WO2020083370A1 - 一种时钟同步方法及装置 - Google Patents

一种时钟同步方法及装置 Download PDF

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Publication number
WO2020083370A1
WO2020083370A1 PCT/CN2019/113250 CN2019113250W WO2020083370A1 WO 2020083370 A1 WO2020083370 A1 WO 2020083370A1 CN 2019113250 W CN2019113250 W CN 2019113250W WO 2020083370 A1 WO2020083370 A1 WO 2020083370A1
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WO
WIPO (PCT)
Prior art keywords
clock
information
terminal
clock domain
domains
Prior art date
Application number
PCT/CN2019/113250
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English (en)
French (fr)
Inventor
朱方园
李永翠
李岩
于峰
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP19876843.4A priority Critical patent/EP3843299B1/en
Publication of WO2020083370A1 publication Critical patent/WO2020083370A1/zh
Priority to US17/208,044 priority patent/US11451316B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • 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
    • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/20—Transfer of user or subscriber data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/60—Types of network addresses
    • H04L2101/618—Details of network addresses
    • H04L2101/622—Layer-2 addresses, e.g. medium access control [MAC] addresses

Definitions

  • This application relates to the technical field of mobile communications, and in particular to a clock synchronization method and device.
  • a terminal can synchronize clocks with a clock source in a clock domain through an access network device, so that the terminal can synchronize clocks with a clock source in the clock domain.
  • a terminal may need to associate clock sources of multiple clock domains.
  • how to achieve clock synchronization between the terminal and the clock sources of multiple clock domains through the access network device is a problem that needs to be solved.
  • the present application provides a clock synchronization method and device for clock synchronization between a terminal and multiple clock sources.
  • the present application provides a clock synchronization method.
  • the method includes: a terminal receives information of N clock domains sent by an access network device, and the information of one clock domain includes first time information of the clock domain and a clock domain number, The first time information includes the time of the clock source in the clock domain when the access network device sends the clock domain information, the clock domain number is used to identify the clock domain, and N is an integer greater than 1; the terminal determines that the terminals in the N clock domains are associated M clock domains, M is a positive integer; the terminal synchronizes clocks with the clock sources of the M clock domains according to the information of the M clock domains. Based on this solution, when a terminal is associated with clock sources of M clock domains, clock synchronization between the terminal and the M clock sources can be achieved.
  • the information in the clock domain further includes a frequency deviation value ratio between the local clock of the access network device and the clock source in the clock domain.
  • the terminal receives the information of the N clock domains sent by the access network device, including:
  • the terminal receives broadcast information sent by the access network device, and the broadcast information includes information of N clock domains; or,
  • the terminal receives unicast information sent by the access network device, and the unicast information includes information of N clock domains; or,
  • the terminal receives N unicast information sent by the access network device, and one unicast information includes information of one clock domain among the N clock domains.
  • the access network device can send information of N clock domains to the terminal through various implementation methods.
  • the terminal determining the M clock domains associated with the terminal in the N clock domains includes: during the session establishment process, the terminal obtains clocks of the M clock domains associated with the terminal from the core network element Domain number, where the core network element stores the association between the terminal identification and the clock domain numbers of M clock domains;
  • the terminal identification includes one or more of the following:
  • IP address associated with the session The IP address associated with the session
  • At least one media access control MAC address associated with the terminal At least one media access control MAC address associated with the terminal.
  • the terminal determining the M clock domains associated with the terminal in the N clock domains includes: the terminal obtains the clock domain numbers of the M clock domains associated with the terminal from the core network element, the core network The element includes a data management network element or a policy control network element; wherein, the core network element stores the association relationship between the terminal's subscription information and the clock domain numbers of the M clock domains associated with the terminal, or the core network element stores the terminal's Contract information and the contract information includes clock domain numbers of M clock domains.
  • the terminal can determine the M clock domains associated with the terminal in many different ways.
  • the terminal and the access network device before the terminal receives the information of the N clock domains sent by the access network device, the terminal and the access network device perform timing advance measurement to obtain a timing advance value.
  • the timing advance value is used to determine the terminal and the access Transmission delay between network devices.
  • the terminal performs clock synchronization with the clock sources of the M clock domains according to the information of the M clock domains, including: for the i-th clock domain of the M clock domains, the terminal according to the information of the i-th clock domain And the timing advance value to determine the second time information of the i-th clock domain, the second time information includes the time of the clock source of the i-th clock domain when the terminal receives the information of the i-th clock domain sent by the access network device, i takes 1 To M.
  • the terminal can perform clock synchronization with clock sources of M clock domains, respectively, to achieve clock synchronization between the terminal and one or more clock sources.
  • the present application provides a clock synchronization method.
  • the method includes: clock synchronization of an access network device and clock sources of N clock domains; access network device and clock synchronization of clock sources of the N clock domains After completion, send information of N clock domains to the terminal.
  • the information of one clock domain includes the first time information and clock domain number of the clock domain.
  • the first time information includes the clock domain clock when the access network device sends the information of the clock domain.
  • the time of the source, the clock domain number is used to identify the clock domain, and N is an integer greater than 1.
  • the access network device can send the clock sources of the N clock domains supported by the base station to the terminal, so that the base station can select the clock domain associated with the terminal from the N clock sources for clock synchronization.
  • the information in the clock domain further includes a frequency deviation value ratio between the local clock of the access network device and the clock source in the clock domain.
  • the access network device sends N clock domain information to the terminal, including:
  • the access network device sends broadcast information, which includes information of N clock domains; or,
  • the access network device sends unicast information to the terminal, and the unicast information includes information of N clock domains; or,
  • the access network device sends N unicast information to the terminal, and one unicast information includes information of one clock domain among the N clock domains.
  • the access network device can send information of N clock domains to the terminal through various implementation methods.
  • the access network device before the access network device sends the information of N clock domains to the terminal, the access network device receives the clock domain numbers of the N clock domains sent by the terminal or the core network element.
  • the present application provides a clock synchronization method, which includes: a terminal sends clock domain numbers of M clock domains associated with the terminal to an access network device, where M is a positive integer; The information of the M clock domains corresponding to the clock domain number.
  • the information of one clock domain includes the first time information of the clock domain and the clock domain number.
  • the first time information includes the information of the clock domain sent by the access network device when the clock domain clock source.
  • the time, the clock domain number is used to identify the clock domain, and N is an integer greater than 1.
  • the terminal synchronizes clocks with the clock sources of the M clock domains according to the information of the M clock domains. Based on this solution, when a terminal is associated with clock sources of M clock domains, clock synchronization between the terminal and the M clock sources can be achieved.
  • the information in the clock domain further includes a frequency deviation value ratio between the local clock of the access network device and the clock source in the clock domain.
  • the terminal receives the information of the M clock domains corresponding to the M clock domain numbers sent by the access network device, including:
  • the terminal receives broadcast information sent by the access network device, and the broadcast information includes information of M clock domains; or,
  • the terminal receives unicast information sent by the access network device, and the unicast information includes information of M clock domains; or,
  • the terminal receives M unicast information sent by the access network device, and one unicast information includes information of one clock domain among the M clock domains.
  • the access network device can send information of N clock domains to the terminal through various implementation methods.
  • the terminal determines the M clock domains associated with the terminal.
  • the terminal determining the M clock domains associated with the terminal includes: during the session establishment process, the terminal obtains the clock domain numbers of the M clock domains associated with the terminal from the core network element, where the core The network element stores the association between the terminal identification and the clock domain numbers of the M clock domains; where the terminal identification includes one or more of the following: the terminal's GPSI, session-associated IP address, and terminal-associated at least one MAC address.
  • the terminal determining the M clock domains associated with the terminal includes: the terminal obtains clock domain numbers of the M clock domains associated with the terminal from the core network element, and the core network element includes the data management network element Or policy control network elements.
  • the core network element stores the association relationship between the subscription information of the terminal and the clock domain numbers of the M clock domains associated with the terminal, or the core network element stores the subscription information of the terminal and the subscription information includes the clocks of the M clock domains Domain number.
  • the terminal can determine the M clock domains associated with the terminal in many different ways.
  • the terminal and the access network device before the terminal receives the information of the M clock domains sent by the access network device, the terminal and the access network device perform timing advance measurement to obtain a timing advance value.
  • the timing advance value is used to determine the terminal and the access Transmission delay between network devices.
  • the terminal performs clock synchronization with the clock sources of the M clock domains according to the information of the M clock domains, including: for the ith clock domain of the M clock domains, the terminal according to the information of the ith clock domain And the timing advance value to determine the second time information of the i-th clock domain.
  • the second time information includes the time of the clock source of the i-th clock domain when the terminal receives the information of the i-th clock domain sent by the access network device. 1 to M.
  • the terminal can perform clock synchronization with clock sources of M clock domains, respectively, to achieve clock synchronization between the terminal and multiple clock sources.
  • the present application provides a method for determining a clock domain, which includes: a session management network element receives a session request message from a terminal; the session management network element sends an authentication authorization request message to an authentication authorization and charging device, and the authentication authorization request message includes Terminal identification; the session management network element receives the clock domain numbers of M clock domains sent by the authentication, authorization and accounting device.
  • the M clock domains are the clock domains associated with the terminal, and the clock domain numbers of the M clock domains are associated with the terminal identification Relationship; the session management network element sends clock domain numbers of M clock domains to the terminal; wherein, the terminal identifier includes one or more of the following: the terminal's GPSI, the session-associated IP address, and the terminal-associated at least one MAC address. Based on this method, the session management network element can obtain the clock domain number of the clock domain associated with the terminal from the authentication, authorization and charging device, and send the clock domain number to the terminal, so that the terminal can learn its own associated clock domain.
  • the present application provides a method for determining a clock domain, including: the data management network element obtains the subscription information of the terminal; the data management network element determines the clock domain numbers of the M clock domains associated with the terminal according to the terminal subscription information; The data management network element sends clock domain numbers of M clock domains to the terminal; wherein, the data management network element stores the association relationship between the subscription information of the terminal and the clock domain numbers of the M clock domains associated with the terminal, or, the data management network element
  • the contract information of the terminal is stored and the contract information includes clock domain numbers of M clock domains. Based on this method, the data management network element can obtain the clock domain number of the clock domain associated with the terminal, and send the clock domain number to the terminal, so that the terminal can learn its associated clock domain.
  • the present application provides a method for determining a clock domain, including: a policy control network element generates policy information, and the policy information includes clock domain numbers of M clock domains corresponding to applications contracted by the terminal; the policy control network element sends to the terminal Strategy information. Based on this method, the policy control network element can obtain the clock domain number of the clock domain associated with the terminal, and send the clock domain number to the terminal, so that the terminal can learn the clock domain associated with itself.
  • the policy information includes the clock domain numbers of the M clock domains corresponding to the applications that the terminal subscribes to; before the policy control network element generates the policy information, the terminal subscription information is obtained from the data storage network element, and the contract information includes The application of the terminal subscription; the policy control network element determines the clock domain numbers of the M clock domains corresponding to the application of the terminal subscription.
  • the present application provides a communication device, which has a function of implementing a terminal or an access network device in the above method embodiment.
  • This function can be realized by hardware, and can also be realized by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the communication device includes: a processor, a memory, a bus, and a communication interface; the memory stores computer-executed instructions, the processor and the memory are connected through the bus, and when the communication device is running, the The processor executes the computer-executed instructions stored in the memory to cause the communication device to execute the clock synchronization method in the first aspect to the third aspect, or any implementation manner of the first aspect to the third aspect.
  • the communication device may be a terminal, an access network device, or the like.
  • the communication device includes a processor, and the processor is coupled to a memory, the memory is used to store a program, and when the program is executed by the processor, the communication device is executed.
  • the communication device may also be a chip, such as a chip of a terminal, or a chip in an access network device, the chip includes a processing unit, and optionally, a storage unit, and the chip may be used for Perform the clock synchronization method as described in the first aspect to the third aspect, or any implementation manner of the first aspect to the third aspect.
  • the present application provides a communication device having a function of implementing a session management network element, a data management network element, or a policy control network element in the foregoing method embodiment.
  • This function can be realized by hardware, and can also be realized by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the communication device includes: a processor, a memory, a bus, and a communication interface; the memory stores computer-executed instructions, the processor and the memory are connected through the bus, and when the communication device is running, the The processor executes the computer-executed instructions stored in the memory to cause the communication device to execute the clock domain determination method in any of the fourth aspect to the sixth aspect, or any implementation manner of the fourth aspect to the sixth aspect.
  • the communication device may be a session management network element, a data management network element, or a policy control network element.
  • the communication device includes a processor, and the processor is coupled to a memory, the memory is used to store a program, and when the program is executed by the processor, the communication device is executed.
  • the communication device may also be a chip, such as a chip of a session management network element, or a chip of a data management network element, or a chip of a policy control network element.
  • the chip includes a processing unit, optionally And also includes a storage unit, and the chip may be used to execute the clock domain determination method in any of the fourth aspect to the sixth aspect, or any implementation manner of the fourth aspect to the sixth aspect.
  • the present application provides a storage medium on which a computer program or instruction is stored, and when executed, the computer program or instruction causes the computer to execute the first aspect to the third aspect or the first aspect to the third aspect as described above
  • a clock synchronization method in any implementation of the aspect is not limited to:
  • the present application provides a storage medium on which a computer program or instruction is stored, and when executed, the computer program or instruction causes the computer to execute the fourth aspect to the sixth aspect or the fourth aspect to the sixth aspect as described above
  • this application provides a computer program product.
  • the computer program product includes computer software instructions that can be loaded by a processor to implement the process in the clock synchronization method of any one of the first aspect to the third aspect.
  • this application provides a computer program product.
  • the computer program product includes computer software instructions, and the computer software instructions can be loaded by a processor to implement the flow in the method for determining a clock domain according to any one of the fourth aspect to the sixth aspect.
  • the present application provides a system including the terminal in the above first aspect or any implementation manner of the first aspect, and, the interface in the above second aspect or any implementation manner of the second aspect Network access equipment.
  • the present application provides a system including the terminal in the above third aspect or any implementation manner of the third aspect, and, the interface in the above second aspect or any implementation manner of the second aspect Network access equipment.
  • FIG. 1 is a schematic diagram of a possible network architecture provided by this application.
  • FIG. 2 is a schematic diagram of another possible network architecture provided by this application.
  • 3A is a flowchart of a clock synchronization method provided by this application.
  • 3B is a schematic diagram of the frequency of clock domain 1 and clock domain 2 provided by this application;
  • 3C is a schematic diagram of the local clock of the terminal and the local clock of the i-th clock domain provided by this application;
  • FIG. 5 is a flowchart of a method for determining a clock domain associated with a terminal provided by this application;
  • FIG. 6 is a flowchart of another method for determining a clock domain associated with a terminal provided by this application.
  • FIG. 7 is a flowchart of another method for determining a clock domain associated with a terminal provided by this application.
  • FIG. 8 is a schematic diagram of an apparatus provided by this application.
  • FIG. 9 is a schematic diagram of a terminal provided by this application.
  • FIG. 10 is a schematic diagram of an access network device provided by this application.
  • FIG. 11 is a schematic diagram of an apparatus provided by this application.
  • this is a schematic diagram of a possible network architecture to which this application is applicable, including an access network device and at least one terminal.
  • the terminal communicates with the access network device through the wireless interface.
  • K is a positive integer.
  • the terminal is a device with wireless transceiver function.
  • the terminal can be deployed on land, including indoor or outdoor, handheld or in-vehicle; it can also be deployed on the water (such as ships); it can also be deployed in the air (such as aircraft, balloons and Satellite first class).
  • the terminal may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, and an industrial control (industrial control) Wireless terminal in self-driving, wireless terminal in self-driving, wireless terminal in remote medical, wireless terminal in smart grid, wireless terminal in transportation safety,
  • the terminal can also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), and a wireless communication function Handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the 5th generation (5G) network in the future, or public land mobile communication networks that will evolve in the future (public land, mobile network, PLMN) terminal equipment, etc.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • Handheld devices computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the 5th generation (5G) network in the future, or public land mobile communication networks that will evolve in the future (public land, mobile network, PLMN) terminal equipment, etc.
  • 5G 5th generation
  • PLMN public land mobile communication networks
  • Terminals may sometimes be called terminal equipment, user equipment (UE), access terminal equipment, in-vehicle terminals, industrial control terminals, UE units, UE stations, mobile stations, mobile stations, remote stations, remote terminal equipment, mobile Equipment, UE terminal equipment, terminal equipment, wireless communication equipment, UE agents or UE devices, etc.
  • the terminal may also be fixed or mobile. The embodiments of the present application are not limited to this.
  • An access network device also known as a radio access network (radio access network, RAN) device, is a device that provides wireless communication functions for terminals.
  • Access network equipment includes, but is not limited to, 5G next-generation base stations (gNodeB, gNB), evolved node B (evolved node B, eNB), radio network controller (radio network controller, RNC), and node B ( node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (eg, home evolved node B, or home node B, HNB), baseband unit (baseBand unit) , BBU), transmitting point (transmitting and receiving point, TRP), transmitting point (transmitting point, TP), mobile switching center, etc.
  • 5G next-generation base stations gNodeB, gNB
  • evolved node B evolved node B
  • RNC radio network controller
  • RNC radio network controller
  • node B node B
  • BSC base station controller
  • BTS base
  • the access network device may also be a wireless controller, a centralized unit (CU), and / or a distributed unit (DU) in a cloud radio access network (CRAN) scenario, or this
  • the network device may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a future 5G network, or a network device in a future evolved PLMN network.
  • the terminal can communicate with multiple access network devices of different technologies. For example, the terminal can communicate with an access network device that supports long-term evolution (LTE) networks, and can also communicate with an access network device that supports 5G networks. It can also support dual connection with the access network equipment of LTE network and the access network equipment of 5G network.
  • LTE long-term evolution
  • 5G 5G network
  • the terminals in this application have different types in different application scenarios, which are described separately below.
  • Scenario 1 The terminal connected to the access network device serves as an end station, that is, no other device is connected to the terminal, and one terminal corresponds to one clock domain.
  • the terminal can synchronize the clock with the clock source of the corresponding clock domain through the access network device. As shown in FIG. 1, the terminal 1 can perform clock synchronization with a clock source in a clock domain.
  • Scenario 2 The terminal connected to the access network device is not connected to other devices, but the terminal includes multiple applications. One application can serve as an endpoint site, and one application corresponds to one clock domain.
  • an application of a terminal can perform clock synchronization with a clock source of a clock domain corresponding to the application. Therefore, a terminal supporting multiple applications can perform clock synchronization with clock sources of multiple clock domains through an access network device.
  • the terminal 2 includes T applications, and T is a positive integer.
  • One application corresponds to one clock domain, and clock sources in different clock domains may be the same or different. Therefore, the terminal 2 can perform clock synchronization with clock sources of at most T clock domains.
  • Scenario 3 The terminal connected to the access network device is connected to one or more other devices.
  • One device can serve as an endpoint site, one device corresponds to one clock domain, and the terminal can also correspond to one clock domain.
  • a device connected to a terminal can perform clock synchronization with a clock source in the clock domain corresponding to the device, and the terminal itself can also perform clock synchronization with a clock source in a clock domain. Therefore, one or more other devices are connected
  • a terminal of the device can synchronize clocks with clock sources in multiple clock domains through the access network device.
  • terminal 3 is connected to L devices, L is a positive integer, and one device corresponds to one clock domain, and the clock sources of different clock domains may be the same or different. Therefore, the terminal 3 can perform clock synchronization with clock sources of at most L + 1 clock domains.
  • a terminal needs to be externally connected to multiple industrial devices, such as industrial robots and robotic arms. Therefore, the terminal and the industrial equipment external to the terminal need to be synchronized with the clock source of the corresponding clock domain.
