WO2022027225A1 - Procédé et appareil de synchronisation de liaison montante - Google Patents

Procédé et appareil de synchronisation de liaison montante Download PDF

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Publication number
WO2022027225A1
WO2022027225A1 PCT/CN2020/106800 CN2020106800W WO2022027225A1 WO 2022027225 A1 WO2022027225 A1 WO 2022027225A1 CN 2020106800 W CN2020106800 W CN 2020106800W WO 2022027225 A1 WO2022027225 A1 WO 2022027225A1
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Prior art keywords
delay compensation
propagation delay
terminal device
compensation mode
information
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PCT/CN2020/106800
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English (en)
Chinese (zh)
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范强
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华为技术有限公司
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Priority to PCT/CN2020/106800 priority Critical patent/WO2022027225A1/fr
Publication of WO2022027225A1 publication Critical patent/WO2022027225A1/fr

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

Definitions

  • the embodiments of the present application relate to the field of wireless communications, and in particular, to methods and devices for uplink timing.
  • TSN time sensitive network
  • 5G system 5th generation system
  • TSN bridge TSN bridge
  • TSN TSN slave nodes
  • PTP Precision Time Protocol
  • IEEE Institute of Electrical and Electronics Engineers
  • GM grandmaster clock
  • the timing may be downlink timing or uplink timing.
  • the downlink timing means that the master clock of the TSN domain is located outside the user plane function (UPF) entity of the 5G system and provides timing to the TSN slave nodes connected to the UE;
  • the uplink timing means that the master clock of the TSN domain is located in the Connect to the TSN slave node of the UE, and perform timing to the TSN slave node located outside the UPF or the TSN slave node connected to other UEs.
  • UPF user plane function
  • the present application provides an uplink timing method and apparatus, so that the 5G time of the terminal equipment and the access network equipment can be kept accurately synchronized, thereby meeting the synchronization accuracy requirement between each node in the TSN domain in the TSN uplink timing scenario.
  • the present application provides a method for uplink timing, and the execution body of the method is a centralized unit DU.
  • the DU receives first information from the centralized unit CU, where the first information includes a first parameter and/or a synchronization error; the DU determines a propagation delay compensation mode of the first terminal device according to the first information.
  • the DU determines the propagation delay compensation mode of the first terminal device according to the first information, and indicates the determined propagation delay compensation mode to the first terminal device, so that the first terminal device and the receiver can communicate with each other.
  • the time of the network access equipment is kept accurately synchronized, so that the master clock in the TSN domain performs uplink timing for the TSN slave node, and the clock information obtained by the TSN slave node meets the synchronization error requirement, thereby ensuring that each node in the TSN domain in industrial application scenarios is consistent.
  • the above-mentioned first parameter indicates whether the first terminal equipment needs uplink timing
  • the above-mentioned determining the propagation delay compensation method of the first terminal equipment according to the first information specifically includes: when the first terminal equipment is When the parameter indicates that the first terminal equipment needs uplink timing, the propagation delay compensation method of the first terminal equipment is the first propagation delay compensation method; when the first parameter indicates that the first terminal equipment does not need uplink timing, the first terminal equipment The propagation delay compensation method is the second propagation delay compensation method.
  • the above-mentioned first terminal device needs uplink timing, which specifically includes: the first terminal device is connected to a first master clock, and the first master clock is a TSN slave connected to the second terminal device.
  • the node performs uplink timing; or, the second terminal device is connected to a second master clock, and the second master clock performs uplink timing for the TSN slave node connected to the first terminal device.
  • the first master clock and the second master clock may be TSN master clocks.
  • the above-mentioned first parameter is used to activate or deactivate the first propagation delay compensation method
  • the above-mentioned determining the propagation delay compensation method of the first terminal device according to the first information specifically includes: : When the first parameter activates the first propagation delay compensation mode, the propagation delay compensation mode of the first terminal device is the first propagation delay compensation mode; when the first parameter deactivates the first propagation delay compensation mode, the first propagation delay compensation mode is The propagation delay compensation mode of a terminal device is the second propagation delay compensation mode, or the propagation delay compensation of the first terminal device is stopped.
  • the access network device can deactivate the first propagation delay compensation mode of the first terminal device when the first terminal device does not need to transmit the data of the TSN service, so that the first terminal device does not need TSN service when the first terminal device does not need it. , it is not necessary to use the first propagation delay compensation mode to perform propagation delay compensation, thereby saving signaling overhead and reducing the complexity of the device.
  • the above-mentioned determining the propagation delay compensation method of the first terminal device according to the first information specifically includes: when the synchronization error is less than the first threshold value, the first terminal device's The propagation delay compensation method is the first propagation delay compensation method; when the synchronization error is greater than or equal to the first threshold value, the propagation delay compensation method of the first terminal equipment is the second propagation delay compensation method, wherein the first A threshold value is preconfigured.
  • the accuracy of the above-mentioned first propagation delay compensation method is higher than that of the second propagation delay compensation method.
  • the above-mentioned first propagation delay compensation method is to perform propagation delay compensation according to a first delay compensation value
  • the second propagation delay compensation method is to perform propagation according to a timing advance TA Delay compensation.
  • the DU sends first indication information to the first terminal device, where the first indication information indicates a propagation delay compensation mode of the first terminal device.
  • the foregoing first indication information further includes TA or a first delay compensation value.
  • the DU sends second indication information to the CU, where the second indication information indicates a propagation delay compensation method of the first terminal device.
  • the DU sends first indication information to the first terminal device, where the first indication information includes a TA or a first delay compensation value.
  • the foregoing first indication information further includes a unit of the first delay compensation value.
  • the present application provides a method for uplink timing, and the execution body of the method is a CU.
  • the CU receives second information from the core network device, where the second information includes the first parameter and/or the synchronization error; the CU sends the first information to the DU according to the second information.
  • the DU determines the propagation delay compensation mode of the first terminal device according to the first information, and indicates the determined propagation delay compensation mode to the first terminal device, so that the first terminal device and the receiver can communicate with each other.
  • the time of the network access equipment is kept accurately synchronized, so that the master clock in the TSN domain performs uplink timing for the TSN slave node, and the clock information obtained by the TSN slave node meets the synchronization error requirement, thereby ensuring that each node in the TSN domain in industrial application scenarios is consistent.
  • the above-mentioned first parameter indicates whether the first terminal equipment needs uplink timing, which specifically includes: when the first parameter indicates that the first terminal equipment needs uplink timing, the broadcast of the first terminal equipment
  • the delay compensation method is the first propagation delay compensation method; when the first parameter indicates that the first terminal equipment does not need uplink timing, the propagation delay compensation method of the first terminal equipment is the second propagation delay compensation method.
  • the above-mentioned first terminal device needs uplink timing, which specifically includes: the first terminal device is connected to a first master clock, and the first master clock is a TSN slave connected to the second terminal device.
  • the node performs uplink timing; or, the second terminal device is connected to a second master clock, and the second master clock performs uplink timing for the TSN slave node connected to the first terminal device.
  • the first master clock and the second master clock may be TSN master clocks.
  • the above-mentioned first parameter is used to activate or deactivate the first propagation delay compensation method, which specifically includes: when the first parameter activates the first propagation delay compensation method, the first The propagation delay compensation mode of the terminal device is the first propagation delay compensation mode; when the first parameter deactivates the first propagation delay compensation mode, the propagation delay compensation mode of the first terminal device is the second propagation delay compensation mode , or, stop the propagation delay compensation of the first terminal device.
  • the propagation delay compensation method of the first terminal equipment when the synchronization error is less than the first threshold value, the propagation delay compensation method of the first terminal equipment is the first propagation delay compensation method; when the synchronization error is greater than or equal to At the first threshold value, the propagation delay compensation mode of the first terminal device is the second propagation delay compensation mode, wherein the first threshold value is pre-configured.
