WO2018170704A1 - 一种会话建立方法、装置及系统 - Google Patents

一种会话建立方法、装置及系统 Download PDF

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Publication number
WO2018170704A1
WO2018170704A1 PCT/CN2017/077384 CN2017077384W WO2018170704A1 WO 2018170704 A1 WO2018170704 A1 WO 2018170704A1 CN 2017077384 W CN2017077384 W CN 2017077384W WO 2018170704 A1 WO2018170704 A1 WO 2018170704A1
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WO
WIPO (PCT)
Prior art keywords
session
message
entity
identifier
smf entity
Prior art date
Application number
PCT/CN2017/077384
Other languages
English (en)
French (fr)
Inventor
窦凤辉
金辉
欧阳国威
何岳
杨皓睿
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 to EP17901724.9A priority Critical patent/EP3598841B1/en
Priority to JP2019551708A priority patent/JP6989226B2/ja
Priority to KR1020197030236A priority patent/KR20190126147A/ko
Priority to EP21170011.7A priority patent/EP3923674B1/en
Priority to ES17901724T priority patent/ES2883339T3/es
Priority to ES21170011T priority patent/ES2939496T3/es
Priority to KR1020217039360A priority patent/KR102460382B1/ko
Priority to CN202011253766.2A priority patent/CN112512088A/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to US16/495,667 priority patent/US10798770B2/en
Priority to PCT/CN2017/077384 priority patent/WO2018170704A1/zh
Priority to EP22212407.5A priority patent/EP4221454A1/en
Priority to CN201780009623.7A priority patent/CN108781476B/zh
Publication of WO2018170704A1 publication Critical patent/WO2018170704A1/zh
Priority to US17/021,439 priority patent/US20210068190A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/38—Connection release triggered by timers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

Definitions

  • the embodiments of the present invention relate to the field of communications technologies, and in particular, to a session establishing method, apparatus, and system.
  • PDU protocol data unit
  • UE User Equipment
  • Date Network Date Network
  • SSC mode Session and Service Continuity mode 1 and SSC mode 2.
  • FIG. 1a shows a session establishment procedure of SSC mode 1, that is, a network side (for example, a Session Management Function (SMF) entity) releases a PDU session and instructs the UE to immediately establish a new DN.
  • SMF Session Management Function
  • the PDU session and then the SMF entity receives the first message sent by the UE, and the SMF entity selects a new User Plan Function (UPF) entity to implement the establishment of the PDU session.
  • UPF User Plan Function
  • the SMF entity instructs the UE to establish a new PDU session within a preset time, and then the SMF entity selects a new one when receiving the first message sent by the UE.
  • the SMF entity establishes a new PDU session, and finally the SMF releases the old PDU session after the preset time.
  • the AMF entity re-executes the SMF entity when forwarding the first message.
  • the selection process, and the newly selected SMF entity will still perform the process of selecting the UPF entity once, which will result in lower processing efficiency.
  • the SMF entity selected by the AMF entity and the SMF entity that triggers the re-establishment of the PDU session are not the same SMF entity, the UPF selected by the newly selected SMF entity and the UPF entity selected by the SMF entity that triggers the re-establishment of the PDU session are inconsistent. Therefore, it cannot be guaranteed that the user plane can be preferentially reconstructed after the PDU session is reconstructed.
  • the present application provides a method, an apparatus, and a system for establishing a session, which are used to solve the problem that the AMF entity needs to reselect the SMF entity when forwarding the first message in the prior art.
  • an embodiment of the present invention provides a session establishment method, including: a user equipment UE establishes a first session by using a session management function SMF entity; and a UE receives a first message sent by a mobility management function AMF entity, where the first message is used. Instructing the UE to send a request for the second session; the UE assigns the same identity as the first session to the second session; the UE sends a second message to the AMF entity for the UE to request to establish the second session, and the second message carries the second message.
  • the identifier of the session, the identifier of the second session is used to instruct the AMF entity to send the second message to the SMF entity.
  • the embodiment of the present invention provides a method for establishing a session, by carrying the identifier information in the second message, and then the AMF entity sends the second message to the SMF entity specified by the identifier information according to the identifier information, because the SMF entity triggers the user equipment to send The purpose of the second message is to re-establish the session.
  • the second message sent by the user equipment needs to be forwarded to the SMF entity through the AMF entity, and the AMF entity needs to perform the process of selecting the SMF entity when forwarding the second message.
  • the problem that the AMF entity needs to re-execute the process of selecting the SMF entity when the second message is received may be avoided by the identifier information, and the SMF entity selected by the AMF entity and the triggered user may be avoided.
  • the problem that the SMF entity of the second message is inconsistent is sent by the device.
  • the SMF entity does not need to perform the process of reselecting the UPF entity again after receiving the identifier information, because the SMF entity triggers the UE.
  • the second message is sent because the SMF entity is triggering the UE to send the second message.
  • the UPF entity for example, the first UPF entity
  • the UPF entity that establishes a session with the UE at this time has failed to satisfy the user's needs, and selects a suitable UPF entity (for example, the first UPF entity) to re-establish the relationship with the UE.
  • the second session which can further enable the finally established second session to preferentially materialize the user plane.
  • the first message carries the first indication information that is used to indicate that the UE allocates the same identifier as the first session for the second session, and the UE is the second The session is assigned the same identifier as the first session, and the UE allocates the same identifier as the first session to the second session according to the first indication information.
  • the UE allocates the same identifier as the first session to the second session, including: acquiring, by the UE a session service continuity mode of a session; the UE determines that the session service continuity mode of the first session is the first mode, and assigns the same identity to the first session for the second session.
  • the first message carries the identifier information, where the identifier information is used by the AMF entity
  • the second message is sent to the identifier information SMF entity; the second message carries the identifier information.
  • the corresponding relationship between the identifier information and the SMF entity identifier is stored in the AMF entity.
  • the first message carries a data network DN indicating the second session The second indication information that is the same as the DN of the first session.
  • an embodiment of the present invention provides a session establishment method, including: a user equipment UE establishes a first session by using a session management function SMF entity; and a UE sends a mobility management function, and the AMF entity sends an indication for sending the UE for establishing a first message of the request of the second session; the UE sends a second message to the AMF entity, where the second message is used to request to establish a second session, where the first message carries a message for instructing the AMF entity to send the second message to the identifier information. Identification information of the SMF entity.
  • the first message is configured to be used to indicate that the UE carries the identifier information in the second message, and the indication that the UE carries the identifier information in the second message
  • the third indication information specifically, after receiving the third indication information, the UE carries the identifier information in the second message.
  • the session service continuity mode of the first session is obtained, and the UE determines that the session service continuity mode of the first session is the second mode, and the UE determines the identifier of the first session as the identification information.
