WO2020253747A1 - Procédé de gestion de session, entité de fonction de gestion de session (smf), terminal, et entité côté réseau - Google Patents

Procédé de gestion de session, entité de fonction de gestion de session (smf), terminal, et entité côté réseau Download PDF

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WO2020253747A1
WO2020253747A1 PCT/CN2020/096660 CN2020096660W WO2020253747A1 WO 2020253747 A1 WO2020253747 A1 WO 2020253747A1 CN 2020096660 W CN2020096660 W CN 2020096660W WO 2020253747 A1 WO2020253747 A1 WO 2020253747A1
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tunnel
pdu session
shared tunnel
shared
entity
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PCT/CN2020/096660
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English (en)
Chinese (zh)
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谷群
李爱华
张彦
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中国移动通信有限公司研究院
中国移动通信集团有限公司
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Publication of WO2020253747A1 publication Critical patent/WO2020253747A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/25—Maintenance of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release

Definitions

  • the present disclosure relates to the field of communication technologies, and in particular, to a session management method, a session management function (SMF) entity, a terminal, and a network-side entity.
  • SMS session management function
  • 5G networks Compared with 4G networks, 5G networks have introduced a service-oriented function design to achieve flexible customization and combination of network functions.
  • the core network uses control and forwarding concepts to reduce and simplify the user plane to achieve efficient forwarding;
  • the access network uses Centralized Unit (CU)/Distributed Unit (DU) separation to achieve wireless resources Centralized control and collaboration.
  • CU Centralized Unit
  • DU Distributed Unit
  • the embodiments of the present disclosure provide a session management method, an SMF entity, a terminal, and a network-side entity to solve the problem that multiple tunnels are difficult to implement in related technologies and cause resource waste.
  • the embodiments of the present disclosure provide a session management method for a session management function SMF entity, and the session management method includes:
  • the tunnel is allocated according to the information of the shared tunnel.
  • the embodiments of the present disclosure provide a session management method for a terminal, and the session management method includes:
  • embodiments of the present disclosure provide a session management method for a network-side entity, and the session management method includes:
  • the tunnel usage policy is used by the SMF entity to determine whether the protocol data unit PDU session can be transmitted using the shared tunnel, or used by the SMF entity to determine whether the PDU session is combined with the locally saved tunnel usage policy You can use shared tunnel transmission.
  • the embodiments of the present disclosure provide a session management method for a network side device, and the session management method includes:
  • the shared tunnel is released; otherwise, the shared tunnel is maintained, and the association relationship between the released PDU session and the shared tunnel is deleted.
  • the embodiments of the present disclosure provide a session management function SMF entity, including: a first processor and a first transceiver; wherein,
  • the first processor is configured to perform tunnel allocation according to the information of the shared tunnel when the protocol data unit PDU session can be transmitted using the shared tunnel.
  • embodiments of the present disclosure provide a terminal, including: a second processor and a second transceiver; wherein,
  • the second transceiver is configured to send instruction information to the network side device, where the instruction information is used to indicate that the protocol data unit PDU session corresponding to the terminal can be transmitted using a shared tunnel.
  • embodiments of the present disclosure provide a network-side entity, including: a third processor and a third transceiver; wherein,
  • the third transceiver is configured to send a tunnel usage policy to a session management function SMF entity, where the tunnel usage policy is used by the SMF entity to determine whether a protocol data unit PDU session can be transmitted using a shared tunnel, or used by the SMF entity in conjunction with local
  • the saved tunnel usage policy determines whether the PDU session can use the shared tunnel transmission.
  • embodiments of the present disclosure provide a network-side device, including: a fourth processor and a fourth transceiver; wherein,
  • the fourth processor is configured to establish an association relationship between the protocol data unit PDU session and the allocated shared tunnel; in the case that the PDU session is released, determine whether there is still an associated PDU session on the shared tunnel. Released; if no associated PDU session on the shared tunnel has not been released, release the shared tunnel, otherwise, maintain the shared tunnel, and delete the association between the released PDU session and the shared tunnel relationship.
  • the embodiments of the present disclosure provide a session management function SMF entity, including a first processor, a first memory, and a computer program stored on the first memory and capable of running on the first processor, When the computer program is executed by the first processor, the steps in the session management method provided in the first aspect are implemented.
  • an embodiment of the present disclosure provides a terminal, including a second processor, a second memory, and a computer program stored on the second memory and capable of running on the second processor.
  • the computer program When executed by the second processor, the steps in the session management method provided in the second aspect are implemented.
  • an embodiment of the present disclosure provides a network-side entity, including a third processor, a third memory, and a computer program stored on the third memory and running on the third processor, so When the computer program is executed by the third processor, the steps in the session management method provided in the third aspect are implemented.
  • embodiments of the present disclosure provide a network side device, including a fourth processor, a fourth memory, and a computer program stored on the fourth memory and capable of running on the fourth processor, so When the computer program is executed by the fourth processor, the steps in the session management method provided in the fourth aspect are implemented.
  • embodiments of the present disclosure provide a computer-readable storage medium having a computer program stored on the computer-readable storage medium, and when the computer program is executed by a processor, the session management method provided in the first aspect is implemented
  • the steps in either implement the steps in the session management method provided in the second aspect, or implement the steps in the session management method provided in the third aspect, or implement the steps in the session management method provided in the fourth aspect.
  • the tunnel allocation can be performed according to the information of the shared tunnel. Then, in at least some cases, the transmission of the PDU session can be realized through the shared tunnel, that is, The PDU session does not necessarily have to be transmitted through an ordinary tunnel. Therefore, compared with the related art, the embodiments of the present disclosure can realize the multiplexing of the tunnel, so as to improve the utilization rate of the tunnel, thereby reducing the idleness and waste of resources.
  • Figure 1 is an architecture diagram of a 5G network
  • Figure 2 is a flow chart of session establishment in related technologies
  • FIG. 3 is a flowchart of the first session management method provided by an embodiment of the present disclosure
  • Figure 4 is a flow chart of establishing a shared tunnel in an embodiment of the present disclosure
  • FIG. 5 is a flowchart of deleting a shared tunnel in an embodiment of the present disclosure.