  • the accuracy of the above-mentioned first propagation delay compensation method is higher than that of the second propagation delay compensation method.
  • the above-mentioned first propagation delay compensation method is to perform propagation delay compensation according to the first delay compensation value
  • the second propagation delay compensation method is to perform propagation according to the timing advance TA Delay compensation.
  • the CU receives second indication information from the DU, where the second indication information indicates a propagation delay compensation method of the first terminal device.
  • the CU sends third indication information to the first terminal device, where the third indication information indicates a propagation delay compensation method of the first terminal device.
  • a communication apparatus including functional modules for implementing the method in the foregoing first aspect and any possible implementation manner of the first aspect.
  • a communication apparatus including functional modules for implementing the method in the foregoing second aspect and any possible implementation manner of the second aspect.
  • a communication device comprising a processor and an interface circuit, the interface circuit is configured to receive signals from other communication devices other than the communication device and transmit to the processor or send signals from the processor
  • the processor is used to implement the method in the foregoing first aspect and any possible implementation manner of the first aspect through logic circuits or executing code instructions.
  • a communication device comprising a processor and an interface circuit, the interface circuit being configured to receive signals from other communication devices other than the communication device and transmit to the processor or transfer signals from the processor Sent to other communication devices other than the communication device, the processor is used to implement the method in the foregoing second aspect and any possible implementation manner of the second aspect through a logic circuit or executing code instructions.
  • a computer-readable storage medium is provided, and a computer program or instruction is stored in the computer-readable storage medium.
  • the computer program or instruction is executed, any possibility of the aforementioned first aspect and the first aspect is realized. method in the implementation.
  • a computer-readable storage medium is provided, and a computer program or instruction is stored in the computer-readable storage medium.
  • the computer program or instruction is executed, any possibility of the aforementioned second aspect and the second aspect is realized. method in the implementation.
  • a computer program product containing instructions, when the instructions are executed, the methods in the aforementioned first aspect and any possible implementation manner of the first aspect are implemented.
  • a tenth aspect provides a computer program product comprising instructions that, when executed, implement the second aspect and the method in any possible implementation manner of the second aspect.
  • a computer program includes codes or instructions that, when the codes or instructions are executed, implement the method in the foregoing first aspect and any possible implementation manner of the first aspect.
  • a twelfth aspect provides a computer program, the computer program includes codes or instructions that, when the codes or instructions are executed, implement the method in the aforementioned second aspect and any possible implementation manner of the second aspect.
  • a thirteenth aspect provides a chip system, the chip system includes a processor, and may further include a memory, for implementing at least one of the methods described in the first aspect and the second aspect.
  • the chip system can be composed of chips, and can also include chips and other discrete devices.
  • a fourteenth aspect provides a communication system, where the communication system includes the apparatus of the third aspect or the fifth aspect, and the apparatus of the fourth aspect or the sixth aspect.
  • FIG. 1 is a schematic diagram of an industrial control system implemented by using a wireless network to which an embodiment of the application is applicable;
  • FIG. 2a is a schematic diagram of a protocol layer structure between a terminal device and a network device provided by an embodiment of the present application;
  • FIG. 2b is a schematic diagram of a CU-DU separation architecture provided by an embodiment of the present application.
  • FIG. 2c is a schematic diagram of another CU-DU separation architecture provided by an embodiment of the present application.
  • FIG. 2d is a schematic diagram of the distribution of an air interface protocol stack provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of an uplink time adjustment provided by an embodiment of the present application.
  • FIG. 4a is a schematic diagram of a 5G clock and a TSN clock provided by an embodiment of the present application
  • FIG. 4b is a schematic diagram of an uplink timing scenario of a TSN applying a 5G system according to an embodiment of the present application
  • FIGS 5 and 6 are schematic flowcharts of an uplink timing method provided by an embodiment of the present application.
  • FIG. 7 and FIG. 8 are schematic structural diagrams of possible communication apparatuses provided by embodiments of the present application.
  • FIG. 9 is a schematic structural diagram of an access network device according to an embodiment of the present application.
  • LTE long term evolution
  • 5th generation 5th generation
  • WiFi Wireless Fidelity
  • future communication system a system that integrates multiple communication systems, etc.
  • NR new radio
  • eMBB enhanced mobile broadband
  • ultra-reliable and low-latency communication ultra-reliable and low-latency communication
  • URLLC ultra-reliable low-latency communication
  • MTC machine type communication
  • mMTC massive machine type communication
  • D2D device-to-device
  • V2X vehicle to vehicle
  • IoT Internet of things
  • "/" may indicate that the objects associated before and after are an "or” relationship, for example, A/B may indicate A or B; “and/or” may be used to describe that there are three types of associated objects A relationship, eg, A and/or B, can mean that A exists alone, A and B exist simultaneously, and B exists alone. where A and B can be singular or plural.
  • words such as “first” and “second” may be used to distinguish technical features with the same or similar functions. The words “first”, “second” and the like do not limit the quantity and execution order, and the words “first”, “second” and the like do not limit the difference.
  • words such as “exemplary” or “for example” are used to represent examples, illustrations or illustrations, and the embodiments or designs described as “exemplary” or “for example” should not be construed as More preferred or advantageous over other embodiments or designs.
  • the use of words such as “exemplary” or “such as” is intended to present the relevant concepts in a specific manner to facilitate understanding.
  • FIG. 1 is a schematic diagram of an industrial control system implemented by using a wireless network to which an embodiment of the present application is applied.
  • the terminal device 130 is connected to the wireless network to obtain the services of the external network (such as the Internet) through the wireless network, or to communicate with other devices through the wireless network, such as communication with the control device.
  • the wireless network includes a radio access network (RAN) device 110 and a core network device 120, wherein the RAN device 110 is used to access the terminal device 130 to the wireless network, and the CN device 120 is used to manage the terminal and Provides a gateway to communicate with the external network.
  • RAN radio access network
  • the terminal device 130 can be a device with a wireless communication function, which can be connected to a slave node (slave) in the industrial control system through an adapter, so as to receive the data sent by the master node (master) to the slave node and send it to the slave through the wireless network, or The data sent by the slave to the master is sent to the master through the wireless network.
  • the master can be a console and the slave can be an operating arm.
  • the terminal equipment, RAN equipment, and CN equipment involved in FIG. 1 will be described in detail below.
  • the terminal equipment involved in the embodiments of the present application may also be referred to as a terminal, a user equipment (user equipment, UE), a mobile station, a mobile terminal, and the like.
  • Terminal equipment can be mobile phones, tablet computers, computers with wireless transceiver functions, virtual reality terminal equipment, augmented reality terminal equipment, wireless terminals in industrial control, wireless terminals in unmanned driving, wireless terminals in remote surgery, and smart grids wireless terminals in transportation security, wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • the embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device.
  • the terminal device may be connected to the slave.
  • the terminal device can be independent of the slave or integrated with the slave; when the terminal device can be independent of the slave, the terminal device can refer to a device with wireless communication function, which can be connected with the slave for connecting the slave with the wireless network ;
  • the terminal device may refer to a device integrating a slave physical entity and a wireless communication function, such as a chip system.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the RAN may include one or more RAN devices, and the interface between the RAN device and the terminal device may be a Uu interface (or called an air interface).
  • the names of these interfaces may remain unchanged, or may be replaced with other names, which are not limited in this application.
  • a RAN device is an access device that a terminal device wirelessly accesses into a mobile communication system. It can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), or a 5G mobile communication system. The next generation NodeB (gNB), the base station in the future mobile communication system or the access node in the WiFi system, etc.
  • a RAN device may include a centralized unit (CU), or a distributed unit (DU), or a CU and a DU.
