知道终端设备发送preamble的时刻，从而根据preamble的发送时刻和接收时刻确定该终端设备的初始TA信息，并通过RAR中告知终端设备。
两步随机接入可以降低时延同时减小信令开销。如图6所示，两步随机接入中的MsgA(messageA，消息A)包括在PRACH上传播的Preamble和在PUSCH(Physical Uplink Shared Channel，物理上行共享信道)上传播的负载信息。在MsgA传播后，终端设备在配置的窗口内监听网络侧的响应。如果收到网络设备下发的竞争冲突解决成功的指示，则终端设备结束随机接入过程。
本申请实施例可以使得非连接态例如idle/inactive UE获取有效TA信息，进行传播时延的补偿，进行时间同步，以保证5GS符合TSN网络需要的时间同步精度的需求。
当然，本申请实施例可以使得连接态UE获取有效TA信息，进行传播时延的补偿，进行时间同步。
图7是根据本申请一实施例时间同步方法200的示意性流程图。该方法可选地可以应用于图1所示的系统，但并不仅限于此。该方法包括以下内容的至少部分内容。
S210、终端设备通过随机接入过程获取定时提前TA信息。
S220、终端设备使用该TA信息进行时间同步。具体地，终端设备可以使用该TA信息进行传播时延补偿，以进行时间同步。
可选地，在本申请实施例中，该随机接入过程为两步随机接入(2-step RACH)过程或四步随机接入(4-step RACH)过程。
可选地，在本申请实施例中，该TA信息由以下消息至少之一携带：两步随机接入过程的MsgB；四步随机接入过程的Msg2。
在两步随机接入过程，网络设备可以向终端设备发送携带TA信息的MsgB。在四步随机接入过程中，网络设备可以向终端设备发送携带TA信息的Msg2。
可选地，在本申请实施例中，终端设备通过随机接入过程获取时间校准TA信息，包括：在确定该 终端设备为以下至少之一的情况下，该终端设备触发随机接入过程获取TA信息：
情况一：终端设备需要获取有效TA信息。例如，检测到UE没有有效TA信息，则UE需要获取有效TA信息。
情况二：终端设备没有有效TA信息。
情况三：终端设备需要进行传播时延补偿。例如，UE可以根据网络设备指示、预配置或自身情况确定是否进行传播时延补偿。
情况四：终端设备需要进行时间同步。例如，支持高精度同步需求的UE需要进行时间同步。再如UE在TSC业务场景下需要进行时间同步。
此外，确定终端设备触发随机接入过程的情况还包括：终端设备没有需要传输的数据。
终端设备需要获取有效TA信息、没有有效TA信息、需要进行传播时延补偿或需要进行时间同步，并且，终端设备没有需要传输的数据，终端设备可以主动触发四步或两步随机接入过程，通过随机接入过程获取TA信息。进而，使用TA信息进行传播时延补偿，以实现与网络设备的时间同步。
可选地，在本申请实施例中，该方法还包括：该终端设备根据网络设备指示、预配置或自身情况确定是否进行传播时延补偿。如果进行传输时延补偿，则可以参考上述情况三来触发随机接入过程。
在一种示例中，终端设备可以直接触发随机接入过程来获取TA信息。终端设备也可以在确定进行传播时延补偿的情况下，再触发随机接入过程来获取TA信息。
可选地，在本申请实施例中，该终端设备根据网络设备指示确定是否进行传播时延补偿的方式包括以下至少之一：
根据系统信息确定是否进行传播时延补偿；
根据系统信息中的指示信息确定是否进行传播时延补偿；
根据专用RRC中的指示信息确定是否进行传播时延补偿。
可选地，在本申请实施例中，终端设备根据预配置确定是否进行传播时延补偿的方式包括：根据设定参数确定是否进行传播时延补偿。
可选地，在本申请实施例中，终端设备根据自身情况确定是否进行传播时延补偿的方式包括：根据设备能力确定是否进行传播时延补偿。此外，终端设备也可以在自身时间精度不够的情况下尝试进行传播时延补偿。
例如，如果系统信息或专用RRC中包括终端设备进行传播时延补偿的指示信息，则终端设备确定进行传播时延补偿。如果系统信息或专用RRC中不包括终端设备进行传播时延补偿的指示信息，则终端设备确定不进行传播时延补偿。如果系统信息或专用RRC中包括终端设备不进行传播时延补偿的指示信息，则终端设备确定不进行传播时延补偿。如果系统信息或专用RRC中包括终端设备进行传播时延补偿的指示信息，则终端设备确定进行传播时延补偿。如果系统信息或专用RRC中包括终端设备不进行传播时延补偿的指示信息，则终端设备确定进行传播时延补偿。
此外，网络设备没有指示终端设备进行传播时延补偿，终端设备也可以进行传播时延补偿。
可选地，在本申请实施例中，上述的设定参数可以包括但不限于：距离、路损或RSRP(Reference Signal Received Power，参考信号接收功率)。
例如，如果终端设备和网络设备之间的距离达到某个门限，确定终端设备进行传播时延的指示信息。
再如，如果终端设备和网络设备之间的路损达到某个门限，确定终端设备进行传播时延的指示信息。
再如，如果RSRP达到某个门限，则确定该终端设备进行传播时延的指示信息。
再如，如果终端设备具有进行传播时延的能力，则确定该终端设备进行传播时延的指示信息。
可选地，在本申请实施例中，该方法还包括：该终端设备在确定进行传播时延补偿的情况下，确定是否具有有效TA信息。
在一种示例中，终端设备在确定进行传播时延补偿的情况下，可以再判断终端设备是否具有有效 TA信息。然后，在终端设备没有有效TA信息的情况下，再触发随机接入过程来获取TA信息。
可选地，在本申请实施例中，该方法还包括：在确定该终端设备进行传播时延补偿且该终端设备具有有效TA信息情况下，该终端设备进行传播时延补偿，进行时间同步。
可选地，在本申请实施例中，该方法还包括：该终端设备发送第一信息，该第一信息用于指示随机接入过程的触发原因，该触发原因包括以下至少之一：
该终端设备需要获取有效TA信息；
该终端设备没有有效TA信息；
该终端设备需要进行传播时延补偿；
该终端设备需要进行时间同步。
可选地，在本申请实施例中，触发原因还包括终端设备没有需要传输的数据。
上述的触发原因可以采用相同的原因值来表示，也可以采用不同的原因值来表示。
可选地，在本申请实施例中，该第一信息由以下消息至少之一携带：两步随机接入过程的MsgA；四步随机接入过程的Msg3。