  • the second mode is the session service continuity mode SSC2.
  • the SSC2 means that the network side allows the UE to establish a second session before the first session is released.
  • the second session is the same as the data network DN of the first session.
  • the UE receives the identifier information of the SMF entity configuration by using the AMF entity.
  • the first message carries the fourth indication information
  • the fourth indication information is used. Instructing the UE to use the identifier of the first session as the identifier information, and the user equipment determines the identifier of the first session as the identifier information according to the fourth indication information, that is, the second message that the UE requests to establish the second session carries at least the identifier of the first session.
  • the second message carries both the identifier of the second session and the identifier of the first session.
  • the first message is used to indicate that the UE establishes the first session
  • the second indication information of the second session in which the data network DN is the same.
  • an embodiment of the present invention provides a session establishment method, including: a mobility management function AMF entity sends a first message for instructing a UE to send a request for establishing a second session to a user equipment UE, and a mobility management function
  • the AMF entity receives a second message that carries the identifier information, where the identifier information is used to indicate that the AMF entity sends the second message to the session management function SMF entity associated with the identifier information, and the second message is used to request to establish the second session.
  • the AMF entity sends the second message to the SMF entity according to the identification information.
  • the first message carries third indication information that is used to indicate that the UE carries the identifier information in the second message.
  • the identifier information is configured by the SMF entity, and the AMF entity sends the first message to the UE.
  • the method provided by the embodiment of the present invention further includes: the AMF entity receives a first request message sent by the SMF entity to indicate a mapping relationship between the AMF entity establishment identifier information and the SMF entity identifier; and the AMF entity sends the second message according to the identifier information.
  • the SMF entity identifier associated with the identifier information includes: the AMF entity obtains the SMF entity identifier corresponding to the identifier information according to the identifier information, and the AMF entity sends the second message to the SMF entity identifier that is associated with the identifier information. SMF entity.
  • the method provided by the embodiment of the present invention further includes: the AMF entity receives, by the SMF entity, a first request message that is used by the SMF entity to indicate that the AMF entity saves the mapping relationship between the identifier of the first session and the SMF entity, where the first session is sent by the SMF entity.
  • the AMF entity saves the mapping relationship between the identifier of the first session and the SMF entity according to the first request message.
  • the first message is further configured to indicate that the UE allocates the second session With the first meeting If the first indication information of the same identifier is used, the identifier information is the identifier of the second session.
  • the first message carries an identifier for indicating that the UE is to use the first session
  • the fourth indication information as the identification information.
  • the first message is used to indicate that the UE is established with the first session
  • the second indication information of the second session in which the data network DN is the same.
  • an embodiment of the present invention provides a session establishment method, including: a session management function SMF entity sends a first request message for instructing an AMF entity to send a first message to a user equipment UE, to a mobility management function AMF entity, The first message is used to instruct the UE to send a second message for establishing a second session; the session management function SMF entity receives a second message sent by the mobility management function AMF entity for indicating establishment of the second session, and the SMF entity according to the second The message establishes a second session with the user equipment UE.
  • the first message carries the third indication information that is used to indicate that the UE carries the identifier information in the second message.
  • the embodiment of the present invention before the session management function SMF entity sends the first request message to the AMF entity, the embodiment of the present invention The method further includes: the SMF entity is configured to indicate that the AMF entity sends the second message to the SMF entity, and the first request message is further used to indicate that the AMF entity establishes a mapping relationship between the identifier information and the SMF entity identifier.
  • the first request message is further used to indicate that the AMF entity establishes the first session The identifier and the relationship between the SMF entity
  • the second message further includes third indication information for instructing the UE to allocate the same session identifier for the first session and the second session, where the identifier information is an identifier of the second session, the first session A session established between the SMF entity and the UE before the first request message is sent by the SMF entity.
  • the first message carries an identifier for indicating that the UE sends the first session
  • the identification information is an identifier of the first session.
  • the first message is further configured to indicate that the UE is established and the first The second indication information of the second session of the same data network DN of one session.
  • an embodiment of the present invention provides a user equipment, including: an establishing unit, configured to establish a first session by using a session management function SMF entity, and a receiving unit, configured to receive, by the mobility management function, an AMF entity, used to indicate a user
  • the device UE sends a first message for establishing a request for the second session; an allocating unit, configured to allocate the same identifier as the first session to the second session; and a sending unit, configured to send, to the AMF entity, the UE to request to establish the first A second message of the second session, the second message carrying an identifier for indicating a second session in which the AMF entity sends the second message to the SMF entity.
  • the first message carries, by the UE, the first indication information that is used to indicate that the UE allocates the same identifier as the first session, the allocation unit, and the specific use And assigning, according to the first indication information, the same identifier as the first session to the second session.
  • the user equipment further includes: an acquiring unit, configured to obtain session service continuity of the first session a mode; an allocation unit, configured to determine that the session service continuity mode of the first session is the first mode, and assign the same identity as the first session to the second session as the identification information.
  • an embodiment of the present invention provides a user equipment, including: an establishing unit, where a first session is established by a session management function SMF entity, and a receiving unit, configured to receive, by the mobility management function, an AMF entity, used to indicate a user equipment UE.
  • the user equipment further includes: an acquiring unit, configured to acquire a session service continuity mode of the first session; and a determining unit, configured to determine the first session
  • the session service continuity mode is the second mode, and the identifier of the first session is determined as the identification information.
  • the user equipment further includes: a determining unit, configured to carry the indication in the determining the first message
  • the UE uses the identifier of the first session as the fourth indication information of the identifier information, and determines the identifier of the first session as the identifier information is carried in the second message, where the fourth indication information is used to indicate that the UE identifies the identifier of the first session.
  • the identification information As the identification information.
  • the receiving unit is further configured to receive the identifier information of the SMF entity configuration by using the AMF entity.
  • the first message is used to indicate that the UE establishes the first session
  • the second indication information of the second session in which the data network DN is the same.
  • an embodiment of the present invention provides a mobility management function AMF entity, including: a sending unit, configured to send, to a user equipment UE, a first message for instructing a UE to send a request for establishing a second session; And a second message for receiving the identifier information sent by the user equipment, where the identifier information is used to indicate that the AMF entity sends the second message to the session management function SMF entity associated with the identifier information, and the second message is used to indicate that the second session is established. And a sending unit, configured to send, according to the identifier information, the second message to the SMF entity associated with the identifier information.
  • the first message carries the third indication information that is used to indicate that the UE carries the identifier information in the second message.
  • the identifier information is configured by the SMF entity, and the receiving unit is further configured to receive the sending by the SMF entity.
  • the first request message is used to indicate that the AMF entity establishes a mapping relationship between the identifier information and the SMF entity identifier.