  • the control plane protocol layer structure may include a radio resource control (RRC) layer, a packet data convergence protocol (packet data convergence protocol, PDCP) layer. , radio link control (radio link control, RLC) layer, media access control (media access control, MAC) layer and physical layer; user plane protocol layer structure may include PDCP layer, RLC layer, MAC layer and physical layer, in a possible implementation, the PDCP layer may further include a service data adaptation protocol (SDAP) layer.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC media access control
  • SDAP service data adaptation protocol
  • the data transmission needs to go through the user plane protocol layer, such as the SDAP layer, PDCP layer, RLC layer, MAC layer, and physical layer, among which SDAP layer, PDCP layer,
  • the RLC layer, the MAC layer, and the physical layer may also be collectively referred to as the access layer.
  • data is transmitted between the access network device and the terminal device by establishing at least one data radio bearer (DRB), and each DRB may correspond to a set of functional entities, such as including a PDCP layer entity, the At least one RLC layer entity corresponding to the PDCP layer entity, at least one MAC layer entity corresponding to the at least one RLC layer entity, and at least one physical layer entity corresponding to the at least one MAC layer entity.
  • DRB and SRB can be collectively referred to as radio bearer (RB) .
  • the downward arrow in FIG. 2a indicates data transmission
  • the upward arrow indicates data reception.
  • the SDAP layer entity obtains the data from the upper layer, it can map the data to the PDCP layer entity of the corresponding DRB according to the QoS flow indicator (QFI) of the data, and the PDCP layer entity can transmit the data to at least one corresponding to the PDCP layer entity.
  • QFI QoS flow indicator
  • One RLC layer entity is further transmitted by at least one RLC layer entity to the corresponding MAC layer entity, and then the MAC layer entity generates a transport block, and then performs wireless transmission through the corresponding physical layer entity.
  • the data is encapsulated correspondingly in each layer.
  • the data received by a certain layer from the upper layer of the layer is regarded as the service data unit (SDU) of the layer, and becomes the protocol data unit (protocol data unit) after layer encapsulation. unit, PDU), and then passed to the next layer.
  • SDU service data unit
  • PDU protocol data unit
  • the data received by the PDCP layer entity from the upper layer is called PDCP SDU
  • the data sent by the PDCP layer entity to the lower layer is called PDCP PDU
  • the data received by the RLC layer entity from the upper layer is called RLC SDU
  • the data sent by the RLC layer entity to the lower layer Called RLC PDU can be transmitted between different layers through corresponding channels.
  • data can be transmitted between the RLC layer entity and the MAC layer entity through a logical channel (LCH), and the MAC layer entity and the physical layer entity can be transmitted through the A transport channel to transmit data.
  • LCH logical channel
  • the terminal device also has an application layer and a non-access layer; wherein, the application layer can be used to provide services to applications installed in the terminal device, for example, the terminal device receives Downlink data can be sequentially transmitted from the physical layer to the application layer, and then provided by the application layer to the application program; for another example, the application layer can obtain the data generated by the application program, transmit the data to the physical layer in turn, and send it to other communication devices.
  • the non-access layer can be used for forwarding user data, for example, forwarding the uplink data received from the application layer to the SDAP layer or forwarding the downlink data received from the SDAP layer to the application layer.
  • the RAN device may include one or more centralized units (centralized units, CUs) and one or more distributed units (distributed units, DUs), and multiple DUs may be centrally controlled by one CU.
  • centralized units centralized units, CUs
  • distributed units distributed units
  • multiple DUs may be centrally controlled by one CU.
  • an interface between a CU and a DU may be referred to as an F1 interface, wherein a control plane (control panel, CP) interface may be an F1-C, and a user plane (user panel, UP) interface may be an F1-U.
  • the CU and DU can be divided according to the protocol layer of the wireless network: for example, as shown in Figure 2b, the functions of the PDCP layer and the above protocol layers are set in the CU, and the functions of the protocol layers below the PDCP layer (such as the RLC layer and the MAC layer, etc.) are set in the DU.
  • the above division of the processing functions of CU and DU according to the protocol layer is only an example, and can also be divided in other ways, for example, the functions of the protocol layer above the RLC layer are set in the CU, and the RLC layer and the following protocol layers.
  • the function of the CU is set in the DU.
  • the CU or DU can be divided into functions with more protocol layers.
  • the CU or DU can also be divided into partial processing functions with protocol layers. In one design, some functions of the RLC layer and functions of the protocol layers above the RLC layer are placed in the CU, and the remaining functions of the RLC layer and the functions of the protocol layers below the RLC layer are placed in the DU.
  • the functions of the CU or DU can also be divided according to the service type or other system requirements, for example, by the delay, the functions whose processing time needs to meet the delay requirements are set in the DU, and do not need to meet the delay.
  • the required functionality is set in the CU.
  • the CU may also have one or more functions of the core network.
  • the CU can be set on the network side to facilitate centralized management; the DU can have multiple radio functions, or the radio functions can be set remotely. This embodiment of the present application does not limit this.
  • the functions of the CU may be implemented by one entity, or may also be implemented by different entities.
  • the functions of the CU can be further divided, that is, the control plane and the user plane can be separated and implemented by different entities, namely the control plane CU entity (ie the CU-CP entity) and the user plane CU entity. (ie the CU-UP entity), the CU-CP entity and the CU-UP entity can be coupled with the DU to jointly complete the functions of the RAN device.
  • the interface between the CU-CP entity and the CU-UP entity may be the E1 interface
  • the interface between the CU-CP entity and the DU may be the F1-C interface
  • the interface between the CU-UP entity and the DU may be the F1-U interface interface.
  • one DU and one CU-UP can be connected to one CU-CP.
  • one DU can be connected to multiple CU-UPs
  • one CU-UP can be connected to multiple DUs.
  • FIG. 2d is a schematic diagram of the distribution of an air interface protocol stack.
  • the air interface protocol stack may be RLC, MAC, and PHY in the DU, and PDCP and above protocol layers in the CU.
  • the signaling generated by the CU may be sent to the terminal device through the DU, or the signaling generated by the terminal device may be sent to the CU through the DU.
  • the DU may not parse the signaling, but directly encapsulate it through the protocol layer and transparently transmit it to the terminal device or CU.
  • the sending or receiving of the signaling by the DU includes this scenario.
  • the signaling of the RRC or PDCP layer will eventually be processed as the data of the physical layer and sent to the terminal device, or converted from the received data of the physical layer.
  • the signaling of the RRC or PDCP layer can also be considered to be sent by the DU, or sent by the DU and the radio frequency device.
  • CN may include one or more CN devices.
  • CN may include access and mobility management function (AMF) network elements, session management function (SMF) ) network element, user plane function (UPF) network element, policy control function (PCF) network element, unified data management (unified data management, UDM) network element, application function (application function, AF) ) network element, network exposure function (NEF) network element, unified data repository (unified data repository, UDR) network element, etc.
  • AMF access and mobility management function
  • SMF session management function
  • UPF user plane function
  • PCF policy control function
  • unified data management unified data management
  • UDM application function
  • application function application function
  • AF application function
  • NEF network exposure function
  • UDR unified data repository
  • the AMF network element is the control plane network element provided by the operator's network. It is responsible for the access control and mobility management of the terminal equipment accessing the operator's network, such as the management of mobility status, the allocation of user temporary identities, and the authentication and authorization of users. .
  • the SMF network element is the control plane network element provided by the operator's network and is responsible for managing the PDU sessions of the terminal equipment.
  • a PDU session is a channel for transmitting PDUs. Terminal devices need to communicate PDUs with the DN through the PDU session.
  • the PDU session is established, maintained and deleted by the SMF network element.
  • SMF network elements include session management (such as session establishment, modification and release, including tunnel maintenance between UPF and RAN), selection and control of UPF network elements, service and session continuity (SSC) mode selection, Session related functions such as roaming.
  • the UPF network element is the gateway provided by the operator, and is the gateway for the communication between the operator's network and the DN.
