WO2018202008A1 - Procédé de gestion de session, appareil de réseau et système de communication - Google Patents

Procédé de gestion de session, appareil de réseau et système de communication Download PDF

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Publication number
WO2018202008A1
WO2018202008A1 PCT/CN2018/085099 CN2018085099W WO2018202008A1 WO 2018202008 A1 WO2018202008 A1 WO 2018202008A1 CN 2018085099 W CN2018085099 W CN 2018085099W WO 2018202008 A1 WO2018202008 A1 WO 2018202008A1
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WO
WIPO (PCT)
Prior art keywords
management entity
session management
pdu session
information
local
Prior art date
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PCT/CN2018/085099
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English (en)
Chinese (zh)
Inventor
朱奋勤
吴问付
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201810150678.6A external-priority patent/CN108811011B/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP18793911.1A priority Critical patent/EP3606275B1/fr
Priority to EP22164618.5A priority patent/EP4090078A3/fr
Publication of WO2018202008A1 publication Critical patent/WO2018202008A1/fr
Priority to US16/664,481 priority patent/US11706704B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections

Definitions

  • the present invention relates to the field of communications, and in particular, to a session management method, a network device, and a communication system.
  • the Session Management Function is responsible for session management, including the establishment, modification, and release of a PDU (Protocol Data Unit, PDU) session.
  • the User Plane Function is responsible for forwarding user data.
  • the technical problem to be solved by the embodiments of the present invention is to provide a session management method, a network device, and a communication system, so as to implement user plane entities managing different locations.
  • the present application provides a session management method, including selecting, by a network device, location information of a User Equipment (UE), and a PDU (Protocol Data Unit, PDU for short) session requirement information.
  • a first intermediate session management entity the network device sends the location information of the UE and the PDU session requirement information to the first intermediate session management entity, where the PDU session requirement information is used to select a user plane entity, and the first intermediate session management entity is only responsible for management designation.
  • a network element in the range (for example, an access network device or a user plane entity).
  • the PDU session requirement information indicates related parameters of the PDU session determined by the core network.
  • the network device is a device in the core network, and the network device may be an access management entity or a session management entity.
  • the access management entity is used to perform access management on the UE, and the session management entity is used to manage the session established by the UE.
  • the network device selects the intermediate session management entity according to the location information of the UE and the PDU session requirement information, so that the intermediate session management entity close to the UE can provide services for the PDU session, thereby reducing the delay of data transmission.
  • the intermediate session management entity selects the user plane entity according to the location information of the UE and the PDU requirement information, and the intermediate session management entity only manages the user plane entity in the specified range, and does not need to manage the user plane entity of the entire PDU session, thereby reducing management complexity.
  • the PDU session requirement information includes a PDU session type and/or a SSC (Session and Service Continuity, SSC) mode.
  • SSC Session and Service Continuity, SSC
  • the selecting, by the network device, the first intermediate session management entity for the PDU session according to the location information of the UE and the PDU session requirement includes: the network device selects the PDU session requirement information and the jurisdiction includes the UE.
  • the intermediate session management entity of the serving base station indicated by the location information serves as the first intermediate session management entity.
  • the PDU session requirement includes a PDU session type and/or an SSC.
  • the location information of the UE may be an identifier of the serving base station of the UE or an identifier of the serving cell of the UE or a tracking area identifier of the UE, and the network device may determine, according to the location information of the UE, whether the serving base station indicated by the location information of the UE can be in the first intermediate session.
  • the management entity is connected.
  • Each intermediate session management entity has a certain jurisdiction, and the size of the jurisdiction is not limited in this application. For example, the jurisdiction of the intermediate session management entity is a province, a city, or a data center.
  • the PDU session requirement information includes a PDU session type and/or an SSC, if the network device determines that the service base station that does not exist and satisfies the PDU session requirement and the location information including the location information indication of the UE An intermediate session management entity, the network device respectively selecting a second intermediate session management entity that satisfies the PDU session requirement information, and selecting a third intermediate session management entity, a second intermediate session management entity, and a serving base station whose jurisdiction includes the location information indication of the UE
  • the third intermediate session management entity simultaneously serves the PDU session. In this way, the same PDU session can be served by multiple intermediate session management entities, and each intermediate session management entity is only responsible for managing the network elements in the specified range, which reduces the management load and complexity of the intermediate session management entity.
  • the PDU session requirement information includes a local DNN and a data transmission mode
  • the local DNN represents a name of a local DN (Data Network, Data Network, DN for short).
  • the data transmission mode indicates the transmission mode of the data packet on the user plane, and the data transmission mode is the Mutilhoming mode or the ULCL (Uplink Classifier) mode.
  • the selecting, by the network device, the first intermediate session management entity for the PDU session according to the location information of the UE and the PDU session requirement information includes: the network device selects the location information indication that includes the UE while satisfying the jurisdiction The serving base station and the local DN indicated by the local DNN, and the intermediate session management entity supporting the data transmission mode included in the PDU session requirement information as the first intermediate session management entity.
  • the network device determines that there is no local DN indicated by the local DNN included in the serving base station and the PDU session requirement information included in the jurisdiction information indicating the location information of the UE, and the PDU session requirement information is supported.
  • An intermediate session management entity including a data transmission mode, selecting a second intermediate session management entity of the serving base station whose jurisdiction includes the location information indication of the UE, and selecting a local DN indicating that the jurisdiction includes the local DNN indication included in the PDU session requirement information
  • the network device may be an access management entity or a session management entity, and the second intermediate session management entity and the third intermediate session management entity simultaneously provide services for the PDU session.
  • the data transmission mode is a Mutilhoming mode
  • the network device sends the uplink offload policy and the uplink routing policy to the first intermediate session management entity, where the uplink offload policy is used to control the UE anchoring
  • the branch point BP is offloaded according to the source address of the data packet sent by the UE, and the uplink routing policy is used to control the UE to use the IP address anchored at the anchor user plane entity or the local IP address anchored at the local anchor user plane entity as The source address of the data packet; or the network device sends the uplink routing policy corresponding to the IP address of the anchor user plane entity and the IP address anchored to the anchor user plane entity to the first intermediate session management entity; anchored in The IP address of the anchor user plane entity is used to enable the first intermediate session management entity to generate an uplink offload policy, and the uplink routing policy corresponding to the IP address of the anchor user plane entity is used to enable the first intermediate session management entity to generate an uplink route.
  • the uplink offloading policy is used to control the BP to perform traffic off according to the source address of the data packet sent by the UE, and the uplink routing policy is used to indicate the UE.
  • the data transmission mode is a ULCL mode
  • the network device sends an uplink forwarding policy to the first intermediate session management entity, and the uplink forwarding policy is used to control the UE-anchored ULCL according to the UE.
  • the quintuple and/or application ID of the packet is forwarded.
  • the UE in a handover procedure of the UE, the UE is handed over to the target base station by the current serving base station, and before the handover occurs, the UE has established a PDU session, and the network device saves the PDU session.
  • PDU session requirement information the network device may learn that the UE is handed over to the target base station by the current serving base station according to the path switching message from the target base station, and the network device determines that the target base station is not within the jurisdiction of the current first intermediate session management entity, the network The device selects a target intermediate session management entity, and the target intermediate session management entity is an intermediate session management entity that simultaneously satisfies the target base station and PDU session requirement information that the UE switches to.
  • the network device selects a second intermediate session management entity including the target base station and a third intermediate session management that satisfies the PDU session requirement information when there is no intermediate session management that satisfies the jurisdiction including the target base station and the PDU session requirement information.
  • the entity, the second intermediate session management entity and the third intermediate session management entity are the target intermediate session management entities.
  • the network device is a session management entity
  • the session management entity further includes: session management before selecting the first intermediate session management entity for the PDU session according to the location information of the UE and the PDU session requirement information.
  • the entity determines PDU session requirement information, wherein the session management entity may determine the PDU session requirement information according to the PDU session subscription information; or the session management entity may sign the PDU session according to one or more of the PDU session policy information and the PDU session expectation information.
  • the information determines PDU session demand information.
  • the session management entity selects an anchor user plane entity within the jurisdiction of the session management entity according to the PDU session requirement information.
  • the jurisdiction of the session management entity may be a province, a city, a data center, or other scope.
  • the session management entity determines, according to the location information of the UE, the serving base station indicated by the location information of the UE, and determines that the serving base station indicated by the location information of the UE is not connected to the selected anchor user plane entity, and the session management function is based on the location information and the PDU of the UE.
  • the session requirement information selects the first intermediate session management entity.
  • the PDU session policy information indicates a related policy of the PDU session, for example, QoS (Quality of Service, QoS for short).
  • the PDU session expectation information indicates session related parameters requested by the UE, for example, the PDU session expectation information includes one or more of a local DNN, a PDU session type, and an SSC mode.
  • the network device is a session management entity
  • the session management entity further includes: session management before selecting the first intermediate session management entity for the PDU session according to the location information of the UE and the PDU session requirement information.
  • the entity determines the PDU session requirement information according to the PDU session subscription information; or the session management entity determines the PDU session requirement information according to one or more of the PDU session expectation information and the PDU session policy information, and the PDU session subscription information.
  • the PDU session policy information can come from the policy control entity of the core network.
  • the PDU session expectation information indicates related parameters of the PDU session requested by the UE, and the PDU session expectation information includes one or more of a PDU session type, an SSC mode, and a local DNN.
  • the session management entity determines that the local DN indicated by the local DNN included in the PDU session requirement information is not within the jurisdiction of the session management entity.
  • the network device is an access management entity, and before the network device selects the first intermediate session management entity for the PDU session according to the location information of the UE and the PDU session requirement information, the network device further includes: The management entity selects a session management entity, wherein the access management entity can select a session management entity based on local DNNs from the UE, network slice information, and UE subscription information.
  • the access management entity determines that the serving base station indicated by the location information of the UE is not located within the jurisdiction of the session management entity, and the access management entity according to one or more of the local DNN, the network slice information, and the UE subscription information from the UE and the UE
  • the location information selects a fourth intermediate session management entity, the access management entity receives PDU session requirement information and a reselection indication message from the session management entity, and the reselection indication message is used to instruct the access management entity to reselect a different and fourth intermediate The first intermediate session management entity of the session management entity.
  • the network device is an access management entity, and before the network device selects the first intermediate session management entity for the PDU session according to the location information of the UE and the PDU session requirement information, the network device further includes: The management entity selects a session management entity, wherein the access management entity may select the session management entity according to one or more of local DNN and network slice information carried in the PDU session establishment request from the UE.
  • the access management entity determines that the serving base station indicated by the location information of the UE is not located within the jurisdiction of the session management entity, and the access management entity selects the fourth intermediate session management entity, receives the PDU session requirement information from the session management entity, and determines the fourth intermediate The session management entity does not satisfy the PDU session requirement information.
  • the network device is an access management entity
  • the PDU session request information network device selects the first intermediate session management entity for the PDU session according to the location information of the UE and the PDU session requirement information.