  • the synchronization of the terminal and the clock source of the clock domain may have different meanings in different application scenarios, for example, it can be understood that the application of the terminal synchronizes with the clock source of the clock domain, or understand The device connected to the terminal synchronizes with the clock source of the clock domain, or it can be understood that the terminal itself synchronizes with the clock source of the clock domain.
  • the clock source may also be called a main clock source. Therefore, the terminal performing clock synchronization with a clock source in one clock domain may also be referred to as a terminal performing clock synchronization with a clock domain, or may be referred to as a terminal performing clock synchronization with a main clock source within a clock domain.
  • FIG. 2 it is another schematic diagram of a possible network architecture applicable to this application.
  • the network architecture includes terminals, access network equipment, user plane network elements, mobility management network elements, session management network elements, policy control network elements, data storage network elements, data management network elements, and authentication, authorization, and accounting equipment.
  • the terminal and access network device shown in FIG. 2 may be the terminal and access network device shown in FIG. 1, and reference may be made to the related description in FIG. 1.
  • the user plane network element is mainly responsible for processing user packets, such as forwarding, charging, and lawful interception.
  • data can also be received.
  • the user plane network element may be a user plane function (UPF) network element.
  • UPF user plane function
  • future communications such as the 6th generation (6th generation, 6G) network
  • the user plane network element may still be a UPF network element. , Or have other names, this application is not limited.
  • the session management network element is mainly used for session management in a mobile network, such as session creation, modification, and release. Specific functions include, for example, allocating internet protocol (IP) addresses for users, selecting user plane network elements that provide packet forwarding functions, and generating forwarding rules, and delivering them to user plane network elements through signaling.
  • IP internet protocol
  • the session management network element may be a session management function (SMF) network element.
  • SMF session management function
  • future communications such as 6G networks, the session management network element may still be an SMF network element, or have another name.
  • the application is not limited.
  • Mobility management network element is mainly used for terminal registration, mobility management and tracking area update process in the mobile network.
  • the mobility management network element terminates non-access stratum (NAS) messages, completes registration management, connection management, and reachability management, assigns tracking area lists (track, area list, TA list), and mobility management, etc. And transparently route the session management (session management, SM) message to the session management network element.
  • NAS non-access stratum
  • the mobility management network element can be an access and mobility management (access and mobility management function, AMF) network element.
  • AMF access and mobility management function
  • future communications such as 6G networks, the mobility management network element can still be an AMF network element , Or have other names, this application does not limit.
  • the data management network element is mainly used to manage contracted data. When the contracted data is modified, it is responsible for notifying the corresponding network element.
  • the data management network element may be a unified data management (unified data management, UDM) network element.
  • UDM unified data management
  • future communications such as 6G, the data management network element may still be a UDM network element, or have another name. This application does not Be limited.
  • Policy control network element which includes user subscription information management function, policy control function, charging policy control function, quality of service (QoS) control, etc.
  • the policy control network element may be a policy control function (PCF) network element.
  • PCF policy control function
  • future communications such as 6G networks, the policy control network element may still be a PCF network element, or have other names. The application is not limited.
  • Authentication, authorization and charging equipment including authentication (Authentication), authorization (Authorization) and accounting (Accounting) and other functions, where the authentication function includes verifying the user's identity and available network services, the authorization function includes opening the network based on the authentication result Services are provided to users.
  • the billing function includes recording users' usage of various network services and providing them to the billing system.
  • the authentication, authorization and charging device may be located inside the 3GPP network or a third-party network, which is not limited in this application.
  • the authentication, authorization, and accounting device can be an authentication, authorization, and accounting (AAA) function network element.
  • AAA authentication, authorization, and accounting
  • future communications such as 6G networks, the authentication, authorization, and accounting device can still be an AAA network element, or Other names are not limited in this application.
  • Data storage network elements whose functions include storing and retrieving contract information, strategy data and public architecture data, etc., can be used by data management network elements and policy control network elements to obtain relevant data.
  • the data storage network element can have different data access authentication mechanisms for different types of data such as contract information and policy data to ensure the security of data access.
  • the data storage network element must be able to return a failure response with an appropriate cause value for illegal service operations or data access requests.
  • the data storage network element may be a unified data repository (unified data repository, UDR).
  • UDR unified data repository
  • future communications such as a 6G network, the database may still be UDR, or have another name, which is not limited in this application.
  • the above function may be a network element in a hardware device, or a software function running on dedicated hardware, or a virtualized function instantiated on a platform (for example, a cloud platform).
  • the terminal is a UE
  • the access network device is a base station
  • the user plane network element is a UPF network element
  • the session management network element is called an SMF network element
  • the mobility management network element is an AMF network element.
  • the control network element is a PCF network element
  • the data management network element is a UDM network element
  • the data storage network element is a UDR
  • the authentication, authorization and accounting device is an AAA network element.
  • the UPF network element is referred to as UPF
  • the session management network element is referred to as SMF
  • the AMF network element is referred to as AMF
  • the PCF network element is referred to as PCF
  • the UDM network element is referred to as UDM
  • the AAA network element is referred to as AAA. That is, the UPF described later in this application can be replaced by user plane network elements, SMF can be replaced by session management network elements, AMF can be replaced by mobility management network elements, UDM can be replaced by data management network elements, and UEs It can be replaced by a terminal, UDR can be replaced by a data storage network element, AAA can be replaced by an authentication, authorization and accounting device, and base stations can be replaced by access network devices.
  • one UE can only perform clock synchronization with a clock source in one clock domain.
  • a UE needs to perform clock synchronization with clock sources in multiple clock domains.
  • UE2 shown in FIG. 1 includes multiple applications, and each application needs to perform clock synchronization with a clock source in a clock domain. Therefore, a UE that supports multiple applications needs to perform clock synchronization with clock sources in multiple clock domains.
  • UE3 shown in FIG. 1 can be connected to multiple devices, and each device needs to be clock synchronized with a clock source of a clock domain, so a UE connected to multiple devices also needs to be synchronized with clock sources of multiple clock domains. Clock synchronization.
  • FIG. 3A it is a clock synchronization method provided by the present application.
  • the method can be used for clock synchronization between a UE and a clock source in one or more clock domains.
  • the method includes the following steps:
  • Step 301 the base station and the clock sources of the N clock domains of the data network respectively perform clock synchronization.
  • the N clock domains here can come from N different data networks, one data network corresponding to one clock domain.
  • the N clock domains may come from X different data networks (X is a positive integer less than N), and one data network corresponds to one or more clock domains. This application is not limited.
  • the data network here may be, for example, Time Sensitive Network (Time Sensitive Networking, TSN), or may be a packet data network, or may be an enterprise network, etc., which is not limited in this application.
  • the N clock domains here are part or all of the clock domains supported by the base station.
  • the clock domain corresponding to the data network includes the clock domain supported by the base station, or it is understood that the clock domain supported by the base station is the clock domain corresponding to the data network. Subset.
  • the base station can perform clock synchronization with part or all of the clock domains supported by itself, that is, the above-mentioned N clock domains.
  • the time system adopted by clock domain 1 and clock domain 2 are different.
  • the time system adopted by clock domain 1 is Coordinated Universal Time (UTC).
  • the starting point of UTC time is Universal Time (UT) in 1972. 0: 0: 0 on January 1st.
  • the time system adopted in clock domain 2 is Global Positioning System Time (Global Positioning System, GPS), that is, GPS atomic time, and its time base is at 0 o’clock on January 6, 1980, which is consistent with the world coordinated time. Cumulative time in seconds.
  • GPS time Global Positioning System Time
  • the difference between GPS time and UTC time is an integer multiple of seconds. For example, the difference between GPS time and UTC time in 1989 is 5 seconds, the difference between GPS time and UTC time in 1996 is 11 seconds, and the difference between GPS time and UTC time in 2002 is 13 seconds.
  • FIG. 3B it is a frequency diagram of clock domain 1 and clock domain 2.
  • the time units adopted by clock domain 1 and clock domain 2 are different, so that the frequencies of clock domain 1 and clock domain 2 are not synchronized.
  • Frequency synchronization means that different signals have the same number of pulses in the same time interval.
  • clock domain 1 thinks that 1 minute is equal to 60 pulse periods, that is, 1 pulse period is 1 second
  • clock domain 2 thinks that 1 minute is equal to 30 pulse periods, that is, 1 pulse period is 2 seconds, also That is to say, because the length of the second in the two clock domains is different, that is, the time scale is different, eventually as time accumulates, there will be a deviation between the two.
  • the absolute time 1 of the clock source 1 in the clock domain 1 and the absolute time 2 of the clock source 2 in the clock domain 2 may be different.
  • the base station can learn the absolute time of each clock source. For example, for the current moment, the base station may learn that the absolute time corresponding to clock source 1 of clock domain 1 is T1, and the absolute time corresponding to clock source 2 of clock domain 2 is T2.
  • the base station After the base station and the clock domains of the N clock domains respectively perform clock synchronization, the base station will be triggered to send information of each clock domain to the UE, or it may be understood that the base station will be triggered to notify the UE to perform clock synchronization with the clock source.
  • Step 302 The base station sends N clock domain information to the UE connected to the base station.
  • the UE can receive the information of the N clock domains.
  • N is an integer greater than 1.
  • the base station may send the information of the N clock domains to all UEs connected to the base station, for example, send the information of the N clock domains to all UEs connected to the base station in a broadcast manner.
  • the base station can also send the information of the N clock domains to some UEs connected to the base station (such as UEs in a certain cell), for example, to some UEs connected to the base station by multicast or broadcast Send the information of the N clock domains.
  • the clock domain information here includes the first time information and clock domain number of the clock domain, where the clock domain number is used to identify the clock domain, and the first time information includes the clock of the clock domain when the base station sends the information of the clock domain Source time.
  • the time of the clock source of the clock domain included in the first time information herein is timed according to the time unit of the clock source, that is, the time of the clock source of the clock domain included in the first time information is the The absolute time of the clock source.
  • the base station sends two clock domain information to the UE, where:
  • the information in the first clock domain includes: T1, Number-1,
  • the information in the second clock domain includes: T2, Number-2.
  • T1 is the first time information of the first clock domain, that is, the time of the clock source of the first clock domain when the base station sends the information of the first clock domain to the UE
  • Number-1 is the clock domain number of the first clock domain
  • T2 is the first time information of the second clock domain, that is, the time of the clock source of the second clock domain when the base station sends the information of the second clock domain to the UE
  • Number-2 is the clock domain number of the second clock domain.
  • the information in a clock domain also includes a frequency deviation value ratio between the local clock of the base station and the clock source in the clock domain.
  • the frequency deviation value ratio can be used to indicate the cognitive difference of the time unit between the local clock of the base station and the clock source.
  • the local clock of the base station thinks that 1 minute is equal to 60 pulse periods, that is, one pulse period is 1 second
  • the clock source of the first clock domain thinks that 1 minute is equal to 60 pulse periods, then the local clock of the base station and the first clock domain
  • the ratio of frequency deviation values between the clock sources is 1.
  • the local clock of the base station thinks that 1 minute is equal to 30 pulse periods, that is, one pulse period is 2 seconds, and the clock source of the second clock domain thinks that 1 minute is equal to 60 pulse periods.
  • the ratio of frequency deviation values between clock sources in the domain is 2.
  • the information of the two clock domains may be, for example:
  • the information in the first clock domain includes: T1, Number-1, FrequencyRateRatio1,
  • the information in the second clock domain includes: T2, Number-2, FrequencyRateRatio2,
  • FrequencyRateRatio1 is the ratio of the frequency deviation value between the local clock of the base station and the clock source in the first clock domain
  • FrequencyRateRatio2 is the ratio of the frequency deviation value between the local clock of the base station and the clock source in the second clock domain.
  • the information in the first clock domain includes: T1, Number-1,
  • the information of the second clock domain includes: T2, Number-2, FrequencyRateRatio2.
  • the base station may send the clock domain information to the UE through at least three different implementation methods below.
  • Implementation method 1 The base station sends broadcast information so that the UE can receive the broadcast information, and the broadcast information includes information of N clock domains.
  • the broadcast information here may be a broadcast message, for example, it may be extended based on a system information block 16 (System Information Block 16, SIB16) message, and the SIB16 message includes information of N clock domains. Then broadcast SIB16.
  • SIB16 System Information Block 16, SIB16
  • the broadcast message may include:
  • Implementation method 2 The base station sends unicast information to the UE, and the unicast information includes information of N clock domains.
  • the base station sends unicast information to the UE that needs clock synchronization.
  • the unicast information may specifically be a unicast message, so that the UE can receive the unicast information, and the unicast information includes N clock domains. information.
  • the unicast information here may be, for example, a unicast message in a specific implementation. Specifically, the unicast message may be expanded based on the unicast message. The unicast message includes information of N clock domains, and then send the Broadcast message.
  • the unicast message may include:
  • the base station sends N unicast information to the UE, and one unicast information includes information of one clock domain among the N clock domains.
  • the base station sends N clock domain information to the same UE through N unicasts respectively, and one unicast information includes information of one clock domain.
  • the first unicast information carries information of the first clock domain
  • the second unicast information carries information of the second clock domain, and so on.
  • the unicast message 1 may include:
  • Unicast message 2 may include:
  • Unicast message 3 may include:
  • Number-1 is the clock domain number of the first clock domain
  • T1 is the first time information of the first clock domain, that is, the base station sends the first time to the UE
  • the information in the clock domain is the time of the clock source in the first clock domain
  • FrequencyRateRatio1 is the ratio of the frequency deviation value between the local clock of the base station and the clock source in the first clock domain.
  • Number-2 is the clock domain number of the second clock domain
  • T2 is the first time information of the second clock domain, that is, the time of the clock source of the second clock domain when the base station sends the information of the second clock domain to the UE
  • FrequencyRateRatio2 It is the ratio of the frequency deviation value between the local clock of the base station and the clock source of the second clock domain.
  • Number-3 is the clock domain number of the third clock domain
  • T3 is the first time information of the third clock domain, that is, the time of the clock source of the third clock domain when the base station sends the information of the third clock domain to the UE
  • FrequencyRateRatio3 It is the ratio of the frequency deviation value between the local clock of the base station and the clock source of the third clock domain.
  • step 303 the UE determines M clock domains associated with the UE in N clock domains, where M is a positive integer.
  • the UE After receiving the information of the N clock domains sent by the base station, the UE determines M clock domains associated with the UE from the N clock domains.
  • the M clock domains associated with the UE have different meanings for different UEs.
  • the M clock domains associated with the UE refer to the M clock domains associated with the M applications in the UE, one for each application Clock domain, that is, an application can perform clock synchronization with a clock source in a clock domain.
  • the M clock domains associated with the UE refer to a clock domain associated with the UE itself and M-1 devices connected to the UE respectively M-1 associated clock domains, where one device is associated with one clock domain, and the UE is also associated with one clock domain.
  • step 304 the UE synchronizes clocks with M clock domain clock sources according to the information of M clock domains.
  • the UE can perform clock synchronization with the clock source of the clock domain for each clock domain in the M clock domains.
  • an implementation method of clock synchronization between a UE and a clock source in a clock domain is given below.
  • the UE and the base station's local clock synchronize clocks, and the UE and the base station also perform timing advance measurement to obtain a timing advance value (Timing Advance), which is used to determine Transmission delay between the UE and the base station.
  • Timing Advance a timing advance value
  • the base station determines the timing advance value by measuring the preamble sequence received from the UE. It should be noted that the timing advance value is calculated based on the time unit of the local clock of the base station. It can be understood that, through timing advance measurement, the local clock of the UE and the local clock of the base station achieve frequency synchronization.
  • the UE and the base station maintain clock synchronization and the UE obtains the timing advance value
  • the UE receives the information of N clock domains sent by the base station and determines the M clock domains associated with the UE
  • the UE The M clock domains respectively perform clock synchronization of clock sources.
  • the UE determines the second time information of the i-th clock domain according to the information of the i-th clock domain and the timing advance value.
  • the second time information includes the UE receiving the i-th clock sent by the base station.
  • the information of the domain is the time of the clock source of the i-th clock domain, i is taken from 1 to M. It should be noted that the time of the clock source of the clock domain included in the second time information herein is the absolute time of the clock source.
  • the second time information of the i-th clock domain first time information of the i-th clock domain + TA / 2 * FrequencyRateRatioi, where the first time information of the i-th clock domain is included in the information of the i-th clock domain
  • the first time information, TA is the timing advance value, considering the downlink transmission delay, the base station and the UE have an error in the recognition of the reference frame boundary, the downlink transmission delay between the base station and the UE can be approximately equal to TA / 2
  • FrequencyRateRatio i is the ratio of the frequency deviation value between the local clock of the base station and the clock source of the i-th clock domain.
  • FrequencyRateRatioi is the downlink transmission delay between the base station and the UE in terms of the time unit of the clock source in the i-th clock domain. Since the first time information in the i-th clock domain is the base station sending the i-th clock domain to the UE Is the time of the clock source in the i-th clock domain, so the first time information in the i-th clock domain + TA / 2 * FrequencyRateRatio i is the time of the clock source in the i-th clock domain when the UE receives the information in the i-th clock domain .
  • the UE can calculate the absolute time of the local clock of the clock domain at any time according to the second time information to achieve clock synchronization with the clock source of the clock domain. Or, it can be understood that the UE calculates other absolute times before and after the absolute time according to the absolute time represented by the second time information in the clock domain, to achieve clock synchronization with the clock source in the clock domain.
  • the base station synchronizes clocks with the clock source of the clock domain in step 302, and the base station sends N clock domain information to the UE through broadcast information
  • the first time information included in may be the time of the end of the frame of the frame where the system information window (SI-Window) where the broadcast message is located, and the time of the end of the frame corresponds to the absolute time of the clock source of the clock domain.
  • SI-Window system information window
  • the UE obtains FrequencyRateRatioi, which is the ratio of the frequency deviation value between the local clock of the base station and the clock source in the i-th clock domain. Since the local clock of the UE has been synchronized with the local clock of the base station, Therefore, the UE can obtain the frequency deviation value ratio between the local clock of the UE and the clock source of the i-th clock domain according to FrequencyRateRatio.
  • FrequencyRateRatioUE can be used to indicate the frequency deviation between the local clock of the UE and the clock source of the i-th clock domain. Value ratio, where FrequencyRateRatioUEi and FrequencyRateRatioi are equal.
  • the information obtained by the UE is:
  • the second time information in the i-th clock domain that is, the absolute time of the local clock in the i-th clock domain
  • FrequencyRateRatioUE that is, the ratio of the frequency deviation value between the local clock of the UE and the clock source of the i-th clock domain.
  • the UE can calculate the absolute time of the local clock in the clock domain at any time according to the second time information in the i-th clock domain, so clock synchronization is maintained between the UE and the clock source.
  • the base station if the base station synchronizes clocks with the clock source of the clock domain in step 302, the base station sends N clock domain information to the UE through unicast information.
  • the information may also include a reference frame number, then the first time information included in the information of a clock domain may be the time recorded by the clock source of the clock domain for the frame end boundary of the reference frame indicated by the reference frame number, the The time at the end of the frame boundary corresponds to the absolute time of the clock source in the clock domain.
  • the UE obtains the absolute time of the clock domain.
  • the UE can calculate the absolute time of the local clock in the clock domain at any time according to the second time information in the i-th clock domain, so clock synchronization is maintained between the UE and the clock source.
  • this application provides a schematic diagram of the local clock variation of the UE's local clock and the i-th clock domain, where the UE can calculate the FrequencyRateRatioUEi, which is the source of the UE's local clock and the clock source of the i-th clock domain.