  • Fig. 6 is a flowchart of a second session management method provided by an embodiment of the present disclosure.
  • FIG. 7 is a flowchart of a third session management method provided by an embodiment of the present disclosure.
  • FIG. 8 is a flowchart of a fourth session management method provided by an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of an SMF entity provided by an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a terminal provided by an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of a network-side entity provided by an embodiment of the present disclosure.
  • FIG. 12 is a schematic structural diagram of a network-side device provided by an embodiment of the present disclosure.
  • FIG. 13 is a schematic structural diagram of another SMF entity provided by an embodiment of the present disclosure.
  • FIG. 14 is a schematic structural diagram of another terminal provided by an embodiment of the present disclosure.
  • 15 is a schematic structural diagram of another network-side entity provided by an embodiment of the present disclosure.
  • FIG. 16 is a schematic structural diagram of another network side device provided by an embodiment of the present disclosure.
  • the 5G network architecture mainly includes an authentication service function (Authentication Server Function, AUSF) entity, a network slice selection function (Network Slice Selection Function, NSSF) entity, and a policy control function (Policy Control Function, PCF).
  • AUSF Authentication Server Function
  • NSSF Network Slice Selection Function
  • PCF Policy Control Function
  • Entities network element data warehouse function (NF Repository Function, NRF) entities, access and mobility management function (Access and Mobility Management Function, AMF) entities, session management function (Session Management Function, SMF) entities, unified data management Functional network elements such as Unified Data Management (UDM) entities and User Plane Function (UPF) entities; among them, the initial service requirements are: AMF, SMF, PCF, AUSF, UDM, NSSF, etc., not yet The service-oriented ones are NEF, UDR, UPF.
  • NRF network element data warehouse function
  • AMF Access and Mobility Management Function
  • SMF Session Management Function
  • UDM User Plane Function
  • UPF User Plane Function
  • SMF corresponds to some functions of the control plane serving gateway (Serving Gateway-C, SGW-C) and the control plane packet data network gateway (Packet data network Gateway-C, PGW-C) in 4G.
  • SMF is responsible for the life cycle management of 5G user sessions, IP address allocation, data routing, business continuity management, policy rule matching, and traffic accounting processing.
  • the session management related functions that SMF should support include the following nine:
  • IPv4 Internet Protocol version 4
  • IPv6 IPv6, Ethernet and unstructured PDU session types
  • the subscription type can include allowed and default PDU session types, allowed and default session and service continuity (Session and Service Continuity, SSC) mode, Quality of Service (QoS) information and IP address or prefix;
  • SSC session and Service Continuity
  • QoS Quality of Service
  • DDN Digital Data Network
  • EPS Evolved Packet System
  • TFT Traffic Flow Template
  • PCO Point of Control and Observation
  • SMF should support the allocation of IP addresses according to the PDU session type; among them, the allocation method can be through local allocation, or through dynamic host configuration protocol (Dynamic Host Configuration Protocol, DHCP) v4/DHCPv6 and other methods from the external network Obtain user IP address.
  • DHCP Dynamic Host Configuration Protocol
  • SMF For non-multi-homing (multi-homing) IPv4 or IPv6 sessions, SMF only allocates one IPv4 or IPv6 address for the UE; for multi-homing sessions, SMF can allocate multiple IPv6 addresses.
  • SMF For the data routing function, SMF should support the selection of UPF based on information such as local policy, data network name (DNN), and application layer function (AF) policy. To support the upstream traffic offloading function of PDU sessions, SMF should support the following two items:
  • SMF should support the following two:
  • SMF should also support other data routing functions, mainly including the following six:
  • LADN Local Area Data Network
  • (b10) Support the business chain function, that is, locally configure the strategy related to the business chain strategy ID, and when the PCC rule contains business chain control information, the information is passed to UPF for execution.
  • the SMF in order to support the session and service continuity under mobility, the SMF should support the SSC mode in the UE session establishment request and the UE subscription information, and select the SSC mode of the session. If the SMF does not support this mode The session establishment request is rejected.
  • SMF should support the following functions:
  • (c1) SMF first triggers the release of the current session, and then notifies the UE to establish a new session that accesses the same data network (DN);
  • SMF should support the following functions:
  • (c3) SMF first notifies the UE to establish a new session to access the same DN, and indicates the retention time of the current session of the UE; after the current session retention time expires, the SMF triggers the release of the session (the UE can also trigger the session release in advance);
  • SMF should support local configuration and receive policy control related functions issued by PCF, which mainly include the following five items:
  • TDF-Application-Identifier TDF-Application-Identifier
  • the SMF should support the delivery of the charging policy to the UPF, and at the same time support the charging information received from the UPF to the charging gateway. At the same time, the SMF should support the charging suspension function.
  • FIG. 2 illustrates a flowchart of establishing a PDU session in the related art. It should be noted that Fig. 2 is for the case where the UE has already been registered on the AMF. Then, unless it is an emergency registered UE, the AMF has retrieved user subscription data from the UDM. As shown in Figure 2, the process of establishing a PDU session in the related technology includes the following steps:
  • the UE sends a NAS message (S-NSSAI(s), DNN, PDU session ID, request type, old PDU session ID, N1 SM container) to the AMF.
  • S-NSSAI(s) S-NSSAI(s)
  • DNN DNN
  • PDU session ID PDU session ID
  • request type old PDU session ID
  • N1 SM container carries a PDU session establishment request
  • AMF performs SMF selection and stores the association of S-NSSAI(s), DNN, PDU session ID, SMF ID, and access type of the PDU session.
  • AMF sends a context request (which can also be called Nsmf_PDUSession_CreateSMContext Request) message for SMF to create PDU session management to SMF, which carries the user-related information, such as User Location Information (ULI), and PDU session status notification Subscription, DNN selection mode, etc.;
  • a context request which can also be called Nsmf_PDUSession_CreateSMContext Request
  • UAI User Location Information
  • PDU session status notification Subscription DNN selection mode, etc.
  • the SMF responds to the AMF with the Nsmf_PDUSession_CreateSMContext Response message, which carries the reason value and the SM context.