  • the method includes: when the demand of the PDU session changes, the access management entity receives new PDU session requirement information and a reselection indication message from the session management entity, where the reselection indication message is used to instruct the access management entity to reselect an intermediate session management entity.
  • the network device is an access management entity
  • the first intermediate session management entity currently provides a service for the PDU session.
  • the access management entity receives the session from the session.
  • the new PDU session requirement information of the management entity the access management entity determines that the first intermediate session management entity does not satisfy the new PDU session requirement information, and selects the target intermediate session management entity according to the location information of the UE and the new PDU session requirement information.
  • the network device is the session management entity session management entity according to the PDU session subscription information; or according to one or more of the PDU session policy information and the PDU session expectation information, and the PDU session.
  • the subscription information determines the PDU session requirement information
  • the session management entity determines that the fourth intermediate session management entity selected by the access management entity does not satisfy the PDU session requirement information, and the session management entity selects the first PDU session according to the location information of the UE and the PDU session requirement information.
  • An intermediate session management entity the session management entity sends the identifier information of the first intermediate session management entity to the access management entity, where the identifier information is used to uniquely represent the identity of the first intermediate session entity, for example, the identifier information of the first intermediate session management entity It can be address information, location information or ID (Identity, ID for short).
  • the application provides a communication system, where the communication system includes a network device and a first intermediate session management entity, where the network device can be an access management entity or a session management entity, and the network device is configured to use location information and PDUs of the UE.
  • the session requirement information selects a first intermediate session management entity for the PDU session.
  • the first intermediate session management entity is configured to receive PDU session requirement information from the network device, and select a user plane entity according to the location information of the UE and the PDU session requirement information. It should be noted that the session management entity and the first intermediate session management entity have a certain jurisdiction, and the jurisdictions of the session management entity and the first intermediate session management entity do not overlap, and the first intermediate session management entity is responsible for managing the network in the jurisdiction.
  • the user plane entity, the size of the jurisdiction of the first intermediate session management entity may be determined by the operator according to requirements, for example, the jurisdiction of the first intermediate session management entity is a province, a city, or a data center, There are no restrictions on the application.
  • the network device selects the intermediate session management entity according to the location information of the UE and the PDU session requirement information, so that the intermediate session management entity close to the UE can serve the PDU session, reducing the delay of data transmission.
  • the intermediate session management entity selects the user plane entity according to the location information of the UE and the PDU requirement information, and the intermediate session management entity only manages the user plane entity in the specified range, and does not need to manage the user plane entity of the entire PDU session, thereby reducing management complexity.
  • the first intermediate session management entity is further configured to receive an uplink offloading policy and an uplink routing policy from the network device, configure the uplink offloading policy to the BP, and configure the uplink routing policy.
  • the uplink offloading policy is used to control the BP to perform traffic off according to the source address of the data packet sent by the UE, and the uplink routing policy is used to control the UE to use the IP address anchored at the anchor user plane entity or anchored locally.
  • the local IP address of the anchor user plane entity as the source address of the data packet; or
  • the first intermediate session management entity is further configured to send an uplink routing policy corresponding to the IP address of the anchor user plane entity and the IP address anchored to the anchor user plane entity to the first intermediate session management entity;
  • the IP address of the anchor user plane entity is used to enable the first intermediate session management entity to generate an uplink offload policy
  • the uplink routing policy corresponding to the IP address of the anchor user plane entity is used to enable the first intermediate session management entity to generate an uplink. Routing policy;
  • the uplink offloading policy is used to control the BP to perform traffic off according to the source address of the data packet sent by the UE, and the uplink routing policy is used to indicate that the UE uses the IP address anchored at the anchor user plane entity or uses the anchor to the local anchor point user.
  • the local IP address of the polygon entity is used as the source address to send data.
  • the data transmission mode is a ULCL mode
  • the first intermediate session management entity is configured to select, according to location information of the UE and PDU session requirement information, within the jurisdiction of the first intermediate session management entity.
  • the user plane entity is specifically: selecting a local anchor user plane entity for the PDU session, and selecting a ULCL for the PDU session.
  • the session management entity also selects an anchor user plane entity for the PDU session, and the anchor user plane entity is used to connect to the DN.
  • the ULCL corresponds to two transmission links: a transmission link between the ULCL to the anchor user plane entity, and a transmission link between the ULCL and the user plane entity, the ULCL based on the quintuple and/or application of the data packet from the UE
  • the identifier is divided.
  • the quintuple indicates the source IP address, the destination IP address, the source port number, the destination port number, and the protocol version.
  • the application identifier indicates the identification information of the application that generates the data packet on the UE.
  • the ULCL performs offloading according to a preset uplink forwarding policy, where the uplink forwarding policy indicates a correspondence between the transport link identifier and the quintuple and/or the identifier.
  • the first intermediate session management entity is further configured to receive an uplink forwarding policy sent by the network device from the network device, and configure the uplink forwarding policy to the ULCL.
  • the PDU session requirement information further includes a PDU session type, and the PDU session type is an IP type, where the first intermediate session management entity is further configured to send a local anchor user plane entity to the session management entity.
  • the first intermediate session management entity is further configured to send a local anchor user plane entity to the session management entity.
  • One or more of the location information and the location information of the local DN, and the local IP address of the UE, the local IP address of the UE indicating the IP address of the anchor assigned by the first intermediate session management entity on the local anchor user plane entity address.
  • the present application provides an apparatus having a function of implementing the behavior of a network device in the above method.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more units corresponding to the functions described above.
  • the apparatus includes: a selecting unit and a transceiver unit.
  • a selecting unit configured to select a first intermediate session management entity for the PDU session according to the location information of the user equipment UE and the protocol data unit PDU session requirement information.
  • a transceiver unit configured to send the location information of the UE and the PDU session requirement information to the first intermediate session management entity, where the location information of the UE and the PDU session requirement information are used to select a user plane entity .
  • the network device includes: a transceiver, a memory, and a processor; wherein the memory stores a set of program codes, and the processor is configured to invoke program code stored in the memory
  • the session management method of any one of the possible implementations of the first aspect to the first aspect is performed.
  • the principle and the beneficial effects of the device can be referred to the method embodiments of the foregoing possible terminal devices and the beneficial effects thereof. Therefore, the implementation of the device can refer to the implementation of the method, and the repetition is not Let me repeat.
  • the application provides a session management method, including:
  • the network device selects a first intermediate session management entity for the protocol data unit PDU session according to the local network data name DNN;
  • the network device sends the location information of the user equipment UE to the first intermediate session management entity, where the location information of the UE is used to select a user plane entity.
  • the selecting, by the network device, the first intermediate session management entity for the PDU session according to the local DNN includes:
  • the network device selects a first intermediate session management entity according to location information of the local DNN and the UE; wherein, selecting a local data network DN that supports the local DNN indication, and a location information indication that the jurisdiction includes the UE The first intermediate session management entity of the serving base station.
  • the selecting, by the network device, the first intermediate session management entity for the PDU session according to the local DNN includes:
  • the network device selects an intermediate session management entity supporting the local data network DN indicated by the local DNN as the first intermediate session management entity.
  • the network device is a session management entity, and the method further includes:
  • the network device determines the local DNN based on information from the application function.
  • the method further includes:
  • the network device sends the location information of the UE to the first intermediate session management entity, where the location information of the UE is used to indicate that the first intermediate session management entity selects a user plane entity that supports the UE location, An access network interface that supports the user plane entity of the UE location and the UE.
  • the method further includes:
  • the network device sends the local DNN to the first intermediate session management entity; wherein the local DNN is used to instruct the first intermediate session management entity to select a local anchor user plane entity.
  • the user plane entity selected by the first intermediate session management entity supports both the local DNN and the UE location information
  • the first intermediate session management entity selects a user plane entity supporting the local DNN as a local anchor user plane entity according to the local DNN, and according to the The UE location information selects a user plane entity supporting the UE location information for an access network interface connected to the UE, wherein the local anchor user plane entity is configured to interface with the local DN.
  • the network device sends a data transmission mode to the first intermediate session management entity; wherein the data transmission mode is used to instruct the first intermediate session management entity to determine an uplink traffic distribution rule.
  • the network device further sends the remote UE IP address to the first intermediate session management entity; wherein the remote UE IP is used Instructing the first intermediate session management entity to determine an uplink offload rule.
  • the network device further sends application information to the first intermediate session management entity, where the application information is used to indicate The first intermediate session management entity determines an uplink offload rule; the application information is at least one of an application identifier or a five-tuple corresponding to the application.
  • the network device sends an uplink offload rule or an uplink forwarding rule to the first intermediate session management entity, where the uplink offload rule or the uplink forwarding rule is used to indicate the first intermediate session management.
  • the entity configures the user plane entity to implement uplink data offloading.
  • the network device sends routing information between the local anchor point and the local data network DN identified by the local DNN to the first intermediate session management entity, and the routing information is used to determine the user plane.
  • the forwarding path between the entity and the local data network DN is used to determine the user plane.
  • a still further aspect of the present application provides an apparatus, including: a memory and a processor; wherein the memory stores a set of program codes, and the processor is configured to invoke program code stored in the memory, and execute Four possible aspects and various possible implementations of the fourth aspect.
  • the present application provides an apparatus having a function of implementing network device behavior in each of the possible implementation methods of the fourth aspect described above.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more units corresponding to the functions described above.
  • the apparatus includes: a selecting unit and a transceiver unit.
  • Yet another aspect of the present application is directed to a computer readable storage medium having instructions stored therein that, when executed on a computer, cause the computer to perform the methods described in the various aspects above.
  • Yet another aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the methods described in the various aspects above.
  • FIG. 1a is a network architecture diagram provided by an embodiment of the present invention.
  • Figure 1b is a diagram of a next generation network architecture based on Figure 1a;
  • 2a is another network architecture diagram provided by an embodiment of the present invention.
  • Figure 2b is a diagram of the next generation network architecture based on Figure 2a;
  • FIG. 3 is a schematic flowchart of a session management method according to an embodiment of the present invention.
  • FIG. 4 is a schematic flowchart of another session management method according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart diagram of another session management method according to an embodiment of the present invention.
  • FIG. 6 is a schematic flowchart diagram of another session management method according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a device according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a network device according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic flowchart diagram of another session management method according to an embodiment of the present invention.
  • FIG. 10 is a schematic flowchart diagram of another session management method according to an embodiment of the present invention.
  • FIG. 1a is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • the communication system may be a Global System for Mobile Communication (GSM), a Code Division Multiple Access (CDMA) system, or a Wideband Code Division Multiple Access (WCDMA) system.
  • GSM Global System for Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • WiMAX Worldwide Interoperability for Microwave Access
  • LTE long term evolution
  • 5G communication system such as new radio (NR) system
  • NR new radio
  • the communication system shown in FIG. 1a includes: an access network, an access management entity, a session management entity, and a first intermediate session management entity, and may also include a policy.
  • the form and number of the various network elements in FIG. 1a are for illustrative purposes only and do not constitute a limitation on the embodiments of the present invention.
