WO2023024864A1 - 会话重建的方法、装置和系统 - Google Patents

会话重建的方法、装置和系统 Download PDF

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Publication number
WO2023024864A1
WO2023024864A1 PCT/CN2022/110184 CN2022110184W WO2023024864A1 WO 2023024864 A1 WO2023024864 A1 WO 2023024864A1 CN 2022110184 W CN2022110184 W CN 2022110184W WO 2023024864 A1 WO2023024864 A1 WO 2023024864A1
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WIPO (PCT)
Prior art keywords
network element
session
network
information
recovery time
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PCT/CN2022/110184
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English (en)
French (fr)
Inventor
黄亚超
肖方强
张卓阳
丁辉
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华为技术有限公司
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Publication of WO2023024864A1 publication Critical patent/WO2023024864A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections

Definitions

  • the present application relates to the communication field, and more specifically, to a method, device and system for session reestablishment
  • the policy control network element can send network element update information to the session management network element or the access and mobility management network element, which is used for the session management network element or the access and mobility management network element to perform session reestablishment.
  • the present application provides a method, device and system for session re-establishment, which are helpful for fast and accurate session re-establishment.
  • a method for reestablishing a session including: a first network element receives network element information from a network storage function network element and a second network element, the network element information includes session characteristic information, and the session characteristic information is used to indicate The affected session between the first network element and the second network element; the first network element performs session re-establishment with the second network element according to the session feature information.
  • the affected sessions include but are not limited to lost sessions and sessions with abnormal follow-up messages.
  • the network element with the network storage function can send the network element information of the second network element to the first network element, and the network element information includes session feature information, and the first network element can determine the first network element according to the session feature information.
  • the affected session between the network element and the second network element so as to quickly and accurately perform session re-establishment.
  • the session characteristic information includes at least one of the following: data network name DNN, network slice selection auxiliary information NSSAI, and public land mobile network identifier (PLMN ID).
  • the above network element information also includes a first recovery time, and the first network element performs session reestablishment with the second network element according to the session feature information, including: the first network element Perform session re-establishment with the second network element according to the session feature information and the first recovery time.
  • the above method further includes: the first network element determines that the second network element fails according to the first recovery time and the second recovery time, and the second recovery time is the local Saved, the failure of the second network element includes the failure of the second network element itself and/or the failure of the link between the second network element and the application function network element.
  • the above method further includes: the first network element subscribes to the network element with the network storage function the network element information of the second network element.
  • the second network element is a policy control network element, and the first network element is an access and mobility management network element, a session management network element, or a network opening network element;
  • the second network element is a unified data management network element, and the first network element is an access and mobility management network element, a session management network element, a short message service network element or an authentication server network element; or, the second network element is The unified data storage network element, the first network element is a unified data management network element, a policy control network element or a network open network element.
  • a method for reestablishing a session which is characterized in that it includes: a second network element sends network element information to a network storage function network element, the network element information includes session characteristic information, and the session characteristic information is used to indicate the second The affected session between the network element and the first network element; the second network element reestablishes the session with the first network element according to the session feature information.
  • the network element with the network storage function can send the network element information of the second network element to the first network element, and the network element information includes session feature information, and the first network element can determine the first network element according to the session feature information.
  • the affected session between the network element and the second network element so as to quickly and accurately perform session re-establishment.
  • the above-mentioned session feature information includes at least one of the following: data network name DNN, network slice selection assistance information NSSAI, and public land mobile network identifier PLMN ID.
  • the above network element information also includes the first recovery time, and the second network element performs session reestablishment with the first network element according to the session feature information, including: the second network element Perform session re-establishment with the first network element according to the session feature information and the first recovery time.
  • the above method further includes: the second network element determines that the second network element itself fails and/or the link between the second network element and the application function network element malfunction.
  • the above method further includes: the second network element registers the network element information of the second network element with the network storage function network element, and the network element information includes the second recovery time, The second recovery time is saved locally.
  • the second network element is a policy control network element
  • the first network element is an access and mobility management network element, a session management network element, or a network opening network element
  • the second network element is a unified data management network element
  • the first network element is an access and mobility management network element, a session management network element, a short message service network element or an authentication server network element; or,
  • the second network element is a unified data storage network element
  • the first network element is a unified data management network element, a policy control network element or a network open network element.
  • a device for reestablishing a session is provided to implement the above method.
  • the session reestablishment apparatus may be the first network element entity in the above first aspect, or an apparatus including the above first network element entity.
  • the session reconstruction device includes corresponding modules, units, or means (means) for realizing the above method, and the modules, units, or means can be implemented by hardware, software, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • the session reestablishment apparatus may include a processing module and a sending and receiving module.
  • the transceiver module which may also be referred to as a transceiver unit, is configured to implement the sending and/or receiving functions in the above first aspect and any possible implementation manners thereof.
  • the transceiver module can be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface.
  • the processing module may be used to implement the processing functions in the above first aspect and any possible implementation manners thereof.
  • the processing module may be, for example, a processor.
  • the above-mentioned session reestablishment apparatus includes: a receiving unit, configured to receive network element information from a second network element of a network storage function network element, and the network element information includes session Feature information, the session feature information is used to indicate the affected session between the first network element and the second network element; the processing unit is used to perform session reestablishment with the second network element according to the session feature information.
  • the above-mentioned session feature information includes at least one of the following: data network name DNN, network slice selection assistance information NSSAI, and public land mobile network identifier PLMN ID.
  • the network element information further includes the first recovery time
  • the processing unit is specifically configured to perform session re-establishment with the second network element according to the session characteristic information and the first recovery time.
  • the processing unit is further configured to determine that the second network element fails according to the first recovery time and the second recovery time, and the second recovery time is saved locally,
  • the failure of the second network element includes the failure of the second network element itself and/or the failure of the link between the second network element and the application function network element.
  • the transceiver unit is further configured to subscribe to the network element with the network storage function the network element information of the second network element.
  • the second network element is a policy control network element
  • the first network element is an access and mobility management network element, a session management network element, or a network opening network element;
  • the second network element is a unified data management network element
  • the first network element is an access and mobility management network element, a session management network element, a short message service network element or an authentication server network element; or,
  • the second network element is a unified data storage network element
  • the first network element is a unified data management network element, a policy control network element or a network open network element.
  • the transceiver module includes a sending module and a receiving module, respectively configured to implement the sending and receiving functions in any of the above aspects and any possible implementation manners thereof.
  • an apparatus for reestablishing a session is provided to implement the above method.
  • the session reestablishment apparatus may be the second network element entity in the above second aspect, or an apparatus including the above second network element entity.
  • the session reconstruction device includes corresponding modules, units, or means (means) for realizing the above method, and the modules, units, or means can be implemented by hardware, software, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • the apparatus for reestablishing a session may include a processing module and a sending and receiving module.
  • the transceiver module which may also be referred to as a transceiver unit, is configured to implement the sending and/or receiving functions in the second aspect and any possible implementation manners thereof.
  • the transceiver module may be composed of a transceiver circuit, a transceiver, a transceiver or a communication interface.
  • the processing module may be used to implement the processing functions in the above second aspect and any possible implementation manners thereof.
  • the processing module may be, for example, a processor.
  • the above-mentioned session reestablishment device includes: a transceiver unit, configured to send the network element information of the second network element to the network storage function network element, and the network element information includes session characteristics information, the session feature information is used to indicate the affected session between the second network element and the first network element; the processing unit is used to perform session reestablishment with the first network element according to the session feature information.
  • the session feature information includes at least one of the following: data network name DNN, network slice selection auxiliary information NSSAI, and public land mobile network identifier PLMN ID.
  • the network element information further includes the first recovery time
  • the processing unit is specifically configured to perform session re-establishment with the first network element according to the session feature information and the first recovery time.
  • the processing unit is further configured to determine that the second network element itself fails and/or the link between the second network element and the application function network element fails.
  • the transceiver unit is further configured to register the network element information of the second network element with the network storage function network element, and the network element information includes the second recovery time, the second recovery time The time is saved locally.
  • the second network element is a policy control network element
  • the first network element is an access and mobility management network element, a session management network element, or a network opening network element;
  • the second network element is a unified data management network element
  • the first network element is an access and mobility management network element, a session management network element, a short message service network element or an authentication server network element; or,
  • the second network element is a unified data storage network element
  • the first network element is a unified data management network element, a policy control network element or a network open network element.
  • a session reestablishment device including: a processor; the processor is configured to be coupled with a memory, and after reading an instruction in the memory, execute the method according to any one of the above aspects according to the instruction.
  • the session reestablishment device may be the first network element entity in the above first aspect, or a device that includes the above first network element entity; or, the session reestablishment device may be the second network element entity in the above second aspect, or An apparatus including the above-mentioned second network element entity.
  • the session reconstruction apparatus further includes a memory, where the memory is configured to store necessary program instructions and data.
  • the session reconstruction apparatus is a chip or a chip system.
  • the session reconstruction device when it is a system-on-a-chip, it may consist of a chip, or may include a chip and other discrete devices.
  • a session reconstruction device including: a processor and an interface circuit; the interface circuit is used to receive a computer program or instruction and transmit it to the processor; the processor is used to execute the computer program or instruction to enable the session reconstruction
  • the device executes the method in the first aspect or the second aspect above.
  • the session reconstruction apparatus is a chip or a chip system.
  • the session reconstruction device when it is a system-on-a-chip, it may consist of a chip, or may include a chip and other discrete devices.
  • a communication system including the above-mentioned first network element and second network element.
  • the second network element is used to send network element information
  • the network element information includes session characteristic information
  • the session characteristic information is used to indicate the session affected by the second network element and the first network element
  • the first network element is used to receive the network element information, and perform session reestablishment with the second network element according to the session feature information.
  • system further includes a network storage function network element
  • the network storage function network element is used to receive the network element information from the second network element; send the network element information to the first network element, the network element information includes session feature information, and the session feature information is used to indicate that the second network element is connected with the Sessions affected by the first network element.
  • a computer program product includes: computer program code, when the computer program code is run on a computer, it causes the computer to execute the methods in the above aspects.
  • a computer-readable medium stores program codes, and when the computer program codes run on a computer, the computer executes the methods in the above aspects.
  • a chip system including a memory and a processor, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the communication device installed with the chip system executes the above-mentioned Any aspect from the first aspect to the fourth aspect and a method in a possible implementation thereof.
  • the chip system may include an input chip or interface for sending information or data, and an output chip or interface for receiving information or data.
  • FIG. 1 is a schematic diagram of a system architecture according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of an example of a communication system to which this application is applied.
  • FIG. 3 is a schematic diagram of an example of a service architecture of a 5G system applicable to the present application.
  • Fig. 4 is a schematic flowchart of an example of the session reestablishment method of the present application.
  • Fig. 5 is a schematic flowchart of a specific example of the session reestablishment method of the present application.
  • Fig. 6 is another schematic flowchart of a specific example of the session reestablishment method of the present application.
  • Fig. 7 shows a schematic structural diagram of an example of a session reestablishment device of the present application.
  • FIG. 8 shows a schematic structural diagram of an example of a session reconstruction device of the present application.
  • FIG. 1 is a schematic diagram of a communication system provided by this application.
  • the system includes a first network element 110 and a second network element 120 .
  • the system 100 may further include a network storage function network element 130 .
  • the system 100 can be used to implement a session reestablishment method in the embodiment of the present application.
  • the second network element 120 is configured to send network element information, where the network element information includes session characteristic information, and the session characteristic information is used to indicate an affected session between the second network element 120 and the first network element 110 .
  • the first network element 110 is configured to receive network element information, and perform session reestablishment with the second network element according to the session characteristic information.
  • the network storage function network element 130 is configured to receive network element information from the second network element 110; send the network element information to the first network element, where the network element information includes session characteristic information, and the session characteristic information is used to indicate that the second network element The affected session between the second network element 120 and the first network element 110 .
  • the network element with the network storage function may send the network element information of the second network element to the first network element, where the network element information includes session characteristic information, and the first network element may The information determines the affected session between the first network element and the second network element, thereby quickly and accurately performing session re-establishment.
  • the system 100 shown in FIG. 1 can be applied to the fifth generation (5th generation, 5G) network architecture shown in FIG. 2 or FIG.
  • the network architecture and the like are not specifically limited in this embodiment of the present application.