  • SMF can select PCF according to AMF's instructions or local configuration; otherwise, SMF can apply local policies; SMF can perform the session management (Session Management, SM) policy association establishment process in order to PCF establishes SM policy association and obtains default PCC rules for PDU sessions;
  • session management Session Management, SM
  • step (7) SMF selects UPF based on the location of UPF, DNN, weight information, etc. If PCC rules are not required as the input for UPF selection, step (7) can be executed after step (8);
  • the SMF can execute the SM policy association modification process initiated by the SMF to provide information about the policy control request trigger conditions that have been met; if the request type is "initial request", dynamic PCC is deployed, and the PDU session type is IPv4, IPv6 or IPv4v6, then SMF will use the assigned UE IP address/prefix to notify PCF (if the policy control request trigger condition is met);
  • SMF initiates the establishment of an N4 session and cooperates with UPF to allocate CN Tunnel Info (ie, core network channel information);
  • AMF sends a NAS message to the radio access network (Radio Access Network, RAN), including N2 PDU session request, carrying CN Tunnel Info obtained from SMF;
  • radio access network Radio Access Network, RAN
  • the RAN allocates access network channel information (Access Network, AN) Tunnel Info for the UE, and the PDU session is successfully established;
  • the RAN responds to the N2 PDU session response message to the AMF, carrying the reason value and AN Tunnel Info, etc.;
  • AMF sends a context request for SMF update PDU session management (it can also be called Nsmf_PDUSession_UpdateSMContext request, which carries SM context ID, N2 SM information, and request type), and AMF will receive N2 SM information (carrying AN Tunnel) from the RAN Info, etc.) forwarded to SMF;
  • Nsmf_PDUSession_UpdateSMContext request which carries SM context ID, N2 SM information, and request type
  • SMF provides tunnel information and corresponding forwarding rules to UPF.
  • the SMF responds to the AMF with the Nsmf_PDUSession_UpdateSMContext Response message, carrying the reason value.
  • the data plane transmission channel of each user is usually distinguished by the GPRS Tunnelling Protocol (GTP) tunnel between each network element.
  • GTP GPRS Tunnelling Protocol
  • TEID network element IP+TEID
  • SAE GW performance index of SAE GW is usually the number of PDU sessions; among them, SAE GW is the name when the two network elements, SGW and PGW, are jointly set up.
  • embodiments of the present disclosure provide a session management method, SMF entity, terminal, network-side entity, network-side device, and computer-readable storage medium.
  • FIG. 3 shows a flowchart of a first session management method provided by an embodiment of the present disclosure. This method is applied to SMF entities. As shown in Figure 3, the session management method includes the following steps:
  • Step 301 In the case that the PDU session can be transmitted using the shared tunnel, tunnel allocation is performed according to the information of the shared tunnel.
  • the shared tunnel (also referred to as a public tunnel) is a concept opposite to the ordinary tunnel (also referred to as a dedicated tunnel) in the following text.
  • the shared tunnel can be understood as not specifically established for a certain PDU session. Tunnel, multiple PDU sessions can all be transmitted through a shared tunnel.
  • the information of the shared tunnel can be used to characterize whether there is an established shared tunnel.
  • the content represented by the information of the shared tunnel is different, there may be a certain difference in the way of tunnel allocation according to the information of the shared tunnel.
  • the tunnel allocation can be performed according to the information of the shared tunnel. Then, in at least some cases, the transmission of the PDU session can be realized through the shared tunnel, that is, The PDU session does not necessarily have to be transmitted through an ordinary tunnel. Therefore, compared with the related art, the embodiments of the present disclosure can realize the multiplexing of the tunnel, so as to improve the utilization rate of the tunnel, thereby reducing the idleness and waste of resources.
  • the connection density of the Internet of Things in the 5G vision is 1 million devices/square kilometer.
  • Such a huge connection scale is a huge for core network equipment. challenge. If a corresponding tunnel is allocated for each user of this type of business, and based on the "always online" principle, it will cause a great waste of network resources.
  • the method of the embodiments of the present disclosure can realize multiplexing of tunnels, and can greatly save network resources in a scenario where there are many low-frequency small packet services.
  • the session management method further includes:
  • the PDU session cannot be transmitted using the shared tunnel, no matter whether there is an established shared tunnel currently, the PDU session cannot be transmitted through the shared tunnel.
  • a new ordinary tunnel can be created, and Allocate the newly-built ordinary tunnel to the PDU session, so as to realize the transmission of the PDU session through the newly-built ordinary tunnel.
  • performing tunnel allocation according to the information of the shared tunnel includes at least one of the following steps:
  • the PDU session can be transmitted using a shared tunnel, and there is an established shared tunnel, assign the established shared tunnel to the PDU session;
  • the PDU session can use the shared tunnel for transmission, but there is no established shared tunnel, a new shared tunnel is created and the newly created shared tunnel is allocated to the PDU session.
  • the PDU session can be transmitted using a shared tunnel, it can be determined whether there is an established shared tunnel currently.
  • the established shared tunnel can be directly assigned to the PDU session, so as to realize the transmission of the PDU session through the currently existing tunnel that can be directly reused. Thereby reducing the idleness and waste of resources.
  • the judgment result is no, it means that there is no tunnel that can be directly reused. Then, you can create a new shared tunnel and assign the newly created shared tunnel to the PDU session to realize the transmission of the PDU session through the newly created shared tunnel. In addition, the newly-built shared tunnel can also be multiplexed to realize the transmission of subsequent PDU sessions, thereby reducing the idleness and waste of resources.
  • the transmission of the PDU session can finally be realized through the shared tunnel to reduce the idleness and waste of resources.
  • assigning the established shared tunnel to the PDU session specifically includes:
  • the PDU session can be transmitted using a shared tunnel and there is an established shared tunnel, according to the corresponding relationship between the tunnel selection parameters and the shared tunnel identifier, determine whether there is a target share matching the PDU session in the established shared tunnel tunnel;
  • the target shared tunnel is allocated to the PDU session.
