WO2020200242A1 - 会话处理的方法、通信装置及通信系统 - Google Patents

会话处理的方法、通信装置及通信系统 Download PDF

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Publication number
WO2020200242A1
WO2020200242A1 PCT/CN2020/082767 CN2020082767W WO2020200242A1 WO 2020200242 A1 WO2020200242 A1 WO 2020200242A1 CN 2020082767 W CN2020082767 W CN 2020082767W WO 2020200242 A1 WO2020200242 A1 WO 2020200242A1
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Prior art keywords
session
ladn
smf
amf
service area
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PCT/CN2020/082767
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English (en)
French (fr)
Inventor
姚琦
宗在峰
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to JP2021558875A priority Critical patent/JP7250955B2/ja
Priority to EP20782129.9A priority patent/EP3934368B1/en
Publication of WO2020200242A1 publication Critical patent/WO2020200242A1/zh
Priority to US17/492,609 priority patent/US11677837B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/32—Release of transport tunnels

Definitions

  • This application relates to the field of communication, and in particular, to a method, communication device, and communication system for session processing.
  • LADN Local area data network
  • a user equipment equipment user, UE
  • PDU packet data unit
  • the UE accesses the local user plane function (UPF) through wireless access to achieve direct access to the local network, so that it can obtain its own commonly used data from LADN without going through a network other than LADN, reducing acquisition The delay of data and the bandwidth occupied by the UE frequently requesting data from networks other than LADN.
  • UPF local user plane function
  • LADN only covers a specific service area, and LADN information is configured on the access and mobility management network element (access and mobility management function, AMF).
  • AMF access and mobility management function
  • AMF only needs to configure the LADN information in its service area, such as the service area of LADN.
  • the UE may correspond to the new AMF, and in the current network architecture, according to the needs of the UE during the network handover process, two SMFs may also be involved, such as inserting an intermediate SMF
  • An intermediate UPF is provided for UEs that cannot access the UPF of the anchor SMF, so that the UE can access the anchor UPF.
  • the information of the LADN network is not configured on the intermediate SMF, it cannot identify the received instruction information related to the LADN session, and thus cannot send the LADN-related instruction information to the anchor SMF, which affects the normal operation of the anchor SMF. Session operation.
  • the present application provides a session processing method, communication device and communication system to solve the problem that the session cannot be processed normally when there are two session management network elements SMF.
  • a session processing method including: an intermediate session management network element SMF receives a request message sent by an access mobility management network element AMF, the request message includes a session identifier, and the intermediate SMF is a user The SMF selected by the AMF when the device UE moves out of the service area of the anchor SMF; when the session corresponding to the session identifier is a local area data network LADN session, the intermediate SMF rejects the session corresponding to the session identifier.
  • the intermediate SMF learns that the requested session is a LADN session
  • the UE can not continue to access the LADN service after moving out of the service area of the anchor SMF, thereby avoiding LADN service resources. waste.
  • the intermediate SMF determines that the session is a LADN session according to the session context sent by the anchor SMF, and the session context includes instructions for indicating that the session is the The first indication information of the LADN session; or, the intermediate SMF determines that the session is a LADN session according to the second indication information sent by the AMF, and the second indication information is used to indicate that the UE is outside the service area of the LADN.
  • the intermediate SMF sends a first message to the AMF, and the first message includes cause information.
  • the reason information includes: the LADN session refuses to insert the intermediate SMF and the intermediate user plane network element UPF.
  • the service range of the LADN corresponding to the LADN session is within the service area of the anchor SMF.
  • a method for session processing including: AMF sends a request message to an intermediate SMF, the request message includes a session identifier, wherein the intermediate SMF is the AMF when the UE moves out of the service area of the anchor SMF Selected SMF: The AMF receives the first message sent by the intermediate SMF, and the first message includes reason information.
  • the UE when the anchor SMF learns that the requested session is a LADN session, by rejecting the session, the UE can not continue to access the LADN service after moving out of the service area of the anchor SMF, thereby avoiding LADN service resources Waste.
  • the reason information includes: the LADN session refuses to insert the intermediate SMF and the intermediate user plane network element UPF.
  • the AMF sends cause information to the radio access network RAN.
  • the AMF sends a session release request message to the anchor SMF, and the session release request message is used to request the anchor SMF to release the LADN session.
  • the LADN to which the LADN session belongs is within the service area of the anchor SMF.
  • a session processing method including: an anchor SMF receives a request message sent by an intermediate SMF, the request message includes a session identifier, wherein the intermediate SMF is the one when the UE moves out of the service area of the anchor SMF The SMF selected by the AMF; when the session corresponding to the session identifier is a LADN session, the anchor SMF rejects the session corresponding to the session identifier, wherein the LADN session is a session served by the anchor SMF.
  • the request message is used to request insertion of an intermediate SMF.
  • the anchor SMF determines that the current session is a LADN session according to the session context; or, the anchor SMF determines that the current session is a LADN session according to configuration information, and
  • the configuration information includes that the DNN corresponding to the current session is LADN.
  • the anchor SMF sends a second message to the intermediate SMF, and the second message includes reason information, and the reason information is used to indicate the session Activation failed; or, the reason information is used to indicate that the intermediate SMF refuses to activate the session.
  • the anchor SMF rejects the session corresponding to the session identifier, including: the anchor SMF releases the session corresponding to the session identifier; or, the The anchor SMF deactivates the session corresponding to the session identifier; or the anchor SMF refuses to activate or switch the session corresponding to the session identifier.
  • the reason information includes: the LADN session refuses to insert an intermediate SMF and an intermediate UPF.
  • the service range of the LADN corresponding to the LADN session is within the service area of the anchor SMF.
  • a session processing method including: a first intermediate SMF receives first indication information, where the first indication information is used to indicate that the data network name DNN corresponding to the current session is LADN, and the first intermediate SMF SMF is used to control the intermediate UPF of the interface with the target base station; the first intermediate SMF sends second indication information to the anchor SMF, where the second indication information is used to indicate that the UE is outside the service area of LADN, and The anchor SMF is the anchor SMF of the current session; the anchor SMF releases the current session according to the second indication information.
  • the first intermediate SMF learns that the current session is a LADN session according to the first indication information, and can then identify the LADN information later, so that the LADN session can be further processed.
  • the first intermediate SMF receives a third message sent by the target AMF; when the third message does not include that the UE is within the service area of the LADN In case of external indication information, the first intermediate SMF determines that the UE is outside the service area of the LADN, and the target AMF is the AMF to which the UE is handed over.
  • the first intermediate SMF receives a fourth message sent by the target AMF; when the fourth message includes that the UE is outside the service area of the LANF At this time, the first intermediate SMF sends the second indication information to the anchor SMF.
  • the first indication information is sent by any of the following network elements: the source AMF, the target AMF, the anchor SMF, or a second intermediate SMF, and the second intermediate SMF is used to control the interface with the source base station The middle UPF.
  • a session processing method including: a target AMF receives first indication information sent by a source AMF, the first indication information is used to indicate that the DNN corresponding to the current session is LADN; when the target AMF determines When the UE moves out of the service area of the LADN, the target AMF sends second indication information to the first intermediate SMF.
  • the second indication information is used to indicate that the UE is outside the service area of the LADN.
  • the intermediate SMF is used to control the intermediate UPF that interfaces with the target base station.
  • the LADN information may not be configured on the new AMF, and it is impossible to determine whether the UE is located in the service area of the LADN.
  • the source AMF notifies the target AMF of the LADN information through the source AMF before the AMF handover, so that the target AMF obtains the LADN information, so that the information can be further notified to the SMF, ensuring the normal processing of the LADN session .
  • the target AMF determining that the UE moves out of the service area of the LADN includes: when the information of the LADN is not configured on the target AMF, The target AMF determines that the UE moves out of the service area of the LADN.
  • the target AMF determining that the UE moves out of the service area of the LADN includes: when the target AMF is configured with the LADN information, the The target AMF determines that the UE moves out of the service area of the LADN according to the information of the LADN and the location of the UE.
  • the information of the LADN includes service area information of the LAND.
  • a communication device including at least one processor and a communication interface, the communication interface is used for the network device to exchange information with other network devices, when program instructions are executed in the at least one processor At this time, the function of the method described in any one of the implementation manners in the first aspect on the anchor SMF can be realized by the network device.
  • a communication device including at least one processor and a communication interface, where the communication interface is used for information interaction between the network device and other network devices, when program instructions are executed in the at least one processor At this time, the function of the method on the anchor SMF as described in any implementation manner of the second aspect is realized by the network device.
  • a communication device including at least one processor and a communication interface, the communication interface is used for the network device to exchange information with other network devices, when program instructions are executed in the at least one processor At this time, the network device is enabled to realize the function on the first intermediate SMF of the method described in any one of the implementation manners of the third aspect.
  • a communication device including at least one processor and a communication interface.
  • the communication interface is used for information interaction between the network device and other network devices.
  • a communication system including an intermediate session management network element SMF and an access mobility management network element AMF for performing the method described in the first aspect.
  • a communication system which includes an anchor SMF, an intermediate SMF, and AMF for performing the method described in the second aspect.
  • a communication system which includes a first intermediate SMF and an anchor SMF for performing the method described in the third aspect.
  • a communication system including a source SMF and a target SMF for executing the method described in the fourth aspect.
  • a computer program product includes: computer program code, when the computer program code is executed by a communication device (for example, a terminal device or a network device), the communication device is executed The method in the first aspect to the fifth aspect or any one of its implementation manners.
  • a communication device for example, a terminal device or a network device
  • a computer-readable storage medium stores program instructions that enable a communication device (for example, a terminal device or a network device) to execute the first aspect to the first aspect.
  • the method in the five aspects or any of its implementation modes.
  • Figure 1 is a schematic diagram of the local network system architecture.
  • Figure 2 is a schematic diagram of the network architecture of the 5G system.
  • FIG. 3 is a schematic flowchart of a session processing method provided by an embodiment of the application.
  • FIG. 4 is a schematic flowchart of another session processing method provided by an embodiment of the application.
  • FIG. 5 is a schematic flowchart of yet another session processing method provided by an embodiment of this application.
  • FIG. 6 is a schematic flowchart of another session processing method provided by an embodiment of the application.
  • FIG. 7 is a schematic flowchart of yet another session processing method provided by an embodiment of this application.
  • FIG. 8 is a schematic flowchart of yet another session processing method provided by an embodiment of this application.
  • FIG. 9 is a schematic flowchart of yet another session processing method provided by an embodiment of this application.
  • FIG. 10 is a schematic flowchart of yet another session processing method provided by an embodiment of this application.
  • FIG. 11 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 12 is a schematic structural diagram of a communication device provided by another embodiment of this application.
  • FIG. 13 is a schematic structural diagram of a communication device provided by another embodiment of this application.
  • FIG. 14 is a schematic structural diagram of a communication device provided by another embodiment of this application.
  • FIG. 15 is a schematic structural diagram of a communication device provided by another embodiment of this application.
  • FIG. 16 is a schematic structural diagram of a communication device provided by another embodiment of this application.
  • GSM global system for mobile communications
  • CDMA code division multiple access
  • WCDMA broadband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • LTE frequency division duplex FDD
  • TDD LTE Time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • 5G future fifth generation
  • 5G fifth generation
  • NR new radio
  • the above-mentioned various systems may include session management network elements and access and mobility management network elements.
  • network elements with session management functions and network elements with access and mobility management functions may correspond to different names, such as In the 5G system, the session management network element can be called SMF, and the access and mobility management network element can be called AMF.
  • the terminal device in the embodiments of the present application may be user equipment (UE), terminal equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal , Terminal, wireless communication equipment, user agent or user device.
  • the terminal device can also be a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (personal digital assistant, PDA), with wireless communication Functional handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the future 5G network or future evolution of the public land mobile network (PLMN)
  • a terminal device, etc., a terminal device or a user equipment is also a kind of chip, which is not limited in the embodiment of the present application.
  • the technical solutions provided in the embodiments of the present application may be applicable to a session processing scenario for LADN.
  • the user equipment When the user equipment enters the service area of the LADN, it will establish a session to access the service of the LADN, the session may be a LADN session, and the LADN session is used for a session in which the UE performs data transmission in the LADN service area.
  • the anchor SMF anchor-SMF, A-SMF
  • the anchor SMF in the current network system cannot perceive the location information of the UE by itself, and needs to subscribe to the location information of the UE from the access and mobility management function (AMF).
  • AMF access and mobility management function
  • AMF can detect whether the UE is in the service area of LADN, and send to the anchor SMF indicating whether the UE is in the service area of the LADN, for example, when the AMF detects that the UE moves out of the service area of the current LADN, the AMF can send a message to the anchor point SMF sends indication information indicating that the UE is outside the service area of LADN or removed from the service area of LADN.
  • the indication information may be indicated as "OUT" in the notification message of the UE presence in LADN, so that the anchor SMF can learn about the UE. Move out of the current service area of LADN, and then release or deactivate the session, so that the UE cannot continue to access the service provided by LADN.
  • AMF switching may occur, that is, it needs to be switched from the source AMF to the target AMF, where the source AMF is the AMF of the UE before the move, and the target AMF is the UE The new AMF to switch to after the move.
  • the source AMF is configured with LADN information, but the target AMF may not be configured with LADN related information.
  • the related information may be, for example, the network name corresponding to the LADN, the service area information of the LADN, and the like. Therefore, the target AMF will not send to the anchor SMF the indication information of whether the UE has moved out of the service area of the LADN.
  • the UE may not be able to directly access the anchor point UPF (anchor-UPF, A-UPF) controlled by the anchor point SMF through the RAN.
  • an intermediate SMF intermediate-SMF, I -SMF
  • the intermediate SMF can choose to insert an intermediate UPF (intermediate-UPF, I-UPF) to connect the RAN and the anchor UPF.
  • the anchor SMF can configure which DNN corresponds to LADN information, and can handle related operations of LAND sessions, such as the establishment and release of LADN sessions.
  • the intermediate SMF in the current network system generally does not configure which DNN corresponds to the relevant information of the LADN. Therefore, when there is an intermediate SMF, there may be problems in processing the LADN session. For example, when the UE switches to a new AMF after moving, the new AMF is not configured with LADN related information, so the AMF will not Send an indication message to the intermediate SMF that the UE moves out of LADN. At this time, because the intermediate SMF has not configured which DNNs are LAND, it cannot know that the current session is a LADN session, and will not send a notification message to the anchor SMF that the UE moves out of LADN. The anchor SMF cannot perceive that the UE moves out of the LADN service area, and will not trigger deactivation or session release operations. This makes the UE still access the LADN after moving out of the LADN service area, which violates the access principle of LADN network services.
  • Figure 1 shows a schematic diagram of a local area network architecture involved in an embodiment of the present application.
  • LADN refers to a network covering a specific local area.
  • the UE accesses the local UPF through the RAN, thereby realizing direct access to the LADN.
  • the local UPF may be, for example, the UPF in the campus enterprise network or the UPF close to the LADN.
  • the UE's direct access to the LADN network can reduce the time delay of accessing applications and at the same time reduce the transmission bandwidth occupied by the backbone network.
  • the application of LADN can be, for example, the stadium provides live virtual reality (VR) live broadcast, the campus provides communication in the campus to enable UE to access the learning resources on the campus, the enterprise park provides industrial control communication, and the mall provides local shopping discount push and real-time Location navigation, etc.
  • VR live virtual reality
  • the LADN information may include the name of the LADN and the information of the corresponding service area, etc.
  • the ALDN information may be configured on the AMF. Among them, the AMF may only configure LADN information in its service area. For example, the AMF in Beijing will not configure the LADN information in Shenzhen.
  • AMF can detect whether the UE is in the service area of the LADN according to the service area of the LADN and the location of the UE. When the UE moves out of the current LADN service area, the AMF sends an indication to the A-SMF that the UE moves out of the LADN service area. A-SMF then releases or deactivates the LADN session established by the UE, that is, the UE is no longer allowed to access the LADN service.
  • Fig. 2 is a schematic diagram of a 5G system network architecture applied by an embodiment of the present application.
  • the UE can perform RAN handover based on the Xn interface, where the Xn interface is the interface between the source access network (source-RAN, S-RAN) and the target access network (target-RAN, T-RAN) .
  • the network elements in the 5G system involved in the session processing method provided by the embodiments of the present application include RAN, source-AMF (source-AMF, S-AMF), target AMF (target-AMF, A-AMF), I-SMF, A- SMF and UPF etc.
  • source-AMF source-AMF
  • S-AMF target AMF
  • I-SMF I-SMF
  • A- SMF A-SMF
  • UPF User Plane Radio Service
  • the access network may include the access network S-RAN in the source network and the access network T-RAN in the target network.
  • AMF Access and mobility management function network element, mainly through N1 access to the UE's non-access stratum (non-access stratum, NAS) signaling and N2 access to RAN signaling, where NAS signaling may include sessions, for example Management (session management, SM) signaling.
  • AMF can be used for UE registration process and SM signaling forwarding and mobility management.
  • the SMF in the embodiment of the present application includes I-SMF and A-SMF.
  • A-SMF is an SMF for a service session.
  • the A-SMF has a policy and charging control (PCC) interface and a unified data management (UDM) interface, which can be used to execute the UE Internet Protocol (Internet Protocol). protocol, IP) address allocation, etc.
  • PCC policy and charging control
  • UDM unified data management
  • the I-SMF can be used to control the intermediate user plane network element I-UPF that cannot receive the A-SMF control.
  • the I-UPF can be an intermediate UPF between the RAN and the session anchor A-UPF. I-SMF can be inserted, switched or removed as needed.
  • the RAN to which the UE is attached may not be able to directly connect to the A-UPF controlled by the A-SMF.
  • a new I-SMF can be inserted.
  • the I-SMF selects and inserts the I -UPF enables the UE to access I-UPF first through RAN, and then connect to A-UPF through I-UPF.
  • UPF User plane function network element, mainly used for data packet forwarding, quality of service (quality of service, QoS) flow mapping, etc.
  • the embodiments of this application may be applicable to the process in which the UE moves out of the service area of the LADN.
  • the following describes the session processing method involved in the embodiment of the present application in conjunction with FIG. 3.
  • Fig. 3 shows a schematic flowchart of a session processing method provided by an embodiment of the present application.
  • This embodiment is applicable to the process of UE movement. Specifically, the UE establishes a LADN session in the LADN service area, but subsequently the LADN session becomes deactivated, and then the UE moves out of the LADN service area. In the aforementioned situation, the UE initiates a service request outside the service area of the LADN, requesting to activate the LADN session.
  • the LADN session is restricted to not allow the insertion of intermediate SMF and intermediate UPF to continue to access the service of the LADN, so as to simplify the processing of the LADN session in the mobile process.
  • the service area of LADN is a subset of the service area of the anchor SMF, that is, the service area of LADN is included in the service area of the anchor SMF, and when the UE moves out of the service area of the anchor SMF At the same time, the UE must also move out of the service area of LADN at the same time.
  • the AMF may or may not be switched. The specific process of the embodiment in FIG. 1 is as follows.
  • S301 The UE initiates a service request to the RAN.
  • the UE initiates a service request process to the RAN.
  • the UE may send registration request information to the RAN.
  • the registration request information includes the session identifiers to be activated. Specifically, it may include a list of session identifiers to be activated.
  • the DNN corresponding to the session identifier may be LADN DNN or non-LADN DNN. There are multiple types of DNNs. This embodiment only introduces the DNN corresponding to the session identifier as LADN DNN.
