WO2021058035A1 - 一种隧道复用方法和核心网设备 - Google Patents

一种隧道复用方法和核心网设备 Download PDF

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Publication number
WO2021058035A1
WO2021058035A1 PCT/CN2020/119062 CN2020119062W WO2021058035A1 WO 2021058035 A1 WO2021058035 A1 WO 2021058035A1 CN 2020119062 W CN2020119062 W CN 2020119062W WO 2021058035 A1 WO2021058035 A1 WO 2021058035A1
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Prior art keywords
smf
public tunnel
tunnel
public
message
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PCT/CN2020/119062
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English (en)
French (fr)
Inventor
李爱华
谷群
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 WO2021058035A1 publication Critical patent/WO2021058035A1/zh

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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
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels

Definitions

  • the present disclosure relates to the field of wireless communication technology, and in particular to a tunnel multiplexing method and core network equipment.
  • 5G networks Compared with 4G networks, 5G networks have introduced a service-oriented function design to realize 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, Centralized Unit)/distributed unit (DU, Distributed Unit) separation to achieve wireless resources Centralized control and collaboration.
  • CU Centralized Unit
  • DU Distributed Unit
  • the embodiments of the present disclosure provide a tunnel multiplexing method and core network equipment.
  • the embodiment of the present disclosure provides a tunnel multiplexing method, and the method includes:
  • the first core network device Based on the obtained specific message, the first core network device initiates the establishment of a public tunnel based on the reservation mode.
  • the public tunnel based on the reservation mode is used by related terminal devices that go online after the tunnel is established; the public tunnel supports multiple Multiple terminal equipment.
  • the first core network device initiates the establishment of a public tunnel based on the reservation mode based on the obtained specific message, including:
  • the first core network device initiates the establishment of a public tunnel based on the reservation mode through the first device-level message between the core network devices; or,
  • the first core network device initiates the establishment of a public tunnel based on the reservation mode through the first user message corresponding to the terminal device.
  • the first core network device is a Session Management Function (SMF, Session Management Function); the first core network device uses a first device-level message between core network devices, Initiate the establishment of a public tunnel based on the reservation method, including:
  • SMF Session Management Function
  • SMF When SMF detects that the conditions for establishing a public tunnel are met, it initiates the establishment of a reservation-based public tunnel through the first device-level message between core network devices; or,
  • the SMF receives the first device-level message sent by the Access and Mobility Management Function (AMF, Access and Mobility Management Function), and initiates the establishment of a public tunnel based on the reservation method based on the first device-level message;
  • a device-level message includes instruction information for establishing a public tunnel based on a reservation mode; the first device-level message is sent when the AMF detects that the condition for establishing a public tunnel is satisfied.
  • the first user message is a message corresponding to any terminal device transmitted between core network devices.
  • the first core network device is an SMF; the first core network device initiates the establishment of a public tunnel based on a reservation mode through a first user message corresponding to a terminal device, including : In the information exchange process corresponding to any terminal device, the SMF initiates the establishment of a public tunnel through the first user message in the information exchange process.
  • the SMF initiates the establishment of a public tunnel through the first user message in the information exchange process, including:
  • the SMF When the SMF detects that the public tunnel establishment conditions are met, it initiates the establishment of the public tunnel through the first user message corresponding to any terminal device; or,
  • the SMF receives a first user message corresponding to any terminal device, and in the case that the first user message includes a public tunnel establishment request, initiates the establishment of a public tunnel based on a reservation mode;
  • the first user message is sent by another core network device, or by any terminal device, or by a radio access network device.
  • the first core network device is an SMF; the initiating establishment of a public tunnel based on a reservation mode includes:
  • the SMF initiates the establishment of a public tunnel based on the reservation mode based on the first policy information stored locally; or,
  • the SMF receives the second policy information sent by the Policy Control Function (PCF, Policy Control Function), and initiates the establishment of a public tunnel based on the reservation mode based on the second policy information; or,
  • PCF Policy Control Function
  • the SMF receives the subscription information sent by the unified data management function (UDM, Unified Data Management), and initiates the establishment of a public tunnel based on the reservation mode based on the subscription information.
  • UDM unified data management function
  • the method before the SMF receives the second policy information sent by the PCF, the method further includes:
  • the SMF selects the PCF based on a pre-configured manner; or, the SMF receives the instruction information sent by the AMF, and selects the PCF based on the instruction information;
  • the SMF receiving the second policy information sent by the PCF includes: the SMF performs first information interaction with the selected PCF, and obtaining the second policy information sent by the PCF based on the first information interaction.
  • the SMF receiving the subscription information sent by the UDM includes: the SMF performs a second information interaction with the UDM; and obtaining the subscription information sent by the UDM based on the second information interaction information.
  • the initiating establishment of a public tunnel based on a reservation mode includes: the SMF selects a UPF, and performs a third information interaction with the selected UPF; the third information interaction is used to exchange The first policy information, the second policy information, or the subscription information is sent to the selected UPF; the first policy information, the second policy information, or the subscription information is used for the UPF establishment and wireless The public tunnel between access network devices.
  • the method further includes: the first core network device initiates the release of the public tunnel through a second device-level message between core network devices; or,
  • the first core network device initiates the release of the public tunnel through a second user message corresponding to any terminal device.
  • the first core network device is an SMF; the first core network device initiates the release of the public tunnel through a second device-level message between core network devices, including: When the SMF detects that the public tunnel release condition is met, it instructs the UPF and radio access network equipment associated with the public tunnel to release the public tunnel through a second device-level message; the second device-level message includes a message for releasing the public tunnel. The indication information of the public tunnel.
  • the respectively instructing the UPF and the radio access network device associated with the public tunnel to release the public tunnel through the second device-level message includes:
  • the SMF instructs the UPF and the radio access network device to release the resources of the public tunnel respectively through a second device-level message
  • the SMF and AMF perform a fourth information exchange, and the fourth information exchange is used for the session management context of the synchronization PDU session release between the SMF and the AMF.
  • the first core network device is an SMF; the first core network device initiates the release of the public tunnel through a second user message corresponding to a terminal device, including: The SMF receives a second user message corresponding to any terminal device, and if the second message includes a public tunnel release request, initiates the release of the public tunnel; or,
  • the SMF When the SMF detects that the public tunnel release condition is satisfied, or the pre-saved configuration information is satisfied, the SMF initiates the release of the public tunnel through a second user message corresponding to the arbitrary terminal device.
  • the receiving of the second user message corresponding to the terminal device by the SMF includes: the SMF receiving the second user message from any terminal device; Said any terminal device sends out and arrives at said SMF via said AMF; or,
  • the SMF receives the second user message sent by the PCF; or,
  • the SMF receives the second user message sent by the AMF; or,
  • the SMF receives a second user message sent by the radio access network device; the second user message is sent by the radio access network device and arrives at the SMF via the AMF.
  • the initiating the release of the public tunnel includes: the SMF in the information exchange process corresponding to any terminal device, respectively indicating through a user message associated with the public tunnel
  • the UPF and the radio access network device release the public tunnel.
  • the method further includes:
  • the SMF and AMF perform a fifth information exchange, and the fifth information exchange is used for the session management context of the synchronization PDU session release between the SMF and the AMF.
  • the SMF detecting that the public tunnel release condition is satisfied includes: when the SMF detects that all terminal devices associated with the public tunnel are offline, starting a timer;
  • the public tunnel release condition is satisfied.
  • the public tunnel is a public tunnel corresponding to a service, a user group, a network slice, or a data network name (DNN, Data Network Name).
  • DNN Data Network Name
  • the embodiment of the present disclosure also provides a core network device, the core network device is a first core network device, and the device includes: an acquiring unit and an initiating unit; wherein,
  • the obtaining unit is configured to obtain a specific message
  • the initiating unit is configured to initiate the establishment of a public tunnel based on a reservation mode based on the specific message obtained by the acquiring unit, and the public tunnel based on the reservation mode is used by related terminal devices that go online after the tunnel establishment is completed;
  • the public tunnel supports multiplexing of multiple terminal devices.
  • the obtaining unit is configured to obtain a first device-level message between core network devices; or is configured to obtain a first user message corresponding to a terminal device;
  • the initiating unit is configured to initiate the establishment of a public tunnel based on the reservation mode through the first device-level message obtained by the obtaining unit; or is configured to initiate the establishment of a public tunnel based on the first user message obtained through the obtaining unit Reserved public tunnels.
  • the first core network device is an SMF; the initiating unit is configured to pass a first device-level message between core network devices when it detects that the conditions for establishing a public tunnel are met Initiate the establishment of a public tunnel based on the reservation mode; or, receive the first device-level message sent by AMF, and initiate the establishment of a public tunnel based on the reservation method based on the first device-level message; wherein, in the first device-level message It includes instruction information for establishing a public tunnel based on a reservation mode; the first device-level message is sent when the AMF detects that the condition for establishing a public tunnel is satisfied.
  • the first user message is a message corresponding to any terminal device transmitted between core network devices.
  • the first core network device is an SMF; the initiating unit is configured to pass through the first user in the information exchange process during the information exchange process corresponding to any terminal device The message initiates the establishment of a public tunnel.
  • the initiating unit is configured to initiate the establishment of a public tunnel through a first user message corresponding to any terminal device when it detects that a public tunnel establishment condition is met; or,
  • the device further includes a communication unit configured to receive a first user message corresponding to any terminal device;
  • the initiating unit is configured to initiate the establishment of a public tunnel based on a reservation mode when the first user message received by the communication unit includes a public tunnel establishment request; wherein, the first user message is It is sent by other core network equipment, or sent by any terminal equipment, or sent by the wireless access network equipment.
  • the device further includes a storage unit or a communication unit;
  • the storage unit is configured to store first policy information
  • the communication unit is configured to receive second policy information sent by PCF; or, receive subscription information sent by UDM;
  • the initiating unit is configured to initiate the establishment of a reservation-based public tunnel based on the first policy information stored by the storage unit; or, initiate the establishment of a reservation-based public tunnel based on the second policy information received by the communication unit Or, initiate the establishment of a public tunnel based on the reservation method based on the subscription information received by the communication unit.
  • the device further includes a first selection unit configured to select the PCF based on a pre-configured manner before the communication unit receives the second policy information sent by the PCF; or,
  • the communication unit is further configured to receive instruction information sent by AMF;
  • the selection unit is configured to select a PCF based on the instruction information received by the communication unit;
  • the communication unit is further configured to perform first information interaction with the PCF selected by the first selection unit, and obtain the second policy information sent by the PCF based on the first information interaction.
  • the communication unit is configured to perform a second information interaction with the UDM; and obtain the subscription information sent by the UDM based on the second information interaction.
  • the device further includes a second selection unit configured to select UPF
  • the initiation unit is configured to perform a third information interaction with the UPF selected by the second selection unit through the communication unit; the third information interaction is used to combine the first policy information and the second policy information Or the subscription information is sent to the selected UPF; the first policy information, the second policy information, or the subscription information is used for the UPF to establish the public tunnel with the radio access network device.
  • the device further includes a release unit configured to initiate the release of the public tunnel through a second device-level message between core network devices; or, through a device corresponding to any terminal device The second user message initiates the release of the public tunnel.
  • the first core network device is an SMF; the release unit is configured to, when detecting that the public tunnel release condition is met, indicate through a second device-level message that the public tunnel is associated The UPF and the radio access network device release the public tunnel; the second device-level message includes instruction information for releasing the public tunnel.
  • the release unit is configured to instruct the UPF and the radio access network device to release the resources of the common tunnel through a second device-level message; and is also configured to perform fourth information with AMF Interaction, the fourth information exchange is used for the session management context released by the SMF and the AMF synchronization PDU session.
  • the first core network device is an SMF; the device further includes a communication unit configured to receive a second user message corresponding to any terminal device;
  • the releasing unit is configured to initiate the release of the public tunnel when the second message received by the communication unit includes a public tunnel release request; or, it is detected that the public tunnel release condition is met, or the pre-existing In the case of the saved configuration information, the release of the public tunnel is initiated through a second user message corresponding to the arbitrary terminal device.
  • the communication unit is configured to receive a second user message from any terminal device; the second user message is sent by the arbitrary terminal device and arrives at the AMF via the AMF.
  • SMF receive a second user message sent by PCF; or, receive a second user message sent by AMF; or, receive a second user message sent by a radio access network device; the second user message is sent by the radio
  • the network access device sends out and arrives at the SMF via the AMF.
  • the releasing unit is configured to indicate respectively the UPF and radio access network equipment associated with the public tunnel through a user message during the information exchange process corresponding to any terminal device Release the public tunnel.
  • the communication unit when the second user message is sent by a terminal device, a PCF, or a wireless access network device, the communication unit is further configured to communicate with the AMF for the fifth message. Interaction, the fifth information exchange is used for the session management context released by the SMF and the AMF synchronization PDU session.
  • the releasing unit is configured to start a timer when it detects that all terminal devices associated with the public tunnel are offline; before the timing of the timer expires , When it is determined that no terminal device uses the public tunnel, initiate the release of the public tunnel.
  • the public tunnel is a public tunnel corresponding to a service, a user group, a network slice, or a DNN.
  • 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, the steps of the method described in the embodiment of the present disclosure are implemented.
  • the embodiment of the present disclosure also provides a core network device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor.
  • a core network device including a memory, a processor, and a computer program stored in the memory and capable of running on the processor.
  • the processor executes the program, the implementation described in the embodiment of the present disclosure Method steps.
  • the tunnel multiplexing method and communication device include: the first core network device initiates the establishment of a public tunnel based on the reservation mode based on the obtained specific message, and the public tunnel based on the reservation mode is used It is used by related terminal devices that go online after the tunnel is established; the public tunnel supports multiplexing of multiple terminal devices.
  • the multiplexing of the tunnel is realized by initiating the establishment of a public tunnel based on the reservation mode, which avoids the consumption of signaling resources caused by the repeated establishment and deletion of the tunnel, thereby improving resource utilization Rate, reduce 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 first schematic flowchart of a tunnel multiplexing method according to an embodiment of the disclosure
  • FIG. 4 is a second schematic flowchart of the tunnel multiplexing method according to an embodiment of the disclosure.
  • FIG. 5 is a third schematic flowchart of a tunnel multiplexing method according to an embodiment of the disclosure.
  • FIG. 6 is a fourth flowchart of a tunnel multiplexing method according to an embodiment of the disclosure.
  • FIG. 7 is a fifth schematic flowchart of a tunnel multiplexing method according to an embodiment of the disclosure.
  • FIG. 8 is a schematic diagram 1 of the composition structure of a core network device according to an embodiment of the disclosure.
  • FIG. 9 is a second schematic diagram of the composition structure of a core network device according to an embodiment of the disclosure.
  • FIG. 10 is a third schematic diagram of the composition structure of a core network device according to an embodiment of the disclosure.
  • FIG. 11 is a fourth schematic diagram of the composition structure of a core network device according to an embodiment of the disclosure.
  • FIG. 12 is a schematic diagram 5 of the composition structure of the core network device according to the embodiment of the disclosure.
  • FIG. 13 is a schematic diagram of the hardware composition structure of a core network device according to an embodiment of the disclosure.
  • FIG. 1 is a diagram of the 5G network architecture.
  • the 5G network architecture mainly includes an authentication service function (AUSF, Authentication Server Function) entity, a network slice selection function (NSSF, Network Slice Selection Function) entity, and a policy control function.
  • AUSF authentication service function
  • NSSF Network Slice Selection Function
  • PCF Policy Control Function
  • NEF Network element data warehouse function
  • AMF Access and Mobility Management Function
  • SMF Session Management Function
  • UDM Unified Data Management
  • UPF User Plane Function
  • the initial service requirements are: AMF, SMF, PCF, AUSF, UDM , NSSF, etc., NEF, UDR, UPF are not currently required to be servicing.
  • SMF can correspond to part of the functions of the control plane service gateway (SGW-C, Serving Gateway-C) and the control plane packet data network gateway (PGW-C, Packet data network Gateway-C) in the 4G network.
  • SMF is responsible for 5G users’ Session life cycle management, IP address allocation, data routing, business continuity management, policy rule matching, and traffic accounting processing functions.
  • the related functions of session management that SMF should support can include:
  • PDU Protocol Data Unit
  • IPv4 Internet Protocol version 4
  • IPv6 Internet Protocol version 6
  • Ethernet Ethernet and unstructured PDU session types
  • the subscription type can include allowed and default PDU session types, allowed and default session and service continuity (SSC, Session and Service Continuity) ) Mode, Quality of Service (QoS, Quality of Service) 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 control observation points
  • PDU Session ID PDU Session ID
  • P-CSCF Proxy-Call Session Control Function
  • 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 (DHCP, Dynamic Host Configuration Protocol) v4/DHCPv6, etc. from the external network Obtain the user's 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 strategy, data network name (DNN, Data Network Name), and application layer function (AF, Application Function) strategy. To support the upstream traffic offloading function of PDU sessions, SMF should support:
  • SMF should support the following:
  • SMF should also support other data routing functions, mainly including the following six:
  • SMF supports sending notification directly to AF
  • LADN Local Area Data Network
  • 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 Then the session establishment request is rejected.
  • SMF should support the following functions:
  • SMF first triggers the release of the current session, and then notifies the UE to establish a new session connected to the same data network (DN, Data Network);
  • SMF should support the following functions:
  • SMF first informs 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 can also create new anchor points
  • SMF should support local configuration and receive policy control related functions issued by PCF, which mainly include the following five items:
  • Support service flow detection function according to the data service flow template in the policy and charging control rules (PCC, Policy and Charging Control) rules to identify the upstream and downstream service flows;
  • PCC Policy and Charging Control
  • Support ADC function realize business detection and control function, support the installation, modification and deletion of PCC rules containing TDF-Application-Identifier, so as to realize the reporting of business data start and end events, and follow the strategy The action defined by the rule.