  • the corresponding relationship between the tunnel selection parameter and the shared tunnel identifier can be stored in advance, and any shared tunnel identifier in the corresponding relationship may be an identifier of an established tunnel that can perform session transmission normally.
  • the shared tunnel identifier may be a tunnel ID.
  • the tunnel selection parameters can be obtained for the PDU session to be transmitted, and whether the obtained tunnel selection exists in the pre-stored correspondence relationship can be judged parameter. If the judgment result is yes, the shared tunnel identifier corresponding to the acquired tunnel selection parameter recorded in the correspondence relationship can be determined, and the shared tunnel with the shared tunnel identifier can be determined as the target shared tunnel matching the PDU session. After that, the PDU session can be allocated to the target shared tunnel, so as to realize the transmission of the PDU session through the target shared tunnel.
  • the offloading of the PDU session can be realized, which can avoid excessive transmission pressure of a single tunnel.
  • the offloading of the PDU session can be realized, which can avoid excessive transmission pressure of a single tunnel.
  • the offloading of the PDU session can be realized, which can avoid excessive transmission pressure of a single tunnel.
  • by assigning PDU sessions with the same tunnel selection parameters to the same shared tunnel refined management of the tunnel can be realized.
  • assigning the established shared tunnel to the PDU session also includes:
  • the tunnel selection parameters can be obtained for the PDU session to be transmitted, and whether the obtained tunnel selection exists in the pre-stored correspondence relationship can be judged parameter. If the judgment result is no, it can be considered that the shared tunnel identifier corresponding to the acquired tunnel selection parameter is not recorded in the corresponding relationship, and then it can be considered that there is no target shared tunnel matching the PDU session among the established shared tunnels. In this case, you can create a new shared tunnel and allocate the newly created shared tunnel to the PDU session, so as to realize the transmission of the PDU session through the newly created shared tunnel. In addition, the newly-built shared tunnel can also be multiplexed to realize the transmission of subsequent PDU sessions, thereby reducing the idleness and waste of resources.
  • the tunnel selection parameters include at least one of the following parameters: user group identification parameters, slice identification parameters, DNN identification parameters, user number segment parameters, and user location parameters.
  • the user group identification parameter can be represented by group ID; the slice can be represented by NSSAI.
  • the tunnel selection parameters including user information such as user group identification parameters, user number segment parameters, and user location parameters may be actively reported by the terminal.
  • different tunnels can be used to transmit PDU sessions. It can better realize the offloading of PDU sessions.
  • UPF has the function of supporting routing and forwarding of data packets.
  • the service identification function that is, UPF supports packet detection according to the locally configured service flow detection template or PFD issued by SMF, and supports the detection of IPv4 and IPv6 PDU session types.
  • the detection information mainly includes PDU sessions, QoS Flow ID (QFI), service ID, source/destination IP address or prefix and port number, protocol type and other IP packet filtering rule sets, so as to tunnel different sessions of different users, or different sessions of the same user Select, for the corresponding destination IP, use the shared tunnel.
  • QFI QoS Flow ID
  • service ID service ID
  • source/destination IP address or prefix and port number protocol type and other IP packet filtering rule sets
  • the specific correspondence between the user group and the destination IP address (which can be used as the tunnel ID) is taken as an example, as shown in Table 1 below:
  • UPF and RAN can store the correspondence between user groups and tunnel IDs respectively, so that for different users, different services, different user groups (group ID), different slices (NSSAI), different DNNs, and different Number segments, or even different locations, can use different tunnel usage strategies for transmission.
  • the tunnel here can be a shared tunnel or a user-specific tunnel.
  • the method further includes:
  • the second tunnel usage policy sent by the PCF entity According to the first tunnel usage policy stored locally by the SMF entity, the second tunnel usage policy sent by the PCF entity, the third tunnel usage policy sent by the UDM entity, the fourth tunnel usage policy sent by the terminal, and the fifth tunnel usage policy sent by the AMF entity And at least one of the sixth tunnel usage policies sent by the UPF entity to determine whether the PDU session can be transmitted using the shared tunnel.
  • the SMF local configuration can be performed in advance, so that the SMF entity locally stores the first tunnel usage policy, and the first tunnel usage policy can be used to characterize whether the PDU session can be transmitted using the shared tunnel.
  • the PCF policy can also be issued in advance, the UDM contract is issued in advance, and the UE’s active reporting is performed in advance, so that the SMF entity can obtain the second tunnel use strategy to the sixth tunnel use strategy, and the second tunnel use strategy to The sixth tunnel usage strategy can be used to characterize whether the PDU session can be transmitted using the shared tunnel.
  • the tunnel usage policies from different entities can be sent to SMF as part of the data provided by them, for example, can be used as part of PCF policy subscription data, or as part of AMF slice information, or as part of Part of the UDM subscription data is sent to the SMF, but it can also be sent to the SMF together with the data of these functional network elements.
  • tunnel usage strategies from different entities may be tunnel usage strategies defined from different levels.
  • the PDU session can be transmitted using the shared tunnel according to at least one of the first tunnel use policy to the sixth tunnel use policy. Specifically, when at least one of the first tunnel usage policy to the sixth tunnel usage policy indicates that the shared tunnel can be used for transmission, it can be determined that the PDU session can be transmitted using the shared tunnel, and the PDU session can be transmitted through the shared tunnel. , Or when the results obtained according to multiple tunnel usage strategies conflict, the result determined by the tunnel usage strategy with higher priority is adopted.
  • this embodiment can easily determine whether the PDU session can be transmitted using the shared tunnel, so as to guide the transmission of the PDU session through the determination result.
  • the session management method further includes:
  • the shared tunnel is released; otherwise, the shared tunnel is maintained, and the association relationship between the released PDU session and the shared tunnel is deleted.
  • the user can initiate the PDU session release, or the PCF can initiate the PDU session release, or the AMF can initiate the PDU session release, or the RAN can initiate the PDU session release, or the SMF itself can initiate the PDU session release. .
  • the shared tunnel can be released directly to save resources caused by maintaining the shared tunnel Consumption and power consumption.
  • the shared tunnel may not be released, and the released PDU session and the shared tunnel may be deleted.