  • the session identifier or the DNN corresponding to the session is LADN DNN
  • the session identifier or the DNN corresponding to the session is LADN
  • the corresponding session is LADN session
  • the session identifier or the session corresponds to DNN is LADN
  • the above expressions have the same meaning, and are used to indicate that the session is a LADN session, which is applicable to all positions in this application document. A unified explanation is given here and will not be repeated hereafter.
  • the RAN sends a service request message to the AMF.
  • the DNN corresponding to the session identifier included in the service request message sent by the RAN to the AMF is LADN.
  • the service request message is used to request activation of the current session; in an embodiment, the request information may be used to request a session management (SM) context.
  • SM session management
  • the AMF selects an intermediate SMF.
  • the AMF chooses to insert an intermediate SMF, and the intermediate SMF can select an intermediate UPF to connect with the anchor UPF.
  • the process of AMF selecting the intermediate SMF can refer to the existing process, which will not be repeated here.
  • the AMF may be the source AMF without switching, or the target AMF after the AMF switching procedure has occurred.
  • the AMF sends a request message to the intermediate SMF.
  • the AMF sends a request message to the intermediate SMF.
  • the request message is used to request the creation of a session context.
  • the request message includes a session identifier.
  • the session identifier may be a PDU session ID, or other identifiers that can uniquely determine the session in the intermediate SMF, such as URI (Uniform Resource Identifier), SM context ID, etc., which are not limited in this application.
  • the AMF when the AMF does not switch, the LADN information is configured on the AMF, and the AMF can determine whether the UE has moved out of the LADN service according to the configured LADN information (including LADN DNN and the corresponding service area, etc.) and the UE location information area.
  • the session creation request message sent by the AMF to the intermediate SMF may include indication information indicating that the UE is outside the service area of the LADN, that is, the second indication information.
  • the AMF when the AMF is switched, the AMF is the new AMF after the handover.
  • the LADN information may not be configured on the AMF.
  • the session creation request sent by the AMF to the intermediate SMF may not include the indication information that the UE is outside the service area of the LADN.
  • the intermediate SMF sends a request message to the anchor SMF.
  • the request message sent by the intermediate SMF to the anchor SMF is a session context request message, that is, the request message is used to request the anchor SMF for the session context corresponding to the session ID.
  • the session context request message sent by the intermediate SMF to the anchor SMF may include second indication information, and the second indication information is used to indicate that the UE is outside the service area of the LADN.
  • the session context request message may also include request indication information for activating the session.
  • the anchor SMF sends a reply message to the intermediate SMF, and the reply message may be a session context reply message.
  • the intermediate SMF receives the session context reply message of the anchor SMF.
  • the message contains the session context
  • the intermediate SMF determines that the session is a LADN session according to the session context
  • the intermediate SMF rejects the session corresponding to the session identifier.
  • the session context sent by the anchor SMF to the intermediate SMF includes first indication information, and the first indication information is used to indicate that the DNN corresponding to the current session is the LADN.
  • the intermediate SMF receives the session context reply message of the anchor SMF.
  • the session context reply message includes reason information, and the intermediate SMF rejects the session corresponding to the session identifier.
  • the anchor SMF determines that the current session is a LADN session, the anchor SMF refuses to send the session context to the intermediate SMF, and the session context reply message includes reason information.
  • the reason information may be that the LADN session refuses to insert the I-SMF.
  • the intermediate SMF rejects the session corresponding to the session identifier.
  • the session corresponding to the intermediate SMF rejected session identifier can be multiple, including: the intermediate SMF refuses to activate the session corresponding to the session identifier, or the intermediate SMF refuses to activate the user plane of the session corresponding to the session identifier, or the intermediate SMF decides to release the session identifier Corresponding session; it should be understood that in a handover scenario, the intermediate SMF refuses to switch the session corresponding to the session identifier, or the intermediate SMF refuses to activate the user plane of the session corresponding to the session identifier, or the intermediate SMF decides to release the session corresponding to the session identifier.
  • the user plane includes the transmission path between the RAN and the UPF, and/or the wireless connection between the UE and the RAN.
  • the session context reply message of the anchor SMF received by the intermediate SMF includes the session context, and the session context may include first indication information.
  • the first indication information is used to indicate that the DNN corresponding to the current session is LADN, and the intermediate SMF rejects The session corresponding to the session identifier.
  • the session context reply message of the anchor SMF received by the intermediate SMF includes reason information, and the intermediate SMF rejects the session corresponding to the session identifier.
  • the intermediate SMF determines that the session corresponding to the session ID is a LADN session, that is, the current session is a LADN session
  • the intermediate SMF rejects the session corresponding to the session ID.
  • the intermediate SMF determines that the current session is a LADN session: the session context sent by the anchor SMF to the intermediate SMF includes first indication information, which is used to indicate that the DNN corresponding to the current session is LADN; or, the intermediate SMF The session is determined to be a LADN session according to the configuration information.
  • the configuration information may be, for example, information stored on the intermediate SMF; or the intermediate SMF may also determine that the session is a LADN session according to the second indication information sent by the AMF, where the second indication information is used To indicate that the UE is outside the service area of LADN.
  • the intermediate SMF rejects the session corresponding to the session identifier, terminates the activation of the session or terminates the user plane that activates the session.
  • the user plane of the session is the data transmission path.
  • the intermediate SMF sends the first message to the AMF.
  • the first message may be a conversation context reply message.
  • the first message includes reason information for rejecting the corresponding session.
  • the intermediate SMF sends reason information to the AMF to notify the AMF to refuse to activate the current session, that is, the LADN session, or the intermediate SMF sends the reason information to the AMF to notify the AMF to refuse to activate the user plane of the current session.
  • the reason information is used to indicate the reason for the session activation failure.
  • the reason may be that the LADN session refuses to insert intermediate SMF and intermediate UPF.
  • the embodiment shown in FIG. 3 may also include a second implementation manner.
  • the anchor SMF determines that the current session is a LADN session, and rejects the session corresponding to the session identifier.
  • step S301 to step S303 includes step S309 to step S313, wherein the specific description of step S301 to step S303 is described above, and will not be repeated here.
  • the AMF sends a session context creation request message to the intermediate SMF.
  • the intermediate SMF sends a request message to the anchor SMF.
  • the intermediate SMF sends a session update request message or a session creation request message to the anchor SMF, and the session update request message or the session creation update message includes the session identifier.
  • the intermediate SMF sends a context request message to the anchor SMF, and the process is similar to step S305, and can refer to the description of S305. .
  • the anchor SMF receives the session update request message or the session creation request message sent by the intermediate SMF, and determines that the request message is used to request insertion of the intermediate SMF.
  • the anchor SMF receives a session creation or session update request sent by the new intermediate SMF, and determines that the request message is used to insert the intermediate SMF.
  • the anchor SMF rejects the session corresponding to the session identifier.
  • the anchor SMF After the anchor SMF receives the intermediate SMF request message, when the anchor SMF determines that the session corresponding to the session identifier is a LADN session, the anchor SMF rejects the session.
  • the denial of the session may specifically be: the anchor SMF refuses to activate the session corresponding to the session identifier, or the anchor SMF refuses to activate the user plane of the session corresponding to the session identifier, or the subsequent anchor SMF releases the session corresponding to the session identifier, or ,
  • the anchor SMF determines to de-activate the session corresponding to the session identifier.
  • the anchor SMF may determine that the current session is a LADN session according to the session context.
  • the session context includes first indication information, and the first indication information is used to indicate that the DNN corresponding to the current session is LADN.
  • the anchor SMF may determine the LADN session according to its own configuration information, for example, the configuration information may be the anchor SMF to store which DNNs are LADN, and so on.
  • the anchor SMF refuses to send the session context to the intermediate SMF, and includes reason information in the session context reply message.
  • the indication information may be that the LADN session refuses to insert the intermediate SMF and the user plane network element UPF.
  • the anchor SMF may determine the LADN session in multiple ways. Specifically, the anchor SMF may determine the LADN session according to its own configuration information; or the anchor SMF may determine that the current session is the LADN session according to the session context, for example, It is determined that the current session is a LADN session according to the first indication information used to indicate that the DNN corresponding to the current session is the LADN in the session context.
  • the configuration information may be the information of the LADN stored in the anchor SMF, for example, which DNNs are LADN, and so on.
  • the anchor SMF sends the second message to the intermediate SMF.
  • the second message may be a create session context reply message.
  • the second message contains indication information or reason information.
  • the indication information or reason information is used to indicate that the session activation fails, or is used to indicate that the intermediate SMF does not activate the user plane of the session, that is, the intermediate SMF determines to reject the session according to the indication information Activate the user plane of the session.
  • the user plane includes the transmission path between the RAN and the UPF, and/or the wireless connection between the UE and the RAN. It should be noted that in FIG. 4 of the embodiment, the indication information should be correspondingly understood as used to indicate the session switching failure.
  • the indication information may indicate corresponding information for different scenarios.
  • a service request scenario that is, a scenario where a session is requested to be activated
  • the indication information is used to indicate that the session activation fails or the intermediate SMF does not activate the session.
  • User plane when switching scenes, this indication information is used to indicate that the session switching fails.
  • the second message further includes information about the reason for rejecting the current LADN session.
  • the reason may be that the LADN session refuses to insert the intermediate SMF and the intermediate UPF, for example.
  • the second message sent by the anchor SMF to the intermediate SMF is used to instruct the anchor SMF to refuse to activate the session corresponding to the session identifier, that is, the LADN session.
  • the anchor SMF sends a rejection message to the intermediate SMF to notify the intermediate SMF that the current session activation fails or the activation is terminated.
  • the second message sent by the anchor SMF to the intermediate SMF carries information indicating the reason for refusing to activate the session or information indicating the reason for the activation failure of the session activation.
  • the reason information may be that the LADN session refuses to insert the intermediate SMF and the intermediate UPF, for example.
  • the intermediate SMF sends the indication information in the second message to the AMF.
  • the intermediate SMF sends the reason information in the second message to the AMF.
  • FIG. 4 shows a schematic flowchart of another method for processing a session provided by an embodiment of the present application.
  • This embodiment is applicable to the process of UE movement.
  • the UE establishes a LADN session in the service area of the LADN, and when the UE moves out of the service area of the anchor SMF, it initiates a handover procedure (applicable to Xn handover and N2 handover), requesting to switch the LADN session.
  • the AMF may or may not have been switched.
  • it is restricted that it is not allowed to continue to access the LADN service by inserting the intermediate SMF and the intermediate UPF.
  • the service area of LADN is a subset of the service area of the anchor SMF, that is, the service area of LADN is included in the service area of the anchor SMF, and when the UE moves out of the service area of the anchor SMF At the same time, the UE must also move out of the service area of LADN at the same time.
  • the difference between this embodiment and the embodiment in FIG. 3 is that if the handover fails during the handover process, additional processing may be required, such as releasing or deactivating the LADN session.
  • Steps S401 to S408 of the present application are similar to steps S301 to S308 in FIG. 3, and related descriptions can be referred to above. To avoid repetition, details are not repeated here. It should be noted that the session activation described in relation to the steps in FIG. 3 should be correspondingly understood as session switching in the embodiment.
  • the corresponding process further includes the following steps:
  • the intermediate SMF After the intermediate SMF rejects the session corresponding to the session identifier, the intermediate SMF sends a second message to the AMF, and the second message includes information about the reason for rejecting the current LADN session.
  • the intermediate SMF rejecting the session corresponding to the session identifier is rejecting the session switching corresponding to the session identifier, and the reason information is used to indicate the reason why the intermediate SMF refuses to switch the session corresponding to the session identifier.
  • the AMF After the AMF receives the second message, it also includes the following steps:
  • S409 The AMF sends a handover command to the RAN.
  • the handover command sent by the AMF to the RAN includes handover failure indication information
  • the handover failure indication information may be used to indicate that when the session corresponding to the session identifier is a LADN session, the session switch fails or is not accepted, or the handover process is terminated, etc. .
  • the switching command may also include failure reason information.
  • the failure reason information may be that the LADN session refuses to insert the intermediate SMF and the intermediate UPF, for example.
  • the AMF sends a session release request message to the anchor SMF.
  • the LADN session is deactivated or released. It should be understood that the release or deactivation process of the LADN session by the anchor SMF can refer to the prior art, which will not be repeated here.
  • the execution subject of the embodiment of the present application is the anchor SMF, that is, when the anchor SMF determines to reject the session, it further includes steps S411 to S417, wherein steps S411 to S415 and steps S309 to S313 in FIG. 3 Similarly, the specific description can be referred to above, in order to avoid repetition, it will not be repeated here.
  • the anchor SMF rejected session is the session corresponding to the anchor SMF rejected switching session identifier.
  • the execution subject is the anchor SMF, the following steps are also included:
  • S416 The AMF sends a handover command to the RAN.
  • the handover command sent by the AMF to the RAN includes failure indication information, and the failure indication information may be used to indicate that the session handover fails or is not accepted, or the handover procedure is terminated.
  • the switching command may also include failure reason information.
  • the failure reason information may be that the LADN session refuses to insert the intermediate SMF and the intermediate UPF, for example.
  • the AMF sends a session release request message to the anchor SMF.
  • the LADN session is deactivated or released. It should be understood that the release or deactivation process of the LADN session by the anchor SMF can refer to the prior art, which will not be repeated here.
  • Fig. 5 shows a schematic flowchart of a session processing method in an embodiment of the present application.
  • the session processing method is suitable for the handover procedure caused by the movement of the UE, for example, the process in which the UE moves out of the service area of the LADN or the UE moves out of the service area of the anchor SMF. Including step S510, step S520 and step 530.
  • the first intermediate SMF receives first indication information.
  • the first indication information is used to indicate that the DNN corresponding to the current session is a LADN or is used to indicate that the current session is a LADN session.
  • the first intermediate SMF is the target intermediate SMF to be inserted, that is, there is no intermediate SMF in the LADN session before the UE moves, and after the UE moves, especially after moving out of the service area of the anchor SMF , You need to insert an intermediate SMF, which is the target intermediate SMF.
  • the first intermediate SMF is the target intermediate SMF after the handover.
  • the source intermediate SMF can be the intermediate SMF before the intermediate SMF handover process
  • the target intermediate SMF can be the intermediate SMF after the intermediate SMF handover process, that is, the new intermediate SMF. It should be understood that the target intermediate SMF may not be configured with LADN information.
  • the first intermediate SMF can be inserted, switched or removed as required.
  • the first indication information received by the first intermediate SMF may be sent by different network elements.
  • the network element that sends the first indication information may be a source AMF, a target AMF, an anchor SMF, or a source intermediate SMF.
  • the source AMF is the AMF before the UE does not undergo AMF handover, that is, the old AMF, and the source AMF is configured with LADN information
  • the target AMF is the AMF after the UE undergoes AMF handover, that is For a new AMF, LADN information may not be configured on the target AMF, where the LADN information may be, for example, the service area of the LADN or other information related to the LADN.
  • S520 The first intermediate SMF rejects the current session.
  • the first intermediate SMF determines that the UE is outside the service area of the LADN.
  • the first intermediate SMF may directly reject the session, that is, the first intermediate SMF releases or deactivates the LADN session.
  • the first SMF may send a message to the AMF, and the message carries reason information.
  • the first intermediate SMF sends second indication information to the anchor SMF.
  • the second indication information may not be sent to the anchor SMF.
  • the second indication information used to indicate that the UE is outside the service area of the LADN is sent to the anchor SMF.
  • the first intermediate SMF when the LADN information is not configured on the target AMF, the first intermediate SMF will not send the indication information whether the UE is within the service area of the LADN, because the first intermediate SMF knows the current The session is a LADN session, so it can be determined that the UE moves out of the service area of the LADN, and the second indication information is sent to the anchor SMF.
  • the first intermediate SMF forwards the indication information to the anchor SMF.
  • the target AMF can determine that the UE moves out of the service area of LADN according to the service area of the LADN and the location of the UE, and send to the first intermediate SMF to instruct the UE to move out of the service area of LADN The second instruction information.
  • the second indication information may be, for example, that the UE presence in LADN indicates "IN” or "OUT".
  • the indication is "OUT"
  • it indicates that the UE is outside the service area of LADN
  • the indication is "IN”
  • the anchor SMF learns that the UE has moved out of the service area of the LADN according to the second indication information, and can release or deactivate the LADN session established by the UE. Specifically, the anchor SMF may send a message for deactivating the LADN session to the target AMF, or the anchor SMF may send a message for instructing the release of the N3 tunnel information of the LADN session to the A-UPF.
  • FIG. 6 is a schematic flowchart of a session processing method according to an embodiment of the application.
  • This embodiment is applicable to scenarios where AMF handover occurs and the intermediate SMF remains unchanged.
  • the source AMF manages the UE’s access and mobile services, and the RAN to which the UE is attached is connected to the anchor point UPF controlled by the anchor SMF through the intermediate UPF controlled by the first intermediate SMF; when the UE undergoes the AMF handover, the source AMF detects that it can no longer serve the UE, and selects the target AMF as the new AMF to serve the UE, that is, the AMF is switched.
  • the first intermediate SMF does not switch, that is, the RAN to which the UE is attached is still controlled by the first intermediate SMF.
  • the middle UPF is connected with the anchor UPF controlled by the anchor SMF.
  • S601 The source RAN sends handover request information to the target RAN.
  • the UE when the UE is farther and farther from the source RAN and closer and closer to the target RAN, the UE can obtain a better signal from the target RAN. Therefore, the source RAN selects the target RAN and sends a handover request to the target RAN news.
  • the handover request information is used to request the target RAN for the UE to switch to the target RAN.
  • the switching request message may carry information about the LADN session to be switched, for example, a session identifier corresponding to the LADN session or a list of session identifiers corresponding to multiple LADN sessions. It should be understood that the handover request message may also include the session identifier corresponding to the non-ALDN session, but it is not within the scope of the embodiments of the present application, and therefore is not specifically described. This embodiment does not limit the number of LADN sessions.
  • the source AMF sends a request message for creating a UE context to the target AMF.
  • the source AMF selects the target AMF as the new AMF to serve the UE.
  • the selection process of the target AMF can refer to the existing process, which will not be repeated here.
  • the request message for creating the UE context sent by the source AMF to the target AMF is used to request the target AMF to create the UE context.
  • the request message for creating a UE context may carry UE context information stored on the source AMF, and the UE context information may include, for example, DNN, SMF, etc. corresponding to the LADN session identifier.
  • the target AMF sends a session creation/update request message to the first intermediate SMF.
  • the first intermediate SMF does not handover.
  • LADN information is configured on the first intermediate SMF.
  • the LADN information may be, for example, that the DNN corresponding to the current session is a LADN or the current session is a LADN session.
  • the session creation/update request message includes the first AMF identifier.
  • the first intermediate SMF sends a reply message for the session creation request message or the update request message to the target AMF.
  • the reply message sent by the first intermediate SMF to the target AMF may also include a direct forwarding instruction, indicating that the source RAN directly forwards data to the target RAN; or
  • the reply message may also be the uplink tunnel information of the I-UPF selected and inserted by the first intermediate SMF, such as the IP address or the tunnel endpoint of the I-UPF.
  • the target AMF sends a handover request message to the target RAN.
  • the target AMF after receiving the uplink tunnel information of the I-UPF sent by the first intermediate SMF, the target AMF sends a handover request message to the target RAN, where the request message is used to request the target RAN for the UE to access the target RAN.