  • 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 be sent to the charging gateway. At the same time, the SMF should support the charging suspension function.
  • FIG. 2 is a flow chart of session establishment in the related art. It should be noted that Fig. 2 is for the scenario where the UE has been registered on the AMF. 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 related technologies includes:
  • Step 101 The UE sends a NAS message (S-NSSAI(s), DNN, PDU session ID, request type, old PDU session ID, N1SM container) to the AMF.
  • the N1SM container carries a PDU session establishment request.
  • Step 102 The 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.
  • Step 103 AMF sends a context request (also called Nsmf_PDUSession_CreateSMContext Request) message for SMF to create PDU session management to SMF.
  • the message carries user-related information, such as user location information (ULI, User Location Information), subscription to PDU session status notification , DNN selection mode, etc.
  • Step 104 SMF and UDM exchange session management subscription data for subscription retrieval/subscription update.
  • Step 105 The SMF sends a context response (also referred to as Nsmf_PDUSession_CreateSMContext Response) message for SMF creation PDU session management to the AMF, and the message carries the reason value and the SM context, etc.
  • a context response also referred to as Nsmf_PDUSession_CreateSMContext Response
  • Step 106 PDU session verification/authorization during the initial establishment of the PDU session.
  • Step 107a to step 107b SMF performs PCF selection. If you want to use dynamic PCC for PDU sessions, SMF can select PCF according to AMF instructions or local configuration; otherwise, SMF can apply local policies; SMF can perform the session management (SM, Session Management) policy association establishment process to establish SM with PCF Policy association, and obtain the default PCC rules for the PDU session; or, the SMF can initiate the SM policy association modification.
  • SMF session management
  • Step 108 The SMF selects the UPF according to the location of the UPF, DNN, weight information, etc. If the PCC rule is not required as the input of the UPF selection, step 107 can be executed after step 108.
  • Step 109 The SMF can execute the SM policy association modification process initiated by the SMF to provide information about the policy control request trigger condition that has been met; if the request type is "initial request", dynamic PCC is deployed, and the PDU session type is IPv4, IPv6 or IPv4v6, the SMF will use the assigned UE IP address/prefix to notify the PCF (if the policy control request trigger condition is met).
  • Steps 110a to 110b SMF sends an N4 session establishment/modification request to UPF, and UPF sends an N4 session establishment/modification response to SMF, and cooperates with UPF to allocate core network channel information (ie CN Tunnel Info).
  • core network channel information ie CN Tunnel Info
  • Step 111 The SMF sends a transmission message for N1N2 communication (also referred to as Namf_Communication_N1N2Message Transfer message) to the AMF, and informs the AMF of CN Tunnel Info related information.
  • N1N2 communication also referred to as Namf_Communication_N1N2Message Transfer message
  • Step 112 The AMF sends a NAS message (NAS msg) to the radio access network (RAN, Radio Access Network), including the N2PDU session request, and carrying the CN Tunnel Info obtained from the SMF.
  • NAS msg NAS message
  • RAN Radio Access Network
  • Step 113 A special resource access procedure is initiated between the RAN and the UE, carrying a PDU session establishment acceptance message; the RAN allocates access network channel information ((AN, Access Network) Tunnel Info) for the UE, and the PDU session is successfully established.
  • access network channel information ((AN, Access Network) Tunnel Info
  • Step 114 The RAN responds to the N2PDU session response message to the AMF, carrying the reason value and AN Tunnel Info, etc.
  • Step 115 AMF sends a context request for SMF update PDU session management to SMF (it can also be called Nsmf_PDUSession_UpdateSMContext request, which carries SM context ID, N2 SM information, request type), and AMF will receive N2 SM information (carrying AN Tunnel Info, etc.) are forwarded to SMF.
  • SMF SMF update PDU session management
  • Nsmf_PDUSession_UpdateSMContext request which carries SM context ID, N2 SM information, request type
  • Step 116a to step 116c SMF sends an N4 session modification request to UPF; UPF sends an N4 session modification response to SMF; SMF provides tunnel information and corresponding forwarding rules to UPF. SMF and UDM exchange information and complete registration.
  • Step 117 The SMF sends an SMF update PDU session management context response (which may also be recorded as Nsmf_PDUSession_UpdateSMContext Response) message to the AMF to the AMF, carrying the reason value.
  • PDU session management context response (which may also be recorded as Nsmf_PDUSession_UpdateSMContext Response) message
  • Step 118 SMF sends SMF PDU session management context status notification to AMF.
  • Step 119 SMF performs IPv6 address configuration.
  • Step 120 SMF and UDM exchange information and cancel the subscription.
  • the session establishment is usually completed when the user attaches; in the 5G core network, the current mechanism is that the user requests the establishment of the PDU session.
  • M megabyte
  • the application scenarios of the embodiments of the present disclosure include but are not limited to the low-frequency small packet business scenario of the Internet of Things.
  • FIG. 3 is a schematic flowchart 1 of a tunnel multiplexing method according to an embodiment of the disclosure; as shown in FIG. 3, the method includes:
  • Step 201 Based on the obtained specific message, the first core network device initiates the establishment of a public tunnel based on the reservation mode, and the public tunnel based on the reservation mode is used by related terminal devices that go online after the tunnel is established;
  • the tunnel supports multiple terminal equipment multiplexing.
  • a public tunnel can be understood as a tunnel that can support multiple terminal devices in a shared manner, and it is not a tunnel specifically established for a certain PDU session.
  • the public tunnel is a public tunnel corresponding to a service, a user group (UE group), a network slice, or a data network name (DNN).
  • the public tunnel may be a public tunnel dedicated to a certain service, or a public tunnel used by users in a certain user group, or a public tunnel dedicated to a certain network slice, or a certain data network name. (DNN) public tunnel.
  • DNN data network name
  • the embodiments of the present disclosure are not limited to this, and the public tunnel may also be a public tunnel corresponding to a specific area, or a public tunnel corresponding to a specific number segment. It can be understood that according to different user groups, different services, different network slices, different DNNs, even different number segments, and different locations, different tunnels can be used to transmit PDU sessions.
  • the first core network may specifically be an SMF, that is, the SMF initiates the establishment of a public tunnel based on a reservation mode. Among them, SMF initiates the establishment of a public tunnel based on the reservation method based on the specific message obtained.
  • the specific message may be sent by other core network equipment, or may be sent by any terminal equipment.
  • the public tunnel is established based on the reservation mode before the service requirement. It can be understood that the establishment of the public tunnel in this embodiment has nothing to do with user behavior.
  • the public tunnel is established in the reserved mode to realize the multiplexing of multiple terminal devices. For example, even if no terminal is online, the reserved public tunnel will always be reserved; after a terminal device goes online, use the reserved public tunnel for data transmission; when another terminal device goes online, the reserved public tunnel can also be used.
  • the public tunnel in the reserved mode is used for data transmission; after the last terminal device of the public tunnel in the reserved mode goes offline, the public tunnel in the reserved mode is still reserved. This avoids the consumption of signaling resources caused by repeated establishment and deletion of tunnels, thereby providing effective tunnel management and improving resource utilization.
  • the first core network device initiates the establishment of a public tunnel based on a reservation method based on the obtained specific message, including: the first core network device passes through the first core network device between the core network devices.
  • a device-level message initiates the establishment of a public tunnel based on the reservation mode; or, the first core network device initiates the establishment of a public tunnel based on the reservation mode through a first user message corresponding to the terminal device.
  • the first user message is a message corresponding to any terminal device transmitted between core network devices.
  • the first core network device may initiate the establishment of a public tunnel based on the reservation mode through a device-level message.
  • the device-level message is to initiate the establishment of a public tunnel based on the reservation mode through message interaction between core network devices. It can be understood that when the conditions for establishing a public tunnel are met, a certain core network device (the core network device may be the first core network device itself or other core network devices) initiates the establishment of a public tunnel, and all The first core network device establishes a public tunnel based on the reservation mode through information exchange between the core network devices.
  • the first core network device may also initiate the establishment of a public tunnel based on the reservation mode in a manner corresponding to a user message of any terminal device.
  • the user message corresponding to any terminal device is a message for information interaction between any terminal device and a network side device. For example, if a terminal device initiates session establishment, any user message in the session establishment process corresponding to the terminal device may carry a request for establishing the public tunnel, and the arbitrary user message may be used by the terminal in the session establishment process.
  • the user message sent by the device can also be the user message sent by other network devices (such as wireless access network equipment or core network equipment) in the session establishment process, that is, on the basis of the existing user messages of any terminal device,
  • other network devices such as wireless access network equipment or core network equipment
  • information for requesting the establishment of a public tunnel based on the reservation mode is added to the existing user message; after obtaining the information, the first core network device establishes the public tunnel based on the reservation mode.
  • the first core network device initiates the establishment of reservation-based
  • the public tunnel in this way includes: in the information exchange process corresponding to any terminal device, the SMF initiates the establishment of the public tunnel through the first user message in the information exchange process.
  • the SMF initiates the establishment of a public tunnel through the first user message in the information exchange process, including: when the SMF detects that the public tunnel establishment conditions are met, initiates the establishment of the public tunnel through a first user message corresponding to any terminal device Establish a public tunnel; or, the SMF receives a first user message corresponding to any terminal device, and in the case that the first user message includes a public tunnel establishment request, initiates the establishment of a public tunnel based on the reservation mode; wherein , The first user message is sent by another core network device, or by any terminal device, or by a radio access network device.
  • the SMF may initiate the establishment of a public tunnel based on the reservation mode through the first user message corresponding to any terminal device when it detects that the public tunnel establishment conditions are met; or it may be initiated by other core network devices or any terminal device.
  • the device or the radio access network device initiates the establishment of a public tunnel based on the reservation mode through the first user message.
  • the initiator of the public tunnel based on the reservation mode may be SMF, or other core network equipment (such as AMF) other than SMF, or any terminal equipment, or radio access network equipment.
  • the initiating the establishment of a public tunnel based on the reservation method includes: the SMF initiates the establishment of the public tunnel based on the reservation method based on the first policy information stored locally; or The SMF receives the second policy information sent by the PCF, and initiates the establishment of a public tunnel based on the reservation method based on the second policy information; or, the SMF receives the subscription information sent by the UDM, and initiates the establishment based on the reservation based on the subscription information. Way to the public tunnel.
  • the SMF establishes a public tunnel based on the reservation method.
  • the tunnel multiplexing strategy can be determined through three methods: (A) SMF local configuration, (B) PCF policy issuance, and (C) UDM subscription information issuance.
  • the first policy information may be locally configured in the SMF in advance, so that the SMF stores the first policy information this time.
  • the second policy information can be obtained from the PCF, or the subscription information can be obtained from the UDM.
  • the SMF can establish a public tunnel based on the reservation mode based on the above-mentioned first policy information, second policy information or subscription information.
  • the content in the first policy information, the second policy information or the subscription information may include whether the terminal device can use a public tunnel for data transmission.
  • the SMF sends information related to the establishment of a public tunnel to the selected UPF, and on the other hand, it sends information related to the establishment of a public tunnel to the radio access network device to establish a connection between the UPF and the radio access network device.
  • Public tunnel based on reservation mode.
  • the information related to the establishment of a public tunnel may include a tunnel identifier (tunnel ID), a peer IP address, and so on.
  • the method further includes: the SMF selects the PCF based on a pre-configured manner; or, the SMF receives the instruction information sent by the AMF based on the instruction information Select the PCF; correspondingly, the SMF receiving the second policy information sent by the PCF includes: the SMF performs first information interaction with the selected PCF, and obtains the second information sent by the PCF based on the first information interaction Strategy information.
  • the SMF receiving the subscription information sent by the UDM includes: the SMF performs a second information interaction with the UDM; and obtaining the subscription information sent by the UDM based on the second information interaction.
  • the embodiment of the present disclosure also discloses a technical solution for initiating the release of the public tunnel.
  • the device can be used in this embodiment A level message or a user message initiates the release of the public tunnel.
  • the method further includes: the first core network device initiates the release of the public tunnel through a second device-level message between core network devices; or The core network device initiates the release of the public tunnel through a second user message corresponding to any terminal device.
  • the second user message is a user message transmitted between core network devices and corresponding to any terminal device.
  • the release of the public tunnel may also be initiated through a device-level message or a user message.
  • the first core network device may initiate the release of the public tunnel through a second device-level message. It can be understood that when the public tunnel release conditions are met, a certain core network device (the core network device may be the first core network device itself or other core network devices) initiates the release of the public tunnel, The first core network device releases the public tunnel through information exchange between core network devices.
  • the first core network device may also initiate the release of the public tunnel in a manner corresponding to a second user message of any terminal device. That is, on the basis of the existing user message of any terminal device, the information used to request the release of the public tunnel is added to the existing user message in a "free-riding" manner.
  • the first core network device initiates the release of the public tunnel through a second device-level message between core network devices, including: the SMF detects that the public tunnel release is satisfied When conditions are met, a second device-level message is used to instruct the UPF and radio access network devices associated with the public tunnel to release the public tunnel respectively; the second device-level message includes instruction information for releasing the public tunnel.
  • instructing the UPF and radio access network devices associated with the public tunnel to release the public tunnel through the second device-level message respectively includes: the SMF instructs the UPF and wireless access through the second device-level message, respectively
  • the network equipment releases the resources of the public tunnel; the SMF and AMF perform a fourth information exchange, and the fourth information exchange is used for the session management context of the synchronization PDU session release between the SMF and the AMF.
  • the first core network device initiates the release of the public tunnel through a second user message corresponding to the terminal device, including: the SMF receives a message corresponding to any terminal device The second user message, if the second message includes a public tunnel release request, initiate the release of the public tunnel; or, the SMF detects that the public tunnel release conditions are met, or the pre-saved configuration information is met Next, the release of the public tunnel is initiated through a second user message corresponding to the arbitrary terminal device.
  • receiving the second user message corresponding to the terminal device by the SMF includes: the SMF receives the second user message from any terminal device; the second user message is sent by the arbitrary terminal device through the AMF arrives at the SMF; or, the SMF receives the second user message sent by the PCF; or, the SMF receives the second user message sent by the AMF; or, the SMF receives the second user message sent by the radio access network device Message; The second user message is sent by the radio access network device and arrives at the SMF via the AMF.
  • the initiating release of the public tunnel includes: the SMF in the information exchange process corresponding to any terminal device, through a user message, respectively instructing the UPF and the radio access network device associated with the public tunnel to release the location.
  • the public tunnel includes: the SMF in the information exchange process corresponding to any terminal device, through a user message, respectively instructing the UPF and the radio access network device associated with the public tunnel to release the location.
  • the SMF detecting that the public tunnel release condition is satisfied includes: when the SMF detects that all terminal devices associated with the public tunnel are offline, starting a timer; Before the timing time expires, if it is determined that no terminal device uses the public tunnel, the public tunnel release condition is satisfied.
  • the timing duration of the timer in this embodiment can be determined in a pre-appointed manner, or manually configured, or configured by other network equipment. Wherein, the timing duration of the timer may be a specific duration or infinity, which means that the corresponding public tunnel will never be deleted.
  • SMF detects that all terminal devices on the public tunnel are offline (that is, no terminal device uses the public tunnel)
  • the timer is started; if there is a terminal device before the timer expires Go online, the timer is cleared and the timer is closed; if no other terminal equipment goes online before the timer's timing time expires, it is determined that the public tunnel release condition is met, and the above-mentioned equipment level can be used Release the public tunnel in a message or user message.
  • the method when the second user message is sent by a terminal device, a PCF, or a radio access network device, the method further includes: the SMF and AMF perform the first Five information exchange.
  • the fifth information exchange is used for the session management context released by the SMF and the AMF synchronization PDU session.
  • the core network device initiates the establishment of a public tunnel based on the reservation mode to realize the multiplexing of the tunnel, and the online/offline of the terminal device establishes or releases the public tunnel based on the reservation mode.
  • the reserved public tunnel is released only when the above-mentioned public tunnel release conditions are met, which avoids the consumption of signaling resources caused by repeated establishment and deletion of tunnels, thereby improving resource utilization , To reduce the idleness and waste of resources.
  • the embodiments of the present disclosure include the following two examples:
  • FIG. 4 is a second schematic flowchart of the tunnel multiplexing method according to an embodiment of the disclosure.
  • a user message corresponding to any terminal device is used to initiate the establishment of a public tunnel based on the reservation method.
  • the user message in this embodiment is a user message used by any terminal device in the interactive process of initiating the establishment of a PDU session.
  • the method includes:
  • Step 301 The UE sends a PDU session establishment request to the AMF;
  • Step 302 AMF performs SMF selection
  • Step 303 AMF sends a context request (also referred to as Nsmf_PDUSession_CreateSMContext Request) message for SMF creation PDU session management to SMF;
  • a context request also referred to as Nsmf_PDUSession_CreateSMContext Request
  • Step 304 SMF and UDM exchange session management subscription data for subscription retrieval/subscription update
  • Step 305 SMF sends a context response (also referred to as Nsmf_PDUSession_CreateSMContext Response) message for SMF creation PDU session management to AMF;
  • a context response also referred to as Nsmf_PDUSession_CreateSMContext Response
  • Step 306 PDU session verification/authorization during the initial establishment of the PDU session.