在两步随机接入过程，网络设备可以向终端设备发送携带第一信息的MsgA。在四步随机接入过程中，网络设备可以向终端设备发送携带第一信息的Msg3。终端设备收到第一信息后，可以获得终端设备触发随机接入过程的原因。
可选地，在本申请实施例中，在该MsgA或Msg3中通过以下至少之一携带该第一信息：特定信息(如特定MAC CE)；RRC建立请求；RRC重建立请求；RRC恢复请求。
例如，可以将MsgA或Msg3的RRC建立请求中的原因值设置为上述的任意一种触发原因。网络设备收到RRC建立请求中的原因值为上述触发原因之一，可以向终端设备发送RRC建立消息、RRC释放消息或RRC拒绝消息中的至少之一。
例如，可以将MsgA或Msg3的RRC重建立请求中的原因值设置为上述的任意一种触发原因。网络设备收到RRC重建立请求中的原因值为上述触发原因之一，可以向终端设备发送RRC重建立消息、RRC释放消息或RRC拒绝消息中的至少之一。
例如，可以将MsgA或Msg3的RRC恢复请求中的原因值设置为上述的任意一种触发原因。网络设备收到RRC恢复请求中的原因值为上述触发原因之一，可以向终端设备发送RRC恢复消息、RRC建立消息、RRC释放消息或RRC拒绝消息中的至少之一。
可选地，在本申请实施例中，该方法还包括：该终端设备接收到RRC建立消息或RRC重建立消息后处于连接态，并使用TA信息进行传播时延补偿。
例如，终端设备在非连接态下，接收到网络设备发送的RRC建立消息或RRC重建立消息后，从非连接态进入连接态，并使用TA信息进行传播时延补偿。
再如，终端设备在连接态下，触发随机接入过程，保持连接态，并使用TA信息进行传播时延补偿。
可选地，在本申请实施例中，该方法还包括：该终端设备接收到RRC释放消息、RRC恢复消息或RRC拒绝消息后处于非连接态，并使用TA信息进行传播时延补偿。
例如，终端设备在非连接态下，接收到网络设备发送的RRC释放消息、RRC恢复消息或RRC拒绝消息后，不进入连接态，并使用TA信息进行传播时延补偿。
再如，终端设备在连接态下，接收到网络设备发送的RRC释放消息、RRC恢复消息或RRC拒绝消息后，离开连接态，并使用TA信息进行传播时延补偿。
本申请实施例通过终端设备触发随机接入过程，可以保证终端设备在各种场景下(例如连接态、非连接态)都能获取有效TA信息，进行传播时延补偿，进行时间同步。
以下以终端设备为UE，网络设备为基站为例，介绍几个具体的实施例。
实施例一：
非连接态的UE没有有效TA信息，即使获取时间同步信息，也没有办法完成系统要求的时间同步。因此，本实施例中给出非连接态UE获取TA信息的方法。此外，为了不必要的UE状态转换(idle/inactive->connected)，例如在本身没有数据传播等需求，只是要TA信息的情况下，网络设备可以根据相关信息，确定是否使得UE进入连接态。例如，确定是发送建立或重建立消息，还是发送释放(release)消息、恢复(resume)消息、拒绝(reject)消息等。这样可以保证UE获取有效TA信息，进行传播时延补偿，与系统同步。并且，还可以避免UE不必要的状态转换，降低UE复杂度。
本实施例可以适用于处于非连接态的UE，如RRC idle状态，RRC inactive状态之一的UE。
本实施例可以扩展用于连接态UE。
在本实施例中，UE通过随机接入过程，获取有效TA信息。然后UE使用所有有效TA信息，进行传播时延补偿以进行时间同步。其中，随机接入过程可以包括两步随机接入过程和/或四步随机接入过程。例如，可以在Msg3(四步随机接入过程)或MsgA(两步随机接入过程)中携带第一信息，用于指示触发随机接入过程的原因为：UE需要获取有效TA信息、UE没有有效TA信息、UE需要进行传播时延补偿或UE需要进行时间同步中的至少之一。具体地，第一信息可以携带在Msg3或MsgA中的RRCSetupRequest、RRCReestablishmentRequest或RRCResumeRequest中。第一信息可以表示新的建立原因(cause)、重建立原因(cause)或恢复原因(cause)。基站例如gNB根据第一信息，确定UE触发随机接入过程的原因。可选的，gNB发送RRCRelease或RRCResume消息给UE。
例如，本实施例的具体实现过程包括：
1.UE根据网络设备指示、预配置或自身情况确定是否进行传播时延补偿。
具体的，UE可以根据系统信息或dedicated(专用)RRC中的指示信息，如网络指示的UE进行/不进行传播时延的指示信息，或者，网络指示的UE进行/不进行传播时延的参数(如门限，路损等)。
2.若UE确定进行传播时延补偿，则：
1)UE为连接态的UE，则：
A.若当前UE有有效TA信息，则UE根据有效TA信息，进行传播时延补偿，进行时间同步。
B.若当前UE没有有效TA信息，则UE触发RACH过程(2-step RACH或4-step RACH)，获取有效TA信息，以进行传播时延补偿，进行时间同步。具体的：
在Msg3或MsgA中携带第一信息，用于指示触发随机接入过程的原因为：UE需要获取有效TA信息、UE没有有效TA信息、UE需要进行传播时延补偿或UE需要进行时间同步中的至少之一。
具体的，第一信息表征为随机接入(RACH)触发原因(cause)。具体的，触发原因可以包括以下至少之一：UE需要获取有效TA信息、UE没有有效TA信息、UE需要进行传播时延补偿或UE需要进行时间同步。
2)UE为非连接态的UE，则此时UE没有有效TA信息，则UE触发RACH过程(2-step RACH或4-step RACH)，获取有效TA信息，以进行传播时延补偿，进行时间同步。具体的：
在Msg3或MsgA中携带第一信息，用于指示触发随机接入过程的原因为：UE需要获取有效TA信息、UE没有有效TA信息、UE需要进行传播时延补偿、UE需要进行时间同步中的至少之一。
第一信息可以携带在特定信息(如特定MAC CE)中。
第一信息也可以携带在RRCSetupRequest(RRC建立请求)、RRCReestablishmentRequest(RRC重建立请求)、RRCResume(RRC恢复请求)中的至少之一。