  • the handover request message may carry I-UPF uplink tunnel information.
  • the handover request message carries the uplink tunnel information of the multiple I-UPFs.
  • the target RAN sends a handover request confirmation message to the target AMF.
  • the target RAN after receiving the handover request message sent by the target AMF, the target RAN creates a corresponding resource on the target RAN, and sends a handover request confirmation message to the target AMF.
  • the resources created by the target RAN may include N3 tunnel downlink resources, and the N3 tunnel downlink resources may be, for example, the IP address of the target RAN or the N3 tunnel endpoint number.
  • the handover request confirmation message sent by the target RAN to the target AMF includes the N3 tunnel downlink resource created by the target RAN.
  • the target AMF sends a create context response message to the source AMF.
  • the target AMF when the resources on the target RAN and the target AMF are created, the target AMF sends a create context response message to the source AMF.
  • the create context response message is used by the target AMF to indicate to the source AMF that the resources on the target RAN and the target AMF have been created. Created.
  • the create context response message sent by the target AMF to the source AMF may also be used to request the source RAN in the LADN to perform the operation of switching the UE from the source RAN to the target RAN.
  • S607 The UE is handed over from the source RAN to the target RAN.
  • the specific process of the UE handover from the source RAN to the target RAN can refer to the existing process, which will not be repeated here.
  • the target RAN sends a handover notification message to the target AMF.
  • the target RAN sends a handover notification message to the target AMF after the UE completes the handover process, and the handover notification message is used to indicate to the target AMF that the UE has successfully switched to the target RAN.
  • the target AMF sends a session update message to the first intermediate SMF.
  • the session creation request message or the session update request message is the third message.
  • the session update message sent to the first intermediate SMF does not include indication information for indicating that the UE is outside the service area of the LADN.
  • the first intermediate SMF determines that the UE is outside the service area of the LADN.
  • the first intermediate SMF may determine that the current session is a LADN session or the DNN corresponding to the current session is a LADN.
  • the manner in which the first intermediate SMF learns that the current session is a LADN session or that the DNN corresponding to the current session is a LADN may include: the source AMF notifies the first intermediate SMF of LADN information; or, when inserting the first intermediate SMF, An intermediate SMF obtains the session context from the anchor SMF, and the session context includes indication information indicating that the DNN corresponding to the current session is a LADN or the current session is a LADN session. It should be understood that the first intermediate SMF can learn the information of the LADN in many other ways, which are not limited in this embodiment.
  • the second message sent by the target AMF received by the first intermediate SMF does not include indication information for indicating that the UE is outside the service area of LADN, since the first intermediate SMF can determine that the current session is a LADN session, then The first intermediate SMF determines that the UE is no longer outside the service area of the LADN.
  • the second message may be a session update message.
  • the first intermediate SMF may directly reject the session, that is, the first intermediate SMF releases or deactivates the LADN session. In this case, this embodiment may Steps S611 and S612 are skipped.
  • the first intermediate SMF may send a notification message to the AMF, and the message carries reason information.
  • the first intermediate SMF sends second indication information to the anchor SMF.
  • the anchor SMF may perform the operation of releasing or deactivating the session.
  • the first intermediate SMF determines that the UE moves out of LADN, it sends second indication information to the second SMF, where the second indication information is used to instruct the UE to move out of LADN.
  • the second indication information may be an indication that the UE presence in LADN is "OUT".
  • the anchor SMF performs an operation of releasing or deactivating the first session.
  • the anchor SMF may perform the operation of releasing or deactivating the session.
  • the second SMF learns that the UE moves out of the LADN according to the second indication information, and can release or deactivate the LADN session established by the UE. Specifically, the SMF may send a message for deactivating the LADN session to the AMF, or the SMF may send a message for instructing the release of the N3 tunnel information of the LADN session to the UPF.
  • the operation of releasing or deactivating the session performed by the second SMF can refer to the prior art, which will not be repeated here.
  • FIG. 7 is a schematic flowchart of another session processing method according to an embodiment of the application.
  • This embodiment is applicable to a scenario where the AMF is handed over, and the intermediate SMF after the handover is a new intermediate SMF that is inserted.
  • the movement of the UE triggers the handover process, where the AMF is switched, the source AMF (that is, the old AMF) is configured with LADN information, and the UE establishes a LADN session in the service area of the LADN.
  • the AMF switches to The target AMF (that is, the new AMF), and no LADN information is configured on the target AMF.
  • the handover procedure also includes the following two specific scenarios: (1) The LADN session before the handover has no intermediate SMF (that is, the source intermediate SMF is not involved).
  • the UE moves out of the service area of the anchor SMF, so The first intermediate SMF needs to be inserted; (2) The LADN session before the handover has an intermediate SMF (that is, the source intermediate SMF). After the handover, the source intermediate SMF needs to be switched to the new intermediate SMF, that is, to the target intermediate SMF .
  • the specific implementation process of this embodiment is shown in Figure 7, and the description of each step is as follows:
  • Step S701 is similar to step S601 in FIG. 6, and the specific implementation method can refer to the description of S601 above. To avoid repetition, details are not described herein again.
  • the source AMF sends a UE context creation request message to the target AMF.
  • the target AMF is selected as the new AMF to serve the UE.
  • the selection process of the first AMF can refer to the existing process, which will not be repeated here.
  • the UE context creation request message is used to request the target AMF to create the UE context, where the UE context creation request message may also carry UE context information stored on the source AMF, and the UE context information may include, for example, : DNN, SMF, etc. corresponding to the PDU session identifier.
  • first indication information is added, and the first indication information is used to indicate that the DNN of the current session is the LADN or the current session is the LADN session. It should be understood that when the LADN information is not configured on the target AMF, the target AMF may learn that the current session is an LADN session according to the first indication information.
  • the target AMF can determine whether the UE moves out according to the location of the UE and the service area of the LADN LADN's service area.
  • the target AMF may determine that the UE is outside the service area of the LADN.
  • Steps S703 to S708 are similar to steps S603 to S608 in FIG. 6, and the specific implementation method can refer to the description of the corresponding steps above, and to avoid repetition, details are not repeated here.
  • the target AMF sends a session update message to the first intermediate SMF, where the session update message includes second indication information for indicating that the UE is located outside the service area of the LADN.
  • the session creation request message or the session update request message is the third message.
  • the second message sent to the first intermediate SMF includes second indication information, and the second indication information is used to indicate to the first SMF that the UE is located Outside the service area of LADN.
  • the second indication information may be, for example, that the UE presence in LADN indicates "OUT".
  • the first intermediate SMF is the target intermediate SMF after the handover.
  • the UE moves out of the service area of the anchor SMF during the movement, and the first intermediate SMF at this time is the inserted target intermediate SMF.
  • S710 The first intermediate SMF rejects the current session.
  • the first intermediate SMF learns that the current session is a LADN session or the DNN corresponding to the current session is a LADN according to steps S704 and S705. If in step S709, the first intermediate SMF receives that the message sent by the target AMF does not include Based on the indication information indicating that the UE is outside the LADN service area, the first intermediate SMF can determine that the UE is outside the LADN service area.
  • step S702 after the target AMF learns that the current session is a LADN session according to the first indication information, if the target AMF is not configured with information such as the service area of LADN, the target AMF can determine that the UE is outside the service area of LADN If in step S709, the first intermediate SMF receives that the message sent by the target AMF includes indication information for indicating that the UE is outside the LADN service area, the first intermediate SMF can determine that the UE is outside the LADN service area .
  • the first intermediate SMF may directly reject the current session, that is, the first intermediate SMF releases or deactivates the LADN session, at this time in this embodiment Steps S711 and S712 are skipped.
  • Step S711 The first intermediate SMF forwards the second indication information to the anchor SMF.
  • the anchor SMF may perform the operation of releasing or deactivating the session.
  • the first intermediate SMF determines that the UE moves out of LADN, it sends second indication information to the second SMF, where the second indication information is used to instruct the UE to move out of LADN.
  • the second indication information may be an indication that the UE presence in LADN is "OUT".
  • the anchor SMF performs an operation of releasing or deactivating the first session.
  • the anchor SMF may perform the operation of releasing or deactivating the session.
  • the second SMF learns that the UE moves out of the LADN according to the second indication information, and can release or deactivate the LADN session established by the UE. Specifically, the SMF may send a message for deactivating the LADN session to the AMF, or the SMF may send a message for instructing the release of the N3 tunnel information of the LADN session to the UPF.
  • the operation of releasing or deactivating the session performed by the second SMF can refer to the prior art, which will not be repeated here.
  • the source AMF sends the LADN session indication information to the target AMF, so that the AMF can learn that the current session is a LADN session, and further sends the indication information of the UE moving out of the service area of LADN to the anchor SMF through the intermediate SMF, so that there are two
  • the intermediate SMF or anchor SMF can be deactivated or the current session can be released to save the service resources of LADN.
  • FIG. 8 is a schematic flowchart of yet another session processing method according to an embodiment of the application. Including step S801 to step S811. For ease of understanding, a brief introduction to the applicable scenarios of this embodiment is given.
  • This embodiment can be applied to the handover process caused by the movement of the UE, where the AMF is handed over, the AMF before the handover is the source AMF, and the LADN information is configured on the source AMF, and the AMF after the handover is the target AMF, and the target AMF No LADN information is configured on the above.
  • the UE Before the handover occurs, the UE establishes a LADN session within the service area of the LADN, and the LADN session has an intermediate SMF (that is, the source intermediate SMF) before the handover, and needs to be switched to a new intermediate SMF (that is, the target intermediate SMF) after the handover.
  • the specific implementation process of this embodiment is shown in Figure 6, and the description of each step is as follows:
  • Steps S801 to S803 are similar to steps S601 to S603 in FIG. 6.
  • steps S601 to S603 please refer to the description of S601 to S603 above. To avoid repetition, details are not repeated here.
  • the source intermediate SMF sends first indication information to the target intermediate SMF.
  • the source intermediate SMF may send a session context to the target SMF, and the session context includes first indication information, where the first indication information is used to indicate that the DNN corresponding to the current session is a LADN or the current session is a LADN session.
  • the target intermediate SMF can learn that the current session is a LADN session according to the source intermediate SMF.
  • the method for the source intermediate SMF to obtain the current session as a LADN session or to obtain the first indication information may include: when inserting the source intermediate SMF, the source intermediate SMF obtains the session context from the anchor SMF, and the session context includes instructions for indicating the current The DNN corresponding to the session is the indication information of LADN or the current session is the LADN session; or, in the scenario of an intermediate SMF handover, the source intermediate SMF obtains the session context from the intermediate SMF before the handover, and the session context includes information for indicating the current session corresponding DNN is the indication information of LADN or the current session is LADN session; or, when inserting the source intermediate SMF, the source AMF notifies the source intermediate SMF of the indication information that the DNN corresponding to the current session is LADN or the current session is LADN session; or, the source intermediate SMF The SMF may be pre-configured with information related to the LADN session. It should be understood that the way for the source intermediate SMF to obtain that the current session is the LADN session
  • S805 to S809 are similar to S604 to S608 in FIG. 6, and the specific implementation process can be referred to the description of S604 to S608 above, and to avoid repetition, it will not be repeated here.
  • the target AMF sends a session update message to the first intermediate SMF.
  • the session creation request message or the session update request message is the third message.
  • no information related to LADN is configured on the target AMF, so the session update message sent to the target intermediate SMF does not include the indication information of whether the UE moves out of the LADN.
  • the target intermediate SMF learns that the current session is a LADN session according to the first indication information in step S604. Therefore, when the target intermediate SMF does not receive the indication information sent by the target AMF indicating whether the UE moves out of LADN, the target intermediate SMF can determine The UE has moved out of the service area of LADN.
  • S811 The first intermediate SMF rejects the current session.
  • the first intermediate SMF learns that the current session is a LADN session or the DNN corresponding to the current session is LADN according to step 804, if the first intermediate SMF receives the second message sent by the target AMF in step S810, the second message used to indicate that the UE is not included Indicating information within the service area of LADN, the first intermediate SMF determines that the UE is not within the service area of LADN.
  • the first intermediate SMF may directly reject the session, and the first intermediate SMF releases or deactivates the LADN session.
  • step S812 is skipped in this embodiment.
  • the first SMF can send a message to the AMF, and the message carries reason information.
  • the specific method refer to the description in Embodiment 3 and Embodiment 4.
  • Step S812 The first intermediate SMF forwards the second indication information to the anchor SMF.
  • the anchor SMF may perform the operation of releasing or deactivating the session.
  • the first intermediate SMF determines that the UE moves out of LADN, it sends second indication information to the second SMF, where the second indication information is used to instruct the UE to move out of LADN.
  • the second indication information may be an indication that the UE presence in LADN is "OUT".
  • the anchor SMF performs an operation of releasing or deactivating the first session.
  • the anchor SMF may perform the operation of releasing or deactivating the session.
  • the second SMF learns that the UE moves out of the LADN according to the second indication information, and can release or deactivate the LADN session established by the UE. Specifically, the SMF may send a message for deactivating the LADN session to the AMF, or the SMF may send a message for instructing the release of the N3 tunnel information of the LADN session to the UPF.
  • the operation of releasing or deactivating the session performed by the second SMF can refer to the prior art, which will not be repeated here.
  • FIG. 9 shows a schematic flowchart of another method for processing a session according to an embodiment of the present application.
  • This embodiment is suitable for the movement process of the idle state UE. Specifically, after the UE moves out of the service area of the source AMF, the re-registration procedure is re-initiated, where the UE switches from the source AMF to the target AMF, the source AMF is configured with LADN information, and the target AMF is not configured with LADN information.
  • the UE When the UE is served by the source AMF, the UE establishes a session within the service area of LADN, and the session becomes deactivated when the UE becomes idle. The UE carries the session identifier in the registration request for re-registration to request activation of the session . After the UE moves, the intermediate SMF needs to be switched or inserted.
  • the session processing method shown in FIG. 9 includes steps S901 to S909.
  • S901 The UE sends a registration request message to the target RAN.
  • the idle state UE initiates a registration request to the target RAN requesting access after moving to the target RAN.
  • the registration request message sent by the UE carries the session identifier to be activated and the corresponding context, where the DNN corresponding to the session identifier may be LADN or other network types.
  • the DNN corresponding to the session identifier is LADN Make an introduction.
  • the target RAN selects the target AMF.
  • the target RAN selects the target AMF that serves the UE.
  • the process of T-RAN selecting the target AMF can refer to the existing process, which will not be repeated here.
  • S903 The target RAN sends a registration request message to the target AMF.
  • the target RAN forwards the registration request message received in step S702 to the target AMF.
  • the registration request message may include information such as a session identifier to be activated, and the DNN corresponding to the session identifier is LADN.
  • S904 The target AMF sends a context request message to the source AMF.
  • the registration request message received by the target AMF when the registration request message received by the target AMF includes the information of the session identifier to be activated, it requests the source AMF to obtain the context information of the UE session.
  • S905 The source AMF sends a response message for the context request message to the target AMF.
  • the response message includes first indication information, for example, the DNN corresponding to the session identifier of the LADN session is LADN or a certain session is a LADN session.
  • the target AMF selects the first intermediate SMF.
  • the target AMF may learn LADN information according to the received first indication information.
  • the target AMF determines that the UE moves out of the service area of the LADN.
  • the source intermediate SMF is the intermediate SMF before the handover
  • the target intermediate SMF is the intermediate SMF after the handover.
  • the first intermediate SMF is also the target intermediate SMF after the handover.
  • the first intermediate SMF is the inserted target intermediate SMF.
  • the target AMF sends a session creation request or session update request message to the first intermediate SMF.
  • the first AMF chooses to insert the first intermediate SMF or switch the first intermediate SMF, it sends a corresponding session creation request message or a session update request message to it.
  • the target AMF may determine that the session is a LADN session according to the first indication information sent and received in step S905.
  • the target AMF can determine that the UE has moved out of the service area of the LADN.
  • the target AMF may include second indication information in the session creation/update request message, and the second indication information is used to indicate that the UE is outside the service area of the LADN.
  • the second indication information may be, for example, that the UE presence in LADN indicates "OUT".
  • the second indication information may be included in the session update request message or the session creation request message sent by the target AMF to the first intermediate SMF.
  • the target AMF sends a session update request message to the first intermediate SMF; in a scenario where the intermediate SMF is newly inserted, the target AMF sends a session switch request message to the first intermediate SMF.
  • the session update request message or the session creation request message sent by the target AMF to the first intermediate SMF may carry information that the UE presence in LADN is indicated as "OUT".
  • the target AMF may also send first indication information to the first intermediate SMF to notify the first intermediate SMF that the DNN corresponding to the current session identifier is the LADN or the current session is the LADN session.
  • the first intermediate SMF sends second indication information to the anchor SMF.
  • the second indication information is forwarded to the anchor SMF.
  • the second indication information is used to instruct the UE to move out of the service area of LADN.
  • the first intermediate SMF forwards the session update request message or the session creation request message received in step S707 to the anchor SMF, and the session update request message or the session creation request message carries the second indication information.
  • the session update request message or the session creation request message carries the indication information that the UE present in LADN is "OUT".
  • an operation of deactivating or releasing the session is triggered.
  • the process of deactivating the session or releasing the session by the anchor SMF can refer to the existing process, which will not be repeated here.
  • FIG. 10 shows a schematic flowchart of yet another session processing method provided by an embodiment of the present application.
  • This embodiment is applicable to a scenario where a UE in an idle state initiates a service request after moving. Specifically, when the idle state UE moves out of the service area of the source AMF, and the UE initiates a service request process, the AMF is switched from the source AMF to the target AMF. Wherein, when the UE is served by the source AMF, a session is established in the service area of the LADN, but the session becomes inactive when the UE becomes idle. In addition, LADN information is configured on the source AMF, and LADN information is not configured on the target AMF. In this embodiment, the UE needs to switch the intermediate SMF or insert the intermediate SMF after moving.
  • the session processing method shown in FIG. 10 includes steps S1001 to S1009.
  • the source AMF that originally served the UE is switched to the target AMF.
  • the LADN information may not be configured on the target AMF.
  • the target AMF can choose to insert a first intermediate SMF, and the first intermediate SMF selects an intermediate UPF to connect to the anchor UPF.
  • the target AMF may re-select an intermediate SMF, and the first intermediate SMF selects an intermediate UPF to connect to the anchor UPF.
  • S1001 The UE sends a service request message to the target RAN.
  • the idle state UE initiates a service request to the target RAN requesting access after moving to the target RAN.
  • the service request message sent by the UE carries the session identifier to be activated, where the DNN corresponding to the session identifier may be LADN or other network types.
  • the DNN corresponding to the session identifier may be LADN or other network types. This embodiment only introduces when the DNN corresponding to the session identifier is LADN.
  • the target AMF receives the service request message sent by the target RAN.
  • the service request message may include indication information of whether the UE is located outside the LADN service area and location information of the UE. If the LADN information is not configured on the target AMF, the indication information is not included. It is worth noting that this step may also involve the interaction between the target RAN and the source RAN, and/or the interaction between the target AMF and the source AMF, all of which are in the prior art and will not be described in detail.
  • the target AMF selects the first intermediate SMF.
  • the target AMF detects that the UE has moved out of the service area of the anchor SMF, the target AMF selects and inserts the first intermediate SMF, or the target AMF detects that the UE has moved out of the service range of the source intermediate SMF, the target AMF selects the first intermediate SMF for intermediate SMF switching, that is, switching from the source intermediate SMF to the first intermediate SMF.