  • the ratio of the frequency deviation between For example, based on the above method, when synchronizing the UE with the i-th clock source, the local clock in the i-th clock domain is T1, and the UE can calculate that the local clock in the i-th clock domain is T1, and when the local clock in the i-th clock domain is When the clock source is T1, the UE's local clock is T2.
  • the UE can calculate the local clock of the i-th clock source according to the local clock of the UE at any time.
  • synchronization between the UE and the clock source of the i-th clock domain is achieved.
  • T3 the local clock of the UE
  • T4-T1 FrequencyRateRatioUEi
  • the UE can calculate the local clock T4 in the i-th clock domain according to any time T3 after the local clock T2 of the UE, that is, clock synchronization between the UE and the clock source in the i-th clock domain is achieved.
  • clock synchronization between a UE and multiple clock domain clock sources associated with the UE is implemented, which improves the efficiency of UE clock synchronization.
  • the method can be used for clock synchronization between a UE and a clock source in one or more clock domains.
  • the method includes the following steps:
  • Step 401 the base station and the clock sources of the N clock domains of the data network respectively perform clock synchronization.
  • This step is the same as step 301 in the embodiment shown in FIG. 3A, and reference may be made to the foregoing description, which will not be repeated here.
  • step 401 of this embodiment after the base station synchronizes the clock source with the clock source of the clock domain of the data network, it does not trigger the base station to actively send N clock domain information to the UE.
  • step 402 the UE determines the associated M clock domains, where M is a positive integer.
  • step 303 is the same as step 303 in the embodiment shown in FIG. 3A, and reference may be made to the foregoing, which will not be repeated here.
  • the UE may be triggered to perform this step 402 and subsequent steps.
  • Step 403 The UE sends the clock domain numbers of the M clock domains associated with the UE to the base station.
  • the UE may send a request message to the base station, where the request message includes clock domain numbers of the M clock domains associated with the UE, and the request message is used to request information about the M clock domains.
  • step 404 the base station sends M clock domain information corresponding to the M clock domain numbers to the UE.
  • the UE can receive the information of the M clock domains.
  • the base station can obtain the information of N clock domains through the above step 401 and store it locally.
  • the information of the N clock domains includes the information of the M clock domains requested by the UE.
  • the information of the M clock domains corresponding to the M clock domain numbers is sent to the UE.
  • Step 405 the UE synchronizes clocks with M clock domain clock sources according to the information of M clock domains, respectively.
  • step 304 is the same as the specific implementation method of step 304 above, and reference may be made to the foregoing description.
  • clock synchronization between a UE and multiple clock domain clock sources associated with the UE is implemented, which improves the efficiency of UE clock synchronization.
  • the base station sends the UE the clock domain information requested by the UE based on the request of the UE .
  • the base station sends part or all of the clock domain information it supports to the UE, and then the UE determines the clock domain information associated with it from the UE.
  • the corresponding execution method can be selected according to actual needs.
  • step 402 and step 403 of the embodiment shown in FIG. 4 may also be replaced with step A and step B below.
  • Step A The core network element determines the clock domain numbers of the M clock domains associated with the UE.
  • the core network element (such as SMF, PCF, UDM, etc.) obtains the clock domain numbers of the M clock domains associated with the UE through the method of any one of the following embodiments in FIG. 5 to FIG. 7.
  • Step B The core network element sends the clock domain numbers of the M clock domains associated with the UE to the base station through AMF.
  • the core network element After obtaining the clock domain numbers of the M clock domains associated with the UE, the core network element sends the clock domain numbers of the M clock domains associated with the UE to the base station through the AMF, thereby triggering the base station to send the M clock domains associated with the UE to the UE Information, which in turn causes the UE to perform clock synchronization.
  • the core network element triggers the base station to send the clock domain information of the M clock domains associated with the UE to the UE, thereby enabling the UE to perform clock synchronization.
  • Implementation method 1 In the process of establishing a session, the UE obtains M clock domains associated with the UE from the core network element, wherein the core network element stores the association relationship between the UE identifier and the clock domain numbers of the M clock domains.
  • the identifier of the UE includes one or more of the following: a generic public subscription identifier (Generic, Public Subscription, GPSI) of the UE, an IP address associated with the session, and at least one medium access control (MAC) associated with the UE address.
  • the core network element here can be AAA or SMF.
  • the UE sends a session request message to the SMF, and the SMF sends an authentication and authorization request message to the AAA.
  • the authentication and authorization request message includes the identifier of the UE, and then the AAA obtains clocks of M clock domains corresponding to the identifier of the UE Domain number.
  • AAA sends the clock domain numbers of M clock domains to SMF.
  • the SMF sends the signal clock domain numbers of M clock domains to the UE. Therefore, the UE can obtain the clock domain numbers of the M clock domains associated with the UE.
  • FIG. 5 A specific implementation process of this implementation method is given below in conjunction with FIG. 5. As shown in FIG. 5, it is a method for determining a clock domain associated with a terminal provided by this application.
  • the AAA of the external network is configured with a clock domain number of a clock domain corresponding to different UE identifiers.
  • the identifier of the UE may be, for example, one or more of IP address, MAC address, and GPSI.
  • the information configured on AAA can be shown in Table 1.
  • the clock domain number corresponding to the MAC address segment can also be configured on AAA.
  • a MAC address segment includes multiple MAC addresses, and the information configured on AAA may be as shown in Table 2.
  • the method shown in Figure 5 includes the following steps:
  • Step 501 The UE initiates a protocol data unit (protocol data unit, PDU) session establishment request.
  • protocol data unit protocol data unit
  • the PDU session establishment request carries the PDU session identifier, single network slice selection auxiliary information (single network selection selection information, S-NSSAI), data network name (Data Network Name, DNN), and session management (session management) , SM) PDU, DN, Request, Container and other parameters, among which SM PDU, DN, Request, Container are used to authenticate PDU sessions with external networks.
  • single network slice selection auxiliary information single network selection selection information, S-NSSAI
  • data network name Data Network Name, DNN
  • session management session management
  • step 502 the AMF sends a session context creation request to the SMF.
  • AMF After receiving the UE's PDU session establishment request, AMF selects SMF and sends a session context creation request to SMF. For example, by calling SMF's Nsmf_PDUSession_CreateSMContextRequest service operation, SMF is requested to create a session context for the UE.
  • Step 503 the SMF sends an authentication / authorization (Authentication / Authorization) request message to the AAA.
  • authentication / authorization Authentication / Authorization
  • the request message may carry the SMPDU, DN, Request, Container, and the GPSI of the UE, where the SMPDU, DN, Request, and Container may include the PDU session identifier.
  • AAA performs the authentication / authorization process for establishing a PDU session. If the authentication is successful, AAA determines the clock domain numbers of the M clock domains associated with the UE according to the UE's identification.
  • AAA may determine the MAC address corresponding to the UE according to the GPSI of the UE, and then search through the above Table 1 or Table 2 to obtain the clock domain number corresponding to the MAC address.
  • the MAC address corresponding to the UE here has different meanings in different application scenarios.
  • a UE is not associated with other devices and the UE corresponds to a clock domain
  • the MAC address corresponding to the UE here refers to the MAC address of the UE, so the UE can
  • the AAA obtains the clock domain number of the clock domain corresponding to the UE itself.
  • a UE is associated with other devices, where the MAC address corresponding to the UE refers to the MAC address of the UE and the MAC addresses of other devices associated with the UE, so The UE may obtain the clock domain number of the clock domain corresponding to the UE itself from AAA, and the clock domain number of the corresponding clock domain of other devices associated with the UE.
  • step 505 the AAA sends an authentication / authorization response message to the SMF, where the response message carries the clock domain numbers of the M clock domains associated with the UE.
  • Step 506 The SMF sends the clock domain numbers of the M clock domains associated with the UE to the AMF.
  • the SMF can send the clock domain numbers of the M clock domains associated with the UE to the AMF through the Namf_Communication_N1N2MessageTransfer message.
  • step 507 the AMF sends a PDU session establishment response message to the UE, where the response message includes clock domain numbers of M clock domains associated with the UE.
  • the UE can obtain the clock domain numbers of the M clock domains associated with the UE from the AAA or SMF in the session establishment process.
  • AAA may also store the correspondence between the IP address and the clock domain number of the clock domain, so that AAA may send the clock domain number of the clock domain corresponding to the IP to the UE according to the IP of the session requested by the UE to establish the session.
  • AAA stores the correspondence between the GPSI and the clock domain number of the clock domain, so that AAA can send the clock domain number of the clock domain corresponding to the GPSI to the UE according to the GPSI of the UE.
  • Implementation method 2 The UE obtains the M clock domains associated with the UE from the core network element, where the core network element stores the association relationship between the subscription information of the UE and the clock domain numbers of the M clock domains associated with the UE, or ,
  • the core network element stores UE subscription information and the subscription information includes clock domain numbers of M clock domains, and the core network element includes UDM or PCF.
  • the UDM stores the association between the UE's subscription information and the clock domain numbers of the M clock domains associated with the UE, or the UDM stores the UE's subscription information and the subscription information includes M clock domains Clock domain number.
  • the UDM obtains the subscription information of the UE, then determines the clock domain numbers of the M clock domains associated with the UE according to the subscription information of the UE, and then sends the clock domain numbers of the M clock domains to the UE.
  • FIG. 6 it is a method for determining a clock domain associated with a terminal provided by this application.
  • the method can be applied to scenario 1 of the embodiment shown in FIG. 1, the network management system (Operation, Administration and Maintenance, OAM) can pre-determine the clock domain to which the UE belongs based on the device type of the UE , And then generate the clock domain number for the UE and store it in the UDM.
  • the subscription information of the UE may be stored in the UDM and the subscription information of the UE includes the clock domain number, or the association relationship between the subscription information of the UE and the clock domain number may be stored in the UDM.
  • OAM can determine the clock domain to which the UE belongs in advance according to the device type of the UE and the device type of the device connected to the UE And determine the clock domain to which the device connected to the UE belongs, and then generate a clock domain number for the UE and a clock domain number for the device connected to the UE, and store it in the UDM.
  • the subscription information of the UE may be stored in the UDM and the subscription information of the UE includes the clock domain number to which the UE belongs and the clock domain number of the device to which the UE is connected, or the subscription information of the UE may be stored in the UDM.
  • the embodiment shown in FIG. 6 includes the following method steps:
  • step 601 the UE initiates a registration process and sends a registration request message to the AMF.
  • the message carries the UE's identity.
  • Step 602 refer to other steps in the registration process.
  • the AMF can initiate a security process to perform authentication on the UE.
  • a security process to perform authentication on the UE.
  • step 603 the AMF calls the UDM Nudm_SDM_get service operation, requesting to obtain the UE's subscription information.
  • the AMF may also call the UDM's Nudm_UECM_Registration service operation to trigger the UDM to store the association relationship between the AMF ID and the UE ID.
  • Step 604 The UDM returns the clock domain numbers of the M clock domains associated with the UE to the AMF through a Nudm_SDM_get response (ACK).
  • ACK Nudm_SDM_get response
  • step 604 may be specifically implemented as follows: the UDM sends the UE's subscription information to the AMF and Clock domain numbers of the M clock domains associated with the UE.
  • step 604 may be specifically implemented as follows: UDM sends the UE subscription information to the AMF, and the subscription The information includes clock domain numbers of M clock domains associated with the UE.
  • Step 605 The AMF obtains clock domain numbers of the M clock domains associated with the UE.
  • step 606 the AMF sends a registration acceptance message to the UE, where the message carries the clock domain numbers of the M clock domains associated with the UE.
  • the UE can obtain the clock domain numbers of the M clock domains associated with the UE from the UDM.
  • the PCF may obtain the UE's subscription information from the UDR.
  • the subscription information includes the UE's contracted application, and the PCF determines the clock domain numbers of the M clock domains corresponding to the UE's contracted application.
  • the PCF generates policy information, and the policy information includes the clock domain numbers of the M clock domains corresponding to the applications contracted by the UE.
  • the PCF sends policy information to the UE.
  • association relationship between the UE-signed application stored in the UDR and the clock domain number of the clock domain may be as shown in Table 3.
  • FIG. 7 it is a method for determining a clock domain associated with a terminal provided by this application. This method can be applied to scenario 2 of the embodiment shown in FIG. 1, that is, the UE includes M applications, and one application is associated with one clock domain.
  • the method includes the following steps:
  • Step 701 the UE initiates a registration process and sends a registration request message to the AMF.
  • the message carries the UE's identity.
  • Step 702 refer to other steps in the registration process.
  • the AMF can initiate a security process to perform authentication on the UE.
  • a security process to perform authentication on the UE.
  • Step 703 if the AMF does not store the access and mobility management policies related to the UE locally, the AMF executes the access and mobility policy association establishment (AM Policy) Establishment process, and the AMF calls the PCF ’s Npcf_AMPolicyControl_Create service operation to carry the UE Information such as the SUPI, the contract notification indication, and the UE ’s external identifier (GPSI).
  • AMF access and mobility policy association establishment
  • GSSI external identifier
  • This step is optional.
  • Step 704 the PCF calls the UDR's Nudr_DM_Query service operation (with SUPI), and the UDR returns the application information contracted by the UE, as well as the policy data (Policy Data), UE context policy control data (UE context policy control data), etc. to the PCF.
  • Policy Data Policy Data
  • UE context policy control data UE context policy control data
  • step 705 the PCF generates policy information for the UE, and the policy information includes clock domain numbers of M clock domains corresponding to applications to which the UE subscribes.
  • the applications contracted by the UE are Application-1 and Application-3.
  • the PCF can determine that the clock domain numbers corresponding to Application-1 and Application-3 are Number-1 and Number-2, respectively.
  • step 706 the PCF invokes the Npcf_AMPolicyControl_response service operation to send policy information to the AMF, where the policy information includes clock domain numbers of M clock domains corresponding to applications contracted by the UE.
  • the AMF sends a registration acceptance message to the UE, where the registration acceptance message includes policy information, and the policy information includes clock domain numbers of M clock domains corresponding to applications to which the UE subscribes.
  • the PCF generates policy information for the UE, and the UE determines the clock domain numbers of the M clock domains corresponding to the applications to which the UE subscribes through the policy information.
  • each network element described above includes a hardware structure and / or a software module corresponding to performing each function.
  • the present invention can be implemented in the form of hardware or a combination of hardware and computer software in combination with the units and algorithm steps of the examples described in the embodiments disclosed herein. Whether a function is executed by hardware or computer software driven hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.
  • FIG. 8 shows a possible exemplary block diagram of the device involved in the embodiment of the present invention.
  • the device 800 may exist in the form of software, hardware, or It exists in the form of software and hardware, and the embodiments of the present application are not limited.
  • the device 800 may include a processing unit 802 and a communication unit 803.
  • the communication unit 803 may include a receiving unit and / or a sending unit.
  • the processing unit 802 is used to control and manage the device 800.
  • the communication unit 803 is used to support communication between the device 800 and other network entities.
  • the device 800 may further include a storage unit 801 for storing the program code and data of the device 800.
  • the processing unit 802 may be a processor or a controller, such as a general-purpose central processing unit (CPU), general-purpose processor, digital signal processing (DSP), application-specific integrated circuit (application-specific integrated) circuits, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logical blocks, modules, and circuits described in conjunction with the disclosure of the embodiments of the present invention.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, DSP and microprocessor combinations, and so on.
  • the communication unit 803 may be a communication interface, a transceiver, or a transceiver circuit, etc., where the communication interface is collectively referred to, and in a specific implementation, the communication interface may include multiple interfaces.
  • the storage unit 801 may be a memory.
  • the apparatus 800 may be the access network device in any of the foregoing embodiments, or may be a chip in the access network device.
  • the processing unit 802 may be, for example, a processor, and the communication unit may be, for example, a transceiver, the transceiver includes a radio frequency circuit, and optionally, the storage unit may be, for example, a memory.
  • the processing unit 802 may be, for example, a processor, and the communication unit may be, for example, an input / output interface, a pin, or a circuit.
  • the processing unit 802 can execute computer-executed instructions stored in the storage unit.
  • the storage unit is a storage unit in the chip, such as a register, a cache, etc.
  • the storage unit may also be located in the access network device.
  • the storage unit outside the chip such as read-only memory (read-only memory, ROM) or other types of static storage devices that can store static information and instructions, random access memory (random access memory, RAM), etc.
  • the communication unit 803 includes a sending unit and a receiving unit: a processing unit for clock synchronization with clock sources of N clock domains; a sending unit for clock synchronization with clock sources of the N clock domains After completion, send information of N clock domains to the terminal.
  • the information of one clock domain includes the first time information and clock domain number of the clock domain.
  • the first time information includes the clock domain clock when the access network device sends the information of the clock domain.
  • the time of the source, the clock domain number is used to identify the clock domain, and N is an integer greater than 1.
  • the information in the clock domain further includes a frequency deviation value ratio between the local clock of the access network device and the clock source in the clock domain.
  • the sending unit is specifically configured to: send broadcast information, the broadcast information includes information of N clock domains; or, send unicast information to the terminal, and the unicast information includes information of N clock domains; Alternatively, N unicast information is sent to the terminal, and one unicast information includes information of one clock domain among the N clock domains.
  • the receiving unit is configured to receive the clock domain numbers of the N clock domains sent by the terminal or the core network element before the sending unit sends the information of the N clock domains to the terminal.
  • the device 800 may be the terminal in any of the foregoing embodiments, or may be a chip in the terminal.
  • the processing unit 802 may be, for example, a processor
  • the communication unit may be, for example, a transceiver, which includes a radio frequency circuit
  • the storage unit may be, for example, a memory.
  • the processing unit 802 may be, for example, a processor
  • the communication unit may be, for example, an input / output interface, a pin, or a circuit.
  • the storage unit is a storage unit within the chip, such as a register, a cache, etc.
  • the storage unit may also be a storage unit located outside the chip within the terminal, such as a ROM or other device that can store static information and instructions Types of static storage devices, RAM, etc.
  • the receiving unit is configured to receive information of N clock domains sent by the access network device, and the information of one clock domain includes the clock domain
  • the first time information and the clock domain number the first time information includes the time of the clock source of the clock domain when the access network device sends the clock domain information, the clock domain number is used to identify the clock domain, and N is an integer greater than 1;
  • the unit is used to determine M clock domains associated with devices in the N clock domains, where M is a positive integer; and, according to the information of the M clock domains, perform clock synchronization with the clock sources of the M clock domains, respectively.
  • the information in the clock domain further includes a frequency deviation value ratio between the local clock of the access network device and the clock source in the clock domain.
  • the receiving unit is specifically configured to: receive broadcast information sent by the access network device, and the broadcast information includes information of N clock domains; or, receive unicast information sent by the access network device, single The broadcast information includes information of N clock domains; or, receives N unicast information sent by the access network device, and one unicast information includes information of one clock domain among the N clock domains.
  • the processing unit is configured to determine the M clock domains associated with the terminal in the N clock domains, which specifically includes: acquiring M terminal associations from the core network element during the session establishment process Clock domain number of the clock domain, where the core network element stores the association relationship between the terminal identifier and the clock domain numbers of the M clock domains; where the terminal identifier includes one or more of the following: terminal GPSI, session association IP address and at least the MAC address associated with the terminal.
  • the processing unit is configured to determine the M clock domains associated with the terminal in the N clock domains, specifically including: acquiring the clock domain numbers of the M clock domains associated with the terminal from the core network element,
  • the core network element includes a data management network element or a policy control network element; wherein, the core network element stores the association relationship between the subscription information of the terminal and the clock domain numbers of the M clock domains associated with the terminal, or the core network element stores There is contract information of the terminal and the contract information includes clock domain numbers of M clock domains.
  • the processing unit is further used to perform timing advance measurement with the access network device before the receiving unit receives the information of the N clock domains sent by the access network device to obtain the timing advance, and the timing advance It is the transmission delay between the terminal and the access network equipment.