具体的，第一信息可以表征为新的建立原因(cause)、重建立原因(cause)或恢复原因(cause)。具体的，新的建立cause(establishmentCause)、重建立cause(reestablishmentCause)或恢复原因(cause)可以包括：UE需要获取有效TA信息、UE没有有效TA信息、UE需要进行传播时延补偿或UE需要进行时间同步中的至少之一。
3.基站根据随机接入过程，确定UE需要获取TA信息、没有有效TA信息、需要进行时间同步或 需要进行传播时延补偿。基站可以执行以下步骤：
1)基站过程Msg2(四步随机接入过程)或MsgB(两步随机接入过程)将有效TA信息指示给UE。
2)基站发送RRC建立消息、RRC重建立消息、RRC释放消息、RRC恢复消息或RRC拒绝消息之一给UE。
具体可以包括以下情况：
A.当UE为inactive/idle UE，基站根据第一信息，确定UE当前需要进行时间同步、仅为获取TA信息，为进行传播时延补偿，或者没有需要传输的数据，则基站发送RRCRelease消息、RRCresume(RRC恢复)消息或RRCreject(RRC拒绝)消息给UE。相应的，UE不进入连接态，仅使用TA信息，进行传播时延补偿，进行时间同步。或者，当UE为inactive/idle UE且触发RACH(随机接入)过程，则基站发送RRC建立或RRC重建立消息给UE。相应的，UE进入连接态，使用TA信息进行传播时延补偿。
B.当UE为connected UE，基站根据第一信息，确定UE当前需要进行时间同步、仅为获取TA信息、为进行传播时延补偿或没有需要传输的数据，则基站发送RRCRelease消息、RRCResume(RRC恢复)消息或RRCReject(RRC拒绝)消息给UE。相应的，UE离开连接态，仅使用TA信息，进行传播时延补偿，进行时间同步。或者，当UE为connected UE且触发RACH，则UE在连接态，使用TA信息进行传播时延补偿。相应的，基站可以发送RRC建立或RRC重建立消息给UE。
4.UE根据第3步获取TA信息，并根据触发原因进行传播时延补偿以进行时间同步。
实施例二
以四步随机接入过程为例，参见图4和图5及其相关解释，本申请实施例的时间同步方法可以包括以下步骤：
步骤1：UE向基站发送Msg1。
步骤2：基站发送RAR(Msg2)给UE。Msg2中包括有效TA信息。
步骤3：UE在基站调度资源上发送Msg3，在Msg3中携带第一信息，用于指示触发随机接入过程的原因以下至少之一：UE需要获取有效TA信息、UE没有有效TA信息、UE需要进行传播时延补偿、UE需要进行时间同步。在Msg3中可以通过特定信息(如特定MAC CE)，RRC建立请求、RRC重建立请求、RRC恢复请求中的至少之一的原因值，携带第一信息。
步骤4：基站向UE发送Msg4。基站根据UE的状态以及第一信息确定触发随机接入过程的原因，向UE发送相应的消息。该消息携带在Msg4中。对应的，UE使用收到的TA信息进行传播时延补偿，以进行时间同步。
如果UE为inactive/idle UE，基站根据第一信息，确定UE当前需要进行时间同步、需要进行传播时延补偿、仅需要获取TA信息或没有需要传输的数据，则基站发送RRCRelease消息、RRCResume(RRC恢复)消息或RRCReject(RRC拒绝)消息给UE。UE获取TA信息，进行传播时延补偿以进行时间同步。UE不进入连接态，仅使用TA信息，进行传播时延补偿，以进行时间同步。
如果UE为inactive/idle UE且触发RACH(随机接入)过程，则基站发送RRC建立或RRC重建立消息给UE。相应的，UE进入连接态，使用TA信息进行传播时延补偿，以进行时间同步。
如果UE为connected UE，基站根据第一信息，确定UE当前需要进行时间同步、仅为获取TA信息、为进行传播时延补偿或没有需要传输的数据，则基站发送RRCRelease消息、RRCResume消息或RRCReject消息给UE。相应的，UE离开连接态，仅使用TA信息，进行传播时延补偿以进行时间同步。
如果UE为connected UE且触发RACH，则UE在连接态，使用TA信息进行传播时延补偿。相应的，基站发送RRC建立或RRC重建立消息给UE。
实施例三
以两步随机接入过程为例，参见图6及其相关解释，本申请实施例的时间同步方法可包括以下步骤：
步骤A：UE向基站发送MsgA(消息A)，在MsgA中携带第一信息，用于指示触发随机接入过程 的原因为以下至少之一：UE需要获取有效TA信息、UE没有有效TA信息、UE需要进行传播时延补偿、UE需要进行时间同步。其中，在MsgA中可以通过特定信息(如特定MAC CE)，RRC建立请求、RRC重建立请求、RRC恢复请求中的至少之一的原因值，携带第一信息。
步骤B：UE在配置的窗口内监听基站的响应MsgB(messageB，消息B)。MsgB中包括有效TA信息。
基站根据UE的状态以及第一信息确定触发随机接入过程的原因，向UE发送相应的消息。该消息携带在基站向UE发送的MsgB消息中。相应的，UE使用收到的TA信息进行传播时延补偿，以进行时间同步。
如果UE为inactive/idle UE，基站根据第一信息，确定UE当前需要进行时间同步、仅为获取TA、为进行传播时延补偿或没有需要传输的数据，则基站发送RRCRelease消息、RRCresume消息或RRCreject消息给UE。UE获取TA信息，进行传播时延补偿以进行时间同步。UE不进入连接态，仅使用TA信息，进行传播时延补偿，以进行时间同步。
如果UE为inactive/idle UE且触发随机接入过程(RACH)，则基站发送RRC建立或RRC重建立消息给UE。相应的，UE进入连接态，使用TA进行传播时延补偿，以进行时间同步。
如果UE为connected UE，基站根据第一信息，确定UE当前需要进行时间同步、仅为获取TA、为进行传播时延补偿或没有需要传输的数据，则基站发送RRCRelease消息、RRCResume消息或RRCReject消息给UE。相应的，UE离开连接态，仅使用TA信息，进行传播时延补偿以进行时间同步。
如果UE为connected UE且触发RACH，则UE在连接态，使用TA信息进行传播时延补偿。相应的，基站发送RRC建立或RRC重建立消息给UE。
由于UE需要基于TA信息进行传播时延补偿，与基站进行时间同步。因此，本申请实施例给出一种获取TA信息的方法，通过触发随机接入过程，保证了UE在各种场景下(例如连接态、非连接态)都能获取有效TA信息，进行传播时延补偿，与系统时间同步。并且，还可以避免UE不必要的状态转换，降低UE复杂度。