  • the target AMF sends a session creation request message to the first intermediate SMF.
  • the session creation request message is used to request the establishment of a session context on the first intermediate SMF.
  • the session creation request message includes information indicating whether the UE is located within the service area of the LADN.
  • S1005 The first intermediate SMF requests to obtain the session context.
  • the target AMF detects that the UE has moved out of the service area of the anchor SMF, and then requests the anchor SMF for the session context.
  • the session context contains information indicating that the DNN corresponding to the current session is LADN or the current session is LADN session
  • the target AMF detects that the UE has moved out of the service area of the source intermediate SMF, and then requests the source intermediate SMF for the session context.
  • the session context contains information indicating that the DNN corresponding to the current session is LADN or the current session is LADN Conversation.
  • the first intermediate SMF determines that the UE is not within the service area of the LADN.
  • the first intermediate SMF learns that the current session is a LADN session or the DNN corresponding to the current session is LADN according to step S1005. If the first intermediate SMF receives in step S1004, the message sent by the target AMF does not include a message for indicating that the UE is in LADN. The first intermediate SMF determines that the UE is outside the service area of LADN.
  • the first intermediate SMF may directly reject the session, and the first intermediate SMF releases or deactivates the LADN session. At this time, this embodiment does not involve step S1007 And S1008.
  • the first SMF may also send a message to the AMF, and the message carries reason information.
  • the specific method refer to the description in Embodiment 3 and Embodiment 4.
  • Step S1007 The first intermediate SMF forwards the second indication information to the anchor SMF.
  • the anchor SMF may perform the operation of releasing or deactivating the session.
  • the first intermediate SMF determines that the UE moves out of LADN, it sends second indication information to the second SMF, where the second indication information is used to instruct the UE to move out of LADN.
  • the second indication information may be an indication that the UE presence in LADN is "OUT".
  • the anchor SMF performs an operation of releasing or deactivating the first session.
  • the anchor SMF may perform the operation of releasing or deactivating the session.
  • the operation of releasing or deactivating the session performed by the second SMF can refer to the prior art, which will not be repeated here.
  • FIG. 11 shows a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • the communication device 1100 shown in FIG. 11 may correspond to the intermediate session management network element SMF described in the embodiment of FIG. 1.
  • the communication device 1100 may include: a first receiving module 1101 and a first processing module 1102.
  • the first receiving module 1101 may be configured to receive a request message sent by the access mobility management network element AMF, where the request message includes the session identifier.
  • the first processing module 1102 may be configured to reject the session corresponding to the session identifier when the session corresponding to the session identifier is a LADN session.
  • the communication device 1100 may further include: a second processing module, configured to determine that the session is a LADN session according to the session context obtained from the anchor SMF, the session context including a first indication for indicating that the session is the LADN session information.
  • a second processing module configured to determine that the session is a LADN session according to the session context obtained from the anchor SMF, the session context including a first indication for indicating that the session is the LADN session information.
  • the communication device 1100 may further include: a third processing module, configured to determine that the session is an LADN session according to the second indication information sent by the AMF, and the second indication information is used to instruct the UE to move out of the LADN service area.
  • a third processing module configured to determine that the session is an LADN session according to the second indication information sent by the AMF, and the second indication information is used to instruct the UE to move out of the LADN service area.
  • the communication device 1100 may further include: a first sending module, configured to send a first message to the AMF, where the first message includes cause information.
  • a first sending module configured to send a first message to the AMF, where the first message includes cause information.
  • the reason information includes that the LADN session refuses to insert an intermediate SMF and an intermediate user plane network element UPF.
  • FIG. 12 shows a schematic structural diagram of a communication device provided by another embodiment of the present application.
  • the communication device 1200 shown in FIG. 12 may correspond to the AMF described in the embodiment in FIG. 1.
  • the communication device 1200 may include: a first sending module 1201 and a first receiving module 1202.
  • the first sending module 1201 sends a request message to an intermediate SMF, where the request message includes a session identifier, where the intermediate SMF is the SMF selected by the AMF when the UE moves out of the service area of the anchor SMF.
  • the first receiving module 1202 is configured to receive a first message sent by the intermediate SMF, where the first message includes cause information.
  • the communication device 1200 may further include a second sending module, configured to send cause information to the radio access network RAN.
  • a second sending module configured to send cause information to the radio access network RAN.
  • the communication device 1200 may further include a third sending module, configured to send a session release request message to the anchor SMF, where the session release request message is used to request the anchor SMF to release the LADN session.
  • a third sending module configured to send a session release request message to the anchor SMF, where the session release request message is used to request the anchor SMF to release the LADN session.
  • FIG. 13 shows a schematic structural diagram of a communication device provided by another embodiment of the present application.
  • the communication device 1300 shown in FIG. 13 may correspond to the anchor SMF described in the method shown in FIG. 1 or FIG. 2.
  • the communication device 1300 may include: a first receiving module 1301 and a first processing module 1302.
  • the first receiving module 1301 is configured to receive a request message sent by an intermediate SMF, where the request message includes a session identifier, where the intermediate SMF is the SMF selected by the AMF when the UE moves out of the service area of the anchor SMF.
  • the first processing module 1302 is configured to: when the session corresponding to the session identifier is a LADN session, the first processing module 1302 rejects the session corresponding to the session identifier, where the LADN session is the anchor SMF Service session.
  • the communication device 1300 may further include a second processing module, configured to determine that the current session is a LADN session according to the session context.
  • the communication device 1300 may further include a second processing module, configured to determine that the current session is a LADN session according to configuration information, where the configuration information includes that the DNN corresponding to the current session is LADN.
  • a second processing module configured to determine that the current session is a LADN session according to configuration information, where the configuration information includes that the DNN corresponding to the current session is LADN.
  • the communication device 1300 may further include a second sending module, configured to send a second message to the intermediate SMF, the second message including reason information, and the reason information is used to indicate that the session activation fails.
  • a second sending module configured to send a second message to the intermediate SMF, the second message including reason information, and the reason information is used to indicate that the session activation fails.
  • the first processing module rejects the session corresponding to the session identifier, including: releasing the session corresponding to the session identifier; or deactivating the session corresponding to the session identifier; or, refusing to activate or switch the session The session corresponding to the session ID.
  • FIG. 14 shows a schematic structural diagram of a communication device provided by another embodiment of the present application.
  • the communication device 1400 shown in FIG. 13 may correspond to the first intermediate SMF described above.
  • the communication device 1400 may include: a first receiving module 1401 and a first sending module 1402.
  • the first receiving module 1401 is configured to receive first indication information, where the first indication information is used to indicate that the data network name DNN corresponding to the current session is LADN.
  • the first sending module 1402 is configured to send second indication information to the anchor SMF, where the second indication information is used to indicate that the UE is outside the service area of LADN, and the anchor SMF is the current The anchor SMF of the session.
  • the communication device 1400 may further include: a second receiving module, configured to receive the third message sent by the target AMF.
  • the communication device 1400 may further include: a first processing module, configured to determine that the UE is in the LADN when the third message does not include the indication information that the UE is outside the service area of the LADN Outside the service area, the target AMF is the AMF to which the UE is handed over.
  • a first processing module configured to determine that the UE is in the LADN when the third message does not include the indication information that the UE is outside the service area of the LADN Outside the service area, the target AMF is the AMF to which the UE is handed over.
  • the communication device 1400 may further include: a second sending module, configured to send the second indication information to the anchor SMF when the second message includes that the UE is outside the service area of the LANF .
  • a second sending module configured to send the second indication information to the anchor SMF when the second message includes that the UE is outside the service area of the LANF .
  • the first indication information is sent by any of the following network elements: the source AMF, the target AMF, the anchor SMF, or a second intermediate SMF, and the second intermediate SMF is used to control the interface with the source base station The middle UPF.
  • FIG. 15 shows a schematic structural diagram of a communication device provided by another embodiment of the present application.
  • the communication device 1500 shown in FIG. 14 may correspond to the aforementioned target AMF.
  • the communication device 1500 may include: a first receiving module 1501 and a first sending module 1502.
  • the first receiving module 1501 is configured to receive first indication information sent by the source AMF, where the first indication information is used to indicate that the DNN corresponding to the current session is an LADN.
  • the first sending module 1502 is configured to send second indication information to the first intermediate SMF when the target AMF determines that the UE moves out of the area served by the LADN, and the second indication information is used to indicate the The UE is outside the service area of the LADN, and the first intermediate SMF is used to control the intermediate UPF of the interface with the target base station.
  • the communication apparatus 1500 may further include: a first processing module, configured to determine that the UE moves out of the service area of the LADN.
  • the first processing module determining that the UE moves out of the service area of the LADN includes: when the information of the LADN is not configured on the target AMF, determining that the UE moves out of the service area of the LADN.
  • the first processing module determining that the UE moves out of the service area of the LADN includes: when the target AMF is configured with the information of the LADN, determining the location according to the information of the LADN and the location of the UE The UE moves out of the service area of the LADN.
  • the information of the LADN includes service area information of the LAND.