  • the processing unit is configured to perform clock synchronization with the clock sources of the M clock domains according to the information of the M clock domains, and specifically includes: for the i-th clock domain of the M clock domains, according to the i Clock domain information and timing advance to determine the second time information of the i-th clock domain, the second time information includes the time of the clock source of the i-th clock domain when the terminal receives the information of the i-th clock domain sent by the access network device, i Take 1 to M.
  • the sending unit is used to send the clock domain numbers of the M clock domains associated with the terminal to the access network device, M is a positive integer; the receiving unit is used to receive the The information of M clock domains corresponding to each clock domain number.
  • the information of one clock domain includes the first time information of the clock domain and the clock domain number.
  • the first time information includes the clock domain clock when the access network device sends the information of the clock domain.
  • the time of the source, the clock domain number is used to identify the clock domain, and N is an integer greater than 1;
  • the processing unit is used to synchronize clocks with the clock sources of the M clock domains according to the information of the M clock domains.
  • the information in the clock domain further includes a frequency deviation value ratio between the local clock of the access network device and the clock source in the clock domain.
  • the receiving unit is specifically configured to: receive broadcast information sent by the access network device, and the broadcast information includes information of M clock domains; or, receive unicast information sent by the access network device, single The broadcast information includes information of M clock domains; or, receives M unicast information sent by the access network device, and one unicast information includes information of one clock domain among the M clock domains.
  • the processing unit is further configured to determine the M clock domains associated with the terminal before the sending unit sends the clock domain numbers of the M clock domains associated with the terminal to the access network device.
  • the processing unit is configured to determine the M clock domains associated with the terminal, specifically including: during the session establishment process, obtain the clock domain numbers of the M clock domains associated with the terminal from the core network element , Where the core network element stores the association relationship between the terminal ID and the clock domain numbers of the M clock domains; where the terminal ID includes one or more of the following: the terminal ’s GPSI, session-associated IP address, and terminal association At least one MAC address.
  • the processing unit is configured to determine the M clock domains associated with the terminal, specifically including: acquiring the clock domain numbers of the M clock domains associated with the terminal from the core network element, the core network element including data Management network element or policy control network element; wherein the core network element stores the association between the terminal subscription information and the clock domain numbers of the M clock domains associated with the terminal, or the core network element stores the terminal subscription information and The subscription information includes clock domain numbers of M clock domains.
  • the processing unit is further used to perform timing advance measurement with the access network device before the receiving unit receives the information of the M clock domains sent by the access network device, to obtain timing advance, which is used for timing advance It is used to determine the transmission delay between the terminal and the access network device.
  • the processing unit is configured to perform clock synchronization with the clock sources of the M clock domains according to the information of the M clock domains, and specifically includes: for the i-th clock domain of the M clock domains, according to the i Clock domain information and timing advance, to determine the second time information of the i-th clock domain, the second time information includes the time of the clock source of the i-th clock domain when the terminal receives the information of the i-th clock domain sent by the access network device, i takes 1 to M.
  • the device 800 may be the session management network element in any of the foregoing embodiments, or may be a chip in the session management network element.
  • the processing unit 802 may be, for example, a processor
  • the communication unit may be, for example, a transceiver.
  • the transceiver includes a radio frequency circuit
  • the storage unit may be, for example, a memory.
  • the processing unit 802 may be, for example, a processor
  • the communication unit may be, for example, an input / output interface, a pin, or a circuit.
  • the storage unit is a storage unit within the chip, such as a register, a cache, etc.
  • the storage unit may also be a storage unit located outside the chip within the session management network element, such as a ROM or a device that can store static information and Instruction of other types of static storage devices, RAM, etc.
  • the communication unit 803 includes a sending unit and a receiving unit: the receiving unit is used to receive a session request message from the terminal; the sending unit is used to send an authentication authorization request message to the authentication authorization charging device, and the authentication authorization request message includes Terminal identification; the receiving unit is also used to receive the clock domain numbers of the M clock domains sent by the authentication, authorization and accounting device.
  • the M clock domains are the clock domains associated with the terminal, and the clock domain numbers of the M clock domains and the terminal identification There is an association relationship; the sending unit is also used to send clock domain numbers of M clock domains to the terminal.
  • the identifier of the terminal includes one or more of the following: the GPSI of the terminal, the IP address associated with the session, and at least one MAC address associated with the terminal.
  • the device 800 may be the data management network element in any of the foregoing embodiments, or may be a chip in the data management network element.
  • the processing unit 802 may be, for example, a processor
  • the communication unit may be, for example, a transceiver
  • the transceiver includes a radio frequency circuit
  • the storage unit may be, for example, a memory.
  • the processing unit 802 may be, for example, a processor
  • the communication unit may be, for example, an input / output interface, a pin, or a circuit.
  • the storage unit is a storage unit within the chip, such as a register, a cache, etc.
  • the storage unit may also be a storage unit located outside the chip within the data management network element, such as a ROM or static information and Instruction of other types of static storage devices, RAM, etc.
  • the communication unit 803 includes a sending unit and a receiving unit: a processing unit, configured to acquire the subscription information of the terminal; and according to the subscription information of the terminal, determine the clock domain numbers of the M clock domains associated with the terminal.
  • the sending unit is used to send clock domain numbers of M clock domains to the terminal.
  • the data management network element stores the relationship between the subscription information of the terminal and the clock domain numbers of the M clock domains associated with the terminal, or the data management network element stores the subscription information of the terminal and the subscription information includes the clocks of M clock domains Domain number.
  • the device 800 may be the policy control network element in any of the foregoing embodiments, or may be a chip in the policy network element control.
  • the processing unit 802 may be, for example, a processor
  • the communication unit may be, for example, a transceiver.
  • the transceiver includes a radio frequency circuit
  • the storage unit may be, for example, a memory.
  • the processing unit 802 may be, for example, a processor
  • the communication unit may be, for example, an input / output interface, a pin, or a circuit.
  • the storage unit is a storage unit within the chip, such as a register, a cache, etc.
  • the storage unit may also be a storage unit within the policy control network element located outside the chip, such as a ROM or static information and Instruction of other types of static storage devices, RAM, etc.
  • the processing unit is used to generate policy information, and the policy information includes clock domain numbers of M clock domains corresponding to applications to which the terminal subscribes.
  • the sending unit is used to send policy information to the terminal.
  • the policy information includes clock domain numbers of M clock domains corresponding to the application contracted by the terminal; then the processing unit is also used to obtain the contract information of the terminal from the data storage network element before generating the policy information
  • the subscription information includes an application to which the terminal subscribes, and the clock domain numbers of the M clock domains corresponding to the application to which the terminal subscribes are determined.
  • the clock synchronization method or clock domain used for execution is a terminal, or an access network device, or a session management network element, or a data management network element, or a policy control network element, the clock synchronization method or clock domain used for execution.
  • FIG. 9 shows a simplified schematic diagram of a possible design structure of the terminal involved in the embodiment of the present invention.
  • the terminal 900 includes a transmitter 901, a receiver 902, and a processor 903.
  • the processor 903 may also be a controller, which is represented as "controller / processor 903" in FIG.
  • the terminal 900 may further include a modem processor 905, where the modem processor 905 may include an encoder 906, a modulator 907, a decoder 908, and a demodulator 909.
  • the transmitter 901 adjusts (eg, analog conversion, filtering, amplification, up-conversion, etc.) output samples and generates an uplink signal, which is transmitted via the antenna to the access described in the above embodiment Network equipment.
  • the antenna receives the downlink signal transmitted by the access network device in the above embodiment.
  • the receiver 902 adjusts (eg, filters, amplifies, down-converts, digitizes, etc.) the signal received from the antenna and provides input samples.
  • the encoder 906 receives service data and signaling messages to be sent on the uplink, and processes the service data and signaling messages (eg, formatting, encoding, and interleaving).
  • the modulator 907 further processes (eg, symbol mapping and modulation) the encoded service data and signaling messages and provides output samples.
  • the demodulator 909 processes (eg, demodulates) the input samples and provides symbol estimates.