  • UPF network elements include user plane-related functions such as data packet routing and transmission, packet detection, service usage reporting, Quality of Service (QoS) processing, legal interception, uplink packet detection, and downlink packet storage.
  • QoS Quality of Service
  • the PCF network element is a control plane function provided by the operator, and is used to provide the SMF network element with the policy of the PDU session.
  • the policies may include charging-related policies, QoS-related policies, authorization-related policies, and the like.
  • the UDM network element is the control plane network element provided by the operator, which is responsible for storing the subscriber permanent identifier (SUPI), security context (security context), subscription data and other information of the subscriber in the operator's network.
  • SUPI subscriber permanent identifier
  • security context security context
  • subscription data and other information of the subscriber in the operator's network.
  • the AF network element is a functional network element that provides various business services, can interact with the core network through other network elements, and can interact with the policy management framework for policy management.
  • the CN may also include other possible network elements, such as a network exposure function (NEF) network element, a unified data repository (UDR) network element, and the NEF network element is used to provide network capability exposure related
  • NEF network exposure function
  • UDR unified data repository
  • the framework, authentication and interface of the 5G system transmit information between network functions of the 5G system and other network functions; UDR network elements are mainly used to store user-related subscription data, policy data, structured data for opening, and application data.
  • the downlink is sent from the base station.
  • c is the speed of light.
  • ⁇ T 2 d 2 /c, where d 2 is the distance between the base station and the terminal device 2 .
  • the terminal device 1 If the terminal device 1 does not adjust the uplink timing, it sends the uplink signal to the base station with the start time of receiving the downlink signal as the reference, and the interval from the start time of the terminal device 1 sending the uplink signal to the start time of the base station receiving the uplink signal is also: ⁇ T 1 . Therefore, for terminal device 1, there is a time difference of 2 ⁇ T 1 from the start time of sending the downlink signal to the start time of receiving the uplink signal. There is a time difference of 2 ⁇ T 2 at the start of the signal.
  • the terminal devices Due to the different distances between each terminal device and the base station, the time at which the uplink signal arrives at the base station is different, resulting in a possible timing deviation between the terminal devices.
  • the timing deviation is greater than a cyclic prefix (CP) of an orthogonal frequency division multiple (orthogonal frequency division multiple, OFDM) symbol
  • the terminal devices may interfere with each other.
  • the terminal devices need to perform timing adjustment to realize uplink synchronization. As shown in (b) of FIG.
  • the terminal equipment 1 advances the start time of sending the uplink signal by 2 ⁇ T 1
  • the terminal equipment 2 advances the start time of sending the uplink signal by 2 ⁇ T 2
  • the base station will receive the terminal at the same time
  • the uplink signal of device 1 and terminal device 2 so as to solve the problem of mutual interference between terminal devices.
  • the base station may determine a timing advance (timing advance, TA) value (the one-way transmission delay between the base station and the terminal device is equal to one-half of the TA, taking the terminal device 1 as an example, the unidirectional transmission delay between the base station and the terminal device 1
  • the transmission delay is ⁇ T 1
  • a timing advance command (TAC) is sent to the terminal device, and the terminal device can determine the TA according to the timing advance command; the base station and the terminal device can both maintain the TA.
  • TA timing advance
  • the base station may determine the timing advance command according to the random access preamble sent by the terminal device, and send the timing advance command to the terminal device through a random access response (RAR).
  • Advance command correspondingly, the terminal device can obtain TA according to the timing advance command.
  • the timing advance command may include 12 bits (the corresponding value range is 0-3846).
  • the timing advance command may indicate an adjustment amount of the TA (referred to as a first adjustment amount for convenience of description), and then the terminal device may calculate the TA according to the first adjustment amount.
  • the terminal device can determine TA with the following formula:
  • Tc is the minimum time unit defined by the 5G communication system
  • the value of ⁇ and the uplink transmission message after RAR (such as the random access process
  • SCS subcarrier space
  • step 520.83 nanoseconds.
  • the specific implementation of determining N TA,offset by the terminal device may refer to the existing solution. In an example, N TA,offset may be equal to 0.
  • the base station may send a timing advance command to the terminal device in the connected state.
  • the timing advance may become invalid due to various reasons, therefore, the terminal device needs to continuously update the timing advance.
  • there can be various reasons for the failure of the timing advance For example, for a terminal device in high-speed movement (such as a terminal device on a running high-speed rail), the transmission delay between the terminal device and the network device will change constantly, and then it is necessary to continuously Update the timing advance.
  • the base station determines the timing advance command according to the uplink signal sent by the terminal device, and sends the timing advance command to the terminal device through a MAC control element (control element, CE).
  • the timing advance command may include 6 bits (the corresponding value range is 0 to 63), and the timing advance command may indicate the adjustment amount of the TA (for the convenience of description, referred to as the second adjustment amount), and then the terminal device can adjust according to the second adjustment amount. Calculate TA.
  • the terminal device can determine TA (also called TAnew) by the following formula:
  • TAnew is the current uplink timing advance of the terminal device
  • TAold is the previous uplink timing advance of the terminal device.
  • FIG. 4a it is a clock synchronization system applied to industrial control for 5G network.
  • the middle part in Figure 4a belongs to the 5G network.
  • Network elements such as UPF, gNB, and UE in the 5G network maintain a common clock, that is, the 5G clock.
  • the 5G clock of each 5G network element in Figure 4a comes from the same master clock, namely "5G master clock (5th generation grand master clock, 5G GM)", 5G GM can be a global positioning system (global position system, GPS)
  • the module which maintains GPS time, can also be other types of high-precision clocks, which are not limited.
  • both the NW-TT on the UPF side and the DS-TT on the UE side maintain a common TSN clock.
  • the TSN clock may also be called the master clock of the TSN domain.
  • NW-TT is an interface module embedded in UPF
  • it can be regarded as UPF or NW-TT maintaining two clocks at the same time: 5G clock and TSN clock .
  • the UE side is similar. It can be regarded as the UE or DS-TT maintaining two clocks at the same time: the 5G clock and the TSN clock.
  • the 5G system transmits the control information of multiple production lines at the same time, and each production line uses its own TSN clock, such as TSN1, TSN2, etc.
  • the UPF and the UE can maintain the 5G clock and multiple TSN clocks at the same time.
  • the number of TSN clocks maintained by the UE and the UPF is usually different.
  • the number of industrial terminals maintained by the UE is usually related to the number of production lines.
  • FIG. 4b is a schematic diagram of uplink timing of a TSN applying 5GS according to an embodiment of the present application.
  • UE1 is connected to a TSN slave node (slave1), and the TSN master clock is located on the TSN slave node.
  • the TSN master clock and slave1 are drawn in different boxes. It should be understood that in actual deployment, the TSN master clock and slave1 may be deployed on one physical entity.
  • the PTP message is first sent by UE1 to the UPF through the upstream QoS flow (QoS flow), and the UPF includes the network side TSN adapter (Network Adapter). -side TSN translator, NW-TT), and then sent to UE2 by UPF through downlink QoS flow. That is, the transmission path of the PTP message is from UE1 to the UPF through the base station, then to the base station through the UPF, and finally to UE2 (UE1->gNB->UPF->gNB->UE2).
  • the DS-TT of UE1 adds the 5G timestamp as Tin, and the DS-TT of UE2 sends the PTP
  • the 5G time of the message is Tout
  • the DS-TT of UE2 adds the value of Tout-Tin to the correctionField field of the PTP message, which indicates the time that the PTP message stays in the 5G system.
  • UE1 and UE2 realize time synchronization through the value of Tout-Tin.
  • An implementation manner may be: the base station indicates a 5G time at a reference time point to the UE, and TA, the UE adjusts its own 5G clock after performing propagation delay compensation according to the 5G time indicated by the base station and half of the TA. , so as to maintain 5G time synchronization with the base station.