  • FIG. 16 shows a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • the communication device 1600 shown in FIG. 16 may correspond to the intermediate SMF or anchor SMF or AMF involved in the session processing method described above.
  • the communication device 1600 includes at least one processor 1601 and a communication interface 1602.
  • the communication interface 1602 can be used for the communication device 1600 to exchange information with other communication devices.
  • program instructions are executed in the at least one processor 1601
  • the communication device 1600 implements the steps or methods or operations or functions performed by the intermediate SMF or anchor SMF or AMF in the foregoing.
  • the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, rather than corresponding to the embodiments of the present application.
  • the implementation process constitutes any limitation.
  • the disclosed system, device, and method 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, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application essentially or the part that contributes to the existing technology 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 method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program code .

Abstract

本申请提供了一种会话处理的方法、通信装置及通信系统。该会话处理的方法包括：中间会话管理网元SMF接收接入移动管理网元AMF发送的请求消息，所述请求消息包括会话标识，其中，所述中间会话管理网元SMF为用户设备UE移出锚点SMF的服务区域时所述AMF选择的SMF；当所述会话标识对应的会话为本地区域数据网络LADN会话时，所述中间SMF拒绝所述会话标识对应的会话。本申请提供的技术方案可以实现在用户设备移出锚点SMF的服务区域后不能继续访问LADN的服务，从而避免LADN的服务资源浪费。

Description

会话处理的方法、通信装置及通信系统
本申请要求于2019年4月2日提交中国专利局、申请号为201910262879.X、申请名称为“会话处理的方法、通信装置及通信系统”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，具体地，尤其涉及一种会话处理的方法、通信装置及通信系统。
背景技术
本地区域数据网络(local area data network，LADN)是指覆盖特定局部区域的网络，例如覆盖企业园区、校园、机场、火车站、大型购物中心、体育馆等场所的网络。用户设备(equipment user，UE)只有在LADN网络的服务区域内时才可以通过LADN的分组数据单元(packet data unit，PDU)会话访问LADN。
UE通过无线接入访问本地用户面网元(user plane function，UPF)以实现对本地网络的直接访问，从而不需要经过除LADN之外的网络就可以从LADN获取自身常用的数据，减少了获取数据的时延和由于UE需要频繁向除LADN之外的网络请求获取数据而占用的带宽。
LADN只覆盖特定服务区域，LADN信息配置在接入与移动性管理网元(access and mobility management function，AMF)上。AMF只需配置在其服务区域的LADN信息，例如LADN的服务区域等。当UE从LADN网络移至其他网络时，UE可能会对应新的AMF，并且在目前的网络架构中，根据UE在网络切换过程中的需要，也有可能会涉及到两个SMF，例如插入中间SMF为无法访问锚点SMF的UPF的UE提供中间UPF，使得UE实现对锚点UPF进行访问。但是，当中间SMF上未配置LADN网络的信息时，其无法识别接收到的与该LADN会话相关的指示信息，进而无法向锚点SMF发送该LADN相关的指示信息，影响锚点SMF进行正常的会话操作。
因此，当会话处理流程中涉及两个SMF时，如何保证锚点SMF正常触发会话操作成为亟待解决的问题。
发明内容
本申请提供一种会话处理的方法、通信装置及通信系统，以解决存在两个会话管理网元SMF时，会话无法正常处理的问题。
第一方面，提供了一种会话处理的方法，包括：中间会话管理网元SMF接收接入移动管理网元AMF发送的请求消息，所述请求消息包括会话标识，其中，所述中间SMF为用户设备UE移出锚点SMF的服务区域时所述AMF所选择的SMF；当所述会话标识对应的会话为本地区域数据网络LADN会话时，所述中间SMF拒绝所述会话标识对应的 会话。
根据本申请实施例的会话处理方法，中间SMF获知请求的会话为LADN会话时，通过拒绝该会话，能够使得UE移出锚点SMF的服务区域后不能继续访问LADN的服务，避免了LADN服务资源的浪费。
结合第一方面，在第一方面的某些实现方式中，所述中间SMF根据锚点SMF发送的会话上下文确定所述会话为LADN会话，所述会话上下文包括用于指示所述会话为所述LADN会话的第一指示信息；或者，所述中间SMF根据所述AMF发送的第二指示信息确定所述会话为LADN会话，所述第二指示信息用于指示UE在LADN的服务区域之外。
结合第一方面，在第一方面的某些实现方式中，所述中间SMF向所述AMF发送第一消息，所述第一消息包括原因信息。
结合第一方面，在第一方面的某些实现方式中，所述原因信息包括：所述LADN会话拒绝插入中间SMF和中间用户面网元UPF。
结合第一方面，在第一方面的某些实现方式中，所述LADN会话对应的LADN的服务范围在所述锚点SMF的服务区域内。
第二方面，提供了一种会话处理的方法，包括：AMF向中间SMF发送请求消息，所述请求消息包括会话标识，其中，所述中间SMF为UE移出锚点SMF的服务区域时所述AMF选择的SMF；所述AMF接收所述中间SMF发送的第一消息，所述第一消息包括原因信息。
根据本申请实施例的会话处理方法，锚点SMF获知请求的会话为LADN会话时，通过拒绝该会话，能够使得UE移出锚点SMF的服务区域后不能继续访问LADN的服务，避免了LADN服务资源的浪费。
结合第二方面，在第二方面的某些实现方式中，所述原因信息包括：LADN会话拒绝插入中间SMF和中间用户面网元UPF。
结合第二方面，在第二方面的某些实现方式中，所述AMF向无线接入网RAN发送原因信息。
结合第二方面，在第二方面的某些实现方式中，所述AMF向锚点SMF发送会话释放请求消息，所述会话释放请求消息用于请求锚点SMF释放LADN会话。
结合第二方面，在第二方面的某些实现方式中，所述LADN会话所属的LADN在所述锚点SMF的服务区域内。
第三方面，提供了一种会话处理的方法，包括：锚点SMF接收中间SMF发送的请求消息，所述请求消息包括会话标识，其中，中间SMF为UE移出锚点SMF的服务区域时所述AMF选择的SMF；当所述会话标识对应的会话为LADN会话时，所述锚点SMF拒绝所述会话标识对应的会话，其中，所述LADN会话为所述锚点SMF服务的会话。
结合第三方面，在第三方面的某些实现方式中，所述请求消息用于请求插入中间SMF。
结合第三方面，在第三方面的某些实现方式中，所述锚点SMF根据会话上下文确定当前会话为LADN会话；或者，所述锚点SMF根据配置信息确定当前会话为LADN会话，所述配置信息包括所述当前会话对应的DNN为LADN。
结合第三方面，在第三方面的某些实现方式中，所述锚点SMF向所述中间SMF发送第二消息，所述第二消息包括原因信息，所述原因信息用于指示所述会话激活失败；或者，所述原因信息用于指示中间SMF拒绝激活所述会话。
结合第三方面，在第三方面的某些实现方式中，所述锚点SMF拒绝所述会话标识对应的会话，包括：所述锚点SMF释放所述会话标识对应的会话；或者，所述锚点SMF去激活所述会话标识对应的会话；或者，所述锚点SMF拒绝激活或者切换所述会话标识对应的会话。
结合第三方面，在第三方面的某些实现方式中，所述原因信息包括：所述LADN会话拒绝插入中间SMF和中间UPF。
结合第三方面，在第三方面的某些实现方式中，所述LADN会话对应的LADN的服务范围在所述锚点SMF的服务区域内。
第四方面，提供了一种会话处理的方法，包括：第一中间SMF接收第一指示信息，其中，第一指示信息用于指示当前会话对应的数据网络名称DNN为LADN，所述第一中间SMF用于控制与目标基站接口的中间UPF；所述第一中间SMF向锚点SMF发送第二指示信息，其中，所述第二指示信息用于指示UE处于LADN的服务区域之外，所述锚点SMF为所述当前会话的锚点SMF；所述锚点SMF根据所述第二指示信息释放所述当前会话。
根据本申请实施例的会话处理的方法，第一中间SMF根据第一指示信息获知当前会话为LADN会话，进而可以在后续识别LADN的信息，从而可以进一步对LADN会话进行处理。
结合第四方面，在第四方面的某些实现方式中，所述第一中间SMF接收目标AMF发送的第三消息；当所述第三消息不包括所述UE处于所述LADN的服务区域之外的指示信息时，所述第一中间SMF确定UE处于所述LADN的服务区域之外，所述目标AMF为所述UE切换到的AMF。
结合第四方面，在第四方面的某些实现方式中，所述第一中间SMF接收目标AMF发送的第四消息；当所述第四消息包括所述UE处于所述LANF的服务区域之外时，所述第一中间SMF向锚点SMF发送所述第二指示信息。
可选地，所述第一指示信息由以下任一网元发送：源AMF、所述目标AMF、所述锚点SMF或者第二中间SMF，所述第二中间SMF用于控制与源基站接口的中间UPF。
第五方面，提供了一种会话处理的方法，包括：目标AMF接收源AMF发送的第一指示信息，所述第一指示信息用于指示当前会话对应的DNN为LADN；当所述目标AMF确定UE移出所述LADN的服务的区域时，所述目标AMF向第一中间SMF发送第二指示信息，所述第二指示信息用于指示所述UE处于LADN的服务区域之外，所述第一中间SMF用于控制与目标基站接口的中间UPF。
应理解，当AMF发生切换流程后，新的AMF上可能未配置LADN信息，进而无法判断UE是否位于LADN的服务区域内。
根据本申请实施例的会话处理方法，通过AMF发生切换前的源AMF向目标AMF通知LADN信息，使该目标AMF获取LADN信息，从而可以进一步将该信息通知给SMF，确保了LADN会话的正常处理。
结合第五方面，在第五方面的某些实现方式中，所述目标AMF确定所述UE移出所述LADN的服务区域，包括：当所述目标AMF上未配置所述LADN的信息时，所述目标AMF确定所述UE移出所述LADN的服务区域。
结合第五方面，在第五方面的某些实现方式中，所述目标AMF确定所述UE移出所 述LADN的服务区域，包括：当所述目标AMF配置有所述LADN的信息时，所述目标AMF根据所述LADN的信息以及所述UE的位置确定所述UE移出所述LADN的服务区域。
结合第五方面，在第五方面的某些实现方式中，所述LADN的信息包括所述LAND的服务区域信息。
第六方面，提供了一种通信装置，包括至少一个处理器和通信接口，所述通信接口用于所述网络装置与其他网络装置进行信息交互，当程序指令在所述至少一个处理器中执行时，使得所述网络装置实现第一方面中任一种实现方式所述的方法在锚点SMF上的功能得以实现。
第七方面，提供了一种通信装置，包括至少一个处理器和通信接口，所述通信接口用于所述网络装置与其他网络装置进行信息交互，当程序指令在所述至少一个处理器中执行时，使得所述网络装置实现如第二方面任一种实现方式中所述的方法在锚点SMF上的功能得以实现。
第八方面，提供了一种通信装置，包括至少一个处理器和通信接口，所述通信接口用于所述网络装置与其他网络装置进行信息交互，当程序指令在所述至少一个处理器中执行时，使得所述网络装置实现如第三方面任一种实现方式中所述的方法在第一中间SMF上的功能得以实现。
第九方面，提供了一种通信装置，包括至少一个处理器和通信接口，所述通信接口用于所述网络装置与其他网络装置进行信息交互，当程序指令在所述至少一个处理器中执行时，使得所述网络装置实现如第四方面任一种实现方式中所述的方法在目标AMF上的功能得以实现。
第十方面，提供了一种通信系统，包括用于执行第一方面所述的方法的中间会话管理网元SMF和接入移动管理网元AMF。
第十一方面，提供了一种通信系统，包括用于执行第二方面所述的方法的锚点SMF、中间SMF和AMF。
第十二方面，提供了一种通信系统，包括用于执行第三方面所述的方法的第一中间SMF和锚点SMF。
第十三方面，提供了一种通信系统，包括用于执行第四方面所述的方法的源SMF和目标SMF。
第十四方面，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被通信装置(例如，终端设备或网络设备)运行时，使得该通信装置执行第一方面至第五方面或其任一实现方式中的方法。
第十五方面，提供了一种计算机可读存储介质，所述计算机可读存储介质存储有程序指令，所述程序指令使得通信装置(例如，终端设备或网络设备)得以执行第一方面至第五方面或其任一实现方式中的方法。
附图说明
图1为本地网络系统架构的示意图。
图2为5G系统的网络架构的示意图。
图3为本申请实施例提供的一种会话处理方法的示意性流程图。
图4为本申请实施例提供的另一种会话处理方法的示意性流程图。
图5为本申请实施例提供的又一种会话处理方法的示意性流程图。
图6为本申请实施例提供的又一种会话处理方法的示意性流程图。
图7为本申请实施例提供的又一种会话处理方法的示意性流程图。
图8为本申请实施例提供的又一种会话处理方法的示意性流程图。
图9为本申请实施例提供的又一种会话处理方法的示意性流程图。
图10为本申请实施例提供的又一种会话处理方法的示意性流程图。
图11为本申请一个实施例提供的通信装置的示意性结构图。
图12为本申请另一实施例提供的通信装置的示意性结构图。
图13为本申请又一实施例提供的通信装置的示意性结构图。
图14为本申请又一实施例提供的通信装置的示意性结构图。
图15为本申请又一实施例提供的通信装置的示意性结构图。
图16为本申请又一实施例提供的通信装置的示意性结构图。
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。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通信(global system for mobile communications，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、未来的第五代(5th generation，5G)系统或新无线(new radio，NR)等。上述多种系统中均可以包括会话管理网元和接入与移动管理网元，在不同的系统中具有会话管理功能的网元和接入与移动管理功能的网元可能对应不同的名称，例如在5G系统中会话管理网元可以称为SMF，接入与移动管理网元可以称为AMF。
本申请实施例中的终端装置，可以为用户设备(user equipment，UE)、终端设备、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。终端设备还可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端设备等，终端装置或用户设备也为一种芯片，本申请实施例对此并不限定。
本申请实施例提供的技术方案可以适用于针对LADN的会话处理场景。当用户设备在进入LADN的服务区域时，会通过建立会话以访问LADN的服务，该会话可以为LADN会话，LADN会话用于UE在LADN服务区域内进行数据传输的会话。锚点SMF(anchor-SMF，A-SMF)可以管理LAND中会话的建立、释放或者去激活等业务。当前 网络系统中的锚点SMF无法通过自身感知UE的位置信息，需要向接入与移动管理网元(access and mobility management function，AMF)订阅UE的位置信息。AMF可以检测UE是否处于LADN的服务区域内，并向锚点SMF发送UE是否处于LADN服务区域内的指示信息，例如，当AMF检测到UE移出当前LADN的服务区域时，该AMF可以向锚点SMF发送UE在LADN的服务区域之外或移除LADN的服务区域的指示信息，该指示信息例如可以是在UE presence in LADN的通知消息中指示为“OUT”等，从而使锚点SMF获知UE移出当前LADN的服务区域，进而进行释放或者去激活会话，以使该UE无法继续访问LADN提供的服务。
当UE发生移动，且移出锚点SMF的服务区域移出时，可能会发生AMF的切换，也即需要由源AMF切换至目标AMF，其中，源AMF为UE在移动之前的AMF，目标AMF为UE移动后切换至的新的AMF。源AMF上配置了LADN的信息，而目标AMF上可能未配置LADN的相关信息，该相关信息例如可以是LADN对应的网络名称、LADN的服务区域信息等。因此，目标AMF不会向锚点SMF发送UE是否移出LADN的服务区域的指示信息。此外，由于UE在移动中位置发生变化，UE可能无法通过RAN直接接入锚点SMF控制的锚点UPF(anchor-UPF，A-UPF)，此时，需要引入中间SMF(intermediate-SMF，I-SMF)，该中间SMF可以选择插入中间UPF(intermediate-UPF，I-UPF)连接RAN和锚点UPF。应理解，当网络系统中涉及两个SMF(锚点SMF和中间SMF)时，锚点SMF可以配置哪些DNN对应为LADN的信息，并且可以处理LAND会话的相关操作，例如LADN会话的建立、释放或者去激活等；而目前网络系统中的中间SMF上一般不会配置哪些DNN对应为LADN的相关信息。因此，当存在中间SMF时，处理LADN会话可能会存在问题，例如，当UE发生移动后切换至新的AMF上时，由于该新的AMF上未配置LADN的相关信息，故该AMF并不会向中间SMF发送UE移出LADN的指示消息，此时由于中间SMF上未配置哪些DNN为LAND，因此其无法获知当前会话为LADN会话，并且不会向锚点SMF发送UE移出LADN的通知消息，使得锚点SMF不能感知UE移出LADN的服务区域，进而不会触发去激活或者释放会话的操作，这就使得UE在移出LADN服务区域后仍然接入LADN，违背了LADN网络服务的访问原则。
图1示出了本申请实施例涉及到的本地区域网络架构的示意图。
LADN是指覆盖特定局部区域的网络。UE通过RAN访问本地UPF，从而实现对LADN的直接访问，该本地UPF例如可以是园区企业网中的UPF或者靠近LADN的UPF。UE对LADN网络的直接访问可以减少访问应用的时延，同时降低占用骨干网络的传输带宽。LADN的应用例如可以是：体育馆提供现场虚拟现实(virtual reality，VR)直播、校园内提供园内通信以使UE访问校园内学习资源、企业园区提供工业控制通信、商场提供本地购物优惠推送和实时位置导航等。
LADN信息可以包括LADN名称以及对应的服务区域的信息等，该ALDN信息可以配置在AMF上。其中，AMF可以仅配置处于其服务区域的LADN信息，例如，北京的AMF不会配置位于深圳的LADN信息。AMF可以根据LADN的服务区域以及UE的位置检测UE是否处于该LADN的服务区域内。当UE移出当前LADN的服务区域时，AMF向A-SMF发送UE移出LADN服务区域的指示信息，A-SMF进而释放或者去激活UE建立的LADN会话，也即不再允许UE访问LADN的服务。
图2是本申请实施例应用的5G系统网络架构的示意图。
在该5G系统中，UE可以基于Xn接口进行RAN切换，其中Xn接口为源接入网(source-RAN，S-RAN)与目标接入网(target-RAN，T-RAN)之间的接口。本申请实施例提供的会话处理方法涉及的5G系统中的网元包括RAN、源AMF(source-AMF，S-AMF)、目标AMF(target-AMF，A-AMF)、I-SMF、A-SMF以及UPF等。为方便理解，下面对本申请实施例涉及到的5G系统中的部分网元进行简单介绍。
RAN：接入网，在本申请实施例中，接入网可以包括源网络中的接入网S-RAN以及目标网络中的接入网络T-RAN。
AMF：接入与移动管理功能网元，主要通过N1接入UE的非接入层(non-access stratum，NAS)信令以及通过N2接入RAN信令，其中，NAS信令例如可以包括会话管理(session management，SM)信令。AMF可以用于UE的注册流程和SM信令的转发以及移动性管理。
SMF：会话管理功能网元，如上文所述，本申请实施例中的SMF包括I-SMF和A-SMF。A-SMF是服务会话的SMF，该A-SMF具有策略和计费控制(policy and charging control，PCC)接口和统一数据管理(unified data management，UDM)接口，可以用于执行UE网际协议(internet protocol，IP)地址分配等。I-SMF可以用于对无法接收A-SMF控制的中间用户面网元I-UPF进行控制，I-UPF可以是处于RAN与会话锚点A-UPF之间的中间UPF。I-SMF可以根据需要插入、切换或者移除。例如，当UE移出A-SMF的服务区域后，UE所附着的RAN可能无法直接连接A-SMF控制的A-UPF，此时，可以插入新的I-SMF，该I-SMF选择并插入I-UPF，使UE通过RAN先接入I-UPF，进而通过I-UPF连接到A-UPF。
UPF：用户面功能网元，主要用于数据包的转发、服务质量(quality of service，QoS)流映射等。
本申请实施例可以适用于UE从LADN的服务区域移出的过程中。下面结合图3，对本申请实施例涉及的会话处理方法进行介绍。
图3示出了本申请实施例提供的一种会话处理方法的示意性流程图。
为方便理解，首先对本实施例应用的场景进行简单的介绍。
本实施例适用于UE的移动的过程。具体地，UE在LADN的服务区域内建立了LADN会话，但后续该LADN会话变为去激活状态的情形，接着UE移出LADN的服务区域。在前述所说的情形下，UE在LADN的服务区域之外发起服务请求，请求激活该LADN会话。在本实施例中，通过限定LADN会话不允许插入中间SMF和中间UPF来继续访问LADN的服务，来简化LADN会话在移动流程中的处理。比如，在一种实现方式中，可以假定LADN的服务区域为锚点SMF服务区域的一个子集，也即LADN的服务区域包含于锚点SMF的服务区域，当UE移出锚点SMF的服务区域时，UE必然也会同时移出LADN的服务区域。应理解，在本实施例中，AMF可能发生了切换也可能未发生切换。图1实施例的具体流程如下。
S301，UE向RAN发起服务请求。
可选地，UE向RAN发起服务请求流程，具体地，UE可以向RAN发送注册请求信息，该注册请求信息中包括待激活的会话标识，具体地，可以包括待激活会话标识列表，其中，该会话标识对应的DNN可以为LADN DNN，也可以为非LADN DNN有多种，本实施例仅针对该会话标识对应的DNN为LADN DNN进行介绍。
应理解，会话标识或会话对应的DNN为LADN DNN，或者，会话标识或会话对应的DNN为LADN，或者，对应的会话为LADN会话，或者，会话对应为LADN，或者，会话标识或会话对应的DNN为LADN，以上表述具有相同的含义，用于表示所述会话为LADN会话适用于本申请文件的所有位置，这里做统一说明，后续不再赘述。
S302，RAN向AMF发送服务请求消息。
可选地，RAN向AMF发送的服务请求消息中包括的会话标识对应的DNN为LADN。
可选地，该服务请求消息用于请求激活当前会话；在一种实施方式中，该请求信息可以用于请求会话管理(session management，SM)上下文。
S303，AMF选择中间SMF。
应理解，当UE移出了锚点SMF的服务区域后，AMF选择插入一个中间SMF，该中间SMF可以选择一个中间UPF与锚点UPF连接。其中，AMF选择中间SMF的过程可以参见现有流程，此处不再赘述。
可选地，该AMF可以是未发生切换的源AMF，也可以是发生AMF切换流程后的目标AMF。
S304，AMF向中间SMF发送请求消息。
AMF向中间SMF发送请求消息，该请求消息用于请求创建会话上下文，该请求消息中包括会话标识。其中，所述会话标识可以为PDU会话ID，或者其它在中间SMF中能唯一确定该会话的标识，比如URI(Uniform Resource Identifier)，SM context ID等，本申请不做限定。
应理解，在AMF未发生切换时，该AMF上配置了LADN的信息，AMF可以根据配置的该LADN信息(包括LADN DNN以及对应的服务区域等)以及UE位置信息判断UE是否移出了LADN的服务区域。此时，在AMF向中间SMF发送的会话创建请求消息中可以包含指示UE处于LADN的服务区域之外的指示信息，也即第二指示信息。
可选地，在AMF发生切换时，该AMF为切换后的新的AMF，此时，该AMF上可能未配置LADN信息。在AMF向中间SMF发送的会话创建请求中可能不会包含UE处于LADN的服务区域之外的指示信息。
S305，中间SMF向锚点SMF发送请求消息。
可选地，中间SMF向锚点SMF发送的请求消息为会话上下文请求消息，也即该请求消息用于向锚点SMF请求会话ID所对应的会话的会话上下文。
可选地，中间SMF向锚点SMF发送的会话上下文请求消息可以包括第二指示信息，该第二指示信息用于指示UE处于LADN的服务区域之外。
可选地，该会话上下文请求消息中还可以包括激活会话的请求指示信息。
S306，锚点SMF向中间SMF发送回复消息，该回复消息可以为会话上下文回复消息。
作为一个示例，所述中间SMF接收锚点SMF的会话上下文回复消息。消息中包含会话上下文，所述中间SMF根据会话上下文确定所述会话为LADN会话，中间SMF拒绝所述会话标识对应的会话。例如，锚点SMF向中间SMF发送的会话上下文包括第一指示信息，该第一指示信息用于指示当前会话对应的DNN为LADN。
作为另一个示例，所述中间SMF接收锚点SMF的会话上下文回复消息。可选地，该会话上下文回复消息中包含原因信息，中间SMF拒绝所述会话标识对应的会话。可选地，锚点SMF收到中间SMF的会话上下文请求消息后，若锚点SMF确定当前会话为LADN 会话，锚点SMF拒绝向中间SMF发送会话上下文，在会话上下文回复消息中包含原因信息。原因信息可以为LADN会话拒绝插入I-SMF。
S307，中间SMF拒绝会话标识对应的会话。
所述中间SMF拒绝会话标识对应的会话可以有多种，包括：中间SMF拒绝激活会话标识对应的会话，或者，中间SMF拒绝激活会话标识对应的会话的用户面，或者，中间SMF决定释放会话标识对应的会话；应理解，在切换场景中，中间SMF拒绝切换会话标识对应的会话，或者，中间SMF拒绝激活会话标识对应的会话的用户面，或者，中间SMF决定释放会话标识对应的会话。其中，所述用户面包括RAN和UPF之间的传输路径，和/或，UE和RAN之间的无线连接。
作为一个示例，所述中间SMF接收锚点SMF的会话上下文回复消息中包含会话上下文，会话上下文可以包括第一指示信息，该第一指示信息用于指示当前会话对应的DNN为LADN，中间SMF拒绝所述会话标识对应的会话。
作为另一个示例，所述中间SMF接收锚点SMF的会话上下文回复消息中包含原因信息，中间SMF拒绝所述会话标识对应的会话。
可选地，当中间SMF确定会话ID对应的会话为LADN会话，也即当前会话为LADN会话时，该中间SMF拒绝会话ID对应的会话。
其中，中间SMF确定当前会话为LADN会话的方式：锚点SMF向中间SMF发送的会话上下文中包括第一指示信息，该第一指示信息用于指示当前会话对应的DNN为LADN；或者，中间SMF根据配置信息确定该会话为LADN会话，配置信息例如可以是存储在中间SMF上的信息；或者，中间SMF还可以根据AMF发送的第二指示信息确定会话为LADN会话，其中，第二指示信息用于指示UE处于LADN的服务区域之外。中间SMF确定会话为LADN会话方式可以有多种，本实施例不做限定。
可选地，中间SMF根据锚点SMF发送的第一指示信息确定当前会话为LADN会话后，拒绝会话标识对应的会话，终止激活该会话或终止激活该会话的用户面。其中，会话的用户面为数据传输路径。
S308，中间SMF向AMF发送第一消息。
可选地，该第一消息可以是会话上下文回复消息。
可选地，第一消息包括拒绝对应会话的原因信息。
中间SMF向AMF发送原因信息以通知AMF拒绝激活当前会话，也即LADN会话，或者，中间SMF向AMF发送原因信息以通知AMF拒绝激活当前会话的用户面。
可选地，原因信息用于指示会话激活失败的原因。例如，该原因可以是LADN会话拒绝插入中间SMF和中间UPF。
此外，应理解，图3所示的实施例还可以包括第二种实现方式。第二种实现方式中由锚点SMF来确定当前会话为LADN会话，拒绝会话标识对应的会话。
在第二种实现方式中，包括步骤S301至步骤S303和步骤S309至步骤S313，其中，步骤S301至步骤S303的具体描述见上文，此处不再赘述。
S309，AMF向中间SMF发送创建会话上下文请求消息。
S310，中间SMF向锚点SMF发送请求消息。
中间SMF向锚点SMF发送会话更新请求消息或者会话创建请求消息，该会话更新请求消息或者会话创建更新消息包括会话标识。或者，中间SMF向锚点SMF发送上下文请 求消息，该过程与步骤S305类似，可参见S305的描述。.