图8是根据本申请一实施例时间同步方法300的示意性流程图。该方法可选地可以应用于图1所示的系统，但并不仅限于此。该方法包括以下内容的至少部分内容。
S310、网络设备通过随机接入过程发送定时提前TA信息，该TA信息用于指示终端设备进行时间同步。具体地，该TA信息可以用于指示终端设备进行传播时延补偿，以进行时间同步。
可选地，在本申请实施例中，该随机接入过程为两步随机接入过程或四步随机接入过程。
可选地，在本申请实施例中，网络设备通过随机接入过程发送TA信息，包括：
在确定终端设备为以下至少之一的情况下，网络设备通过随机接入过程发送TA信息：
终端设备需要获取有效TA信息；
终端设备没有有效TA信息；
终端设备需要进行传播时延补偿；
终端设备需要进行时间同步。
可选地，在本申请实施例中，确定终端设备触发随机接入过程的情况还包括：终端设备没有需要传输的数据。
可选地，在本申请实施例中，该TA信息由以下消息至少之一携带：两步随机接入过程的MsgB；四步随机接入过程的Msg2。
可选地，在本申请实施例中，该方法还包括：该网络设备接收第一信息，该第一信息用于指示随机接入过程的触发原因，该触发原因包括以下至少之一：
终端设备需要获取有效TA信息；
终端设备没有有效TA信息；
端设备需要进行传播时延补偿；
终端设备需要进行时间同步。
可选地，在本申请实施例中，上述的随机接入过程的触发原因还包括终端设备没有需要传输的数据。
可选地，在本申请实施例中，该第一信息由以下消息至少之一携带：两步随机接入过程的MsgA；四步随机接入过程的Msg3。
可选地，在本申请实施例中，在该MsgA或Msg3中通过以下至少之一携带该第一信息：特定信息(如特定MAC CE)；RRC建立请求；RRC重建立请求；恢复请求。
可选地，在本申请实施例中，该方法还包括：网络设备根据该第一信息确定终端设备触发随机接入过程的原因。
可选地，在本申请实施例中，该方法还包括：网络设备根据该第一信息确定发送哪种响应消息，或者确定终端需要处于的连接状态。
可选地，在本申请实施例中，该方法还包括：网络设备根据该第一信息确定终端设备没有有效TA信息、需要进行传播时延补偿、需要进行时间同步或没有数据传输需求，发送RRC建立消息或RRC重建立消息。
例如，终端设备在非连接态下，网络设备根据该第一信息确定终端设备触发随机接入过程的原因。如果在RRC建立请求中携带上述触发原因之一，网络设备可以向终端设备发送RRC建立消息、RRC释放消息或RRC拒绝消息中的至少之一。如果在RRC重建立请求中携带上述触发原因之一，网络设备可以向终端设备RRC重建立消息、RRC释放消息或RRC拒绝消息中的至少之一。如果RRC恢复请求中携带上述触发原因之一，网络设备可以向终端设备发送RRC恢复消息、RRC建立消息、RRC释放消息或RRC拒绝消息中的至少之一。终端设备接收到网络设备发送的RRC建立消息或RRC重建立消息后，从非连接态进入连接态，并使用TA信息进行传播时延补偿。
再如，终端设备在连接态下，且触发了随机接入过程，可以保持连接态，并使用TA信息进行传播时延补偿。
可选地，在本申请实施例中，该方法还包括：网络设备根据该第一信息确定终端设备需要进行时间同步、仅需要获取有效TA信息、需要进行传播时延补偿或没有需要传输的数据，发送RRC释放消息、RRC恢复消息或RRC拒绝消息。
例如，终端设备在非连接态下，网络设备根据该第一信息确定终端设备触发随机接入过程的原因。如果触发原因确定终端设备需要进行时间同步、仅需要获取有效TA信息、需要进行传播时延补偿或没有需要传输的数据，网络设备发送RRC释放消息、RRC恢复消息或RRC拒绝消息。终端设备接收到网络设备发送的RRC释放消息、RRC恢复消息或RRC拒绝消息后，不进入连接态，并使用TA信息进行传播时延补偿。
再如，终端设备在连接态下，网络设备根据该第一信息获取的触发原因确定终端设备需要进行时间同步、仅需要获取有效TA信息、需要进行传播时延补偿或没有需要传输的数据，发送RRC释放消息、RRC恢复消息或RRC拒绝消息。终端设备接收到网络设备发送的RRC释放消息、RRC恢复消息或RRC拒绝消息后，离开连接态，并使用TA信息进行传播时延补偿。
本实施例的网络设备执行方法300的具体示例可以参见上述方法200的中关于网络设备例如基站的相关描述，为了简洁，在此不再赘述。
图9是根据本申请一实施例的终端设备400的示意性框图。该终端设备400可以包括：
获取单元410，用于通过随机接入过程获取定时提前TA信息；
处理单元420，用于使用该TA信息进行时间同步。
可选地，在本申请实施例中，处理单元还用于使用该TA信息进行传播时延补偿，以进行时间同步。
可选地，在本申请实施例中，该随机接入过程为两步随机接入过程或四步随机接入过程。
可选地，在本申请实施例中，该获取单元410还用于在确定该终端设备为以下至少之一的情况下，触发随机接入过程获取TA信息：
该终端设备需要获取有效TA信息；
该终端设备没有有效TA信息；
该终端设备需要进行传播时延补偿；
该终端设备需要进行时间同步。
可选地，在本申请实施例中，确定终端设备触发随机接入过程的情况还包括：该终端设备没有需要传输的数据。
可选地，在本申请实施例中，该TA信息由以下消息至少之一携带：两步随机接入过程的MsgB；四步随机接入过程的Msg2。
可选地，在本申请实施例中，该处理单元420还用于：在确定该终端设备进行传播时延补偿且该终端设备具有有效TA信息情况下，该终端设备进行传播时延补偿，进行时间同步。
可选地，在本申请实施例中，如图10所示，该终端设备400还包括：
发送单元430，用于发送第一信息，该第一信息用于指示随机接入过程的触发原因，该触发原因包括以下至少之一：
该终端设备需要获取有效TA信息；
该终端设备没有有效TA信息；
该终端设备需要进行传播时延补偿；
该终端设备需要进行时间同步。
可选地，在本申请实施例中，该触发原因还包括：该终端设备没有需要传输的数据。
可选地，在本申请实施例中，该第一信息由以下消息至少之一携带：两步随机接入过程的MsgA；四步随机接入过程的Msg3。
可选地，在本申请实施例中，在该MsgA或Msg3中通过以下至少之一携带该第一信息：特定信息(如特定MAC CE)；RRC建立请求；RRC重建立请求；RRC恢复请求。