  • the part of N TA,offset *Tc in the TA may be ignored.
  • the error mainly comes from: the error introduced by the hardware when the base station receives and sends the signal, and the error caused by the hardware when the UE receives and sends the signal. And, the error introduced by TA adjustment granularity/step size.
  • the synchronization error ⁇ 1 between the UE and the base station can reach 540 nanoseconds.
  • an embodiment of the present application provides an uplink timing method, in which an access network device (base station) can determine the propagation delay compensation mode required by the terminal device according to the auxiliary information, and then instruct the terminal device;
  • the indication information of the network access device determines the propagation delay compensation method, thereby ensuring the synchronization accuracy between the terminal device and the access network device, and thus ensuring the synchronization error requirement between the master clock of the TSN domain and the TSN slave in the uplink timing scenario.
  • FIG. 5 is a schematic flowchart of the uplink timing method provided by Embodiment 1 of the present application. This embodiment relates to a specific process of uplink timing between terminal equipment, access network equipment, and core network equipment. As shown in FIG. 5 , the above method may include S501 to S508, wherein S507 and S508 are optional, S501 may be replaced by S501a, and the embodiment of the present application does not limit the execution order of S501 to S508.
  • the core network device sends second information to the CU, and correspondingly, the CU receives the second information from the core network device.
  • the core network device may be an SMF, an AMF, or a UPF, which is not limited in this embodiment of the present application.
  • the first embodiment is described by taking the SMF sending the second information to the CU as an example.
  • the second information includes the first parameter, and/or a synchronization error.
  • the second information may be time-sensitive communication assistance information (TSCAI).
  • TSCAI time-sensitive communication assistance information
  • the second information may be sent by the SMF to the AMF, and then forwarded by the AMF to the CU.
  • the SMF sends the second information to the AMF, and the second information is carried in the Namf_Communication_N1N2MessgeTransfer message.
  • the AMF receives the Namf_Communication_N1N2MessgeTransfer message from the SMF, and the AMF obtains the second information by parsing the Namf_Communication_N1N2MessgeTransfer message; the AMF forwards the first message to the CU.
  • Second information the second information may be carried in the N2 message, correspondingly, the CU receives the N2 message from the AMF, and the CU obtains the second information by parsing the N2 message.
  • the second information may be per QoS flow, and each QoS flow may be associated with one or more terminal devices.
  • the CU receives the second information, it determines one or more terminal devices associated with the second information according to the QoS flow associated with the second information and one or more terminal devices associated with the QoS flow.
  • the following description takes the first terminal device as an example, where the first terminal device is any one of one or more terminal devices associated with the second information.
  • the second information includes may include synchronization errors.
  • the synchronization error may refer to the maximum allowable 5G time deviation when the first terminal device performs 5G time synchronization with the access network device on the air interface; or, the synchronization error may also refer to the difference between the first terminal device and the core network device. The maximum allowed 5G time deviation between.
  • the value unit of the synchronization error may be seconds/milliseconds/microseconds/nanoseconds/femtoseconds, where the value unit is preset by the protocol.
  • the value unit is preset by the protocol.
  • the unit may be a second/a millisecond/a microsecond/ a nanosecond/a femtosecond, a is a positive number, and the value of a is preset by the protocol.
  • the second information may include the first parameter.
  • the first parameter indicates whether the first terminal device needs uplink timing. Wherein, the first terminal device needs to provide uplink timing, which may specifically include two situations:
  • the first terminal device is connected to the first master clock, and the first master clock provides timing for the TSN slave node connected to the second terminal device, that is, the first master clock connected to the first terminal device needs to be connected to the second terminal device.
  • the TSN slave node sends a timing message, and the timing message is sent by the first master clock via the first terminal equipment, the first access network equipment connected to the first terminal equipment, the core network equipment, and the second terminal equipment connected to the second terminal equipment.
  • the network access device and the second terminal device finally reach the TSN slave node to which the second terminal device is connected.
  • the second terminal device is connected to the second master clock, and the second master clock provides timing for the TSN slave node connected to the first terminal device, that is, the TSN slave node connected to the first terminal device needs to receive the TSN slave node connected to the second terminal device.
  • the second master clock sends timing messages to synchronize the TSN clock.
  • the timing message is generated by the second master clock via the second terminal device, the second access network device connected to the second terminal device, the core network device, and the first access network device and the first terminal device connected to the first terminal device, Finally, the TSN slave node to which the first terminal device is connected is reached.
  • both the first master clock and the second master clock are TSN master clocks.
  • the access network device connected to the first terminal device and the access network device connected to the second terminal device may be the same or different.
  • the manner in which the first parameter indicates whether the first terminal device needs uplink timing includes but is not limited to any of the following:
  • Mode 2 When the value of the first parameter is "0", it means that the first terminal equipment needs to be uplinked; when the value of the first parameter is "1”, it means that the first terminal equipment does not need to be uplinked; When the value of a parameter is "1”, it indicates that the first terminal device needs uplink timing, and when the value of the first parameter is "0", it indicates that the first terminal device does not need uplink timing.
  • the SMF needs to determine whether the first terminal device needs uplink timing.
  • the first terminal device indicates to the SMF whether the first terminal device is connected to the TSN master clock through a non-access stratum (non-access stratum, NAS) message.
  • the NAS message carries TSN domain information and indication information, wherein the indication information indicates whether the first terminal device is connected to the TSN master clock.
  • the CU sends the first information to the DU according to the second information, and correspondingly, the DU receives the first information from the CU.
  • the first information includes a first parameter, and/or a synchronization error. See S501 for the description of the first parameter and the synchronization error.
  • the first information may be TSCAI.
  • the first information may be carried on a user equipment context setup request (UE Context Setup Request) message, or a user equipment context modification request (UE Context Modification Request) message.
  • UE Context Setup Request user equipment context setup request
  • UE Context Modification Request user equipment context modification request
  • the first information and the second information may be the same or different.
  • the CU sending the first information to the DU according to the second information may be understood as: the CU forwards the second information from the core network device (eg SMF) to the DU.
  • the CU sending the first information to the DU according to the second information can be understood as: the CU uses the first information to synchronize the first parameters and/or synchronization from the core network device (eg SMF) Errors are forwarded to the DU.
  • the CU in addition to sending the first information to the DU, the CU also sends the identifier of the first terminal device to the DU.
  • the DU determines that the terminal device corresponding to the first information is the first terminal device.
  • the DU determines the delay compensation mode of the first terminal device according to the first information.
  • the manner in which the DU determines the delay compensation manner of the first terminal device according to the first information includes but is not limited to the following three:
  • the first parameter is used to indicate whether the first terminal device needs uplink timing, and the DU determines the first parameter according to the first parameter. Delay compensation method of terminal equipment.
  • the propagation delay compensation method of the first terminal equipment is the first propagation delay compensation method; when the first parameter indicates that the first terminal equipment does not need uplink timing
  • the propagation delay compensation mode of the first terminal equipment is the second propagation delay compensation mode.
  • the first parameter is used to activate or deactivate the first propagation delay compensation mode of the first terminal device.
  • a parameter determines the delay compensation mode of the first terminal device.
  • the propagation delay compensation mode of the first terminal device when the first parameter activates the first propagation delay compensation mode, the propagation delay compensation mode of the first terminal device is the first propagation delay compensation mode; when the first parameter deactivates the first propagation delay compensation mode , the propagation delay compensation mode of the first terminal device is the second propagation delay compensation mode, or the propagation delay compensation of the first terminal device is stopped.
  • the first parameter when the first parameter activates the first propagation delay compensation mode, it can also be understood that the first parameter indicates that the first terminal equipment needs to be uplinked; when the first parameter deactivates the first propagation delay In the compensation mode, it can also be understood that the first parameter indicates that the first terminal device does not need uplink timing.