  • the AMF entity further includes: an establishing unit, configured to establish a mapping relationship between the identifier information and the SMF entity identifier according to the first request message.
  • the AMF entity further includes: an obtaining unit, configured to acquire, according to the identifier information, an SMF entity identifier that has a corresponding relationship with the identifier information; the sending unit is specifically configured to: send the second message to the SMF entity associated with the SMF entity identifier.
  • the receiving unit is further configured to receive, by the SMF entity, The entity saves a first request message of a mapping relationship between the identifier of the first session and the SMF entity identifier, where the first session is a session established between the SMF entity and the UE before the SMF entity sends the first request message;
  • the AMF entity further includes: saving And a unit, configured to save, according to the first request message, a mapping relationship between the identifier of the first session and the SMF entity.
  • the eighth aspect of the present invention provides a session management function SMF entity, including: a sending unit, configured to send, to a mobility management function AMF entity, a first request for instructing an AMF entity to send a first message to a user equipment UE a message, the first message is used to instruct the UE to send a second message for establishing a second session, and the receiving unit is configured to receive a second message sent by the mobility management function AMF entity to indicate that the second session is established; And configured to establish a second session with the user equipment UE according to the second message.
  • the first message carries the third indication information that is used to indicate that the UE carries the identifier information in the second message.
  • the SMF entity further includes: a configuration unit, configured to indicate that the AMF entity is to be the second
  • the identifier is sent to the SMF entity.
  • the first request message is further used to indicate that the AMF entity establishes a mapping relationship between the identifier information and the SMF entity.
  • an embodiment of the present invention provides a mobility management function AMF entity, including a memory, a processor, a bus, and a transceiver.
  • the memory stores code and data, and the processor and the memory are connected through a bus, and the processor runs in the memory.
  • the code causes the AMF entity to perform the session establishment method described in any one of the third aspect to the sixth possible implementation of the third aspect.
  • an embodiment of the present invention provides a session management function SMF entity, including a memory, a processor, a bus, and a transceiver, where the code stores data and data, the processor and the memory are connected through a bus, and the processor runs the code in the memory.
  • the SMF entity is caused to perform the session establishment method described in any one of the fourth aspect to the fifth possible implementation of the fourth aspect.
  • a user equipment includes a memory, a processor, a bus, and a transceiver, wherein the memory stores code and data, the processor and the memory are connected by a bus, and the processor runs the code in the memory to cause the The user equipment performs the session establishment method described in the first aspect to the fourth possible implementation of the first aspect or the second aspect to the fourth possible implementation of the second aspect.
  • an embodiment of the present invention provides a computer readable storage medium, including instructions, when operating on an AMF entity, causing an AMF entity to perform the third aspect to the sixth possible implementation manner of the third aspect.
  • the embodiment of the present invention provides a session establishment system, including the seventh aspect to the seventh aspect
  • the AMF entity described in a third possible implementation manner, the SMF entity described in any one of the second aspect to the second possible implementation of the eighth aspect, and the second aspect to the second aspect A user equipment as described in any one of the possible implementations, or the user equipment described in any one of the sixth aspect to the fourth possible implementation of the sixth aspect.
  • FIG. 1a is a schematic flowchart 1 of a session establishment method provided in the prior art
  • FIG. 1b is a schematic flowchart 2 of a session establishment method provided in the prior art
  • 2a is a system architecture diagram of a session establishment method according to an embodiment of the present invention.
  • FIG. 2b is a schematic structural diagram of an AMF entity according to an embodiment of the present invention.
  • 2c is a schematic structural diagram of an SMF entity according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a UE according to an embodiment of the present disclosure
  • FIG. 3 is a schematic flowchart 1 of a session establishing method according to an embodiment of the present disclosure
  • FIG. 4 is a second schematic flowchart of a method for establishing a session according to an embodiment of the present disclosure
  • FIG. 5 is a schematic flowchart 3 of a method for establishing a session according to an embodiment of the present disclosure
  • FIG. 6 is a schematic flowchart 4 of a method for establishing a session according to an embodiment of the present disclosure
  • FIG. 7 is a schematic flowchart 5 of a method for establishing a session according to an embodiment of the present disclosure
  • FIG. 8 is a schematic diagram of a specific use flow of a session establishment method according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic diagram of a specific use flow of a session establishment method according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic diagram of a specific use flow of another session establishing method according to an embodiment of the present disclosure.
  • Figure 11a is a schematic structural diagram 1 of an AMF entity according to an embodiment of the present invention.
  • FIG. 11b is a schematic structural diagram 2 of an AMF entity according to an embodiment of the present disclosure.
  • Figure 12a is a schematic structural diagram 1 of an SMF entity according to an embodiment of the present invention.
  • FIG. 12b is a second schematic structural diagram of an SMF entity according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic structural diagram 1 of a user equipment according to an embodiment of the present disclosure.
  • FIG. 13b is a schematic structural diagram 2 of a user equipment according to an embodiment of the present disclosure.
  • FIG. 13c is a schematic structural diagram 3 of a user equipment according to an embodiment of the present invention.
  • the words “first”, “second” and the like are used to distinguish the same or similar items whose functions and functions are substantially the same, in the field.
  • the skilled person will understand that the words “first”, “second” and the like do not limit the number and order of execution.
  • the session service continuity mode 1 in the embodiment of the present invention refers to that when the SMF entity determines that the UPF entity needs to be re-selected to establish a new session, the SMF entity first releases the first established between the user equipment and the first UPF entity.
  • the session as shown in Figure 1a, then the SMF entity immediately sends a request message (e.g., the first message shown in Figure Ia) to the user equipment via the AMF entity to indicate re-establishment of the session.
  • the second session between the user equipment and the second UPF entity is established according to the session establishment connection request sent by the user equipment (for example, the second message in the following embodiment), and finally the second UPF served by the second session.
  • the entity sends data. That is, the first session has been released by the SMF entity before the second session is established.
  • the session service continuity mode 2 is that when the SMF entity determines that the UPF entity needs to be re-selected to establish a new session, the SMF entity first sends a first message to the user equipment through the AMF entity, where the first message is used to indicate that the user equipment is within the preset time. Sending a session establishment connection request (for example, a second message), so that the SMF entity establishes a second session between the second UPF entity and the user equipment by using the second UPF entity, and the SMF entity releases the first session after a preset time. That is, the first session established between the first UPF entity and the user equipment. That is, the first session is released by the SMF entity after a preset time after the second session is established.
  • a session establishment connection request for example, a second message
  • the first mode in the embodiment of the present invention is the session service continuity mode 1, that is, SSC1
  • the second session service continuity mode is the session service continuity mode 2, that is, SSC2.