  • the access management entity separately communicates with the policy control entity, the access network, and the policy control entity, and the session management entity communicates with the policy control entity, the first intermediate session management entity, and the anchor user plane entity respectively, and the access network respectively.
  • the access management entity and the user plane entity communicate with each other, and the first intermediate session management entity communicates with the session management entity and the user plane entity respectively, and the anchor user plane entity and the data network communicate with each other.
  • the access management entity communicates with the session management entity.
  • the access management entity is mainly responsible for access and mobility management, including functions such as authentication, handover, and location update for the user;
  • the session management entity is mainly responsible for session management, including functions of establishing, modifying, and releasing PDU sessions; It is mainly responsible for the management of user measurement, including the generation of mobility-related policies and PDU session-related policies.
  • PDU session-related policies include QoS (Quality of Service, QoS for short) policies, charging policies, etc.
  • the user plane entity is divided into a common user plane entity and an anchor user plane entity, the anchor user plane function is a user plane function connected with the data network; the data network is a destination of the user's PDU session access;
  • An intermediate session management entity is mainly responsible for the management of user plane entities in the jurisdiction, including load sharing of user plane entities, selection of user plane entities, establishment of tunnels on user plane entities, and formulation and configuration of forwarding rules of user plane entities.
  • the session management entity includes the establishment of a user plane tunnel, the configuration of a forwarding rule of the user plane entity, and the like. It should be noted that the first intermediate session management entity may be deployed separately or integrated in the session management entity, which is not limited in this application.
  • the jurisdiction of the first intermediate session management entity may be determined by the operator as needed during deployment.
  • the jurisdiction of the first intermediate session management entity is a province or a city or a tracking area or a data center, which is not implemented in the embodiment of the present invention. limit.
  • FIG. 1b is an architectural diagram of a 5G communication system.
  • the AMF Access Management Function, AMF for short
  • the RAN corresponds to the access network in FIG. 1a
  • the SMF corresponds to FIG. 1a.
  • the session management entity, the Intermediate Session Management Function (ISMF) corresponds to the first intermediate session management entity in Figure 1a
  • the UPF corresponds to the user plane entity in Figure 1a
  • A-UPF Anchor User Plane Function
  • the anchor user plane function referred to as A-UPF, corresponds to the anchor user plane entity in Figure 1a, DN (Data Network, Data Network, DN for short).
  • the RAN and the AMF communicate with each other through the N2 interface.
  • the RAN and the UPF communicate with each other through the N3 interface.
  • the two UPFs communicate with each other through the N9 interface.
  • the UPF and A-UPF in Figure 1b communicate with each other through the N9 interface.
  • the IS4 and the UPF can communicate with each other through the N4 interface, and the SMF and the A-UPF can also communicate with each other through the N4 interface.
  • the A-UPF communicates with the DN through the N6 interface.
  • the SMF and the PCF communicate with each other through the N7 interface.
  • the SMF and the ISMF can communicate with each other through the N16 interface.
  • the SMF and the AMF communicate with each other through the N11 interface.
  • the AMF and the PCF communicate with each other through the N15 interface.
  • FIG. 2a is another structural diagram of a communication system according to an embodiment of the present invention.
  • the structure of the communication system shown in FIG. 2a and the structure of the communication system of FIG. 1a are only different in that: an access management entity and a session management entity. There is no interworking between the access management entity and the intermediate session management entity.
  • the function of each network element in FIG. 2a can be referred to the description in FIG. 1a, and details are not described herein again.
  • Figure 2b is another architecture diagram of the 5G communication system.
  • the correspondence between the network element in Figure 2b and the network element in Figure 2a can be referred to the corresponding relationship of the network elements in Figure 1b and Figure 1a. Narration.
  • the structure of the communication system of FIG. 2b is different from the structure of the communication system of FIG. 1b only in that the AMF and the SMF are not interworking, and the AMF and the ISMF are interworked through the N11 interface.
  • the access network in the present application may also be referred to as a base station device, and is a device deployed in the radio access network to provide wireless communication functions, including but not limited to: a base station (for example, BTS (Base Transceiver Station, BTS) ), Node B (NB), Evolved Node B (eNB or eNodeB), transmission node or transmission reception point (TRP or TP) or next generation Node B (generation node B) in the NR system , gNB), base station or network equipment in future communication networks), relay stations, access points, in-vehicle devices, wearable devices, wireless-fidelity (Wi-Fi) sites, wireless backhaul nodes, small stations , micro stations and so on.
  • BTS Base Transceiver Station
  • NB Node B
  • eNB or eNodeB Evolved Node B
  • TRP or TP transmission reception point
  • generation node B generation node B
  • gNB next generation node B
  • relay stations access points
  • one PDU session may correspond to multiple user plane entities, different user plane entities may be located at different locations, and the session management entity needs to simultaneously manage user plane entities at different locations, which causes a management process. More complicated.
  • an embodiment of the present invention provides a communication system, including: a network device and a first intermediate session management entity.
  • the network device is configured to select a first intermediate session management entity for the PDU session according to the location information of the user equipment UE and the protocol data unit PDU session requirement information.
  • the network device in this embodiment is an access management entity or a session management entity.
  • the first intermediate session management entity is configured to receive PDU session requirement information from the network device, and select a user plane entity according to the location information of the UE and the PDU session requirement information.
  • the PDU session requirement information includes a data transmission mode and a local data network name DNN.
  • the communication system further includes an anchor user plane entity, a local anchor user plane entity (not shown), a serving base station, and a BP (not shown).
  • the serving base station is an access network device, and the data transmission mode is a multi-homing Mutilhoming mode;
  • the first intermediate session management entity is configured to select a user plane entity according to the location information of the UE and the PDU session requirement information in the jurisdiction of the first intermediate session management entity, specifically: selecting a local anchor user plane entity for the PDU session, and The PDU session selects a branch point BP; wherein, the BP is used to offload the data packet sent by the UE, and the local anchor user plane entity is connected with the local data network DN indicated by the local DNN included in the PDU session requirement information, and the location information of the BP and the UE Indicated service base station connection.
  • the first intermediate session management entity is further configured to receive an uplink offload policy and an uplink routing policy from the network device, configure an uplink offload policy to the BP, and configure an uplink routing policy.
  • the uplink offloading policy is used to control the BP to perform traffic off according to the source address of the data packet sent by the UE, and the uplink routing policy is used to control the UE to use the IP address anchored at the anchor user plane entity or anchored locally.
  • the local IP address of the anchor user plane entity as the source address of the data packet; or
  • the first intermediate session management entity is further configured to send an uplink routing policy corresponding to the IP address of the anchor user plane entity and the IP address anchored to the anchor user plane entity to the first intermediate session management entity;
  • the IP address anchored at the anchor user plane entity is used to enable the first intermediate session management entity to generate an uplink offload policy, and the uplink routing policy corresponding to the IP address of the anchor user plane entity is used to make the
  • the first intermediate session management entity generates the uplink routing policy, where the uplink offloading policy is used to control the BP to perform traffic off according to a source address of a data packet sent by the UE, where the uplink routing policy is used to indicate the UE
  • the data is transmitted using the anchored IP address at the anchor user plane entity or using the local IP address anchored at the local anchor user plane entity as the source address.
  • the communication system further includes a ULCL and a local DN (not shown), the data transmission mode is a ULCL mode, and the first intermediate session management entity is used in the first intermediate session.
  • the user plane entity is selected according to the location information of the UE and the PDU session requirement information in the jurisdiction of the management entity, specifically: selecting a local anchor user plane entity for the PDU session, and selecting an uplink classifier ULCL for the PDU session; wherein, ULCL
  • the application identifier and/or a 5-tuple of the data packet sent by the UE are offloaded, and the local anchor user plane entity is connected to the local DN indicated by the local DNN, and the ULCL is connected to the serving base station indicated by the location information of the UE.
  • the first intermediate session management entity is further configured to receive an uplink forwarding policy from the network device, and configure an uplink forwarding policy to the ULCL; wherein the uplink forwarding policy is used to control the ULCL.
  • the split is performed according to one or more of the quintuple and the application identifier.
  • the PDU session requirement information further includes a PDU session type, and the PDU session type is an IP type.
  • the first intermediate session management entity is further configured to send, to the session management entity, one or more of location information of the local anchor user plane entity and location information of the local DN, and a local IP address of the UE.
  • the PDU session requirement information includes one or more of a session and a service continuity SSC mode and a PDU session type.
  • the network device is configured to select, according to the location information of the UE and the protocol data unit PDU session requirement information, the first intermediate session management entity for the PDU session, specifically: selecting and satisfying the PDU session requirement at the same time.
  • the information and the jurisdiction include the intermediate session management entity of the serving base station indicated by the location information of the UE as the first intermediate session management entity.
  • the network device can be an access management entity or a session management entity.
  • the network device is further configured to: if it is determined that there is no intermediate session management entity that satisfies the PDU session requirement and the jurisdiction includes the location information indication of the UE; and selects to satisfy the PDU session.
  • the network device in this embodiment may be an access management entity or a session management entity.
  • the network device is configured to select a first intermediate session management entity for the PDU session according to the location information of the UE and the protocol data unit PDU session requirement information, where the selection jurisdiction includes the UE.
  • the serving base station indicated by the location information and the local DN indicated by the local DNN including the PDU session requirement information, and the intermediate session management entity supporting the data transmission mode are used as the first intermediate session management entity.
  • the network device in this embodiment may be an access management entity or a session management entity.
  • the network device is further configured to: if it is determined that there is no local DN indicated by the serving base station and the local DNN indicated by the location information of the UE, and an intermediate session management entity that supports the data transmission mode; the location of the selection includes the location of the UE.
  • the information indicates the second intermediate session management entity of the serving base station, and the third intermediate session management entity that selects the local DN whose jurisdiction includes the local DNN indication and supports the data transmission mode.
  • the network device in this embodiment may be an access management entity or a session management entity.
  • the communication system further includes an access management entity and a policy management entity, where the network device is a session management entity, and the access management entity is configured to select a session management entity.
  • the network device is further configured to determine PDU session requirement information according to the PDU session subscription information; or determine PDU session requirement information according to one or more of the PDU session policy information and the PDU session expectation information, and the PDU session subscription information; according to the PDU session requirement
  • the information selects an anchor user plane entity for the PDU session; and determines that the anchor user plane entity and the serving base station indicated by the location information of the UE are not connected.
  • the network device acquires PDU session requirement information from the policy management entity.
  • the communication system includes an access management entity, and the network device is a session management entity.
  • the access management entity is used to select a session management entity.
  • the session management entity is further configured to: determine PDU session requirement information according to the PDU session subscription information; or determine PDU session requirement information according to one or more of PDU session policy information and PDU session expectation information, and PDU session subscription information;
  • the jurisdiction of the managed entity does not include the local DN indicated by the local DNN.
  • the communication system further includes an access management entity, where the network device is a session management entity;
  • the access management entity is configured to select a session management entity, and select a fourth intermediate session management entity (not shown in FIG. 2a) when the jurisdiction of the session management entity does not include the serving base station indicated by the location information of the UE.