  • Steps 307a to 307b SMF performs PCF selection; SMF can perform the SM policy association establishment process, or the SMF can initiate SM policy association modification;
  • Step 308 SMF selects UPF; among them, SMF can select UPF according to the location of UPF, DNN, weight information, etc.;
  • Step 309 The SMF can execute the SM policy association modification process initiated by the SMF;
  • Step 310a to step 310b SMF sends an N4 session establishment/modification request to UPF, and UPF sends an N4 session establishment/modification response to SMF;
  • Step 311 The SMF sends a transfer message for N1N2 communication (also called Namf_Communication_N1N2Message Transfer message) to the AMF;
  • N1N2 communication also called Namf_Communication_N1N2Message Transfer message
  • Step 312 AMF sends an N2PDU session request to the RAN, carrying a NAS message (NAS msg);
  • Step 313 A special resource access procedure is initiated between the RAN and the UE, carrying a PDU session establishment acceptance message; the RAN allocates AN Tunnel Info to the UE, and the PDU session is successfully established;
  • Step 314 The RAN responds to the N2PDU session response message to the AMF, carrying the reason value and AN Tunnel Info, etc.;
  • Step 315 AMF sends a context request for SMF update PDU session management to SMF (it can also be called Nsmf_PDUSession_UpdateSMContext request, which carries SM context ID, N2 SM information, request type), AMF will receive N2 SM information (carrying AN Tunnel Info, etc.) are forwarded to SMF;
  • Nsmf_PDUSession_UpdateSMContext request which carries SM context ID, N2 SM information, request type
  • Steps 316a to 316c SMF sends an N4 session modification request to UPF; UPF sends an N4 session modification response to SMF; SMF provides tunnel information and corresponding forwarding rules to UPF. SMF and UDM exchange information and complete registration;
  • Step 317 The SMF sends an SMF update PDU session management context response (which may also be recorded as Nsmf_PDUSession_UpdateSMContext Response) message to the AMF to the AMF;
  • SMF update PDU session management context response (which may also be recorded as Nsmf_PDUSession_UpdateSMContext Response) message to the AMF to the AMF;
  • Step 318 SMF sends SMF PDU session management context status notification to AMF;
  • Step 319 SMF performs IPv6 address configuration
  • Step 320 SMF and UDM exchange information and cancel the subscription.
  • step 101 For the detailed description of step 101 to step 120 in the foregoing FIG. 2, which will not be repeated here.
  • the PDU session The establishment request carries related information for requesting the establishment of a public tunnel based on the reservation mode.
  • the PDU session establishment request may carry tunnel multiplexing information.
  • the message sent by the AMF to the SMF carries a request to establish a reservation based on the tunnel.
  • Information about the public tunnel for example, can carry tunnel multiplexing information.
  • the SMF can determine the tunnel multiplexing strategy based on (A) SMF local configuration, (B) PCF policy issuance, and (C) UDM contract issuance.
  • SMF interacts with UDM to obtain subscription information.
  • the subscription information may include user group identification and information on using public tunnels, corresponding to the way of issuing UDM subscription under Condition C.
  • SMF can locally configure relevant information for tunnel multiplexing, corresponding to condition A based on SMF local configuration.
  • the SMF selects the PCF according to the instructions of the AMF or the local configuration.
  • the PCF can issue related policies, including user group messages, and whether to use a shared tunnel, corresponding to the way of issuing the PCF policy of condition B.
  • step 311 the SMF interacts the related information of the public tunnel with the AMF, and decides whether to establish a public tunnel based on the reservation mode based on the three granularities of the above conditions A ⁇ B ⁇ C.
  • step 313 the RAN allocates AN Tunnel info and brings it to the UE.
  • step 314 the RAN sends AN Tunnel info to the AMF.
  • step 315 and step 316a AMF forwards AN Tunnel info to SMF, and SMF forwards to UPF.
  • FIG. 5 is a third schematic flowchart of the tunnel multiplexing method according to an embodiment of the disclosure. This example uses a method corresponding to a device-level message to initiate the establishment of a public tunnel based on the reservation method. As shown in Figure 5, the method includes:
  • Step 401 AMF performs SMF selection
  • Step 402 AMF sends a context request (also referred to as Nsmf_PDUSession_CreateSMContext Request) message for SMF creation PDU session management to SMF;
  • a context request also referred to as Nsmf_PDUSession_CreateSMContext Request
  • Step 403 The SMF sends a context response (also referred to as Nsmf_PDUSession_CreateSMContext Response) message for SMF creation PDU session management to the AMF;
  • a context response also referred to as Nsmf_PDUSession_CreateSMContext Response
  • Step 404a to step 404b SMF performs PCF selection; SMF can initiate SM policy association modification;
  • Step 405 SMF selects UPF
  • Step 406 The SMF can execute the SM policy association modification process initiated by the SMF;
  • Step 407a to step 407b SMF sends an N4 session establishment/modification request to UPF, and UPF sends an N4 session establishment/modification response to SMF;
  • Step 408 The SMF sends a transfer message for N1N2 communication (also called Namf_Communication_N1N2Message Transfer message) to the AMF;
  • N1N2 communication also called Namf_Communication_N1N2Message Transfer message
  • Step 409 AMF sends an N2PDU session request to the RAN, carrying a NAS message (NAS msg);
  • Step 410 The RAN sends an N2PDU session response to the AMF;
  • Step 411 AMF sends a context request for SMF update PDU session management to SMF (which may also be referred to as Nsmf_PDUSession_UpdateSMContext request);
  • Steps 412a to 412b SMF sends an N4 session modification request to UPF; UPF sends an N4 session modification response to SMF;
  • Step 413 The SMF sends an SMF update PDU session management context response (which can also be recorded as Nsmf_PDUSession_UpdateSMContext Response) message to the AMF to the AMF;
  • SMF update PDU session management context response (which can also be recorded as Nsmf_PDUSession_UpdateSMContext Response) message to the AMF to the AMF;
  • Step 414 The SMF sends an SMF PDU session management context status notification to the AMF.
  • the core network device may initiate the establishment of a public tunnel based on the reservation mode.
  • AMF initiates the establishment of a public tunnel based on the reservation mode
  • step 401 AMF detects that the public tunnel establishment conditions are met, and actively initiates the establishment of a public tunnel based on the reservation mode, and selects SMF.
  • step 402 the message sent by the AMF to the SMF carries the relevant information for establishing a public tunnel based on the reservation mode.
  • SMF initiates the establishment of a public tunnel based on the reservation method
  • SMF can also detect that the public tunnel establishment conditions are met, and actively initiate the establishment of a public tunnel based on the reservation method, and select UPF, that is, skip step 401 to step 404, directly execute step 405.
  • the SMF can determine the tunnel multiplexing strategy based on (A) SMF local configuration, (B) PCF policy issuance, and (C) UDM contract issuance.
  • the SMF can determine the correspondence between the user (that is, the terminal device that is to use the public tunnel) and the public tunnel according to the local configuration mode (corresponding condition A), and in the subsequent message Pass this correspondence to RAN and UPF.
  • the SMF selects the PCF according to the instructions of the AMF or the local configuration.
  • the PCF can issue related policies, including user group messages, and what kind of shared tunnel is used (for example, what kind of service the public tunnel corresponds to) Public tunnel, or public tunnel for which user group corresponds to a public tunnel, etc.), corresponding to the way the PCF policy of condition B is issued.
  • step 407 SMF and UPF exchange information related to the establishment of a public tunnel, and exchange subscription information.
  • step 410 the RAN sends AN Tunnel info to the AMF.
  • step 411 and step 412a AMF forwards AN Tunnel info to SMF, and SMF forwards to UPF.
  • the embodiments of the present disclosure include the following two examples:
  • FIG. 6 is a fourth flowchart of a tunnel multiplexing method according to an embodiment of the disclosure. This example uses the method corresponding to the device-level message to initiate the release of the public tunnel. As shown in Figure 6, the method includes:
  • Steps 501a to 501b SMF sends N4 Session Release Request to UPF; UPF sends N4 Session Release Response to SMF;
  • Step 502 N1N2 communication message transmission (Nsmf Communication N1N2 Message Transfer) message is performed between SMF and AMF;
  • Step 503 AMF sends an N2 resource release request (N2 Release Request) to the RAN;
  • Step 504 The RAN performs an access specific resource modification (AN specific resource modification) to the UE, including a PDU Session Release Command (PDU Session Release Command);
  • PDU Session Release Command PDU Session Release Command
  • Step 505 The RAN sends an N2 resource release acknowledgement (N2 Release ACK) to the AMF;
  • Step 506a to step 506b AMF sends an update PDU session management context N2 session management message (Nsmf PDU Session UpdateSMContext N2 SM info) to the SMF, and obtains an SMF response PDU session management context message (Nsmf PDU Session UpdateSMContext Response);
  • Nsmf PDU Session UpdateSMContext Response Nsmf PDU Session UpdateSMContext Response
  • Step 507 The UE sends a PDU Session Release Acknowledge (PDU Session Release ACK) to the RAN;
  • Step 508 The RAN sends an N2 resource release acknowledgement (N2 Release ACK) to the AMF;
  • Step 509a to step 509b AMF sends an update PDU session management context N1 session management message (Nsmf PDU Session UpdateSMContext N1SM info) to the SMF, and obtains an SMF response PDU session management context message (Nsmf PDU Session UpdateSMContext Response);
  • Nsmf PDU Session UpdateSMContext Response Nsmf PDU Session UpdateSMContext Response
  • Step 510 AMF and SMF exchange PDU session management context status notification (release status) (Nsmf_PDUSession_SMContextStatusNotify (Release)); wherein the notification message needs to carry the SMF identifier (SMF ID), PDU session identifier, DNN and S-NSSAI;
  • release status PDU session management context status notification
  • Nsmf_PDUSession_SMContextStatusNotify Release
  • Step 511 SMF and PCF exchange information to terminate the session management policy association (SM Policy Association Termination).
  • the core network device can initiate the release of the public tunnel established based on the reservation mode.
  • the SMF initiates the release of the public tunnel established based on the reservation as an example.
  • this embodiment is not limited to this, and other core network equipment (for example, AMF) may also initiate the release of the public tunnel established based on the reservation.
  • FIG. 7 is a fifth schematic flowchart of a tunnel multiplexing method according to an embodiment of the disclosure.
  • a user message corresponding to any terminal device is used to initiate the release of a public tunnel based on the reservation mode.
  • the user message in this embodiment is a user message used by any terminal device in the interactive process of initiating the release of the PDU session.
  • the method includes:
  • Steps 601a to 601e respectively initiate public tunnel release by the UE, PCF, AMF, RAN and SMF; among them, step 601a indicates that the PDU session release request message sent by the UE carries the public tunnel release information, and the PDU session release request message is sent To AMF, the AMF sends an update PDU session management context message to the SMF.
  • the update PDU session management context message includes the PDU session release request; step 601b indicates that the SM policy association termination message sent by the PCF to the SMF carries the public tunnel Release information; step 601c means that the release PDU session management context message sent by AMF to SMF carries public tunnel release information; step 601d means that the N2 message sent by RAN carries public tunnel release information, and the N2 message is sent to AMF, and AMF to The SMF Update PDU Session Management Context message carries the public tunnel release information; step 601e indicates that the SMF executes the PDU session release trigger, that is, the public tunnel release is triggered.
  • Step 601f AMF sends an update PDU session management context to SMF.
  • Step 602a to step 602b SMF sends N4 Session Release Request to UPF; UPF sends N4 Session Release Response to SMF;
  • Steps 603a to 603d SMF sends an update PDU session management context response message to AMF; AMF and SMF perform Nsmf Communication N1N2 Message Transfer message; SMF sends a PDU session management context release response message to AMF; SMF sends a PDU session management context release response message to AMF Send an update PDU session management context response message;
  • Step 604 AMF sends an N2 resource release request (N2 Release Request) to the RAN;
  • Step 605 The RAN performs an access specific resource modification (AN specific resource modification) to the UE, including a PDU Session Release Command (PDU Session Release Command);
  • PDU Session Release Command PDU Session Release Command
  • Step 606 The RAN sends an N2 resource release acknowledgement (N2 Release ACK) to the AMF;
  • Step 607a to step 607b AMF sends an update PDU session management context N2 session management message (Nsmf PDU Session UpdateSMContext N2 SM info) to the SMF, and obtains an SMF response PDU session management context message (Nsmf PDU Session UpdateSMContext Response);
  • Nsmf PDU Session UpdateSMContext Response Nsmf PDU Session UpdateSMContext Response
  • Step 608 The UE sends a PDU Session Release Acknowledge (PDU Session Release ACK) to the RAN;
  • Step 609 The RAN sends an N2 Uplink NAS transport (N2 Uplink NAS transport) message to the AMF;
  • Steps 610a to 610b AMF sends a context request for SMF update PDU session management (which can also be referred to as Nsmf_PDUSession_UpdateSMContext request) to SMF; SMF sends an SMF update PDU session management context response (which can also be marked as Nsmf_PDUSession_UpdateSMContext Response) message to AMF to AMF;
  • SMF sends a context request for SMF update PDU session management (which can also be referred to as Nsmf_PDUSession_UpdateSMContext request) to SMF
  • SMF sends an SMF update PDU session management context response (which can also be marked as Nsmf_PDUSession_UpdateSMContext Response) message to AMF to AMF;
  • Step 611 AMF and SMF exchange PDU session management context status notification (release status) (Nsmf_PDUSession_SMContextStatusNotify (Release));
  • Step 612 The SMF and the PCF exchange information to terminate the session management policy association (SM Policy Association Termination).
  • the tunnel deletion information may include a tunnel identifier (tunnel ID) and a corresponding deletion instruction.
  • step 611 of this embodiment if the tunnel release process is initiated by the UE, PCF, or RAN, the SMF needs to notify the AMF of the session management context of the PDU session release, where the notified message carries the SMF ID (SMF ID), PDU session ID (PDU session ID), DNN and S-NSSAI.
  • SMF ID SMF ID
  • PDU session ID PDU session ID
  • DNN DNN
  • S-NSSAI S-NSSAI
  • step 612 of this embodiment if a dynamic PCC rule is deployed, the SMF also needs to notify the PCF that the policy control function of this session is terminated.
  • FIG. 8 is a schematic diagram 1 of the composition structure of a core network device according to an embodiment of the disclosure; as shown in FIG. 8, the device includes: an acquiring unit 71 and an initiating unit 72; wherein,
  • the obtaining unit 71 is configured to obtain a specific message
  • the initiating unit 72 is configured to initiate the establishment of a public tunnel based on the reservation mode based on the specific message obtained by the obtaining unit 71, and the public tunnel based on the reservation mode is used for related terminal devices that go online after the tunnel is established. Use;
  • the public tunnel supports multiple terminal equipment multiplexing.
  • the obtaining unit 71 is configured to obtain a first device-level message between core network devices; or is configured to obtain a first user message corresponding to a terminal device;
  • the initiating unit 72 is configured to initiate the establishment of a public tunnel based on the reservation mode through the first device-level message obtained by the obtaining unit 71; or configured to use the first user message obtained by the obtaining unit 71, Initiate the establishment of a public tunnel based on the reservation method.
  • the first user message is a message corresponding to any terminal device transmitted between core network devices.
  • the first core network device is an SMF; the initiating unit 72 is configured to pass through the first device between the core network devices when it detects that the conditions for establishing a public tunnel are met.
  • -Level message initiates the establishment of a public tunnel based on the reservation mode; or, receiving a first device-level message sent by AMF, initiates the establishment of a public tunnel based on the reservation mode based on the first device-level message; wherein, the first device-level message The message includes instruction information for establishing a public tunnel based on the reservation mode; the first device-level message is sent when the AMF detects that the condition for establishing a public tunnel is satisfied.
  • the first core network device is an SMF; the initiating unit 72 is configured to pass the first step in the information exchange process during the information exchange process corresponding to any terminal device A user message initiates the establishment of a public tunnel.
  • the initiating unit 72 is configured to initiate the establishment of a public tunnel through a first user message corresponding to any terminal device when it detects that a public tunnel establishment condition is met; or,
  • the device further includes a communication unit 73 configured to receive a first user message corresponding to any terminal device;
  • the initiating unit 72 is configured to initiate the establishment of a public tunnel based on the reservation mode when the first user message received by the communication unit 73 includes a public tunnel establishment request; wherein, the first user The message is sent by other core network equipment, or by any terminal equipment, or by the wireless access network equipment.
  • the device further includes a storage unit 74 or a communication unit 73;
  • the storage unit 74 is configured to store first policy information
  • the communication unit 73 is configured to receive the second policy information sent by the PCF; or, receive the subscription information sent by the UDM;
  • the initiating unit 72 is configured to initiate the establishment of a public tunnel based on the reservation mode based on the first policy information stored by the storage unit 74; or, initiate the establishment based on the second policy information received by the communication unit 73 The public tunnel based on the reservation mode; or, based on the subscription information received by the communication unit 73, the establishment of the public tunnel based on the reservation mode is initiated.
  • the device further includes a first selection unit 75 configured to, before the communication unit 73 receives the second policy information sent by the PCF, based on a pre-configured Choose PCF as the method; or,
  • the communication unit 73 is further configured to receive the instruction information sent by the AMF;
  • the first selection unit 75 is configured to select a PCF based on the instruction information received by the communication unit 73;
  • the communication unit 73 is further configured to perform first information interaction with the PCF selected by the first selection unit 75, and obtain the second policy information sent by the PCF based on the first information interaction.
  • the communication unit 73 is configured to perform a second information interaction with the UDM; and obtain the subscription information sent by the UDM based on the second information interaction.
  • the device further includes a second selection unit 76 configured to select UPF;
  • the initiating unit 72 is configured to perform a third information interaction with the UPF selected by the second selection unit 76 through the communication unit 73; the third information interaction is used to exchange the first policy information, the second Second, the policy information or the subscription information is sent to the selected UPF; the first policy information, the second policy information, or the subscription information is used for the UPF to establish the common relationship with the radio access network device tunnel.
  • the device further includes a releasing unit 77 configured to initiate the release of the public tunnel through a second device-level message between core network devices; or , Initiate the release of the public tunnel through a second user message corresponding to any terminal device.
  • a releasing unit 77 configured to initiate the release of the public tunnel through a second device-level message between core network devices; or , Initiate the release of the public tunnel through a second user message corresponding to any terminal device.