可选地，在本申请实施例中，该处理单元420还用于：在该终端设备接收到RRC建立消息或RRC重建立消息后处于连接态，并使用TA信息进行传播时延补偿。
可选地，在本申请实施例中，该处理单元420还用于：在该终端设备接收到RRC释放消息、RRC恢复消息或RRC拒绝消息后处于非连接态，并使用TA信息进行传播时延补偿。
可选地，在本申请实施例中，该处理单元420还用于：根据网络设备指示、预配置或自身情况确定是否进行传播时延补偿。
可选地，在本申请实施例中，该处理单元420确定是否进行传播时延补偿的方式包括以下至少之一：
根据系统信息确定是否进行传播时延补偿；
根据系统信息中的指示信息确定是否进行传播时延补偿；
根据专用RRC中的指示信息确定是否进行传播时延补偿；
根据设定参数确定是否进行传播时延补偿；
根据设备能力确定是否进行传播时延补偿。
可选地，在本申请实施例中，该参数包括：距离、路损或参考信号接收功率RSRP。
可选地，在本申请实施例中，该处理单元还用于：在确定进行传播时延补偿的情况下，确定是否具有有效TA信息。
应理解，根据本申请实施例的终端设备中的各个单元的上述和其他操作和/或功能分别为了实现图7中的方法200中的终端设备的相应流程，为了简洁，在此不再赘述。
图11是根据本申请一实施例的网络设备500的示意性框图。该网络设备500可以包括：
发送单元510，用于通过随机接入过程发送定时提前TA信息，该TA信息用于指示终端设备进行时间同步。
可选地，在本申请实施例中，该TA信息用于指示终端设备进行传播时延补偿以进行时间同步。
可选地，在本申请实施例中，该随机接入过程为两步随机接入过程或四步随机接入过程。
可选地，在本申请实施例中，发送单元510还用于：
在确定终端设备为以下至少之一的情况下，该网络设备通过随机接入过程发送TA信息：
该终端设备需要获取有效TA信息；
该终端设备没有有效TA信息；
该终端设备需要进行传播时延补偿；
该终端设备需要进行时间同步。
可选地，在本申请实施例中，确定终端设备触发随机接入过程的情况还包括：该终端设备没有需要传输的数据。
可选地，在本申请实施例中，该TA信息由以下消息至少之一携带：两步随机接入过程的MsgB；四步随机接入过程的Msg2。
可选地，在本申请实施例中，如图12所示，该网络设备还包括：
接收单元520，用于接收第一信息，该第一信息用于指示随机接入过程的触发原因，该触发原因包括以下至少之一：
该终端设备需要获取有效TA信息；
该终端设备没有有效TA信息；
该终端设备需要进行传播时延补偿；
该终端设备需要进行时间同步。
可选地，在本申请实施例中，该触发原因还包括：该终端设备没有需要传输的数据。
可选地，在本申请实施例中，该第一信息由以下消息至少之一携带：两步随机接入过程的MsgA；四步随机接入过程的Msg3。
可选地，在本申请实施例中，在该MsgA或Msg3中通过以下至少之一携带该第一信息：特定信息(如特定MAC CE)；RRC建立请求；RRC重建立请求；恢复请求。
可选地，在本申请实施例中，该网络设备还包括处理单元530，用于根据该第一信息确定终端设备触发随机接入过程的原因。
可选地，在本申请实施例中，该处理单元还用于根据该第一信息确定发送哪种响应消息，或者确定终端需要处于的连接状态。
可选地，在本申请实施例中，该发送单元510还用于：根据该第一信息确定终端设备没有有效TA信息或需要进行传播时延补偿，发送RRC建立消息或RRC重建立消息。
可选地，在本申请实施例中，该发送单元510还用于：根据该第一信息确定终端设备需要进行时间同步、仅需要获取有效TA信息、需要进行传播时延补偿或没有需要传输的数据，发送RRC释放消息、RRC恢复消息或RRC拒绝消息。
应理解，根据本申请实施例的网络设备中的各个单元的上述和其他操作和/或功能分别为了实现图8中的方法300中的网络设备的相应流程，为了简洁，在此不再赘述。
图13是根据本申请实施例的通信设备600示意性结构图。图13所示的通信设备600包括处理器610，处理器610可以从存储器中调用并运行计算机程序，以实现本申请实施例中的方法。
可选地，如图13所示，通信设备600还可以包括存储器620。其中，处理器610可以从存储器620中调用并运行计算机程序，以实现本申请实施例中的方法。
其中，存储器620可以是独立于处理器610的一个单独的器件，也可以集成在处理器610中。
可选地，如图13所示，通信设备600还可以包括收发器630，处理器610可以控制该收发器630与其他设备进行通信，具体地，可以向其他设备发送信息或数据，或接收其他设备发送的信息或数据。
其中，收发器630可以包括发射机和接收机。收发器630还可以进一步包括天线，天线的数量可以为一个或多个。
可选地，该通信设备600可为本申请实施例的网络设备，并且该通信设备600可以实现本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
可选地，该通信设备600可为本申请实施例的终端设备，并且该通信设备600可以实现本申请实施例的各个方法中由终端设备实现的相应流程，为了简洁，在此不再赘述。
图14是根据本申请实施例的芯片700的示意性结构图。图14所示的芯片700包括处理器710，处理器710可以从存储器中调用并运行计算机程序，以实现本申请实施例中的方法。
可选地，如图14所示，芯片700还可以包括存储器720。其中，处理器710可以从存储器720中调用并运行计算机程序，以实现本申请实施例中的方法。
其中，存储器720可以是独立于处理器710的一个单独的器件，也可以集成在处理器710中。
可选地，该芯片700还可以包括输入接口730。其中，处理器710可以控制该输入接口730与其他设备或芯片进行通信，具体地，可以获取其他设备或芯片发送的信息或数据。
可选地，该芯片700还可以包括输出接口740。其中，处理器710可以控制该输出接口740与其他设备或芯片进行通信，具体地，可以向其他设备或芯片输出信息或数据。
可选地，该芯片可应用于本申请实施例中的网络设备，并且该芯片可以实现本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