  • the SSC1 refers to that the first session may be triggered by the network side and the UE is notified to establish the second session immediately, and the second session is the same as the data network DN of the first session. Under SSC1, the first session is released first, after which the second session is established.
  • the SSC2 refers to that the UE may be triggered by the network side to establish a second session, and the second session is the same as the data network DN of the first session. Under SSC2, the second session is established first, after which the first session is released.
  • the SMF entity establishes a session between the user equipment and the UPF entity whether the sampling session service continuity mode 1 or the session service continuity mode 2, and the session establishment connection request needs to be forwarded to the SMF entity through the AMF entity, so
  • the AMF entity selects the SMF entity, which not only causes the processing efficiency to be low, but also causes the newly selected SMF entity to reselect the UPF entity when the newly selected SMF entity is inconsistent with the SMF entity that triggers the reestablishment session. problem.
  • the first SMF entity triggers the user equipment to send a session establishment connection request (the first SMF entity triggers the user equipment to send the session establishment connection request before selecting to serve the user equipment by using the second UPF entity, and the second UPF entity is the first SMF entity according to the The location of the user equipment, the data feature sent, and the location of the second UPF entity are UPF entities selected by the user equipment to improve the user function plane.
  • the session establishment connection request is forwarded to the SMF entity through the AMF entity, so that AMF may exist.
  • the entity sends a session establishment connection request to the second SMF entity, so that the second SMF entity reselects the UPF entity after receiving the session establishment connection request, and the UPF entity reselected by the second SMF entity may be the third UPF entity. It may be the first UPF entity, which is inconsistent with the UPF entity that the first SMF entity wishes to provide for the user equipment.
  • the embodiment of the present invention carries the identifier information in the session establishment connection request (ie, the second message), so that the AMF entity forwards the connection request to the trigger according to the identifier information after receiving the session establishment connection request sent by the user equipment.
  • the user equipment sends the SMF entity that establishes the connection establishment request, thereby avoiding the problem that the AMF entity reselects the SMF entity and the SMF entity reselects the UPF entity.
  • FIG. 2a is a system architecture diagram of a session establishment method according to an embodiment of the present invention, including a mobility management function AMF entity 10, one or more session management function SMF entities 20, and a Or a plurality of user equipments UE30, a data network (DN) 40, one or more user plane function entities 50, an access station ((Radio) Acess Node, (wireless) access station) 60, a packet control function ( Packet Control Function (PCF) entity 70, an application function (AF) entity 80, and a standard data management (UDM) entity 90 for storing user subscription information and an authentication service function (Authentication Server Function, AUSF) Entity 00.
  • AMF entity Packet Control Function
  • SMF Sess Node
  • AF application function
  • UDM standard data management
  • the mobility management function AMF entity 10 is configured to select a session connection establishment request sent by the UE 30.
  • the SMF entity is selected such that the selected SMF entity establishes a session between the UE 30 and the UPF entity 50.
  • the AMF entity 10 is further configured to forward the first message sent by the SMF entity to the user equipment, where the first message is used to indicate that the user equipment sends a second message requesting to establish the second session (for example, a session connection establishment request message).
  • the second message is used to indicate that the second session is established, so that after receiving the second message, the SMF entity may establish a second session between the UE 30 and the UPF entity according to the second message.
  • the AMF entity 10 stores a mapping relationship between the identifier of the session and the SMF entity that establishes the session, and is used to establish a mapping relationship between the identifier information and the SMF entity according to the identifier information configured by the SMF entity.
  • the SMF entity 20 is configured to re-allocate the UPF according to the location information of the UE 30 or the characteristics of the data sent by the UE 30 or the location between the UPF 50 and the UE 30, and re-establish the UE between the UE and the newly allocated UPF. Sessions, which improve the rebuilt session, optimize the user plane.
  • the SMF entity 20 is further configured to configure identification information, which is used to instruct the AMF entity to send the second message to the SMF entity.
  • the session management function entity 20 is further configured to establish a Session session between the UE 30 and the UPF entity 50, for example, a Protocol Data Unit (PDU) session, the PDU Session is used to connect the UE 30 with the DN 40, and the PDU Session is used for Provide PDU packets.
  • PDU Protocol Data Unit
  • a plurality of user equipments UE30 are configured to communicate with the DN according to the established session.
  • Data network DN40 an external network used to provide data services.
  • the access site 60 is configured to provide data services for the UE 30, for example, to receive data transmitted by the UE 30, or to transmit data to the UE 30.
  • the access site 60 may be a base station during actual use.
  • a base station may be a device that communicates with a user equipment (User Equipment, UE) or other communication station, such as a relay station, and the base station may provide communication coverage of a specific physical area.
  • UE User Equipment
  • the PCF entity 70 is used as an interface between the radio frequency part and the packet network (IP network).
  • the AF entity 80 is used to play an role in affecting routing.
  • the AMF entity 10 and the SMF entity 20 communicate via an interface N11.
  • the AMF entity 10 and the UE 30 communicate through the interface N1, the AMF entity 10 and the access site 60 communicate through the interface N2, and the AMF entity 10 communicates with the AUSF entity 00 through the interface N12, and the AMF entity 10 and the UDM entity pass through
  • the interface N8 communicates, the AMF entity 10 communicates with the PCF entity through the interface N15, the SMF entity 20 communicates with the UDM entity 90 via the interface N10, and the SMF entity 20 communicates with the UPF entity 50 via the interface N4, the UPF entity 50 and the data
  • the networks 40 communicate with each other through the interface N6, and the PCF entity communicates with the AF entity through the interface N5.
  • FIG. 2b is a schematic structural diagram of an AMF entity according to an embodiment of the present invention.
  • the AMF entity 10 includes a processor 101, a transceiver 102, a memory 104, and a bus 103.
  • the transceiver 102, the processor 101, and the memory 104 are connected to each other through a bus 103.
  • the bus 103 may be a PCI bus or an EISA bus.
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 2b, but it does not mean that there is only one bus or one type of bus.
  • the memory 104 is used to store program codes and data of the AMF entity 10.
  • the transceiver 102 is configured to support the AMF entity 10 to communicate with other devices.
  • the processor 101 is configured to support the AMF entity 10 to execute program code and data stored in the memory 104 to implement a session establishment method provided by an embodiment of the present invention.
  • FIG. 2c is a schematic structural diagram of an SMF entity according to an embodiment of the present invention.
  • the SMF entity 20 includes a processor 201, a transceiver 202, a memory 204, and a bus 203.
  • the transceiver 202, the processor 201, and the memory 204 are connected to each other through a bus 203.
  • the bus 203 may be a PCI bus or an EISA bus.
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 2c, but it does not mean that there is only one bus or one type of bus.
  • the memory 204 is used to store program codes and data of the SMF entity 20.
  • the transceiver 202 is configured to support the SMF entity 20 to communicate with other devices.