  • the first core network device is an SMF; the release unit 77 is configured to, when detecting that the public tunnel release conditions are met, indicate the public tunnel related information through a second device-level message.
  • the connected UPF and the radio access network device release the public tunnel; the second device-level message includes instruction information for releasing the public tunnel.
  • the releasing unit 77 is configured to instruct the UPF and the radio access network device to release the resources of the public tunnel through a second device-level message; Four information exchange, the fourth information exchange is used for the session management context released by the SMF and the AMF synchronization PDU session.
  • the first core network device is an SMF; the device further includes a communication unit 73 configured to receive a second user message corresponding to any terminal device;
  • the release unit 77 is configured to initiate the release of the public tunnel when the second message received by the communication unit 73 includes a public tunnel release request; or, it is detected that the public tunnel release conditions are met, or In a case where the pre-saved configuration information is satisfied, the release of the public tunnel is initiated through a second user message corresponding to the arbitrary terminal device.
  • the communication unit 73 is configured to receive a second user message from any terminal device; the second user message is sent by the arbitrary terminal device and arrives via the AMF The SMF; or, receive the second user message sent by the PCF; or, receive the second user message sent by the AMF; or, receive the second user message sent by the wireless access network device; the second user message is sent by the The radio access network device sends out and arrives at the SMF via the AMF.
  • the releasing unit 77 is configured to respectively indicate the UPF and wireless access associated with the public tunnel through a user message during the information exchange process corresponding to any terminal device.
  • the network equipment releases the public tunnel.
  • the communication unit 73 when the second user message is sent by a terminal device, a PCF, or a wireless access network device, the communication unit 73 is further configured to communicate with AMF. Five information exchange. The fifth information exchange is used for the session management context released by the SMF and the AMF synchronization PDU session.
  • the releasing unit 77 is configured to start a timer when it detects that all terminal devices associated with the public tunnel are offline; Before the timeout, if it is determined that no terminal device uses the public tunnel, initiate the release of the public tunnel.
  • the public tunnel is a public tunnel corresponding to a service, user group, network slice, or DNN.
  • the first selection unit 75 and the second selection unit 76 in the device can be controlled by the central processing unit (CPU, Central Processing Unit) and digital signal processor ( DSP, Digital Signal Processor), Microcontroller Unit (MCU, Microcontroller Unit) or Programmable Gate Array (FPGA, Field-Programmable Gate Array) implementation;
  • the communication unit 73 in the device can be implemented through the communication module in practical applications (Including: basic communication suite, operating system, communication module, standardized interface and protocol, etc.) and the realization of the transceiver antenna;
  • the storage unit 74 in the device can be realized by the memory in practical applications;
  • the acquisition unit 71, The initiating unit 72 and the releasing unit 77 can be implemented by a CPU, DSP, MCU or FPGA in combination with communication modules (including basic communication kits, operating systems, communication modules, standardized interfaces and protocols, etc.) and transceiver antennas in practical applications.
  • the core network equipment provided in the above embodiment performs tunnel multiplexing
  • only the division of the above program modules is used as an example for illustration.
  • the above processing can be allocated by different program modules according to needs. , That is, divide the internal structure of the core network equipment into different program modules to complete all or part of the processing described above.
  • the core network equipment provided in the foregoing embodiment and the embodiment of the tunnel multiplexing method belong to the same concept, and the specific implementation process is detailed in the method embodiment, and will not be repeated here.
  • FIG. 13 is a schematic diagram of the hardware composition structure of a core network device according to an embodiment of the disclosure.
  • the core network device 80 includes a memory 82, a processor 81, and is stored in the memory 82 and can run on the processor 81 When the processor 81 executes the computer program, the steps of the foregoing method in the embodiment of the present disclosure are implemented.
  • the core network device also includes a communication interface 83.
  • the various components in the core network device can be coupled together through the bus system 84.
  • the bus system 84 is used to implement connection and communication between these components.
  • the bus system 84 also includes a power bus, a control bus, and a status signal bus.
  • various buses are marked as the bus system 84 in FIG. 13.
  • the memory 82 may be a volatile memory or a non-volatile memory, and may also include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM, Read Only Memory), programmable read-only memory (PROM, Programmable Read-Only Memory), and erasable programmable read-only memory (EPROM, Erasable Programmable Read- Only Memory, Electrically Erasable Programmable Read-Only Memory (EEPROM, Electrically Erasable Programmable Read-Only Memory), Magnetic Random Access Memory (FRAM, Ferromagnetic Random Access Memory), Flash Memory (Flash Memory), Magnetic Surface Memory , CD-ROM, or CD-ROM (Compact Disc Read-Only Memory); magnetic surface memory can be magnetic disk storage or tape storage.
  • the volatile memory may be a random access memory (RAM, Random Access Memory), which is used as an external cache.
  • RAM random access memory
  • SRAM static random access memory
  • SSRAM synchronous static random access memory
  • Synchronous Static Random Access Memory Synchronous Static Random Access Memory
  • DRAM Dynamic Random Access Memory
  • SDRAM Synchronous Dynamic Random Access Memory
  • DDRSDRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • ESDRAM Enhanced Synchronous Dynamic Random Access Memory
  • SLDRAM synchronous connection dynamic random access memory
  • DRRAM Direct Rambus Random Access Memory
  • the memory 82 described in the embodiments of the present disclosure is intended to include, but is not limited to, these and any other suitable types of memory.
  • the methods disclosed in the foregoing embodiments of the present disclosure may be applied to the processor 81 or implemented by the processor 81.
  • the processor 81 may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method can be completed by an integrated logic circuit of hardware in the processor 81 or instructions in the form of software.
  • the aforementioned processor 81 may be a general-purpose processor, a DSP, or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and the like.
  • the processor 81 may implement or execute various methods, steps, and logical block diagrams disclosed in the embodiments of the present disclosure.
  • the general-purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present disclosure may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module may be located in a storage medium, and the storage medium is located in the memory 82.
  • the processor 81 reads the information in the memory 82 and completes the steps of the foregoing method in combination with its hardware.
  • the core network device may be configured by one or more Application Specific Integrated Circuits (ASIC, Application Specific Integrated Circuit), DSP, Programmable Logic Device (PLD, Programmable Logic Device), and Complex Programmable Logic Device (CPLD). , Complex Programmable Logic Device, FPGA, general-purpose processor, controller, MCU, microprocessor (Microprocessor), or other electronic components to implement the foregoing method.
  • ASIC Application Specific Integrated Circuit
  • DSP Digital Signal Processing
  • PLD Programmable Logic Device
  • CPLD Complex Programmable Logic Device
  • FPGA field-programmable Logic Device
  • controller MCU
  • microprocessor Microprocessor
  • the embodiment of the present disclosure also provides a computer-readable storage medium, such as a memory 82 including a computer program, which can be executed by the processor 81 of the core network device 80 to complete the aforementioned method. step.
  • the computer-readable storage medium may be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disk, or CD-ROM.
  • 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, the steps of the method described in the embodiment of the present disclosure are implemented.
  • the disclosed device and method may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, such as: 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 coupling, or direct coupling, or communication connection between the components shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms. of.