  • the decoder 908 processes (eg, deinterleaves and decodes) the symbol estimate and provides the decoded data and signaling messages sent to the terminal 900.
  • the encoder 906, the modulator 907, the demodulator 909, and the decoder 908 may be implemented by a synthesized modem processor 905. These units are processed according to the wireless access technology adopted by the wireless access network. It should be noted that, when the terminal 900 does not include the modem processor 905, the above functions of the modem processor 905 may also be completed by the processor 903.
  • the processor 903 controls and manages the terminal 900, and is used to execute the processing procedure performed by the terminal in the foregoing embodiment of the present invention.
  • the processor 903 is used to execute the process related to the terminal and / or other processes of the technical solution described in the present application in the clock synchronization method of any embodiment of the present application.
  • the terminal 900 may further include a memory 904, and the memory 904 is used to store program codes and data for the terminal 900.
  • FIG. 10 shows a possible structural schematic diagram of an access network device provided by an embodiment of the present invention.
  • the access network device 1000 includes a processor 1002 and a communication interface 1004.
  • the processor 1002 may also be a controller, which is represented as "controller / processor 1002" in FIG.
  • the communication interface 1004 is used to support the access network device to communicate with the terminal.
  • the access network device 1000 may further include a transmitter / receiver 1001.
  • the transmitter / receiver 1001 is used to support radio communication between the access network device and the terminal in the foregoing embodiment.
  • the processor 1002 can perform various functions for communicating with the terminal.
  • the uplink signal from the terminal is received via the antenna, demodulated by the receiver 1001 (for example, demodulating a high-frequency signal into a baseband signal), and further processed by the processor 1002 to restore the service sent by the terminal Data and signaling information.
  • the service data and signaling messages are processed by the processor 1002 and modulated by the transmitter 1001 (for example, modulating the baseband signal to a high-frequency signal) to generate a downlink signal and transmitted to the terminal via the antenna . It should be noted that the above-mentioned demodulation or modulation function may also be completed by the processor 1002.
  • the processor 1002 is also used to execute the processing procedure related to the access network device in any clock synchronization method in the embodiments of the present application and / or other procedures of the technical solution described in the present application.
  • the access network device 1000 may further include a memory 1003, and the memory 1003 is used to store the program code and data of the access network device 1000.
  • FIG. 10 only shows a simplified design of the access network device 1000.
  • the access network device 1000 may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all access network devices that can implement embodiments of the present invention are in the present invention. Within the protection scope of the embodiment.
  • the apparatus may be the above-mentioned session management network element, or data management network element, or policy control network element.
  • the device 1100 includes: a processor 1102, a communication interface 1103, and a memory 1101.
  • the device 1100 may further include a bus 1104.
  • the communication interface 1103, the processor 1102 and the memory 1101 may be connected to each other through a communication line 1104;
  • the communication line 1104 may be a peripheral component interconnection standard (PCI) bus or an extended industry standard architecture (extended industry standard architecture) , Referred to as EISA) bus.
  • PCI peripheral component interconnection standard
  • EISA extended industry standard architecture
  • the communication line 1104 can be divided into an address bus, a data bus, and a control bus. For ease of representation, only a thick line is used in FIG. 11, but it does not mean that there is only one bus or one type of bus.
  • the processor 1102 may be a CPU, a microprocessor, an ASIC, or one or more integrated circuits for controlling the execution of the program of the present application.
  • RAN wireless access network
  • WLAN wireless local area network
  • Wired access network etc.
  • the memory 1101 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM) or other types that can store information and instructions
  • the dynamic storage device can also be an electrically erasable programmable read-only memory (electrically programmable server read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, Disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can Any other media accessed by the computer, but not limited to this.
  • the memory may exist independently, and is connected to the processor through the communication line 1104. The memory can also be integrated with the processor.
  • the memory 1101 is used to store computer execution instructions for executing the solution of the present application, and the processor 1102 controls execution.
  • the processor 1102 is configured to execute computer-executed instructions stored in the memory 1101, so as to implement the clock domain determination method provided by the foregoing embodiments of the present application.
  • the computer execution instructions in the embodiments of the present application may also be called application program codes, which are not specifically limited in the embodiments of the present application.
  • At least one (a, b) of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be a single or Multiple.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center Transmit to another website, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more available medium integrated servers, data centers, and the like.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, Solid State Disk (SSD)), or the like.
  • a magnetic medium for example, a floppy disk, a hard disk, a magnetic tape
  • an optical medium for example, a DVD
  • a semiconductor medium for example, Solid State Disk (SSD)
  • the various illustrative logic units and circuits described in the embodiments of the present application may be implemented by general-purpose processors, digital signal processors, application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices. Discrete gate or transistor logic, discrete hardware components, or any combination of the above are designed to implement or operate the described functions.
  • the general-purpose processor may be a microprocessor, and optionally, the general-purpose processor may also be any conventional processor, controller, microcontroller, or state machine.
  • the processor may also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration achieve.
  • the steps of the method or algorithm described in the embodiments of the present application may be directly embedded in hardware, a software unit executed by a processor, or a combination of both.
  • the software unit may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium in the art.
  • the storage medium may be connected to the processor, so that the processor can read information from the storage medium and can write information to the storage medium.
  • the storage medium may also be integrated into the processor.
  • the processor and the storage medium may be provided in the ASIC, and the ASIC may be provided in the terminal.
  • the processor and the storage medium may also be provided in different components in the terminal.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operating steps are performed on the computer or other programmable device to produce computer-implemented processing, which is executed on the computer or other programmable device
  • the instructions provide steps for implementing the functions specified in one block or multiple blocks of the flowchart one flow or multiple flows and / or block diagrams.

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Abstract

本申请提供一种时钟同步方法及装置。该方法包括：终端接收接入网设备发送的N个时钟域的信息，一个时钟域的信息包括时钟域的第一时间信息和时钟域号，第一时间信息包括接入网设备发送时钟域的信息时，时钟域的时钟源的时间，时钟域号用于标识时钟域，N为大于1的整数；终端确定N个时钟域中的终端关联的M个时钟域，M为正整数；终端根据M个时钟域的信息，分别与M个时钟域的时钟源进行时钟同步。基于该方案，当一个终端关联M个时钟域的时钟源时，可以实现该终端与该M个时钟源的时钟同步。

Description

一种时钟同步方法及装置
相关申请的交叉引用
本申请要求在2018年10月25日提交中国专利局、申请号为201811250359.9、申请名称为“一种时钟同步方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及移动通信技术领域，尤其涉及一种时钟同步方法及装置。
背景技术
在目前的通信，一个终端可以通过接入网设备与一个时钟域的时钟源进行时钟同步，从而该终端可以与该时钟域的时钟源进行时钟同步。
随着通信技术的发展，一个终端可能需要关联多个时钟域的时钟源。在该场景下，如何实现终端通过接入网设备与多个时钟域的时钟源进行时钟同步，则是需要解决的问题。
发明内容
本申请提供一种时钟同步方法及装置，用以实现终端与多个时钟源的时钟同步。
第一方面，本申请提供一种时钟同步方法，该方法包括：终端接收接入网设备发送的N个时钟域的信息，一个时钟域的信息包括时钟域的第一时间信息和时钟域号，第一时间信息包括接入网设备发送时钟域的信息时时钟域的时钟源的时间，时钟域号用于标识时钟域，N为大于1的整数；终端确定N个时钟域中的终端关联的M个时钟域，M为正整数；终端根据M个时钟域的信息，分别与M个时钟域的时钟源进行时钟同步。基于该方案，当一个终端关联M个时钟域的时钟源时，可以实现该终端与该M个时钟源的时钟同步。
在一种可能的实现方式中，时钟域的信息还包括接入网设备的本地时钟与时钟域的时钟源之间的频率偏差值比。
在一种可能的实现方式中，终端接收接入网设备发送的N个时钟域的信息，包括：
终端接收接入网设备发送的广播信息，广播信息包括N个时钟域的信息；或者，
终端接收接入网设备发送的单播信息，单播信息包括N个时钟域的信息；或者，
终端接收接入网设备发送的N个单播信息，一个单播信息包括N个时钟域中的一个时钟域的信息。
基于上述方法，接入网设备可通过多种实现方式，向终端发送N个时钟域的信息。
在一种可能的实现方式中，终端确定N个时钟域中的终端关联的M个时钟域，包括：在会话的建立流程中，终端从核心网网元获取终端关联的M个时钟域的时钟域号，其中，核心网网元存储有终端的标识与M个时钟域的时钟域号的关联关系；
其中，终端的标识包括以下一种或多种：
终端的通用公共签约标识GPSI；
会话关联的IP地址；
终端关联的至少一个媒体接入控制MAC地址。
在又一种可能的实现方式中，终端确定N个时钟域中的终端关联的M个时钟域，包括：终端从核心网网元获取终端关联的M个时钟域的时钟域号，核心网网元包括数据管理网元或者策略控制网元；其中，核心网网元存储有终端的签约信息与终端关联的M个时钟域的时钟域号的关联关系，或者，核心网网元存储有终端的签约信息且签约信息包括M个时钟域的时钟域号。
基于上述方法，终端可以通过多种不同的方式，确定终端关联的M个时钟域。
在一种可能的实现方式中，终端接收接入网设备发送的N个时钟域的信息之前，终端与接入网设备进行定时提前测量，得到定时提前值，定时提前值用于确定终端与接入网设备之间的传输时延。
在一种可能的实现方式中，终端根据M个时钟域的信息与M个时钟域的时钟源进行时钟同步，包括：针对M个时钟域的第i时钟域，终端根据第i时钟域的信息和定时提前值，确定第i时钟域的第二时间信息，第二时间信息包括终端接收到接入网设备发送第i时钟域的信息时第i时钟域的时钟源的时间，i取遍1至M。
基于上述方法，终端可以分别与M个时钟域的时钟源进行时钟同步，实现了终端与一个或多个时钟源进行时钟同步。
第二方面，本申请提供一种时钟同步方法，该方法包括：接入网设备与N个时钟域的时钟源分别进行时钟同步；接入网设备与所述N个时钟域的时钟源时钟同步完成后，向终端发送N个时钟域的信息，一个时钟域的信息包括时钟域的第一时间信息和时钟域号，第一时间信息包括接入网设备发送时钟域的信息时时钟域的时钟源的时间，时钟域号用于标识时钟域，N为大于1的整数。基于该方案，接入网设备可以向终端发送该基站支持的N个时钟域的时钟源，从而使得基站可以从N个时钟源中选择该终端关联的时钟域进行时钟同步。
在一种可能的实现方式中，时钟域的信息还包括接入网设备的本地时钟与时钟域的时钟源之间的频率偏差值比。
在一种可能的实现方式中，接入网设备向终端发送N个时钟域的信息，包括：
接入网设备发送广播信息，广播信息包括N个时钟域的信息；或者，
接入网设备向终端发送单播信息，单播信息包括N个时钟域的信息；或者，
接入网设备向终端发送N个单播信息，一个单播信息包括N个时钟域中的一个时钟域的信息。
基于上述方法，接入网设备可通过多种实现方式，向终端发送N个时钟域的信息。
在一种可能的实现方式中，接入网设备向终端发送N个时钟域的信息之前，接入网设备接收终端或核心网网元发送的N个时钟域的时钟域号。
第三方面，本申请提供一种时钟同步方法，包括：终端向接入网设备发送终端关联的M个时钟域的时钟域号，M为正整数；终端接收接入网设备发送的与M个时钟域号对应的M个时钟域的信息，一个时钟域的信息包括时钟域的第一时间信息和时钟域号，第一时间信息包括接入网设备发送时钟域的信息时时钟域的时钟源的时间，时钟域号用于标识时钟域，N为大于1的整数；终端根据M个时钟域的信息，分别与M个时钟域的时钟源进行时钟同步。基于该方案，当一个终端关联M个时钟域的时钟源时，可以实现该终端与该 M个时钟源的时钟同步。
在一种可能的实现方式中，时钟域的信息还包括接入网设备的本地时钟与时钟域的时钟源之间的频率偏差值比。
在一种可能的实现方式中，终端接收接入网设备发送的与M个时钟域号对应的M个时钟域的信息，包括：
终端接收接入网设备发送的广播信息，广播信息包括M个时钟域的信息；或者，
终端接收接入网设备发送的单播信息，单播信息包括M个时钟域的信息；或者，
终端接收接入网设备发送的M个单播信息，一个单播信息包括M个时钟域中的一个时钟域的信息。
基于上述方法，接入网设备可通过多种实现方式，向终端发送N个时钟域的信息。
在一种可能的实现方式中，终端向接入网设备发送终端关联的M个时钟域的时钟域号之前，终端确定终端关联的M个时钟域。
在一种可能的实现方式中，终端确定终端关联的M个时钟域，包括：在会话的建立流程中，终端从核心网网元获取终端关联的M个时钟域的时钟域号，其中，核心网网元存储有终端的标识与M个时钟域的时钟域号的关联关系；其中，终端的标识包括以下一种或多种：终端的GPSI、会话关联的IP地址、终端关联的至少一个MAC地址。
在又一种可能的实现方式中，终端确定终端关联的M个时钟域，包括：终端从核心网网元获取终端关联的M个时钟域的时钟域号，核心网网元包括数据管理网元或者策略控制网元。其中，核心网网元存储有终端的签约信息与终端关联的M个时钟域的时钟域号的关联关系，或者，核心网网元存储有终端的签约信息且签约信息包括M个时钟域的时钟域号。