可选地，锚点SMF接收中间SMF发送的会话更新请求消息或者会话创建请求消息，确定该请求消息用于请求插入中间SMF。
作为一种示例，锚点SMF收到新的中间SMF发送的会话创建或会话更新请求，确定该请求消息用于插入中间SMF。
S311，锚点SMF拒绝会话标识对应的会话。
锚点SMF收到中间的SMF的请求消息后，锚点SMF确定会话标识对应的会话为LADN会话时，锚点SMF拒绝该会话。所述拒绝该会话具体可以为：锚点SMF拒绝激活会话标识对应的会话，或者，锚点SMF拒绝激活会话标识对应的会话的用户面，或者，后续锚点SMF释放会话标识对应的会话，或者，锚点SMF确定去激活(de-activate)所述会话标识对应的会话。其中，锚点SMF可以根据会话上下文确定当前会话为LADN会话，例如，会话上下文包括第一指示信息，该第一指示信息用于指示当前会话对应的DNN为LADN。或者，锚点SMF可以根据自身配置的信息确定LADN会话，例如，配置信息可以为锚点SMF存储哪些DNN为LADN等。
可选地，若步骤S310中该请求消息为上下文请求消息，当会话标识对应的会话为LADN会话时，锚点SMF拒绝向中间SMF发送会话上下文，并在会话上下文回复消息中包含原因信息，原因指示信息可以为LADN会话拒绝插入中间SMF和用户面网元UPF。
应注意，若图4对应的描述引用图3的描述时，会话激活的描述应对应理解成会话切换的描述。
可选地，锚点SMF确定LADN会话的方式可以有多种，具体地，锚点SMF可以根据自身配置的信息确定LADN会话；或者，锚点SMF根据会话上下文确定当前会话为LADN会话，例如，根据会话上下文中的用于指示当前会话对应的DNN为LADN的第一指示信息确定当前会话为LADN会话。其中，配置信息可以为锚点SMF存储的LADN的信息，例如哪些DNN为LADN等。
S312，锚点SMF向中间SMF发送第二消息。
可选地，该第二消息可以是创建会话上下文回复消息。
第二消息中包含指示信息或原因信息，所述指示信息或原因信息用于指示会话激活失败，或者，用于指示中间SMF不激活该会话的用户面，即，中间SMF根据该指示信息确定拒绝激活该会话的用户面。其中，所述用户面包括RAN和UPF之间的传输路径，和/或，UE和RAN之间的无线连接。应注意，在实施例图4中，所述指示信息应对应理解成用于指示会话切换失败。
应理解，该指示信息可以针对不同的场景指示相应的信息，例如，在服务请求的场景下，也即请求激活会话的场景，该指示信息用于指示会话激活失败或者中间SMF不激活该会话的用户面；在切换场景下时，该指示信息用于指示会话切换失败。
可选地，该第二消息还包括拒绝当前LADN会话的原因信息，该原因例如可以是LADN会话拒绝插入中间SMF和中间UPF。
可选地，锚点SMF向中间SMF发送的第二消息用于指示锚点SMF拒绝激活会话标识对应的会话，也即LADN会话。换句话说，锚点SMF向中间SMF发送拒绝消息以通知中间SMF当前会话激活失败或者终止激活。
可选地，锚点SMF向中间SMF发送的第二消息中携带用于指示拒绝激活会话的原因 信息或者用于指示会话激活失败的激活失败原因信息。该原因信息例如可以是LADN会话拒绝插入中间SMF和中间UPF。
S313，中间SMF向AMF发送第二消息中的指示信息。
可选地，中间SMF向AMF发送第二消息中的所述原因信息。
图4示出了本申请实施例提供的另一种会话处理方法的示意性流程图。
为方便理解，首先对本实施例应用的场景进行简单的介绍。
本实施例适用于UE的移动的过程。具体地，UE在LADN的服务区域内建立了LADN会话，当UE移出锚点SMF的服务区域时，发起切换流程(适用于Xn切换和N2切换)，请求切换该LADN会话。此时，AMF可能发生了切换，也可能未发生切换。本实施例中，限定不允许通过插入中间SMF和中间UPF来继续访问LADN服务。比如，在一种实现方式中，可以假定LADN的服务区域为锚点SMF服务区域的一个子集，也即LADN的服务区域包含于锚点SMF的服务区域，当UE移出锚点SMF的服务区域时，UE必然也会同时移出LADN的服务区域。本实施例与图3中的实施例的区别在于：若在切换过程中切换失败，则可能需要增加额外的处理，例如，释放或者去激活该LADN会话。
本申请的步骤S401至步骤S408与图3中的步骤S301至步骤S308类似，相关描述可以参见上文，为避免重复，此处不再赘述。应注意：图3中的步骤相关描述的会话激活在实施例中应对应理解成会话切换。
本实施例中，当中间SMF为执行主体时，即由中间SMF来确定拒绝切换会话时，其对应的流程还包括以下步骤：
当中间SMF拒绝会话标识对应的会话后，中间SMF向AMF发送第二消息，该第二消息包括拒绝当前LADN会话的原因信息。其中，中间SMF拒绝会话标识对应的会话为拒绝该会话标识对应的会话切换，该原因信息用于指示中间SMF拒绝切换该会话标识对应的会话的原因。
当AMF接收到第二消息后，还包括以下步骤：
S409，AMF向RAN发送切换命令。
可选地，AMF向RAN发送的切换命令中包括切换失败指示信息，该切换失败指示信息可以用于指示当会话标识对应的会话为LADN会话时，会话切换失败或者未被接受或者切换流程终止等。
可选地，该切换命令还可以包括失败原因信息。该失败原因信息例如可以是LADN会话拒绝插入中间SMF和中间UPF。
S410，AMF向锚点SMF发送会话释放请求消息。
可选地，锚点AMF接收AMF发送的会话释放请求消息后，对LADN会话进行去激活或者释放。应理解，锚点SMF对LADN会话的释放或者去激活过程可以参见现有技术，此处不再赘述。
此外，当本申请实施例的执行主体为锚点SMF时，即由锚点SMF来确定拒绝会话时，还包括步骤S411至步骤S417，其中步骤S411至步骤S415与图3的步骤S309至步骤S313类似，具体描述可以参见上文，为避免重复，此处不再赘述。
应理解，在本实施例的会话切换流程中，锚点SMF拒绝会话为该锚点SMF拒绝切换会话标识对应的会话。当执行主体为锚点SMF时还包括以下步骤：
S416，AMF向RAN发送切换命令。
可选地，AMF向RAN发送的切换命令中包括失败指示信息，该失败指示信息可以用于指示会话切换失败或者未被接受或者切换流程终止等。
可选地，该切换命令还可以包括失败原因信息。该失败原因信息例如可以是LADN会话拒绝插入中间SMF和中间UPF。
S417，AMF向锚点SMF发送会话释放请求消息。
可选地，锚点AMF接收AMF发送的会话释放请求消息后，对LADN会话进行去激活或者释放。应理解，锚点SMF对LADN会话的释放或者去激活过程可以参见现有技术，此处不再赘述。
图5示出了本申请实施例中的一种会话处理方法的示意性流程图。
该会话处理方法适用于UE移动而引发的切换流程中，例如，UE移出LADN的服务区域或者UE移出锚点SMF的服务区域的过程。包括步骤S510，步骤S520和步骤530。
S510，第一中间SMF接收第一指示信息。所述第一指示信息用于指示当前的会话对应的DNN为LADN或者用于指示当前会话为LADN会话。
可选地，在插入中间SMF的场景下，第一中间SMF为插入的目标中间SMF，也即UE移动前的LADN会话中没有中间SMF，UE发生移动后，尤其移出锚点SMF的服务区域后，需要插入中间SMF，该中间SMF即为目标中间SMF。
可选地，在中间SMF需要切换的场景下，即由源中间SMF切换至目标中间SMF时，第一中间SMF为切换后的目标中间SMF。其中，源中间SMF可以为发生中间SMF切换流程前的中间SMF；目标中间SMF可以是中间SMF切换流程后的中间SMF，也即新的中间SMF，应理解，该目标中间SMF上可能未配置LADN信息。
应理解，第一中间SMF可以根据需要插入、切换或者移除。
可选地，第一中间SMF接收到的第一指示信息可以由不同网元发送，例如，发送该第一指示信息的网元可以是源AMF、目标AMF、锚点SMF或者源中间SMF。其中，在AMF发生切换的场景下，源AMF为UE未发生AMF切换前的AMF，也即旧的AMF，该源AMF上配置了LADN信息；目标AMF为UE发生AMF切换后的AMF，也即新的AMF，该目标AMF上可能未配置LADN信息，其中LADN信息例如可以是LADN的服务区域或者与LADN相关的其他信息。针对由不同网元发送第一指示信息的具体实现方式，将在下文进行详细描述。
S520，第一中间SMF拒绝当前会话。
作为一个示例，若第一中间SMF接收了第一指示信息，且第一中间SMF从目标AMF接收的消息不包括用于指示UE是否在LADN的服务区域之内的指示信息，例如，不包括或UE presence in LADN指示信息，第一中间SMF确定UE在LADN的服务区域之外。
可选地，当第一中间SMF确定UE在LADN服务区域之外时，第一中间SMF可以直接拒绝会话，也即，第一中间SMF释放或者去激活该LADN会话。此外，第一SMF可以向AMF发送消息，消息中携带原因信息。
S530，可选地，第一中间SMF向锚点SMF发送第二指示信息。
应注意，若由第一中间SMF去激活该LADN会话，可以不向锚点SMF发送第二指示信息。
可选地，若第一中间SMF确定UE移出LADN的服务区域，向锚点SMF发送用于指示UE处于LADN的服务区域之外的第二指示信息。
具体而言，当目标AMF上未配置LADN的信息时，不会向第一中间SMF发送UE是否在LADN的服务区域之内的指示信息，由于第一中间SMF根据第一指示信息获知道了当前会话为LADN会话，因而可以确定UE移出LADN的服务区域，并向锚点SMF发送第二指示信息。
可选地，当第二消息中包括UE处于LADN的服务区域之外的指示信息时，第一中间SMF向锚点SMF转发该指示信息。具体而言，当目标AMF上配置了LADN信息时，目标AMF可以根据LADN的服务区域和UE的位置判断UE移出LADN的服务区域，并向第一中间SMF发送用于指示UE移出LADN的服务区域的第二指示信息。
可选地，第二指示信息例如可以是UE presence in LADN指示为“IN”或者“OUT”，当指示为“OUT”时，表明UE处于LADN的服务区域之外；当指示为“IN”时，表明UE在LADN的服务区域之内。
应理解，锚点SMF根据第二指示信息获知UE移出LADN的服务区域，进而可以释放或者去激活该UE建立的LADN会话。具体地，锚点SMF可以向目标AMF发送用于去激活LADN会话的消息，或者锚点SMF向A-UPF发送用于指示释放LADN会话的N3隧道信息的消息。
图6为本申请实施例的一种会话处理方法的示意性流程图。
为便于理解，首先对图6的场景以及涉及到各个的网元进行简单介绍。
本实施例适用于AMF发生切换，且中间SMF不变的场景。在发生AMF切换之前，源AMF管理UE的接入与移动业务，且UE附着的RAN通过第一中间SMF控制的中间UPF与锚点SMF控制的锚点UPF连接；当UE发生AMF切换后，源AMF检测到不能再服务UE，选择目标AMF作为新的AMF来服务UE，也即AMF发生切换，此时，第一中间SMF并未发生切换，也即UE附着的RAN仍通过第一中间SMF控制的中间UPF与锚点SMF控制的锚点UPF连接。本实施例的具体的实现流程如图6所示，各个步骤的描述如下：
S601，源RAN向目标RAN发送切换请求信息。
示例性的，当UE距离源RAN越来越远，且距离目标RAN越来越近时，UE可以从目标RAN获得更好的信号，因此，源RAN选择目标RAN，并向目标RAN发送切换请求消息。
可选地，切换请求信息用于向目标RAN请求UE切换至目标RAN。其中，该切换请求消息中可以携带要切换的LADN会话信息，例如，LADN会话对应的会话标识或者多个LADN会话对应的会话标识列表等。应理解，该切换请求消息中还可以包括非ALDN会话对应的会话标识，但不在本申请实施例的涉及范围之中，因此不作特别说明。本实施例对LADN会话的数量并不限定。
S602，源AMF向目标AMF发送创建UE上下文的请求消息。
可选地，当检测到源AMF无法再服务UE时，该源AMF选择目标AMF作为新的AMF来服务UE。其中，对目标AMF的选择流程可以参见现有流程，此处不再赘述。
可选地，源AMF向目标AMF发送的创建UE上下文的请求消息用于向目标AMF请求创建UE的上下文。创建UE上下文的请求消息中可以携带源AMF上存储的UE上下文信息，该UE上下文信息例如可以包括：LADN会话标识对应的DNN、SMF等。
S603，目标AMF向第一中间SMF发送会话创建/更新请求消息。
可选地，在UE的切换流程中，第一中间SMF并未发生切换。该第一中间SMF上配置了LADN的信息。该LADN信息例如可以是当前会话对应的DNN为LADN或者当前会话为LADN会话。
可选地，会话创建/更新请求消息中包括第一AMF标识。
可选地，第一中间SMF向目标AMF发送针对会话创建请求消息或者更新请求消息的回复消息。其中，当S-RAN与T-RAN之间有Xn接口时，第一中间SMF向目标AMF发送的回复消息中还可以包括直接转发指示，指示直接由源RAN向目标RAN转发数据；或者，该回复消息还可以是第一中间SMF选择并插入的I-UPF的上行隧道信息，例如I-UPF的IP地址或者隧道端点等。
值得注意的是，下述步骤(S604至步骤S612)均针对单个会话标识的情形进行描述，对于切换请求消息中包含多个会话标识的情况，可以理解为对每个会话标识对应的会话都执行一遍S604至步骤S612。
S604，目标AMF向目标RAN发送切换请求消息。
可选地，目标AMF在接收到第一中间SMF发送的I-UPF的上行隧道信息后，向目标RAN发送切换请求消息，该请求消息用于向目标RAN请求使UE接入目标RAN。
可选地，该切换请求消息中可以携带I-UPF的上行隧道信息。
可选地，当第一会话对应的I-UPF有多个时，切换请求消息中携带该多个I-UPF的上行隧道信息。
S605，目标RAN向目标AMF发送切换请求确认消息。
示例性的，目标RAN接收到目标AMF发送的切换请求消息后，在目标RAN上创建对应的资源，并向目标AMF发送切换请求确认消息。
可选地，目标RAN创建的资源可以包括N3隧道下行资源，该N3隧道下行资源例如可以是目标RAN的IP地址或者该N3隧道端点号等。
可选地，目标RAN向目标AMF发送的切换请求确认消息中包括目标RAN创建的N3隧道下行资源。
S606，目标AMF向源AMF发送创建上下文响应消息。
示例性的，当目标RAN以及目标AMF上的资源创建完毕后，目标AMF向源AMF发送创建上下文响应消息，该创建上下文响应消息用于目标AMF向源AMF指示目标RAN和目标AMF上的资源已经创建完毕。
可选地，目标AMF向源AMF发送的创建上下文响应消息还可以用于请求LADN中的源RAN执行将UE从源RAN切换至目标RAN的操作。
S607，UE由源RAN切换至目标RAN。
UE由源RAN切换至目标RAN的具体流程可以参见现有流程，此处不再赘述。
S608，目标RAN向目标AMF发送切换通知消息。
示例性的，目标RAN在UE完成切换过程后向目标AMF发送切换通知消息，该切换通知消息用于向目标AMF指示UE已成功切换至目标RAN。
S609，目标AMF向第一中间SMF发送会话更新消息。
可选地，该会话创建请求消息或者会话更新请求消息为第三消息。
可选地，若目标AMF上未配置LADN的相关信息，则在向第一中间SMF发送的会话更新消息中不包括用于指示UE处于LADN的服务区域之外的指示信息。
S610，第一中间SMF确定UE处于LADN的服务区域之外。
应理解，第一中间SMF可以确定当前会话为LADN会话或者当前会话对应的DNN为LADN。具体来说，第一中间SMF获知当前会话为LADN会话或者当前会话对应的DNN为LADN的方式可以包括：源AMF向第一中间SMF通知LADN的信息；或者，在插入第一中间SMF时，第一中间SMF从锚点SMF获取会话上下文，该会话上下文包括指示当前会话对应的DNN为LADN或者当前会话为LADN会话的指示信息等。应理解，第一中间SMF获知LADN的信息还可以有其他多种方式，本实施例对此不做限定。
可选地，若第一中间SMF接收到目标AMF发送的第二消息不包括用于指示UE处于LADN的服务区域之外的指示信息时，由于第一中间SMF可以确定当前会话为LADN会话，则第一中间SMF确定UE不再LADN的服务区域之外。其中，该第二消息可以是会话更新消息。
可选地，当第一中间SMF确定UE处于LADN的服务区域之外时，第一中间SMF可以直接拒绝会话，也即第一中间SMF释放或者去激活该LADN会话，此时，本实施例可以跳过步骤S611和S612。此外，第一中间SMF可以向AMF发送通知消息，该消息中携带原因信息。
S611，第一中间SMF向锚点SMF发送第二指示信息。
可选地，当第一中间SMF未执行释放或者去激活会话时，可以由锚点SMF执行释放或者去激活会话的操作。
可选地，当第一中间SMF确定UE移出LADN后，向第二SMF发送第二指示信息，该第二指示信息用于指示UE移出LADN。该第二指示信息可以是UE presence in LADN为“OUT”指示。
S612，锚点SMF执行释放或者去激活第一会话的操作。
可选地，当第一中间SMF未执行释放或者去激活会话时，可以由锚点SMF执行释放或者去激活会话的操作。
示例性地，第二SMF根据第二指示信息获知UE移出LADN，进而可以释放或者去激活该UE建立的LADN会话。具体地，SMF可以向AMF发送用于去激活LADN会话的消息，或者SMF向UPF发送用于指示释放LADN会话的N3隧道信息的消息。
其中，第二SMF执行的释放会话或者去激活会话的操作可以参见现有技术，此处不再赘述。
图7为本申请实施例的另一种会话处理方法的示意性流程图。
为便于理解，对本实施例可以应用的场景作简单介绍。
本实施例适用于AMF发生切换，且切换后的中间SMF为插入的新的中间SMF的场景。具体地，UE移动引发切换流程，其中AMF发生切换，源AMF(也即旧的AMF)上配置了LADN的信息，且UE在LADN的服务区域内建立的LADN会话，发生切换后，AMF切换为目标AMF(也即新的AMF)，该目标AMF上未配置LADN的信息。此外，在该切换流程中还包括以下两种具体场景：(1)切换前的LADN会话没有中间SMF(也即未涉及源中间SMF)，切换后，UE移出了锚点SMF的服务区域，因此需要插入第一中间SMF；(2)切换前的LADN会话有中间SMF(也即源中间SMF)，切换后，需要由源中间SMF切换至新的中间SMF上，也即切换至目标中间SMF上。本实施例的具体的实现流程如图7所示，各个步骤的描述如下：
图7中各个网元的交互过程如下：
步骤S701与图6中的步骤S601类似，具体的实现方法可以参见上文关于S601的描述，为避免重复，此处不再赘述。
S702，源AMF向目标AMF发送创建UE上下文请求消息。
可选地，检测到无法再服务UE时，选择目标AMF作为新的AMF来服务UE。其中，对第一AMF的选择流程可以参见现有流程，此处不再赘述。
可选地，创建UE上下文的请求消息用于向目标AMF请求创建UE的上下文，其中，该创建UE上下文的请求消息中还可以携带源AMF上存储的UE上下文信息，该UE上下文信息例如可以包括：PDU会话标识对应的DNN、SMF等。
可选地，当该会话为LADN会话时，增加第一指示信息，该第一指示信息用于指示当前会话的DNN为LADN或者当前会话为LADN会话。应理解，当目标AMF上未配置LADN的信息时，目标AMF可以根据第一指示信息获知当前会话为LADN会话。
可选地，目标AMF根据第一指示信息获知当前会话为LADN会话后，若该目标AMF上配置了LADN的服务区域的信息，则目标AMF可以根据UE的位置以及LADN的服务区域确定UE是否移出LADN的服务区域。
可选地，目标AMF根据第一指示信息获知当前会话为LADN会话后，若目标AMF未配置LADN的服务区域等信息时，该目标AMF可以确定UE处于LADN的服务区域之外。
步骤S703至步骤S708与图6中的步骤S603至S608类似，具体实现方法可以参见上文对相应步骤的描述，为避免重复，此处不再赘述。
下面针对图7的步骤S709至步骤S712进行说明。
S709，目标AMF向第一中间SMF发送会话更新消息，该会话更新消息包括用于指示UE位于LADN的服务区域之外的第二指示信息。
可选地，该会话创建请求消息或者会话更新请求消息为第三消息。