  • the processor 201 is configured to support the SMF entity 20 to execute the program code and data stored in the memory 204 to implement a session establishment method provided by the embodiment of the present invention.
  • FIG. 2d is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment 30 includes a processor 301, a transceiver 302, a memory 304, and a bus 303.
  • the transceiver 302, the processor 301, and the memory 304 are connected to each other through a bus 303.
  • the bus 303 may be a PCI bus or an EISA bus.
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 2d, but it does not mean that there is only one bus or one type of bus.
  • the memory 304 is used to store program codes and data of the user equipment 30.
  • the transceiver 302 is configured to support the user equipment 30 to communicate with other devices.
  • the processor 301 is configured to support the user equipment 30 to execute the program code and data stored in the memory 304 to implement a session establishing method provided by the embodiment of the present invention.
  • the UE may be distributed throughout the wireless network, and each UE may be static or mobile.
  • the UE may be a terminal, a mobile station, a subscriber unit, a station, or the like.
  • the UE may be a cellular phone, a personal digital assistant (PDA), a wireless modem (Modem), a wireless communication device, a handheld, a laptop computer, a cordless phone (cordless) Phone), wireless local loop (WLL) station, etc.
  • PDA personal digital assistant
  • Modem wireless modem
  • WLL wireless local loop
  • the UE When the UE is applied to the M2M mode communication, the UE may be referred to as an M2M terminal, and may specifically be a smart meter, a smart home appliance, or the like that supports M2M communication.
  • a session establishment method provided by an embodiment of the present invention includes:
  • the user equipment establishes a first session by using a session management function SMF entity.
  • the session management function SMF entity sends a first request message to the mobility management function AMF entity, where the first request message is used to instruct the AMF entity to send the first message to the user equipment UE, where the first message is used to instruct the UE to send the A request to establish a second session.
  • the first message in the embodiment of the present invention may be a session release notification message, where the session release notification message is used to instruct the UE to send a second message, that is, a session connection establishment request message.
  • the content carried by the first message may also be different, for example, if the SMF entity adopts the session service continuity mode 1 and the user.
  • a session is established between the devices, and the first message carries a session cause value, where the session cause value may be a re-establishment of the second session.
  • the SMF entity establishes a session with the user equipment by using the session service continuity mode 2
  • the first The message carries the session release time and the identifier information of the SMF entity configuration, or the first message carries the session release time and the session release cause value, and the session release cause value is a replacement UPF entity.
  • the AMF entity receives the first request message.
  • the AMF entity sends a first message to the UE, where the first message is used to instruct the UE to send a request for establishing a second session.
  • the UE sends a second message to the AMF entity, where the second message carries the identifier information, where the identifier information is used to indicate that the AMF entity sends the second message to the SMF entity, and the second message is used to indicate that the second session is re-established.
  • the AMF entity receives the second message.
  • the AMF entity sends the second message to the SMF entity associated with the identifier information according to the identifier information.
  • the SMF entity receives the second message sent by the AMF entity.
  • the SMF entity re-establishes a second session with the UE by using the first user plane function UPF entity according to the second message.
  • the embodiment of the present invention provides a method for establishing a session, by carrying the identifier information in the second message, and then the AMF entity sends the second message to the SMF entity specified by the identifier information according to the identifier information, because the SMF entity triggers the user equipment to send The purpose of the second message is to re-establish the session.
  • the second message sent by the user equipment needs to be forwarded to the SMF entity through the AMF entity, and the AMF entity needs to perform the process of selecting the SMF entity when forwarding the second message.
  • the problem that the AMF entity needs to re-execute the process of selecting the SMF entity when the second message is received may be avoided by the identifier information, and the SMF entity selected by the AMF entity and the triggered user may be avoided.
  • the problem that the SMF entity of the second message is inconsistent is sent by the device.
  • the SMF entity does not need to perform the process of reselecting the UPF entity again after receiving the identifier information, because the SMF entity triggers the UE.
  • the second message is sent because the SMF entity is triggering the UE to send the second message.
  • the UPF entity for example, the first UPF entity
  • the UPF entity that establishes a session with the UE at this time has failed to satisfy the user's needs, and selects a suitable UPF entity (for example, the first UPF entity) to re-establish the relationship with the UE.
  • the second session which can further enable the finally established second session to preferentially materialize the user plane.
  • the scenario applied by the embodiment of the present invention is that the UE and the SMF have established the first session.
  • the SMF entity determines that the UPF entity serving the first session cannot satisfy the requirement, and selects a suitable first UPF entity for the UE to establish the second session.
  • the session service continuity mode formed between the UE and the UPF entity may be the above-described session service continuity mode 1 and session service continuity mode 2, but the different session service continuity mode causes the SMF entity and the UE to transmit when communicating
  • the content of the information is different, and the timing of releasing the first session by the SMF entity is also different.
  • the SMF entity in the session service continuity mode 1 has released the first session before the second session is established, and the SMF entity in the session service continuity mode 2 The first session is released after the second session is established and the session release time is reached.
  • the first scenario is introduced as the session service continuity mode 1 as an example.
  • the first request message is further used to indicate that the AMF entity establishes a mapping relationship between the SMF entity identifier and the identifier of the first session.
  • the first request message carries the first The message and the notification message, wherein the first message carries a session cause value, wherein the session cause value is a re-establishment of the second session, and the notification message is used to indicate that the AMF entity re-establishes the session because the UPF entity is replaced
  • the embodiment of the present invention is Before step S103, the method further includes:
  • the AMF entity saves the mapping relationship between the identifier of the first session and the SMF entity according to the notification message.
  • the identifier of the first session is used to uniquely identify the first session.
  • the identifier of the first session may be set according to requirements, and the mapping relationship between the identifier of the first session and the SMF entity may be stored in the form of a form in the AMF entity. In the storage device.
  • the embodiment of the present invention may further include:
  • the user equipment allocates the same identifier as the first session to the second session, and adds the identifier of the second session to the second message as the identifier information.
  • the identifier of the second session is used to uniquely identify the second session.
  • the user equipment determines that the identifier of the second session is added to the second message, where the identifier of the second session is used to instruct the AMF entity to send the second message to the SMF.
  • An entity, the SMF entity being an SMF entity associated with the second identity.
  • step S109 in the embodiment of the present invention can be implemented in the following manner:
  • S1091a The UE allocates the same identifier as the first session to the second session according to the first indication information.
  • the first indication information is sent to the user equipment by using the first message, and the first indication information is used to indicate that the UE allocates the same identifier as the first session for the second session.
  • step S109 in the embodiment of the present invention can also be implemented in the following manner:
  • S1091b The user equipment acquires a session service continuity mode of the first session.