  • the above-mentioned second network element may be a policy control network element (policy control function, PCF), and the first network element may be Access and mobility management network element (access and mobility management function, AMF), session management network element (session management function, SMF) or network exposure function (network exposure function, NEF); or, the above-mentioned second network element may As a unified data management network element (unified data management, UDM), the first network element may be an access and mobility management network element AMF, a session management network element SMF, a short message service network element (short message service function, SMSF) or Authentication server network element (authentication server function, AUSF); or, the above-mentioned second network element may be a unified data storage network element (unified data repository, UDR), and the first network element may be a unified data management network element UDM, a policy control network Element PCF or Network Open
  • FIG. 2 shows a schematic diagram of a basic 5G system 200 architecture.
  • the system 200 includes: PCF, AMF, session management function SMF, radio access network (radio access network, RAN), unified data management UDM, data network (data network, DN), user plane function (user plane function, UPF), UE, application function (application function, AF), and/or unified data storage UDR.
  • the following functions may also be included in FIG. 2 (not shown in FIG. 2 ): network slice selection function (network slice selection function, NSSF), authentication server function AUSF, network opening function NEF, or network storage function NRF.
  • each network element the main functions of each network element are described as follows:
  • the terminal equipment in the embodiment of the present application may be: user equipment (user equipment, UE), mobile station (mobile station, MS), mobile terminal (mobile terminal, MT), access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.
  • user equipment user equipment
  • MS mobile station
  • MT mobile terminal
  • access terminal subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.
  • a terminal device may be a device that provides voice/data connectivity to users, for example, a handheld device with a wireless connection function, a vehicle-mounted device, and the like.
  • some terminals are: mobile phone (mobile phone), tablet computer, notebook computer, palmtop computer, mobile internet device (mobile internet device, MID), wearable device, virtual reality (virtual reality, VR) device, enhanced Augmented reality (AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving or autopilot, wireless terminals in remote medical surgery, smart grid ( Wireless terminals in smart grid, wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home, cellular phones, cordless phones, session initiation protocol (session initiation protocol, SIP) telephones, wireless local loop (wireless local loop, WLL) stations, personal digital assistants (personal digital assistant, PDA), handheld devices with wireless communication capabilities, computing devices, or other devices connected to wireless modems Processing devices, vehicle-mounted devices, wearable devices, terminal devices in the future 5G network or terminal devices
  • the terminal device may also be a wearable device.
  • Wearable devices can also be called wearable smart devices, which is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction.
  • the terminal device may also be a terminal device in an Internet of Things (Internet of Things, IoT) system.
  • IoT Internet of Things
  • the wireless access network is an access network that realizes access network functions based on wireless communication technology.
  • the wireless access network can manage wireless resources, provide wireless access or air interface access services for terminals, and then complete the forwarding of control signals and user data between terminals and the core network.
  • the radio access network may be an evolved base station (evolved NodeB, eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario , or the access device can be a relay station, an access point, a vehicle-mounted device, a wearable device, an access device in a 5G network or an access device in a future evolved PLMN network, etc., and can be an access point in a WLAN ( The access point, AP), may be the gNB in the NR system.
  • This embodiment of this application is not limited.
  • Access and mobility management function network elements are mainly used for mobility management and access management, etc., and can be used to implement functions other than session management in mobility management entity (mobility management entity, MME) functions, for example, legal Functions such as monitoring, or access authorization (or authentication), are also used to transfer user policies between UE and PCF. In the embodiment of the present application, it can be used to implement functions of access and mobility management network elements.
  • mobility management entity mobility management entity, MME
  • legal Functions such as monitoring, or access authorization (or authentication)
  • PCF access authorization
  • it can be used to implement functions of access and mobility management network elements.
  • Session management function network elements are mainly used for session management, network interconnection protocol (internet protocol, IP) address allocation and management of terminal equipment, selection and management of user plane function (user plane function, UPF) network elements, policy control and charging functions
  • IP network interconnection protocol
  • UPF user plane function
  • the user plane functional network element can be used for packet routing and forwarding, or QoS parameter processing of user plane data, etc.
  • User data can be accessed to a data network (data network, DN) through this network element.
  • DN data network
  • it can be used to implement the functions of the user plane network element. For example, when a session is established on a different UPF, the service experience of the UE will be different. Therefore, the above-mentioned SMF is required to select a suitable UPF for the session of the UE.
  • the policy control network element is used to guide the unified policy framework of network behavior, and provide policy rule information, etc. for the control plane functional network elements (such as AMF, SMF network elements, etc.). It is mainly responsible for policy control functions such as charging for sessions and service flow levels, QoS bandwidth guarantee, mobility management, and UE policy decision-making.
  • the PCFs connected to AMF and SMF correspond to AM PCF (PCF for Access and Mobility Control) and SM PCF (PCF for Session Management) respectively, and in actual deployment scenarios, they can be the same PCF entity, or they can be Yes are two different PCF entities.
  • the network capability opening function network element is used to open the service and network capability information provided by the 3GPP network function to the outside (such as the location of the terminal, whether the session is reachable), etc.
  • the application function network element is mainly used to transmit the requirements from the application side to the network side, for example, QoS requirements or user status event subscription.
  • the AF may be a third-party functional entity, or an application service deployed by an operator, such as an IMS voice call service.
  • the application function entity of the third-party application it can also perform authorization processing through NEF when interacting with the core network.
  • the third-party application function directly sends a request message to NEF, and NEF judges whether the AF is allowed to send the request message. If passed, the request message will be forwarded to the corresponding PCF or UDM.
  • the unified data management network element is mainly used for unified data management, supporting authentication and trust status processing in the 3GPP authentication and key agreement mechanism, user identity processing, access authorization, registration and mobility management, subscription management, short message management, etc.
  • the unified data storage network element is mainly used for the access function of contract data, policy data, application data and other types of data.
  • the data network refers to a specific data service network accessed by the UE.
  • a typical DN includes the Internet and an IP multimedia subsystem (IP multimedia subsystem, IPMS).
  • IP multimedia subsystem IP multimedia subsystem
  • N7 The interface between PCF and SMF, which is used to deliver PDU session granularity and service data flow granularity control policies.
  • N15 the interface between the PCF and the AMF, used to issue UE policies and access control related policies.
  • N5 The interface between the AF and the PCF, used for delivering application service requests and reporting network events.
  • N4 The interface between SMF and UPF, which is used to transfer information between the control plane and the user plane, including controlling the distribution of forwarding rules, QoS control rules, and traffic statistics rules for the user plane, as well as the information reporting of the user plane.
  • N11 The interface between the SMF and the AMF, used to transfer the PDU session tunnel information between the RAN and the UPF, the control message sent to the UE, the radio resource control information sent to the RAN, etc.
  • N2 The interface between the AMF and the RAN, used to transfer radio bearer control information from the core network side to the RAN.
  • N1 The interface between the AMF and the UE, which has nothing to do with access, and is used to deliver QoS control rules to the UE.
  • N8 The interface between AMF and UDM, which is used for AMF to obtain subscription data and authentication data related to access and mobility management from UDM, and for AMF to register UE current mobility management related information with UDM.
  • N10 The interface between SMF and UDM, which is used for SMF to obtain session management-related subscription data from UDM, and for SMF to register UE current session-related information with UDM.
  • N35 interface between UDM and UDR, used for UDM to obtain user subscription data information from UDR.
  • N36 the interface between PCF and UDR, used for PCF to obtain policy-related subscription data and application data-related information from UDR.
  • N52 The interface between UDM and NEF, which is used for NEF to open network capabilities to third-party application functions.
  • third-party application functions subscribe to UDM through NEF to reachability events of all users in a specific group.
  • NEF also has direct interfaces with AMF and SMF, corresponding to N29 interface and N51 interface respectively (to simplify the illustration, not shown in the above figure), which is used to open the operator's network capabilities to third-party application function entities, the former can be used
  • AMF application management function
  • SMF packet flow description
  • the above-mentioned network architecture applied to the embodiment of the present application is only an example of a network architecture described from the perspective of a traditional point-to-point architecture and a service-oriented architecture, and the network architecture applicable to the embodiment of the present application is not limited thereto. Any network architecture capable of implementing the functions of the foregoing network elements is applicable to this embodiment of the present application.
  • the name of the interface between network elements in FIG. 2 is just an example, and the name of the interface in a specific implementation may be another name, which is not specifically limited in this application.
  • the name of the message (or signaling) transmitted between the above network elements is only an example, and does not constitute any limitation on the function of the message itself.
  • the foregoing network element may also be called an entity, device, device, or module, which is not specifically limited in this application. Moreover, in this application, for the convenience of understanding and explanation, the description of the network element is omitted in some descriptions.
  • the SMF network element is referred to as SMF.
  • the "SMF” should be understood as the SMF network element. The following , omitting descriptions for the same or similar situations.
  • the above-mentioned network element or function may be a network element in a hardware device, a software function running on dedicated hardware, or a virtualization function instantiated on a platform (for example, a cloud platform).
  • a platform for example, a cloud platform.
  • the foregoing network element or function may be implemented by one device, or jointly implemented by multiple devices, or may be a functional module in one device, which is not specifically limited in this embodiment of the present application.
  • each component network element is only exemplary, and not all functions of each component network element are required when applied in the embodiment of the present application.
  • each network element such as PCF, AMF, etc.
  • the above-mentioned network elements may also have other names, which are not specifically limited in this embodiment of the present application.
  • some or all of the above-mentioned network elements may use the terms in 5G, or may be named by other names, etc., which will be described in a unified manner here, and will not be described in detail below.
  • each network element of the control plane function in Figure 2 can also communicate through a service interface, for example, the service interface provided by AMF can be Namf; the service interface provided by SMF can be Nsmf; The service interface provided externally can be Nudm, the service interface provided by AF can be Naf; the service interface provided by PCF can be Npcf and so on.
  • AMF can be Namf
  • SMF can be Nsmf
  • the service interface provided externally can be Nudm
  • the service interface provided by AF can be Naf
  • the service interface provided by PCF can be Npcf and so on.
  • FIG. 2 shows a schematic diagram of the architecture based on the service interface.
  • the architecture includes: NSSF, AUSF, UDM, NEF, NRF, PCF, AF, AMF, SMF, UE, RAN, UPF, DN.
  • the service interface provided by NSSF can be Nnssf
  • the service interface provided by NEF can be Nnef
  • the service interface provided by NRF can be Nnrf
  • the service interface provided by AMF can be Namf
  • SMF The service interface provided by UDM can be Nsmf
  • the service interface provided by UDM can be Nudm
  • the service interface provided by AF can be Naf
  • the service interface provided by PCF can be Npcf
  • the service interface provided by AUSF can be Nausf
  • the service interface provided by CHF can be Nchf
  • the interface between the control plane function and RAN and UPF is a non-service interface.
  • the UE is connected to the AMF through the N1 interface, the UE is connected to the RAN through the radio resource control (RRC) protocol; the RAN is connected to the AMF through the N2 interface, and the RAN is connected to the UPF through the N3 interface; the UPF is connected to the DN through the N6 interface, and at the same time , UPF is connected with SMF through N4 interface.
  • RRC radio resource control
  • the general session establishment process can be simply described as: UE sends a session establishment request to AMF through RAN, AMF selects SMF to provide services for the session, saves the correspondence between SMF and PDU session, and stores the session
  • the establishment request is sent to the SMF, and the SMF selects a corresponding UPF for the UE, establishes a user plane transmission path, and assigns an IP address to it.
  • the SMF will also initiate a policy control session establishment request to the PCF for establishing a policy control session between the SMF and the PCF.
  • the SMF will save the correspondence between the policy control session and the PDU session .
  • the AF can also establish an AF session with the PCF, and the PCF binds the AF session and the policy control session.
  • the PCF when the PCF goes online, it can send a registration request (for example, an NFRegister message) to the NRF, and the request message will carry its own network element information, namely NFProfile.
  • the recovery time recoveryTime may also be included to indicate the service recovery time stamp.
  • the SMF interacts with the PCF for the first time, it can also subscribe to the NRF for the service status change of the PCF, so that the NRF can notify the SMF of the information when it determines that the network element information of the PCF changes.
  • PCF network elements When PCF network elements experience equipment failure, network withdrawal, load balancing (partial contract data migration to new equipment), etc., the session established between PCF and SMF may be affected. In more serious cases, PCF will lose the current session. information.
  • a current technology is that after PCF restarts, such as failure restart, planned restart, and data cutover restart, etc., it can send an updated update message to NRF through a registration message (for example, NFRegister message) or an update message (for example, NFUpdate message).
  • the network element information namely NFprofile, the network element information includes the updated recoveryTime, which is used to indicate the updated service recovery time stamp.
  • the NRF determines that the recoveryTime in the network element information of the PCF has changed, and then sends the updated network element information to the SMF network elements that have subscribed to the PCF service status.
  • SMF judges based on the received recoveryTime that the session before this time needs to adopt a recovery mechanism, and then triggers the corresponding mechanism, such as deactivating the user session and triggering the user to rebuild the session.