  • the units described above as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units; Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • the functional units in the embodiments of the present disclosure can be all integrated into one processing unit, or each unit can be individually used as a unit, or two or more units can be integrated into one unit;
  • the unit can be implemented in the form of hardware, or in the form of hardware plus software functional units.
  • the foregoing program can be stored in a computer readable storage medium. When the program is executed, it is executed. Including the steps of the foregoing method embodiment; and the foregoing storage medium includes: various media that can store program codes, such as a mobile storage device, ROM, RAM, magnetic disk, or optical disk.
  • the aforementioned integrated unit of the present disclosure is implemented in the form of a software function module and sold or used as an independent product, it may also be stored in a computer readable storage medium.
  • the computer software product is stored in a storage medium and includes several instructions for A computer device (which may be a personal computer, a server, or a network device, etc.) executes all or part of the methods described in the various embodiments of the present disclosure.
  • the aforementioned storage media include: removable storage devices, ROM, RAM, magnetic disks, or optical disks and other media that can store program codes.

Abstract

本公开实施例公开了一种隧道复用方法和核心网设备。所述方法包括：第一核心网设备基于获得的特定消息，发起建立基于预留方式的公共隧道，所述基于预留方式的公共隧道用于在隧道建立完成后上线的相关终端设备使用；所述公共隧道支持多个终端设备复用。

Description

一种隧道复用方法和核心网设备
相关申请的交叉引用
本公开基于申请号为201910935943.6、申请日为2019年9月29日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此以引入方式并入本公开。
技术领域
本公开涉及无线通信技术领域，具体涉及一种隧道复用方法和核心网设备。
背景技术
相比于4G网络，5G网络引入了服务化功能设计，以实现网络功能的灵活定制和组合。对于5G网络而言，核心网通过控制和转发理念，降低简化用户面，以实现高效转发；接入网通过集中单元(CU，Centralized Unit)/分布单元(DU，Distributed Unit)分离，实现无线资源的集中控制和协作。值得一提的是，4G用户附着上线之后将保持在线的状态，复用隧道不太可能实现，因此将会造成资源的一定程度的浪费。
发明内容
本公开实施例提供一种隧道复用方法和核心网设备。
本公开实施例的技术方案是这样实现的：
本公开实施例提供了一种隧道复用方法，所述方法包括：
第一核心网设备基于获得的特定消息，发起建立基于预留方式的公共隧道，所述基于预留方式的公共隧道用于在隧道建立完成后上线的相关终 端设备使用；所述公共隧道支持多个终端设备复用。
在本公开的一些可选实施例中，所述第一核心网设备基于获得的特定消息，发起建立基于预留方式的公共隧道，包括：
第一核心网设备通过核心网设备之间的第一设备级消息，发起建立基于预留方式的公共隧道；或者，
第一核心网设备通过对应于终端设备的第一用户消息，发起建立基于预留方式的公共隧道。
在本公开的一些可选实施例中，所述第一核心网设备为会话管理功能(SMF，Session Management Function)；所述第一核心网设备通过核心网设备之间的第一设备级消息，发起建立基于预留方式的公共隧道，包括：
SMF检测到满足建立公共隧道的条件时，通过核心网设备之间的第一设备级消息发起建立基于预留方式公共隧道；或者，
SMF接收到接入及移动性管理功能(AMF，Access and Mobility Management Function)发送的第一设备级消息，基于所述第一设备级消息发起建立基于预留方式的公共隧道；其中，所述第一设备级消息中包括用于建立基于预留方式的公共隧道的指示信息；所述第一设备级消息在所述AMF检测到满足建立公共隧道的条件时发送。
在本公开的一些可选实施例中，所述第一用户消息为核心网设备间传输的对应于任意终端设备的消息。
在本公开的一些可选实施例中，所述第一核心网设备为SMF；所述第一核心网设备通过对应于终端设备的第一用户消息，发起建立基于预留方式的公共隧道，包括：在任意终端设备对应的信息交互过程中，所述SMF通过所述信息交互过程中的第一用户消息发起建立公共隧道。
在本公开的一些可选实施例中，所述SMF通过所述信息交互过程中的第一用户消息发起建立公共隧道，包括：
所述SMF检测到满足公共隧道建立条件的情况下，通过对应于任意终端设备的第一用户消息发起建立公共隧道；或者，
所述SMF接收到对应于任意终端设备的第一用户消息，在所述第一用户消息中包括公共隧道建立请求的情况下，发起建立基于预留方式的公共隧道；
其中，所述第一用户消息由其他核心网设备发出、或者由任意终端设备发出、或者由无线接入网设备发出。
在本公开的一些可选实施例中，所述第一核心网设备为SMF；所述发起建立基于预留方式的公共隧道，包括：
所述SMF基于本地保存的第一策略信息发起建立基于预留方式的公共隧道；或者，
所述SMF接收策略控制功能(PCF，Policy Control Function)发送的第二策略信息，基于所述第二策略信息发起建立基于预留方式的公共隧道；或者，
所述SMF接收统一数据管理功能(UDM，Unified Data Management)发送的签约信息，基于所述签约信息发起建立基于预留方式的公共隧道。
在本公开的一些可选实施例中，所述SMF接收PCF发送的第二策略信息之前，所述方法还包括：
所述SMF基于预先配置的方式选择PCF；或者，所述SMF接收AMF发送的指示信息，基于所述指示信息选择PCF；
相应的，所述SMF接收PCF发送的第二策略信息，包括：所述SMF与选择的PCF进行第一信息交互，基于所述第一信息交互获得所述PCF发送的所述第二策略信息。
在本公开的一些可选实施例中，所述SMF接收UDM发送的签约信息，包括：所述SMF与所述UDM进行第二信息交互；基于所述第二信息交互 获得所述UDM发送的签约信息。
在本公开的一些可选实施例中，所述发起建立基于预留方式的公共隧道，包括：所述SMF选择UPF，与选择的UPF进行第三信息交互；所述第三信息交互用于将所述第一策略信息、所述第二策略信息或所述签约信息发送至选择的UPF；所述第一策略信息、所述第二策略信息或所述签约信息用于所述UPF建立与无线接入网设备之间的所述公共隧道。
在本公开的一些可选实施例中，所述方法还包括：所述第一核心网设备通过核心网设备之间的第二设备级消息，发起释放所述公共隧道；或者，
第一核心网设备通过对应于任意终端设备的第二用户消息，发起释放所述公共隧道。
在本公开的一些可选实施例中，所述第一核心网设备为SMF；所述第一核心网设备通过核心网设备之间的第二设备级消息，发起释放所述公共隧道，包括：所述SMF检测到满足公共隧道释放条件时，通过第二设备级消息分别指示公共隧道相关联的UPF和无线接入网设备释放所述公共隧道；所述第二设备级消息中包括用于释放所述公共隧道的指示信息。
在本公开的一些可选实施例中，所述通过所述第二设备级消息分别指示公共隧道相关联的UPF和无线接入网设备释放所述公共隧道，包括：
所述SMF通过第二设备级消息分别指示UPF和无线接入网设备释放所述公共隧道的资源；
所述SMF与AMF进行第四信息交互，所述第四信息交互用于所述SMF与所述AMF同步PDU会话释放的会话管理上下文。
在本公开的一些可选实施例中，所述第一核心网设备为SMF；所述第一核心网设备通过对应于终端设备的第二用户消息，发起释放所述公共隧道，包括：所述SMF接收到对应于任意终端设备的第二用户消息，在所述第二消息中包括公共隧道释放请求的情况下，发起释放所述公共隧道；或 者，
所述SMF检测到满足公共隧道释放条件，或者满足预先保存的配置信息的情况下，通过对应于所述任意终端设备的第二用户消息发起释放所述公共隧道。
在本公开的一些可选实施例中，所述SMF接收到对应于终端设备的第二用户消息，包括：所述SMF接收来自任意终端设备的第二用户消息；所述第二用户消息由所述任意终端设备发出、经所述AMF到达所述SMF；或者，
所述SMF接收PCF发送的第二用户消息；或者，
所述SMF接收AMF发送的第二用户消息；或者，
所述SMF接收无线接入网设备发送的第二用户消息；所述第二用户消息由所述无线接入网设备发出、经AMF到达所述SMF。
在本公开的一些可选实施例中，所述发起释放所述公共隧道，包括：所述SMF在对应于任意终端设备的信息交互过程中、通过用户消息分别指示与所述公共隧道相关联的UPF和无线接入网设备释放所述公共隧道。
在本公开的一些可选实施例中，在所述第二用户消息由终端设备发出、PCF发出或无线接入网设备发出的情况下，所述方法还包括：
所述SMF与AMF进行第五信息交互，所述第五信息交互用于所述SMF与所述AMF同步PDU会话释放的会话管理上下文。
在本公开的一些可选实施例中，所述SMF检测到满足公共隧道释放条件，包括：所述SMF检测到所述公共隧道相关联的所有终端设备处于下线状态时，启动定时器；
在所述定时器的定时时间超时之前，确定没有终端设备使用所述公共隧道的情况下，满足公共隧道释放条件。
在本公开的一些可选实施例中，所述公共隧道为对应于业务、用户组、 网络切片或数据网络名称(DNN，Data Network Name)的公共隧道。
本公开实施例还提供了一种核心网设备，所述核心网设备为第一核心网设备，所述设备包括：获取单元和发起单元；其中，
所述获取单元，配置为获得特定消息；
所述发起单元，配置为基于所述获取单元获得的特定消息，发起建立基于预留方式的公共隧道，所述基于预留方式的公共隧道用于在隧道建立完成后上线的相关终端设备使用；所述公共隧道支持多个终端设备复用。
在本公开的一些可选实施例中，所述获取单元，配置为获得核心网设备之间的第一设备级消息；或者配置为获得对应于终端设备的第一用户消息；
所述发起单元，配置为通过所述获取单元获得的所述第一设备级消息，发起建立基于预留方式的公共隧道；或者配置为通过所述获取单元获得的第一用户消息，发起建立基于预留方式的公共隧道。
在本公开的一些可选实施例中，所述第一核心网设备为SMF；所述发起单元，配置为检测到满足建立公共隧道的条件时，通过核心网设备之间的第一设备级消息发起建立基于预留方式公共隧道；或者，接收到AMF发送的第一设备级消息，基于所述第一设备级消息发起建立基于预留方式的公共隧道；其中，所述第一设备级消息中包括用于建立基于预留方式的公共隧道的指示信息；所述第一设备级消息在所述AMF检测到满足建立公共隧道的条件时发送。
在本公开的一些可选实施例中，所述第一用户消息为核心网设备间传输的对应于任意终端设备的消息。
在本公开的一些可选实施例中，所述第一核心网设备为SMF；所述发起单元，配置为在任意终端设备对应的信息交互过程中，通过所述信息交互过程中的第一用户消息发起建立公共隧道。
在本公开的一些可选实施例中，所述发起单元，配置为检测到满足公共隧道建立条件的情况下，通过对应于任意终端设备的第一用户消息发起建立公共隧道；或者，
所述设备还包括通讯单元，配置为接收对应于任意终端设备的第一用户消息；
所述发起单元，配置为在所述通讯单元接收到的所述第一用户消息中包括公共隧道建立请求的情况下，发起建立基于预留方式的公共隧道；其中，所述第一用户消息由其他核心网设备发出、或者由任意终端设备发出、或者由无线接入网设备发出。
在本公开的一些可选实施例中，所述设备还包括存储单元或通讯单元；
其中，所述存储单元，配置为存储第一策略信息；
所述通讯单元，配置为接收PCF发送的第二策略信息；或者，接收UDM发送的签约信息；
所述发起单元，配置为基于所述存储单元存储的所述第一策略信息发起建立基于预留方式的公共隧道；或者，基于所述通讯单元接收的所述第二策略信息发起建立基于预留方式的公共隧道；或者，基于所述通讯单元接收的所述签约信息发起建立基于预留方式的公共隧道。
在本公开的一些可选实施例中，所述设备还包括第一选择单元，配置为所述通讯单元接收PCF发送的第二策略信息之前，基于预先配置的方式选择PCF；或者，
所述通讯单元，还配置为接收AMF发送的指示信息；
所述选择单元，配置为基于所述通讯单元接收的所述指示信息选择PCF；
所述通讯单元，还配置为与所述第一选择单元选择的PCF进行第一信息交互，基于所述第一信息交互获得所述PCF发送的所述第二策略信息。
在本公开的一些可选实施例中，所述通讯单元，配置为与所述UDM进行第二信息交互；基于所述第二信息交互获得所述UDM发送的签约信息。
在本公开的一些可选实施例中，所述设备还包括第二选择单元，配置为选择UPF；
所述发起单元，配置为通过所述通讯单元与所述第二选择单元选择的UPF进行第三信息交互；所述第三信息交互用于将所述第一策略信息、所述第二策略信息或所述签约信息发送至选择的UPF；所述第一策略信息、所述第二策略信息或所述签约信息用于所述UPF建立与无线接入网设备之间的所述公共隧道。
在本公开的一些可选实施例中，所述设备还包括释放单元，配置为通过核心网设备之间的第二设备级消息，发起释放所述公共隧道；或者，通过对应于任意终端设备的第二用户消息，发起释放所述公共隧道。
在本公开的一些可选实施例中，所述第一核心网设备为SMF；所述释放单元，配置为检测到满足公共隧道释放条件时，通过第二设备级消息分别指示公共隧道相关联的UPF和无线接入网设备释放所述公共隧道；所述第二设备级消息中包括用于释放所述公共隧道的指示信息。
在本公开的一些可选实施例中，所述释放单元，配置为通过第二设备级消息分别指示UPF和无线接入网设备释放所述公共隧道的资源；还配置为与AMF进行第四信息交互，所述第四信息交互用于所述SMF与所述AMF同步PDU会话释放的会话管理上下文。
在本公开的一些可选实施例中，所述第一核心网设备为SMF；所述设备还包括通讯单元，配置为接收对应于任意终端设备的第二用户消息；
所述释放单元，配置为在所述通讯单元接收到的所述第二消息中包括公共隧道释放请求的情况下，发起释放所述公共隧道；或者，检测到满足公共隧道释放条件，或者满足预先保存的配置信息的情况下，通过对应于 所述任意终端设备的第二用户消息发起释放所述公共隧道。
在本公开的一些可选实施例中，所述通讯单元，配置为接收来自任意终端设备的第二用户消息；所述第二用户消息由所述任意终端设备发出、经所述AMF到达所述SMF；或者，接收PCF发送的第二用户消息；或者，接收AMF发送的第二用户消息；或者，接收无线接入网设备发送的第二用户消息；所述第二用户消息由所述无线接入网设备发出、经AMF到达所述SMF。
在本公开的一些可选实施例中，所述释放单元，配置为在对应于任意终端设备的信息交互过程中、通过用户消息分别指示与所述公共隧道相关联的UPF和无线接入网设备释放所述公共隧道。
在本公开的一些可选实施例中，在所述第二用户消息由终端设备发出、PCF发出或无线接入网设备发出的情况下，所述通讯单元，还配置为与AMF进行第五信息交互，所述第五信息交互用于所述SMF与所述AMF同步PDU会话释放的会话管理上下文。
在本公开的一些可选实施例中，所述释放单元，配置为检测到所述公共隧道相关联的所有终端设备处于下线状态时，启动定时器；在所述定时器的定时时间超时之前，确定没有终端设备使用所述公共隧道的情况下，发起释放所述公共隧道。
在本公开的一些可选实施例中，所述公共隧道为对应于业务、用户组、网络切片或DNN的公共隧道。
本公开实施例还提供了一种计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行时实现本公开实施例所述方法的步骤。
本公开实施例还提供了一种核心网设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，所述处理器执行所述程序时实现本公开实施例所述方法的步骤。
本公开实施例提供的隧道复用方法和通信设备，所述方法包括：第一核心网设备基于获得的特定消息，发起建立基于预留方式的公共隧道，所述基于预留方式的公共隧道用于在隧道建立完成后上线的相关终端设备使用；所述公共隧道支持多个终端设备复用。采用本公开实施例的技术方案，通过发起建立基于预留方式的公共隧道的方式实现对隧道的复用，避免了隧道的反复建立和删除所带来的信令资源消耗，从而提高了资源利用率，减少资源的空闲和浪费。
附图说明
图1为5G网络的架构图；
图2为相关技术中的会话建立流程图；
图3为本公开实施例的隧道复用方法的流程示意图一；
图4为本公开实施例的隧道复用方法的流程示意图二；
图5为本公开实施例的隧道复用方法的流程示意图三；
图6为本公开实施例的隧道复用方法的流程示意图四；
图7为本公开实施例的隧道复用方法的流程示意图五；
图8为本公开实施例的核心网设备的组成结构示意图一；
图9为本公开实施例的核心网设备的组成结构示意图二；
图10为本公开实施例的核心网设备的组成结构示意图三；
图11为本公开实施例的核心网设备的组成结构示意图四；
图12为本公开实施例的核心网设备的组成结构示意图五；
图13为本公开实施例的核心网设备的硬件组成结构示意图。
具体实施方式
为方便本领域技术人员进行理解，首先对本公开实施例中涉及到的部分背景知识进行介绍。
图1为5G网络的架构图，如图1所示，5G网络架构主要包括鉴权服务功能(AUSF，Authentication Server Function)实体、网络切片选择功能(NSSF，Network Slice Selection Function)实体、策略控制功能(PCF，Policy Control Function)实体、网元数据仓库功能(NRF，NF Repository Function)实体、接入及移动性管理功能(AMF，Access and Mobility Management Function)实体、会话管理功能(SMF，Session Management Function)实体、统一数据管理功能(UDM，Unified Data Management)实体、用户面功能(UPF，User Plane Function)实体等功能网元；其中，初期要求服务化的有：AMF、SMF、PCF、AUSF、UDM、NSSF等，暂未要求服务化的为NEF、UDR、UPF。
其中，SMF可对应4G网络中控制面服务网关(SGW-C，Serving Gateway-C)和控制面分组数据网络网关(PGW-C，Packet data network Gateway-C)的部分功能，SMF负责5G用户的会话的生命周期管理、IP地址分配、数据路由选择、业务连续性管理、策略规则匹配以及流量计费处理等功能。
其中，SMF应支持的会话管理相关功能可包括：
1、支持根据用户终端(UE，User Equipment)和业务服务器基于不同业务的请求进行协议数据单元(PDU，Protocol Data Unit)会话的建立，根据UE或网络基于不同业务的请求进行PDU会话的修改和释放；
2、支持建立互联网协议第四版(IPv4，Internet Protocol version 4)、互联网协议第六版(IPv6)、以太网和非结构化的PDU会话类型；
3、支持单UE多会话的会话控制；
4、支持通过获取UDM中会话级别的签约信息，判断UE的请求是否合理，签约类型可包括允许和缺省的PDU会话类型、允许和缺省的会话与业务连续性(SSC，Session and Service Continuity)模式、服务质量(QoS， Quality of Service)信息和IP地址或前缀；
5、当会话连接处于空闲态时，支持下行数据的数字数据网(DDN，Digital Data Network)；