  • Mode 3 The DU determines a delay compensation mode of the first terminal device according to the synchronization error.
  • the propagation delay compensation mode of the first terminal device is the first propagation delay compensation mode; when the synchronization error is greater than or equal to the first threshold value, the propagation delay compensation mode of the first terminal device
  • the delay compensation method is the second propagation delay compensation method.
  • the first threshold value is pre-configured; or, the first threshold value may be determined by the DU according to the used subcarrier spacing, for example, when the DU uses a carrier with a subcarrier spacing of 15 kHz and the When a terminal device communicates, the first threshold value is 545 nanoseconds.
  • the first propagation delay compensation method is to perform propagation delay compensation according to the first delay compensation value
  • the second propagation delay compensation manner is to perform propagation delay compensation according to TA.
  • the accuracy of the first propagation delay compensation method is higher than that of the second propagation delay compensation method.
  • the DU sends the first indication information to the first terminal device, and correspondingly, the first terminal device receives the first indication information from the DU.
  • the first indication information indicates a delay compensation mode of the first terminal device.
  • the DU When the DU determines that the delay compensation mode of the first terminal device is the first delay compensation mode, the DU sends a propagation delay compensation (propagation delay compensation, PDC) signaling (that is, the first indication information is PDC signaling) to the first terminal device. make).
  • PDC propagation delay compensation
  • the first terminal device receives the PDC signaling, the first terminal device performs propagation delay compensation for the 5G time indicated by the access network device according to the first delay compensation value carried in the PDC signaling.
  • the name of the above PDC signaling is only an example, and the embodiment of the present application does not limit the name of the signaling.
  • the PDC signaling includes a first delay compensation value
  • the unit of the first delay compensation value may be preset in the protocol.
  • the unit of the first delay compensation value may be seconds/milliseconds/ In addition to microseconds/nanoseconds, it may also be a second/a millisecond/a microsecond/a nanosecond/a femtosecond, etc. where a is a positive number, which is not limited in this embodiment of the present application.
  • the first terminal device determines the current first time delay.
  • the PDC signaling includes the first delay compensation value and the indication information A.
  • the indication information A is used to indicate the unit or granularity of the first delay compensation value.
  • the protocol predefines four granularities, which are respectively 5 nanoseconds, 10 nanoseconds, 25 nanoseconds, and 50 nanoseconds, and the indication information A indicates the granularity of the first delay compensation value through 2 bits. shown in Table 1.
  • Instruction information A Granularity of the first delay compensation value 00 5 nanoseconds 01 10 ns 10 25 ns 11 50 ns
  • the PDC signaling includes indication information B.
  • the indication information B is used to instruct the first terminal device not to perform propagation delay compensation according to the PDC signaling.
  • the indication information B is used to instruct the first terminal device to perform propagation delay compensation according to the PDC signaling.
  • the PDC signaling also includes the first delay compensation value and the indication information A, and the first terminal device according to the first delay compensation value and the first delay carried in the PDC signaling
  • the granularity/unit of the compensation value performs line propagation delay compensation for the 5G time indicated by the base station (eg, CU).
  • the DU determines that the delay compensation mode of the first terminal device is the second delay compensation mode
  • the DU sends a TAC (that is, the first indication information is TAC) to the first terminal device.
  • a TAC that is, the first indication information is TAC
  • the first terminal device receives the TAC
  • the first terminal device performs propagation delay compensation according to the TA carried in the TAC.
  • the first terminal device uses half of the TA to perform propagation delay compensation on the 5G time indicated by the base station (for example, the CU).
  • the CU sends time information to the first terminal device, and correspondingly, the first terminal device receives the time information from the CU. Specifically, the CU sends time information to the first terminal device in a unicast or broadcast manner, where the time information includes the time of the 5G clock corresponding to a reference time point (hereinafter referred to as the first reference time point). Exemplarily, the time of the 5G clock sent by the CU to the first terminal device is 10:00:500 microseconds.
  • the first terminal device compensates the time sent by the CU according to the determined propagation delay compensation method.
  • the first terminal device When the first terminal device receives the PDC signaling, the first terminal device performs propagation delay compensation on the 5G time indicated by the CU based on the first delay compensation method; when the first terminal device receives the TAC, the first terminal device Propagation delay compensation is performed on the 5G time indicated by the CU based on the second delay compensation method.
  • the first terminal device uses the first propagation delay compensation method to perform delay compensation, that is, when the first terminal device performs propagation delay compensation according to the PDC signaling
  • the first terminal device uses the first propagation delay compensation in the PDC signaling.
  • a delay compensation value is added to the 5G time sent by the CU in S505 to obtain the time after propagation delay compensation corresponding to the first reference time point.
  • the 5G time sent by the CU is 10:00:500 microseconds
  • the first delay compensation value in the PDC signaling is 100 microseconds.
  • the time is 10:00:600 microseconds, and the first terminal device adjusts the time of the 5G clock of the first terminal device at the first reference time point to 10:00:600 microseconds.
  • the first terminal device uses the first propagation delay compensation method to perform delay compensation, that is, when the first terminal device performs propagation delay compensation according to the PDC signaling, if the first time delay is not carried in the PDC signaling.
  • the delay compensation value or, when the first terminal device does not receive the first delay compensation value, the first terminal device may add the default delay compensation value to the time sent by the CU in S505 to obtain the propagation delay compensation.
  • time where the default delay compensation value may be the default value preset by the protocol, or may be half of the current TA.
  • the first terminal device uses the second propagation delay compensation method to perform delay compensation, that is, when the first terminal device performs propagation delay compensation according to TA
  • the first terminal device compares half of TA with S505.
  • the time sent by the CU is added to obtain the time after propagation delay compensation.
  • the time sent by the CU is 10:00:500 microseconds
  • the TA is 100 microseconds
  • the time obtained by the first terminal device after performing propagation delay compensation is 10:00:550 microseconds
  • the first A terminal device adjusts the 5G clock of the first terminal device at the first reference time point to 10:00:550 microseconds.
  • the part of N TA,offset *Tc in the TA may be ignored.
  • S501 may be replaced by S501a.
  • S501a The first terminal device sends the third information to the CU, and correspondingly, the CU receives the second and third information from the first terminal device.
  • the third information includes the first parameter and/or the synchronization error. See S501 for the description of the first parameter and the synchronization error.
  • the third information may be carried on an RRC message, such as a user assistance information (UE assistance information, UAI) message.
  • RRC message such as a user assistance information (UE assistance information, UAI) message.
  • UE assistance information UAI
  • the first embodiment may further include at least one of S507 and S508.
  • the CU sends an RRC message to the first terminal device, and correspondingly, the first terminal device receives the RRC message from the CU.
  • the RRC message is used to activate the first propagation delay compensation mode of the first terminal device.
  • the CU sends an RRC message to the first terminal device, and correspondingly, the first terminal device receives the RRC message from the CU.
  • the RRC message is used to deactivate the first propagation delay compensation mode of the first terminal device.
  • the above embodiment provides an uplink timing method.
  • the CU receives auxiliary information of the core network device and sends it to the DU, and the DU determines the propagation delay compensation mode required by the first terminal device according to the auxiliary information, and then indicates to the first terminal. equipment, the first terminal equipment determines the propagation delay compensation method according to the indication information of the DU, so that the time of the first terminal equipment and the access network equipment maintains the precise synchronization of the 5G clock, so that the master clock in the TSN domain is performed by the TSN slave node.
  • the clock information obtained by the TSN slave node meets the synchronization error requirements, thereby ensuring high-precision synchronization between nodes in the TSN domain in industrial application scenarios.
  • the first terminal device does not need to use the first propagation delay compensation mode to perform propagation delay compensation when there is no TSN service requirement, thereby saving Signaling overhead, reducing the complexity of the device.