  • the PCF can only indicate that the SMF has failed to restart, relocate, or upgrade by carrying the updated recoveryTime.
  • sessions lost in actual network failures and relocation scenarios are usually at the DNN granularity or slice granularity, and only the target DNN Or sliced user sessions are affected.
  • the PCF migrates the Internet DNN session, the IP multimedia system (IP multimedia subsystem, IMS) DNN session on the old PCF is not affected, so the SMF does not need to trigger the session reconstruction process of the IMS DNN session.
  • each notification will trigger the reconstruction process of all user sessions under the PCF, which will cause a huge waste of signaling to the core network.
  • the present application proposes a method for session re-establishment, in order to accurately perceive the session state of a faulty network element, and perform session re-establishment quickly and accurately.
  • Fig. 4 shows a schematic flowchart of an example of the session reestablishment method of the present application.
  • the session reestablishment method 400 is applied to the network architecture shown in FIG. 2 or FIG. 3 above.
  • the first network element receives the network element information of the second network element from the network storage function network element, the network element information includes session feature information, and the session feature information is used to indicate that the relationship between the first network element and the second network element is affected session.
  • the session feature information includes at least one of the following: data network name DNN, network slice selection auxiliary information NSSAI, and public land mobile network identifier PLMN ID.
  • the above network element information also includes a first recovery time, and the first network element performs session reestablishment with the second network element according to the session feature information, including: the first network element communicates with the second network element according to the session feature information and the first recovery time The network element reestablishes the session.
  • the above method further includes: the first network element determines that the second network element fails according to the first recovery time and the second recovery time, the second recovery time is saved locally, and the failure of the second network element includes the second The network element itself fails and/or the link between the second network element and the application function network element fails.
  • the above method further includes: the first network element subscribes the network element information of the second network element to the network storage function network element.
  • the second network element is a policy control network element
  • the first network element is an access and mobility management network element, a session management network element or a network opening network element
  • the second network element is a unified data management network element
  • the first network element is an access and mobility management network element, a session management network element, a short message service network element or an authentication server network element
  • the second network element is a unified data storage network element
  • the first network element is a unified Data management network element, policy control network element or network open network element.
  • the first network element performs session reestablishment with the second network element according to the session feature information.
  • the network element with the network storage function can send the network element information of the second network element to the first network element, and the network element information includes session feature information, and the first network element can determine the first network element according to the session feature information.
  • the affected session between the network element and the second network element so as to quickly and accurately perform session re-establishment.
  • Fig. 5 is a schematic flowchart of a specific example of the session reestablishment method of the present application.
  • the first network element (also called the client) can accurately perceive the second network element (also called the server) when the second network element (also called the server) has a server failure, data loss, abnormality and other scenarios. Called the server) lost or abnormal sessions, targeted session reconstruction.
  • the second network element sends registered network element information to the network warehouse function network element NRF.
  • the second network element may send a registration request (for example, an NFRegister message) to the NRF, and the request message will carry its own network element information, that is, NFProfile, and the network element information may also include a second recovery time recoveryTime2, used To indicate the service recovery timestamp.
  • a registration request for example, an NFRegister message
  • the request message will carry its own network element information, that is, NFProfile
  • the network element information may also include a second recovery time recoveryTime2, used To indicate the service recovery timestamp.
  • the first network element subscribes to the network element information of the second network element from the network warehouse function network element NRF.
  • the first network element when interacting with the second network element for the first time, may subscribe to the service state change of the second network element from the network warehouse function network element NRF, so that the network warehouse function network element NRF can determine the status of the second network element.
  • the network element information changes, the information is notified to the first network element.
  • the first network element establishes a session with the second network element.
  • the second network element determines that its own network element is faulty.
  • the second network element's determination of its own network element failure may include the second network element's equipment failure, network withdrawal, etc.
  • it may also include other possible self-network element failures. This application is not correct It defines.
  • the second network element sends the network element information of the second network element to the network warehouse function network element NRF.
  • the second network element can send updated network element information, namely NFprofile, to the NRF through a registration message (for example, NFRegister message) or an update message (for example, NFUpdate message), and the updated network element
  • the information includes session characteristic information, and the session characteristic information is used to indicate an affected session between the first network element and the second network element.
  • the session feature information includes at least one of the following: data network name DNN, network slice selection auxiliary information NSSAI, and public land mobile network identifier PLMN ID.
  • the updated network element information may also include an updated recovery time, which may be referred to as a first recovery time recoveryTime1, to indicate an updated service recovery time stamp.
  • the network warehouse function network element NRF sends the network element information of the second network element to the first network element.
  • the network warehouse function network element NRF may determine that the first recovery time is different from the locally saved second recovery time according to the updated recovery time included in the updated network element information, that is, the first recovery time recoveryTime1, thereby determining The network element information of the second network element is changed. Further, the updated network element information of the second network element is sent to the first network element that has subscribed to the service state of the second network element, where the updated network element information includes the above session feature information.
  • the first network element performs session reestablishment with the second network element according to the session characteristic information.
  • the first network element can quickly and accurately determine the affected session according to the data network name DNN in the session characteristic information, the network slice selection auxiliary information NSSAI, and the public land mobile network identifier PLMN ID, so as to perform session reestablishment.
  • the data network name DNN in the session characteristic information the network slice selection auxiliary information NSSAI, and the public land mobile network identifier PLMN ID.
  • the second network element may be a policy control network element PCF
  • the first network element may be an access and mobility management network element AMF, a session management network element SMF, or a network opening network element NEF
  • the second network element may be a unified data management network element UDM
  • the first network element is an access and mobility management network element AMF, a session management network element SMF, a short message service network element SMSF or an authentication server network element AUSF
  • the second The network element may be a unified data storage network element UDR
  • the first network element is a unified data management network element UDM, a policy control network element PCF or a network open network element NEF.
  • the session reconstruction refers to the access management/session management policy association AM/SM Policy Association reconstruction; when the second network element is the unified data management network element UDM, the session The reconstruction may be a context reconstruction.
  • the network element with the network storage function can send the network element information of the second network element to the first network element, and the network element information includes session feature information, and the first network element can determine the first network element according to the session feature information.
  • the affected session between the network element and the second network element so as to quickly and accurately perform session re-establishment.
  • Fig. 6 is another schematic flowchart of a specific example of the session reestablishment method of the present application.
  • the link failure between the second network element and the application function network element AF will affect the voice call for a long time, and the first network element (also called the client) can accurately perceive the second network element. If the second network element (also known as the server) loses or has an abnormal session, the session is rebuilt in a targeted manner to ensure that subsequent voice calls are normal.
  • This solution is also applicable to non-voice call scenarios, and this application does not limit it, and its specific process is similar to the following method, which will not be repeated here.
  • S610, S620, and S630 are the same as S510, S520, and S530, and will not be repeated here.
  • the voice call fails, that is, the Rx message or the N5 message of the voice call cannot be delivered to the second network element, resulting in voice damage.
  • the Rx message corresponds to the scenario where the Diameter protocol is used between the IMS AF and the PCF
  • the N5 message corresponds to the scenario where the hypertext transfer protocol (HTTP) protocol is used between the IMS AF and the PCF.
  • HTTP hypertext transfer protocol
  • the second network element determines that the link with the application function AF is faulty.
  • the second network element sends the network element information of the second network element to the network warehouse function network element NRF.
  • the second network element can send updated network element information, namely NFprofile, to the NRF through a registration message (for example, NFRegister message) or an update message (for example, NFUpdate message), and the updated network element
  • the information includes session characteristic information, and the session characteristic information is used to indicate an affected session between the first network element and the second network element.
  • the session feature information includes at least one of the following: data network name DNN, network slice selection auxiliary information NSSAI, and public land mobile network identifier PLMN ID.
  • the network element information can also be used to instruct to delete the IMS DNN corresponding to the voice session, so that the first network element points the newly online IMS session to an updated second network element, avoiding the establishment of a new IMS session on the unused On the updated second NE, subsequent calls fail.
  • the updated network element information may also include an updated recovery time, which may be referred to as a first recovery time recoveryTime1, to indicate an updated service recovery time stamp.
  • the network warehouse function network element NRF sends the network element information of the second network element to the first network element.
  • the network warehouse function network element NRF may determine that the first recovery time is different from the locally saved second recovery time according to the updated recovery time included in the updated network element information, that is, the first recovery time recoveryTime1, thereby determining The network element information of the second network element is changed. Further, the updated network element information of the second network element is sent to the first network element that has subscribed to the service state of the second network element, where the updated network element information includes the above session feature information.
  • the first network element performs session reestablishment with the second network element according to the session feature information.
  • the first network element can quickly and accurately determine the affected session according to the data network name DNN, network slice selection auxiliary information NSSAI, and public land mobile network identifier PLMN ID in the session feature information, so as to perform session reestablishment.
  • the first network element can determine the affected session according to the IMS DNN, and perform session reconstruction without affecting the network Internet data session.
  • the provisions in the current agreement which will not be introduced in this application.
  • the first network element matches the updated second network element according to the session feature information and the updated second network element.
  • the network element performs session re-establishment to prevent a new IMS session from being established on the unupdated second network element, resulting in subsequent call failure.
  • first network element and second network element may respectively represent multiple network elements, and the specific situation may refer to the description in FIG. 5 , and details are not repeated here for brevity.
  • the network element with the network storage function can send the network element information of the second network element to the first network element, and the network element information includes session feature information, and the first network element can determine the first network element according to the session feature information.
  • the affected session between the network element and the second network element so as to quickly and accurately perform session re-establishment.
  • sequence numbers of the above processes do not mean the order of execution, and the execution order of each process should be determined by its functions and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.
  • the method implemented by the communication device may also be implemented by a component (such as a chip or a circuit) that can be configured inside the communication device.
  • each network element includes a corresponding hardware structure and/or software module for performing each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.
  • the embodiment of the present application can divide the functional modules of the transmitting end device or the receiving end device according to the above method example, for example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module middle.
  • the above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. It should be noted that the division of modules in the embodiment of the present application is schematic, and is only a logical function division, and there may be other division methods in actual implementation. In the following, description will be made by taking the division of each functional module corresponding to each function as an example.
  • Fig. 7 shows a schematic structural diagram of an example of a session reestablishment device of the present application.
  • Any network element involved in any one of the methods 400 to 600 above, such as the first network element and the second network element, can be implemented by the session reestablishment device shown in FIG. 7 .
  • the session reestablishment device 700 may be a physical device, or a component of the physical device (for example, an integrated circuit, a chip, etc.), or a functional module in the physical device.
  • the session reestablishment device 700 includes: one or more processors 710 .
  • the processor 710 may store execution instructions for executing the methods of the embodiments of the present application.
  • the processor 710 may call an interface to implement receiving and sending functions.
  • the interface may be a logical interface or a physical interface, which is not limited.
  • the interface may be a transceiver circuit, or an interface circuit.
  • the transceiver circuit or interface circuit used to realize the receiving and sending functions can be separated or integrated together.
  • the above-mentioned transceiver circuit or interface circuit can be used for reading and writing code/data, or the above-mentioned transceiver circuit or interface circuit can be used for signal transmission or transfer.
  • the interface can be implemented through a transceiver.
  • the session reestablishment device 700 may further include a transceiver 730 .
  • the transceiver 730 may be called a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and is used to implement a transceiver function.
  • the session reconstruction device 700 may also include a memory 720 .
  • the embodiment of the present application does not specifically limit the specific deployment location of the memory 720, and the memory may be integrated in the processor or independent of the processor.
  • the session reestablishment apparatus 700 does not include a memory, it is sufficient that the session reestablishment device 700 has a processing function, and the memory can be deployed in other locations (for example, a cloud system).
  • the processor 710, the memory 720 and the transceiver 730 communicate with each other through internal connection paths, and transmit control and/or data signals.
  • the session reconstruction device 700 may also include other devices, such as an input device, an output device, a battery, and the like.
  • the memory 720 may store execution instructions for executing the methods of the embodiments of the present application.
  • the processor 710 can execute the instructions stored in the memory 720 in conjunction with other hardware (such as the transceiver 730 ) to complete the steps of the method shown below.
  • other hardware such as the transceiver 730
  • Processor 710 may be an integrated circuit chip with signal processing capabilities.
  • each step of the method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software.
  • the above-mentioned processor can be a general-purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), an off-the-shelf programmable gate array (field programmable gate array, FPGA) or other available Program logic devices, discrete gate or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.
  • the steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in random access memory (random access memory, RAM), flash memory, read-only memory (read-only memory, ROM), programmable read-only memory or electrically erasable programmable memory, registers, etc. in the storage medium.