6、在互操作过程中，支持演进的分组系统(EPS，Evolved Packet System)QoS映射、业务流模板(TFT，Traffic Flow Template)分配、申请EPS承载标识等功能，支持接收UE通过控制观察点(PCO，Point of Control and Observation)参数发来的PDU会话标识(PDU Session ID)等信息；
7、支持二次鉴权；
8、支持紧急PDU session建立；
9、支持在PDU session建立过程中，向UE返回本地预配置的代理呼叫会话控制功能(P-CSCF，Proxy-Call Session Control Function)地址列表。
对于IP地址分配功能，SMF应支持根据PDU会话类型分配IP地址；其中，分配方式为可通过本地分配，也可以通过动态主机配置协议(DHCP，Dynamic Host Configuration Protocol)v4/DHCPv6等方式从外部网络获取用户IP地址。对于非多归属(multi-homing)的IPv4或IPv6会话，SMF只为UE分配一个IPv4或IPv6地址；对于multi-homing的会话，SMF可以分配多个IPv6地址。
对于数据路由功能，SMF应支持根据本地策略、数据网络名称(DNN，Data Network Name)、应用层功能(AF，Application Function)策略等信息选择UPF。为支持PDU会话的上行流量分流功能，SMF应支持：
1、在数据路由路径中插入或删除一个或多个支持上行流量分流的UPF；
2、基于不同目的地址的上行流量，制定分流策略并下发至支持上行流量分流的UPF；
另外，为同时支持到本地业务和中心业务的IPv6会话连接，也保证SSC 模式三的业务连续性，SMF应支持如下：
3、插入或删除支持瞄点(其也可以称为Branching Point)的UPF；
4、基于不同PDU会话的IPv6源地址前缀，制定分流策略并下发至支持Branching Point的UPF；
此外，SMF还应支持其他数据路由功能，主要包括如下六项：
5、当AF订阅了SMF通知，SMF支持直接发送通知给AF；
6、支持将当前支持区域上报给AMF，当新建、修改会话或UE离开SMF的服务区域时，SMF根据AMF通知的最新位置决定是否重新选择UPF；
7、支持核心网隧道(CN Tunnel，CoreNetwork Tunnel)的分配和释放；
8、支持通过拒绝非接入层(NAS，Non-access stratum)请求实现过载控制功能；
9、支持本地数据网络(LADN，Local Area Data Network)相关功能要求，即SMF应支持根据AMF提供的用户可用的LADN信息，当用户进入或离开该LADN的服务区域时，触发会话的建立或删除；
10、支持业务链功能，即在本地配置业务链策略ID相关的策略，当接收到PCC规则中如包含业务链控制信息，则将信息传递至UPF执行。
对于业务连续性管理功能，为支持移动性下的会话与业务连续性，SMF应支持根据UE会话建立请求中和UE签约信息中的SSC模式，选择该会话的SSC模式，如果SMF不支持该模式则拒绝会话建立请求。
其中，针对SSC模式二，SMF应支持如下功能：
1、SMF先触发当前会话的释放，再通知UE建立接入相同数据网络(DN，Data Network)的新的会话；
2、如果当前会话有多个IP锚点，则SMF需要将所有IP锚点释放或重分配；
针对SSC模式三，SMF应支持如下功能：
3、SMF先通知UE建立接入相同DN的新的会话，并指示UE当前会话的保持时间；当前会话保持时间超时后，SMF再触发会话的释放(也可由UE提前触发会话释放)；
4、如果是multi-homing场景，SMF也可以新建锚点；
对于策略控制功能，SMF应支持本地配置和接收PCF下发的策略控制相关功能，主要包括如下五项：
1、支持配置报文检测规则并下发至UPF；
2、支持业务流检测功能，根据策略与计费控制规则(PCC，Policy and Charging Control)规则中的数据业务流模板对上行和下行的业务流进行识别；
3、支持用量检测功能，根据PCC规则要求，进行规则指定业务的用量累计与上报；
4、支持QoS控制功能，汇总所有的PCC规则，统计针对一个QoS Flow的保证比特速率(GBR，Guaranteed Bit Rate)、最大比特速率(MBR，Maximum Bit Rate)；并确定针对一个PDU Session的会话聚合最大比特速率(Session-AMBR，Session-Aggregate Maximum Bit Rate)。
5、支持ADC功能，实现业务检测和控制功能，支持通过安装、修改和删除包含了TDF应用标识(TDF-Application-Identifier)的PCC规则，从而实现业务数据开始和结束事件的上报，并依据策略规则定义的动作。
对于计费流量处理功能，SMF应支持将计费策略下发至UPF，同时支持将从UPF上接收的计费信息送至计费网关，同时，SMF支持计费暂停功能。
图2为相关技术中的会话建立流程图。需要说明的是，图2针对的是UE已经在AMF上注册的场景，则除非是紧急注册的UE，否则AMF已经 从UDM检索了用户订阅数据。如图2所示，相关技术中建立PDU会话的流程包括：
步骤101：UE向AMF发送NAS消息(S-NSSAI(s)、DNN、PDU会话ID、请求类型、旧PDU会话ID、N1SM容器)。其中，N1SM容器中带有PDU会话建立请求。
步骤102：AMF进行SMF选择，存储S-NSSAI(s)、DNN、PDU会话ID、SMF ID以及PDU会话的访问类型的关联。
步骤103：AMF发送SMF创建PDU会话管理的上下文请求(也可以称为Nsmf_PDUSession_CreateSMContext Request)消息给SMF，消息中携带用户相关信息，如用户位置信息(ULI，User Location Information)、PDU会话状态通知的订阅、DNN选择模式等。
步骤104：SMF与UDM交互会话管理订阅数据，用于订阅检索/订阅更新。
步骤105：SMF发送SMF创建PDU会话管理的上下文响应(也可称为Nsmf_PDUSession_CreateSMContext Response)消息给AMF，消息中携带了原因值和SM上下文等。
步骤106：初次建立PDU会话期间的PDU会话验证/授权。
步骤107a至步骤107b：SMF进行PCF选择。如果要为PDU会话使用动态PCC，SMF可根据AMF的指示或本地配置选择PCF；否则，SMF可以应用本地策略；SMF可以执行会话管理(SM，Session Management)策略关联建立过程，以便与PCF建立SM策略关联，并为PDU会话获得默认的PCC规则；或者，SMF可以发起SM策略关联修改。
步骤108：SMF根据UPF的位置、DNN、权重信息等选择UPF，如果不需要PCC规则作为UPF选择的输入，则可以在步骤108之后执行步骤107。
步骤109：SMF可以执行SMF发起的SM策略关联修改过程，以提供关于已满足的策略控制请求触发条件的信息；如果请求类型为“初始请求”，部署了动态PCC，并且PDU会话类型为IPv4、IPv6或IPv4v6，那么SMF将使用分配的UE IP地址/前缀通知PCF(如果满足策略控制请求触发条件)。
步骤110a至步骤110b：SMF向UPF发送N4会话建立/修改请求，UPF向SMF发送N4会话建立/修改响应，并与UPF合作分配核心网信道信息(即CN Tunnel Info)。
步骤111：SMF向AMF发送用于N1N2通信的传输消息(也可称为Namf_Communication_N1N2Message Transfer消息)，并将CN Tunnel Info相关信息告知AMF。
步骤112：AMF向无线接入网(RAN，Radio Access Network)发送NAS消息(NAS msg)，包含N2PDU会话请求，携带从SMF得到的CN Tunnel Info。
步骤113：RAN与UE之间发起接入特别资源流程，携带PDU会话建立接受消息；RAN为UE分配接入网信道信息((AN，Access Network)Tunnel Info)，且PDU会话建立成功。
步骤114：RAN响应N2PDU会话响应消息给AMF，携带原因值和AN Tunnel Info等。
步骤115：AMF向SMF发送SMF更新PDU会话管理的上下文请求(其也可以称为Nsmf_PDUSession_UpdateSMContext请求，其携带SM上下文ID、N2 SM信息、请求类型)，AMF将从RAN接收到的N2 SM信息(携带AN Tunnel Info等)转发给SMF。
步骤116a至步骤116c：SMF向UPF发送N4会话修改请求；UPF向SMF发送N4会话修改响应；SMF向UPF提供隧道信息以及相应的转发规 则。SMF和UDM进行信息交互，完成注册。
步骤117：SMF向AMF发送SMF更新PDU会话管理上下文响应(其也可以记为Nsmf_PDUSession_UpdateSMContext Response)消息给AMF，携带原因值。
步骤118：SMF向AMF发送SMF PDU会话管理上下文状态通知。
步骤119：SMF进行IPv6地址配置。
步骤120：SMF和UDM进行信息交互，取消订阅。
需要说明的是，在4G核心网中，会话建立通常是在用户附着时完成的；在5G核心网中，目前的机制也是由用户请求PDU会话的建立。但是随着业务的发展，出现了许多类似于物联网的低频小包业务，而且5G愿景中物联网的连接密度为每平方公里有1兆(M)的设备量，如此巨大的连接规模对核心网设备是一个巨大的挑战。如果为这类业务每个用户分配一个对应的隧道，并基于4G“永远在线”的原则，会造成对网络资源的极大浪费，因为通常衡量SAE GW的性能指标就是PDU会话的数量；而且隧道的建立和拆除也会产生信令消耗，因此可以为某类业务在核心网中一直保持着某类隧道以减少此类消耗。当然，本公开实施例的应用场景包括但不限于物联网低频小包业务场景。
下面结合附图及具体实施例对本公开作进一步详细的说明。
本公开实施例提供了一种隧道复用方法。图3为本公开实施例的隧道复用方法的流程示意图一；如图3所示，所述方法包括：
步骤201：第一核心网设备基于获得的特定消息，发起建立基于预留方式的公共隧道，所述基于预留方式的公共隧道用于在隧道建立完成后上线的相关终端设备使用；所述公共隧道支持多个终端设备复用。
本实施例中，公共隧道可以理解为可通过共享的方式支持多个终端设备复用的隧道，其并非是专门为某个PDU会话所建立的隧道。
其中，所述公共隧道为对应于业务、用户组(UE group)、网络切片或数据网络名称(DNN)的公共隧道。可以理解，所述公共隧道可以是专用于某个业务的公共隧道，或者针对某个用户组内的用户使用的公共隧道，或者专用于某个网络切片的公共隧道，或者针对某个数据网络名称(DNN)的公共隧道。当然，本公开实施例不限于此，所述公共隧道还可以是对应于特定区域的公共隧道，或者是对应于特定号段的公共隧道。可以理解，根据不同的用户组、不同的业务、不同的网络切片、不同的DNN，甚至不同的号段、不同的位置，均可以采用不同的隧道进行PDU会话的传输，
本实施例中，所述第一核心网具体可以是SMF，即由SMF发起建立基于预留方式的公共隧道。其中，SMF是基于获得的特定消息发起建立基于预留方式的公共隧道。其中，所述特定消息可以是由其他核心网设备发送的，也可以是由任意终端设备发送的。
本实施例在业务需求之前、建立基于预留方式建立公共隧道，可以理解，本实施例中的公共隧道的建立与用户行为无关。采用预留方式建立公共隧道，实现多个终端设备的复用。例如，即使没有任何一个终端在线，该预留方式的公共隧道也会一直保留；一个终端设备上线后使用该预留方式的公共隧道进行数据传输；当另一个终端设备上线后也可使用该预留方式的公共隧道进行数据传输；使用该预留方式的公共隧道的最后一个终端设备下线后，该预留方式的公共隧道也依然保留。这样避免了隧道的反复建立和删除所带来的信令资源消耗，从而提供有效的隧道管理并提高资源利用率。
在本公开的一种可选实施例中，所述第一核心网设备基于获得的特定消息，发起建立基于预留方式的公共隧道，包括：第一核心网设备通过核心网设备之间的第一设备级消息，发起建立基于预留方式的公共隧道；或者，第一核心网设备通过对应于终端设备的第一用户消息，发起建立基于 预留方式的公共隧道。其中，所述第一用户消息为核心网设备间传输的对应于任意终端设备的消息。
本实施例中，作为第一种实施方式，第一核心网设备可通过设备级消息的方式发起建立基于预留方式的公共隧道。所述的设备级消息，即通过核心网设备之间的消息交互，发起建立基于预留方式的公共隧道。可以理解，在满足公共隧道建立条件的情况下，通过某一核心网设备(该核心网设备可以是所述第一核心网设备自身，也可以是其他核心网设备)发起建立公共隧道，由所述第一核心网设备通过核心网设备之间的信息交互建立基于预留方式的公共隧道。
作为第二种实施方式，第一核心网设备还可通过对应于任意终端设备的用户消息的方式发起建立基于预留方式的公共隧道。其中，所述对应于任意终端设备的用户消息，为任意终端设备与网络侧设备进行信息交互的消息。例如，某终端设备发起会话建立，则对应于该终端设备的会话建立流程中的任意用户消息中可携带用于建立所述公共隧道的请求，所述任意用户消息可以是会话建立流程中由终端设备发送的用户消息，也可以是该会话建立流程中由其他网络设备(如无线接入网设备或核心网设备)发送的用户消息，即在任意终端设备的已有的用户消息基础上，通过“搭便车”的方式，在已有的用户消息中添加用于请求建立基于预留方式的公共隧道的信息；第一核心网设备在获得该信息后，建立基于预留方式的公共隧道。
在所述公共隧道由第一用户消息发起的情况下，在本公开的一种可选实施例中，所述第一核心网设备通过对应于终端设备的第一用户消息，发起建立基于预留方式的公共隧道，包括：在任意终端设备对应的信息交互过程中，所述SMF通过所述信息交互过程中的第一用户消息发起建立公共隧道。
其中，所述SMF通过所述信息交互过程中的第一用户消息发起建立公 共隧道，包括：所述SMF检测到满足公共隧道建立条件的情况下，通过对应于任意终端设备的第一用户消息发起建立公共隧道；或者，所述SMF接收到对应于任意终端设备的第一用户消息，在所述第一用户消息中包括公共隧道建立请求的情况下，发起建立基于预留方式的公共隧道；其中，所述第一用户消息由其他核心网设备发出、或者由任意终端设备发出、或者由无线接入网设备发出。
本实施例中，可由SMF在检测到满足公共隧道建立条件的情况下，通过对应于任意终端设备的第一用户消息发起建立基于预留方式的公共隧道；或者可以由其他核心网设备或任意终端设备或无线接入网设备通过第一用户消息发起建立基于预留方式的公共隧道。可以理解，本实施例中，基于预留方式的公共隧道的发起者可以是SMF、或者除SMF以外的其他核心网设备(例如AMF)、或者任意终端设备、或者无线接入网设备等。
在本公开的一种可选实施例中，所述发起建立基于预留方式的公共隧道，包括：所述SMF基于本地保存的第一策略信息发起建立基于预留方式的公共隧道；或者，所述SMF接收PCF发送的第二策略信息，基于所述第二策略信息发起建立基于预留方式的公共隧道；或者，所述SMF接收UDM发送的签约信息，基于所述签约信息发起建立基于预留方式的公共隧道。
本实施例中，SMF建立基于预留方式的公共隧道，具体可通过(A)SMF本地配置、(B)PCF策略下发、(C)UDM签约信息下发三种方式确定隧道复用策略。其中，作为第一种实施方式，可预先在SMF本地配置第一策略信息，使得SMF本次存储有所述第一策略信息。作为第二种实施方式，在SMF建立基于预留方式的公共隧道，可从PCF获得第二策略信息，或者从UDM获得签约信息。SMF可基于上述第一策略信息、第二策略信息或签约信息建立基于预留方式的公共隧道。其中，所述第一策略信息、第二策略信息或签约信息中的内容可以包括终端设备是否可使用公共隧道 进行数据传输。
可以理解，SMF一方面将公共隧道建立相关的信息发送至选择的UPF，另一方面将公共隧道建立相关的信息发送至无线接入网设备，以建立UPF与无线接入网设备之间的、基于预留方式的公共隧道。其中，公共隧道建立相关的信息可包括隧道标识(隧道ID)、对端IP地址等等。
可以理解，所述SMF接收PCF发送的第二策略信息之前，所述方法还包括：所述SMF基于预先配置的方式选择PCF；或者，所述SMF接收AMF发送的指示信息，基于所述指示信息选择PCF；相应的，所述SMF接收PCF发送的第二策略信息，包括：所述SMF与选择的PCF进行第一信息交互，基于所述第一信息交互获得所述PCF发送的所述第二策略信息。
可以理解，所述SMF接收UDM发送的签约信息，包括：所述SMF与所述UDM进行第二信息交互；基于所述第二信息交互获得所述UDM发送的签约信息。
相对于上述实施例中发起建立基于预留方式的公共隧道，本公开实施例还公开了发起释放所述公共隧道的技术方案，与公共隧道的建立方式相对应的，本实施例中可通过设备级消息或用户消息发起释放所述公共隧道。则在本公开的一种可选实施例中，所述方法还包括：所述第一核心网设备通过核心网设备之间的第二设备级消息，发起释放所述公共隧道；或者，第一核心网设备通过对应于任意终端设备的第二用户消息，发起释放所述公共隧道。其中，所述第二用户消息为核心网设备间传输的、对应于任意终端设备的用户消息。
与上述发起建立基于预留方式的公共隧道的方式相似，本实施例中也可通过设备级消息或用户消息发起释放所述公共隧道。作为第一种实施方式，第一核心网设备可通过第二设备级消息发起释放所述公共隧道。可以理解，在满足公共隧道释放条件的情况下，通过某一核心网设备(该核心 网设备可以是所述第一核心网设备自身，也可以是其他核心网设备)发起释放所述公共隧道，由所述第一核心网设备通过核心网设备之间的信息交互释放所述公共隧道。
作为第二种实施方式，第一核心网设备还可通过对应于任意终端设备的第二用户消息的方式发起释放所述公共隧道。即在任意终端设备的已有的用户消息基础上，通过“搭便车”的方式，在已有的用户消息中添加用于请求释放所述公共隧道的信息。
在本公开的一种可选实施例中，所述第一核心网设备通过核心网设备之间的第二设备级消息，发起释放所述公共隧道，包括：所述SMF检测到满足公共隧道释放条件时，通过第二设备级消息分别指示公共隧道相关联的UPF和无线接入网设备释放所述公共隧道；所述第二设备级消息中包括用于释放所述公共隧道的指示信息。
其中，所述通过所述第二设备级消息分别指示公共隧道相关联的UPF和无线接入网设备释放所述公共隧道，包括：所述SMF通过第二设备级消息分别指示UPF和无线接入网设备释放所述公共隧道的资源；所述SMF与AMF进行第四信息交互，所述第四信息交互用于所述SMF与所述AMF同步PDU会话释放的会话管理上下文。
在本公开的一种可选实施例中，所述第一核心网设备通过对应于终端设备的第二用户消息，发起释放所述公共隧道，包括：所述SMF接收到对应于任意终端设备的第二用户消息，在所述第二消息中包括公共隧道释放请求的情况下，发起释放所述公共隧道；或者，所述SMF检测到满足公共隧道释放条件，或者满足预先保存的配置信息的情况下，通过对应于所述任意终端设备的第二用户消息发起释放所述公共隧道。
其中，所述SMF接收到对应于终端设备的第二用户消息，包括：所述SMF接收来自任意终端设备的第二用户消息；所述第二用户消息由所述任 意终端设备发出、经所述AMF到达所述SMF；或者，所述SMF接收PCF发送的第二用户消息；或者，所述SMF接收AMF发送的第二用户消息；或者，所述SMF接收无线接入网设备发送的第二用户消息；所述第二用户消息由所述无线接入网设备发出、经AMF到达所述SMF。
其中，所述发起释放所述公共隧道，包括：所述SMF在对应于任意终端设备的信息交互过程中、通过用户消息分别指示与所述公共隧道相关联的UPF和无线接入网设备释放所述公共隧道。
本公开实施例中，所述SMF检测到满足公共隧道释放条件，包括：所述SMF检测到所述公共隧道相关联的所有终端设备处于下线状态时，启动定时器；在所述定时器的定时时间超时之前，确定没有终端设备使用所述公共隧道的情况下，满足公共隧道释放条件。
本实施例中所述定时器的定时时长可通过预先约定的方式确定，或者通过人工配置的方式确定，或者通过其他网络设备进行配置。其中，所述定时器的定时时长可以是一个具体的时长，也可以是无穷大，即表示对应的所述公共隧道永不删除。SMF检测到该公共隧道上的所有终端设备均下线(即没有任何终端设备使用该公共隧道)的情况下，启动所述定时器；若在所述定时器的定时时间到之前，有终端设备上线，则所述定时器清零并关闭所述定时器；若在所述定时器的定时时间超时之前仍未有其他终端设备上线，则确定满足所述公共隧道释放条件，可采用上述设备级消息或用户消息的方式释放所述公共隧道。
在本公开的一种可选实施例中，在所述第二用户消息由终端设备发出、PCF发出或无线接入网设备发出的情况下，所述方法还包括：所述SMF与AMF进行第五信息交互，所述第五信息交互用于所述SMF与所述AMF同步PDU会话释放的会话管理上下文。
采用本公开实施例的技术方案，通过核心网设备发起建立基于预留方 式的公共隧道的方式实现对隧道的复用，终端设备的上线/下线对该预留方式的公共隧道的建立或释放并无影响，仅在满足上述公共隧道释放条件的情况下才对该预留方式的公共隧道进行释放，避免了隧道的反复建立和删除所带来的信令资源消耗，从而提高了资源利用率，减少资源的空闲和浪费。
下面结合具体的应用场景和示例对本公开实施例的隧道复用方法进行详细说明。
针对基于预留方式的公共隧道的建立，本公开实施例中包括以下两种示例：
隧道建立示例一
图4为本公开实施例的隧道复用方法的流程示意图二。本示例为采用对应于任意终端设备的用户消息的方式发起建立基于预留方式的公共隧道，本实施例中的用户消息为任意终端设备在发起建立PDU会话的交互流程中所使用的用户消息。如图4所示，所述方法包括：
步骤301：UE向AMF发送PDU会话建立请求；
步骤302：AMF进行SMF选择；
步骤303：AMF发送SMF创建PDU会话管理的上下文请求(也可以称为Nsmf_PDUSession_CreateSMContext Request)消息给SMF；
步骤304：SMF与UDM交互会话管理订阅数据，用于订阅检索/订阅更新；