基于上述方法，终端可以通过多种不同的方式，确定终端关联的M个时钟域。
在一种可能的实现方式中，终端接收接入网设备发送的M个时钟域的信息之前，终端与接入网设备进行定时提前测量，得到定时提前值，定时提前值用于确定终端与接入网设备之间的传输时延。
在一种可能的实现方式中，终端根据M个时钟域的信息与M个时钟域的时钟源进行时钟同步，包括：针对M个时钟域的第i时钟域，终端根据第i时钟域的信息和定时提前值，确定第i时钟域的第二时间信息，第二时间信息包括终端接收到接入网设备发送第i时钟域的信息时，第i时钟域的时钟源的时间，i取遍1至M。
基于上述方法，终端可以分别与M个时钟域的时钟源进行时钟同步，实现了终端与多个时钟源进行时钟同步。
第四方面，本申请提供一种时钟域的确定方法，包括：会话管理网元接收来自终端的会话请求消息；会话管理网元向认证授权计费设备发送认证授权请求消息，认证授权请求消息包括终端的标识；会话管理网元接收认证授权计费设备发送的M个时钟域的时钟域号，M个时钟域为终端关联的时钟域，M个时钟域的时钟域号与终端的标识存在关联关系；会话管理网元向终端发送M个时钟域的时钟域号；其中，终端的标识包括以下一种或多种：终端的GPSI、会话关联的IP地址、终端关联的至少一个MAC地址。基于该方法，可由会话管理网元从认证授权计费设备获取终端关联的时钟域的时钟域号，并将时钟域号发送给终端，从而终端可以获知自身关联的时钟域。
第五方面，本申请提供一种时钟域的确定方法，包括：数据管理网元获取终端的签约信息；数据管理网元根据终端的签约信息，确定终端关联的M个时钟域的时钟域号；数据 管理网元向终端发送M个时钟域的时钟域号；其中，数据管理网元存储有终端的签约信息与终端关联的M个时钟域的时钟域号的关联关系，或者，数据管理网元存储有终端的签约信息且签约信息包括M个时钟域的时钟域号。基于该方法，可由数据管理网元获取终端关联的时钟域的时钟域号，并将时钟域号发送给终端，从而终端可以获知自身关联的时钟域。
第六方面，本申请提供一种时钟域的确定方法，包括：策略控制网元生成策略信息，策略信息包括终端签约的应用对应的M个时钟域的时钟域号；策略控制网元向终端发送策略信息。基于该方法，可由策略控制网元获取终端关联的时钟域的时钟域号，并将时钟域号发送给终端，从而终端可以获知自身关联的时钟域。
在一种可能的实现方式中，策略信息包括终端签约的应用对应的M个时钟域的时钟域号；策略控制网元生成策略信息之前，从数据存储网元获取终端的签约信息，签约信息包括终端签约的应用；策略控制网元确定终端签约的应用对应的M个时钟域的时钟域号。
第七方面，本申请提供一种通信装置，该通信装置具有实现上述方法实施例中终端或接入网设备的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可能的设计中，该通信装置包括：处理器、存储器、总线和通信接口；该存储器存储有计算机执行指令，该处理器与该存储器通过该总线连接，当该通信装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该通信装置执行如上述第一方面至第三方面、或第一方面至第三方面的任一实现方式中的时钟同步方法。例如，该通信装置可以是终端、或接入网设备等。
在另一种可能的设计中，该通信装置包括处理器，所述处理器与存储器耦合，所述存储器用于存储程序，当所述程序被所述处理器执行时，以使该通信装置执行如上述第一方面至第三方面、或第一方面至第三方面的任一实现方式中的时钟同步方法。
在另一种可能的设计中，该通信装置还可以是芯片，如终端的芯片、或接入网设备内的芯片，该芯片包括处理单元，可选地，还包括存储单元，该芯片可用于执行如上述第一方面至第三方面、或第一方面至第三方面的任一实现方式中的时钟同步方法。
第八方面，本申请提供一种通信装置，该通信装置具有实现上述方法实施例中会话管理网元、数据管理网元或策略控制网元的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可能的设计中，该通信装置包括：处理器、存储器、总线和通信接口；该存储器存储有计算机执行指令，该处理器与该存储器通过该总线连接，当该通信装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该通信装置执行如上述第四方面至第六方面、或第四方面至第六方面的任一实现方式中的时钟域的确定方法。例如，该通信装置可以是会话管理网元、数据管理网元或策略控制网元。
在另一种可能的设计中，该通信装置包括处理器，所述处理器与存储器耦合，所述存储器用于存储程序，当所述程序被所述处理器执行时，以使该通信装置执行如上述第四方面至第六方面、或第四方面至第六方面的任一实现方式中的时钟域的确定方法。
在另一种可能的设计中，该通信装置还可以是芯片，如会话管理网元的芯片、或数据管理网元的芯片、或策略控制网元的芯片，该芯片包括处理单元，可选地，还包括存储单元，该芯片可用于执行如上述第四方面至第六方面、或第四方面至第六方面的任一实现方式中的时钟域的确定方法。
第九方面，本申请提供一种存储介质，其上存储有计算机程序或指令，所述计算机程序或指令被执行时使得计算机执行如上述第一方面至第三方面、或第一方面至第三方面的任一实现方式中的时钟同步方法。
第十方面，本申请提供一种存储介质，其上存储有计算机程序或指令，所述计算机程序或指令被执行时使得计算机执行如上述第四方面至第六方面、或第四方面至第六方面的任一实现方式中的时钟域的确定方法。
第十一方面，本申请提供了一种计算机程序产品。该计算机程序产品包括计算机软件指令，该计算机软件指令可通过处理器进行加载来实现上述第一方面至第三方面中任意一项的时钟同步方法中的流程。
第十二方面，本申请提供了一种计算机程序产品。该计算机程序产品包括计算机软件指令，该计算机软件指令可通过处理器进行加载来实现上述第四方面至第六方面中任意一项的时钟域的确定方法中的流程。
第十三方面，本申请提供一种系统，该系统包括上述第一方面或第一方面的任一实现方式中的终端，和，上述第二方面或第二方面的任一实现方式中的接入网设备。
第十四方面，本申请提供一种系统，该系统包括上述第三方面或第三方面的任一实现方式中的终端，和，上述第二方面或第二方面的任一实现方式中的接入网设备。
附图说明
图1为本申请提供的一种可能的网络架构示意图；
图2为本申请提供的又一种可能的网络架构示意图；
图3A为本申请提供的一种时钟同步方法流程图；
图3B为本申请提供的时钟域1和时钟域2的频率示意图；
图3C为本申请提供终端的本地时钟与第i时钟域的本地时钟变化示意图；
图4为本申请提供的又一种时钟同步方法流程图；
图5为本申请提供的一种确定终端关联的时钟域的方法流程图；
图6为本申请提供的又一种确定终端关联的时钟域的方法流程图；
图7为本申请提供的又一种确定终端关联的时钟域的方法流程图；
图8为本申请提供的一种装置示意图；
图9为本申请提供的一种终端示意图；
图10为本申请提供的一种接入网设备示意图；
图11为本申请提供的一种装置示意图。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述。方法实施例中的具体操作方法也可以应用于装置实施例或系统实施例中。其中，在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。
本申请描述的架构以及业务场景是为了更加清楚的说明本申请的技术方案，并不构成对于本申请提供的技术方案的限定，随着网络架构的演变和新业务场景的出现，本申请提供的技术方案对于类似的技术问题，同样适用。
如图1所示，为本申请所适用的一种可能的网络架构示意图，包括接入网设备和至少一个终端。终端通过无线接口与接入网设备通信。如图所示，以一个接入网设备连接K个终端为例，其中K为正整数。
终端是一种具有无线收发功能的设备，终端可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。所述终端可以是手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端、增强现实(augmented reality，AR)终端、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端，以及还可以包括用户设备(user equipment，UE)等。终端还可以是蜂窝电话、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、个人数字助理(personal digital assistant，PDA)、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，未来第五代(the 5th generation，5G)网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端设备等。终端有时也可以称为终端设备、用户设备(user equipment，UE)、接入终端设备、车载终端、工业控制终端、UE单元、UE站、移动站、移动台、远方站、远程终端设备、移动设备、UE终端设备、终端设备、无线通信设备、UE代理或UE装置等。终端也可以是固定的或者移动的。本申请实施例对此并不限定。
接入网设备，也可以称为无线接入网(radio access network，RAN)设备，是一种为终端提供无线通信功能的设备。接入网设备例如包括但不限于：5G中的下一代基站(g nodeB，gNB)、演进型节点B(evolved node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved nodeB，或home node B，HNB)、基带单元(baseBand unit，BBU)、传输点(transmitting and receiving point，TRP)、发射点(transmitting point，TP)、移动交换中心等。接入网设备还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器、集中单元(centralized unit，CU)，和/或分布单元(distributed unit,DU)，或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备以及未来5G网络中的网络设备或者未来演进的PLMN网络中的网络设备等。终端可以与不同技术的多个接入网设备进行通信，例如，终端可以与支持长期演进(long term evolution，LTE)网络的接入网设备通信，也可以与支持5G网络的接入网设备通信，还可以支持与LTE网络的接入网设备以及5G网络的接入网设备的双连接。本申请实施例并不限定。
本申请中的终端在不同应用场景中类型不同，下面分别说明。
场景一，接入网设备连接的终端作为端点站点(end station)，即终端上没有连接其他设备，并且，一个终端对应一个时钟域。
基于该场景，则终端可以通过接入网设备与对应的时钟域的时钟源进行时钟同步。如图1所示，终端1可以与一个时钟域的时钟源进行时钟同步。
场景二，接入网设备连接的终端没有连接其他设备，但该终端中包括多个应用，一个 应用可以作为一个端点站点，一个应用对应一个时钟域。
基于该场景，终端的一个应用可以与该应用对应的时钟域的时钟源进行时钟同步，因此，支持多个应用的一个终端可以通过接入网设备与多个时钟域的时钟源进行时钟同步。如图1所示，假设终端2包括T个应用，T为正整数，一个应用对应一个时钟域，不同的时钟域的时钟源可以相同，也可以不同。因此，终端2可以与至多T个时钟域的时钟源进行时钟同步。
场景三，接入网设备连接的终端连接一个或多个其他设备，一个设备可以作为一个端点站点，一个设备对应一个时钟域，且该终端也可以对应一个时钟域。
基于该场景，终端连接的一个设备可以与该设备对应的时钟域的时钟源进行时钟同步，以及，该终端自身也可以与一个时钟域的时钟源进行时钟同步，因此，连接一个或多个其他设备的一个终端可以通过接入网设备与多个时钟域的时钟源进行时钟同步。如图1所示，终端3连接L个设备，L为正整数，一个设备对应一个时钟域，不同的时钟域的时钟源可以相同，也可以不同。因此，终端3可以与至多L+1个时钟域的时钟源进行时钟同步。比如，在工业控制领域，一个终端需要外接多个工业设备，如工业机器人、机械臂，因此，该终端以及该终端外接的工业设备需要与各自对应的时钟域的时钟源进行时钟同步。
需要说明的是，本申请中，对于终端与时钟域的时钟源进行同步，在不同的应用场景中可以有不同的含义，比如可以理解为终端的应用与时钟域的时钟源进行同步，或者理解为终端连接的设备与时钟域的时钟源进行同步，或者理解为终端自身与时钟域的时钟源进行同步。
需要说明的是，本申请中，一个时钟域内有一个时钟源，该时钟源也可以称为主时钟源。因此，终端与一个时钟域内的时钟源进行时钟同步，也可以称为终端与一个时钟域进行时钟同步，或者也可以称为终端与一个时钟域内的主时钟源进行时钟同步。
如图2所示，为本申请适用的又一种可能的网络架构示意图。该网络架构包括终端、接入网设备、用户面网元、移动性管理网元、会话管理网元、策略控制网元、数据存储网元、数据管理网元和认证授权计费设备。图2所示的终端和接入网设备可以是图1所示的终端和接入网设备，可参考图1相关描述。
用户面网元，主要负责对用户报文进行处理，如转发、计费、合法监听等。可选的，还可以接收数据。在5G网络中，用户面网元可以是用户面功能(user plane function，UPF)网元，在未来通信如第6代(6th generation，6G)网络中，用户面网元仍可以是UPF网元，或有其它的名称，本申请不做限定。
会话管理网元，主要用于移动网络中的会话管理，如会话创建、修改、释放。具体功能比如包括为用户分配互联网协议(internet protocol，IP)地址、选择提供报文转发功能的用户面网元，以及生成转发规则，并通过信令下发到用户面网元等。在5G网络中，会话管理网元可以是会话管理功能(session management function，SMF)网元，在未来通信如6G网络中，会话管理网元仍可以是SMF网元，或有其它的名称，本申请不做限定。
移动性管理网元，主要用于移动网络中的终端的注册、移动性管理、跟踪区更新流程。移动性管理网元终结了非接入层(non access stratum，NAS)消息、完成注册管理、连接管理以及可达性管理、分配跟踪区域列表(track area list，TA list)以及移动性管理等，并且透明路由会话管理(session management，SM)消息到会话管理网元。在5G网络中，移动性管理网元可以是接入与移动性管理功能(access and mobility management function， AMF)网元，在未来通信如6G网络中，移动性管理网元仍可以是AMF网元，或者有其它名称，本申请对此不作限定。
数据管理网元，主要用于负责管理签约数据，当签约数据修改的时候，负责通知相应的网元。在5G中，数据管理网元可以是统一数据管理(unified data management，UDM)网元，在未来通信如6G中，数据管理网元仍可以是UDM网元，或有其它的名称，本申请不做限定。
策略控制网元，其包含用户签约信息管理功能，策略控制功能，计费策略控制功能，服务质量(quality of service，QoS)控制等。在5G网络中，策略控制网元可以是策略控制功能(policy control function，PCF)网元，在未来通信如6G网络中，策略控制网元仍可以是PCF网元，或有其它的名称，本申请不做限定。
认证授权计费设备，其包括认证(Authentication)、授权(Authorization)和计费(Accounting)等功能，其中，认证功能包括验证用户的身份与可使用的网络服务，授权功能包括依据认证结果开放网络服务给用户，计费功能包括记录用户对各种网络服务的用量并提供给计费系统。认证授权计费设备可以位于3GPP网络内部，或者位于第三方网络中，本申请不限定。在5G网络中，认证授权计费设备可以是认证授权计费(Authentication Authorization and Accounting，AAA)功能网元，在未来通信如6G网络中，认证授权计费设备仍可以是AAA网元，或有其它的名称，本申请不做限定。
数据存储网元，其功能包括存储和检索签约信息、策略数据和公共架构数据等，可供数据管理网元、策略控制网元等获取相关数据。数据存储网元能够针对不同类型的数据如签约信息、策略数据有不同的数据接入鉴权机制，以保证数据接入的安全性。数据存储网元对于非法的服务化操作或者数据接入请求要能够返回携带合适原因值的失败响应。在5G网络中，数据存储网元可以是统一数据存储库(unified data repository，UDR)，在未来通信如6G网络中，数据库仍可以是UDR，或有其它的名称，本申请不做限定。
可以理解的是,上述功能既可以是硬件设备中的网络元件,也可以是在专用硬件上运行软件功能，或者是平台(例如,云平台)上实例化的虚拟化功能。
为方便说明，本申请后续，以终端为UE，接入网设备为基站，用户面网元为UPF网元，会话管理网元称为SMF网元，移动性管理网元为AMF网元，策略控制网元为PCF网元，数据管理网元为UDM网元，数据存储网元为UDR，认证授权计费设备为AAA网元为例进行说明。进一步地，将UPF网元简称为UPF，会话管理网元简称为SMF，AMF网元简称为AMF，PCF网元为PCF，UDM网元为UDM，AAA网元为AAA。即本申请后续所描述的UPF均可替换为用户面网元，SMF均可替换为会话管理网元，AMF均可替换为移动性管理网元，UDM均可替换为数据管理网元，UE均可替换为终端，UDR均可替换为数据存储网元，AAA均可替换为认证授权计费设备，基站均可替换为接入网设备。
在目前的现有技术中，一个UE只能与一个时钟域内的时钟源进行时钟同步。但随着通信技术的发展，需要一个UE与多个时钟域的时钟源进行时钟同步。比如，如图1所示的UE2中包括多个应用，每个应用需要与一个时钟域的时钟源进行时钟同步，因此一个支持多应用的UE需要与多个时钟域的时钟源进行时钟同步。再比如，如图1所示的UE3可以连接多个设备，每个设备需要与一个时钟域的时钟源进行时钟同步，因此一个连接多个设备的UE也需要与多个时钟域的时钟源进行时钟同步。
如图3A所示，为本申请提供的一种时钟同步方法，该方法可用于一个UE与一个或 多个时钟域的时钟源进行时钟同步。该方法包括以下步骤：
步骤301，基站与数据网络的N个时钟域的时钟源分别进行时钟同步。
这里的N个时钟域可以来自N个不同的数据网络，一个数据网络对应一个时钟域。或者，N个时钟域可以来自X个不同的数据网络(X为小于N的正整数)，一个数据网络对应一个或多个时钟域。本申请不做限定。
这里的数据网络例如可以是时间敏感网络(Time Sensitive Networking，TSN)、或者可以是分组数据网络，或者可以是企业网网络等，本申请不做限定。这里的N个时钟域为基站支持的时钟域中的部分或全部时钟域，数据网络对应的时钟域包括基站支持的时钟域，或者理解为，基站支持的时钟域为数据网络对应的时钟域的子集。
因此，基站可以与自身支持的部分或全部时钟域，即上述N个时钟域进行时钟同步。
由于各个时钟域采用的时间系统或者时间单位不完全相同，因此对于同一时刻，不同的时钟域的绝对时间也不完全相同。
比如，时钟域1和时钟域2采用的时间系统不同，时钟域1采用的时间系统是协调世界时(Coordinated Universal Time，UTC)，UTC的时间起点为世界时(Universal Time，UT)的1972年1月1日0时0分0秒。时钟域2采用的时间系统是全球定位系统时间(Global Positioning System，GPS)，也就是GPS原子时，它的时间基准是1980年1月6日0点与世界协调时刻相一致，以后按原子时秒长累积计时。GPS时间跟UTC时间之差为秒的整倍数。如1989年GPS时间跟UTC时间之差为为5秒，1996年GPS时间跟UTC时间之差为为11秒，2002年GPS时间跟UTC时间之差为13秒。
比如，如图3B所示，为时钟域1和时钟域2的频率示意图。时钟域1和时钟域2采用的时间单位不同，从而使得时钟域1和时钟域2的频率不同步。频率同步是指不同的信号在相同的时间间隔内有相同的脉冲个数。在相同的时间间隔内，时钟域1认为1分钟等于60个脉冲周期，即1个脉冲周期是1秒，时钟域2认为1分钟等于30个脉冲周期，即1个脉冲周期是2秒，也就是说，因为两个时钟域的秒长不一样，也就是时间尺度不一样，最终随着时间的累积，两者之间就会产生偏差。则对于同一时刻，时钟域1的时钟源1的绝对时间1与时钟域2的时钟源2的绝对时间2可能不同。
基站在与N个时钟域的时钟源分别进行时钟同步之后，基站可以获知各个时钟源的绝对时间。比如针对当前时刻，基站可以获知时钟域1的时钟源1对应的绝对时间为T1，时钟域2的时钟源2对应的绝对时间为T2。
基站与N个时钟域的时钟域分别进行时钟同步之后，将会触发基站向UE发送各个时钟域的信息，或者理解为，将会触发基站通知UE与时钟源进行时钟同步。
步骤302，基站向与该基站连接的UE发送N个时钟域的信息。相应地，UE可以接收到该N个时钟域的信息。N为大于1的整数。
需要说明的是，基站可以向与该基站连接的所有UE发送该N个时钟域的信息，比如通过广播的方式向与该基站连接的所有UE发送该N个时钟域的信息。或者，基站也可以向与该基站连接的部分UE(如某个或某些小区的UE)发送该N个时钟域的信息，比如可以通过组播或广播的方式向与该基站连接的部分UE发送该N个时钟域的信息。
这里时钟域的信息，包括该时钟域的第一时间信息和时钟域号，其中，时钟域号用于标识时钟域，第一时间信息包括基站发送该时钟域的信息时，该时钟域的时钟源的时间。
可选的，这里的第一时间信息包括的时钟域的时钟源的时间是以该时钟源的时间单位 为准进行计时的，也即第一时间信息包括的时钟域的时钟源的时间是该时钟源的绝对时间。
比如，基站向UE发送两个时钟域的信息，其中：
第一时钟域的信息包括：T1、Number-1，
第二时钟域的信息包括：T2、Number-2。
其中，T1为第一时钟域的第一时间信息，即为基站向UE发送第一时钟域的信息时，第一时钟域的时钟源的时间，Number-1为第一时钟域的时钟域号，T2为第二时钟域的第一时间信息，即为基站向UE发送第二时钟域的信息时，第二时钟域的时钟源的时间，Number-2为第二时钟域的时钟域号。
可选的，一个时钟域的信息还包括基站的本地时钟与该时钟域的时钟源之间的频率偏差值比。频率偏差值比可用于指示基站的本地时钟与时钟源之间对于时间单位的认知差异。比如，基站的本地时钟认为1分钟等于60个脉冲周期，即1个脉冲周期是1秒，第一时钟域的时钟源认为1分钟等于60个脉冲周期，则基站的本地时钟与第一时钟域的时钟源之间的频率偏差值比为1。再比如，基站的本地时钟认为1分钟等于30个脉冲周期，即1个脉冲周期是2秒，第二时钟域的时钟源认为1分钟等于60个脉冲周期，则基站的本地时钟与第二时钟域的时钟源之间的频率偏差值比为2。
因此，在一种实现方式中，若基站向UE发送两个时钟域的信息，则两个时钟域的信息例如分别可以为：
第一时钟域的信息包括：T1、Number-1、FrequencyRateRatio 1，
第二时钟域的信息包括：T2、Number-2、FrequencyRateRatio 2，
其中，FrequencyRateRatio 1为基站的本地时钟与第一时钟域的时钟源之间的频率偏差值比，FrequencyRateRatio 2为基站的本地时钟与第二时钟域的时钟源之间的频率偏差值比。
在又一种实现方式中，若基站的本地时钟与时钟域的时钟源之间的频率偏差值比为1，则基站在向UE发送的该时钟域的信息中可以不包括基站的本地时钟与该时钟域的时钟源之间的频率偏差值比。例如，若上述FrequencyRateRatio1＝1，则基站向UE发送的两个时钟域的信息分别可以为：
第一时钟域的信息包括：T1、Number-1，
第二时钟域的信息包括：T2、Number-2、FrequencyRateRatio2。
针对该步骤302，在具体实现中，基站可以通过以下至少三种不同的实现方法，将时钟域的信息发送给UE。
实现方法一，基站发送广播信息，从而UE可以接收到广播信息，该广播信息包括N个时钟域的信息。
这里的广播信息，在具体实现中，例如可以是广播消息，比如可以是以系统信息块16(System Information Block 16，SIB16)消息为基础进行扩展，在SIB16消息中包括N个时钟域的信息，然后广播发送SIB16。
以广播信息为广播消息，N＝3为例，则该广播消息可以包括：
TimeReferenceInfo information elements
{
time domain number Number-1，
T T1，
FrequencyRateRatio FrequencyRateRatio 1，
time domain number Number-2，
T T2，
FrequencyRateRatio FrequencyRateRatio 2，
time domain number Number-3，
T T3，
FrequencyRateRatio FrequencyRateRatio 3，
}
实现方法二，基站向UE发送单播信息，该单播信息包括N个时钟域的信息。
该实现方法中，基站向需要进行时钟同步的UE发送单播信息，该单播信息具体可以是一个单播消息，从而UE可以接收到单播信息，且单播信息中包括N个时钟域的信息。
这里的单播信息，在具体实现中，例如可以是单播消息，具体的可以是以单播消息为基础进行扩展，在单播消息中包括N个时钟域的信息，然后向UE发送该单播消息。
以单播信息为单播消息，N＝3为例，则该单播消息可以包括：
TimeReferenceInfo information elements
{
time domain number Number-1，
T T1，
FrequencyRateRatio FrequencyRateRatio 1，
time domain number Number-2，
T T2，
FrequencyRateRatio FrequencyRateRatio 2，
time domain number Number-3，
T T3，
FrequencyRateRatio FrequencyRateRatio 3，
}
实现方法三，基站向UE发送N个单播信息，一个单播信息包括N个时钟域中的一个时钟域的信息。
该实现方法中，基站通过N个单播，分别向同一个UE发送N个时钟域的信息，一个单播信息包括一个时钟域的信息。比如，第一个单播信息携带第一时钟域的信息，第二个单播信息携带第二时钟域的信息，依次类推。
以单播信息为单播消息，N＝3为例，则该单播消息1可以包括：
TimeReferenceInfo information element1