示例性的，若目标AMF在步骤S702确定UE位于LADN的服务区域之外，向第一中间SMF发送的第二消息包括第二指示信息，该第二指示信息用于向第一SMF指示UE位于LADN的服务区域之外。该第二指示信息例如可以是UE presence in LADN指示为“OUT”。
应理解，当切换前的LADN会话中有中间SMF，且UE在移动过程中，移出了源中间SMF的服务区域，则第一中间SMF为切换后的目标中间SMF。当切换前的LADN会话中没有中间SMF，UE在移动过程中移出锚点SMF的服务区域，此时的第一中间SMF为插入的目标中间SMF。
S710，第一中间SMF拒绝当前会话。
作为一个示例，第一中间SMF根据步骤S704和步骤S705获知当前会话为LADN会话或者当前会话对应的DNN为LADN，若在步骤S709中，第一中间SMF接收到目标AMF发送的消息中不包括用于指示UE处于LADN服务区域之外的指示信息，则第一中间SMF可以确定UE处于LADN的服务区域之外。
作为另一个示例，在步骤S702中，目标AMF根据第一指示信息获知当前会话为LADN会话后，若目标AMF未配置LADN的服务区域等信息，则目标AMF可以确定UE处于LADN的服务区域之外，若在步骤S709中，，第一中间SMF接收到目标AMF发送的消 息中包括用于指示UE处于LADN服务区域之外的指示信息，则第一中间SMF可以确定UE处于LADN的服务区域之外。
可选地，当第一中间SMF确定UE处于LADN的服务区域之外时，第一中间SMF可以直接拒绝当前会话，也即，第一中间SMF释放或者去激活该LADN会话，此时本实施例跳过步骤S711和S712。
步骤S711，第一中间SMF向锚点SMF转发第二指示信息。
可选地，当第一中间SMF未执行释放或者去激活会话时，可以由锚点SMF执行释放或者去激活会话的操作。
可选地，当第一中间SMF确定UE移出LADN后，向第二SMF发送第二指示信息，该第二指示信息用于指示UE移出LADN。该第二指示信息可以是UE presence in LADN为“OUT”指示。
S712，锚点SMF执行释放或者去激活第一会话的操作。
可选地，当第一中间SMF未执行释放或者去激活会话时，可以由锚点SMF执行释放或者去激活会话的操作。
示例性地，第二SMF根据第二指示信息获知UE移出LADN，进而可以释放或者去激活该UE建立的LADN会话。具体地，SMF可以向AMF发送用于去激活LADN会话的消息，或者SMF向UPF发送用于指示释放LADN会话的N3隧道信息的消息。
其中，第二SMF执行的释放会话或者去激活会话的操作可以参见现有技术，此处不再赘述。
本实施例通过源AMF向目标AMF发送LADN会话指示信息，使AMF可以获知当前会话为LADN会话，以进一步通过中间SMF向锚点SMF发送UE移出LADN的服务区域的指示信息，使得在有两个SMF的场景中可以实现中间SMF或者锚点SMF去激活或者释放当前会话，以节省LADN的服务资源。
图8为本申请实施例的又一种会话处理方法的示意性流程图。包括步骤S801至步骤S811。为便于理解，对本实施例可以应用的场景进行简单介绍。
本实施例可以适用于UE移动引发的切换流程中，其中，AMF发生切换，切换前的AMF为源AMF，且该源AMF上配置了LADN的信息，切换后的AMF为目标AMF，该目标AMF上未配置LADN的信息。发生切换前，UE在LADN的服务区域之内建立了LADN会话，且切换前该LADN会话有中间SMF(即源中间SMF)，切换后需要切换至新的中间SMF(即目标中间SMF)上。本实施例的具体的实现流程如图6所示，各个步骤的描述如下：
步骤S801至S803与图6中的步骤S601至S603类似，具体的实现方法可以参见上文关于S601至S603的描述，为避免重复，此处不再赘述。
S804，源中间SMF向目标中间SMF发送第一指示信息。
可选地，源中间SMF可以向目标SMF发送会话上下文，该会话上下文中包括第一指示信息，其中第一指示信息用于指示当前会话对应的DNN为LADN或者当前会话为LADN会话。换句话说，目标中间SMF可以根据源中间SMF获知当前会话为LADN会话。
可选地，源中间SMF获取当前会话为LADN会话或者获取第一指示信息的方式可以包括：在插入源中间SMF时，源中间SMF从锚点SMF获取会话上下文，该会话上下文 包括用于指示当前会话对应的DNN为LADN或者当前会话为LADN会话的指示信息；或者，在中间SMF切换的场景下，源中间SMF从切换前的中间SMF获取会话上下文，该会话上下文包括用于指示当前会话对应的DNN为LADN或者当前会话为LADN会话的指示信息；或者，在插入源中间SMF时，源AMF将当前会话对应的DNN为LADN或者当前会话为LADN会话指示信息通知给源中间SMF；或者，源中间SMF上可以预配置有LADN会话相关的信息。应理解，源中间SMF获取当前会话为LADN会话或者第一指示信息的方式还可以包括其他多种，本申请对此不做限定。
S805至S809与图6的S604至S608类似，具体的实现过程可以参见上文关于S604至S608的描述，为避免重复，此处不再赘述。
S810，目标AMF向第一中间SMF发送会话更新消息。
可选地，该会话创建请求消息或者会话更新请求消息为第三消息。
可选地，目标AMF上未配置与LADN相关的信息，因而在向目标中间SMF发送会话更新消息中不包括UE是否移出LADN的指示信息。
可选地，目标中间SMF根据步骤S604的第一指示信息获知当前会话为LADN会话，因此，当目标中间SMF未接收到目标AMF发送的UE是否移出LADN的指示信息时，该目标中间SMF可以判断UE已经移出了LADN的服务区域。
S811，第一中间SMF拒绝当前会话。
作为一个示例，第一中间SMF根据步骤804获知当前会话为LADN会话或者当前会话对应的DNN为LADN，若步骤S810中第一中间SMF接收到目标AMF发送的第二消息不包括用于指示UE不在LADN的服务区域之内的指示信息，第一中间SMF确定UE不在LADN的服务区域之内。
可选地，当第一中间SMF确定UE不在LADN服务区域之内时，第一中间SMF可以直接拒绝会话，第一中间SMF释放或者去激活该LADN会话，此时，本实施例跳过步骤S812和S813。此外，第一SMF可以向AMF发送消息，消息中携带原因信息，具体方法可参照实施例3和实施例4中所述。
步骤S812，第一中间SMF向锚点SMF转发第二指示信息。
可选地，当第一中间SMF未执行释放或者去激活会话时，可以由锚点SMF执行释放或者去激活会话的操作。
可选地，当第一中间SMF确定UE移出LADN后，向第二SMF发送第二指示信息，该第二指示信息用于指示UE移出LADN。该第二指示信息可以是UE presence in LADN为“OUT”指示。
S813，锚点SMF执行释放或者去激活第一会话的操作。
可选地，当第一中间SMF未执行释放或者去激活会话时，可以由锚点SMF执行释放或者去激活会话的操作。
示例性地，第二SMF根据第二指示信息获知UE移出LADN，进而可以释放或者去激活该UE建立的LADN会话。具体地，SMF可以向AMF发送用于去激活LADN会话的消息，或者SMF向UPF发送用于指示释放LADN会话的N3隧道信息的消息。
其中，第二SMF执行的释放会话或者去激活会话的操作可以参见现有技术，此处不再赘述。
图9示出了本申请实施例的又一种会话处理方法的示意性流程图。
为方便理解，首先对本实施例应用的场景进行简单的介绍。
本实施例适用于空闲态UE的移动过程。具体地，UE移出源AMF的服务区域后，重新发起重注册流程，其中，UE由源AMF切换至目标AMF上，该源AMF上配置了LADN的信息，而目标AMF上未配置LADN的信息。当UE由源AMF服务时，UE在LADN的服务区域之内建立了会话，该会话在UE变为空闲态时变为去激活状态，UE在发起重注册的注册请求中携带会话标识请求激活会话。UE移动后需要切换中间SMF或者插入中间SMF。
图9示出的会话处理方法包括步骤S901至S909。
S901，UE向目标RAN发送注册请求消息。
示例性的，空闲态UE移动到目标RAN后向请求接入的目标RAN发起注册请求。
可选地，UE发送的注册请求消息中携带待激活的会话标识以及对应的上下文，其中，会话标识对应的DNN可以是LADN或其他网络类型，本实施例仅针对会话标识对应的DNN为LADN时进行介绍。
S902，目标RAN选择目标AMF。
可选地，目标RAN在接收到UE发送的注册请求消息后，选择对UE进行服务的目标AMF。其中，T-RAN选择目标AMF的流程可以参见现有流程，此处不再赘述。
S903，目标RAN向目标AMF发送注册请求消息。
可选地，目标RAN将在步骤S702中接收到的注册请求消息转发给目标AMF。
可选地，该注册请求消息中可以包括待激活的会话标识等信息，该会话标识对应的DNN为LADN。
S904，目标AMF向源AMF发送上下文请求消息。
可选地，当目标AMF接收到的注册请求消息中包括待激活的会话标识的信息时，向源AMF请求获取UE会话的上下文信息。
S905，源AMF向目标AMF发送针对上下文请求消息的响应消息。
可选地，该响应消息包括第一指示信息，例如，LADN会话的会话标识对应的DNN为LADN或者某个会话为LADN会话。
S906，目标AMF选择第一中间SMF。
可选地，目标AMF可以根据接收到的第一指示信息获知LADN的信息。
可选地，当目标AMF自身没有配置LADN的信息时，该目标AMF确定UE移出LADN的服务区域。
可选地，在中间SMF需要切换的场景下，源中间SMF为切换前的中间SMF，目标中间SMF为切换后的中间SMF，此时，第一中间SMF也即切换后的目标中间SMF。
可选地，当UE切换流程之前的会话中没有中间SMF时，第一中间SMF即为插入的目标中间SMF。
应理解，目标AMF选择第一中间SMF的流程可以参见现有流程，此处不再赘述。
S907，目标AMF向第一中间SMF发送会话创建请求或者会话更新请求消息。
应理解，第一AMF选择插入第一中间SMF或者切换第一中间SMF后，向其发送对应的会话创建请求消息或者会话更新请求消息。
可选地，目标AMF可以根据步骤S905送接收的第一指示信息确定该会话为LADN会话。当目标AMF上未配置LADN的信息时，目标AMF可以确定UE移出了LADN的 服务区域。此时，目标AMF可以在会话创建/更新请求消息中包括第二指示信息，该第二指示信息用于指示UE处于LADN的服务区域之外。其中，第二指示信息例如可以是UE presence in LADN指示为“OUT”。
可选地，第二指示信息可以包括在目标AMF向第一中间SMF发送的会话更新请求消息或者会话创建请求消息中。具体地，在中间SMF发生切换的场景下，目标AMF向第一中间SMF发送会话更新请求消息；在中间SMF为新插入的场景下，目标AMF向第一中间SMF发送会话切换请求消息。
可选地，目标AMF向第一中间SMF发送的会话更新请求消息或者会话创建请求消息中例如可以携带UE presence in LADN指示为“OUT”的信息。
可选地，目标AMF还可以向第一中间SMF发送第一指示信息，以通知第一中间SMF当前会话标识对应的DNN为LADN或者当前会话为LADN会话。
S908，第一中间SMF向锚点SMF发送第二指示信息。
可选地，当第一中间SMF接收到目标AMF发送的第二指示信息后，将该第二指示信息转发给锚点SMF。其中，第二指示信息用于指示UE移出LADN的服务区域。
可选地，第一中间SMF向锚点SMF转发在步骤S707中接收到的会话更新请求消息或者会话创建请求消息，该会话更新请求消息或者会话创建请求消息中携带第二指示信息。例如，会话更新请求消息或者会话创建请求消息中携带UE present in LADN为“OUT”的指示信息。
S909，锚点SMF去激活或者释放会话。
可选地，锚点SMF根据第二指示信息确定UE移出LADN的服务区域后，触发去激活或者释放会话的操作。其中，锚点SMF去激活会话或者释放会话的过程可以参见现有流程，此处不再赘述。
图10示出了本申请实施例提供的又一种会话处理方法的示意性流程图。
为方便理解，首先对本实施例应用的场景进行简单的介绍。
本实施例适用于空闲态UE移动后发起服务请求的场景中。具体地，空闲态UE移动过程中，移出源AMF的服务区域，且UE发起服务请求流程，AMF由源AMF切换至目标AMF。其中，UE在由源AMF提供服务时，在LADN的服务区域内建立了会话，但该会话在UE变为空闲态时变为去激活状态。此外，源AMF上配置了LADN的信息，目标AMF上未配置LADN的信息。本实施例中UE移动后需要切换中间SMF或者插入中间SMF。
图10示出的会话处理方法包括步骤S1001至S1009。
应理解，AMF发生切换后，也即由原来为UE提供服务的源AMF切换至目标AMF。其中，目标AMF上可能未配置LADN的信息。
还应理解，当UE移动后，移出了锚点SMF的服务区域，目标AMF可以选择插入一个第一中间SMF，该第一中间SMF选择一个中间UPF与锚点UPF连接。或者，当UE移动后，移出了源中间SMF的服务区域，目标AMF可以重新选择一个中间SMF，该第一中间SMF选择一个中间UPF与锚点UPF连接。
S1001，UE向目标RAN发送服务请求消息。
示例性的，空闲态UE移动到目标RAN后向请求接入的目标RAN发起服务请求。
可选地，UE发送的服务请求消息中携带待激活的会话标识，其中，会话标识对应的 DNN可以是LADN或其他网络类型，本实施例仅针对会话标识对应的DNN为LADN时进行介绍。
S1002，目标AMF接收目标RAN发送的服务请求消息。
可选地，该服务请求消息可以包括UE是否位于LADN服务区域之外的指示信息和UE的位置信息。若目标AMF上没有配置该LADN的信息，则不包含该指示信息。值得注意的是，此步骤中可能还涉及了目标RAN与源RAN的交互，和/或，目标AMF和源AMF的交互，均为现有技术，不做赘述。
S1003，目标AMF选择第一中间SMF。
可选地，目标AMF检测UE移出了锚点SMF的服务区域，目标AMF选择并插入第一中间SMF，或者目标AMF检测UE移出了源中间SMF的服务范围，目标AMF选择第一中间SMF进行中间SMF切换，即从源中间SMF切换到第一中间SMF。
S1004，目标AMF向第一中间SMF发送创建会话请求消息。
可选地，该会话创建请求消息用于请求在第一中间SMF上建立会话上下文。
可选地，该创建会话请求消息包括UE是否位于LADN的服务区域之内的指示信息。
S1005，第一中间SMF请求获取会话上下文。
作为一个示例，对应步骤S1005a，目标AMF检测UE移出了锚点SMF的服务区域，则向锚点SMF请求获取会话上下文，会话上下文中包含信息指示当前会话对应的DNN为LADN或者当前会话为LADN会话
作为另一个示例，对应步骤S1005b，目标AMF检测UE移出了源中间SMF的服务区域，则向源中间SMF请求获取会话上下文，会话上下文中包含信息指示当前会话对应的DNN为LADN或者当前会话为LADN会话。
S1006，第一中间SMF确定UE不在LADN的服务区域之内。
作为一个示例，第一中间SMF根据步骤S1005获知当前会话为LADN会话或者当前会话对应的DNN为LADN，若步骤S1004中第一中间SMF接收到目标AMF发送的消息中不包括用于指示UE在LADN的服务区域之外的指示信息，第一中间SMF确定UE在LADN的服务区域之外。
可选地，当第一中间SMF确定UE不在LADN服务区域之内时，第一中间SMF可以直接拒绝会话，第一中间SMF释放或者去激活该LADN会话，此时，本实施例不涉及步骤S1007和S1008。此外，第一SMF还可以向AMF发送消息，消息中携带原因信息，具体方法可参照实施例3和实施例4中所述。
步骤S1007，第一中间SMF向锚点SMF转发第二指示信息。
可选地，当第一中间SMF未执行释放或者去激活会话时，可以由锚点SMF执行释放或者去激活会话的操作。
可选地，当第一中间SMF确定UE移出LADN后，向第二SMF发送第二指示信息，该第二指示信息用于指示UE移出LADN。该第二指示信息可以是UE presence in LADN为“OUT”指示。
S1008，锚点SMF执行释放或者去激活第一会话的操作。
可选地，当第一中间SMF未执行释放或者去激活会话时，可以由锚点SMF执行释放或者去激活会话的操作。其中，第二SMF执行的释放会话或者去激活会话的操作可以参见现有技术，此处不再赘述。
图11示出了本申请一个实施例提供的通信装置的结构性示意图。图11所示的通信装置1100可对应于图1实施例所描述的中间会话管理网元SMF。通信装置1100可包括：第一接收模块1101和第一处理模块1102。
可选地，第一接收模块1101可用于接收接入移动管理网元AMF发送的请求消息，所述请求消息包括会话标识。
可选地，第一处理模块1102可用于当会话标识对应的会话为LADN会话时，该第一处理模块拒绝该会话标识对应的会话。
可选地，通信装置1100还可以包括：第二处理模块，用于根据从锚点SMF获取的会话上下文确定会话为LADN会话，该会话上下文包括用于指示还会话为该LADN会话的第一指示信息。
可选地，通信装置1100还可以包括：第三处理模块，用于根据所述AMF发送的第二指示信息确定所述会话为LADN会话，所述第二指示信息用于指示UE移出LADN的服务区域。
可选地，通信装置1100还可以包括：第一发送模块，用于向所述AMF发送第一消息，所述第一消息包括原因信息。
可选地，所述原因信息包括所述LADN会话拒绝插入中间SMF和中间用户面网元UPF。
图12示出了本申请另一实施例提供的通信装置的结构性示意图。图12所示的通信装置1200可对应于图1中实施例所描述的AMF。通信装置1200可包括：第一发送模块1201和第一接收模块1202。
可选地，第一发送模块1201向中间SMF发送请求消息，所述请求消息包括会话标识，其中，所述中间SMF为UE移出锚点SMF的服务区域时所述AMF选择的SMF。
可选地，第一接收模块1202用于接收所述中间SMF发送的第一消息，所述第一消息包括原因信息。
可选地，通信装置1200还可以包括第二发送模块，用于向无线接入网RAN发送原因信息。
可选地，通信装置1200还可以包括第三发送模块，用于向锚点SMF发送会话释放请求消息，所述会话释放请求消息用于请求锚点SMF释放LADN会话。
图13示出了本申请又一实施例提供的通信装置的结构性示意图。图13所示的通信装置1300可对应于图1或图2所示方法中描述的锚点SMF。通信装置1300可包括：第一接收模块1301和第一处理模块1302。
可选地，第一接收模块1301用于接收中间SMF发送的请求消息，所述请求消息包括会话标识，其中，中间SMF为UE移出锚点SMF的服务区域时所述AMF选择的SMF。
可选地，第一处理模块1302用于当所述会话标识对应的会话为LADN会话时，第一处理模块1302拒绝所述会话标识对应的会话，其中，所述LADN会话为所述锚点SMF服务的会话。
可选地，通信装置1300还可以包括第二处理模块，用于根据会话上下文确定当前会话为LADN会话。
可选地，通信装置1300还可以包括第二处理模块，用于根据配置信息确定当前会话为LADN会话，所述配置信息包括所述当前会话对应的DNN为LADN。
可选地，通信装置1300还可以包括第二发送模块，用于向所述中间SMF发送第二消息，所述第二消息包括原因信息，所述原因信息用于指示所述会话激活失败。
可选地，所述第一处理模块拒绝所述会话标识对应的会话，包括：释放所述会话标识对应的会话；或者，去激活所述会话标识对应的会话；或者，拒绝激活或者切换所述会话标识对应的会话。
图14示出了本申请又一实施例提供的通信装置的结构性示意图。图13所示的通信装置1400可对应于前述描述的第一中间SMF。通信装置1400可包括：第一接收模块1401和第一发送模块1402。
可选地，第一接收模块1401用于接收第一指示信息，其中，第一指示信息用于指示当前会话对应的数据网络名称DNN为LADN。
可选地，第一发送模块1402用于向锚点SMF发送第二指示信息，其中，所述第二指示信息用于指示UE处于LADN的服务区域之外，所述锚点SMF为所述当前会话的锚点SMF。
可选地，通信装置1400还可以包括：第二接收模块，用于接收目标AMF发送的第三消息。
可选地，通信装置1400还可以包括：第一处理模块，用于当所述第三消息不包括所述UE处于所述LADN的服务区域之外的指示信息时，确定UE处于所述LADN的服务区域之外，所述目标AMF为所述UE切换到的AMF。