  • the storage medium is located in the memory, and the processor reads the instructions in the memory, and completes the steps of the above method in combination with its hardware.
  • memory 720 can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory.
  • the non-volatile memory can be read-only memory ROM, programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically erasable programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • Volatile memory can be random access memory RAM, which acts as external cache memory.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • SDRAM double data rate synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM direct memory bus random access memory
  • direct rambus RAM direct rambus RAM
  • FIG. 8 shows a schematic structural diagram of an example of a session reconstruction device of the present application.
  • the specific form of the session reconstruction apparatus 800 may be a general-purpose computer device or a chip in a general-purpose computer device, which is not limited in this embodiment of the present application.
  • the session reestablishment apparatus includes a processing unit 810 and a transceiver unit 820 .
  • the session reestablishment apparatus 800 may be any network element involved in this application, and may implement functions that the network element can implement. It should be understood that the session reestablishment apparatus 800 may be a physical device, or a component of the physical device (for example, an integrated circuit, a chip, etc.), or a functional module in the physical device.
  • the session reestablishment apparatus 800 may be the first network element device in the above method embodiment, or may be a chip for realizing the function of the first network element device in the above method embodiment.
  • the transceiving unit 820 is configured to receive network element information from a second network element of a network storage function network element, where the network element information includes session feature information, and the session feature information is used to indicate that the first network element and the Affected session between the second network element; a processing unit 810, configured to perform session re-establishment with the second network element according to the session feature information.
  • the transceiving unit 810 is specifically configured to reestablish a session with the second network element according to the session feature information and the first recovery time.
  • the processing unit 810 is further configured to determine that the second network element fails according to the first recovery time and the second recovery time, the second recovery time is saved locally, and the second network element The failure includes that the second network element itself fails and/or the link between the second network element and the application function network element fails.
  • the transceiving unit 820 is further configured to subscribe the network element information of the second network element to the network storage function network element.
  • the transceiver unit 820 in the session reestablishment apparatus 800 may be implemented through a communication interface (such as a transceiver or an input/output interface), and the session reestablishment apparatus 800 in The processing unit 810 may be implemented by at least one processor, for example, may correspond to the processor 710 shown in FIG. 7 .
  • the session reconstruction apparatus 800 may further include a storage unit, which may be used to store instructions or data, and the processing unit may call the instructions or data stored in the storage unit to implement corresponding operations.
  • a storage unit which may be used to store instructions or data
  • the processing unit may call the instructions or data stored in the storage unit to implement corresponding operations.
  • the session reestablishment apparatus 800 may be the second network element device in the above method embodiment, or may be a chip for realizing the function of the second network element in the above method embodiment.
  • the transceiver unit 820 is configured to send the network element information of the second network element to the network storage function network element, where the network element information includes session characteristic information, and the session characteristic information is used to indicate that the second network element and the second network element An affected session between network elements; a processing unit 810, configured to reestablish a session with the first network element according to the session characteristic information.
  • the processing unit 810 is specifically configured to reestablish a session with the first network element according to the session feature information and the first recovery time.
  • processing unit 810 is further configured to determine that the second network element itself fails and/or the link between the second network element and the application function network element fails.
  • the transceiver unit 820 is further configured to register the network element information of the second network element with the network storage function network element, the network element information includes a second recovery time, and the second recovery time saved locally.
  • the transceiver unit 820 in the session reestablishment device 800 can be implemented through a communication interface (such as a transceiver or an input/output interface), for example, it can correspond to the The communication interface 730 is shown, and the processing unit 810 in the session reconstruction apparatus 800 may be implemented by at least one processor, for example, may correspond to the processor 710 shown in FIG. 7 .
  • the session reconstruction apparatus 800 may further include a storage unit, which may be used to store instructions or data, and the processing unit may call the instructions or data stored in the storage unit to implement corresponding operations.
  • a storage unit which may be used to store instructions or data
  • the processing unit may call the instructions or data stored in the storage unit to implement corresponding operations.
  • the apparatus 800 can also be used to implement functions of network elements such as SMF and AMF in the above method embodiments, wherein the transceiver unit 820 can be used to implement operations related to receiving and sending, and the processing unit 810 can be used to implement operations other than For other operations other than receiving and sending, refer to the descriptions in the above method embodiments for details, and will not be listed here one by one.
  • the session reconstruction apparatus 800 is presented in the form of functional modules.
  • the “module” here may refer to an application-specific integrated circuit ASIC, a circuit, a processor and memory executing one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above-mentioned functions.
  • the apparatus 800 may take the form shown in FIG. 8 .
  • the processing unit 810 may be implemented by the processor 710 shown in FIG. 7 .
  • the computer device shown in FIG. 7 includes a memory 720
  • the processing unit 810 may be implemented by the processor 710 and the memory 720 .
  • the transceiver unit 820 may be implemented by the transceiver 730 shown in FIG.