  • the association relationship between the tunnels in this way, the association relationship between the released PDU session and the shared tunnel is released, and other associated PDU sessions can be normally transmitted through the shared tunnel.
  • this embodiment can not only ensure the normal transmission of the PDU session, but also save unnecessary resource consumption and power consumption.
  • the association relationship is stored in RAN and UPF.
  • RAN can do data packet encapsulation for uplink packets, and UPF can do data packet disassembly; for downlink packets, UPF can do data packet encapsulation , RAN can do data packet disassembly.
  • this embodiment provides a PDU session establishment, data transmission and PDU session deletion process based on 5G tunnel multiplexing, which fully considers the user plane tunnel multiplexing, and is not affected by the specific types of user messages. Changes in scenarios and specific implementation details will not affect the protection points.
  • the user tunnel multiplexing strategy can be determined based on the following four conditions: A. Local configuration based on SMF; B. PCF policy issuance; C. UDM subscription and issuance; D. UE actively reports the decision
  • the strategy of user tunnel multiplexing is based on the PDU session establishment, data transmission and PDU session deletion process of 5G tunnel multiplexing.
  • SMF can choose whether to use shared tunnel or not according to (A) SMF local configuration, (B) PCF policy issuance, (C) UDM contract issuance or (D) UE proactively report and other related messages; in the case of choosing to use shared tunnel If there is a related tunnel, it will be reused directly; if there is no existing tunnel, a new shared tunnel will be created; if there are users or services of the same type later, the newly created shared tunnel will be reused.
  • the UE will send a PDU session establishment request to the AMF and report user information, where the user can actively report whether to use the shared tunnel and the specific user group identification, that is, the corresponding condition D UE actively reports;
  • AMF will select SMF, and in third step, AMF will forward the message of whether to multiplex the tunnel to SMF.
  • the user's subscription data carries relevant messages and is cached on the AMF side (corresponding to condition C UDM signing and issuing); the second is from the PDU session establishment phase, the message that the UE reports on the application to use the shared tunnel (corresponding to the condition D UE actively reports );
  • step 4 in Figure 4 SMF interacts with UDM to update the subscription information, which includes the user group identification and the message to use the shared tunnel (corresponding to the condition C) UDM subscription delivery; or, SMF can configure relevant information locally, To carry out tunnel multiplexing (corresponding condition A is based on SMF local configuration);
  • step 7 in Figure 4 SMF selects PCF according to AMF instructions or local configuration. At this time, PCF can issue relevant policies, including user group messages, and whether to use shared tunnels (corresponding to condition B PCF policy issuance);
  • Step 8 in Figure 4 SMF selects UPF based on the location of UPF, DNN, weight information, etc. (SMF can also be configured locally based on different services, different user groups, and even different locations to determine different tunnel multiplexing strategies for users, that is, corresponding condition A is based on SMF local configuration);
  • SMF and UPF collaborate to find that the user should use a shared tunnel, and the shared tunnel already exists, they do not need to redistribute CN Tunnel Info, they only need to distribute the existing CN Tunnel Info to each network element according to the following procedure. ;
  • SMF and UPF collaborate to find that the user should use a shared tunnel, and the shared tunnel does not yet exist
  • SMF will inform AMF about the CN Tunnel Info that is jointly allocated with UPF, and carry the user group identification that has been obtained and whether to use the shared tunnel.
  • Messages whether from UE report, SMF local configuration, UDM issue related contract or PCF issue related policy); RAN will forward all messages obtained from AMF to UE;
  • Step 13 in Figure 4 RAN allocates AN Tunnel info and brings it to the UE;
  • Step 14 in Figure 4 RAN sends AN Tunnel info to AMF;
  • step 16 in Figure 4 AMF forwards AN Tunnel info to SMF, and SMF forwards to UPF;
  • tunnel multiplexing can be finally completed. If there is no existing tunnel, the new shared tunnel is successfully created.
  • the process of deleting a shared tunnel may be:
  • step 1a is the release of the PDU session initiated by the user
  • step 1b is the release of the PDU session initiated by the PCF
  • step 1c is the release of the PDU session initiated by the AMF
  • step 1d is initiated by the RAN PDU session release
  • step 1e is to release the PDU session initiated by SMF itself;
  • SMF When SMF receives a session release request or SMF decides to release the session, SMF detects whether the session has a corresponding shared tunnel. If so, it needs to detect the number of users on this tunnel. If there are more than one shared tunnel User, when one of the users goes offline, delete the binding relationship between the tunnel and the user on the RAN side and the UPF side through the subsequent process, but the entire tunnel cannot be deleted; if there is only one user left on the shared tunnel, then After the user goes offline, SMF initiates the subsequent normal tunnel-related session deletion process to delete the shared tunnel;
  • SMF informs UPF to release the session through the second step message
  • AMF notifies the RAN to release the resources of the N2 interface
  • SMF needs to notify AMF of the session management context of the PDU session release, which needs to carry SMF ID, PDU session ID, DNN and S-NSSAI;
  • the SMF also needs to notify the PCF that the policy control function of this session is terminated.
  • this embodiment proposes a scheme for effectively multiplexing tunnels for 5G users.
  • the main points of the scheme are mainly reflected in the following three aspects:
  • SMF can be selected based on A SMF local configuration, B PCF policy issuance, C UDM contract issuance or D UE actively report and other related messages to choose whether to use the shared tunnel.
  • B PCF policy issuance e.g., B PCF policy issuance
  • C UDM contract issuance e.g., D UE actively report and other related messages to choose whether to use the shared tunnel.
  • choosing to use the shared tunnel if there is relevant If there is no existing tunnel, then create a new shared tunnel; if there are users or services of the same type later, reuse the newly created shared tunnel.
  • UPF and RAN respectively store the correspondence between user groups and tunnel IDs.
  • group ID different user groups
  • NSSAI different slices
  • DNNs different number segments
  • the tunnels can be shared tunnels or user-specific tunnels.