可选地，通信装置1400还可以包括：第二发送模块，用于当所述第二消息包括所述UE处于所述LANF的服务区域之外时，向锚点SMF发送所述第二指示信息。
可选地，所述第一指示信息由以下任一网元发送：源AMF、所述目标AMF、所述锚点SMF或者第二中间SMF，所述第二中间SMF用于控制与源基站接口的中间UPF。
图15示出了本申请又一实施例提供的通信装置的结构性示意图。图14所示的通信装置1500可对应于前述描述的目标AMF。通信装置1500可包括：第一接收模块1501和第一发送模块1502。
可选地，第一接收模块1501用于接收源AMF发送的第一指示信息，所述第一指示信息用于指示当前会话对应的DNN为LADN。
可选地，第一发送模块1502用于当所述目标AMF确定UE移出所述LADN的服务的区域时，向第一中间SMF发送第二指示信息，所述第二指示信息用于指示所述UE处于LADN的服务区域之外，所述第一中间SMF用于控制与目标基站接口的中间UPF。
可选地，通信装置1500还可以包括：第一处理模块，用于确定所述UE移出所述LADN的服务区域。
可选地，第一处理模块确定所述UE移出所述LADN的服务区域，包括：当所述目标AMF上未配置所述LADN的信息时，确定所述UE移出所述LADN的服务区域。
可选地，第一处理模块确定所述UE移出所述LADN的服务区域，包括：当所述目标AMF配置有所述LADN的信息时，根据所述LADN的信息以及所述UE的位置确定所述UE移出所述LADN的服务区域。
可选地，所述LADN的信息包括所述LAND的服务区域信息。
图16示出了本申请实施例提供的一种通信装置的示意性结构图。图16所示的通信装置1600可对应于前文描述的会话处理方法涉及的中间SMF或者锚点SMF或者AMF。通 信装置1600包括至少一个处理器1601和通信接口1602，所述通信接口1602可用于所述通信装置1600与其他通信装置进行信息交互，当程序指令在所述至少一个处理器1601中执行时，使得所述通信装置1600实现前文中的由中间SMF或者锚点SMF或者AMF执行的各个步骤或方法或操作或功能。
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。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
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(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、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 (60)

  1. 一种会话处理的方法，其特征在于，包括：
    中间会话管理网元SMF接收接入与移动管理网元AMF发送的请求消息，所述请求消息包括会话标识，其中，所述中间SMF为用户设备UE移出锚点SMF的服务区域时所述AMF所选择的SMF；
    当所述会话标识对应的会话为本地区域数据网络LADN会话时，所述中间SMF拒绝所述会话标识对应的会话。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述中间SMF根据所述锚点SMF发送的会话上下文确定所述会话为LADN会话，所述会话上下文包括用于指示所述会话为所述LADN会话的第一指示信息；或者，
    所述中间SMF根据所述AMF发送的第二指示信息确定所述会话为LADN会话，所述第二指示信息用于指示UE在LADN的服务区域之外。
  3. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    所述中间SMF向所述AMF发送第一消息，所述第一消息包括原因信息。
  4. 根据权利要求3所述的方法，其特征在于，所述原因信息包括：
    所述LADN会话拒绝插入中间SMF和中间用户面网元UPF。
  5. 根据权利要求1-4中任一项所述的方法，其特征在于，所述LADN会话对应的LADN的服务区域在所述锚点SMF的服务区域内。
  6. 一种会话处理的方法，其特征在于，包括：
    AMF向中间SMF发送请求消息，所述请求消息包括会话标识，其中，所述中间SMF为UE移出锚点SMF的服务区域时所述AMF选择的SMF；
    所述AMF接收所述中间SMF发送的第一消息，所述第一消息包括原因信息。
  7. 根据权利要求6所述的方法，其特征在于，所述原因信息包括：
    LADN会话拒绝插入中间SMF和中间UPF。
  8. 根据权利要求6或7所述的方法，其特征在于，所述方法还包括：
    所述AMF向无线接入网RAN发送原因信息。
  9. 根据权利要求6-8中任一项所述的方法，其特征在于，所述方法还包括：
    所述AMF向所述锚点SMF发送会话释放请求消息，所述会话释放请求消息用于请求所述锚点SMF释放LADN会话。
  10. 根据权利要求7-9任一项所述的方法，其特征在于，所述LADN会话对应的LADN的服务区域在所述锚点SMF的服务区域内。
  11. 一种会话处理的方法，其特征在于，包括：
    锚点SMF接收中间SMF发送的请求消息，所述请求消息包括会话标识，其中，所述中间SMF为UE移出所述锚点SMF的服务区域时AMF选择的SMF；
    当所述会话标识对应的会话为LADN会话时，所述锚点SMF拒绝所述会话标识对应的会话。
  12. 根据权利要求11所述的方法，其特征在于，所述请求消息用于请求插入中间SMF。
  13. 根据权利要求11或12所述的方法，其特征在于，所述方法还包括：
    所述锚点SMF根据会话上下文确定当前会话为LADN会话；或者，
    所述锚点SMF根据配置信息确定当前会话为LADN会话，所述配置信息包括所述当前会话对应的DNN为LADN。
  14. 根据权利要求11-13中任一项所述的方法，其特征在于，所述方法还包括：
    所述锚点SMF向所述中间SMF发送第二消息，所述第二消息包括原因信息，所述原因信息用于指示所述会话激活失败；或者，
    所述原因信息用于指示中间SMF拒绝激活所述会话。
  15. 根据权利要求11-14中任一项所述的方法，其特征在于，所述锚点SMF拒绝所述会话标识对应的会话，包括：
    所述锚点SMF释放所述会话标识对应的会话；或者，
    所述锚点SMF去激活所述会话标识对应的会话；或者，
    所述锚点SMF拒绝激活或者切换所述会话标识对应的会话。
  16. 根据权利要求11-15中任一项所述的方法，其特征在于，所述原因信息包括：
    所述LADN会话拒绝插入中间SMF和中间UPF。
  17. 根据权利要求11-16中任一项所述的方法，其特征在于，所述LADN会话对应的LADN的服务区域在所述锚点SMF的服务区域内。
  18. 一种会话处理的方法，其特征在于，包括：
    第一中间SMF接收第一指示信息，其中，第一指示信息用于指示当前会话对应的数据网络名称DNN为LADN，所述第一中间SMF用于控制与目标基站接口的中间UPF；
    所述第一中间SMF向锚点SMF发送第二指示信息，其中，所述第二指示信息用于指示UE处于LADN的服务区域之外，所述锚点SMF为服务所述当前会话的锚点SMF；
    所述锚点SMF根据所述第二指示信息释放所述当前会话。
  19. 根据权利要求18所述的方法，其特征在于，所述方法还包括：
    所述第一中间SMF接收目标AMF发送的第三消息；
    当所述第三消息不包括所述UE处于所述LADN的服务区域之外的指示信息时，所述第一中间SMF确定UE处于所述LADN的服务区域之外，所述目标AMF为所述UE切换到的AMF。
  20. 根据权利要求18所述的方法，其特征在于，所述方法还包括：
    所述第一中间SMF接收目标AMF发送的第三消息；
    当所述第三消息包括所述UE处于所述LANF的服务区域之外的指示信息时，所述第一中间SMF向锚点SMF发送所述第二指示信息。
  21. 一种会话处理的方法，其特征在于，包括：
    目标AMF接收源AMF发送的第一指示信息，所述第一指示信息用于指示当前会话对应的DNN为LADN；
    当所述目标AMF确定UE移出所述LADN的服务的区域时，所述目标AMF向第一中间SMF发送第二指示信息，所述第二指示信息用于指示所述UE处于LADN的服务区域之外，所述第一中间SMF用于控制与目标基站接口的中间UPF。
  22. 根据权利要求21所述的方法，其特征在于，所述目标AMF确定所述UE移出所述LADN的服务区域，包括：
    当所述目标AMF上未配置所述LADN的信息时，所述目标AMF确定所述UE移出 所述LADN的服务区域。
  23. 根据权利要求21所述的方法，其特征在于，所述目标AMF确定所述UE移出所述LADN的服务区域，包括：
    当所述目标AMF配置有所述LADN的信息时，所述目标AMF根据所述LADN的信息以及所述UE的位置确定所述UE移出所述LADN的服务区域。
  24. 根据权利要求22或23所述的方法，其特征在于，所述LADN会话对应的LADN的服务范围在所述锚点SMF的服务区域内。
  25. 一种通信装置，其特征在于，所述通信装置包括至少一个处理器和通信接口，所述通信接口用于所述网络装置与其他网络装置进行信息交互，当程序指令在所述至少一个处理器中执行时，使得所述网络装置实现如权利要求1至5中任一项所述的方法在中间会话管理网元SMF上的功能得以实现。
  26. 一种通信装置，其特征在于，所述通信装置包括至少一个处理器和通信接口，所述通信接口用于所述网络装置与其他网络装置进行信息交互，当程序指令在所述至少一个处理器中执行时，使得所述网络装置实现如权利要求6至10中任一项所述的方法在锚点SMF上的功能得以实现。
  27. 一种通信装置，其特征在于，所述通信装置包括至少一个处理器和通信接口，所述通信接口用于所述网络装置与其他网络装置进行信息交互，当程序指令在所述至少一个处理器中执行时，使得所述网络装置实现如权利要求11至17中任一项所述的方法在第一中间SMF上的功能得以实现。
  28. 一种通信装置，其特征在于，所述通信装置包括至少一个处理器和通信接口，所述通信接口用于所述网络装置与其他网络装置进行信息交互，当程序指令在所述至少一个处理器中执行时，使得所述网络装置实现如权利要求18至20中任一项所述的方法在目标AMF上的功能得以实现。
  29. 一种通信装置，其特征在于，所述通信装置包括至少一个处理器和通信接口，所述通信接口用于所述网络装置与其他网络装置进行信息交互，当程序指令在所述至少一个处理器中执行时，使得所述网络装置实现如权利要求21至24中任一项所述的方法在目标AMF上的功能得以实现。
  30. 一种通信系统，其特征在于，包括中间SMF和AMF，所述中间SMF用于执行权利要求1至5中任一项所述的方法，所述AMF用于执行权利要求6至10中任一项所述的方法。
  31. 一种芯片系统，其特征在于，所述芯片系统包括：
    存储器，所述存储器用于存储指令；
    处理器，所述处理器用于从所述存储器中调用并运行所述指令，使得安装有所述芯片系统的通信装置执行如权利要求1至5中任一项所述的方法，或使得所述通信装置执行如权利要求6至10中任一项所述的方法，或使得所述通信装置执行如权利要求11至17中任一项所述的方法，或使得所述通信装置执行如所述18至20中任一项所述的方法，或使得所述通信装置执行如所述21至24中任一项所述的方法。
  32. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有程序指令，当所述程序指令被直接或者间接执行时，使得如权利要求1至5中任一项所述的方法在所述中间SMF上的功能得以实现。
  33. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有程序指令，当所述程序指令被直接或者间接执行时，使得如权利要求6至10中任一项所述的方法在所述锚点SMF上的功能得以实现。
  34. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有程序指令，当所述程序指令被直接或者间接执行时，使得如权利要求11至17中任一项所述的方法在所述第一中间SMF上的功能得以实现：所述中间SMF、所述锚点SMF、所述AMF、所述第一中间SMF和所述目标AMF。
  35. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有程序指令，当所述程序指令被直接或者间接执行时，使得如权利要求18至20中任一项所述的方法在所述目标AMF上的功能得以实现。
  36. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有程序指令，当所述程序指令被直接或者间接执行时，使得如权利要求21至24中任一项所述的方法在所述目标AMF上的功能得以实现。
  37. 一种通信装置，其特征在于，包括：第一接收模块和第一处理模块；
    所述第一接收模块用于接收接入与移动管理网元AMF发送的请求消息，所述请求消息包括会话标识；
    所述第一处理模块用于当所述会话标识对应的会话为本地区域数据网络LADN会话时，所述第一处理模块拒绝所述会话标识对应的会话。
  38. 根据权利要求37所述的通信装置，其特征在于，所述通信装置还包括：第二处理模块；
    所述第二处理模块用于根据所述锚点SMF发送的会话上下文确定所述会话为LADN会话，所述会话上下文包括用于指示所述会话为所述LADN会话的第一指示信息；或者，
    所述通信装置还包括：第三处理模块；
    所述第三处理模块用于根据所述AMF发送的第二指示信息确定所述会话为LADN会话，所述第二指示信息用于指示UE在LADN的服务区域之外。
  39. 根据权利要求37或38所述的通信装置，其特征在于，所述通信装置还包括：第一发送模块；
    所述第一发送模块用于向所述AMF发送第一消息，所述第一消息包括原因信息。
  40. 根据权利要求39所述的通信装置，其特征在于，所述原因信息包括：
    所述LADN会话拒绝插入中间SMF和中间用户面网元UPF。
  41. 根据权利要求37-40中任一项所述的通信装置，其特征在于，所述LADN会话对应的LADN的服务区域在所述锚点SMF的服务区域内。
  42. 一种通信装置，其特征在于，包括：第一发送模块和第一接收模块；
    所述第一发送模块用于向中间SMF发送请求消息，所述请求消息包括会话标识，其中，所述中间SMF为UE移出锚点SMF的服务区域时所述AMF选择的SMF；
    所述第一接收模块用于接收所述中间SMF发送的第一消息，所述第一消息包括原因信息。
  43. 根据权利要求42所述的通信装置，其特征在于，所述原因信息包括：
    LADN会话拒绝插入中间SMF和中间UPF。
  44. 根据权利要求42或43所述的通信装置，其特征在于，所述通信装置还包括：第 二发送模块；
    所述第二发送模块用于向无线接入网RAN发送原因信息。
  45. 根据权利要求41-44中任一项所述的方法，其特征在于，所述通信装置还包括：第三发送模块；
    所述第三发送模块用于向所述锚点SMF发送会话释放请求消息，所述会话释放请求消息用于请求所述锚点SMF释放LADN会话。
  46. 根据权利要求43-45任一项所述的通信装置，其特征在于，所述LADN会话对应的LADN的服务区域在所述锚点SMF的服务区域内。
  47. 一种通信装置，其特征在于，包括：第一接收模块和第一处理模块；
    所述第一接收模块用于接收中间SMF发送的请求消息，所述请求消息包括会话标识，其中，所述中间SMF为UE移出所述通信装置的服务区域时AMF选择的SMF；
    所述第一处理模块用于当所述会话标识对应的会话为LADN会话时，所述第一处理模块拒绝所述会话标识对应的会话。
  48. 根据权利要求47所述的通信装置，其特征在于，所述请求消息用于请求插入所述中间SMF。
  49. 根据权利要求47或48所述的通信装置，其特征在于，所述通信装置还包括：第二处理模块；
    所述第二处理模块用于根据会话上下文确定当前会话为LADN会话；或者，
    所述第二处理模块还用于根据配置信息确定当前会话为LADN会话，所述配置信息包括所述当前会话对应的DNN为LADN。
  50. 根据权利要求47-49中任一项所述的通信装置，其特征在于，所述通信装置还包括：第二发送模块；
    所述第二发送模块用于向所述中间SMF发送第二消息，所述第二消息包括原因信息，所述原因信息用于指示所述会话激活失败；或者，
    所述原因信息用于指示中间SMF拒绝激活所述会话。
  51. 根据权利要求47-50中任一项所述的通信装置，其特征在于，所述第一处理模块拒绝所述会话标识对应的会话，包括：
    所述第一处理模块释放所述会话标识对应的会话；或者，
    所述第一处理模块去激活所述会话标识对应的会话；或者，
    所述第一处理模块拒绝激活或者切换所述会话标识对应的会话。
  52. 根据权利要求47-51中任一项所述的通信装置，其特征在于，所述原因信息包括：
    所述LADN会话拒绝插入中间SMF和中间UPF。
  53. 根据权利要求47-52中任一项所述的通信装置，其特征在于，所述LADN会话对应的LADN的服务区域在所述锚点SMF的服务区域内。
  54. 一种通信装置，其特征在于，包括：第一接收模块和第一发送模块；
    所述第一接收模块用于接收第一指示信息，其中，第一指示信息用于指示当前会话对应的数据网络名称DNN为LADN；
    所述第一发送模块用于向锚点SMF发送第二指示信息，其中，所述第二指示信息用于指示UE处于LADN的服务区域之外，所述锚点SMF为服务所述当前会话的锚点SMF；
    所述锚点SMF根据所述第二指示信息释放所述当前会话。
  55. 根据权利要求54所述的通信装置，其特征在于，所述通信装置还包括：第二接收模块和第一处理模块；
    所述第二接收模块用于接收目标AMF发送的第三消息；
    所述第一处理模块用于当所述第三消息不包括所述UE处于所述LADN的服务区域之外的指示信息时，所述第一处理模块确定UE处于所述LADN的服务区域之外，所述目标AMF为所述UE切换到的AMF。
  56. 根据权利要求54所述的通信装置，其特征在于，所述通信装置还包括：第二接收模块和第二发送模块；
    所述第二接收模块用于接收目标AMF发送的第三消息；
    当所述第三消息包括所述UE处于所述LANF的服务区域之外的指示信息时，所述第二发送模块向锚点SMF发送所述第二指示信息。
  57. 一种通信装置，其特征在于，包括：第一接收模块，第一处理模块和第一发送模块；
    所述第一接收模块用于接收源AMF发送的第一指示信息，所述第一指示信息用于指示当前会话对应的DNN为LADN；
    当所述第一处理模块确定UE移出所述LADN的服务的区域时，所述第一发送模块用于向第一中间SMF发送第二指示信息，所述第二指示信息用于指示所述UE处于LADN的服务区域之外，所述第一中间SMF用于控制与目标基站接口的中间UPF。
  58. 根据权利要求57所述的通信装置，其特征在于，所述当所述第一处理模块确定所述UE移出所述LADN的服务区域，包括：
    当所述第一处理模块上未配置所述LADN的信息时，所述第一处理模块确定所述UE移出所述LADN的服务区域。
  59. 根据权利要求57所述的通信装置，其特征在于，所述当所述第一处理模块确定所述UE移出所述LADN的服务区域，包括：
    当所述第一处理模块配置有所述LADN的信息时，所述第一处理模块根据所述LADN的信息以及所述UE的位置确定所述UE移出所述LADN的服务区域。
  60. 根据权利要求58或59所述的通信装置，其特征在于，所述LADN会话对应的LADN的服务范围在所述锚点SMF的服务区域内。
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