  • the session management entity is further configured to: determine the PDU session requirement information according to the PDU session subscription information, or one or more of the PDU session policy information and the PDU session expectation information, and determine that the fourth intermediate session management entity is not satisfied.
  • the PDU session requirement information is used by the session management entity to send the identifier information of the first intermediate session management entity to the access management entity.
  • the communication system further includes a session management entity, and the network device is an access management entity.
  • the session management entity is configured to determine PDU session requirement information according to the PDU session subscription information; or determine PDU session requirement information according to one or more of PDU session policy information and PDU session expectation information, and PDU session subscription information; determine access management
  • the fourth intermediate session management entity selected by the entity does not satisfy the PDU session requirement information, and sends a PDU session requirement information and a reselection indication message to the access management entity, where the reselection indication message is used to instruct the access management entity to select the first intermediate session management entity.
  • the access management entity is further configured to select a session management entity, select a fourth intermediate session management entity when the jurisdiction of the session management entity does not include the serving base station indicated by the location information of the UE, and receive the PDU session requirement information from the session management entity. And reselect the indication message.
  • the communication system further includes a session management entity, and the network device is an access management entity.
  • the session management entity is configured to: according to the PDU session subscription information; or determine the PDU session requirement information according to one or more of the PDU session policy information and the PDU session expectation information, and the PDU session subscription information, and send the PDU session request to the access management entity. information.
  • the access management entity is further configured to select a session management entity, and when the jurisdiction of the session management entity does not include the serving base station indicated by the location information of the UE, select a fourth intermediate session management entity (not shown in FIG. 2a), and determine the fourth The intermediate session management entity does not satisfy the PDU session requirement information from the session management entity.
  • the embodiment of the present invention implements the intermediate session management entity according to the location information of the UE and the PDU session requirement information, so that the intermediate session management entity close to the UE can provide services for the PDU session, thereby reducing the delay of data transmission.
  • the intermediate session management entity selects the user plane entity according to the location information of the UE and the PDU requirement information, and the intermediate session management entity only manages the user plane entity in the specified range, and does not need to manage the user plane entity of the entire PDU session, thereby reducing management complexity.
  • FIG. 3 is a schematic flowchart of a session management method according to an embodiment of the present invention.
  • the session management method is based on the network architecture of FIG. 1a, and the network device is an access management entity.
  • the method includes but is not limited to the following steps:
  • the user equipment sends a PDU session establishment request to the access management entity, where the access management entity receives the PDU session establishment request sent by the user equipment.
  • the user equipment sends a PDU session establishment request to the access management entity by using the serving base station (not shown), where the PDU session establishment request is used to create a PDU session, and the PDU session establishment request carries the PDU session expectation information and The location information of the UE, the PDU session expectation information is a related parameter requirement of the PDU session requested by the user equipment, and the PDU session expectation information includes one or more of local DNN, network slice information, PDU session type, and SSC mode, and network slice information.
  • a related attribute for describing a network slice for example, the network slice information includes one or more of a network slice type, a network slice identifier, and a network slice location.
  • the PDU session expectation information is a NAS (Non-Access Stratum) message.
  • the location information of the UE indicates the location in the access network of the UE, and the location information of the UE may be the identifier of the serving cell of the UE or the identifier of the serving base station of the UE or the tracking area identifier of the UE.
  • the access management entity selects a session management entity.
  • the access management entity obtains the resolvable parameter carried in the PDU session establishment request, where the parameters that the access management entity can parse include the location information of the UE, the local DNN, and the network slice information, and the access management entity according to the location of the UE
  • the session management entity is selected by one or more of information, local DNN, and network slice information.
  • the access management entity may use one or more of the location information of the UE, the local DNN, and the network slice information as input parameters, in a database configured locally according to the input parameter, or in a Network Function Repository Function (NRF).
  • NRF Network Function Repository Function
  • the function referred to as NRF, performs a query to obtain the identity of the selected session management entity.
  • the access management entity sends a PDU session establishment request to the session management entity.
  • the session management entity receives the PDU session request message sent by the access management entity, selects an anchor user plane entity, and determines that the first intermediate session management entity needs to be selected.
  • the session management entity selects the first intermediate session management entity according to the location information of the UE and the PDU session requirement information.
  • the session management entity parses the location information of the UE and the PDU session expectation information in the PDU session management request, and the session management entity obtains the PDU session subscription information from the UDM (Unified Data Management, UDM for short), the policy.
  • the control entity obtains PDU session policy information, for example, the PDU session policy information includes a QoS (Quality of Service) policy and a charging policy.
  • the session management entity may determine the PDU session requirement information according to the PDU session subscription information; or the session management entity determines the PDU session requirement information according to one or more of the PDU session expectation information and the PDU session policy information, and the PDU session subscription information.
  • the PDU session requirement information indicates the relevant parameter requirements of the PDU session that the network side can accept.
  • the PDU session requirement information includes a PDU session type, an SSC mode, a local DNN, and a data transmission mode, and the transmission mode mode is a Mutilhoming mode or a ULCL mode.
  • the session management entity is pre-configured with a jurisdiction, and the session management entity can only manage network elements within the relationship (for example, base stations, user plane entities, etc.), and the jurisdiction can be determined by the operator at the time of deployment, and the size of the jurisdiction is not limited. For example, the jurisdiction of a session management entity is a province, a city, or a data center.
  • the session management entity selects an anchor user plane entity, and the anchor user plane entity is used to interface with the data network.
  • the session management entity determines whether it is necessary to select the first intermediate session management entity, and the method for determining may be:
  • the session management entity determines whether the serving base station indicated by the location information of the UE is connected to the selected anchor user plane entity. If not, the session management entity selects the first intermediate session management entity according to the location information of the UE and the PDU session requirement information.
  • the session management entity determines whether its own jurisdiction includes the data network indicated by the local DNN. If not, the session management entity selects according to the location information of the UE and the PDU session requirement information. The first intermediate session management entity.
  • the method for the session management entity to select the first intermediate session management entity may be:
  • the session management entity will use the intermediate session management entity of the serving base station that satisfies the PDU session requirement information and whose location includes the location information indication of the UE as the first intermediate session management entity.
  • the session management entity determines that there is no intermediate session management entity that satisfies the PDU session requirement information and the jurisdiction includes the location information indication of the UE, the second intermediate session management entity that meets the PDU session requirement information is selected, and the session is selected.
  • the jurisdiction includes a third intermediate session management entity of the serving base station indicated by the location information of the UE, and the second intermediate session management entity and the third intermediate session management entity simultaneously provide services for the PDU session.
  • the session management entity When the transmission mode and the local DNN are included in the PDU session requirement information, the session management entity will support the DN indicated by the local DNN, and the intermediate session management entity supporting the transmission mode as the first intermediate session management entity.
  • the session management entity determines that there is no DN indicated by the serving base station and the local DNN indicated by the location information of the UE, and an intermediate session management entity that supports the transmission mode, where the session management entity selects the location information indication including the UE.
  • the PDU session provides services.
  • the session management entity sends a PDU session establishment request to the first intermediate session management entity.
  • the PDU session establishment request carries the location information of the UE and the PDU session requirement information.
  • the session management entity may send the location information of the UE and the PDU session requirement information to the first intermediate session management entity through the PDU session establishment request.
  • the session management entity sends an uplink offload policy and an uplink routing policy to the first intermediate session management entity, where the uplink offload policy is used to control the branch point BP anchored by the UE.
  • the uplink routing policy is used to control the UE to use the IP address anchored at the anchor user plane entity or the local IP address anchored at the local anchor user plane entity as the source of the data packet. address.
  • the data transmission mode is a Mutilhoming mode
  • the session management entity sends an IP routing address anchored to the anchor user plane entity and an uplink routing policy corresponding to the IP address anchored to the anchor user plane entity to the An intermediate session management entity
  • the IP address anchored at the anchor user plane entity is used to enable the first intermediate session management entity to generate an uplink offload policy
  • the uplink routing policy is used to enable the first intermediate session management Entity generating the uplink routing policy
  • the uplink routing policy is used to indicate that the UE uses the IP address anchored at an anchor user plane entity or uses a local IP address anchored at a local anchor user plane entity as a source Address to send data.
  • the data transmission mode is an uplink classifier ULCL mode
  • the session management entity sends an uplink forwarding policy to the first intermediate session management entity
  • an uplink forwarding policy is used to control the UE anchoring.
  • the uplink classifier ULCL forwards according to one or more of a quintuple and an application identifier of the data packet sent by the UE.
  • the first intermediate session management entity receives a PDU session establishment request from the session management entity, and the first intermediate session management entity selects a BP and a local anchor user plane entity.
  • S306 is an optional step.
  • the transmission mode is the Mutilhoming mode, where the first intermediate session management entity parses the location information of the UE and the PDU session requirement information in the PDU session establishment request.
  • the first intermediate session management entity selects a local anchor user plane entity for the PDU session, and selects a branch point BP for the PDU session; wherein the BP is used to offload the data packet sent by the UE, the local anchor user plane entity and the PDU
  • the session requirement information includes a local data network DN connection indicated by the local DNN, and the BP is connected to the serving base station indicated by the location information of the UE.
  • the first intermediate session management entity selects a local anchor user plane entity for the PDU session, and selects an uplink classifier ULCL for the PDU session; where the ULCL is used to send data to the UE
  • the application identifier and/or quintuple of the packet is offloaded, and the local anchor user plane entity is connected to the local DN indicated by the local DNN, and the ULCL is connected to the serving base station indicated by the location information of the UE.
  • the jurisdiction of the first intermediate session management entity includes the serving base station of the UE
  • the local anchor user plane entity, the user plane entity connected to the serving base station, and the BP/ULCL may be the same user plane entity.
  • the first intermediate session management entity sends an N4 message to the selected BP.
  • S307 is an optional step.
  • the N4 message in this step represents a message transmitted through the N4 interface
  • the first intermediate session management entity allocates N3 uplink tunnel information and N9 downlink tunnel information
  • the N3 uplink tunnel information indicates a tunnel between the BP and the serving base station of the user equipment.
  • the identification information, the N9 downlink tunnel information indicates the identification information of the tunnel between the BP and the local anchor user plane entity, and the identification information of the tunnel between the BP and the anchor user plane entity.
  • the first intermediate session management entity sends the N3 uplink tunnel information and the N9 downlink tunnel information to the BP through the N4 message, and the BP receives the N3 uplink tunnel information and the N9 downlink tunnel information from the first intermediate session management entity, and creates an N3 tunnel on the local path. And the N9 tunnel.
  • the first intermediate session management entity sends an N4 message to the ULCL.
  • the N4 message includes N3 uplink tunnel information and N9 downlink tunnel information, and the ULCL receives the N4 message to create an N3 tunnel and an N9 tunnel.
  • the first intermediate session management entity sends an N4 message to the selected local anchor user plane entity.
  • S308 is an optional step.