  • FIG. 6 is a schematic flowchart of an uplink timing method according to Embodiment 2 of the present application. This embodiment relates to a specific process of uplink timing among terminal equipment, access network equipment, and core network equipment. As shown in FIG. 6 , the above method may include S601 to S608, where S601 may be replaced with S601a, and the embodiment of the present application does not limit the execution order of S601 to S608.
  • the core network device sends second information to the CU, and correspondingly, the CU receives the second information from the core network device.
  • the core network device may be an SMF, an AMF, or a UPF, which is not limited in this embodiment of the present application, and the second embodiment is described by taking the SMF sending the second information to the CU as an example. See S501 for the description of the second information.
  • the CU sends the first information to the DU according to the second information.
  • the DU receives the first information from the CU. See S502 for the description of the first information.
  • the DU determines the delay compensation mode of the first terminal device according to the first information. See S503 for specific description.
  • the DU sends the second indication information to the CU, and correspondingly, the CU receives the second indication information from the DU.
  • the second indication information indicates a propagation delay compensation mode of the first terminal device.
  • the second indication information may be carried on the user equipment context setup response (UE Context Setup Response) message, or carried on the user equipment context modification response (UE Context Modification Response) message.
  • the second indication information includes a second parameter, and the second parameter indicates a propagation delay compensation mode of the first terminal device.
  • the second parameter indicates a propagation delay compensation mode of the first terminal device.
  • TAC propagation delay compensation
  • PDC propagation delay compensation
  • the second indication information when the second indication information does not include the second parameter, it means that the first terminal device performs propagation delay compensation according to the TA; when the second indication information includes the second parameter, it means that the first terminal device performs propagation delay compensation according to the TA.
  • the first delay compensation value performs propagation delay compensation.
  • the value of the second parameter may be "PDC" or "True”.
  • the CU sends third indication information to the first terminal device, and correspondingly, the first terminal device receives the third indication information from the CU.
  • the third indication information indicates a propagation delay compensation mode of the first terminal device.
  • the third indication information may be an RRC reconfiguration message.
  • the third indication information includes a third parameter, and the third parameter indicates a propagation delay compensation method of the first terminal device.
  • the third parameter indicates a propagation delay compensation method of the first terminal device.
  • TAC propagation delay compensation method of the first terminal device.
  • PDC propagation delay compensation method of the first terminal device.
  • the third indication information when the third indication information does not include the third parameter, it means that the first terminal device performs propagation delay compensation according to the TA; when the third indication information includes the third parameter, it means that the first terminal device performs propagation delay compensation according to the TA.
  • the first delay compensation value performs propagation delay compensation.
  • the value of the third parameter may be "PDC" or "True”.
  • the DU sends the first indication information to the first terminal device, and correspondingly, the first terminal device receives the first indication information from the DU.
  • the first indication information indicates TA or a first delay compensation value.
  • the CU sends time information to the first terminal device, and correspondingly, the first terminal device receives the time information from the CU. Specifically, the CU sends time information to the first terminal device in a unicast or broadcast manner, where the time information includes the time of the 5G clock corresponding to the first reference time point. Exemplarily, the time of the 5G clock sent by the CU to the first terminal device is 10:00:500 microseconds.
  • the first terminal device compensates for the time sent by the CU according to the determined propagation delay compensation method.
  • the first terminal device uses the first propagation delay compensation method to perform delay compensation, that is, when the first terminal device performs propagation delay compensation according to the PDC signaling
  • the first terminal device uses the first propagation delay compensation in the PDC signaling.
  • a delay compensation value is added to the time sent by the CU in S607 to obtain the time after propagation delay compensation.
  • the time sent by the CU is 10:00:500 microseconds
  • the first delay compensation value in the PDC signaling is 100 microseconds
  • the time obtained by the first terminal device after performing the propagation delay compensation is 10:00:600 microseconds
  • the first terminal device adjusts the time of the 5G clock of the first terminal device at the first reference time point to 10:00:600 microseconds.
  • the first terminal device uses the first propagation delay compensation method to perform delay compensation, that is, when the first terminal device performs propagation delay compensation according to the PDC signaling, if the first time delay is not carried in the PDC signaling.
  • the delay compensation value or, when the first terminal device does not receive the first delay compensation value, the first terminal device may add the default delay compensation value to the time sent by the CU in S607 to obtain the propagation delay compensation.
  • time where the default delay compensation value may be the default value preset by the protocol, or may be half of the current TA.
  • the first terminal device uses the second propagation delay compensation method to perform delay compensation, that is, when the first terminal device performs propagation delay compensation according to TA, the first terminal device compares half of TA with S607.
  • the time sent by the CU is added to obtain the time after propagation delay compensation.
  • the time sent by the CU is 10:00:500 microseconds
  • the TA is 100 microseconds
  • the time obtained by the first terminal device after performing propagation delay compensation is 10:00:550 microseconds
  • the first A terminal device adjusts the 5G clock of the first terminal device at the first reference time point to 10:00:550 microseconds.
  • the part of N TA,offset *Tc in the TA may be ignored.
  • S601 may be replaced by S601a.
  • the first terminal device sends third information to the CU, and correspondingly, the CU receives the third information from the first terminal device.
  • the third information includes the first parameter and/or the synchronization error. See S601 for the description of the first parameter and the synchronization error.
  • the third information may be carried in an RRC message, such as a user assistance information (UAI) message.
  • UAI user assistance information
  • the above embodiment provides an uplink timing method.
  • the CU receives auxiliary information of the core network device and sends it to the DU.
  • the DU determines the propagation delay compensation method required by the first terminal device according to the auxiliary information and sends it to the CU.
  • the propagation delay compensation mode is indicated to the first terminal device, and the first terminal device determines the propagation delay compensation mode according to the instruction information of the CU, so that the time of the first terminal device and the access network device can keep the precise synchronization of the 5G clock, so that the When the master clock of the TSN domain performs uplink timing for the TSN slave node, the clock information obtained by the TSN slave node meets the synchronization error requirement, thereby ensuring high-precision synchronization between nodes in the TSN domain in industrial application scenarios.
  • the CU and the DU may include corresponding hardware structures and/or software modules for performing the respective functions.
  • the units and method steps of each example described in conjunction with the embodiments disclosed in the present application can be implemented in the form of hardware, software, or a combination of hardware and software. Whether a function is performed by hardware, software, or computer software-driven hardware depends on the specific application scenarios and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.
  • the communication device may be a DU in any of the foregoing embodiments, or may also be a chip provided in the DU, or may be a CU in any of the foregoing embodiments, or may also be provided with chip in the CU.
  • the communication apparatus 700 includes a processing unit 710 and a transceiver unit 720 .
  • the communication apparatus 700 is configured to implement the functions of the DU in the method embodiment shown in FIG. 5 or FIG. 6 , or the communication apparatus 700 may include a function for implementing the DU in the method embodiment shown in FIG. A module of any function or operation, which may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • the communication apparatus 700 may also be used to implement the functions of the CU in the method embodiment shown in FIG. 5 or FIG. Any function or operation module of the CU, which can be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • the transceiver unit 720 is used to receive the first information from the CU, where the first information includes the first parameter and/or the synchronization error; processing The unit 710 is configured to determine a propagation delay compensation mode of the first terminal device according to the first information.
  • the transceiver unit 720 is further configured to send first indication information to the first terminal device, where the first indication information indicates a delay compensation mode of the first terminal device.
  • the transceiver unit 720 is configured to receive second information from the core network device, where the second information includes the first parameter and/or the synchronization error ; The transceiver unit 720 is further configured to send the first information to the DU according to the second information.
  • the transceiver unit 720 is further configured to receive third information from the first terminal device, where the third information includes the first parameter and/or the synchronization error.
  • the transceiver unit 720 is further configured to send time information to the first terminal device.