可选地，该芯片可应用于本申请实施例中的终端设备，并且该芯片可以实现本申请实施例的各个方法中由终端设备实现的相应流程，为了简洁，在此不再赘述。
应理解，本申请实施例提到的芯片还可以称为系统级芯片，系统芯片，芯片系统或片上系统芯片等。
上述提及的处理器可以是通用处理器、数字信号处理器(digital signal processor，DSP)、现成可编程门阵列(field programmable gate array，FPGA)、专用集成电路(application specific integrated circuit，ASIC)或者其他可编程逻辑器件、晶体管逻辑器件、分立硬件组件等。其中，上述提到的通用处理器可以是微处理器或者也可以是任何常规的处理器等。
上述提及的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)。
应理解，上述存储器为示例性但不是限制性说明，例如，本申请实施例中的存储器还可以是静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synch link DRAM，SLDRAM)以及直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)等等。也就是说，本申请实施例中的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
图15是根据本申请实施例的通信系统800的示意性框图。如图15所示，该通信系统800包括终端设备810和网络设备820。
终端设备810通过随机接入过程获取定时提前TA信息；使用该TA信息进行时间同步。网络设备820通过随机接入过程发送定时提前TA信息，该TA信息用于指示终端设备进行时间同步。
其中，该终端设备810可以用于实现上述方法中由终端设备实现的相应的功能，以及该网络设备820可以用于实现上述方法中由网络设备实现的相应的功能。为了简洁，在此不再赘述。
在上述实施例中，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。该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该计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。该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。该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，该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。该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。该可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘(Solid State Disk，SSD))等。
应理解，在本申请的各种实施例中，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。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
以上所述仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以该权利要求的保护范围为准。

Claims (71)

  1. 一种时间同步方法，包括：
    终端设备通过随机接入过程获取定时提前TA信息；
    所述终端设备使用所述TA信息进行时间同步。
  2. 根据权利要求1所述的方法，其中，所述终端设备使用所述TA信息进行时间同步，包括：
    所述终端设备使用所述TA信息进行传播时延补偿，以进行时间同步。
  3. 根据权利要求1或2所述的方法，其中，所述随机接入过程为两步随机接入过程或四步随机接入过程。
  4. 根据权利要求1至3中任一项所述的方法，其中，终端设备通过随机接入过程获取时间校准TA信息，包括：
    在确定所述终端设备为以下至少之一的情况下，所述终端设备触发随机接入过程获取TA信息：
    所述终端设备需要获取有效TA信息；
    所述终端设备没有有效TA信息；
    所述终端设备需要进行传播时延补偿；
    所述终端设备需要进行时间同步。
  5. 根据权利要求4所述的方法，其中，确定终端设备触发随机接入过程的情况还包括所述终端设备没有需要传输的数据。
  6. 根据权利要求1至5中任一项所述的方法，其中，所述TA信息由以下消息至少之一携带：
    两步随机接入过程的MsgB；
    四步随机接入过程的Msg2。
  7. 根据权利要求1至6中任一项所述的方法，其中，所述方法还包括：
    在确定所述终端设备进行传播时延补偿且所述终端设备具有有效TA信息情况下，所述终端设备进行传播时延补偿，以进行时间同步。
  8. 根据权利要求1至7中任一项所述的方法，其中，所述方法还包括：
    所述终端设备发送第一信息，所述第一信息用于指示随机接入过程的触发原因，所述触发原因包括以下至少之一：
    所述终端设备需要获取有效TA信息；
    所述终端设备没有有效TA信息；
    所述终端设备需要进行传播时延补偿；
    所述终端设备需要进行时间同步。
  9. 根据权利要求8所述的方法，其中，所述触发原因还包括所述终端设备没有需要传输的数据。
  10. 根据权利要求8或9所述的方法，其中，所述第一信息由以下消息至少之一携带：
    两步随机接入过程的MsgA；
    四步随机接入过程的Msg3。
  11. 根据权利要求10所述的方法，其中，在所述MsgA或Msg3中通过以下至少之一携带所述第一信息：
    特定信息；
    无线资源控制RRC建立请求；
    RRC重建立请求；
    RRC恢复请求。
  12. 根据权利要求8至11中任一项所述的方法，其中，所述方法还包括：
    所述终端设备接收到RRC建立消息或RRC重建立消息后处于连接态，并使用TA信息进行传播时延补偿。
  13. 根据权利要求8至11中任一项所述的方法，其中，所述方法还包括：