  • the first intermediate session management entity allocates a local IP address and N9 uplink and downlink tunnel information to the local anchor user plane entity, and the first intermediate session management entity sends the local IP address and the N9 uplink and downlink to the local anchor user plane entity through the N4 message.
  • Tunnel information the anchor user plane entity receives the N4 message and creates an N9 tunnel of the local path.
  • the first intermediate session management entity sends a response message to the session management entity.
  • S309 is an optional step.
  • the response message may carry the N9 downlink tunnel information of the BP.
  • the first intermediate session management entity may further send the location information and/or the local IP address of the local anchor user plane entity to the session management entity.
  • the session management entity sends an N4 message to the anchor user plane entity.
  • S310 is an optional step.
  • the session management entity allocates an IP address and an N9 uplink and downlink tunnel information of the anchor user plane entity to the PDU session, and sends the allocated IP address and the N9 uplink and downlink tunnel information to the anchor user plane entity through the N4 message, and the anchor user plane entity Receive an N4 message and create an N9 tunnel with BP.
  • S311 Allocate a radio resource of the PDU session.
  • S311 is an optional step.
  • the session management entity requests the access network (shown in the figure) to create a user plane tunnel and allocate air interface resources for the PDU session, and configure the QoS policy of the PDU session to the access access network, and the access network sends the N3 downlink tunnel information. Give the session management entity.
  • the session management entity sends a PDU session update request to the first intermediate session management entity.
  • S312 is an optional step.
  • the session management entity sends the N3 downlink tunnel information to the first intermediate session management entity.
  • the session management entity may also send the IP address assigned by the session management entity to the first intermediate session management entity when the session type of the PDU session is an IP type.
  • the first intermediate session management entity sends a PDU session update request to the BP.
  • S313 is an optional step.
  • the PDU session update request includes the N3 downlink tunnel information, the N9 uplink tunnel information of the anchor user plane entity, and the N9 uplink tunnel information of the local anchor user plane entity.
  • the BP receives the PDU session update request and updates the PDU session. If the uplink offloading policy needs to be updated, the PDU session update request further includes an updated uplink offloading policy.
  • the first intermediate session management entity sends a response message to the session management entity.
  • the response message indicates that the update of the PDU session is completed.
  • S314 is an optional step.
  • the session management entity receives a response message from the first intermediate session management entity, and sends a response message to the access management entity.
  • S315 is an optional step.
  • the first intermediate session management entity sends a route advertisement to the user equipment by using a local anchor user plane entity.
  • S316 is an optional step.
  • the transmission mode in this step is the Mutilhoming mode.
  • the route advertisement carries the uplink routing policy and the IP address assigned by the session management entity.
  • the uplink routing policy is used to control the IP address or the first IP address assigned by the session management entity when the UE sends the data packet.
  • the local IP address assigned by the intermediate session management entity is used as the source address.
  • the user plane entity may be any type of user plane entity.
  • the user plane entity determines that there is no downlink N3 tunnel information, and the user plane entity sends a downlink data notification to the first intermediate session management entity, and the first intermediate session management entity forwards the received downlink data notification to the session management entity, and the session management entity triggers the paging. Process.
  • the session management entity After receiving the downlink N3 tunnel information sent by the serving base station of the UE, the session management entity sends a PDU session update request to the first intermediate session management entity, and the first intermediate session management entity receives the PDU session update request, and learns the downlink from the PDU session update request.
  • the first intermediate session management entity notifies the user plane entity of the downlink N3 tunnel information, and the user plane entity receives the downlink N3 tunnel information, and then performs uplink data transmission.
  • the session management entity and the intermediate session management entity are only responsible for managing user plane entities within the jurisdiction, and do not need to manage all user plane entities in the entire PDU session, reducing the number of messages in the middle of the user plane entity. And reduced the workload.
  • FIG. 4 is a schematic flowchart of a session management method according to an embodiment of the present invention.
  • a handover process of the architecture 1a is used.
  • the source access network of the UE is a serving base station.
  • the source intermediate session management entity (the first intermediate session management entity), the source user plane entity, and the anchor user plane entity provide services for the PDU session.
  • the method includes, but is not limited to, the following steps:
  • the target access network sends a path switch request to the session management entity by using an access management entity.
  • S401 is an optional step.
  • the target access network After the UE is switched from the source access network to the target access network, the target access network sends a path switch request to the session management entity by using the access management entity, where the path switch request carries the location information of the UE, and the location information of the UE may be The identity of the base station where the UE is camped or the identity of the cell that resides.
  • the session management entity receives the path switch request, and determines, according to the location information of the UE, that the UE is not within the jurisdiction of the first intermediate session management entity, and the session management entity selects the target intermediate session management entity.
  • the session management entity saves the PDU session requirement information of the PDU session, and the session management entity selects the target intermediate session management entity according to the location information of the UE and the PDU session requirement information.
  • the specific selection process refer to the description of S304 in FIG. 3, where No longer.
  • the session management entity sends a PDU session establishment request to the target intermediate session management entity.
  • the PDU session establishment request carries the location information of the UE and the PDU session requirement information.
  • the target intermediate session management entity receives the PDU session establishment request, and selects the target user plane entity according to the location information of the UE and the PDU session requirement information.
  • S404 is an optional step.
  • the specific process of selecting the target user plane entity according to the location information of the UE and the PDU session requirement information of the target intermediate session management entity may refer to the description of S306 in FIG. 3 , and details are not described herein again.
  • the target intermediate session management entity sends an N4 message to the selected target user plane entity, and the target user plane entity receives the N4 message from the target intermediate session management entity, and the target user plane entity is created between the target user plane entity and the anchor user plane entity.
  • the target intermediate session management entity sends a response message to the session management entity, where the response message carries the identification information of the created N3 tunnel and the identification information of the N9 tunnel, and the session management entity receives the identifier information of the N3 tunnel sent by the intermediate session management entity and N9.
  • the identification information of the tunnel, and the identifier information of the N9 tunnel of the anchor user plane entity is updated.
  • the session management entity sends a handover response message to the access management entity, and the access management entity receives the handover response message from the session management entity, and learns to complete the update process of the tunnel.
  • the session management entity selects the intermediate session management entity and the user plane entity close to the UE to provide services for the UE, reduces delay in data transmission, and simultaneously manages the session management entity and the intermediate session.
  • the entity is only responsible for managing user plane entities within the jurisdiction, does not need to manage all user plane entities in the entire PDU session, reduces the number of messages in the middle of the user plane entity and reduces the workload.
  • FIG. 5 is a schematic flowchart of a session management method according to an embodiment of the present invention.
  • the embodiment of the present invention is applicable to the architecture of FIG. 2a, and the method includes but is not limited to:
  • S501 The user equipment sends a PDU session establishment request to the access management entity.
  • S501 is an optional step.
  • the user equipment sends a PDU session establishment request to the access management entity through the associated serving base station (not shown).
  • the PDU session establishment request is used to create a PDU session, and the PDU session establishment request carries the PDU session expectation information and the UE.
  • the location information, the PDU session expectation information is a related parameter requirement of the PDU session requested by the user equipment, and the PDU session expectation information includes one or more of a local DNN, a network slice information, a PDU session type, and an SSC mode, and the network slice information is used. Describe the relevant attributes of the network slice, for example, the network slice information includes one or more of a network slice type, a network slice identifier, and a network slice location.
  • the PDU session expectation information is a NAS (Non-Access Stratum) message.
  • the location information of the UE indicates the location in the access network of the UE, and the location information of the UE may be the identifier of the serving cell of the UE or the identifier of the serving base station of the UE.
  • the access management entity receives the PDU session establishment request from the UE, selects a session management entity, and determines that the fourth session management entity needs to be selected.
  • S502 is an optional step.
  • the access management entity obtains the resolvable parameters carried in the PDU session establishment request, and the parameters that the access management entity can parse include the location information of the UE, the local DNN, and the network slice information, and the access management entity according to the location information of the UE, One or more of the local DNN and network slice information selects a session management entity.
  • the access management entity may use one or more of the location information of the UE, the local DNN, and the network slice information as input parameters, in a database configured locally according to the input parameter, or in a Network Function Repository Function (NRF).
  • NRF Network Function Repository Function
  • the access management entity determines whether the jurisdiction of the selected session management entity includes the serving base station indicated by the location information of the UE, and if not, the access management entity determines that a fourth intermediate session management entity needs to be initially selected, and the access management entity selects
  • the method of the fourth intermediate session management entity may be: selecting the fourth intermediate session management entity according to one or more of the location information of the UE, the local DNN, and the network slice information.
  • the access management entity sends a PDU session establishment request to the fourth intermediate session management entity.
  • the PDU session establishment request further carries the identifier information of the session management entity.
  • S503 is an optional step.
  • the identification information of the first intermediate session management entity may be address information, location information, or ID (Identity, ID for short).
  • the fourth intermediate session management entity receives a PDU session establishment request from the access management entity, and selects a user plane entity.
  • S504 is an optional step.
  • the fourth intermediate session management entity acquires the PDU session expectation information carried in the PDU session request message, the location information of the UE, and the identifier information of the session management entity, and the fourth intermediate session management entity selects according to the PDU session expectation information and the location information of the UE.
  • User face entity (not shown).
  • the method for selecting a user plane entity may be: the fourth intermediate session management entity selects a user plane entity within the jurisdiction, and the selected user plane entity is connected to the serving base station of the UE.
  • the fourth intermediate session management entity sends an N4 message to the selected user plane entity, and the user plane entity receives the N4 message to create an N3 downlink tunnel and an N9 uplink tunnel.
  • the fourth intermediate session management entity sends a PDU session establishment request to the session management entity.
  • S505 is an optional step.
  • the session management entity receives a PDU session establishment request from the fourth intermediate session management entity, selects an anchor user plane entity, and determines that the first intermediate session management entity needs to be selected.
  • the session management entity obtains PDU session subscription information from the UDM, and acquires PDU session policy information from the policy control entity.
  • the session management entity may determine the PDU session requirement information according to the PDU session subscription information; or the session management entity determines the PDU session requirement information according to one or more of the PDU session expectation information and the PDU session policy information, and the PDU session subscription information.
  • the PDU session requirement information indicates the relevant parameter requirements of the PDU session that the network side can accept.
  • the PDU session requirement information includes a PDU session type, an SSC mode, a local DNN, and a data transmission mode, and the transmission mode mode is a Mutilhoming mode or a ULCL mode.
  • the session management entity is pre-configured with a jurisdiction, and the session management entity can only manage network elements within the relationship (for example, base stations, user plane entities, etc.), and the jurisdiction can be determined by the operator at the time of deployment, and the size of the jurisdiction is not limited.
  • the jurisdiction of a session management entity is a province, a city, or a data center.
  • the session management entity selects an anchor user plane entity, and the anchor user plane entity is used to interface with the data network.
  • the session management entity determines whether the fourth intermediate session management entity satisfies the PDU session requirement information. If not, the session management entity selects the first intermediate session management entity according to the location information of the UE and the PDU session requirement information, and determines whether the first intermediate is selected.
  • the session management entity and the method for selecting the first intermediate session management entity reference may be made to the description of S304 in FIG. 3, and details are not described herein again.