  • SMF when SMF receives a session release request or SMF decides to release the session, SMF detects whether the session has a corresponding shared tunnel. If so, it needs to detect the number of users or PDU sessions on the tunnel. If the shared tunnel If there are still the number of users or PDU sessions, when one of the users is offline, the binding relationship between the tunnel and the user can be deleted on the RAN side and the UPF side through the session release process of the present disclosure, but the entire tunnel cannot be deleted; if There is only one user left on the shared tunnel, and after the user goes offline, the SMF initiates a normal tunnel-related session release process to release the shared tunnel.
  • the user session can be managed and controlled more conveniently, the idleness and waste of resources can be reduced to a certain extent, and the utilization rate of the tunnel can be greatly improved.
  • FIG. 6 shows a flowchart of a second session management method provided by an embodiment of the present disclosure. The method is applied to a terminal. As shown in FIG. 6, the session management method includes the following steps:
  • Step 601 Send instruction information to the network side device, where the instruction information is used to indicate that the PDU session corresponding to the terminal can be transmitted using the shared tunnel.
  • the terminal may send to the network side device the indication information used to indicate that the PDU session corresponding to the terminal can be transmitted using the shared tunnel.
  • the transmission of the PDU session can be realized through the shared tunnel, that is, the PDU session does not have to be transmitted through the ordinary tunnel. Therefore, compared with the related art, the embodiments of the present disclosure can realize the multiplexing of the tunnel, so as to improve the utilization rate of the tunnel, thereby reducing the idleness and waste of resources.
  • FIG. 7 shows a flowchart of a third session management method provided by an embodiment of the present disclosure. This method is applied to a network side entity. As shown in FIG. 7, the session management method includes the following steps:
  • Step 701 Send the tunnel usage policy to the SMF entity.
  • the tunnel usage policy is used by the SMF entity to determine whether the PDU session can be transmitted using the shared tunnel, or used by the SMF entity to determine whether the PDU session can be transmitted using the shared tunnel in combination with the locally saved tunnel usage policy .
  • the network-side entity includes at least one of the following entities: a PCF entity, a UDM entity, an AMF entity, and a UPF entity.
  • the network-side entity can send the tunnel usage policy to the SMF so that the SMF can determine whether the PDU session can use the shared tunnel based on this.
  • the shared tunnel can be used. Realize the transmission of PDU conversation, that is to say, PDU conversation does not have to carry on transmission through ordinary tunnel. Therefore, compared with the related art, the embodiments of the present disclosure can realize the multiplexing of the tunnel, so as to improve the utilization rate of the tunnel, thereby reducing the idleness and waste of resources.
  • FIG. 8 shows a flowchart of a fourth session management method provided by an embodiment of the present disclosure. This method is applied to a network side device. As shown in Figure 8, the session management method includes the following steps:
  • Step 801 Establish an association relationship between the PDU session and the allocated shared tunnel
  • Step 802 in the case that the PDU session is released, determine whether there is still an associated PDU session on the shared tunnel that has not been released; if there is no associated PDU session on the shared tunnel that has not been released, step 803 is executed, otherwise, execute Step 804;
  • Step 803 Release the shared tunnel
  • Step 804 Maintain the shared tunnel, and delete the association relationship between the released PDU session and the shared tunnel.
  • the transmission of the PDU session can be realized through a shared tunnel, that is, the PDU session does not necessarily need to be transmitted through a common tunnel. Therefore, compared with the related art, the embodiments of the present disclosure can realize the multiplexing of the tunnel, so as to improve the utilization rate of the tunnel, thereby reducing the idleness and waste of resources.
  • the embodiments of the present disclosure when the PDU session is released, it is possible to perform corresponding processing operations based on whether there are other associated PDU sessions on the shared tunnel allocated to the released PDU session, so as to ensure the PDU session Normal transmission can save unnecessary resource consumption and power consumption.
  • FIG. 9 shows a schematic structural diagram of an SMF entity (ie, SMF entity 900) provided by an embodiment of the present disclosure.
  • the SMF entity 900 includes:
  • the first allocation module 901 is configured to perform tunnel allocation according to the information of the shared tunnel when the PDU session can be transmitted using the shared tunnel.
  • the SMF entity 900 further includes:
  • the second allocation module is used to create a new ordinary tunnel when the PDU session cannot be transmitted using the shared tunnel, and allocate the newly created ordinary tunnel to the PDU session.
  • the first allocation module 901 is used for at least one of the following:
  • the PDU session can be transmitted using a shared tunnel, and there is an established shared tunnel, assign the established shared tunnel to the PDU session;
  • the PDU session can use the shared tunnel for transmission, but there is no established shared tunnel, a new shared tunnel is created and the newly created shared tunnel is allocated to the PDU session.
  • the first allocation module 901 specifically includes:
  • the judging sub-module is used to determine whether there is a shared tunnel in the established shared tunnel according to the corresponding relationship between the tunnel selection parameter and the shared tunnel identifier when the PDU session can be transmitted using the shared tunnel and there is an established shared tunnel.
  • the first allocation sub-module is used to allocate the target shared tunnel to the PDU session when the target shared tunnel exists in the established shared tunnel.
  • the first allocation module 901 further includes:
  • the second allocation sub-module is used to create a new shared tunnel when there is no target shared tunnel in the established shared tunnel, and allocate the newly created shared tunnel to the PDU session.
  • the tunnel selection parameters include at least one of the following parameters: user group identification parameters, slice identification parameters, DNN identification parameters, user number segment parameters, and user location parameters.
  • the SMF entity 900 also includes
  • the determining module is used to, when the PDU session can be transmitted using the shared tunnel, before the tunnel is allocated according to the information of the shared tunnel, according to the first tunnel usage strategy stored locally by the SMF entity, the second tunnel usage strategy sent by the PCF entity, At least one of the third tunnel usage policy sent by the UDM entity, the fourth tunnel usage policy sent by the terminal, the fifth tunnel usage policy sent by the AMF entity, and the sixth tunnel usage policy sent by the UPF entity to determine whether the PDU session can use sharing Tunnel for transmission.