  • the user equipment can acquire the session service continuity mode of the first session by interacting with other devices.
  • the UE obtains the session service continuity mode of the first session, which may be configured by the SMF entity when the UE establishes the first session, or may be updated to the UE by the SMF entity after the first session is established.
  • Specific implementation methods include:
  • the UE may be configured with an SSC mode selection policy for determining an association of an application or a group of applications with the SSC mode.
  • the UE determines the SSC mode to establish a session according to the SSC mode selection policy, and the UE carries the requested SSC mode in the session establishment request message, and the SMF entity accepts the SSC mode requested by the UE, or is based on the subscription and operation.
  • the quotient policy or the like modifies the requested SSC mode, and finally the SMF entity determines the SSC mode of the session and notifies the UE of the selected or accepted SSC mode.
  • the UE may also not carry the SSC mode in the session establishment request message, and the SMF directly determines the SSC mode of the session based on the UE subscription and the operator policy, and finally the SMF entity notifies the UE of the selected or accepted SSC mode.
  • S1092b The user equipment determines that the session service continuity mode of the first session is the first mode, and allocates the same identifier as the first session to the second session.
  • the second message in the embodiment of the present invention further includes identifier information, where the identifier information is used to indicate that the AMF entity sends the second message to the SMF entity associated with the identifier information.
  • the embodiment of the present invention further includes:
  • the SMF entity configures the identifier information.
  • the identifier information configured by the SMF entity is forwarded to the user equipment by the AMF entity in the form of a first message, where the first message further carries the identifier information, where the first message is further used to indicate that the user equipment adds the identifier information in the second message.
  • the first request message further carries the identifier information, where the first request message is further used to indicate that the mapping relationship between the AMF entity and the SMF entity identifier is established, and the method provided by the embodiment of the present invention is performed before step S106. Also includes:
  • the identifier information is the indication information for uniquely identifying the identifier of the SMF entity, and may be a number or other information, which is not limited by the embodiment of the present invention.
  • the SMF entity identifier is used to uniquely identify the SMF entity, and may be an SMF entity.
  • the MAC address can also be the product number of the SMF entity. For example, if the identifier information is 101 and the SMF entity identifier is the first identifier, the AMF entity can establish the following mapping relationship in its storage device, as shown in Table 1. .
  • the AMF entity establishes a mapping relationship between the identifier information and the SMF entity identifier according to the first request message.
  • the second message may carry the identifier information, and may also carry the identifier of the second session. Therefore, the implementation manner of step S106 is different.
  • step S106 can be implemented in the following manner:
  • the AMF entity determines, according to the identifier information, an SMF entity that has a mapping relationship with the identifier information.
  • the AMF entity may determine, according to the identifier information, an SMF entity that has a mapping relationship with the identifier information from a mapping relationship between the pre-established identifier information and the SMF entity.
  • the AMF entity sends the second message to the SMF entity that has a mapping relationship with the identifier information.
  • step S106 can be implemented in the following manner:
  • the AMF entity determines, according to the identifier of the second session, an SMF entity associated with the identifier of the second session.
  • the AMF entity determines, according to the identifier of the second session, the SMF entity associated with the identifier of the second session from the mapping relationship between the identifier of the first session established in step S108 and the SMF entity. This is because the identifier of the second session is the same as the identifier of the first session. Therefore, the SMF entity associated with the identifier of the second session can be determined by the identifier of the second session.
  • the AMF entity sends the second message to the SMF entity associated with the identifier of the second session.
  • the second message may carry the identifier of the second session.
  • the mapping relationship between the identifier of the first session and the SMF entity identifier needs to be established in the AMF entity.
  • the AMF entity needs to establish the mapping relationship between the identifier information and the SMF entity, and may carry both the identifier of the first session and the identifier information, so that the AMF entity needs to establish the identifier of the first session and the SMF entity.
  • the first message in the embodiment of the present invention further includes second indication information, where the second indication information is used to indicate that the data network DN of the second session is the same as the DN of the first session.
  • the user equipment may determine, according to the second indication information, that the data network DN of the second session is the same as the DN of the first session.
  • the method provided by the embodiment of the present invention further includes:
  • the SMF entity releases the first session established between the user equipment and the second UPF entity.
  • the second scenario is introduced as the session service continuity mode 2 as an example.
  • the SMF entity may or may not configure the identifier information, and the SMF entity configuration identifier and the SMF do not configure the content of the first request message to be different. Therefore, the following describes:
  • the SMF entity configures the identifier information, where the identifier information is used to indicate that the AMF entity sends the second message to the SMF entity associated with the identifier information.
  • the first request message sent by the SMF entity to the AMF entity carries the identifier information and the first message, where the first message carries the identifier information and the session release time, and the first message is used to indicate that the UE is in the session release time.
  • a request to establish a second session is sent within.
  • step S111 the method provided by the embodiment of the present invention further includes: step S111.
  • step S111 refer to the description of the foregoing embodiment, and details are not described herein again.
  • the first message further includes the third indication information, where the third indication is used to indicate that the UE carries the identifier information in the second message. Therefore, the step S104 in the embodiment of the present invention may further include the following steps:
  • the UE carries the third indication information, where the third indication information is used to indicate that the UE carries the identifier information in the second message, and the UE carries the identifier information in the second message.
  • the user equipment After determining that the identifier information carried in the first message is received, the user equipment adds the identifier information to the second message.
  • the identifier information is that the UE receives the identifier information configured by the SMF entity by using the AMF entity.
  • the user equipment may actively add the identifier information to the second message, or may add the identifier information to the second message according to the trigger message (for example, the third indication information) carried in the first message.
  • the trigger message for example, the third indication information
  • step S114 can be implemented in the following manner:
  • the first message carries the third indication information, where the third indication information is used to indicate that the UE carries the identifier information in the second message, and the UE adds the identifier information to the second message according to the third indication information.
  • step S114 can be implemented in the following manner:
  • S1141b The UE acquires a session service continuity mode of the first session.
  • S1142b The UE determines that the session service continuity mode of the first session is the second mode, and the UE determines that the identifier of the first session is added as the identifier information in the second message.
  • step S114 can be implemented in the following manner:
  • the first message carries the fourth indication information, where the fourth indication information is used to indicate that the identifier of the first session is used by the UE as the identifier information, and the user equipment determines the identifier of the first session as the identifier information according to the fourth indication information. Added in the second message.
  • the second mode is the session service continuity mode SSC2.
  • the SSC2 means that the network side allows the UE to establish a second session before the first session is released.
  • the second session is the same as the data network DN of the first session.
  • step S106 in the second scenario may be implemented in the S1061a and S1062a in the foregoing embodiment, and details are not described herein again.
  • the SMF entity does not configure the identifier information as an example.