  • the session management entity After selecting the first intermediate session management entity, the session management entity notifies the first intermediate session management entity of the location information of the UE and the PDU session requirement information.
  • the session management entity notifying the first intermediate session management entity that the location information of the UE and the PDU session requirement information may be the process of S507 to S509.
  • the session management entity sends a response message to the fourth intermediate session management entity.
  • the response message carries the PDU session requirement information, the location information of the UE, and the identifier information of the first intermediate session management entity, because the first intermediate session entity is reselected at S506.
  • the identification information of the first intermediate session management entity may be address information, location information, or ID (Identity, ID for short).
  • the fourth intermediate session management entity receives the response message from the session management entity, and sends a response message to the access management entity.
  • the fourth intermediate session management entity deletes the local session, and the response message carries the identifier information of the first intermediate session management entity and the PDU session requirement information.
  • the access management entity receives the response message from the fourth intermediate session management entity, and sends a PDU session establishment request to the first intermediate session management entity.
  • the PDU session establishment request carries the location information of the UE and the PDU session requirement information.
  • the first intermediate session management entity receives a PDU session establishment request from the access management entity, acquires location information of the UE, and PDU session requirement information, and selects a user plane entity according to the location information of the UE and the PDU session requirement information, and selects a user plane entity.
  • a PDU session establishment request from the access management entity
  • acquires location information of the UE, and PDU session requirement information and selects a user plane entity according to the location information of the UE and the PDU session requirement information, and selects a user plane entity.
  • the first intermediate session management entity sends an N4 message to the selected user plane entity, and the user plane entity receives the N4 message, and creates a local session according to the indication of the N4 message.
  • the first intermediate session management entity sends a PDU session establishment request to the session management entity.
  • the session management entity sends an N4 message to the anchor user plane entity, the anchor user plane entity receives the N4 message from the session management entity, and creates a session according to the indication of the N4 message.
  • the first intermediate session management entity sends a PDU session establishment request to the session management entity.
  • the session management entity sends an N4 message to the selected anchor user plane entity, the anchor user plane entity receives the N4 message, creates a local session, and after the anchor user plane entity successfully creates a local session, sends a response message to the session management entity, and the response message is sent. Indicates that the local session was successfully created.
  • the session management entity receives the response message, and sends a response message to the first intermediate session management entity.
  • the first intermediate session management entity receives the response message from the session management entity, and the first intermediate session management entity sends the received response message to the access message.
  • the management entity receives an response message from the first intermediate session management entity.
  • the redirection indication message and the PDU session requirement information are sent to the access management entity, and the access management entity receives the reselection indication message and the PDU from the session management entity.
  • the session requirement information the first intermediate session management entity is selected according to the location information of the UE and the PDU session requirement information.
  • the method of selection refer to the description of S304 in FIG. 3, and details are not described herein again.
  • the access management entity receives the PDU session requirement information from the session management entity, and when the access management entity determines that the first intermediate session management entity needs to be selected, according to the location information of the UE and the PDU session requirement. The information selects the first intermediate session management entity.
  • the session management entity when the session management entity determines that the first intermediate session management entity does not need to be selected, the session management entity sends an N4 message to the selected anchor user plane entity, and the anchor user plane entity receives the N4 message, and creates an N3 tunnel and an N9 tunnel.
  • the session management entity sends a response message to the fourth intermediate session management entity, where the response message carries the PDU session requirement information and the location information of the UE, and the fourth intermediate session management entity receives the response message from the session management entity to obtain the PDU session requirement information.
  • the fourth intermediate session management entity determines whether the user plane entity selected by S504 satisfies the PDU session requirement information. If not, the fourth intermediate session management entity reselects the user plane entity according to the location information of the UE and the PDU session requirement information. The description of S306 of FIG. 3 will not be repeated here.
  • the session management entity and the intermediate session management entity are only responsible for managing user plane entities within the jurisdiction, and do not need to manage all user plane entities in the entire PDU session, reducing the number of messages in the middle of the user plane entity. And reduced the workload.
  • FIG. 6 is a schematic flowchart of a session management method according to an embodiment of the present invention.
  • a handover process of the architecture 2a is used.
  • the source access network of the UE is a serving base station.
  • the source intermediate session management entity (the first intermediate session management entity), the source user plane entity, and the anchor user plane entity provide services for the PDU session.
  • the method includes, but is not limited to, the following steps:
  • the target access network sends a path switch request to the access management entity.
  • the path switching request carries the location information of the UE.
  • the access management entity receives a path switch request from the target access network, determines that the UE is not within the jurisdiction of the first intermediate session management entity, and selects the target intermediate session management entity.
  • the method of selecting the target intermediate session management entity can refer to the description of S402 in FIG.
  • the access management entity sends a session establishment request to the target intermediate session management entity.
  • the target intermediate session management entity receives a session establishment request from the access management entity, and selects a target user plane entity.
  • the method of selecting the target user plane entity can be referred to the description of S404 in FIG. S604 is an optional step.
  • the access management entity receives the new PDU session requirement information sent by the session management entity, and the session management entity sends the new PDU session requirement information to the access management entity by using the first intermediate session management entity, and the access management entity determines Whether the intermediate session management entity satisfies the new PDU session requirement information, and if not, the access management entity selects the target intermediate session management entity, and the method of selecting the target intermediate session management entity may refer to the description in S402 in FIG.
  • the access management entity selects an intermediate session management entity and a user plane entity close to the UE to provide services for the UE, reducing delay in data transmission, and the session management entity and the intermediate session management entity are only responsible for managing the jurisdiction.
  • the user plane entity inside does not need to manage all user plane entities in the entire PDU session, reducing the number of messages in the middle of the user plane entity and reducing the workload.
  • FIG. 9 is a schematic flowchart of a session management method according to an embodiment of the present invention.
  • a session management method is based on the network architecture of FIG. 1a. This embodiment assumes that a UE has established a PDU session. The session is served by the session management entity and the user plane of the PDU session is served by the anchor user plane entity. The method includes but is not limited to the following steps:
  • the session management entity selects the first intermediate session management entity.
  • the PDU session requirement information includes one or more of a PDU session type, an SSC mode, a local DNN, and a data transmission mode
  • the data transmission mode is a Mutilhoming mode or a ULCL mode.
  • the session management entity determines the local DNN in the PDU session requirement information according to the information from the application function and the location information of the UE, and the information from the application function includes the subordinate information of the application, for example, which local DN the application is deployed, and the information is used locally. DNN logo.
  • the session management entity selects a local DN close to the UE location according to the location of the UE and one or more local DNs to which the application belongs, and uses the local DNN identifier corresponding to the selected local DN as the local DNN in the PDU session requirement information. It should be noted that other information in the PDU session requirement information, such as a data transmission mode, a PDU session type, and the like, are still determined by using the method in S304, and details are not described herein again.
  • the session management entity selects the first intermediate session management entity to determine whether the first intermediate session management entity needs to be selected, and the session management entity determines whether the first intermediate session management entity needs to be selected, and the determining method may be:
  • the session management entity determines, according to the PDU session requirement information, that when the UPF connected to the local DN is not controlled by the session management entity, the session management entity selects (or acquires) the first intermediate session management entity according to the PDU session requirement information.
  • the session management entity acquires the first intermediate session management entity according to the location information of the UE and the PDU session requirement information.
  • the method for the session management entity to select the first intermediate session management entity may be:
  • the session management entity uses the intermediate session management entity that satisfies the PDU session requirement information as the first intermediate session management entity.
  • the session management entity selects the first intermediate session management entity according to the UE location information and the PDU session requirement information, and the session management entity selects the intermediate session management entity of the serving base station that meets the PDU session requirement information and includes the location information indication of the UE.
  • An intermediate session management entity selects the first intermediate session management entity according to the UE location information and the PDU session requirement information, and the session management entity selects the intermediate session management entity of the serving base station that meets the PDU session requirement information and includes the location information indication of the UE.
  • the session management entity When the transmission mode and the local DNN are included in the PDU session requirement information, the session management entity will support the DN indicated by the local DNN, and the intermediate session management entity supporting the transmission mode as the first intermediate session management entity.
  • the session management entity uses the intermediate session management entity supporting the DN indicated by the local DNN as the first intermediate session management entity.
  • the session management entity uses the intermediate session management entity supporting the transmission mode as the first intermediate session management entity.
  • the session management entity selects the first intermediate session management entity, for example, the session management entity includes the jurisdiction The serving base station indicated by the location information of the UE, the DN indicating the local DNN indication, and the intermediate session management entity supporting the transmission mode as the first intermediate session management entity.
  • the method for selecting the first intermediate session management entity according to other combinations is similar to the above method, and the present invention will not be described again.
  • the session management entity sends a PDU session establishment request to the first intermediate session management entity, where the first intermediate session management entity receives a PDU session establishment request from the session management entity.
  • the PDU session establishment request carries the location information of the UE.
  • the session management entity may send the location information of the UE to the first intermediate session management entity through a PDU session establishment request.
  • the session management entity selects a user plane entity according to the location information of the UE, such as a BP, a local anchor user plane entity, and the like.
  • the PDU session establishment request further carries a data transmission mode, and the data transmission mode is a Multihoming or ULCL mode.
  • the session management entity sends an uplink offloading policy to the first intermediate session management entity, where the uplink offloading policy is used to control the branch point BP anchored by the UE according to the UE.
  • the source address of the packet is offloaded.
  • the session management entity sends the UE IP address (the remote UE IP address) anchored at the anchor user plane entity to the first intermediate session management entity; anchored at the anchor point.
  • the UE IP address of the user plane entity (the remote UE IP address) is used to enable the first intermediate session management entity to generate an uplink offload policy, and the uplink offload policy is used by the Branching Point UPF to forward the received uplink data packet according to the source address.
  • the session management entity when the data transmission mode is the uplink classifier ULCL mode, the session management entity sends an uplink forwarding policy to the first intermediate session management entity, and the uplink forwarding policy is used to control the UE-anchored uplink classifier ULCL according to the One or more of the quintuple and the application identifier of the data packet sent by the UE are forwarded.
  • the session management entity when the data transmission mode is the uplink classifier ULCL mode, the session management entity sends the application information of the access local DN to the first intermediate session management entity, where the application information is the application identifier, and the application corresponding quintuple At least one of the application information is used to indicate that the first intermediate session management entity determines an uplink forwarding policy according to the application information, and the uplink forwarding policy is used to control the uplink classifier ULCL anchored by the UE according to the five-element of the data packet sent by the UE. Forward one or more of the group and application IDs.
  • the session management entity sends the routing information between the local anchor user plane entity and the local DN identified by the local DNN to the first intermediate session management entity, where the routing information is used to determine the local anchor user plane entity and the local DN.
  • the forwarding path between the first intermediate session management entity determines the forwarding rule on the interface of the local anchor user plane entity facing the local DN according to the routing information.
  • the session management entity further sends one or more of the PDU session type and the local DNN to the first intermediate session management entity, where the first intermediate session management entity selects the local user according to the PDU session type and/or the local DNN. Face entity.