    所述终端设备接收到RRC释放消息、RRC恢复消息或RRC拒绝消息后处于非连接态，并使用TA信息进行传播时延补偿。
  14. 根据权利要求1至13中任一项所述的方法，其中，还包括：
    所述终端设备根据网络设备指示、预配置或自身情况确定是否进行传播时延补偿。
  15. 根据权利要求14所述的方法，其中，确定是否进行传播时延补偿的方式包括以下至少之一：
    根据系统信息确定是否进行传播时延补偿；
    根据系统信息中的指示信息确定是否进行传播时延补偿；
    根据专用RRC中的指示信息确定是否进行传播时延补偿；
    根据设定参数确定是否进行传播时延补偿；
    根据设备能力确定是否进行传播时延补偿。
  16. 根据权利要求15所述的方法，其中，所述参数包括：距离、路损或参考信号接收功率RSRP。
  17. 根据权利要求14至16中任一项所述的方法，其中，还包括：
    所述终端设备在确定进行传播时延补偿的情况下，确定是否具有有效TA信息。
  18. 一种时间同步方法，包括：
    网络设备通过随机接入过程发送定时提前TA信息，所述TA信息用于指示终端设备进行时间同步。
  19. 根据权利要求18所述的方法，其中，所述TA信息用于指示终端设备进行传播时延补偿以进行时间同步。
  20. 根据权利要求18或19所述的方法，其中，所述随机接入过程为两步随机接入过程或四步随机接入过程。
  21. 根据权利要求18至20中任一项所述的方法，其中，网络设备通过随机接入过程发送TA信息，包括：
    在确定终端设备为以下至少之一的情况下，所述网络设备通过随机接入过程发送TA信息：
    所述终端设备需要获取有效TA信息；
    所述终端设备没有有效TA信息；
    所述终端设备需要进行传播时延补偿；
    所述终端设备需要进行时间同步。
  22. 根据权利要求21所述的方法，其中，确定终端设备触发随机接入过程的情况还包括：所述终端设备没有需要传输的数据。
  23. 根据权利要求18至22中任一项所述的方法，其中，所述TA信息由以下消息至少之一携带：
    两步随机接入过程的MsgB；
    四步随机接入过程的Msg2。
  24. 根据权利要求18至23中任一项所述的方法，其中，所述方法还包括：
    所述网络设备接收第一信息，所述第一信息用于指示随机接入过程的触发原因，所述触发原因包括以下至少之一：
    所述终端设备需要获取有效TA信息；
    所述终端设备没有有效TA信息；
    所述终端设备需要进行传播时延补偿；
    所述终端设备需要进行时间同步。
  25. 根据权利要求24所述的方法，其中，所述触发原因还包括所述终端设备没有需要传输的数据。
  26. 根据权利要求24或25所述的方法，其中，所述第一信息由以下消息至少之一携带：
    两步随机接入过程的MsgA；
    四步随机接入过程的Msg3。
  27. 根据权利要求26所述的方法，其中，在所述MsgA或Msg3中通过以下至少之一携带所述第一信息：
    特定信息；
    无线资源控制RRC建立请求；
    RRC重建立请求；
    恢复请求。
  28. 根据权利要求24至27中任一项所述的方法，其中，所述方法还包括：
    网络设备根据所述第一信息确定终端设备触发随机接入过程的原因。
  29. 根据权利要求24至28中任一项所述的方法，其中，所述方法还包括：
    网络设备根据所述第一信息确定终端设备没有有效TA信息或需要进行传播时延补偿，发送RRC建立消息或RRC重建立消息。
  30. 根据权利要求24至29中任一项所述的方法，其中，所述方法还包括：
    网络设备根据所述第一信息确定终端设备需要进行时间同步、仅需要获取有效TA信息、需要进行传播时延补偿或没有需要传输的数据，发送RRC释放消息、RRC恢复消息或RRC拒绝消息。
  31. 一种终端设备，包括：
    获取单元，用于通过随机接入过程获取定时提前TA信息；
    处理单元，用于使用所述TA信息进行时间同步。
  32. 根据权利要求31所述的终端设备，其中，所述处理单元还用于使用所述TA信息进行传播时延补偿，以进行时间同步。
  33. 根据权利要求31或32所述的终端设备，其中，所述随机接入过程为两步随机接入过程或四步随机接入过程。
  34. 根据权利要求31至33中任一项所述的终端设备，其中，所述获取单元还用于在确定所述终端设备为以下至少之一的情况下，触发随机接入过程获取TA信息：
    所述终端设备需要获取有效TA信息；
    所述终端设备没有有效TA信息；
    所述终端设备需要进行传播时延补偿；
    所述终端设备需要进行时间同步。
  35. 根据权利要求34所述的终端设备，其中，所述终端设备没有需要传输的数据。
  36. 根据权利要求31至35中任一项所述的终端设备，其中，所述TA信息由以下消息至少之一携带：
    两步随机接入过程的MsgB；
    四步随机接入过程的Msg2。
  37. 根据权利要求31至36中任一项所述的终端设备，其中，所述处理单元还用于：在确定所述终端设备进行传播时延补偿且所述终端设备具有有效TA信息情况下，所述终端设备进行传播时延补偿，进行时间同步。
  38. 根据权利要求31至37中任一项所述的终端设备，其中，所述终端设备还包括：
    发送单元，用于发送第一信息，所述第一信息用于指示随机接入过程的触发原因，所述触发原因包括以下至少之一：
    所述终端设备需要获取有效TA信息；
    所述终端设备没有有效TA信息；
    所述终端设备需要进行传播时延补偿；
    所述终端设备需要进行时间同步。
  39. 根据权利要求38所述的终端设备，其中，确定终端设备触发随机接入过程的情况还包括：所述终端设备没有需要传输的数据。
  40. 根据权利要求38或39所述的终端设备，其中，所述第一信息由以下消息至少之一携带：
    两步随机接入过程的MsgA；
    四步随机接入过程的Msg3。
  41. 根据权利要求40所述的终端设备，其中，在所述MsgA或Msg3中通过以下至少之一携带所述第一信息：
    特定信息；
    无线资源控制RRC建立请求；