  • the difference between FIG. 7 and FIG. 6 is that the first request message carries only the first message in step S101, where the first message carries the session.
  • the release time, as well as the session release reason value, change the UPF entity.
  • the first message is used to indicate that the user equipment sends the second message within the session release time and step S111 is omitted in FIG. 7.
  • the first request message in FIG. 6 carries not only the first message but also the identifier information, and the first request message is not only used to instruct the AMF entity to send the first message to the UE, but also indicates that the AMF entity establishes the identifier information and the SMF entity.
  • the mapping relationship, and the first message carries the identification information and the session release time.
  • step S104 in the embodiment of the present invention the following steps may be further included:
  • the user equipment After receiving the session release cause value carried in the first message, the user equipment adds the identifier of the first session to the second message.
  • the identifier of the second session may also be carried in the second message.
  • the identifier information carried in the second message after the S15 is executed by the UE is the identifier of the first session.
  • step S106 can be implemented in the following manner:
  • the AMF entity sends the second message to the SMF entity associated with the identifier of the first session according to the identifier of the first session.
  • the AMF entity stores the mapping relationship between the identifier of the first session and the SMF entity, so the AMF entity can be based on The identifier of the first session sends a second message to the SMF entity associated with the identifier of the first session.
  • step S107 the method further includes:
  • the SMF entity releases the first session established between the second UPF entity and the user equipment.
  • the first message in the embodiment described in FIG. 6 and FIG. 7 further carries second indication information, where the second indication information is used to indicate that the UE second session and the first session have the same DN.
  • the user equipment and the SMF entity exist before the SMF entity triggers the user equipment to send the second message.
  • First session That is, the first session is a session between the SMF entity and the user equipment established by the second UPF entity before the SMF entity triggers the user equipment to send the second message.
  • the second message in the embodiment of the present invention may further carry the identifier information, the identifier of the first session, or the identifier of the second session that is the same as the identifier of the first session.
  • the SMF entity adopts session service continuity. Mode 2 establishes a session with the user equipment, so that the SMF entity can directly determine to select the second session between the first UPF entity establishment and the user equipment after receiving the identification information.
  • the first UPF entity in the embodiment of the present invention is selected before the SMF entity triggers the UE to send the second message.
  • the UE may determine to add the identifier of the first session as the identification information to the second message according to the indication information sent by the SMF entity received by the AMF entity.
  • the identifier of the second session is added to the second message as the identification information (such as the SS2 mode), and the identifier information configured by the SMF entity may be added to the second message (the first message at this time)
  • the UE should carry the identification information of the SMF entity configuration.
  • the UE determines to add the identifier of the first session as the identification information to the second message according to the session service continuity mode of the first session (this case is used for SS1). Mode), adding the identifier of the second session as the identification information to the second message (this case is used in the SS2 mode).
  • FIG. 8 shows a specific implementation manner of a session establishment method according to an embodiment of the present invention.
  • the mode shown in FIG. 8 is applicable to the session service continuity mode 2 described in the foregoing embodiment, that is, SMF.
  • the entity first establishes a second session, and the SMF entity releases the first session.
  • the SMF entity decides to re-select the UPF entity to establish a new session, and executes S801 and configures the identifier information.
  • the SMF entity sends a first request message to the AMF entity, where the first request message carries the first message and the identifier information, where the first message carries the session release time and the identifier information, where the first message is used to indicate that the user equipment sends the message.
  • the message requesting the establishment of the second session.
  • the first request message is used to indicate that the AMF entity establishes a mapping relationship between the identifier information and the SMF entity identifier, and sends the first message to the user equipment.
  • the AMF entity establishes a mapping relationship between the identifier information and the SMF entity identifier according to the first request message.
  • the AMF entity sends the first message to the user equipment.
  • sequence of steps S803 and S804 can be reversed in the actual process, that is, the AMF entity first performs S804 and then performs S803, or the AMF entity simultaneously executes S803 and S804, and the sequence of steps S803 and S804 is performed on the embodiment of the present invention.
  • the plan does not constitute an impact.
  • the user equipment sends a second message carrying the identifier information to the AMF entity, where the identifier information is used to indicate that the AMF entity sends the second message to the SMF entity associated with the identifier information, and the second message is used to indicate that the SMF entity establishes the identifier information according to the identifier information.
  • the AMF entity receives the second message, where the second message carries the identifier information.
  • the AMF entity sends the second message to the SMF entity associated with the identifier information according to the identifier information.
  • the SMF entity After receiving the second message, the SMF entity establishes a second session between the first UPF entity and the user equipment.
  • the SMF entity releases the first session established between the user equipment and the second UPF entity after the session release time.
  • FIG. 9 shows another implementation manner of a session establishment method according to an embodiment of the present invention.
  • FIG. 9 and FIG. 8 have the same features, and are applicable to the session service described in the foregoing embodiment.
  • Continuity mode 2 that is, the SMF entity first establishes a second session, and the SMF entity releases the first session.
  • FIG. 9 omits step S801 before S802, and the first request message carries only the second message in step S802, and the content carried in the second message in FIG. 9 is: session release time. And a session release cause value, where the session release cause value is used to indicate that the user equipment allocates an identifier different from the second session for the first session, and the first message in S805 in FIG.
  • the 9 carries at least the identifier of the first session (also The identifier of the first session may be carried, and the identifier of the first session is used to indicate that the AMF entity sends the second message to the SMF entity associated with the identifier of the first session (it is understandable that In the session service continuity mode 2, the mapping relationship between each session that the SMF entity has established and the SMF entity that establishes the session is pre-stored in the AMF entity, that is, the preset mapping relationship table is pre-stored in the AMF entity.
  • the SMF entity associated with the identifier of the first session and the identifier of the first session is stored in the table, where the SMF entity associated with the identifier of the first session is an SMF entity that establishes the first session.
  • the identifier of the second session is the identification information.
  • step S907 can be employed in FIG. 9 instead of S807 in FIG.
  • the AMF entity determines, according to the identifier of the first session, the SMF entity associated with the identifier of the second session from the preset mapping relationship table.
  • FIG. 10 shows a specific implementation manner of another session establishment method according to an embodiment of the present invention.
  • FIG. 10 is different from FIG. 9 and FIG. 8 in that the method provided in FIG. 10 is applicable to the foregoing implementation.
  • the session service continuity mode 1 first releases the first session and then establishes the second session.
  • the SMF entity determines to reselect the UPF entity, and sends a first request message to the AMF entity, where the first request message carries the first message and the first session release notification message, where the first message carries the reason for releasing the first session.
  • the value is a re-establishment session
  • the first message is used to indicate that the UE allocates the same identifier for the second session and the first session
  • the first session release notification message is used to indicate that the AMF entity establishes the identifier between the first session and the SMF entity identifier. Mapping relations.