  • the SMF entity 900 further includes:
  • the establishment module is used to establish the association relationship between the PDU session and the allocated shared tunnel
  • the judging module is used to judge whether there is still an associated PDU session on the shared tunnel that has not been released when the PDU session is released;
  • the processing module is used to release the shared tunnel when there is no associated PDU session on the shared tunnel that has not been released; otherwise, the shared tunnel is maintained and the association relationship between the released PDU session and the shared tunnel is deleted.
  • the association relationship is stored in RAN and UPF.
  • the SMF entity 900 can implement each process of the SMF entity in the foregoing method embodiment, and in order to avoid repetition, details are not described herein again. In this way, compared with related technologies, the embodiments of the present disclosure can realize multiplexing of tunnels, so as to improve the utilization rate of the tunnels, thereby reducing idleness and waste of resources.
  • FIG. 10 shows a schematic structural diagram of a terminal (ie, a terminal 1000) provided by an embodiment of the present disclosure.
  • the terminal 1000 includes:
  • the first sending module 1001 is configured to send instruction information to the network side device, and the instruction information is used to indicate that the PDU session corresponding to the terminal can be transmitted using the shared tunnel.
  • the terminal 1000 can implement each process implemented by the terminal in the foregoing method embodiment, and to avoid repetition, details are not described herein again.
  • the embodiments of the present disclosure can realize multiplexing of tunnels, so as to improve the utilization rate of the tunnels, thereby reducing idleness and waste of resources.
  • FIG. 11 shows a schematic structural diagram of a network-side entity (ie, a network-side entity 1100) provided by an embodiment of the present disclosure.
  • the network side entity 1100 includes:
  • the second sending module 1101 is used to send the tunnel usage policy to the SMF entity.
  • the tunnel usage policy is used by the SMF entity to determine whether the PDU session can use shared tunnel transmission, or it is used for the SMF combined with the locally saved tunnel usage policy to determine whether the PDU session can be transmitted. Use shared tunnel transmission.
  • the network-side entity includes at least one of the following entities: a PCF entity, a UDM entity, an AMF entity, and a UPF entity.
  • the network-side entity 1100 can implement the various processes implemented by the network-side entity in the foregoing method embodiments, and to avoid repetition, details are not described herein again. In this way, compared with related technologies, the embodiments of the present disclosure can realize multiplexing of tunnels, so as to improve the utilization rate of the tunnels, thereby reducing idleness and waste of resources.
  • FIG. 12 shows a schematic structural diagram of a network side device (ie, a network side device 1200) provided by an embodiment of the present disclosure.
  • the network side device 1200 includes:
  • the establishment module 1201 is used to establish the association relationship between the protocol data unit PDU session and the allocated shared tunnel;
  • the judging module 1202 is used for judging whether there is still an associated PDU session on the shared tunnel that has not been released when the PDU session is released; when there is no associated PDU session on the shared tunnel that has not been released, trigger the first process Module 1203; otherwise, trigger the second processing module 1204;
  • the first processing module 1203 is used to release the shared tunnel
  • the second processing module 1204 is configured to maintain the shared tunnel and delete the association relationship between the released PDU session and the shared tunnel.
  • the network-side device 1200 can implement each process that can be implemented by the network-side device in the foregoing method embodiment, and to avoid repetition, details are not described herein again.
  • the embodiments of the present disclosure can realize multiplexing of tunnels, so as to improve the utilization rate of the tunnels, thereby reducing idleness and waste of resources.
  • the embodiments of the present disclosure can ensure the normal transmission of the PDU session, and can save unnecessary resource consumption and power consumption.
  • FIG. 13 shows a schematic structural diagram of another SMF entity provided by an embodiment of the present disclosure.
  • the SMF entity includes: a first processor 1301 and a first transceiver 1302; among them,
  • the first processor 1301 is configured to perform tunnel allocation according to the information of the shared tunnel when the PDU session can be transmitted using the shared tunnel.
  • the first processor 1301 is further configured to create a new ordinary tunnel when the PDU session cannot be transmitted using the shared tunnel, and allocate the newly created ordinary tunnel to the PDU session.
  • the first processor 1301 is specifically configured to implement at least one of the following:
  • the PDU session can be transmitted using a shared tunnel, and there is an established shared tunnel, assign the established shared tunnel to the PDU session;
  • the PDU session can use the shared tunnel for transmission, but there is no established shared tunnel, a new shared tunnel is created and the newly created shared tunnel is allocated to the PDU session.
  • the first processor 1301 is specifically configured to:
  • the PDU session can be transmitted using a shared tunnel and there is an established shared tunnel, according to the corresponding relationship between the tunnel selection parameters and the shared tunnel identifier, determine whether there is a target share matching the PDU session in the established shared tunnel tunnel;
  • the target shared tunnel is allocated to the PDU session.
  • the first processor 1301 is specifically configured to:
  • the tunnel selection parameters include at least one of the following parameters: user group identification parameters, slice identification parameters, DNN identification parameters, user number segment parameters, and user location parameters.
  • the first processor 1301 is further configured to:
  • the PDU session can be transmitted using a shared tunnel
  • the first tunnel usage policy stored locally by the SMF entity, the second tunnel usage policy sent by the PCF entity, and the second tunnel usage policy sent by the UDM entity are used.
  • the first processor 1301 is further configured to:
  • the shared tunnel is released; otherwise, the shared tunnel is maintained, and the association relationship between the released PDU session and the shared tunnel is deleted.
  • the association relationship is stored in RAN and UPF.
  • the SMF entity in the embodiment of the present disclosure can implement each process of the SMF entity in the foregoing method embodiment, and to avoid repetition, details are not described herein again.
  • the embodiments of the present disclosure can realize multiplexing of tunnels, so as to improve the utilization rate of the tunnels, thereby reducing idleness and waste of resources.
  • FIG. 14 shows a schematic structural diagram of another terminal provided by an embodiment of the present disclosure.
  • the terminal includes: a second processor 1401 and a second transceiver 1402; wherein,
  • the second transceiver 1402 is configured to send instruction information to the network side device, and the instruction information is used to indicate that the PDU session corresponding to the terminal can be transmitted using the shared tunnel.
  • the terminal in the embodiment of the present disclosure can implement each process implemented by the terminal in the foregoing method embodiment, and to avoid repetition, details are not described herein again.