步骤305：SMF发送SMF创建PDU会话管理的上下文响应(也可称为Nsmf_PDUSession_CreateSMContext Response)消息给AMF；
步骤306：初次建立PDU会话期间的PDU会话验证/授权。
步骤307a至步骤307b：SMF进行PCF选择；SMF可以执行SM策略关联建立过程，或者，SMF可以发起SM策略关联修改；
步骤308：SMF选择UPF；其中，SMF可根据UPF的位置、DNN、权重信息等选择UPF；
步骤309：SMF可以执行SMF发起的SM策略关联修改过程；
步骤310a至步骤310b：SMF向UPF发送N4会话建立/修改请求，UPF向SMF发送N4会话建立/修改响应；
步骤311：SMF向AMF发送用于N1N2通信的传输消息(也可称为Namf_Communication_N1N2Message Transfer消息)；
步骤312：AMF向RAN发送N2PDU会话请求，携带NAS消息(NAS msg)；
步骤313：RAN与UE之间发起接入特别资源流程，携带PDU会话建立接受消息；RAN为UE分配AN Tunnel Info，且PDU会话建立成功；
步骤314：RAN响应N2PDU会话响应消息给AMF，携带原因值和AN Tunnel Info等；
步骤315：AMF向SMF发送SMF更新PDU会话管理的上下文请求(其也可以称为Nsmf_PDUSession_UpdateSMContext请求，其携带SM上下文ID、N2 SM信息、请求类型)，AMF将从RAN接收到的N2 SM信息(携带AN Tunnel Info等)转发给SMF；
步骤316a至步骤316c：SMF向UPF发送N4会话修改请求；UPF向SMF发送N4会话修改响应；SMF向UPF提供隧道信息以及相应的转发规则。SMF和UDM进行信息交互，完成注册；
步骤317：SMF向AMF发送SMF更新PDU会话管理上下文响应(其也可以记为Nsmf_PDUSession_UpdateSMContext Response)消息给AMF；
步骤318：SMF向AMF发送SMF PDU会话管理上下文状态通知；
步骤319：SMF进行IPv6地址配置；
步骤320：SMF和UDM进行信息交互，取消订阅。
本实施例各步骤的具体说明可参照前述图2中步骤101至步骤120的详细说明，这里不再赘述。
区别在于，本实施例中，在建立基于预留方式的公共隧道的是由任意终端设备发起的情况下，则在本实施例步骤301中，在UE发起PDU会话建立请求时，所述PDU会话建立请求中携带请求建立基于预留方式的公共隧道的相关信息，例如可在PDU会话建立请求携带隧道复用信息。在建立基于预留方式的公共隧道的是由其他核心网设备(例如AMF)发起的情况下，则在本实施例步骤303中，在AMF向SMF发送的消息中携带请求建立基于预留方式的公共隧道的相关信息，例如可携带隧道复用信息。
本实施例中，SMF可依据(A)SMF本地配置、(B)PCF策略下发、(C)UDM签约下发的方式，确定隧道复用策略。
其中，本实施例步骤304中，SMF与UDM交互获得签约信息，所述签约信息中可包括用户群标识，以及使用公共隧道的信息，对应条件C的UDM签约下发的方式。SMF可以本地配置相关信息，来进行隧道复用，对应条件A的基于SMF本地配置的方式。
本实施例步骤307中，SMF根据AMF的指示或本地配置选择PCF，此时PCF可以下发相关策略，包括用户群消息，以及是否使用共享隧道，对应条件B的PCF策略下发的方式。
步骤311中，SMF将公共隧道的相关信息与AMF进行交互，并基于以上条件A\B\C三个粒度决策是否建立基于预留方式的公共隧道。
步骤313中，RAN分配AN Tunnel info，并将其带给UE。
步骤314中，RAN将AN Tunnel info发送给AMF。
步骤315和步骤316a中，AMF将AN Tunnel info转发给SMF，SMF转发给UPF。
通过以上步骤，建立了基于预留方式的公共隧道。
隧道建立示例二
图5为本公开实施例的隧道复用方法的流程示意图三。本示例为采用对应于设备级消息的方式发起建立基于预留方式的公共隧道。如图5所示，所述方法包括：
步骤401：AMF进行SMF选择；
步骤402：AMF发送SMF创建PDU会话管理的上下文请求(也可以称为Nsmf_PDUSession_CreateSMContext Request)消息给SMF；
步骤403：SMF发送SMF创建PDU会话管理的上下文响应(也可称为Nsmf_PDUSession_CreateSMContext Response)消息给AMF；
步骤404a至步骤404b：SMF进行PCF选择；SMF可以发起SM策略关联修改；
步骤405：SMF选择UPF；
步骤406：SMF可以执行SMF发起的SM策略关联修改过程；
步骤407a至步骤407b：SMF向UPF发送N4会话建立/修改请求，UPF向SMF发送N4会话建立/修改响应；
步骤408：SMF向AMF发送用于N1N2通信的传输消息(也可称为Namf_Communication_N1N2Message Transfer消息)；
步骤409：AMF向RAN发送N2PDU会话请求，携带NAS消息(NAS msg)；
步骤410：RAN向AMF发送N2PDU会话响应；
步骤411：AMF向SMF发送SMF更新PDU会话管理的上下文请求(其也可以称为Nsmf_PDUSession_UpdateSMContext请求)；
步骤412a至步骤412b：SMF向UPF发送N4会话修改请求；UPF向SMF发送N4会话修改响应；
步骤413：SMF向AMF发送SMF更新PDU会话管理上下文响应(其 也可以记为Nsmf_PDUSession_UpdateSMContext Response)消息给AMF；
步骤414：SMF向AMF发送SMF PDU会话管理上下文状态通知。
本实施例可通过核心网设备发起建立基于预留方式的公共隧道。在由AMF发起建立基于预留方式的公共隧道的情况下，则在步骤401中，AMF检测到满足公共隧道建立条件，主动发起基于预留方式的公共隧道的建立，并选择SMF，在步骤402中，AMF向SMF发送的消息中携带建立基于预留方式的公共隧道的相关信息。在由SMF发起建立基于预留方式的公共隧道的情况下，也可由SMF检测到满足公共隧道建立条件，主动发起基于预留方式的公共隧道的建立，并选择UPF，即跳过步骤401至步骤404，直接执行步骤405。
本实施例中，SMF可依据(A)SMF本地配置、(B)PCF策略下发、(C)UDM签约下发的方式，确定隧道复用策略。
其中，本实施例步骤402至步骤403中，SMF可根据本地配置的方式(对应条件A)决定用户(即待使用公共隧道的终端设备)与公共隧道之间的对应关系，并在后续消息中将此对应关系传递给RAN和UPF。
本实施例步骤404中，SMF根据AMF的指示或本地配置选择PCF，此时PCF可以下发相关策略，包括用户群消息，以及使用何种共享隧道(例如该公共隧道是对应于何种业务的公共隧道，或者公共隧道时对应何种用户群的公共隧道等等)，对应条件B的PCF策略下发的方式。
步骤407中，SMF与UPF之间交互公共隧道建立的相关信息，并进行订阅信息的交互。
步骤410中，RAN将AN Tunnel info发送给AMF。
步骤411和步骤412a中，AMF将AN Tunnel info转发给SMF，SMF转发给UPF。
针对上述公共隧道的释放，本公开实施例中包括以下两种示例：
隧道释放示例一
图6为本公开实施例的隧道复用方法的流程示意图四。本示例为采用对应于设备级消息的方式发起释放公共隧道。如图6所示，所述方法包括：
步骤501a至步骤501b：SMF向UPF发送N4会话释放请求(N4 Session Release Request)；UPF向SMF发送N4会话释放响应(N4 Session Release Response)；
步骤502：SMF与AMF之间进行N1N2通信消息传输(Nsmf Communication N1N2 Message Transfer)消息；
步骤503：AMF向RAN发送N2资源释放请求(N2 Resuorce Release Request)；
步骤504：RAN向UE进行接入特别资源修改(AN specific resource modification)，包括PDU会话释放命令(PDU Session Release Command)；
步骤505：RAN向AMF发送N2资源释放确认(N2 Resuorce Release ACK)；
步骤506a至步骤506b：AMF向SMF发送更新PDU会话管理上下文N2会话管理消息(Nsmf PDU Session UpdateSMContext N2 SM info)，获得SMF响应PDU会话管理上下文消息(Nsmf PDU Session UpdateSMContext Response)；
步骤507：UE向RAN发送PDU会话释放确认(PDU Session Release ACK)；
步骤508：RAN向AMF发送N2资源释放确认(N2 Resuorce Release ACK)；
步骤509a至步骤509b：AMF向SMF发送更新PDU会话管理上下文N1会话管理消息(Nsmf PDU Session UpdateSMContext N1SM info)，获得SMF响应PDU会话管理上下文消息(Nsmf PDU Session UpdateSMContext  Response)；
步骤510：AMF与SMF交互PDU会话管理上下文状态通知(释放状态)(Nsmf_PDUSession_SMContextStatusNotify(Release))；其中，通知消息中需携带SMF标识(SMF ID)、PDU会话标识、DNN和S-NSSAI；
步骤511：SMF与PCF进行信息交互，终止会话管理策略关联(SM Policy Association Termination)。
本实施例可通过核心网设备发起释放基于预留方式建立的公共隧道。本示例中以SMF发起释放基于预留方式建立的公共隧道为例，当然本实施例中不限于此，也可通过其他核心网设备(例如AMF)发起释放基于预留方式建立的公共隧道。
隧道释放示例二
图7为本公开实施例的隧道复用方法的流程示意图五。本示例为采用对应于任意终端设备的用户消息的方式发起释放基于预留方式的公共隧道，本实施例中的用户消息为任意终端设备在发起释放PDU会话的交互流程中所使用的用户消息。如图7所示，所述方法包括：
步骤601a至步骤601e分别为由UE、PCF、AMF、RAN和SMF发起公共隧道释放；其中，步骤601a表示由UE发送的PDU会话释放请求消息中携带公共隧道释放信息，该PDU会话释放请求消息发送至AMF，由AMF向SMF发送更新PDU会话管理上下文消息，所述更新PDU会话管理上下文消息中包括所述PDU会话释放请求；步骤601b表示由PCF发送至SMF的SM策略关联终止消息中携带公共隧道释放信息；步骤601c表示由AMF向SMF发送的释放PDU会话管理上下文消息中携带公共隧道释放信息；步骤601d表示由RAN发送的N2消息中携带公共隧道释放信息，N2消息发送至AMF，由AMF向SMF发送更新PDU会话管理上下文消息中携带公共隧道释放信息；步骤601e表示由SMF执行PDU会话释放触发，即触 发公共隧道释放。
步骤601f：AMF向SMF发送更新PDU会话管理上下文。
步骤602a至步骤602b：SMF向UPF发送N4会话释放请求(N4 Session Release Request)；UPF向SMF发送N4会话释放响应(N4 Session Release Response)；
步骤603a至步骤603d：SMF向AMF发送更新PDU会话管理上下文响应消息；AMF与SMF进行N1N2通信消息传输(Nsmf Communication N1N2 Message Transfer)消息；SMF向AMF发送PDU会话管理上下文释放响应消息；SMF向AMF发送更新PDU会话管理上下文响应消息；
步骤604：AMF向RAN发送N2资源释放请求(N2 Resuorce Release Request)；
步骤605：RAN向UE进行接入特别资源修改(AN specific resource modification)，包括PDU会话释放命令(PDU Session Release Command)；
步骤606：RAN向AMF发送N2资源释放确认(N2 Resuorce Release ACK)；
步骤607a至步骤607b：AMF向SMF发送更新PDU会话管理上下文N2会话管理消息(Nsmf PDU Session UpdateSMContext N2 SM info)，获得SMF响应PDU会话管理上下文消息(Nsmf PDU Session UpdateSMContext Response)；
步骤608：UE向RAN发送PDU会话释放确认(PDU Session Release ACK)；
步骤609：RAN向AMF发送N2上行链路NAS传输(N2 Uplink NAS transport)消息；
步骤610a至步骤610b：AMF向SMF发送SMF更新PDU会话管理的上下文请求(其也可以称为Nsmf_PDUSession_UpdateSMContext请求)； SMF向AMF发送SMF更新PDU会话管理上下文响应(其也可以记为Nsmf_PDUSession_UpdateSMContext Response)消息给AMF；
步骤611：AMF与SMF交互PDU会话管理上下文状态通知(释放状态)(Nsmf_PDUSession_SMContextStatusNotify(Release))；
步骤612：SMF与PCF进行信息交互，终止会话管理策略关联(SM Policy Association Termination)。
本实施例中各步骤的详细阐述具体可参照已有的PDU会话释放流程的具体描述，这里不再赘述。区别在于，本实施例中，在决定释放基于预留方式的公共隧道时，可通过对应于任意终端设备的用户消息的方式(即“搭便车”方式)，在以有流程中的任意用户消息中添加用于释放公共隧道的信息，从而实现基于预留方式的公共隧道的释放。
基于此，本实施例中可参照步骤601a至步骤601e所示，分别表示由UE、PCF、AMF、RAN和SMF发起基于预留方式的公共隧道的释放，可通过在已有的用户消息中添加隧道删除信息；所述隧道删除信息中可包括隧道标识(隧道ID)和对应的删除指示。
本实施例步骤611中，如果是由UE、PCF或RAN发起的隧道释放流程，则SMF需将PDU会话释放的会话管理上下文通知给AMF，其中，通知的消息中携带SMF标识(SMF ID)、PDU会话标识(PDU session ID)、DNN和S-NSSAI。
本实施例步骤612中，如果部署了动态PCC规则，SMF还需通知PCF此会话的策略控制功能被终止。
本公开实施例还提供了一种核心网设备，所述核心网设备为第一核心网设备。图8为本公开实施例的核心网设备的组成结构示意图一；如图8所示，所述设备包括：获取单元71和发起单元72；其中，
所述获取单元71，配置为获得特定消息；
所述发起单元72，配置为基于所述获取单元71获得的特定消息，发起建立基于预留方式的公共隧道，所述基于预留方式的公共隧道用于在隧道建立完成后上线的相关终端设备使用；所述公共隧道支持多个终端设备复用。
所述获取单元71，配置为获得核心网设备之间的第一设备级消息；或者配置为获得对应于终端设备的第一用户消息；
所述发起单元72，配置为通过所述获取单元71获得的所述第一设备级消息，发起建立基于预留方式的公共隧道；或者配置为通过所述获取单元71获得的第一用户消息，发起建立基于预留方式的公共隧道。其中，所述第一用户消息为核心网设备间传输的对应于任意终端设备的消息。
在本公开的一种可选实施例中，所述第一核心网设备为SMF；所述发起单元72，配置为检测到满足建立公共隧道的条件时，通过核心网设备之间的第一设备级消息发起建立基于预留方式公共隧道；或者，接收到AMF发送的第一设备级消息，基于所述第一设备级消息发起建立基于预留方式的公共隧道；其中，所述第一设备级消息中包括用于建立基于预留方式的公共隧道的指示信息；所述第一设备级消息在所述AMF检测到满足建立公共隧道的条件时发送。
在本公开的一种可选实施例中，所述第一核心网设备为SMF；所述发起单元72，配置为在任意终端设备对应的信息交互过程中，通过所述信息交互过程中的第一用户消息发起建立公共隧道。
作为一种实施方式，所述发起单元72，配置为检测到满足公共隧道建立条件的情况下，通过对应于任意终端设备的第一用户消息发起建立公共隧道；或者，
所述设备还包括通讯单元73，配置为接收对应于任意终端设备的第一用户消息；
所述发起单元72，配置为在所述通讯单元73接收到的所述第一用户消息中包括公共隧道建立请求的情况下，发起建立基于预留方式的公共隧道；其中，所述第一用户消息由其他核心网设备发出、或者由任意终端设备发出、或者由无线接入网设备发出。
在本公开的一种可选实施例中，如图9所示，所述设备还包括存储单元74或通讯单元73；
其中，所述存储单元74，配置为存储第一策略信息；
所述通讯单元73，配置为接收PCF发送的第二策略信息；或者，接收UDM发送的签约信息；
所述发起单元72，配置为基于所述存储单元74存储的所述第一策略信息发起建立基于预留方式的公共隧道；或者，基于所述通讯单元73接收的所述第二策略信息发起建立基于预留方式的公共隧道；或者，基于所述通讯单元73接收的所述签约信息发起建立基于预留方式的公共隧道。
在本公开的一种可选实施例中，如图10所示，所述设备还包括第一选择单元75，配置为所述通讯单元73接收PCF发送的第二策略信息之前，基于预先配置的方式选择PCF；或者，
所述通讯单元73，还配置为接收AMF发送的指示信息；
所述第一选择单元75，配置为基于所述通讯单元73接收的所述指示信息选择PCF；
所述通讯单元73，还配置为与所述第一选择单元75选择的PCF进行第一信息交互，基于所述第一信息交互获得所述PCF发送的所述第二策略信息。
在本公开的一种可选实施例中，所述通讯单元73，配置为与所述UDM进行第二信息交互；基于所述第二信息交互获得所述UDM发送的签约信息。
在本公开的一种可选实施例中，如图11所示，所述设备还包括第二选择单元76，配置为选择UPF；
所述发起单元72，配置为通过所述通讯单元73与所述第二选择单元76选择的UPF进行第三信息交互；所述第三信息交互用于将所述第一策略信息、所述第二策略信息或所述签约信息发送至选择的UPF；所述第一策略信息、所述第二策略信息或所述签约信息用于所述UPF建立与无线接入网设备之间的所述公共隧道。
在本公开的一种可选实施例中，如图12所示，所述设备还包括释放单元77，配置为通过核心网设备之间的第二设备级消息，发起释放所述公共隧道；或者，通过对应于任意终端设备的第二用户消息，发起释放所述公共隧道。
在本公开的一种可选实施例中，所述第一核心网设备为SMF；所述释放单元77，配置为检测到满足公共隧道释放条件时，通过第二设备级消息分别指示公共隧道相关联的UPF和无线接入网设备释放所述公共隧道；所述第二设备级消息中包括用于释放所述公共隧道的指示信息。
在本公开的一种可选实施例中，所述释放单元77，配置为通过第二设备级消息分别指示UPF和无线接入网设备释放所述公共隧道的资源；还配置为与AMF进行第四信息交互，所述第四信息交互用于所述SMF与所述AMF同步PDU会话释放的会话管理上下文。
在本公开的一种可选实施例中，所述第一核心网设备为SMF；所述设备还包括通讯单元73，配置为接收对应于任意终端设备的第二用户消息；
所述释放单元77，配置为在所述通讯单元73接收到的所述第二消息中包括公共隧道释放请求的情况下，发起释放所述公共隧道；或者，检测到满足公共隧道释放条件，或者满足预先保存的配置信息的情况下，通过对应于所述任意终端设备的第二用户消息发起释放所述公共隧道。
在本公开的一种可选实施例中，所述通讯单元73，配置为接收来自任意终端设备的第二用户消息；所述第二用户消息由所述任意终端设备发出、经所述AMF到达所述SMF；或者，接收PCF发送的第二用户消息；或者，接收AMF发送的第二用户消息；或者，接收无线接入网设备发送的第二用户消息；所述第二用户消息由所述无线接入网设备发出、经AMF到达所述SMF。
在本公开的一种可选实施例中，所述释放单元77，配置为在对应于任意终端设备的信息交互过程中、通过用户消息分别指示与所述公共隧道相关联的UPF和无线接入网设备释放所述公共隧道。
在本公开的一种可选实施例中，在所述第二用户消息由终端设备发出、PCF发出或无线接入网设备发出的情况下，所述通讯单元73，还配置为与AMF进行第五信息交互，所述第五信息交互用于所述SMF与所述AMF同步PDU会话释放的会话管理上下文。
在本公开的一种可选实施例中，所述释放单元77，配置为检测到所述公共隧道相关联的所有终端设备处于下线状态时，启动定时器；在所述定时器的定时时间超时之前，确定没有终端设备使用所述公共隧道的情况下，发起释放所述公共隧道。
本实施例中，所述公共隧道为对应于业务、用户组、网络切片或DNN的公共隧道。
本公开实施例中，所述设备中的第一选择单元75和第二选择单元76，在实际应用中均可由所述设备中的中央处理器(CPU，Central Processing Unit)、数字信号处理器(DSP，Digital Signal Processor)、微控制单元(MCU，Microcontroller Unit)或可编程门阵列(FPGA，Field－Programmable Gate Array)实现；所述设备中的通讯单元73，在实际应用中可通过通信模组(包含：基础通信套件、操作系统、通信模块、标准化接口和协议等)及收发 天线实现；所述设备中的存储单元74，在实际应用中可由存储器实现；所述设备中的获取单元71、发起单元72和释放单元77，在实际应用中均可由CPU、DSP、MCU或FPGA结合通信模组(包含：基础通信套件、操作系统、通信模块、标准化接口和协议等)及收发天线实现。