  • the transceiver 730 includes a receiving function and a sending function.
  • the processor is implemented by executing computer programs stored in the memory.
  • the function and/or implementation process of the transceiver unit 820 may also be implemented through pins or circuits.
  • the memory may be a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit located outside the chip in the computer device, as shown in FIG. 7
  • the memory 720 alternatively, may also be a storage unit deployed in other systems or devices, not in the computer device.
  • Computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disk, floppy disk, or tape, etc.), optical disks (e.g., compact disc (compact disc, CD), digital versatile disc (digital versatile disc, DVD) etc.), smart cards and flash memory devices (for example, erasable programmable read-only memory (EPROM), card, stick or key drive, etc.).
  • magnetic storage devices e.g., hard disk, floppy disk, or tape, etc.
  • optical disks e.g., compact disc (compact disc, CD), digital versatile disc (digital versatile disc, DVD) etc.
  • smart cards and flash memory devices for example, erasable programmable read-only memory (EPROM), card, stick or key drive, etc.
  • various storage media described herein can represent one or more devices and/or other machine-readable media for storing information.
  • the term "machine-readable medium” may include, but is not limited to, wireless channels and various other media capable of storing, containing and/or carrying instructions and/or data.
  • the present application also provides a computer program product, the computer program product including: computer program code, when the computer program code is run on the computer, the computer is made to execute the computer program described in Fig. 4 to Fig. 6 .
  • the method of any one of the embodiments is illustrated.
  • the present application also provides a computer-readable medium, the computer-readable medium stores program codes, and when the program codes are run on a computer, the computer is made to perform the operations shown in Fig. 4 to Fig. 6 .
  • the method of any one of the embodiments is illustrated.
  • the present application further provides a system, which includes the foregoing apparatus or equipment.
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, 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 such as a server or a data center integrated with one or more available media.
  • the available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk (solid state disc, SSD)) etc.
  • a magnetic medium for example, a floppy disk, a hard disk, a magnetic tape
  • an optical medium for example, a high-density digital video disc (digital video disc, DVD)
  • a semiconductor medium for example, a solid state disk (solid state disc, SSD)
  • a component may be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer.
  • an application running on a computing device and the computing device can be components.
  • One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between two or more computers.
  • these components can execute from various computer readable media having various data structures stored thereon.
  • a component may, for example, be based on a signal having one or more packets of data (e.g., data from two components interacting with another component between a local system, a distributed system, and/or a network, such as the Internet via a signal interacting with other systems). Communicate through local and/or remote processes.
  • packets of data e.g., data from two components interacting with another component between a local system, a distributed system, and/or a network, such as the Internet via a signal interacting with other systems.
  • the disclosed systems, devices and methods may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disc and other media that can store program codes. .

Abstract

本申请提供了一种会话重建的方法、装置和系统，包括：第一网元接收来自网络存储功能网元的第二网元的网元信息，网元信息包括会话特征信息，会话特征信息用于指示第一网元与第二网元之间受影响的会话；第一网元根据会话特征信息与第二网元进行会话重建。根据本申请的技术方案，网络存储功能网元可以向第一网元发送第二网元的网元信息，该网元信息包括会话特征信息，第一网元可以根据会话特征信息确定第一网元与第二网元之间受影响的会话，从而快速、准确地进行会话重建。

Description

会话重建的方法、装置和系统
本申请要求于2021年8月27日提交中国专利局、申请号为202110996699.1、申请名称为“会话重建的方法、装置和系统”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
本申请涉及通信领域，并且更具体地，涉及一种会话重建的方法、装置和系统
背景技术
当前，在与会话管理网元或接入与移动性管理网元建立会话后，策略控制网元在出现设备故障、退网、负载均衡(部分签约数据迁移至信的设备)等场景下会丢失会话信息，此时，策略控制网元可以向会话管理网元或接入与移动性管理网元发送网元更新信息，用于会话管理网元或接入与移动性管理网元进行会话重建。
但是实际故障中丢失的会话通常以数据网络名称(data network name，DNN)或网络切片选择辅助信息(network slice selection assistance information，NSSAI)为粒度，仅目标DNN或NSSAI用户会话收到影响。上述方法中，每次通知均会触发该策略控制网元下的全量用户会话的重建流程，无法快速、准确地进行会话重建，同时对核心网产生极大的信令浪费。
发明内容
本申请提供一种会话重建的方法、装置和系统，有助于快速、准确地进行会话重建。
第一方面，提供了一种会话重建的方法，包括：第一网元接收来自网络存储功能网元的第二网元的网元信息，网元信息包括会话特征信息，会话特征信息用于指示第一网元与第二网元之间受影响的会话；第一网元根据会话特征信息与第二网元进行会话重建。
其中，受影响的会话包括但不限于丢失的会话以及后续消息有异常的会话。
根据本申请的技术方案，网络存储功能网元可以向第一网元发送第二网元的网元信息，该网元信息包括会话特征信息，第一网元可以根据会话特征信息确定第一网元与第二网元之间受影响的会话，从而快速、准确地进行会话重建。
其中，上述会话特征信息包括以下至少一种：数据网络名称DNN、网络切片选择辅助信息NSSAI和公用陆地移动网络标识(public land mobile network identifier，PLMN ID)。
结合第一方面，在第一方面的某些实现方式中，上述网元信息还包括第一恢复时间，第一网元根据会话特征信息与第二网元进行会话重建，包括：第一网元根据会话特征信息和第一恢复时间与第二网元进行会话重建。
结合第一方面，在第一方面的某些实现方式中，上述方法还包括：第一网元根据第一恢复时间和第二恢复时间，确定第二网元发生故障，第二恢复时间为本地保存的，第二网 元发生故障包括第二网元自身发生故障和/或第二网元与应用功能网元之间的链路发生故障。
结合第一方面，在第一方面的某些实现方式中，上述方法还包括：第一网元向网络存储功能网元订阅第二网元的网元信息。
结合第一方面，在第一方面的某些实现方式中，第二网元为策略控制网元，第一网元为接入与移动性管理网元、会话管理网元或网络开放网元；或者，第二网元为统一数据管理网元，第一网元为接入与移动性管理网元、会话管理网元、短消息业务网元或认证服务器网元；或者，第二网元为统一数据存储网元，第一网元为统一数据管理网元、策略控制网元或网络开放网元。
第二方面，提供了一种会话重建的方法，其特征在于，包括：第二网元向网络存储功能网元发送网元信息，网元信息包括会话特征信息，会话特征信息用于指示第二网元与第一网元之间受影响的会话；第二网元根据会话特征信息与第一网元进行会话重建。
根据本申请的技术方案，网络存储功能网元可以向第一网元发送第二网元的网元信息，该网元信息包括会话特征信息，第一网元可以根据会话特征信息确定第一网元与第二网元之间受影响的会话，从而快速、准确地进行会话重建。
其中，上述会话特征信息包括以下至少一种：数据网络名称DNN、网络切片选择辅助信息NSSAI和公用陆地移动网络标识PLMN ID。
结合第二方面，在第二方面的某些实现方式中，上述网元信息还包括第一恢复时间，第二网元根据会话特征信息与第一网元进行会话重建，包括：第二网元根据会话特征信息和第一恢复时间与第一网元进行会话重建。
结合第二方面，在第二方面的某些实现方式中，上述方法还包括：第二网元确定第二网元自身发生故障和/或第二网元与应用功能网元之间的链路发生故障。
结合第二方面，在第二方面的某些实现方式中，上述方法还包括：第二网元向网络存储功能网元注册第二网元的网元信息，网元信息包括第二恢复时间，第二恢复时间为本地保存的。
结合第二方面，在第二方面的某些实现方式中，第二网元为策略控制网元，第一网元为接入与移动性管理网元、会话管理网元或网络开放网元；或者，
第二网元为统一数据管理网元，第一网元为接入与移动性管理网元、会话管理网元、短消息业务网元或认证服务器网元；或者，
第二网元为统一数据存储网元，第一网元为统一数据管理网元、策略控制网元或网络开放网元。
第三方面，提供了一种会话重建装置用于实现上述方法。该会话重建装置可以为上述第一方面中的第一网元实体，或者包含上述第一网元实体的装置。该会话重建装置包括实现上述方法相应的模块、单元、或手段(means)，该模块、单元、或means可以通过硬件实现，软件实现，或者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或单元。
结合上述第三方面，在一些可能的实现中，该会话重建装置可以包括处理模块和收发模块。该收发模块，也可以称为收发单元，用以实现上述第一方面及其任意可能的实现方式中的发送和/或接收功能。该收发模块可以由收发电路，收发机，收发器或者通信接口 构成。该处理模块，可以用于实现上述第一方面及其任意可能的实现方式中的处理功能。该处理模块例如可以为处理器。
结合第三方面，在第三方面的某些实现方式中，上述会话重建装置，包括：接收单元，用于接收来自网络存储功能网元的第二网元的网元信息，网元信息包括会话特征信息，会话特征信息用于指示第一网元与第二网元之间受影响的会话；处理单元，用于根据会话特征信息与第二网元进行会话重建。
其中，上述会话特征信息包括以下至少一种：数据网络名称DNN、网络切片选择辅助信息NSSAI和公用陆地移动网络标识PLMN ID。
结合第三方面，在第三方面的某些实现方式中，网元信息还包括第一恢复时间，处理单元，具体用于根据会话特征信息和第一恢复时间与第二网元进行会话重建。
结合第三方面，在第三方面的某些实现方式中，处理单元，还用于根据第一恢复时间和第二恢复时间，确定第二网元发生故障，第二恢复时间为本地保存的，第二网元发生故障包括第二网元自身发生故障和/或第二网元与应用功能网元之间的链路发生故障。
结合第三方面，在第三方面的某些实现方式中，收发单元，还用于向网络存储功能网元订阅第二网元的网元信息。
结合第三方面，在第三方面的某些实现方式中，第二网元为策略控制网元，第一网元为接入与移动性管理网元、会话管理网元或网络开放网元；或者，
第二网元为统一数据管理网元，第一网元为接入与移动性管理网元、会话管理网元、短消息业务网元或认证服务器网元；或者，
第二网元为统一数据存储网元，第一网元为统一数据管理网元、策略控制网元或网络开放网元。
结合上述第三方面，在另一些可能的实现中，收发模块包括发送模块和接收模块，分别用于实现上述任一方面及其任意可能的实现方式中的发送和接收功能。
第四方面，提供了一种会话重建装置用于实现上述方法。该会话重建装置可以为上述第二方面中的第二网元实体，或者包含上述第二网元实体的装置。该会话重建装置包括实现上述方法相应的模块、单元、或手段(means)，该模块、单元、或means可以通过硬件实现，软件实现，或者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或单元。