  • the first intermediate session management entity selects a local user plane entity.
  • the first intermediate session management entity parses the location information of the UE in the PDU session establishment request.
  • the first intermediate session management entity selects a local anchor user plane entity for the PDU session, and selects a BP for the PDU session; wherein the BP is used to offload the data packet sent by the UE, the local anchor user plane entity and the local DNN indication
  • the local data network DN is connected, and the BP is connected to the serving base station indicated by the location information of the UE.
  • the first intermediate session management entity selects a local anchor user plane entity for the PDU session, and selects an uplink classifier ULCL for the PDU session; where the ULCL is used to send the UE
  • the application identifier and/or the quintuple of the data packet is offloaded, and the local anchor user plane entity is connected to the local DN indicated by the local DNN, and the ULCL is connected to the serving base station indicated by the location information of the UE.
  • the local anchor user plane entity and the user plane entity BP/ULCL connected to the serving base station may be the same user plane entity.
  • the first intermediate session management entity selects BP or ULCL according to the location information of the UE:
  • the first intermediate session management entity selects a user plane entity connected to the serving base station indicated by the location of the UE as BP or ULCL.
  • the first intermediate session management entity when the first intermediate session management entity receives one or more of a transmission mode, a local DNN, and a PDU session type in the PDU session establishment request from the session management entity, the first intermediate session management entity may also be configured according to the transmission mode.
  • One or more of the local DNN and PDU session types select the local session anchor user plane entity:
  • the first intermediate session management entity selects a local session anchor user plane entity according to the data transmission mode, and the first intermediate session management entity selects a user plane entity that supports the data transmission mode indicated by the session management entity as the local session anchor user. Face entity.
  • the first intermediate session management entity selects a local session anchor user plane entity according to the local DNN, and the first intermediate session management entity selects a user plane entity that supports the local DNN indicated by the session management entity as the local session anchor user plane entity.
  • the first intermediate session management entity selects a local session anchor user plane entity according to the type of the PDU session, and the first intermediate session management entity selects a user plane entity that supports a type of the PDU session indicated by the session management entity as a local session anchor. Point the user face entity.
  • the first intermediate session management entity may further select a local session anchor user plane entity according to a combination of any two or three of a data transmission mode, a local DNN, and a PDU session type, for example, the first intermediate session management entity. Selecting a local session anchor user plane entity according to the transmission mode and the local DNN. At this time, the first intermediate session management entity selects a data transmission mode indicated by the support session management entity and a user plane supporting the local DNN indicated by the session management entity. The entity acts as a local session anchor user polygon entity. The selection method of other combinations can be analogized by analogy, and will not be described again here.
  • the user plane entity selected according to the foregoing selection method supports connection with the serving base station indicated by the location of the UE, the user plane entity may be selected as the BP/ULCL and the local session anchor user plane entity.
  • the first intermediate session management entity sends an N4 message to the selected BP or ULCL, and the BP/ULCL receives the message. This step is the same as S307, and will not be described here.
  • the first intermediate session management entity sends an N4 message to the selected local anchor user plane entity. This step is the same as S308, and will not be described here.
  • the first intermediate session management entity sends a response message to the session management entity, and the session management entity receives a response message from the first intermediate session management entity.
  • the response message may carry the N9 downlink tunnel information of the BP or the ULCL.
  • the first intermediate session management entity may also send the local UE IP address to the session management entity.
  • the session management entity sends an N4 message to the anchor user plane entity, and the anchor user plane entity receives the N4 message from the session management entity. This step is the same as S310.
  • the session management entity sends a PDU session update request to the first intermediate session management entity, and the first intermediate session management entity receives the PDU session update request from the session management entity. This step is the same as S312.
  • the first intermediate session management entity sends a PDU session update request to the BP/UCLC, and the BP/ULCL receives the PDU session update request from the first intermediate session management entity. This step is the same as S313.
  • the first intermediate session management entity sends a response message to the session management entity, and the session management entity receives a response message from the first intermediate session management entity.
  • the response message indicates that the update of the PDU session is completed. This step is the same as S314.
  • the first intermediate session management entity sends a route advertisement to the user equipment by using a local anchor user plane entity.
  • the transmission mode in the step is the Mutilhoming mode, where the route advertisement carries the uplink routing policy and the local UE IP address allocated by the first intermediate session management entity, and the uplink routing policy is used to control the UE to select the session management entity to allocate when sending the data packet.
  • the remote UE IP address or the local UE IP address allocated by the first intermediate session management entity is used as the source address.
  • the session management entity may also send a route advertisement to the user equipment according to the requirement, where the route advertisement is used to instruct the UE to select a remote UE IP address or a remote UE IP address.
  • FIG. 10 is a schematic flowchart of a session management method according to an embodiment of the present invention.
  • a handover process of the architecture 1a is used.
  • the source access network of the UE is a serving base station.
  • the source intermediate session management entity (the first intermediate session management entity), the source user plane entity, and the anchor user plane entity provide services for the PDU session.
  • the method includes, but is not limited to, the following steps:
  • S1001 The target access network sends a path switch request to the session management entity by using the access management entity, where the session management entity receives the path switch request from the target access network.
  • the description of S401 is not repeated here.
  • the session management entity selects a target intermediate session management entity.
  • the session management entity determines, according to the location information of the UE, that the UE can access the application more conveniently through the target local DN (such as a more recent or faster access application), and the session management entity uses the target local DNN corresponding to the target local DN as the PDU session requirement. For the local DNN in the information, the session management entity selects the target intermediate session management entity. For the specific selection process, refer to the description of S901 in FIG. 9 , and details are not described herein again.
  • the session management entity sends a PDU session establishment request to the target intermediate session management entity, where the target intermediate session management entity receives the session management entity.
  • the description of S902 is not repeated here.
  • the target intermediate session management entity selects a target user plane entity.
  • the description of S903 is not repeated here.
  • the target intermediate session management entity sends an N4 message to the selected target user plane entity, and the target user plane entity receives the N4 message from the target intermediate session management entity, and the target user plane entity is created between the target user plane entity and the anchor user plane entity.
  • the target intermediate session management entity sends a response message to the session management entity, where the response message carries the identification information of the created N3 tunnel and the identification information of the N9 tunnel, and the session management entity receives the identifier information of the N3 tunnel sent by the intermediate session management entity and N9.
  • the identification information of the tunnel, and the identifier information of the N9 tunnel of the anchor user plane entity is updated.
  • the session management entity sends a handover response message to the access management entity, and the access management entity receives the handover response message from the session management entity, and learns to complete the update process of the tunnel.
  • the session management entity selects the intermediate session management entity and the user plane entity close to the UE to provide services for the UE, reduces delay in data transmission, and simultaneously manages the session management entity and the intermediate session.
  • the entity is only responsible for managing user plane entities within the jurisdiction, does not need to manage all user plane entities in the entire PDU session, reduces the number of messages in the middle of the user plane entity and reduces the workload.
  • the apparatus 7 shown in FIG. 7 may implement the access management entity or the session management entity of the embodiment shown in FIG. 3-7, wherein the apparatus 7 includes: a selecting unit 701. And a transceiver unit 702.
  • the selecting unit 701 is configured to select a first intermediate session management entity for the PDU session according to the location information of the user equipment UE and the protocol data unit PDU session requirement information.
  • the transceiver unit 702 is configured to send the location information of the UE and the PDU session requirement information to the first intermediate session management entity, where the location information of the UE and the PDU session requirement information are used to select a user plane. entity.
  • the PDU session requirement information includes one or more of a session and a service continuity SSC mode and a PDU session type.
  • the selecting unit 701 is configured to select, according to the location information of the UE and the protocol data unit PDU session requirement information, the first intermediate session management entity for the PDU session, including: selecting to simultaneously satisfy the PDU session requirement information, and the jurisdiction includes The intermediate session management entity of the serving base station indicated by the location information of the UE serves as the first intermediate session management entity.
  • the device 7 further includes a determining unit
  • a determining unit configured to: if the network device determines that there is no intermediate session management entity that satisfies the PDU session requirement and the jurisdiction includes the location information indication of the UE;
  • the selecting unit 701 is further configured to select a second intermediate session management entity that satisfies the PDU session requirement information, and select a third intermediate session management entity that has a serving base station whose jurisdiction includes the location information indication of the UE.
  • the PDU session requirement information includes a data transmission mode and a local data network name DNN.
  • the selecting unit 701 is configured to select, according to the location information of the UE and the protocol data unit PDU session requirement information, the first intermediate session management entity for the PDU session, including:
  • the intermediate session management entity of the mode acts as the first intermediate session management entity.
  • the device 7 further includes: a determining unit;
  • the determining unit is further configured to: if the network device determines that there is no serving base station that includes the location information indication of the UE and a local DN indicated by the local DNN, and supports data transmission included in the PDU session requirement information Mode intermediate session management entity;
  • the selecting unit 701 is further configured to select a second intermediate session management entity of the serving base station whose jurisdiction includes the location information indication of the UE, and the selection jurisdiction includes a local DN indicated by the local DNN included in the PDU session requirement information.
  • a third intermediate session management entity supporting a data transmission mode included in the PDU session requirement information is further configured to select a second intermediate session management entity of the serving base station whose jurisdiction includes the location information indication of the UE, and the selection jurisdiction includes a local DN indicated by the local DNN included in the PDU session requirement information.
  • the data transmission mode is a multi-homing Mutilhoming mode
  • the transceiver unit 701 is further configured to:
  • the uplink routing policy is used to control the UE to use an IP address anchored at an anchor user plane entity or a local IP address anchored at a local anchor user plane entity as a source address of the data packet;
  • the first intermediate session management entity generates an uplink offloading policy, and the uplink routing policy corresponding to the IP address of the anchor user plane entity is used to enable the first intermediate session management entity to generate an uplink routing policy; the uplink offloading policy is used to control the BP
  • the offloading is performed according to the source address of the data packet sent by the UE, and the uplink routing policy is used to instruct the UE to use the IP address anchored at the anchor user plane entity or use the local IP address anchored at the local anchor user plane entity as the source address. data.
  • the data transmission mode is an uplink classifier ULCL mode
  • the transceiver unit 702 is further configured to:
  • the uplink forwarding policy is used to control the uplink classifier ULCL anchored by the UE according to the quintuple and the application identifier of the data packet sent by the UE One or more are forwarded.
  • the selecting unit 701 is further configured to:
  • the target session management entity is selected.
  • the selecting unit 701 is configured to select a target session management entity, including:
  • the intermediate session management entity acts as the target intermediate session management entity; or
  • the network device If it is determined that there is no intermediate session management entity that satisfies the PDU session requirement information and the jurisdiction includes the target base station to which the UE is handed over; the network device respectively selects a second intermediate session management entity that satisfies the PDU session requirement information and The jurisdiction includes a third intermediate session management entity of the target base station to which the UE is handed over as the target intermediate session management entity.
  • the device 7 is a session management entity, and the device 7 further includes a determining unit.