需要说明的是：上述实施例提供的核心网设备在进行隧道复用时，仅以上述各程序模块的划分进行举例说明，实际应用中，可以根据需要而将上述处理分配由不同的程序模块完成，即将核心网设备的内部结构划分成不同的程序模块，以完成以上描述的全部或者部分处理。另外，上述实施例提供的核心网设备与隧道复用方法实施例属于同一构思，其具体实现过程详见方法实施例，这里不再赘述。
本公开实施例还提供了一种核心网设备。图13为本公开实施例的核心网设备的硬件组成结构示意图，如图13所示，所述核心网设备80包括存储器82、处理器81及存储在存储器82上并可在处理器81上运行的计算机程序，所述处理器81执行所述计算机程序时实现本公开实施例上述方法的步骤。
可以理解，核心网设备中还包括通讯接口83。核心网设备中的各个组件可通过总线系统84耦合在一起。可理解，总线系统84用于实现这些组件之间的连接通信。总线系统84除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图13中将各种总线都标为总线系统84。
可以理解，存储器82可以是易失性存储器或非易失性存储器，也可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(ROM，Read Only Memory)、可编程只读存储器(PROM，Programmable Read-Only Memory)、可擦除可编程只读存储器(EPROM，Erasable Programmable Read-Only Memory)、电可擦除可编程只读存储器(EEPROM， Electrically Erasable Programmable Read-Only Memory)、磁性随机存取存储器(FRAM，Ferromagnetic Random Access Memory)、快闪存储器(Flash Memory)、磁表面存储器、光盘、或只读光盘(CD-ROM，Compact Disc Read-Only Memory)；磁表面存储器可以是磁盘存储器或磁带存储器。易失性存储器可以是随机存取存储器(RAM，Random Access Memory)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(SRAM，Static Random Access Memory)、同步静态随机存取存储器(SSRAM，Synchronous Static Random Access Memory)、动态随机存取存储器(DRAM，Dynamic Random Access Memory)、同步动态随机存取存储器(SDRAM，Synchronous Dynamic Random Access Memory)、双倍数据速率同步动态随机存取存储器(DDRSDRAM，Double Data Rate Synchronous Dynamic Random Access Memory)、增强型同步动态随机存取存储器(ESDRAM，Enhanced Synchronous Dynamic Random Access Memory)、同步连接动态随机存取存储器(SLDRAM，SyncLink Dynamic Random Access Memory)、直接内存总线随机存取存储器(DRRAM，Direct Rambus Random Access Memory)。本公开实施例描述的存储器82旨在包括但不限于这些和任意其它适合类型的存储器。
上述本公开实施例揭示的方法可以应用于处理器81中，或者由处理器81实现。处理器81可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法的各步骤可以通过处理器81中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器81可以是通用处理器、DSP，或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。处理器81可以实现或者执行本公开实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本公开实施例所公开的方法的步骤，可以直接体现为硬件译码处理器执行完成， 或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于存储介质中，该存储介质位于存储器82，处理器81读取存储器82中的信息，结合其硬件完成前述方法的步骤。
在示例性实施例中，核心网设备可以被一个或多个应用专用集成电路(ASIC，Application Specific Integrated Circuit)、DSP、可编程逻辑器件(PLD，Programmable Logic Device)、复杂可编程逻辑器件(CPLD，Complex Programmable Logic Device)、FPGA、通用处理器、控制器、MCU、微处理器(Microprocessor)、或其他电子元件实现，用于执行前述方法。
在示例性实施例中，本公开实施例还提供了一种计算机可读存储介质，例如包括计算机程序的存储器82，上述计算机程序可由核心网设备80的处理器81执行，以完成前述方法所述步骤。计算机可读存储介质可以是FRAM、ROM、PROM、EPROM、EEPROM、Flash Memory、磁表面存储器、光盘、或CD-ROM等存储器。
本公开实施例还提供了一种计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行时实现本公开实施例所述方法的步骤。
在本申请所提供的几个实施例中，应该理解到，所揭露的设备和方法，可以通过其它的方式实现。以上所描述的设备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，如：多个单元或组件可以结合，或可以集成到另一个系统，或一些特征可以忽略，或不执行。另外，所显示或讨论的各组成部分相互之间的耦合、或直接耦合、或通信连接可以是通过一些接口，设备或单元的间接耦合或通信连接，可以是电性的、机械的或其它形式的。
上述作为分离部件说明的单元可以是、或也可以不是物理上分开的，作为单元显示的部件可以是、或也可以不是物理单元，即可以位于一个地方，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 或全部单元来实现本实施例方案的目的。
另外，在本公开各实施例中的各功能单元可以全部集成在一个处理单元中，也可以是各单元分别单独作为一个单元，也可以两个或两个以上单元集成在一个单元中；上述集成的单元既可以采用硬件的形式实现，也可以采用硬件加软件功能单元的形式实现。
本领域普通技术人员可以理解：实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成，前述的程序可以存储于一计算机可读取存储介质中，该程序在执行时，执行包括上述方法实施例的步骤；而前述的存储介质包括：移动存储设备、ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
或者，本公开上述集成的单元如果以软件功能模块的形式实现并作为独立的产品销售或使用时，也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，本公开实施例的技术方案本质上或者说对现有技术做出贡献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)执行本公开各个实施例所述方法的全部或部分。而前述的存储介质包括：移动存储设备、ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本公开的具体实施方式，但本公开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公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (40)

  1. 一种隧道复用方法，所述方法包括：
    第一核心网设备基于获得的特定消息，发起建立基于预留方式的公共隧道，所述基于预留方式的公共隧道用于在隧道建立完成后上线的相关终端设备使用；所述公共隧道支持多个终端设备复用。
  2. 根据权利要求1所述的方法，其中，所述第一核心网设备基于获得的特定消息，发起建立基于预留方式的公共隧道，包括：
    第一核心网设备通过核心网设备之间的第一设备级消息，发起建立基于预留方式的公共隧道；或者，
    第一核心网设备通过对应于终端设备的第一用户消息，发起建立基于预留方式的公共隧道。
  3. 根据权利要求2所述的方法，其中，所述第一核心网设备为会话管理功能SMF；所述第一核心网设备通过核心网设备之间的第一设备级消息，发起建立基于预留方式的公共隧道，包括：
    SMF检测到满足建立公共隧道的条件时，通过核心网设备之间的第一设备级消息发起建立基于预留方式公共隧道；或者，
    SMF接收到接入及移动性管理功能AMF发送的第一设备级消息，基于所述第一设备级消息发起建立基于预留方式的公共隧道；其中，所述第一设备级消息中包括用于建立基于预留方式的公共隧道的指示信息；所述第一设备级消息在所述AMF检测到满足建立公共隧道的条件时发送。
  4. 根据权利要求2所述的方法，其中，所述第一用户消息为核心网设备间传输的对应于任意终端设备的消息。
  5. 根据权利要求2所述的方法，其中，所述第一核心网设备为SMF；所述第一核心网设备通过对应于终端设备的第一用户消息，发起建立基于预留方式的公共隧道，包括：
    在任意终端设备对应的信息交互过程中，所述SMF通过所述信息交互过程中的第一用户消息发起建立公共隧道。
  6. 根据权利要求5所述的方法，其中，所述SMF通过所述信息交互过程中的第一用户消息发起建立公共隧道，包括：
    所述SMF检测到满足公共隧道建立条件的情况下，通过对应于任意终端设备的第一用户消息发起建立公共隧道；或者，
    所述SMF接收到对应于任意终端设备的第一用户消息，在所述第一用户消息中包括公共隧道建立请求的情况下，发起建立基于预留方式的公共隧道；
    其中，所述第一用户消息由其他核心网设备发出、或者由任意终端设备发出、或者由无线接入网设备发出。
  7. 根据权利要求1所述的方法，其中，所述第一核心网设备为SMF；所述发起建立基于预留方式的公共隧道，包括：
    所述SMF基于本地保存的第一策略信息发起建立基于预留方式的公共隧道；或者，
    所述SMF接收策略控制功能PCF发送的第二策略信息，基于所述第二策略信息发起建立基于预留方式的公共隧道；或者，
    所述SMF接收统一数据管理功能UDM发送的签约信息，基于所述签约信息发起建立基于预留方式的公共隧道。
  8. 根据权利要求7所述的方法，其中，所述SMF接收PCF发送的第二策略信息之前，所述方法还包括：
    所述SMF基于预先配置的方式选择PCF；或者，所述SMF接收AMF发送的指示信息，基于所述指示信息选择PCF；
    相应的，所述SMF接收PCF发送的第二策略信息，包括：所述SMF与选择的PCF进行第一信息交互，基于所述第一信息交互获得所述PCF发 送的所述第二策略信息。
  9. 根据权利要求7所述的方法，其中，所述SMF接收UDM发送的签约信息，包括：
    所述SMF与所述UDM进行第二信息交互；基于所述第二信息交互获得所述UDM发送的签约信息。
  10. 根据权利要求7所述的方法，其中，所述发起建立基于预留方式的公共隧道，包括：
    所述SMF选择UPF，与选择的UPF进行第三信息交互；所述第三信息交互用于将所述第一策略信息、所述第二策略信息或所述签约信息发送至选择的UPF；所述第一策略信息、所述第二策略信息或所述签约信息用于所述UPF建立与无线接入网设备之间的所述公共隧道。
  11. 根据权利要求1至10任一项所述的方法，其中，所述方法还包括：
    所述第一核心网设备通过核心网设备之间的第二设备级消息，发起释放所述公共隧道；或者，
    第一核心网设备通过对应于任意终端设备的第二用户消息，发起释放所述公共隧道。
  12. 根据权利要求11所述的方法，其中，所述第一核心网设备为SMF；所述第一核心网设备通过核心网设备之间的第二设备级消息，发起释放所述公共隧道，包括：
    所述SMF检测到满足公共隧道释放条件时，通过第二设备级消息分别指示公共隧道相关联的UPF和无线接入网设备释放所述公共隧道；所述第二设备级消息中包括用于释放所述公共隧道的指示信息。
  13. 根据权利要求12所述的方法，其中，所述通过所述第二设备级消息分别指示公共隧道相关联的UPF和无线接入网设备释放所述公共隧道，包括：
    所述SMF通过第二设备级消息分别指示UPF和无线接入网设备释放所述公共隧道的资源；
    所述SMF与AMF进行第四信息交互，所述第四信息交互用于所述SMF与所述AMF同步PDU会话释放的会话管理上下文。
  14. 根据权利要求11所述的方法，其中，所述第一核心网设备为SMF；所述第一核心网设备通过对应于终端设备的第二用户消息，发起释放所述公共隧道，包括：
    所述SMF接收到对应于任意终端设备的第二用户消息，在所述第二消息中包括公共隧道释放请求的情况下，发起释放所述公共隧道；或者，
    所述SMF检测到满足公共隧道释放条件，或者满足预先保存的配置信息的情况下，通过对应于所述任意终端设备的第二用户消息发起释放所述公共隧道。
  15. 根据权利要求14所述的方法，其中，所述SMF接收到对应于终端设备的第二用户消息，包括：
    所述SMF接收来自任意终端设备的第二用户消息；所述第二用户消息由所述任意终端设备发出、经所述AMF到达所述SMF；或者，
    所述SMF接收PCF发送的第二用户消息；或者，
    所述SMF接收AMF发送的第二用户消息；或者，
    所述SMF接收无线接入网设备发送的第二用户消息；所述第二用户消息由所述无线接入网设备发出、经AMF到达所述SMF。
  16. 根据权利要求14所述的方法，其中，所述发起释放所述公共隧道，包括：
    所述SMF在对应于任意终端设备的信息交互过程中、通过用户消息分别指示与所述公共隧道相关联的UPF和无线接入网设备释放所述公共隧道。
  17. 根据权利要求15所述的方法，其中，在所述第二用户消息由终端设备发出、PCF发出或无线接入网设备发出的情况下，所述方法还包括：
    所述SMF与AMF进行第五信息交互，所述第五信息交互用于所述SMF与所述AMF同步PDU会话释放的会话管理上下文。
  18. 根据权利要求12或14所述的方法，其中，所述SMF检测到满足公共隧道释放条件，包括：
    所述SMF检测到所述公共隧道相关联的所有终端设备处于下线状态时，启动定时器；
    在所述定时器的定时时间超时之前，确定没有终端设备使用所述公共隧道的情况下，满足公共隧道释放条件。
  19. 根据权利要求1至18任一项所述的方法，其中，所述公共隧道为对应于业务、用户组、网络切片或数据网络名称DNN的公共隧道。
  20. 一种核心网设备，所述核心网设备为第一核心网设备，所述设备包括：获取单元和发起单元；其中，
    所述获取单元，配置为获得特定消息；
    所述发起单元，配置为基于所述获取单元获得的特定消息，发起建立基于预留方式的公共隧道，所述基于预留方式的公共隧道用于在隧道建立完成后上线的相关终端设备使用；所述公共隧道支持多个终端设备复用。
  21. 根据权利要求20所述的设备，其中，所述获取单元，配置为获得核心网设备之间的第一设备级消息；或者配置为获得对应于终端设备的第一用户消息；
    所述发起单元，配置为通过所述获取单元获得的所述第一设备级消息，发起建立基于预留方式的公共隧道；或者配置为通过所述获取单元获得的第一用户消息，发起建立基于预留方式的公共隧道。
  22. 根据权利要求21所述的设备，其中，所述第一核心网设备为SMF； 所述发起单元，配置为检测到满足建立公共隧道的条件时，通过核心网设备之间的第一设备级消息发起建立基于预留方式公共隧道；或者，接收到AMF发送的第一设备级消息，基于所述第一设备级消息发起建立基于预留方式的公共隧道；其中，所述第一设备级消息中包括用于建立基于预留方式的公共隧道的指示信息；所述第一设备级消息在所述AMF检测到满足建立公共隧道的条件时发送。
  23. 根据权利要求21所述的设备，其中，所述第一用户消息为核心网设备间传输的对应于任意终端设备的消息。
  24. 根据权利要求21所述的设备，其中，所述第一核心网设备为SMF；所述发起单元，配置为在任意终端设备对应的信息交互过程中，通过所述信息交互过程中的第一用户消息发起建立公共隧道。
  25. 根据权利要求24所述的设备，其中，所述发起单元，配置为检测到满足公共隧道建立条件的情况下，通过对应于任意终端设备的第一用户消息发起建立公共隧道；或者，
    所述设备还包括通讯单元，配置为接收对应于任意终端设备的第一用户消息；
    所述发起单元，配置为在所述通讯单元接收到的所述第一用户消息中包括公共隧道建立请求的情况下，发起建立基于预留方式的公共隧道；其中，所述第一用户消息由其他核心网设备发出、或者由任意终端设备发出、或者由无线接入网设备发出。
  26. 根据权利要求20所述的设备，其中，所述设备还包括存储单元或通讯单元；
    其中，所述存储单元，配置为存储第一策略信息；
    所述通讯单元，配置为接收PCF发送的第二策略信息；或者，接收UDM发送的签约信息；
    所述发起单元，配置为基于所述存储单元存储的所述第一策略信息发起建立基于预留方式的公共隧道；或者，基于所述通讯单元接收的所述第二策略信息发起建立基于预留方式的公共隧道；或者，基于所述通讯单元接收的所述签约信息发起建立基于预留方式的公共隧道。
  27. 根据权利要求26所述的设备，其中，所述设备还包括第一选择单元，配置为所述通讯单元接收PCF发送的第二策略信息之前，基于预先配置的方式选择PCF；或者，
    所述通讯单元，还配置为接收AMF发送的指示信息；
    所述选择单元，配置为基于所述通讯单元接收的所述指示信息选择PCF；
    所述通讯单元，还配置为与所述第一选择单元选择的PCF进行第一信息交互，基于所述第一信息交互获得所述PCF发送的所述第二策略信息。
  28. 根据权利要求26所述的设备，其中，所述通讯单元，配置为与所述UDM进行第二信息交互；基于所述第二信息交互获得所述UDM发送的签约信息。
  29. 根据权利要求26所述的设备，其中，所述设备还包括第二选择单元，配置为选择UPF；
    所述发起单元，配置为通过所述通讯单元与所述第二选择单元选择的UPF进行第三信息交互；所述第三信息交互用于将所述第一策略信息、所述第二策略信息或所述签约信息发送至选择的UPF；所述第一策略信息、所述第二策略信息或所述签约信息用于所述UPF建立与无线接入网设备之间的所述公共隧道。
  30. 根据权利要求20至29任一项所述的设备，其中，所述设备还包括释放单元，配置为通过核心网设备之间的第二设备级消息，发起释放所述公共隧道；或者，通过对应于任意终端设备的第二用户消息，发起释放 所述公共隧道。
  31. 根据权利要求30所述的设备，其中，所述第一核心网设备为SMF；所述释放单元，配置为检测到满足公共隧道释放条件时，通过第二设备级消息分别指示公共隧道相关联的UPF和无线接入网设备释放所述公共隧道；所述第二设备级消息中包括用于释放所述公共隧道的指示信息。
  32. 根据权利要求31所述的设备，其中，所述释放单元，配置为通过第二设备级消息分别指示UPF和无线接入网设备释放所述公共隧道的资源；还配置为与AMF进行第四信息交互，所述第四信息交互用于所述SMF与所述AMF同步PDU会话释放的会话管理上下文。
  33. 根据权利要求30所述的设备，其中，所述第一核心网设备为SMF；所述设备还包括通讯单元，配置为接收对应于任意终端设备的第二用户消息；
    所述释放单元，配置为在所述通讯单元接收到的所述第二消息中包括公共隧道释放请求的情况下，发起释放所述公共隧道；或者，检测到满足公共隧道释放条件，或者满足预先保存的配置信息的情况下，通过对应于所述任意终端设备的第二用户消息发起释放所述公共隧道。
  34. 根据权利要求33所述的设备，其中，所述通讯单元，配置为接收来自任意终端设备的第二用户消息；所述第二用户消息由所述任意终端设备发出、经所述AMF到达所述SMF；或者，接收PCF发送的第二用户消息；或者，接收AMF发送的第二用户消息；或者，接收无线接入网设备发送的第二用户消息；所述第二用户消息由所述无线接入网设备发出、经AMF到达所述SMF。
  35. 根据权利要求33所述的设备，其中，所述释放单元，配置为在对应于任意终端设备的信息交互过程中、通过用户消息分别指示与所述公共隧道相关联的UPF和无线接入网设备释放所述公共隧道。
  36. 根据权利要求34所述的设备，其中，在所述第二用户消息由终端设备发出、PCF发出或无线接入网设备发出的情况下，所述通讯单元，还配置为与AMF进行第五信息交互，所述第五信息交互用于所述SMF与所述AMF同步PDU会话释放的会话管理上下文。
  37. 根据权利要求31或33所述的设备，其中，所述释放单元，配置为检测到所述公共隧道相关联的所有终端设备处于下线状态时，启动定时器；在所述定时器的定时时间超时之前，确定没有终端设备使用所述公共隧道的情况下，发起释放所述公共隧道。
  38. 根据权利要求20至37任一项所述的设备，其中，所述公共隧道为对应于业务、用户组、网络切片或DNN的公共隧道。
  39. 一种计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行时实现权利要求1至19任一项所述方法的步骤。
  40. 一种核心网设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，所述处理器执行所述程序时实现权利要求1至19任一项所述方法的步骤。
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