    RRC重建立请求；
    RRC恢复请求。
  42. 根据权利要求38至41中任一项所述的终端设备，其中，所述处理单元还用于：在所述终端设备接收到RRC建立消息或RRC重建立消息后处于连接态，并使用TA信息进行传播时延补偿。
  43. 根据权利要求38至41中任一项所述的终端设备，其中，所述处理单元还用于：在所述终端设备接收到RRC释放消息、RRC恢复消息或RRC拒绝消息后处于非连接态，并使用TA信息进行传播时延补偿。
  44. 根据权利要求31至43中任一项所述的终端设备，其中，所述处理单元还用于：根据网络设备指示、预配置或自身情况确定是否进行传播时延补偿。
  45. 根据权利要求44所述的终端设备，其中，所述处理单元确定是否进行传播时延补偿的方式包括以下至少之一：
    根据系统信息确定是否进行传播时延补偿；
    根据系统信息中的指示信息确定是否进行传播时延补偿；
    根据专用RRC中的指示信息确定是否进行传播时延补偿；
    根据设定参数确定是否进行传播时延补偿；
    根据设备能力确定是否进行传播时延补偿。
  46. 根据权利要求45所述的终端设备，其中，所述参数包括：距离、路损或参考信号接收功率RSRP。
  47. 根据权利要求44至46中任一项所述的终端设备，其中，所述处理单元还用于：在确定进行传播时延补偿的情况下，确定是否具有有效TA信息。
  48. 一种网络设备，包括：
    发送单元，用于通过随机接入过程发送定时提前TA信息，所述TA信息用于指示终端设备进行时间同步。
  49. 根据权利要求48所述的网络设备，其中，所述TA信息用于指示终端设备进行传播时延补偿以进行时间同步。
  50. 根据权利要求48或49所述的网络设备，其中，所述随机接入过程为两步随机接入过程或四步随机接入过程。
  51. 根据权利要求48至50中任一项所述的网络设备，其中，发送单元还用于：
    在确定终端设备为以下至少之一的情况下，所述网络设备通过随机接入过程发送TA信息：
    所述终端设备需要获取有效TA信息；
    所述终端设备没有有效TA信息；
    所述终端设备需要进行传播时延补偿；
    所述终端设备需要进行时间同步。
  52. 根据权利要求51所述的网络设备，其中，确定终端设备触发随机接入过程的情况还包括：所述终端设备没有需要传输的数据。
  53. 根据权利要求48至52中任一项所述的网络设备，其中，所述TA信息由以下消息至少之一携带：
    两步随机接入过程的MsgB；
    四步随机接入过程的Msg2。
  54. 根据权利要求48至53中任一项所述的网络设备，其中，所述网络设备还包括：
    接收单元，用于接收第一信息，所述第一信息用于指示随机接入过程的触发原因，所述触发原因包括以下至少之一：
    所述终端设备需要获取有效TA信息；
    所述终端设备没有有效TA信息；
    所述终端设备需要进行传播时延补偿；
    所述终端设备需要进行时间同步。
  55. 根据权利要求54所述的网络设备，其中，所述触发原因还包括所述终端设备没有需要传输的数据。
  56. 根据权利要求54或55所述的网络设备，其中，所述第一信息由以下消息至少之一携带：
    两步随机接入过程的MsgA；
    四步随机接入过程的Msg3。
  57. 根据权利要求56所述的网络设备，其中，在所述MsgA或Msg3中通过以下至少之一携带所述第一信息：
    特定信息；
    无线资源控制RRC建立请求；
    RRC重建立请求；
    恢复请求。
  58. 根据权利要求54至57中任一项所述的网络设备，其中，所述网络设备还包括处理单元，用于根据所述第一信息确定终端设备触发随机接入过程的原因。
  59. 根据权利要求54至58中任一项所述的网络设备，其中，所述发送单元还用于：
    根据所述第一信息确定终端设备没有有效TA信息或需要进行传播时延补偿，发送RRC建立消息或RRC重建立消息。
  60. 根据权利要求54至58中任一项所述的网络设备，其中，所述发送单元还用于：
    根据所述第一信息确定终端设备需要进行时间同步、仅需要获取有效TA信息、需要进行传播时延补偿或没有需要传输的数据，发送RRC释放消息、RRC恢复消息或RRC拒绝消息。
  61. 一种终端设备，包括：处理器和存储器，该存储器用于存储计算机程序，所述处理器用于调用并运行所述存储器中存储的计算机程序，执行如权利要求1至17中任一项所述的方法。
  62. 一种网络设备，包括：处理器和存储器，该存储器用于存储计算机程序，所述处理器用于调用并运行所述存储器中存储的计算机程序，执行如权利要求18至30中任一项所述的方法。
  63. 一种芯片，包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有所述芯片的设备执行如权利要求1至17中任一项所述的方法。
  64. 一种芯片，包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有所述芯片的设备执行如权利要求18至30中任一项所述的方法。
  65. 一种计算机可读存储介质，用于存储计算机程序，所述计算机程序使得计算机执行如权利要求1至17中任一项所述的方法。
  66. 一种计算机可读存储介质，用于存储计算机程序，所述计算机程序使得计算机执行如权利要求18至30中任一项所述的方法。
  67. 一种计算机程序产品，包括计算机程序指令，该计算机程序指令使得计算机执行如权利要求1至17中任一项所述的方法。
  68. 一种计算机程序产品，包括计算机程序指令，该计算机程序指令使得计算机执行如权利要求18至30中任一项所述的方法。
  69. 一种计算机程序，所述计算机程序使得计算机执行如权利要求1至17中任一项所述的方法。
  70. 一种计算机程序，所述计算机程序使得计算机执行如权利要求18至30中任一项所述的方法。
  71. 一种通信系统，包括：
    终端设备，用于执行如权利要求1至17中任一项所述的方法；
    网络设备，用于执行如权利要求18至30中任一项所述的方法。
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