  • the transceiver unit 720 is used to receive the first information from the CU, where the first information includes the first parameter and/or the synchronization error; processing The unit 710 is configured to determine the propagation delay compensation mode of the first terminal device according to the first information; the transceiver unit 720 is further configured to send second indication information to the CU, where the second indication information indicates the propagation delay compensation of the first terminal device Way.
  • the transceiver unit 720 is further configured to send first indication information to the first terminal device, where the first indication information indicates the TA or the first delay compensation value.
  • the transceiver unit 720 is configured to receive second information from the core network device, where the second information includes the first parameter and/or the synchronization error
  • the transceiver unit 720 is further configured to send the first information to the DU according to the second information; the transceiver unit 720 is further configured to receive the second indication information of the DU, wherein the second indication information indicates the propagation delay compensation mode of the first terminal device.
  • the transceiver unit 720 is further configured to receive third information from the first terminal device, where the second and third information includes the first parameter and/or the synchronization error.
  • the transceiver unit 720 is further configured to send third indication information to the first terminal device, where the third indication information indicates a propagation delay compensation mode of the first terminal device.
  • the transceiver unit 720 is further configured to send time information to the first terminal device.
  • FIG. 8 is a schematic structural diagram of another possible communication apparatus provided by an embodiment of the present application.
  • the communication apparatus 800 includes a processor 810 and an interface circuit 820 .
  • the processor 810 and the interface circuit 820 are coupled to each other.
  • the interface circuit 820 can be a transceiver or an input-output interface.
  • the communication apparatus 800 may further include a memory 830 for storing instructions executed by the processor 810 or input data required by the processor 810 to execute the instructions or data generated after the processor 810 executes the instructions.
  • the processor 810 is used to implement the function of the above-mentioned processing unit 710
  • the interface circuit 820 is used to implement the function of the above-mentioned transceiver unit 720 .
  • FIG. 9 is a schematic structural diagram of an access network device according to an embodiment of the present application, where the access network device includes one or more DUs 901 and one or more CUs 902, where the DU 901 can be used to execute the above method embodiments
  • the CU 902 may be used to perform the function of the CU in the above method embodiments.
  • the DU 901 may include at least one antenna 9011, at least one radio frequency unit 9012, at least one processor 9013 and at least one memory 9014.
  • the DU 901 part is mainly used for the transceiver of radio frequency signals, the conversion of radio frequency signals and baseband signals, and part of baseband processing.
  • the CU 902 may include at least one processor 9022 and at least one memory 9021 . Communication between CU902 and DU901 is possible through F1 interface (such as F1-C or F1-U).
  • the CU 902 part is mainly used for baseband processing and the like.
  • the DU 901 and the CU 902 may be physically set together or physically separated. In the embodiment of the present application, the DU 901 and the CU 902 are physically separated and set as an example for description.
  • the network device 90 may include one or more radio frequency units, one or more DUs and one or more CUs.
  • the DU may include at least one processor 9013 and at least one memory 9014
  • the radio unit may include at least one antenna 9011 and at least one radio unit 9012
  • the CU may include at least one processor 9022 and at least one memory 9021 .
  • the CU902 may be composed of one or more single boards, and multiple single boards may jointly support a wireless access network (such as a 5G network) with a single access indication, or may respectively support wireless access systems of different access standards.
  • Access network such as LTE network, 5G network or other network.
  • the memory 9021 and the processor 9022 may serve one or more boards; that is, each board may be provided with a separate memory and processor, or multiple boards may share the same memory and processor .
  • necessary circuits may also be provided on each single board.
  • the DU901 can be composed of one or more single boards, and multiple single boards can jointly support a wireless access network (such as a 5G network) with a single access indication, or can support a wireless access network with different access standards (such as a 5G network). LTE network, 5G network or other network).
  • the memory 9014 and processor 9013 may serve one or more single boards. That is to say, each single board may be provided with a memory and a processor independently, or multiple boards may share the same memory and processor. In addition, necessary circuits may also be provided on each single board.
  • the DU shown in FIG. 9 can implement each process involving the DU in the method embodiment shown in FIG. 5 or FIG. 6 .
  • the operations and/or functions of each module in the DU shown in FIG. 9 are respectively to implement the corresponding processes in the foregoing method embodiments.
  • the CU shown in FIG. 9 can implement each process involving the CU in the method embodiment shown in FIG. 5 or FIG. 6 .
  • the operations and/or functions of each module in the CU shown in FIG. 9 are respectively to implement the corresponding processes in the foregoing method embodiments.
  • the processor in the embodiments of the present application may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application-specific integrated circuits (Application Specific Integrated Circuit, ASIC), Field Programmable Gate Array (Field Programmable Gate Array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.
  • a general-purpose processor may be a microprocessor or any conventional processor.
  • the processor may be a random access memory (Random Access Memory, RAM), a flash memory, a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM, PROM), an erasable memory
  • RAM Random Access Memory
  • ROM read-only memory
  • PROM programmable read-only memory
  • PROM Programmable ROM
  • EEPROM Electrically erasable programmable read-only memory
  • registers hard disk, removable hard disk, CD-ROM or any other form of storage medium known in the art middle.
  • An exemplary storage medium is coupled to the processor, such that the processor can read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and storage medium may reside in an ASIC.
  • the ASIC may be located in a network device or in an end device.
  • the processor and the storage medium may also exist in the network device or the terminal device as discrete components.
  • the computer program product includes one or more computer programs or instructions.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, a network device, a terminal device, or other programmable devices.
  • the computer program or instructions may be stored in or transmitted over a computer-readable storage medium.
  • the computer-readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server that integrates one or more available media.
  • the usable media can be magnetic media, such as floppy disks, hard disks, magnetic tapes; optical media, such as DVD; and semiconductor media, such as solid state disks (SSD).

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

Abstract

Procédé et appareil de synchronisation de liaison montante. Une unité centralisée (CU) reçoit des informations auxiliaires provenant d'un dispositif de réseau central et les envoie à une unité distribuée (DU) ; et la DU détermine, selon les informations auxiliaires, un mode de compensation de retard de propagation requis par un dispositif terminal, et indique ensuite celui-ci au dispositif terminal ; et le dispositif terminal détermine le mode de compensation de retard de propagation selon des informations d'indication de la DU. En mettant en œuvre ledit procédé, le temps d'un dispositif terminal et celui d'un dispositif de réseau d'accès sont maintenus synchronisés avec précision, de sorte que, lorsqu'une horloge de grand-maître d'un domaine de réseau sensible au temps (TSN) réalise une synchronisation de liaison montante pour un nœud esclave TSN, des informations d'horloge 5G obtenues par le nœud esclave TSN satisfassent une exigence d'erreur de synchronisation, garantissant ainsi une synchronisation de précision élevée entre des nœuds du domaine TSN dans un scénario d'application industrielle.
PCT/CN2020/106800 2020-08-04 2020-08-04 Procédé et appareil de synchronisation de liaison montante WO2022027225A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106031259A (zh) * 2014-01-16 2016-10-12 三星电子株式会社 在无线通信系统中用于控制终端的定时的方法及其电子设备
US20190342800A1 (en) * 2018-05-22 2019-11-07 Alexander Sirotkin Mobility management for inter-gnb (next generation node-b) handover in new radio (nr) systems
CN110662283A (zh) * 2018-06-28 2020-01-07 华为技术有限公司 一种时钟同步的方法和装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106031259A (zh) * 2014-01-16 2016-10-12 三星电子株式会社 在无线通信系统中用于控制终端的定时的方法及其电子设备
US20190342800A1 (en) * 2018-05-22 2019-11-07 Alexander Sirotkin Mobility management for inter-gnb (next generation node-b) handover in new radio (nr) systems
CN110662283A (zh) * 2018-06-28 2020-01-07 华为技术有限公司 一种时钟同步的方法和装置

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