  • the embodiments of the present disclosure can realize multiplexing of tunnels, so as to improve the utilization rate of the tunnels, thereby reducing idleness and waste of resources.
  • FIG. 15 shows a schematic structural diagram of another network-side entity provided by an embodiment of the present disclosure.
  • the network-side entity includes: a third processor 1501 and a third transceiver 1502; among them,
  • the third transceiver 1502 is used to send the tunnel usage policy to the SMF entity.
  • the tunnel usage policy is used by the SMF entity to determine whether the PDU session can use shared tunnel transmission, or the SMF entity combines the locally saved tunnel usage policy to determine whether the PDU session You can use shared tunnel transmission.
  • the network-side entity includes at least one of the following entities: a PCF entity, a UDM entity, an AMF entity, and a UPF entity.
  • the network-side entity in the embodiments of the present disclosure can implement the various processes implemented by the network-side entity in the foregoing method embodiments. To avoid repetition, details are not described herein again.
  • the embodiments of the present disclosure can realize multiplexing of tunnels, so as to improve the utilization rate of the tunnels, thereby reducing idleness and waste of resources.
  • FIG. 16 shows a schematic structural diagram of another network side device provided by an embodiment of the present disclosure.
  • the network side device includes: a fourth processor 1601 and a fourth transceiver 1602; among them,
  • the fourth processor 1601 is configured to establish an association relationship between the PDU session and the allocated shared tunnel; in the case that the PDU session is released, determine whether there is an associated PDU session on the shared tunnel that has not been released; there is no associated PDU session on the shared tunnel If the associated PDU session is not released, the shared tunnel is released; otherwise, the shared tunnel is maintained, and the association relationship between the released PDU session and the shared tunnel is deleted.
  • the network-side device can implement each process that can be implemented by the network-side device in the foregoing method embodiments. To avoid repetition, details are not described herein again.
  • the embodiments of the present disclosure can realize multiplexing of tunnels, so as to improve the utilization rate of the tunnels, thereby reducing idleness and waste of resources.
  • the embodiments of the present disclosure can ensure the normal transmission of the PDU session, and can save unnecessary resource consumption and power consumption.
  • the embodiments of the present disclosure also provide an SMF entity, including a first processor, a first memory, and a computer program stored on the first memory and capable of running on the first processor.
  • the computer program is implemented when the first processor is executed. Steps in the above-mentioned session management method on the SMF entity side.
  • the embodiments of the present disclosure also provide a terminal, including a second processor, a second memory, and a computer program stored on the second memory and capable of running on the second processor.
  • the computer program is executed by the second processor to realize the foregoing Steps in the session management method on the terminal side.
  • the embodiment of the present disclosure also provides a network-side entity, including a third processor, a third memory, and a computer program stored on the third memory and running on the third processor.
  • a network-side entity including a third processor, a third memory, and a computer program stored on the third memory and running on the third processor.
  • the embodiment of the present disclosure also provides a network side device, including a fourth processor, a fourth memory, and a computer program stored on the fourth memory and capable of running on the fourth processor.
  • a network side device including a fourth processor, a fourth memory, and a computer program stored on the fourth memory and capable of running on the fourth processor.
  • the embodiments of the present disclosure also provide a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor (which may specifically be a first processor), the steps in the session management method on the SMF entity side are implemented .
  • a processor which may specifically be a first processor
  • the embodiment of the present disclosure also provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor (which may specifically be a second processor), the steps in the above-mentioned terminal-side session management method are implemented.
  • a processor which may specifically be a second processor
  • the embodiment of the present disclosure also provides a computer-readable storage medium on which a computer program is stored.
  • a processor which may be a third processor
  • the above-mentioned network-side entity-side session management method is implemented step.
  • the embodiment of the present disclosure also provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor (which may be specifically a fourth processor), the above-mentioned network-side device-side session management method step.
  • a processor which may be specifically a fourth processor
  • the above-mentioned computer-readable media include permanent and non-permanent, removable and non-removable media, and information storage can be realized by any method or technology.
  • the information can be computer-readable instructions, data structures, program modules, or other data.
  • Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical storage, Magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media can be used to store information that can be accessed by computing devices.
  • PRAM phase change memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • RAM random access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable read-only memory
  • flash memory or other
  • the method of the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is better. ⁇
  • the technical solution of the present disclosure essentially or the part that contributes to the related technology can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk). ) Includes several instructions to make a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the method described in each embodiment of the present disclosure.
  • the embodiments described in the embodiments of the present disclosure may be implemented by hardware, software, firmware, middleware, microcode, or a combination thereof.
  • units, modules, sub-units and sub-modules can be implemented in one or more application specific integrated circuits (ASIC), digital signal processors (Digital Signal Processing, DSP), and digital signal processing equipment (DSP Device).
  • ASIC application specific integrated circuits
  • DSP digital signal processors
  • DSP Device digital signal processing equipment
  • DSPD Digital Signal Processing
  • PLD Programmable Logic Device
  • FPGA Field-Programmable Gate Array
  • general-purpose processors controllers, microcontrollers, microprocessors, and Disclosure of the described functions in other electronic units or combinations thereof.
  • the technology described in the embodiments of the present disclosure can be implemented through modules (for example, procedures, functions, etc.) that perform the functions described in the embodiments of the present disclosure.
  • the software codes can be stored in the memory and executed by the processor.
  • the memory can be implemented in the processor or external to the processor.

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Abstract

La présente invention concerne un procédé de gestion de session, une entité de fonction de gestion de session (SMF), un terminal, et une entité côté réseau. Le procédé de gestion de session est utilisé pour l'entité SMF et comprend l'étape suivante: dans le cas où une session d'unité de données de protocole (PDU) peut utiliser un tunnel partagé pour une transmission, effectuer une attribution de tunnel en fonction des informations du tunnel partagé.
PCT/CN2020/096660 2019-06-17 2020-06-17 Procédé de gestion de session, entité de fonction de gestion de session (smf), terminal, et entité côté réseau WO2020253747A1 (fr)

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