结合上述第四方面，在一些可能的实现中，该会话重建装置可以包括处理模块和收发模块。该收发模块，也可以称为收发单元，用以实现上述第二方面及其任意可能的实现方式中的发送和/或接收功能。该收发模块可以由收发电路，收发机，收发器或者通信接口构成。该处理模块，可以用于实现上述第二方面及其任意可能的实现方式中的处理功能。该处理模块例如可以为处理器。
结合第四方面，在第四方面的某些实现方式中，上述会话重建装置，包括：收发单元，用于向网络存储功能网元发送第二网元的网元信息，网元信息包括会话特征信息，会话特征信息用于指示第二网元与第一网元之间受影响的会话；处理单元，用于根据会话特征信息与第一网元进行会话重建。
其中，会话特征信息包括以下至少一种：数据网络名称DNN、网络切片选择辅助信息NSSAI和公用陆地移动网络标识PLMN ID。
结合第四方面，在第四方面的某些实现方式中，网元信息还包括第一恢复时间，处理单元，具体用于根据会话特征信息和第一恢复时间与第一网元进行会话重建。
结合第四方面，在第四方面的某些实现方式中，处理单元，还用于确定第二网元自身发生故障和/或第二网元与应用功能网元之间的链路发生故障。
结合第四方面，在第四方面的某些实现方式中，收发单元，还用于向网络存储功能网元注册第二网元的网元信息，网元信息包括第二恢复时间，第二恢复时间为本地保存的。
结合第四方面，在第四方面的某些实现方式中，第二网元为策略控制网元，第一网元为接入与移动性管理网元、会话管理网元或网络开放网元；或者，
第二网元为统一数据管理网元，第一网元为接入与移动性管理网元、会话管理网元、短消息业务网元或认证服务器网元；或者，
第二网元为统一数据存储网元，第一网元为统一数据管理网元、策略控制网元或网络开放网元。
第五方面，提供了一种会话重建装置，包括：处理器；该处理器用于与存储器耦合，并读取存储器中的指令之后，根据该指令执行如上述任一方面所述的方法。该会话重建装置可以为上述第一方面中的第一网元实体，或者包含上述第一网元实体的装置；或者，该会话重建装置可以为上述第二方面中的第二网元实体，或者包含上述第二网元实体的装置。
结合上述第五方面，在一种可能的实现方式中，该会话重建装置还包括存储器，该存储器，用于保存必要的程序指令和数据。
结合上述第五方面，在一种可能的实现方式中，该会话重建装置为芯片或芯片系统。可选的，该会话重建装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
第六方面，提供了一种会话重建装置，包括：处理器和接口电路；接口电路，用于接收计算机程序或指令并传输至处理器；处理器用于执行计算机程序或指令，以使该会话重建装置执执行如上述第一方面或第二方面的方法。
结合上述第六方面，在一种可能的实现方式中，该会话重建装置为芯片或芯片系统。可选的，该会话重建装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
第七方面，提供了一种通信系统，包括上述第一网元和第二网元。
其中，第二网元用于发送网元信息，网元信息包括会话特征信息，会话特征信息用于指示第二网元与第一网元受影响的会话；第一网元用于接收网元信息，根据会话特征信息与第二网元进行会话重建。
结合上述第七方面，在一种可能的实现方式中，该系统还包括网络存储功能网元，
其中，网络存储功能网元，用于接收来自第二网元的网元信息；向第一网元发送网元信息，网元信息包括会话特征信息，会话特征信息用于指示第二网元与第一网元受影响的会话。
第八方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码在计算机上运行时，使得计算机执行上述各方面中的方法。
需要说明的是，上述计算机程序代码可以全部或者部分存储在第一存储介质上，其中 第一存储介质可以与处理器封装在一起的，也可以与处理器单独封装，本申请实施例对此不作具体限定。
第九方面，提供了一种计算机可读介质，所述计算机可读介质存储有程序代码，当所述计算机程序代码在计算机上运行时，使得计算机执行上述各方面中的方法。
第十方面，提供了一种芯片系统，包括存储器和处理器，该存储器用于存储计算机程序，该处理器用于从存储器中调用并运行该计算机程序，使得安装有该芯片系统的通信设备执行上述第一方面至第四方面中的任意方面及其可能实现方式中的方法。
其中，该芯片系统可以包括用于发送信息或数据的输入芯片或者接口，以及用于接收信息或数据的输出芯片或者接口。
附图说明
图1是本申请实施例的一种系统架构的示意图。
图2是本申请适用的通信系统的一例示意图。
图3是本申请本申请适用的5G系统的服务化架构的一例示意图。
图4是本申请会话重建方法的一例示意性流程图。
图5是本申请会话重建方法的具体示例的一例示意性流程图。
图6是本申请会话重建方法的具体示例的另一例示意性流程图。
图7示出了本申请会话重建设备的一例示意性结构图。
图8示出了本申请会话重建装置的一例示意性结构图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
图1是本申请提供的一个通信系统的示意图。如图1所示，该系统包括第一网元110和第二网元120。可选地，该系统100还可以包括网络存储功能网元130。系统100可以用于执行本申请实施例的一个会话重建的方法。
第二网元120，用于发送网元信息，网元信息包括会话特征信息，会话特征信息用于指示第二网元120与第一网元110受影响的会话。
第一网元110，用于接收网元信息，根据会话特征信息与第二网元进行会话重建。
可选地，网络存储功能网元130，用于接收来自第二网元110的网元信息；向第一网元发送网元信息，网元信息包括会话特征信息，会话特征信息用于指示第二网元120与第一网元110受影响的会话。
示例性的，根据本申请提供的通信系统，网络存储功能网元可以向第一网元发送第二网元的网元信息，该网元信息包括会话特征信息，第一网元可以根据会话特征信息确定第一网元与第二网元之间受影响的会话，从而快速、准确地进行会话重建。
图1所示的系统100可以应用于图2或图3所示的第五代(5th generation，5G)网络架构中，当然也可以用在未来网络架构，比如第六代(6th generation，6G)网络架构等，本申请实施例对此不作具体限定。
示例性的，假设图1所示的通信系统应用于图2或图3所示5G网络时，上述第二网元可以为策略控制网元(policy control function，PCF)，第一网元可以为接入与移动性管 理网元(access and mobility management function，AMF)、会话管理网元(session management function，SMF)或网络开放网元(network exposure function，NEF)；或者，上述第二网元可以为统一数据管理网元(unified data management，UDM)，第一网元可以为接入与移动性管理网元AMF、会话管理网元SMF、短消息业务网元(short message service function，SMSF)或认证服务器网元(authentication server function，AUSF)；或者，上述第二网元可以为统一数据存储网元(unified data repository，UDR)，第一网元可以为统一数据管理网元UDM、策略控制网元PCF或网络开放网元NEF。
下面将结合图2和图3，举例说明不同场景下的5G系统。应理解，本文中描述的5G系统仅是示例，不应对本申请构成任何限定。
图2示出了一个基本的5G系统200的架构示意图。如图2所示，系统200包括：PCF、AMF、会话管理功能SMF、无线接入网(radio access network，RAN)、统一数据管理UDM、数据网络(data network，DN)、用户面功能(user plane function，UPF)、UE、应用功能(application function，AF)、和/或统一数据存储UDR。可选地，图2中还可以包括以下功能(图2中未示出)：网络切片选择功能(network slice selection function，NSSF)、认证服务器功能AUSF、网络开放功能NEF、或网络存储功能NRF。
其中，各网元主要功能描述如下：
1、终端设备
本申请实施例中的终端设备，可以是：用户设备(user equipment，UE)、移动台(mobile station，MS)、移动终端(mobile terminal，MT)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置等。
终端设备可以是一种向用户提供语音/数据连通性的设备，例如，具有无线连接功能的手持式设备、车载设备等。目前，一些终端的举例为：移动手机(mobile phone)、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备，虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端、无人驾驶(self-driving or autopilot)中的无线终端、远程手术(remote medical surgery)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、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，本申请实施例对此并不限定。
作为示例而非限定，在本申请实施例中，该终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功 能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。此外，在本申请实施例中，终端设备还可以是物联网(internet of things，IoT)系统中的终端设备。
2、无线接入网
无线接入网是基于无线通信技术实现接入网络功能的接入网。无线接入网能够管理无线资源，为终端提供无线接入或者空口接入服务，进而完成控制信号和用户数据在终端和核心网之间的转发。
作为示例而非限定，无线接入网可以是LTE系统中的演进型基站(evolved NodeB，eNB或eNodeB)，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，或者该接入设备可以为中继站、接入点、车载设备、可穿戴设备以及5G网络中的接入设备或者未来演进的PLMN网络中的接入设备等，可以是WLAN中的接入点(access point，AP)，可以是NR系统中的gNB本申请实施例并不限定。
3、接入和移动性管理功能网元
接入和移动性管理功能网元主要用于移动性管理和接入管理等，可以用于实现移动性管理实体(mobility management entity，MME)功能中除会话管理之外的其它功能，例如，合法监听、或接入授权(或鉴权)等功能，此外还用于在UE与PCF之间传递用户策略。在本申请实施例中，可用于实现接入和移动管理网元的功能。
4、会话管理功能网元
会话管理功能网元主要用于会话管理、终端设备的网络互连协议(internet protocol，IP)地址分配和管理、选择可管理用户面功能(user plane function，UPF)网元、策略控制和收费功能接口的终结点以及下行数据通知等。在本申请实施例中，可用于实现会话管理网元的功能。
5、用户面功能网元
用户面功能网元可用于分组路由和转发、或用户面数据的QoS参数处理等。用户数据可通过该网元接入到数据网络(data network，DN)。在本申请实施例中，可用于实现用户面网元的功能，例如，在不同的UPF上建立会话时，UE的业务体验也会不同，因此需要上述SMF为UE的会话选择一个合适UPF。
6、策略控制网元
策略控制网元用于指导网络行为的统一策略框架，为控制平面功能网元(例如AMF，SMF网元等)提供策略规则信息等。主要负责针对会话、业务流级别进行计费、QoS带宽保障及移动性管理、UE策略决策等策略控制功能。在本申请实施例中，AMF与SMF所连接的PCF分别对应AM PCF(PCF for Access and Mobility Control)和SM PCF(PCF for Session Management)，在实际部署场景中可以是同一个PCF实体，也可以是是两个不同的PCF实体。
7、网络能力开放功能网元
网络能力开放功能网元用于向外部开放由3GPP网络功能提供的业务和网络能力信息(如终端位置、会话是否可达)等。
8、应用功能网元
应用功能网元主要用于传递应用侧对网络侧的需求，例如，QoS需求或用户状态事件订阅等。AF可以是第三方功能实体，也可以是运营商部署的应用服务，如IMS语音呼叫业务。对于第三方应用的应用功能实体，其与核心网进行交互时还可经由NEF进行授权处理，例如第三方应用功能直接向NEF发送请求消息，NEF判断该AF是否被允许发送该请求消息，若验证通过，则将转发该请求消息至对应PCF或统一数据管理UDM。
9、统一数据管理网元
统一数据管理网元主要用于统一数据管理，支持3GPP认证和密钥协商机制中的认证信任状态处理，用户身份处理，接入授权，注册和移动性管理，签约管理，短消息管理等。
10、统一数据存储网元
统一数据存储网元主要用于签约数据、策略数据、应用数据等类型数据的存取功能。
11、数据网络
数据网络是指UE接入的某个特定的数据服务网络，例如，典型的DN包括因特网internet、IP多媒体子系统(IP multimedia subsystem，IPMS)。
在上述架构中，各接口功能描述如下：
N7：PCF与SMF之间的接口，用于下发PDU会话粒度以及业务数据流粒度控制策略。
N15：PCF与AMF之间的接口，用于下发UE策略及接入控制相关策略。
N5：AF与PCF之间的接口，用于应用业务请求下发以及网络事件上报。
N4：SMF与UPF之间的接口，用于控制面与用户面之间传递信息，包括控制面向用户面的转发规则、QoS控制规则、流量统计规则等的下发以及用户面的信息上报。
N11：SMF与AMF之间的接口，用于传递RAN和UPF之间的PDU会话隧道信息、传递发送给UE的控制消息、传递发送给RAN的无线资源控制信息等。
N2：AMF与RAN之间的接口，用于传递核心网侧至RAN的无线承载控制信息等。
N1：AMF与UE之间的接口，接入无关，用于向UE传递QoS控制规则等。
N8：AMF与UDM间的接口，用于AMF向UDM获取接入与移动性管理相关签约数据与鉴权数据，以及AMF向UDM注册UE当前移动性管理相关信息等。
N10：SMF与UDM间的接口，用于SMF向UDM获取会话管理相关签约数据，以及SMF向UDM注册UE当前会话相关信息等。
N35：UDM与UDR间的接口，用于UDM从UDR中获取用户签约数据信息。
N36：PCF与UDR间的接口，用于PCF从UDR中获取策略相关签约数据以及应用数据相关信息。
N52：UDM和NEF间的接口，用于NEF向第三方应用功能开放网络能力，如第三方应用功能通过NEF向UDM订阅特定群组中所有用户的可达性事件。
此外，NEF还与AMF、SMF均有直接接口，分别对应N29接口和N51接口(为简化图示，上图中并未展示)，用于开放运营商网络能力至第三方应用功能实体，前者可用于NEF直接向AMF订阅相应网络事件、更新用户配置信息，后者可用于更新SMF/UPF上的应用配置数据，如Application ID所对应的分组流描述信息(packet flow description，PFD)。
应理解，上述应用于本申请实施例的网络架构仅是举例说明的从传统点到点的架构和服务化架构的角度描述的网络架构，适用本申请实施例的网络架构并不局限于此，任何能够实现上述各个网元的功能的网络架构都适用于本申请实施例。
应理解，图2中的各个网元之间的接口名称只是一个示例，具体实现中接口的名称可能为其他的名称，本申请对此不作具体限定。此外，上述各个网元之间的所传输的消息(或信令)的名称也仅仅是一个示例，对消息本身的功能不构成任何限定。
需要说明的是，上述网元也可以称为实体、设备、装置或模块等，本申请并未特别限定。并且，在本申请中，为了便于理解和说明，在对部分描述中省略网元这一描述，例如，将SMF网元简称SMF，此情况下，该“SMF”应理解为SMF网元，以下，省略对相同或相似情况的说明。
可以理解的是，上述网元或者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的软件功能，或者是平台(例如，云平台)上实例化的虚拟化功能。可选的，上述网元或者功能可以由一个设备实现，也可以由多个设备共同实现，还可以是一个设备内的一个功能模块，本申请实施例对此不作具体限定。
还应理解，在图2所示的通信系统中，各组成网元的功能仅为示例性的，各个组成网元在应用于本申请的实施例中时，并非全部功能都是必需的。
此外，如图2中包括的各个网元(比如PCF、AMF等)的命名仅是一个名字，名字对网元本身的功能不构成限定。在5G网络以及未来其它的网络中，上述各个网元也可以是其他的名字，本申请实施例对此不作具体限定。例如，在6G网络中，上述各个网元中的部分或全部可以沿用5G中的术语，也可能是其他命名，等等，在此进行统一说明，以下不再赘述。
还需说明的是，图2中控制面功能的各个网元之间的通信是以非服务化接口为例进行描述，但是并不对本申请实施例的保护范围构成限定的。本领域技术人员可以理解，图2中控制面功能的各个网元也可以通过服务化接口进行通信，比如，AMF对外提供的服务化接口可以为Namf；SMF提供的服务化接口可以为Nsmf；UDM对外提供的服务化接口可以为Nudm，AF提供的服务化接口可以为Naf；PCF对外提供的服务化接口可以为Npcf等等。