{
time domain number Number-1，
T T1，
FrequencyRateRatio FrequencyRateRatio 1，
}
单播消息2可以包括：
TimeReferenceInfo information element2
{
time domain number Number-2，
T T2，
FrequencyRateRatio FrequencyRateRatio 2，
}
单播消息3可以包括：
TimeReferenceInfo information element3
{
time domain number Number-3，
T T3，
FrequencyRateRatio FrequencyRateRatio 3，
}
其中，上述实现方法一至实现方法三中的各个参数的含义如下：Number-1为第一时钟域的时钟域号，T1为第一时钟域的第一时间信息，即为基站向UE发送第一时钟域的信息时第一时钟域的时钟源的时间，FrequencyRateRatio 1为基站的本地时钟与第一时钟域的时钟源之间的频率偏差值比。Number-2为第二时钟域的时钟域号，T2为第二时钟域的第一时间信息，即为基站向UE发送第二时钟域的信息时第二时钟域的时钟源的时间，FrequencyRateRatio 2为基站的本地时钟与第二时钟域的时钟源之间的频率偏差值比。Number-3为第三时钟域的时钟域号，T3为第三时钟域的第一时间信息，即为基站向UE发送第三时钟域的信息时第三时钟域的时钟源的时间，FrequencyRateRatio 3为基站的本地时钟与第三时钟域的时钟源之间的频率偏差值比。
步骤303，UE确定N个时钟域中的UE关联的M个时钟域，M为正整数。
UE在接收到基站发送的N个时钟域的信息之后，从该N个时钟域中确定该UE所关联的M个时钟域。
这里，UE关联的M个时钟域，针对不同的UE具有不同的含义。
比如，若该UE是上述图1中描述的场景一中的UE，则该UE关联的M个时钟域指的是该UE关联的一个时钟域(即M＝1)，即该UE可以与一个时钟域的时钟源进行时钟同步。
再比如，若该UE是上述图1中描述的场景二中的UE，则该UE关联的M个时钟域指的是该UE中的M个应用分别关联的M个时钟域，一个应用关联一个时钟域，即一个应用可以与一个时钟域的时钟源进行时钟同步。
再比如，若该UE是上述图1中描述的场景三中的UE，则该UE关联的M个时钟域指的是该UE自身关联的一个时钟域及该UE连接的M-1个设备分别关联的M-1个时钟域，其中，一个设备关联一个时钟域，且该UE也关联一个时钟域。
针对UE确定该UE关联的M个时钟域的具体实现方法，后续会具体进行说明。
步骤304，UE根据M个时钟域的信息，分别与M个时钟域时钟源进行时钟同步。
UE在确定了关联的M个时钟域之后，针对M个时钟域中的每个时钟域，可以分别与 该时钟域的时钟源进行时钟同步。
作为示例，下面给出UE与时钟域的时钟源进行时钟同步的实现方法。在基站向UE发送N个时钟域的信息之前，UE与基站的本地时钟实现时钟同步，并且UE与基站还进行定时提前测量，从而得到定时提前值(Timing Advance),该定时提前值用于确定UE与基站之间的传输时延。比如，在随机接入过程中，基站通过测量从UE接收到的前缀(preamble)序列来确定定时提前值。需要说明的是，该定时提前值是以基站的本地时钟的时间单位为基准进行计算的。可以理解为，通过定时提前测量，UE的本地时钟跟基站的本地时钟实现了频率同步。
在UE与基站保持时钟同步且UE获取到定时提前值的前提下，当UE接收到基站发送的N个时钟域的信息且确定出其中该UE关联的M个时钟域之后，则UE可以与该M个时钟域分别进行时钟源的时钟同步。
比如，针对M个时钟域的第i时钟域，UE根据第i时钟域的信息和定时提前值，确定第i时钟域的第二时间信息，第二时间信息包括UE接收到基站发送第i时钟域的信息时第i时钟域的时钟源的时间，i取遍1至M。需要说明的是，这里的第二时间信息包括的时钟域的时钟源的时间是该时钟源的绝对时间。
具体的，第i时钟域的第二时间信息＝第i时钟域的第一时间信息+TA/2*FrequencyRateRatio i，其中，第i时钟域的第一时间信息为第i时钟域的信息中包括的第一时间信息，TA为定时提前值，考虑到下行传输时延，基站与UE对参考帧边界的认知存在误差，基站与UE之间的下行传输时延可以近似等于TA/2，FrequencyRateRatio i为基站的本地时钟与第i时钟域的时钟源之间的频率偏差值比。TA/2*FrequencyRateRatio i为用第i时钟域的时钟源的时间单位表示的基站与UE之间的下行传输时延，由于第i时钟域的第一时间信息为基站向UE发送第i时钟域的信息时第i时钟域的时钟源的时间，因此第i时钟域的第一时间信息+TA/2*FrequencyRateRatio i为UE收到第i时钟域的信息时第i时钟域的时钟源的时间。
需要说明的是，若第i时钟域的信息没有携带FrequencyRateRatio i，则UE默认FrequencyRateRatio i＝1，因此则可以通过以下公式计算第i时钟域的第二时间信息，即第i时钟域的第二时间信息＝第i时钟域的第一时间信息+TA/2。
UE在计算得到一个时钟域的第二时间信息后，该UE可以根据第二时间信息计算任意时刻下，该时钟域的本地时钟的绝对时间，实现与该时钟域的时钟源完成了时钟同步。或者，可以理解为，UE根据时钟域的第二时间信息所表示的绝对时间，计算该绝对时间前后的其他绝对时间，实现与该时钟域的时钟源完成了时钟同步。
比如，在一种实现方式中，若上述步骤302中，基站与时钟域的时钟源进行时钟同步之后，该基站是通过广播信息向UE发送N个时钟域的信息，则该一个时钟域的信息中包括的第一时间信息可以是该广播消息所在系统信息窗口(SI-Window)的所在帧的帧尾边界的时间，该帧尾边界的时间对应该时钟域的时钟源的绝对时间。则UE在计算得到该时钟域的第二时间信息后，即获取了该时钟域的绝对时间。进一步地，通过步骤302，UE获取到了FrequencyRateRatio i，即基站的本地时钟与第i时钟域的时钟源之间的频率偏差值比，由于UE的本地时钟跟基站的本地时钟已经进行了频率同步，所以UE根据FrequencyRateRatio i可以获取UE的本地时钟与第i时钟域的时钟源之间的频率偏差值比，比如可以使用FrequencyRateRatioUE i表示UE的本地时钟与第i时钟域的时钟源之间的频 率偏差值比，其中，FrequencyRateRatioUE i与FrequencyRateRatio i相等。
至此，UE获取到的信息有：
1、第i时钟域的第二时间信息，即第i时钟域的本地时钟的绝对时间；
2、FrequencyRateRatioUE i，即UE的本地时钟与第i时钟域的时钟源之间的频率偏差值比。
该UE可以根据第i时钟域的第二时间信息计算任意时刻下，该时钟域的本地时钟的绝对时间，因此UE与时钟源之间保持了时钟同步。
再比如，在又一种实现方式中，若上述步骤302中，基站与时钟域的时钟源进行时钟同步之后，该基站是通过单播信息向UE发送N个时钟域的信息，则在单播信息中还可以包括一个参考帧号，则一个时钟域的信息中包括的第一时间信息可以是该时钟域的时钟源记录的针对该参考帧号指示的参考帧的帧尾边界的时间，该帧尾边界的时间对应该时钟域的时钟源的绝对时间。则UE在计算得到该时钟域的第二时间信息后，即获取了该时钟域的绝对时间。该UE可以根据第i时钟域的第二时间信息计算任意时刻下，该时钟域的本时钟的绝对时间，因此UE与时钟源之间保持了时钟同步。
例如，如图3C所示，为本申请提供UE的本地时钟与第i时钟域的本地时钟变化示意图，其中，UE可以计算得到FrequencyRateRatioUE i，即UE的本地时钟与第i时钟域的时钟源之间的频率偏差值比。比如，基于上述方法，在对UE与第i时钟源进行同步时，第i时钟域的本地时钟为T1，UE可以计算得到第i时钟域的本地时钟为T1，并且当第i时钟域的本地时钟源为T1时，UE的本地时钟为T2。则UE从T2时刻开始，可以计算得到任一时刻下，UE根据UE的本地时钟，计算得到第i时钟源的本地时钟，此时即为实现了UE与第i时钟域的时钟源的同步。比如，当UE的本地时钟为T3(这里，T3为T2之后的任一时刻)时，假设第i时钟域的本地时钟为T4，则有如下关系成立：(T3-T2)/(T4-T1)＝FrequencyRateRatioUE i，因此，UE可以计算得到第i时钟域的本地时钟T4＝(T3-T2)/FrequencyRateRatioUE i+T1。也即，UE可以根据UE的本地时钟T2之后的任一时刻T3，计算得到第i时钟域的本地时钟T4，即实现了UE与第i时钟域的时钟源之间的时钟同步。
需要说明的是，若第i时钟域的信息没有携带FrequencyRateRatio i，则UE默认FrequencyRateRatio i＝1，即FrequencyRateRatioUE i＝1，那么UE可以计算得到第i时钟域的本地时钟T4＝T3-T2+T1。
基于上述方法，实现了一个UE与该UE关联的多个时钟域的时钟源进行时钟同步，提升了UE进行时钟同步的效率。
如图4所示，为本申请提供的又一种时钟同步方法，该方法可用于一个UE与一个或多个时钟域的时钟源进行时钟同步。该方法包括以下步骤：
步骤401，基站与数据网络的N个时钟域的时钟源分别进行时钟同步。
该步骤与图3A所示的实施例中的步骤301相同，可参考前述描述，这里不再赘述。
需要说明的是，该实施例的步骤401中，基站与数据网络的时钟域的时钟源进行时钟同步后，不会触发基站主动向UE发送N个时钟域的信息。
步骤402，UE确定关联的M个时钟域，M为正整数。
该步骤与图3A所示的实施例中的步骤303相同，可参考前述，这里不再赘述。
需要说明的是，当UE确定需要进行时钟同步时，可触发UE执行该步骤402及后续步骤。
步骤403，UE向基站发送该UE关联的M个时钟域的时钟域号。
作为一种实现方式，UE可以向基站发送请求消息，该请求消息包括UE关联的M个时钟域的时钟域号，该请求消息用于请求获取该M个时钟域的信息。
步骤404，基站向UE发送与M个时钟域号对应的M个时钟域的信息。相应地，UE可以接收到该M个时钟域的信息。
需要说明的是，基站可以通过上述步骤401获取到N个时钟域的信息并存储于本地，这里的N个时钟域的信息包括了UE所请求的M个时钟域的信息，因此，基站可以基于UE的请求，将M个时钟域号对应的M个时钟域的信息发送至UE。
需要说明的是，该步骤404中基站发送的M个时钟域的信息的具体内容，可以参考前述步骤302中的相关描述。并且，基站发送M个时钟域的信息的具体实现方法(包括广播发送和单播发送)也可以参考前述步骤302中的相关描述。这里不再赘述。
步骤405，UE根据M个时钟域的信息，分别与M个时钟域时钟源进行时钟同步。
该步骤与上述步骤304的具体实现方法相同，可参考前述描述。
基于上述方法，实现了一个UE与该UE关联的多个时钟域的时钟源进行时钟同步，提升了UE进行时钟同步的效率。
该图4所示的实施例与上述图3A所示的实施例的主要区别在于：图4所示的实施例中，基站是基于UE的请求，向UE发送该UE所请求的时钟域的信息。而图3A所示的实施例中，基站是将自身所支持的部分或全部时钟域的信息发送至UE，然后UE再从中确定自身所关联的时钟域的信息。具体实现中，可根据实际需要，选择相应的执行方法。
需要说明的是，作为一种可替代的实现方式，针对图4所示的实施例的步骤402和步骤403也可以替换为以下步骤A和步骤B。
步骤A,核心网网元确定UE关联的M个时钟域的时钟域号。
比如，核心网网元(如SMF、PCF或UDM等)通过以下图5-图7任一实施例的方法，获取到UE关联的M个时钟域的时钟域号。
步骤B，核心网网元通过AMF，向基站发送UE关联的M个时钟域的时钟域号。
核心网网元获取到UE关联的M个时钟域的时钟域号后，通过AMF向基站发送UE关联的M个时钟域的时钟域号，从而触发基站向UE发送UE关联的M个时钟域的信息，进而使得UE进行时钟同步。
该可替代方法与上述图4所示的实施例的区别在于，是由核心网网元触发基站向UE发送UE关联的M个时钟域的时钟域的信息，进而使得UE进行时钟同步。
下面针对图3A所示的实施例的步骤303、或针对图4所示的实施例的步骤402，给出几种不同的实现方法。即给出UE确定该UE关联的M个时钟域的具体实现方法。
实现方法一，在会话的建立流程中，UE从核心网网元获取UE关联的M个时钟域，其中，核心网网元存储有UE的标识与M个时钟域的时钟域号的关联关系。其中，UE的标识包括以下一种或多种：UE的通用公共签约标识(Generic Public Subscription Identity，GPSI)、会话关联的IP地址、UE关联的至少一个媒体接入控制(medium access control，MAC)地址。这里的核心网网元可以是AAA，也可以是SMF。
比如，在会话的建立流程中，UE向SMF发送会话请求消息，SMF向AAA发送认证授权请求消息，认证授权请求消息包括UE的标识，然后AAA获取该UE的标识对应的M个时钟域的时钟域号。AAA向SMF发送M个时钟域的时钟域号。然后，SMF向UE发送M个时钟域的信时钟域号。从而UE可以获取到该UE关联的M个时钟域的时钟域号。
下面结合图5给出该实现方法的一种具体实现流程。如图5所示，为本申请提供的一种确定终端关联的时钟域的方法。
其中，外部网络的AAA上配置有不同的UE的标识对应的时钟域的时钟域号。其中，UE的标识例如可以是IP地址、MAC地址、GPSI中的一个或多个。
以AAA上配置MAC地址对应的时钟域号为例，则AAA上配置的信息可以如表1所示。
表1
MAC地址 该MAC地址对应的时钟域的信息
MAC address-1：00-50-BA-CE-07-0C 时钟域号-1
MAC address-2：00-50-BA-CE-07-1C 时钟域号-2
MAC address-3：00-50-BA-CE-07-2C 时钟域号-2
MAC address-4：00-50-BA-CE-07-3C 时钟域号-3
或者，AAA上还可以配置MAC地址段对应的时钟域号，一个MAC地址段包括多个MAC地址，则AAA上配置的信息可以如表2所示。
表2
Figure PCTCN2019113250-appb-000001
图5所示的方法包括以下步骤：
步骤501，UE发起协议数据单元(protocol data unit，PDU)会话建立请求。
可选的，该PDU会话建立请求中携带PDU会话标识，单网络切片选择辅助信息(single network slice selection assistance information，S-NSSAI)，数据网名称(Data Network Name，DNN)以及会话管理(session management,SM)PDU DN Request Container等参数，其中SM PDU DN Request Container用于跟外部网络进行PDU会话的鉴权。
步骤502，AMF向SMF发送创建会话上下文请求。
AMF接收到UE的PDU会话建立请求后，选择SMF，并向SMF发送创建会话上下文请求，比如可以通过调用SMF的Nsmf_PDUSession_CreateSMContext Request服务操作，请求SMF为UE创建会话上下文。
步骤503，SMF向AAA发送认证/授权(Authentication/Authorization)请求消息。
可选的，该请求消息可以携带SM PDU DN Request Container、UE的GPSI，其中SM PDU DN Request Container可以包括PDU会话标识。
步骤504，AAA执行PDU会话建立的认证/授权流程，若鉴权成功，则AAA根据UE 的标识，确定该UE关联的M个时钟域的时钟域号。
比如，AAA可以根据UE的GPSI确定该UE对应的MAC地址，然后通过上述表1或表2，查找得到该MAC地址对应的时钟域号。
需要说明的是，这里的UE对应的MAC地址，在不同的应用场景中，具有不同的含义。
比如，针对图1所示的实施例中的场景一，一个UE没有关联其他设备且该UE对应一个时钟域，则这里UE对应的MAC地址指的是该UE的MAC地址，因此该UE可以从AAA获取到该UE自身对应的时钟域的时钟域号。
再比如，针对图1所示的实施例中的场景三，一个UE关联了其他设备，则这里UE对应的MAC地址指的是该UE的MAC地址以及该UE关联的其他设备的MAC地址，因此该UE可以从AAA获取到该UE自身对应的时钟域的时钟域号，以及获取到该UE关联的其他设备的对应的时钟域的时钟域号。
步骤505，AAA向SMF发送认证/授权响应消息，该响应消息携带该UE关联的M个时钟域的时钟域号。
步骤506，SMF向AMF发送UE关联的M个时钟域的时钟域号。
例如，SMF可以通过Namf_Communication_N1N2MessageTransfer消息，向AMF发送UE关联的M个时钟域的时钟域号。
步骤507，AMF向UE发送PDU会话建立响应消息，该响应消息包括UE关联的M个时钟域的时钟域号。
通过图5所示的方法，UE可以在会话建立流程中，从AAA或SMF获取到该UE关联M个的时钟域的时钟域号。
需要说明的是，上述是以AAA存储有MAC地址(或MAC地址段)与时钟域的时钟域号的对应关系为例进行说明。作为又一种实现方式，AAA也可以存储IP地址与时钟域的时钟域号的对应关系，从而AAA可以根据UE请求建立的会话的IP向UE发送该IP对应的时钟域的时钟域号。或者AAA存储有GPSI与时钟域的时钟域号的对应关系，从而AAA可以根据UE的GPSI向UE发送该GPSI对应的时钟域的时钟域号。
实现方法二，UE从核心网网元获取UE的关联的M个时钟域，其中，核心网网元存储有UE的签约信息与UE的关联的M个时钟域的时钟域号的关联关系，或者，核心网网元存储有UE的签约信息且签约信息包括M个时钟域的时钟域号，核心网网元包括UDM或者PCF。
比如，在一种实现方式中，UDM存储有UE的签约信息与UE关联的M个时钟域的时钟域号的关联关系，或者，UDM存储有UE的签约信息且签约信息包括M个时钟域的时钟域号。在UE的注册流程中，UDM获取UE的签约信息，然后根据UE的签约信息，确定UE关联的M个时钟域的时钟域号，接着向UE发送M个时钟域的时钟域号。
对于该实现方式，下面结合图6给出一种具体实现过程。如图6所示，为本申请提供的一种确定终端关联的时钟域的方法。
在一种实现方法中，该方法可以应用于图1所示的实施例的场景一，则网管系统(Operation，Administration and Maintenance，OAM)可以预先根据UE的设备类型，判断该UE所属的时钟域，然后为UE生成时钟域号并存储在UDM中。比如可以在UDM中存储该UE的签约信息且该UE的签约信息包括该时钟域号，或者在UDM中存储该UE的签约 信息与该时钟域号的关联关系。
在又一种实现方法中，该方法还可以应用于图1所示的实施例的场景三，则OAM可以预先根据UE的设备类型以及UE连接的设备的设备类型，判断该UE所属的时钟域以及判断该UE连接的设备所属的时钟域，然后为UE生成时钟域号以及为UE连接的设备生成时钟域号，并存储在UDM中。比如可以在UDM中存储该UE的签约信息且该UE的签约信息包括该UE所属的时钟域号和该UE连接的设备所属的时钟域号，或者在UDM中存储该UE的签约信息，与该UE所属的时钟域号和该UE连接的设备所属的时钟域号的关联关系。
图6所示的实施例包括以下方法步骤：
步骤601，UE发起注册流程，向AMF发送注册请求消息。
该消息中携带UE的标识。
步骤602，参考注册流程中的其他步骤。
比如，AMF收到UE的注册请求之后，可以发起安全流程，执行对UE的鉴权。以及还包括其他步骤，可参考现有技术相关描述。
步骤603，AMF调用UDM的Nudm_SDM_get服务操作，请求获取该UE的签约信息。
可选的，该步骤603之前，AMF还可以调用UDM的Nudm_UECM_Registration服务操作，触发UDM存储AMF的标识与UE的标识之间的关联关系。
步骤604，UDM将该UE关联的M个时钟域的时钟域号，通过Nudm_SDM_get应答(ACK)返回给AMF。
在一种实现方式中，若UDM存储有UE的签约信息与UE关联的M个时钟域的时钟域号的关联关系，则该步骤604具体可以实现为：UDM向AMF发送该UE的签约信息以及UE关联的M个时钟域的时钟域号。
在又一种实现方式中，若UDM存储有UE的签约信息且签约信息包括M个时钟域的时钟域号，则该步骤604具体可以实现为：UDM向AMF发送该UE的签约信息，该签约信息包括该UE关联的M个时钟域的时钟域号。
步骤605，AMF获取该UE关联的M个时钟域的时钟域号。
步骤606，AMF向UE发送注册接受消息，该消息携带该UE关联的M个时钟域的时钟域号。
通过图6所示的实施例，UE可以在注册流程中，从UDM获取到该UE关联的M个时钟域的时钟域号。
再比如，在又一种实现方式中，PCF可以从UDR获取UE的签约信息，签约信息包括UE签约的应用，PCF确定UE签约的应用对应的M个时钟域的时钟域号。然后，PCF生成策略信息，策略信息包括UE签约的应用对应的M个时钟域的时钟域号。接着，PCF向UE发送策略信息。
比如，UDR中存储的UE签约的应用与时钟域的时钟域号的关联关系可以如表3所示。
表3
应用标识 该应用对应的时钟域的时钟域号
Application-1 Number-1
Application-2 Number-2
Application-3 Number-2
Application-4 Number-3
对于该实现方式，下面结合图7给出一种具体实现过程。如图7所示，为本申请提供的一种确定终端关联的时钟域的方法。该方法可应用于图1所示的实施例的场景二，即UE包括M个应用，一个应用关联一个时钟域。
该方法包括以下步骤：
步骤701，UE发起注册流程，向AMF发送注册请求消息。
该消息中携带UE的标识。
步骤702，参考注册流程中的其他步骤。
比如，AMF收到UE的注册请求之后，可以发起安全流程，执行对UE的鉴权。以及还包括其他步骤，可参考现有技术相关描述。
步骤703，若AMF本地没有存储该UE相关的接入和移动性管理策略，AMF则执行接入与移动性策略关联建立(AM Policy Association Establishment)流程，AMF调用PCF的Npcf_AMPolicyControl_Create服务化操作，携带UE的永久标识(SUPI)，签约通知指示以及UE的外部标识(GPSI)等信息。
该步骤为可选步骤。
步骤704，PCF调用UDR的Nudr_DM_Query服务操作(携带SUPI),UDR将该UE签约的应用信息，以及策略数据(Policy Data),UE上下文策略控制数据(UE context policy control data)等返回至PCF。
步骤705，PCF为UE生成策略信息，该策略信息包含UE签约的应用对应的M个时钟域的时钟域号。
例如，UE签约的应用为Application-1和Application-3，根据表3，PCF可以确定Application-1和Application-3对应的时钟域号分别为Number-1和Number-2。
步骤706，PCF调用Npcf_AMPolicyControl_response服务操作，向AMF发送策略信息，该策略信息包括UE签约的应用对应的M个时钟域的时钟域号。
步骤707，AMF向UE发送注册接受消息，该注册接受消息包括策略信息，该策略信息包括UE签约的应用对应的M个时钟域的时钟域号。
通过该实施例，PCF为UE生成策略信息，UE通过策略信息确定该UE签约的应用对应的M个时钟域的时钟域号。
上述主要从各个网元之间交互的角度对本申请提供的方案进行了介绍。可以理解的是，上述实现各网元为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本发明能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
在采用集成的单元的情况下，图8示出了本发明实施例中所涉及的装置的可能的示例性框图，该装置800可以以软件的形式存在，也可以以硬件的形式存在，还可以以软件和 硬件的形式存在，本申请实施例不做限定。装置800可以包括：处理单元802和通信单元803。作为一种实现方式，该通信单元803可以包括接收单元和/或发送单元。处理单元802用于对装置800进行控制管理。通信单元803用于支持装置800与其他网络实体的通信。装置800还可以包括存储单元801，用于存储装置800的程序代码和数据。
其中，处理单元802可以是处理器或控制器，例如可以是通用中央处理器(central processing unit，CPU)，通用处理器，数字信号处理(digital signal processing，DSP)，专用集成电路(application specific integrated circuits，ASIC)，现场可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本发明实施例公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包括一个或多个微处理器组合，DSP和微处理器的组合等等。通信单元803可以是通信接口、收发器或收发电路等，其中，该通信接口是统称，在具体实现中，该通信接口可以包括多个接口。存储单元801可以是存储器。
在第一种应用中，该装置800可以为上述任一实施例中的接入网设备，还可以为接入网设备中的芯片。例如，当装置800为接入网设备时，该处理单元802例如可以是处理器，该通信单元例如可以是收发器，该收发器包括射频电路，可选地，该存储单元例如可以是存储器。例如，当装置800为接入网设备中的芯片时，该处理单元802例如可以是处理器，该通信单元例如可以是输入/输出接口、管脚或电路等。该处理单元802可执行存储单元存储的计算机执行指令，可选地，该存储单元为该芯片内的存储单元，如寄存器、缓存等，该存储单元还可以是该接入网设备内的位于该芯片外部的存储单元，如只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)等。
具体地，当通信单元803包括发送单元和接收单元时：处理单元，用于与N个时钟域的时钟源分别进行时钟同步；发送单元，用于与所述N个时钟域的时钟源时钟同步完成后，向终端发送N个时钟域的信息，一个时钟域的信息包括时钟域的第一时间信息和时钟域号，第一时间信息包括接入网设备发送时钟域的信息时时钟域的时钟源的时间，时钟域号用于标识时钟域，N为大于1的整数。
在一种可能的实现方式中，时钟域的信息还包括接入网设备的本地时钟与时钟域的时钟源之间的频率偏差值比。
在一种可能的实现方式中，发送单元，具体用于：发送广播信息，广播信息包括N个时钟域的信息；或者，向终端发送单播信息，单播信息包括N个时钟域的信息；或者，向终端发送N个单播信息，一个单播信息包括N个时钟域中的一个时钟域的信息。