  • a determining unit configured to determine PDU session requirement information according to the PDU session subscription information; or determine PDU session requirement information according to one or more of PDU session policy information and PDU session expectation information, and PDU session subscription information;
  • the selecting unit 701 is further configured to select an anchor user plane entity within the jurisdiction of the session management entity according to the PDU session requirement information;
  • the determining unit is further configured to determine, according to the location information of the UE, that the serving base station indicated by the location information of the UE is not connected to the anchor user plane entity.
  • the device 7 is a session management entity, and the session management device 7 further includes a determining unit.
  • the determining unit is configured to determine PDU session requirement information according to PDU session subscription information; or determine PDU session requirement information according to one or more of PDU session policy information and PDU session expectation information, and PDU session subscription information; PDU session The demand information includes a local DNN;
  • the determining unit is further configured to determine that the local DN indicated by the local DNN included in the PDU session requirement information is not located within the jurisdiction of the session management entity.
  • the device 7 is an access management entity.
  • the selecting unit 701 is further configured to select a session management entity.
  • the determining unit is further configured to determine that the serving base station indicated by the location information of the UE is not located within the jurisdiction of the session management entity.
  • the selecting unit 701 is further configured to select a fourth intermediate session management entity.
  • the transceiver unit 702 is further configured to receive the PDU session request and a reselection indication message from the session management entity, where the reselection indication message is used to instruct the access management entity to select the first intermediate session management entity .
  • the device 7 is an access management entity.
  • the selecting unit 701 is further configured to select a session management entity.
  • the determining unit is further configured to determine that the serving base station indicated by the location information of the UE is not located within the jurisdiction of the session management entity.
  • the selection unit 701 is further configured to select a fourth intermediate session management entity.
  • the transceiver unit 702 is further configured to receive the PDU session requirement information from the session management entity.
  • the determining unit is further configured to determine that the fourth intermediate session management entity does not satisfy the PDU session requirement information.
  • the device 7 is an access management entity.
  • the transceiver unit 702 is further configured to: when the requirement of the PDU session changes, receive new PDU session requirement information and a reselection indication message from the session management entity, where the reselection indication message is used to instruct the session management apparatus 7 to select The first intermediate session management entity.
  • the network device is an access management entity.
  • the transceiver unit is further configured to: when the demand of the PDU session changes, the network device receives new PDU session requirement information from the session management entity;
  • the determining unit is further configured to determine that the first intermediate session management entity does not satisfy the new PDU session requirement information.
  • the selecting unit 701 is further configured to select the target intermediate session management entity according to the location information of the UE and the new PDU session requirement information.
  • the device 7 is a session management entity, and the device 7 further comprises a determining unit. a determining unit, configured to determine PDU session requirement information according to the PDU session subscription information; or determine PDU session requirement information according to one or more of PDU session policy information and PDU session expectation information, and PDU session subscription information. The determining unit is further configured to determine that the fourth intermediate session management entity selected by the access management entity does not satisfy the PDU session requirement.
  • the transceiver unit 702 is further configured to send the identifier information of the first intermediate session management entity to the access management entity.
  • the apparatus 7 shown in FIG. 7 can implement the session management entity of the embodiment shown in FIG. 9 and FIG. 10, wherein the apparatus 7 includes: a selecting unit 701 and a transceiver unit. 702.
  • the selecting unit 701 is configured to select a first intermediate session management entity for the protocol data unit PDU session according to the protocol local network data name DNN.
  • the transceiver unit 702 is configured to send location information of the user equipment UE to the first intermediate session management entity, where the location information of the UE is used to select a user plane entity.
  • the selecting unit 701 performs the selecting, by the local DNN, the first intermediate session management entity for the PDU session, including:
  • the selecting unit 701 performs the selecting, by the local DNN, the first intermediate session management entity for the PDU session, including:
  • An intermediate session management entity supporting the local DN indicated by the local DNN is selected as the first intermediate session management entity.
  • the network device is a session management entity
  • the selecting unit 701 is further configured to:
  • the local DNN is determined based on information from the application function.
  • the transceiver unit 702 is further configured to:
  • the transceiver unit 702 is further configured to:
  • the user plane entity selected by the first intermediate session management entity supports both the local DNN and the UE location information
  • the first intermediate session management entity selects a user plane entity supporting the local DNN as a local anchor user plane entity according to the local DNN, and according to the The UE location information selects a user plane entity supporting the UE location information for an access network interface connected to the UE, wherein the local anchor user plane entity is configured to interface with the local DN.
  • the transceiver unit 702 is further configured to:
  • the transceiver unit 702 is further configured to:
  • the remote UE IP address is sent to the first intermediate session management entity, where the remote UE IP is used to instruct the first intermediate session management entity to determine an uplink traffic rule. .
  • the transceiver unit 702 is further configured to:
  • the application information is sent to the first intermediate session management entity to determine an uplink traffic distribution rule according to the application information, where the application information is an application identifier or an application corresponding to five At least one of the tuples.
  • the transceiver unit 702 is further configured to:
  • the transceiver unit 702 is further configured to:
  • the routing information between the local anchor network and the local data network DN identified by the local DNN is sent to the first intermediate session management entity, and the routing information is used to determine a forwarding path between the user plane entity and the local DN.
  • the device 7 may be an access management entity or a session management entity, and the device 7 may also be a field-programmable gate array (FPGA) or an application specific integrated circuit (application specific integrated circuit).
  • FPGA field-programmable gate array
  • ASIC application specific integrated circuit
  • SoC system on chip
  • CPU central processor unit
  • NP network processor
  • DSP digital signal processor
  • MCU Micro controller unit
  • PLD programmable logic device
  • an embodiment of the present invention further provides a network device 8.
  • the network device can be an access management entity or a session management entity, including:
  • the memory 803 is configured to store programs and data.
  • the memory may be a random access memory (English: Random Access Memory, RAM for short) or read only memory (English: Read Only Memory, ROM for short) or a flash memory.
  • the 803 can be located either alone in the communication device or inside the processor 801.
  • the processor 801 is configured to execute the program stored in the memory. When the program is executed, the processor 801 is configured to select a first PDU session according to location information of the user equipment UE and protocol data unit PDU session requirement information. Intermediate session management entity.
  • the transceiver 802 can be used as a separate chip, or can be a transceiver circuit in the processor 801 or as an input/output interface.
  • the transceiver 802 is configured to send the location information of the UE and the PDU session requirement information to the first intermediate session management entity, where the location information of the UE and the PDU session requirement information are used to select a user plane. entity.
  • the network device of the present embodiment and the session management device of FIG. 7 and the method processes of FIG. 3 to FIG. 6 and FIG. 9 and FIG. 10 are based on the same concept, and the technical effects thereof are also the same. Referring to the description of the session management apparatus of FIG. 7 and the method flow of FIGS. 3 to 6 and FIGS. 9 and 10, details are not described herein again.
  • the transceiver 802, the memory 803, and the processor 801 are optionally connected by a bus.
  • the network device 8 When the network device 8 is a chip, it may be a field-programmable gate array (FPGA), an application specific integrated circuit (ASIC), or a system on chip (SoC) for implementing related functions.
  • FPGA field-programmable gate array
  • ASIC application specific integrated circuit
  • SoC system on chip
  • CPU central processor unit
  • NP network processor
  • DSP digital signal processor
  • MCU microcontroller
  • PLD programmable Controller
  • PLD programmable logic device
  • chips may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • a software program it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transmission to another website site, computer, server or data center via wired (eg coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device that includes one or more servers, data centers, etc. that can be integrated with the media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)) or the like.
  • a magnetic medium eg, a floppy disk, a hard disk, a magnetic tape
  • an optical medium eg, a DVD
  • a semiconductor medium such as a solid state disk (SSD)
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to 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.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in or transmitted by a computer readable storage medium.
  • the computer instructions can be from a website site, computer, server or data center to another website site by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.) Transfer from a computer, server, or data center.
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).
  • the program can be stored in a computer readable storage medium, when the program is executed
  • the flow of the method embodiments as described above may be included.
  • the foregoing storage medium includes various media that can store program codes, such as a ROM or a random access memory RAM, a magnetic disk, or an optical disk.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de gestion de session, un appareil de réseau et un système de communication. L'utilisation de modes de réalisation de la présente invention pour sélectionner une entité de gestion de session intermédiaire selon des informations de position d'UE et des informations d'exigence de session PDU permet à l'entité de gestion de session intermédiaire à proximité de l'UE de fournir un service à la session PDU, réduisant ainsi le retard temporel de la transmission de données. En même temps, l'entité de gestion de session intermédiaire sélectionne une entité de plan utilisateur selon les informations de position d'UE et les informations d'exigence de PDU. L'entité de gestion de session intermédiaire est responsable de la gestion d'entités de plan utilisateur dans une plage spécifiée au lieu de gérer des entités de plan utilisateur d'une session de PDU entière, réduisant ainsi la complexité de gestion.
PCT/CN2018/085099 2017-05-05 2018-04-28 Procédé de gestion de session, appareil de réseau et système de communication WO2018202008A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18793911.1A EP3606275B1 (fr) 2017-05-05 2018-04-28 Procédé de gestion de session, appareil de réseau et système de communication
EP22164618.5A EP4090078A3 (fr) 2017-05-05 2018-04-28 Procédé de gestion de session et dispositifs correspondents
US16/664,481 US11706704B2 (en) 2017-05-05 2019-10-25 Managing user plane entities at different locations in a PDU session

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201710314201.2 2017-05-05
CN201710314201 2017-05-05
CN201810150678.6A CN108811011B (zh) 2017-05-05 2018-02-13 一种会话管理方法、网络设备和通信系统
CN201810150678.6 2018-02-13

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US16/664,481 Continuation US11706704B2 (en) 2017-05-05 2019-10-25 Managing user plane entities at different locations in a PDU session

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CN111615217A (zh) * 2019-02-25 2020-09-01 华为技术有限公司 一种会话建立方法及装置
CN111615217B (zh) * 2019-02-25 2023-11-21 华为技术有限公司 一种会话建立方法及装置
CN113796156A (zh) * 2019-05-06 2021-12-14 株式会社Ntt都科摩 用于处理服务请求的通信网络组件和方法
CN113796156B (zh) * 2019-05-06 2024-03-19 株式会社Ntt都科摩 用于处理服务请求的通信网络组件和方法
CN110475290A (zh) * 2019-07-23 2019-11-19 中国联合网络通信集团有限公司 一种会话切换方法及装置
CN110475290B (zh) * 2019-07-23 2023-04-28 中国联合网络通信集团有限公司 一种会话切换方法及装置
CN112468529A (zh) * 2019-09-09 2021-03-09 中国移动通信有限公司研究院 一种会话管理方法及设备
CN112468529B (zh) * 2019-09-09 2022-08-23 中国移动通信有限公司研究院 一种会话管理方法及设备
CN111092937A (zh) * 2019-12-04 2020-05-01 中兴通讯股份有限公司 会话创建方法、控制方法、会话创建系统、网元及介质

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