上述图2中的网元是基于参考点的架构，并不对本申请实施例构成限定。图3给出了基于服务化接口的架构示意图。如图3所示，该按架构包括：NSSF、AUSF、UDM、NEF、NRF、PCF、AF、AMF、SMF、UE、RAN、UPF、DN。在图3中，NSSF对外提供的服务化接口可以为Nnssf，NEF对外提供的服务化接口可以为Nnef，NRF对外提供的服务化接口可以为Nnrf，AMF对外提供的服务化接口可以为Namf；SMF提供的服务化接口可以为Nsmf；UDM对外提供的服务化接口可以为Nudm，AF提供的服务化接口可以为Naf；PCF对外提供的服务化接口可以为Npcf，AUSF对外提供的服务化接口可以为Nausf，CHF对外提供的服务化接口可以为Nchf；控制面功能与RAN和UPF间的接口是非服务化接口。UE通过N1接口与AMF连接，UE通过无线资源控制(radio resource control，RRC)协议与RAN连接；RAN通过N2接口与AMF连接，RAN通过N3接口与UPF连接；UPF通过N6接口与DN连接，同时，UPF通过N4接口与SMF连接。相关描述可以参考标准中的5G系统架构(5G system architecture)，为了简洁，这里对架构300的连接关系不作 赘述。
在本申请实施例中，通用的会话建立流程可简单描述为：UE通过RAN发送会话建立请求到AMF，AMF为该会话选择SMF为其提供服务，保存SMF与PDU会话的对应关系，并将会话建立请求发送至SMF，SMF为UE选择相应UPF并建立用户面传输路径，并为其分配IP地址。在此过程中，SMF还将向PCF发起策略控制会话建立请求，用于在SMF和PCF间建立策略控制会话，在策略控制会话建立过程中，SMF将保存策略控制会话与PDU会话间的对应关系。此外，AF还可与PCF间建立AF会话，由PCF对AF会话与策略控制会话进行绑定。
以上述PCF与SMF之间建立会话为例，当PCF上线时，可以向NRF发送注册请求(例如，NFRegister消息)，该请求消息中会携带自身的网元信息，即NFProfile，该网元信息中还可包含恢复时间recoveryTime，用以指示业务恢复时间戳。SMF在首次与该PCF进行交互时，还可向NRF订阅PCF的服务状态变更，以便NRF在判断PCF的网元信息发生变更时将该信息通知至SMF。
当PCF网元出现设备故障、退网、负载均衡(部分签约数据迁移至新的设备)等情况时，PCF与SMF之间建立的会话可能会受到影响，更严重时，PCF会丢失当前会话的信息。
目前一种技术为，PCF在发生重启后，例如故障重启、计划重启以及数据割接重启等，可以通过注册消息(例如，NFRegister消息)或更新消息(例如，NFUpdate消息)向NRF发送更新后的网元信息，即NFprofile，该网元信息包括更新后的recoveryTime，用以指示更新后的业务恢复时间戳。NRF判断PCF的网元信息中的recoveryTime发生变化，则向订阅了该PCF服务状态的SMF网元发送更新后的网元信息。收到订阅通知后，SMF基于所收到的recoveryTime判断在该时间点前的会话需采取恢复机制，则触发相应机制，如去激活用户会话，触发用户重建会话。
但是，上述方法中，PCF仅能通过携带更新后的recoveryTime指示SMF其当前发生了故障重启、搬迁或升级，而现网实际故障、搬迁场景丢失的会话通常以DNN粒度或切片粒度，仅目标DNN或切片用户会话受到影响，如PCF迁移Internet DNN会话场景，老的PCF上IP多媒体系统(IP multimedia subsystem，IMS)DNN会话并不受影响，因此SMF无需触发IMS DNN会话的会话重建流程。而现有方式将导致每次通知均会触发PCF下全量用户会话的重建流程，对核心网产生极大的信令浪费。
上述以PCF与SMF之间的会话为例进行了说明，但该问题同时存在于PCF与AMF之间的会话、CHF触发PCF更新以及UDM触发AMF/SMF更新等场景。
基于此，本申请提出了一种会话重建的方法，以期望能够精准感知故障网元会话状态，快速、准确地进行会话重建。
图4示出了本申请会话重建方法的一例示意性流程图。以下结合各步骤，将该会话重建方法400应用于上述图2或图3所示的网络架构中。
S410，第一网元接收来自网络存储功能网元的第二网元的网元信息，网元信息包括会话特征信息，会话特征信息用于指示第一网元与第二网元之间受影响的会话。
其中，会话特征信息包括以下至少一种：数据网络名称DNN、网络切片选择辅助信息NSSAI和公用陆地移动网络标识PLMN ID。
可选地，上述网元信息还包括第一恢复时间，第一网元根据会话特征信息与第二网元进行会话重建，包括：第一网元根据会话特征信息和第一恢复时间与第二网元进行会话重建。
可选地，上述方法还包括：第一网元根据第一恢复时间和第二恢复时间，确定第二网元发生故障，第二恢复时间为本地保存的，第二网元发生故障包括第二网元自身发生故障和/或第二网元与应用功能网元之间的链路发生故障。
可选地，上述方法还包括：第一网元向网络存储功能网元订阅第二网元的网元信息。
可选地，第二网元为策略控制网元，第一网元为接入与移动性管理网元、会话管理网元或网络开放网元；或者，第二网元为统一数据管理网元，第一网元为接入与移动性管理网元、会话管理网元、短消息业务网元或认证服务器网元；或者，第二网元为统一数据存储网元，第一网元为统一数据管理网元、策略控制网元或网络开放网元。
S420，第一网元根据会话特征信息与第二网元进行会话重建。
根据本申请的技术方案，网络存储功能网元可以向第一网元发送第二网元的网元信息，该网元信息包括会话特征信息，第一网元可以根据会话特征信息确定第一网元与第二网元之间受影响的会话，从而快速、准确地进行会话重建。
图5是本申请会话重建方法的具体示例的一例示意性流程图。
在该实施例中，针对第二网元(又称为服务端)出现服务端故障、数据丢失、异常等场景，第一网元(又称为客户端)可以精确感知第二网元(又称为服务端)丢失或异常的会话，针对性的进行会话重建。
S510，第二网元向网络仓库功能网元NRF发送注册网元信息。
具体地，第二网元可以向NRF发送注册请求(例如，NFRegister消息)，该请求消息中会携带自身的网元信息，即NFProfile，该网元信息中还可包含第二恢复时间recoveryTime2，用以指示业务恢复时间戳。
S520，第一网元向网络仓库功能网元NRF订阅第二网元的网元信息。
具体地，第一网元可以在首次与第二网元进行交互时，向网络仓库功能网元NRF订阅第二网元的服务状态变更，以便网络仓库功能网元NRF在判断第二网元的网元信息发生变更时将该信息通知至第一网元。
S530，第一网元与第二网元建立会话。
该过程可参照上述介绍的通用会话建立流程，为了简洁，在此不再赘述。
S540，第二网元确定自身网元故障。
具体地，第二网元确定自身网元故障可以包括第二网元出现设备故障、退网等，可选地，随着技术的发展，还可以包括其他可能的自身网元故障，本申请不对其进行限定。
S550，第二网元向网络仓库功能网元NRF发送第二网元的网元信息。
具体地，第二网元在故障恢复后，可以通过注册消息(例如，NFRegister消息)或更新消息(例如，NFUpdate消息)向NRF发送更新后的网元信息，即NFprofile，该更新后的网元信息包括会话特征信息，会话特征信息用于指示第一网元与第二网元之间受影响的会话。其中，会话特征信息包括以下至少一种：数据网络名称DNN、网络切片选择辅助信息NSSAI和公用陆地移动网络标识PLMN ID。
此外，该更新后的网元信息还可以包括更新后的恢复时间，可称为第一恢复时间 recoveryTime1，用以指示更新后的业务恢复时间戳。
S560，网络仓库功能网元NRF向第一网元发送第二网元的网元信息。
具体地，网络仓库功能网元NRF可以根据更新后的网元信息所包括的更新后的恢复时间，即第一恢复时间recoveryTime1，确定第一恢复时间不同于本地保存的第二恢复时间，从而确定第二网元的网元信息发生变更。进一步地，向订阅了该第二网元服务状态的第一网元发送第二网元更新后的网元信息，该更新后的网元信息包括上述会话特征信息。
S560，第一网元根据会话特征信息与第二网元进行会话重建。
具体地，第一网元可以根据会话特征信息中的数据网络名称DNN、网络切片选择辅助信息NSSAI和公用陆地移动网络标识PLMN ID，快速、准确的确定受影响的会话，从而进行会话重建，其具体重建过程可以参照当前协议中的规定，本申请不再对其进行介绍。
需要说明的是，上述第一网元和第二网元分别可代表多个网元，本申请不对其进行限定。例如，在5G系统中，第二网元可以为策略控制网元PCF，第一网元为接入与移动性管理网元AMF、会话管理网元SMF或网络开放网元NEF；或者，第二网元可以是统一数据管理网元UDM，第一网元为接入与移动性管理网元AMF、会话管理网元SMF、短消息业务网元SMSF或认证服务器网元AUSF；又或者，第二网元可以是统一数据存储网元UDR，第一网元为统一数据管理网元UDM、策略控制网元PCF或网络开放网元NEF。
其中，当第二网元为策略控制网元PCF时，会话重建指的是接入管理/会话管理策略关联AM/SM Policy Association重建；当第二网元为统一数据管理网元UDM时，会话重建可以是上下文重建。
根据本申请的技术方案，网络存储功能网元可以向第一网元发送第二网元的网元信息，该网元信息包括会话特征信息，第一网元可以根据会话特征信息确定第一网元与第二网元之间受影响的会话，从而快速、准确地进行会话重建。
图6是本申请会话重建方法的具体示例的另一例示意性流程图。
在该实施例中，以语音呼叫场景为例，第二网元与应用功能网元AF之间链路故障，长时间影响语音呼叫，第一网元(又称为客户端)可以精确感知第二网元(又称为服务端)丢失或异常的会话，针对性的进行会话重建，确保后续语音呼叫正常。该方案同样可适用于非语音呼叫的场景，本申请不对其进行限定，其具体流程与下述方法类似，在此不作赘述。
S610、S620、S630与S510、S520、S530相同，在此不再赘述。
S640，用户发起语音呼叫，第二网元上接收(receiving，Rx)/N5消息触发绑定成功，同时前端建立专有承载。
S650，语音呼叫失败，即语音呼叫的Rx消息或N5消息无法送达第二网元，导致语音受损。其中，Rx消息对应的是IMS AF与PCF之间采用直径Diameter协议的场景，N5消息对应的是IMS AF与PCF之间采用超文本传输(hypertext transfer protocol，HTTP)协议的场景。
S660，第二网元确定与应用功能AF之间的链路故障。
S670，第二网元向网络仓库功能网元NRF发送第二网元的网元信息。
具体地，第二网元在故障恢复后，可以通过注册消息(例如，NFRegister消息)或更新消息(例如，NFUpdate消息)向NRF发送更新后的网元信息，即NFprofile，该更新后 的网元信息包括会话特征信息，会话特征信息用于指示第一网元与第二网元之间受影响的会话。其中，会话特征信息包括以下至少一种：数据网络名称DNN、网络切片选择辅助信息NSSAI和公用陆地移动网络标识PLMN ID。
同时，该网元信息还可以用于指示删除语音会话所对应的IMS DNN，使得第一网元将新上线的IMS会话指向一个更新后的第二网元，避免新的IMS会话建立在该未更新的第二网元上，导致后续呼叫失败。
此外，该更新后的网元信息还可以包括更新后的恢复时间，可称为第一恢复时间recoveryTime1，用以指示更新后的业务恢复时间戳。
S680，网络仓库功能网元NRF向第一网元发送第二网元的网元信息。
具体地，网络仓库功能网元NRF可以根据更新后的网元信息所包括的更新后的恢复时间，即第一恢复时间recoveryTime1，确定第一恢复时间不同于本地保存的第二恢复时间，从而确定第二网元的网元信息发生变更。进一步地，向订阅了该第二网元服务状态的第一网元发送第二网元更新后的网元信息，该更新后的网元信息包括上述会话特征信息。
S690，第一网元根据会话特征信息与第二网元进行会话重建。
具体地，第一网元可以根据会话特征信息中的数据网络名称DNN、网络切片选择辅助信息NSSAI和公用陆地移动网络标识PLMN ID，快速、准确的确定受影响的会话，从而进行会话重建。例如，在该实施例中，第一网元可以根据IMS DNN确定受影响的会话，执行会话重建，而不影响网络Internet数据会话。其具体重建过程可以参照当前协议中的规定，本申请不再对其进行介绍。
其中，当上述网元信息用于指示删除IMS DNN，使得第一网元将新上线的IMS会话指向一个更新后的第二网元时，第一网元根据会话特征信息与更新后的第二网元进行会话重建，避免新的IMS会话建立在该未更新的第二网元上，导致后续呼叫失败。
需要说明的是，上述第一网元和第二网元分别可代表多个网元，其具体情形可参照图5中的描述，为了简洁，在此不再赘述。
根据本申请的技术方案，网络存储功能网元可以向第一网元发送第二网元的网元信息，该网元信息包括会话特征信息，第一网元可以根据会话特征信息确定第一网元与第二网元之间受影响的会话，从而快速、准确地进行会话重建。
应理解，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
还应理解，在本申请的各个实施例中，如果没有特殊说明以及逻辑冲突，不同的实施例之间的术语和/或描述具有一致性、且可以相互引用，不同的实施例中的技术特征根据其内在的逻辑关系可以组合形成新的实施例。
可以理解的是，本申请上述实施例中，由通信设备实现的方法，也可以由可配置于通信设备内部的部件(例如芯片或者电路)实现。
以上，结合图4至图6详细说明了本申请实施例提供的会话重建的方法。上述会话重建方法主要从各个网元之间交互的角度进行了介绍。可以理解的是，各个网元，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可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。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申请的范围。
以下，结合图7和图8详细说明本申请实施例提供的会话重建装置。应理解，装置实施例的描述与方法实施例的描述相互对应，因此，未详细描述的内容可以参见上文方法实施例，为了简洁，部分内容不再赘述。
本申请实施例可以根据上述方法示例对发射端设备或者接收端设备进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。下面以采用对应各个功能划分各个功能模块为例进行说明。
图7示出了本申请会话重建设备的一例示意性结构图。上述方法400至方法600中任一方法所涉及的任一网元，如第一网元、第二网元等都可以由图7所示的会话重建设备来实现。
应理解，会话重建设备700可以是实体设备，也可以是实体设备的部件(例如，集成电路，芯片等等)，还可以是实体设备中的功能模块。
如图7所示，该会话重建设备700包括：一个或多个处理器710。处理器710可以存储用于执行本申请实施例的方法的执行指令。可选地，处理器710中可以调用接口实现接收和发送功能。所述接口可以是逻辑接口或物理接口，对此不作限定。例如，接口可以是收发电路，或是接口电路。用于实现接收和发送功能的收发电路、或接口电路可以是分开的，也可以集成在一起。上述收发电路或接口电路可以用于代码/数据的读写，或者，上述收发电路或接口电路可以用于信号的传输或传递。
可选地，接口可以通过收发器实现。可选地，该会话重建设备700还可以包括收发器730。所述收发器730可以称为收发单元、收发机、收发电路或者收发器等，用于实现收发功能。
可选地，该会话重建设备700还可以包括存储器720。本申请实施例对存储器720的具体部署位置不作具体限定，该存储器可以集成于处理器中，也可以是独立于处理器之外。对于该会话重建装置700不包括存储器的情形，该会话重建设备700具备处理功能即可，存储器可以部署在其他位置(如，云系统)。
处理器710、存储器720和收发器730之间通过内部连接通路互相通信，传递控制和/或数据信号。
可以理解的是，尽管并未示出，会话重建设备700还可以包括其他装置，例如输入装置、输出装置、电池等。
可选的，在一些实施例中，存储器720可以存储用于执行本申请实施例的方法的执行指令。处理器710可以执行存储器720中存储的指令结合其他硬件(例如收发器730)完成下文所示方法执行的步骤，具体工作过程和有益效果可以参见上文方法实施例中的描述。
本申请实施例揭示的方法可以应用于处理器710中，或者由处理器710实现。处理器 710可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存取存储器(random access memory，RAM)、闪存、只读存储器(read-only memory，ROM)、可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的指令，结合其硬件完成上述方法的步骤。
可以理解，存储器720可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器ROM、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器RAM，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