在一种可能的实现方式中，接收单元，用于在发送单元向终端发送N个时钟域的信息之前，接收终端或核心网网元发送的N个时钟域的时钟域号。
在第二种应用中，该装置800可以为上述任一实施例中的终端，还可以为终端中的芯片。例如，装置800可以为终端时，该处理单元802例如可以是处理器，该通信单元例如可以是收发器，该收发器包括射频电路，可选地，该存储单元例如可以是存储器。例如，装置800可以为终端中的芯片时，该处理单元802例如可以是处理器，该通信单元例如可以是输入/输出接口、管脚或电路等。可选地，该存储单元为该芯片内的存储单元，如寄存器、缓存等，该存储单元还可以是该终端内的位于该芯片外部的存储单元，如ROM或可 存储静态信息和指令的其他类型的静态存储设备，RAM等。
具体地，当通信单元803包括发送单元和接收单元时，在第一个实施例中，接收单元，用于接收接入网设备发送的N个时钟域的信息，一个时钟域的信息包括时钟域的第一时间信息和时钟域号，第一时间信息包括接入网设备发送时钟域的信息时时钟域的时钟源的时间，时钟域号用于标识时钟域，N为大于1的整数；处理单元，用于确定N个时钟域中的装置关联的M个时钟域，M为正整数；以及，根据M个时钟域的信息，分别与M个时钟域的时钟源进行时钟同步。
在一种可能的实现方式中，时钟域的信息还包括接入网设备的本地时钟与时钟域的时钟源之间的频率偏差值比。
在一种可能的实现方式中，接收单元，具体用于：接收接入网设备发送的广播信息，广播信息包括N个时钟域的信息；或者，接收接入网设备发送的单播信息，单播信息包括N个时钟域的信息；或者，接收接入网设备发送的N个单播信息，一个单播信息包括N个时钟域中的一个时钟域的信息。
在一种可能的实现方式中，处理单元，用于确定N个时钟域中的终端关联的M个时钟域，具体包括：在会话的建立流程中，从核心网网元获取终端关联的M个时钟域的时钟域号，其中，核心网网元存储有终端的标识与M个时钟域的时钟域号的关联关系；其中，终端的标识包括以下一种或多种：终端的GPSI、会话关联的IP地址、终端关联的至少MAC地址。
在一种可能的实现方式中，处理单元，用于确定N个时钟域中的终端关联的M个时钟域，具体包括：从核心网网元获取终端关联的M个时钟域的时钟域号，核心网网元包括数据管理网元或者策略控制网元；其中，核心网网元存储有终端的签约信息与终端关联的M个时钟域的时钟域号的关联关系，或者，核心网网元存储有终端的签约信息且签约信息包括M个时钟域的时钟域号。
在一种可能的实现方式中，处理单元，还用于在接收单元接收接入网设备发送的N个时钟域的信息之前，与接入网设备进行定时提前测量，得到定时提前，该定时提前为终端与接入网设备之间的传输时延。
在一种可能的实现方式中，处理单元，用于根据M个时钟域的信息与M个时钟域的时钟源进行时钟同步，具体包括：针对M个时钟域的第i时钟域，根据第i时钟域的信息和定时提前，确定第i时钟域的第二时间信息，第二时间信息包括终端接收到接入网设备发送第i时钟域的信息时第i时钟域的时钟源的时间，i取遍1至M。
在第二个实施例中，发送单元，用于向接入网设备发送终端关联的M个时钟域的时钟域号，M为正整数；接收单元，用于接收接入网设备发送的与M个时钟域号对应的M个时钟域的信息，一个时钟域的信息包括时钟域的第一时间信息和时钟域号，第一时间信息包括接入网设备发送时钟域的信息时时钟域的时钟源的时间，时钟域号用于标识时钟域，N为大于1的整数；处理单元，用于根据M个时钟域的信息，分别与M个时钟域的时钟源进行时钟同步。
在一种可能的实现方式中，时钟域的信息还包括接入网设备的本地时钟与时钟域的时钟源之间的频率偏差值比。
在一种可能的实现方式中，接收单元，具体用于：接收接入网设备发送的广播信息，广播信息包括M个时钟域的信息；或者，接收接入网设备发送的单播信息，单播信息包括 M个时钟域的信息；或者，接收接入网设备发送的M个单播信息，一个单播信息包括M个时钟域中的一个时钟域的信息。
在一种可能的实现方式中，处理单元，还用于在发送单元向接入网设备发送终端关联的M个时钟域的时钟域号之前，确定终端关联的M个时钟域。
在一种可能的实现方式中，处理单元，用于确定终端关联的M个时钟域，具体包括：在会话的建立流程中，从核心网网元获取终端关联的M个时钟域的时钟域号，其中，核心网网元存储有终端的标识与M个时钟域的时钟域号的关联关系；其中，终端的标识包括以下一种或多种：终端的GPSI、会话关联的IP地址、终端关联的至少一个MAC地址。
在一种可能的实现方式中，处理单元，用于确定终端关联的M个时钟域，具体包括：从核心网网元获取终端关联的M个时钟域的时钟域号，核心网网元包括数据管理网元或者策略控制网元；其中，核心网网元存储有终端的签约信息与终端关联的M个时钟域的时钟域号的关联关系，或者，核心网网元存储有终端的签约信息且签约信息包括M个时钟域的时钟域号。
在一种可能的实现方式中，处理单元，还用于在接收单元接收接入网设备发送的M个时钟域的信息之前，与接入网设备进行定时提前测量，得到定时提前，定时提前用于确定终端与接入网设备之间的传输时延。
在一种可能的实现方式中，处理单元，用于根据M个时钟域的信息与M个时钟域的时钟源进行时钟同步，具体包括：针对M个时钟域的第i时钟域，根据第i时钟域的信息和定时提前，确定第i时钟域的第二时间信息，第二时间信息包括终端接收到接入网设备发送第i时钟域的信息时，第i时钟域的时钟源的时间，i取遍1至M。
在第三种应用中，该装置800可以为上述任一实施例中的会话管理网元，还可以为会话管理网元中的芯片。例如，装置800可以为会话管理网元时，该处理单元802例如可以是处理器，该通信单元例如可以是收发器，该收发器包括射频电路，可选地，该存储单元例如可以是存储器。例如，装置800可以为会话管理网元中的芯片时，该处理单元802例如可以是处理器，该通信单元例如可以是输入/输出接口、管脚或电路等。可选地，该存储单元为该芯片内的存储单元，如寄存器、缓存等，该存储单元还可以是该会话管理网元内的位于该芯片外部的存储单元，如ROM或可存储静态信息和指令的其他类型的静态存储设备，RAM等。
具体地，当通信单元803包括发送单元和接收单元时：接收单元，用于接收来自终端的会话请求消息；发送单元，用于向认证授权计费设备发送认证授权请求消息，认证授权请求消息包括终端的标识；接收单元，还用于接收认证授权计费设备发送的M个时钟域的时钟域号，M个时钟域为终端关联的时钟域，M个时钟域的时钟域号与终端的标识存在关联关系；发送单元，还用于向终端发送M个时钟域的时钟域号。其中，终端的标识包括以下一种或多种：终端的GPSI、会话关联的IP地址、终端关联的至少一个MAC地址。
在第四种应用中，该装置800可以为上述任一实施例中的数据管理网元，还可以为数据管理网元中的芯片。例如，装置800可以为数据管理网元时，该处理单元802例如可以是处理器，该通信单元例如可以是收发器，该收发器包括射频电路，可选地，该存储单元例如可以是存储器。例如，装置800可以为数据管理网元中的芯片时，该处理单元802例如可以是处理器，该通信单元例如可以是输入/输出接口、管脚或电路等。可选地，该存储单元为该芯片内的存储单元，如寄存器、缓存等，该存储单元还可以是该数据管理网元内 的位于该芯片外部的存储单元，如ROM或可存储静态信息和指令的其他类型的静态存储设备，RAM等。
具体地，当通信单元803包括发送单元和接收单元时：处理单元，用于获取终端的签约信息；以及根据终端的签约信息，确定终端关联的M个时钟域的时钟域号。发送单元，用于向终端发送M个时钟域的时钟域号。其中，数据管理网元存储有终端的签约信息与终端关联的M个时钟域的时钟域号的关联关系，或者，数据管理网元存储有终端的签约信息且签约信息包括M个时钟域的时钟域号。
在第五种应用中，该装置800可以为上述任一实施例中的策略控制网元，还可以为策略网元控制中的芯片。例如，装置800可以为策略控制网元时，该处理单元802例如可以是处理器，该通信单元例如可以是收发器，该收发器包括射频电路，可选地，该存储单元例如可以是存储器。例如，装置800可以为策略控制网元中的芯片时，该处理单元802例如可以是处理器，该通信单元例如可以是输入/输出接口、管脚或电路等。可选地，该存储单元为该芯片内的存储单元，如寄存器、缓存等，该存储单元还可以是该策略控制网元内的位于该芯片外部的存储单元，如ROM或可存储静态信息和指令的其他类型的静态存储设备，RAM等。
具体地，当通信单元803包括发送单元和接收单元时：处理单元，用于生成策略信息，策略信息包括终端签约的应用对应的M个时钟域的时钟域号。发送单元，用于向终端发送策略信息。
在一种可能的实现方式中，策略信息包括终端签约的应用对应的M个时钟域的时钟域号；则处理单元，还用于在生成策略信息之前，从数据存储网元获取终端的签约信息，签约信息包括终端签约的应用，以及确定终端签约的应用对应的M个时钟域的时钟域号。
图8所示的装置为终端、或为接入网设备、或为会话管理网元、或为数据管理网元、或为策略控制网元时，所用于执行的时钟同步方法、或时钟域的确定方法的具体有益效果，可参考前述方法实施例中的相关描述，这里不再赘述。
图9示出了本发明实施例中所涉及的终端的一种可能的设计结构的简化示意图。所述终端900包括发射器901，接收器902和处理器903。其中，处理器903也可以为控制器，图9中表示为“控制器/处理器903”。可选的，所述终端900还可以包括调制解调处理器905，其中，调制解调处理器905可以包括编码器906、调制器907、解码器908和解调器909。
在一个示例中，发射器901调节(例如，模拟转换、滤波、放大和上变频等)输出采样并生成上行链路信号，该上行链路信号经由天线发射给上述实施例中所述的接入网设备。在下行链路上，天线接收上述实施例中接入网设备发射的下行链路信号。接收器902调节(例如，滤波、放大、下变频以及数字化等)从天线接收的信号并提供输入采样。在调制解调处理器905中，编码器906接收要在上行链路上发送的业务数据和信令消息，并对业务数据和信令消息进行处理(例如，格式化、编码和交织)。调制器907进一步处理(例如，符号映射和调制)编码后的业务数据和信令消息并提供输出采样。解调器909处理(例如，解调)该输入采样并提供符号估计。解码器908处理(例如，解交织和解码)该符号估计并提供发送给终端900的已解码的数据和信令消息。编码器906、调制器907、解调器909和解码器908可以由合成的调制解调处理器905来实现。这些单元根据无线接入网采用的无线 接入技术来进行处理。需要说明的是，当终端900不包括调制解调处理器905时，调制解调处理器905的上述功能也可以由处理器903完成。
处理器903对终端900进行控制管理，用于执行上述本发明实施例中由终端进行的处理过程。例如，处理器903用于执行本申请任一实施例的时钟同步方法中涉及终端的处理过程和/或本申请所描述的技术方案的其他过程。
进一步的，终端900还可以包括存储器904，存储器904用于存储用于终端900的程序代码和数据。
图10示出了本发明实施例提供的接入网设备的一种可能的结构示意图。接入网设备1000包括处理器1002和通信接口1004。其中，处理器1002也可以为控制器，图10中表示为“控制器/处理器1002”。通信接口1004用于支持接入网设备与终端进行通信。进一步的，接入网设备1000还可以包括发射器/接收器1001。所述发射器/接收器1001用于支持接入网设备与上述实施例中的终端之间进行无线电通信。所述处理器1002可以执行各种用于与终端通信的功能。在上行链路，来自终端的上行链路信号经由天线接收，由接收器1001进行解调(例如将高频信号解调为基带信号)，并进一步由处理器1002进行处理来恢复终端发送的业务数据和信令信息。在下行链路上，业务数据和信令消息由处理器1002进行处理，并由发射器1001进行调制(例如将基带信号调制为高频信号)来产生下行链路信号，并经由天线发射给终端。需要说明的是，上述解调或调制的功能也可以由处理器1002完成。
例如，处理器1002还用于执行本申请实施例中的任一时钟同步方法中涉及接入网设备的处理过程和/或本申请所描述的技术方案的其他过程。
进一步的，接入网设备1000还可以包括存储器1003，存储器1003用于存储接入网设备1000的程序代码和数据。
可以理解的是，图10仅仅示出了接入网设备1000的简化设计。在实际应用中，接入网设备1000可以包括任意数量的发射器，接收器，处理器，控制器，存储器，通信单元等，而所有可以实现本发明实施例的接入网设备都在本发明实施例的保护范围之内。
参阅图11所示，为本申请提供的一种装置示意图，该装置可以是上述会话管理网元、或数据管理网元、或策略控制网元。该装置1100包括：处理器1102、通信接口1103、存储器1101。可选的，装置1100还可以包括总线1104。其中，通信接口1103、处理器1102以及存储器1101可以通过通信线路1104相互连接；通信线路1104可以是外设部件互连标准(peripheral component interconnect，简称PCI)总线或扩展工业标准结构(extended industry standard architecture，简称EISA)总线等。所述通信线路1104可以分为地址总线、数据总线、控制总线等。为便于表示，图11中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
处理器1102可以是一个CPU，微处理器，ASIC，或一个或多个用于控制本申请方案程序执行的集成电路。
通信接口1103，使用任何收发器一类的装置，用于与其他设备或通信网络通信，如以太网，无线接入网(radio access network，RAN)，无线局域网(wireless local area networks，WLAN)，有线接入网等。
存储器1101可以是只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically er服务器able programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。存储器可以是独立存在，通过通信线路1104与处理器相连接。存储器也可以和处理器集成在一起。
其中，存储器1101用于存储执行本申请方案的计算机执行指令，并由处理器1102来控制执行。处理器1102用于执行存储器1101中存储的计算机执行指令，从而实现本申请上述实施例提供的时钟域的确定方法。
可选的，本申请实施例中的计算机执行指令也可以称之为应用程序代码，本申请实施例对此不作具体限定。
本领域普通技术人员可以理解：本申请中涉及的第一、第二等各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围，也表示先后顺序。“和/或”，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。字符“/”一般表示前后关联对象是一种“或”的关系。“至少一个”是指一个或者多个。至少两个是指两个或者多个。“至少一个”、“任意一个”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a,b,或c中的至少一项(个、种)，可以表示：a,b,c,a-b,a-c,b-c,或a-b-c，其中a,b,c可以是单个，也可以是多个。
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。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包括一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘(Solid State Disk，SSD))等。
本申请实施例中所描述的各种说明性的逻辑单元和电路可以通过通用处理器，数字信号处理器，专用集成电路(ASIC)，现场可编程门阵列(FPGA)或其它可编程逻辑装置，离散门或晶体管逻辑，离散硬件部件，或上述任何组合的设计来实现或操作所描述的功能。通用处理器可以为微处理器，可选地，该通用处理器也可以为任何传统的处理器、控制器、微控制器或状态机。处理器也可以通过计算装置的组合来实现，例如数字信号处理器和微处理器，多个微处理器，一个或多个微处理器联合一个数字信号处理器核，或任何其它类 似的配置来实现。
本申请实施例中所描述的方法或算法的步骤可以直接嵌入硬件、处理器执行的软件单元、或者这两者的结合。软件单元可以存储于RAM存储器、闪存、ROM存储器、EPROM存储器、EEPROM存储器、寄存器、硬盘、可移动磁盘、CD-ROM或本领域中其它任意形式的存储媒介中。示例性地，存储媒介可以与处理器连接，以使得处理器可以从存储媒介中读取信息，并可以向存储媒介存写信息。可选地，存储媒介还可以集成到处理器中。处理器和存储媒介可以设置于ASIC中，ASIC可以设置于终端中。可选地，处理器和存储媒介也可以设置于终端中的不同的部件中。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包括这些改动和变型在内。

Claims (28)

  1. 一种时钟同步方法，其特征在于，包括：
    终端接收接入网设备发送的N个时钟域的信息，一个时钟域的信息包括所述时钟域的第一时间信息和时钟域号，所述第一时间信息包括所述接入网设备发送所述时钟域的信息时所述时钟域的时钟源的时间，所述时钟域号用于标识所述时钟域，N为大于1的整数；
    所述终端确定所述N个时钟域中的所述终端关联的M个时钟域，M为大于1的整数；
    所述终端根据所述M个时钟域的信息，分别与所述M个时钟域的时钟源进行时钟同步。
  2. 如权利要求1所述的方法，其特征在于，所述时钟域的信息还包括所述接入网设备的本地时钟与所述时钟域的时钟源之间的频率偏差值比。
  3. 如权利要求1或2所述的方法，其特征在于，所述终端接收接入网设备发送的N个时钟域的信息，包括：
    所述终端接收所述接入网设备发送的广播信息，所述广播信息包括所述N个时钟域的信息；或者，
    所述终端接收所述接入网设备发送的单播信息，所述单播信息包括所述N个时钟域的信息；或者，
    所述终端接收所述接入网设备发送的N个单播信息，一个单播信息包括所述N个时钟域中的一个时钟域的信息。
  4. 如权利要求1至3任一项所述的方法，其特征在于，所述终端确定所述N个时钟域中的所述终端关联的M个时钟域，包括：
    在会话的建立流程中，所述终端从核心网网元获取所述终端关联的M个时钟域的时钟域号，其中，所述核心网网元存储有所述终端的标识与所述M个时钟域的时钟域号的关联关系；
    其中，所述终端的标识包括以下一种或多种：
    所述终端的通用公共签约标识GPSI；
    所述会话关联的IP地址；
    所述终端关联的至少一个媒体接入控制MAC地址。
  5. 如权利要求1至3任一项所述的方法，其特征在于，所述终端确定所述N个时钟域中的所述终端关联的M个时钟域，包括：
    所述终端从核心网网元获取所述终端关联的M个时钟域的时钟域号，所述核心网网元包括数据管理网元或者策略控制网元；
    其中，所述核心网网元存储有所述终端的签约信息与所述终端关联的M个时钟域的时钟域号的关联关系，或者，所述核心网网元存储有所述终端的签约信息且所述签约信息包括所述M个时钟域的时钟域号。
  6. 如权利要求1至5所述的方法，其特征在于，所述终端接收接入网设备发送的N个时钟域的信息之前，包括：
    所述终端与所述接入网设备进行定时提前测量，得到定时提前值，所述定时提前值用于确定所述终端与所述接入网设备之间的传输时延。
  7. 如权利要求6所述的方法，其特征在于，所述终端根据所述M个时钟域的信息与 所述M个时钟域的时钟源进行时钟同步，包括：
    针对所述M个时钟域的第i时钟域，所述终端根据所述第i时钟域的信息和所述定时提前值，确定所述第i时钟域的第二时间信息，所述第二时间信息包括所述终端接收到所述接入网设备发送所述第i时钟域的信息时所述第i时钟域的时钟源的时间，i取遍1至M。
  8. 一种时钟同步方法，其特征在于，包括：
    接入网设备与N个时钟域的时钟源分别进行时钟同步；
    所述接入网设备与所述N个时钟域的时钟源时钟同步完成后，向终端发送所述N个时钟域的信息，一个时钟域的信息包括所述时钟域的第一时间信息和时钟域号，所述第一时间信息包括所述接入网设备发送所述时钟域的信息时所述时钟域的时钟源的时间，所述时钟域号用于标识所述时钟域，N为大于1的整数。
  9. 如权利要求8所述的方法，其特征在于，所述时钟域的信息还包括所述接入网设备的本地时钟与所述时钟域的时钟源之间的频率偏差值比。
  10. 如权利要求8或9所述的方法，其特征在于，所述接入网设备向所述终端发送所述N个时钟域的信息，包括：
    所述接入网设备发送广播信息，所述广播信息包括所述N个时钟域的信息；或者，
    所述接入网设备向所述终端发送单播信息，所述单播信息包括所述N个时钟域的信息；或者，
    所述接入网设备向所述终端发送N个单播信息，一个单播信息包括所述N个时钟域中的一个时钟域的信息。
  11. 如权利要求8至10任一项所述的方法，其特征在于，所述接入网设备向终端发送所述N个时钟域的信息之前，还包括：
    所述接入网设备接收所述终端或核心网网元发送的所述N个时钟域的时钟域号。
  12. 一种装置，其特征在于，包括：
    接收单元，用于接收接入网设备发送的N个时钟域的信息，一个时钟域的信息包括所述时钟域的第一时间信息和时钟域号，所述第一时间信息包括所述接入网设备发送所述时钟域的信息时所述时钟域的时钟源的时间，所述时钟域号用于标识所述时钟域，N为大于1的整数；
    处理单元，用于确定所述N个时钟域中的所述装置关联的M个时钟域，M为大于1的整数；以及，根据所述M个时钟域的信息，分别与所述M个时钟域的时钟源进行时钟同步。
  13. 如权利要求12所述的装置，其特征在于，所述时钟域的信息还包括所述接入网设备的本地时钟与所述时钟域的时钟源之间的频率偏差值比。
  14. 如权利要求12或13所述的装置，其特征在于，所述接收单元，具体用于：
    接收所述接入网设备发送的广播信息，所述广播信息包括所述N个时钟域的信息；或者，
    接收所述接入网设备发送的单播信息，所述单播信息包括所述N个时钟域的信息；或者，
    接收所述接入网设备发送的N个单播信息，一个单播信息包括所述N个时钟域中的一个时钟域的信息。
  15. 如权利要求12至14任一项所述的装置，其特征在于，所述处理单元，用于确定 所述N个时钟域中的所述装置关联的M个时钟域，具体包括：
    在会话的建立流程中，从核心网网元获取所述装置关联的M个时钟域的时钟域号，其中，所述核心网网元存储有所述装置的标识与所述M个时钟域的时钟域号的关联关系；
    其中，所述装置的标识包括以下一种或多种：
    所述装置的通用公共签约标识GPSI；
    所述会话关联的IP地址；
    所述装置关联的至少一个媒体接入控制MAC地址。
  16. 如权利要求12至14任一项所述的装置，其特征在于，所述处理单元，用于确定所述N个时钟域中的所述装置关联的M个时钟域，具体包括：
    从核心网网元获取所述装置关联的M个时钟域的时钟域号，所述核心网网元包括数据管理网元或者策略控制网元；
    其中，所述核心网网元存储有所述装置的签约信息与所述装置关联的M个时钟域的时钟域号的关联关系，或者，所述核心网网元存储有所述装置的签约信息且所述签约信息包括所述M个时钟域的时钟域号。
  17. 如权利要求12至16所述的装置，其特征在于，所述处理单元，还用于在所述接收单元接收接入网设备发送的N个时钟域的信息之前，与所述接入网设备进行定时提前测量，得到定时提前值，所述定时提前值用于确定所述装置与所述接入网设备之间的传输时延。
  18. 如权利要求17所述的装置，其特征在于，所述处理单元，用于根据所述M个时钟域的信息与所述M个时钟域的时钟源进行时钟同步，具体包括：
    针对所述M个时钟域的第i时钟域，根据所述第i时钟域的信息和所述定时提前值，确定所述第i时钟域的第二时间信息，所述第二时间信息包括所述装置接收到所述接入网设备发送所述第i时钟域的信息时所述第i时钟域的时钟源的时间，i取遍1至M。
  19. 一种装置，其特征在于，包括：
    处理单元，用于与N个时钟域的时钟源分别进行时钟同步；
    发送单元，用于与所述N个时钟域的时钟源时钟同步完成后，向终端发送所述N个时钟域的信息，一个时钟域的信息包括所述时钟域的第一时间信息和时钟域号，所述第一时间信息包括所述装置发送所述时钟域的信息时所述时钟域的时钟源的时间，所述时钟域号用于标识所述时钟域，N为大于1的整数。
  20. 如权利要求19所述的装置，其特征在于，所述时钟域的信息还包括所述接入网设备的本地时钟与所述时钟域的时钟源之间的频率偏差值比。
  21. 如权利要求19或20所述的装置，其特征在于，所述发送单元，具体用于：
    发送广播信息，所述广播信息包括所述N个时钟域的信息；或者，
    向所述终端发送单播信息，所述单播信息包括所述N个时钟域的信息；或者，
    向所述终端发送N个单播信息，一个单播信息包括所述N个时钟域中的一个时钟域的信息。
  22. 如权利要求19至21任一项所述的装置，其特征在于，所述装置还包括接收单元，用于在所述发送单元向终端发送所述N个时钟域的信息之前，接收所述终端或核心网网元发送的所述N个时钟域的时钟域号。
  23. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质包括指令，当 所述指令在计算机上运行时，使得计算机执行如权利要求1到7任一项所述的方法。
  24. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质包括指令，当所述指令在计算机上运行时，使得计算机执行如权利要求8到11任一项所述的方法。
  25. 一种包含指令的计算机程序产品，其特征在于，当其在计算机上运行时，使得计算机执行如权利要求1到7任一项所述的方法。
  26. 一种包含指令的计算机程序产品，其特征在于，当其在计算机上运行时，使得计算机执行如权利要求8到11任一项所述的方法。
  27. 一种通信装置，其特征在于，所述通信装置包括存储器以及与所述存储器耦合的处理器；
    所述存储器中保存有程序指令，当所述处理器执行所述程序指令时，使得所述通信装置执行上述权利要求1-7任一项所述的方法。
  28. 一种通信装置，其特征在于，所述通信装置包括存储器以及与所述存储器耦合的处理器；
    所述存储器中保存有程序指令，当所述处理器执行所述程序指令时，使得所述通信装置执行上述权利要求8-11任一项所述的方法。
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