图8示出了本申请会话重建装置的一例示意性结构图。
可选地，所述会话重建装置800的具体形态可以是通用计算机设备或通用计算机设备中的芯片，本申请实施例对此不作限定。如图8所示，该会话重建装置包括处理单元810和收发单元820。
具体而言，会话重建装置800可以是本申请涉及的任一网元，并且可以实现该网元所能实现的功能。应理解，会话重建装置800可以是实体设备，也可以是实体设备的部件(例如，集成电路，芯片等等)，还可以是实体设备中的功能模块。
在一种可能的设计中，该会话重建装置800可以是上文方法实施例中的第一网元装置，也可以是用于实现上文方法实施例中第一网元装置的功能的芯片。
例如，收发单元820，用于接收来自网络存储功能网元的第二网元的网元信息，所述网元信息包括会话特征信息，所述会话特征信息用于指示第一网元与所述第二网元之间受影响的会话；处理单元810，用于根据所述会话特征信息与所述第二网元进行会话重建。
其中，收发单元810，具体用于根据所述会话特征信息和所述第一恢复时间与所述第二网元进行会话重建。
可选地，处理单元810还用于根据所述第一恢复时间和第二恢复时间，确定所述第二 网元发生故障，所述第二恢复时间为本地保存的，所述第二网元发生故障包括所述第二网元自身发生故障和/或所述第二网元与应用功能网元之间的链路发生故障。
可选地，收发单元820还用于向所述网络存储功能网元订阅所述第二网元的所述网元信息。
还应理解，该会话重建装置800为第一网元设备时，该会话重建装置800中的收发单元820可通过通信接口(如收发器或输入/输出接口)实现，该会话重建装置800中的处理单元810可通过至少一个处理器实现，例如可对应于图7中示出的处理器710。
可选地，会话重建装置800还可以包括存储单元，该存储单元可以用于存储指令或者数据，处理单元可以调用该存储单元中存储的指令或者数据，以实现相应的操作。
应理解，各单元执行上述相应步骤的具体过程在上述方法实施例中已经详细说明，为了简洁，在此不再赘述。
在另一种可能的设计中，该会话重建装置800可以是上文方法实施例中的第二网元装置，也可以是用于实现上文方法实施例中第二网元功能的芯片。
例如，收发单元820，用于向网络存储功能网元发送第二网元的网元信息，所述网元信息包括会话特征信息，所述会话特征信息用于指示所述第二网元与第一网元之间受影响的会话；处理单元810，用于根据所述会话特征信息与所述第一网元进行会话重建。
其中，处理单元810，具体用于根据所述会话特征信息和所述第一恢复时间与所述第一网元进行会话重建。
可选地，处理单元810，还用于确定所述第二网元自身发生故障和/或所述第二网元与应用功能网元之间的链路发生故障。
可选地，收发单元820，还用于向所述网络存储功能网元注册所述第二网元的所述网元信息，所述网元信息包括第二恢复时间，所述第二恢复时间为本地保存的。
还应理解，该会话重建装置800为第二网元装置时，该会话重建装置800中的收发单元820可通过通信接口(如收发器或输入/输出接口)实现，例如可对应于图7中示出的通信接口730，该会话重建装置800中的处理单元810可通过至少一个处理器实现，例如可对应于图7中示出的处理器710。
可选地，会话重建装置800还可以包括存储单元，该存储单元可以用于存储指令或者数据，处理单元可以调用该存储单元中存储的指令或者数据，以实现相应的操作。
应理解，各单元执行上述相应步骤的具体过程在上述方法实施例中已经详细说明，为了简洁，在此不再赘述。
还应理解，装置800还可以用于实现上述方法实施例中的SMF、AMF等网元的功能，其中收发单元820可以用于实现与接收和发送相关的操作，处理单元810可以用于实现除接收和发送以外的其他操作，具体可以参见上述方法实施例中的描述，这里不再一一列出。
另外，在本申请中，会话重建装置800是以功能模块的形式来呈现。这里的“模块”可以指特定应用集成电路ASIC、电路、执行一个或多个软件或固件程序的处理器和存储器、集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到装置800可以采用图8所示的形式。处理单元810可以通过图7所示的处理器710来实现。可选地，如果图7所示的计算机设备包括存储器720，处理单元810可以通过处理器710和存储器720来实现。收发单元820可以通过图7所示的收发器 730来实现。所述收发器730包括接收功能和发送功能。具体的，处理器通过执行存储器中存储的计算机程序来实现。可选地，当所述装置800是芯片时，那么收发单元820的功能和/或实现过程还可以通过管脚或电路等来实现。可选地，所述存储器可以为所述芯片内的存储单元，比如寄存器、缓存等，所述存储单元还可以是所述计算机设备内的位于所述芯片外部的存储单元，如图7所的存储器720，或者，也可以是部署在其他系统或设备中的存储单元，不在所述计算机设备内。本领域普通技术人员可以意识到，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，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，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申请的范围。
本申请的各个方面或特征可以实现成方法、装置或使用标准编程和/或工程技术的制品。本申请中使用的术语“制品”涵盖可从任何计算机可读器件、载体或介质访问的计算机程序。例如，计算机可读介质可以包括，但不限于：磁存储器件(例如，硬盘、软盘或磁带等)，光盘(例如，压缩盘(compact disc，CD)、数字通用盘(digital versatile disc，DVD)等)，智能卡和闪存器件(例如，可擦写可编程只读存储器(erasable programmable read-only memory，EPROM)、卡、棒或钥匙驱动器等)。另外，本文描述的各种存储介质可代表用于存储信息的一个或多个设备和/或其它机器可读介质。术语“机器可读介质”可包括但不限于，无线信道和能够存储、包含和/或承载指令和/或数据的各种其它介质。
根据本申请实施例提供的方法，本申请还提供一种计算机程序产品，该计算机程序产品包括：计算机程序代码，当该计算机程序代码在计算机上运行时，使得该计算机执行图4至图6所示实施例中任意一个实施例的方法。
根据本申请实施例提供的方法，本申请还提供一种计算机可读介质，该计算机可读介质存储有程序代码，当该程序代码在计算机上运行时，使得该计算机执行图4至图6所示实施例中任意一个实施例的方法。
根据本申请实施例提供的方法，本申请还提供一种系统，其包括前述的装置或设备。
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指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disc，SSD))等。
在本说明书中使用的术语“部件”、“模块”、“系统”等用于表示计算机相关的实 体、硬件、固件、硬件和软件的组合、软件、或执行中的软件。例如，部件可以是但不限于，在处理器上运行的进程、处理器、对象、可执行文件、执行线程、程序和/或计算机。通过图示，在计算设备上运行的应用和计算设备都可以是部件。一个或多个部件可驻留在进程和/或执行线程中，部件可位于一个计算机上和/或分布在两个或更多个计算机之间。此外，这些部件可从在上面存储有各种数据结构的各种计算机可读介质执行。部件可例如根据具有一个或多个数据分组(例如来自与本地系统、分布式系统和/或网络间的另一部件交互的二个部件的数据，例如通过信号与其它系统交互的互联网)的信号通过本地和/或远程进程来通信。
还应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
还应理解，本申请实施例中引入编号“第一”、“第二”等只是为了区分不同的对象，比如，区分不同的“信息”，或，“设备”，或，“单元”，对具体对象以及不同对象间的对应关系的理解应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
本领域普通技术人员可以意识到，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，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，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申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机 存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (29)

  1. 一种会话重建的方法，其特征在于，包括：
    第一网元接收来自网络存储功能网元的第二网元的网元信息，所述网元信息包括会话特征信息，所述会话特征信息用于指示所述第一网元与所述第二网元之间受影响的会话；
    所述第一网元根据所述会话特征信息与所述第二网元进行会话重建。
  2. 根据权利要求1所述的方法，其特征在于，所述会话特征信息包括以下至少一种：
    数据网络名称DNN、网络切片选择辅助信息NSSAI和公用陆地移动网络标识PLMN ID。
  3. 根据权利要求1或2所述的方法，其特征在于，所述网元信息还包括第一恢复时间，
    所述第一网元根据所述会话特征信息与所述第二网元进行会话重建，包括：
    所述第一网元根据所述会话特征信息和所述第一恢复时间与所述第二网元进行会话重建。
  4. 根据权利要求3所述的方法，其特征在于，所述方法还包括：
    所述第一网元根据所述第一恢复时间和第二恢复时间，确定所述第二网元发生故障，所述第二恢复时间为本地保存的，所述第二网元发生故障包括所述第二网元自身发生故障和/或所述第二网元与应用功能网元之间的链路发生故障。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述方法还包括：
    所述第一网元向所述网络存储功能网元订阅所述第二网元的所述网元信息。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，
    所述第二网元为策略控制网元，所述第一网元为接入与移动性管理网元、会话管理网元或网络开放网元；或者，
    所述第二网元为统一数据管理网元，所述第一网元为接入与移动性管理网元、会话管理网元、短消息业务网元或认证服务器网元；或者，
    所述第二网元为统一数据存储网元，所述第一网元为统一数据管理网元、策略控制网元或网络开放网元。
  7. 一种会话重建的方法，其特征在于，包括：
    第二网元向网络存储功能网元发送网元信息，所述网元信息包括会话特征信息，所述会话特征信息用于指示所述第二网元与第一网元之间受影响的会话；
    所述第二网元根据所述会话特征信息与所述第一网元进行会话重建。
  8. 根据权利要求7所述的方法，其特征在于，所述会话特征信息包括以下至少一种：
    数据网络名称DNN、网络切片选择辅助信息NSSAI和公用陆地移动网络标识PLMN ID。
  9. 根据权利要求7或8所述的方法，其特征在于，所述网元信息还包括第一恢复时间，
    所述第二网元根据所述会话特征信息与所述第一网元进行会话重建，包括：
    所述第二网元根据所述会话特征信息和所述第一恢复时间与所述第一网元进行会话 重建。
  10. 根据权利要求9所述的方法，其特征在于，所述方法还包括：
    所述第二网元确定所述第二网元自身发生故障和/或所述第二网元与应用功能网元之间的链路发生故障。
  11. 根据权利要求7至10中任一项所述的方法，其特征在于，所述方法还包括：
    所述第二网元向所述网络存储功能网元注册所述第二网元的所述网元信息，所述网元信息包括第二恢复时间，所述第二恢复时间为本地保存的。
  12. 根据权利要求7至11中任一项所述的方法，其特征在于，
    所述第二网元为策略控制网元，所述第一网元为接入与移动性管理网元、会话管理网元或网络开放网元；或者，
    所述第二网元为统一数据管理网元，所述第一网元为接入与移动性管理网元、会话管理网元、短消息业务网元或认证服务器网元；或者，
    所述第二网元为统一数据存储网元，所述第一网元为统一数据管理网元、策略控制网元或网络开放网元。
  13. 一种会话重建的装置，其特征在于，包括：
    接收单元，用于接收来自网络存储功能网元的第二网元的网元信息，所述网元信息包括会话特征信息，所述会话特征信息用于指示第一网元与所述第二网元之间受影响的会话；
    处理单元，用于根据所述会话特征信息与所述第二网元进行会话重建。
  14. 根据权利要求13所述的装置，其特征在于，所述会话特征信息包括以下至少一种：
    数据网络名称DNN、网络切片选择辅助信息NSSAI和公用陆地移动网络标识PLMN ID。
  15. 根据权利要求13或14所述的装置，其特征在于，所述网元信息还包括第一恢复时间，
    所述处理单元，具体用于根据所述会话特征信息和所述第一恢复时间与所述第二网元进行会话重建。
  16. 根据权利要求15所述的装置，其特征在于，所述处理单元，还用于根据所述第一恢复时间和第二恢复时间，确定所述第二网元发生故障，所述第二恢复时间为本地保存的，所述第二网元发生故障包括所述第二网元自身发生故障和/或所述第二网元与应用功能网元之间的链路发生故障。
  17. 根据权利要求13至16中任一项所述的装置，其特征在于，所述收发单元，还用于向所述网络存储功能网元订阅所述第二网元的所述网元信息。
  18. 根据权利要求13至17中任一项所述的装置，其特征在于，
    所述第二网元为策略控制网元，所述第一网元为接入与移动性管理网元、会话管理网元或网络开放网元；或者，
    所述第二网元为统一数据管理网元，所述第一网元为接入与移动性管理网元、会话管理网元、短消息业务网元或认证服务器网元；或者，
    所述第二网元为统一数据存储网元，所述第一网元为统一数据管理网元、策略控制网 元或网络开放网元。
  19. 一种会话重建的装置，其特征在于，包括：
    收发单元，用于向网络存储功能网元发送第二网元的网元信息，所述网元信息包括会话特征信息，所述会话特征信息用于指示所述第二网元与第一网元之间受影响的会话；
    处理单元，用于根据所述会话特征信息与所述第一网元进行会话重建。
  20. 根据权利要求19所述的装置，其特征在于，所述会话特征信息包括以下至少一种：
    数据网络名称DNN、网络切片选择辅助信息NSSAI和公用陆地移动网络标识PLMN ID。
  21. 根据权利要求19或20所述的装置，其特征在于，所述网元信息还包括第一恢复时间，
    所述处理单元，具体用于根据所述会话特征信息和所述第一恢复时间与所述第一网元进行会话重建。
  22. 根据权利要求21所述的装置，其特征在于，所述处理单元，还用于确定所述第二网元自身发生故障和/或所述第二网元与应用功能网元之间的链路发生故障。
  23. 根据权利要求19至22中任一项所述的装置，其特征在于，所述收发单元，还用于向所述网络存储功能网元注册所述第二网元的所述网元信息，所述网元信息包括第二恢复时间，所述第二恢复时间为本地保存的。
  24. 根据权利要求19至23中任一项所述的装置，其特征在于，
    所述第二网元为策略控制网元，所述第一网元为接入与移动性管理网元、会话管理网元或网络开放网元；或者，
    所述第二网元为统一数据管理网元，所述第一网元为接入与移动性管理网元、会话管理网元、短消息业务网元或认证服务器网元；或者，
    所述第二网元为统一数据存储网元，所述第一网元为统一数据管理网元、策略控制网元或网络开放网元。
  25. 一种通信系统，所述通信系统包括第一网元、第二网元；
    所述第二网元用于发送网元信息，所述网元信息包括会话特征信息，所述会话特征信息用于指示所述第二网元与所述第一网元受影响的会话；
    所述第一网元用于接收所述网元信息，根据所述会话特征信息与所述第二网元进行会话重建。
  26. 根据权利要求25所述的系统，其特征在于，所述系统还包括网络存储功能网元，
    所述网络存储功能网元，用于接收来自所述第二网元的网元信息；向所述第一网元发送所述网元信息，所述网元信息包括会话特征信息，所述会话特征信息用于指示所述第二网元与所述第一网元受影响的会话。
  27. 一种通信方法，其特征在于，所述方法包括：
    第二网元用于发送网元信息，所述网元信息包括会话特征信息，所述会话特征信息用于指示所述第二网元与第一网元受影响的会话；
    所述第一网元接收所述网元信息，根据所述会话特征信息与所述第二网元进行会话重建。
  28. 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中存储有指令，当其在计算机上运行时，使得所述计算机执行如权利要求1-6中任一项所述的方法。
  29. 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中存储有指令，当其在计算机上运行时，使得所述计算机执行如权利要求7-12中任一项所述的方法。
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