  • the first request message is used to instruct the AMF entity to send the first session release notification message (ie, the first message) to the UE.
  • the AMF entity saves a mapping relationship between the identifier of the first session and the SMF entity identifier.
  • the AMF entity sends a first message to the user equipment.
  • S1104 The SMF entity releases the first session established between the user equipment and the second UPF entity.
  • S1105 The user equipment allocates the same identifier as the second session for the first session.
  • S1106 The user equipment sends a second message to the AMF entity, where the second message carries the identifier of the first session.
  • the identifier of the first session is used to indicate that the AMF entity sends the second message to the SMF entity associated with the identifier of the first session, and the second message is used to indicate that the SMF entity establishes a second session with the user equipment.
  • the identification information is the identifier of the first session.
  • the AMF entity determines, according to the identifier of the first session, an SMF entity associated with the identifier of the first session.
  • the AMF entity sends the second message to the SMF entity indicated by the identifier of the first session.
  • the SMF entity establishes a second session between the user equipment and the first UPF entity according to the second message.
  • the embodiment of the present invention provides a method for establishing a session, by carrying the identifier information in the second message, and then the AMF entity sends the second message to the SMF entity specified by the identifier information according to the identifier information, because the SMF entity triggers the user equipment to send The purpose of the second message is to re-establish the session.
  • the second message sent by the user equipment needs to be forwarded to the SMF entity through the AMF entity, and the AMF entity needs to perform the process of selecting the SMF entity when forwarding the second message.
  • the problem that the AMF entity needs to re-execute the process of selecting the SMF entity when the second message is received may be avoided by the identifier information, and the SMF entity selected by the AMF entity and the triggered user may be avoided.
  • the problem that the SMF entity of the second message is inconsistent is sent by the device.
  • the SMF entity does not need to perform the process of reselecting the UPF entity again after receiving the identifier information, because the SMF entity triggers the UE.
  • the second message is sent because the SMF entity is triggering the UE to send the second message.
  • the UPF entity for example, the first UPF entity
  • the UPF entity that establishes a session with the UE at this time has failed to satisfy the user's needs, and selects a suitable UPF entity (for example, the first UPF entity) to re-establish the relationship with the UE.
  • the second session which can further enable the finally established second session to preferentially materialize the user plane.
  • the embodiments of the present invention may divide the function modules of the user equipment, the AMF entity, the SMF entity, and the like according to the foregoing method examples.
  • each function module may be divided according to each function, or two or more functions may be integrated into one.
  • Processing module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of the module in the embodiment of the present invention is schematic, and is only a logical function division, and the actual implementation may have another division manner.
  • FIG. 11a shows a possible structural diagram of an AMF entity involved in the foregoing embodiment.
  • the AMF entity 10 includes a sending unit 401 and a receiving unit 402.
  • the receiving unit 402 is configured to support the AMF entity 10 to perform steps S102 and S806 in the foregoing embodiment.
  • the sending unit 401 is configured to support the AMF entity 10 to perform steps S103, S804, S807, S1104, and S1108 in the foregoing embodiment.
  • the AMF entity 10 provided by the embodiment of the present invention may further include an establishing unit 403, a saving unit 404, and a determining unit 405, where the establishing unit 403 is configured to support the AMF entity 10 to perform step S111 in the foregoing embodiment, and save Unit 404 is used to support AMF
  • the entity 10 performs the steps S108 and S1102 in the foregoing embodiment, and the establishing unit 403 is configured to support the AMF entity 10 to perform steps S111 and S1102 in the foregoing embodiment.
  • the optional AMF entity further includes a determining unit 405, configured to support the UE to perform the foregoing. Steps S1061a, S1061b, S1107, and S907 in the embodiment. All the related content of the steps involved in the foregoing method embodiments may be referred to the functional description of the corresponding functional modules, and details are not described herein again.
  • the receiving unit 402 may be a receiver of the AMF entity 10
  • the sending unit 401 may be a transmitter of the AMF entity 10, wherein the transmitter and the transceiver may be integrated to form a device as shown in FIG. 2b.
  • Transceiver Transceiver.
  • the establishing unit 403, the saving unit 404, and the determining unit 405 can be integrated on the processor of the AMF entity 10.
  • FIG. 11b shows a possible logical structure diagram of the AMF entity 10 involved in the above embodiment.
  • the AMF entity 10 includes a processing module 512 and a communication module 513.
  • the processing module 512 is configured to perform control and management on the action of the AMF entity 10.
  • the processing module 512 is configured to perform steps S102, S806, S103, S106 (S1062a, S1062b, and S1062c), S804, S807, and S1104 in the foregoing embodiment.
  • the communication module 513 is configured to support communication between the AMF entity 10 and user equipment and SMF entities.
  • the AMF entity 10 may also include a storage module 511 for storing program code and data of the AMF entity 10.
  • the processing module 512 can be a processor or a controller, for example, a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, Hardware components or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, combinations of digital signal processors and microprocessors, and the like.
  • the communication module 513 can be a transceiver, a transceiver circuit or a transceiver, and the like.
  • the storage module 511 can be a memory.
  • the processing module 512 is a processor
  • the communication module 513 is a transceiver
  • the storage module 511 is a memory
  • the AMF entity involved in the embodiment of the present invention may be the device shown in FIG. 2b.
  • FIG. 12a shows a possible structural diagram of an SMF entity involved in the foregoing embodiment, where the SMF entity 20 includes: a sending unit 601, a receiving unit 602, and an establishing unit. 603.
  • the receiving unit 602 is configured to support the SMF entity 20 to perform steps S107a, S808 in the foregoing embodiment
  • the establishing unit 603 is configured to support the SMF entity 20 to perform steps S107, S112, S116 and S809 and S1102 and S1109 in the foregoing embodiment. .
  • the SMF entity in the embodiment of the present invention further includes a sending unit 601 and a configuration unit 604, where the sending unit 601 is configured to support the SMF entity 20 to perform steps S101, S802, and S1101 in the foregoing embodiment, and the configuring unit 604 Steps S110, S113, and S801 in the above embodiment are performed to support the SMF entity 20.
  • All the related content of the steps involved in the foregoing method embodiments may be referred to the functional description of the corresponding functional modules, and details are not described herein again.
  • the sending unit 601 may be a transmitter of an SMF entity
  • the receiving unit 602 may be a receiver of an SMF entity, where the receiver and the transmitter may be integrated to form an SMF.
  • the transceiver of body 20 is shown in Figure 2c.
  • the establishing unit 603 and the configuration unit 604 can be integrated on the processor of the SMF entity 20.
  • Fig. 12b shows a possible logical structure diagram of the SMF entity 20 involved in the above embodiment.
  • the SMF entity 20 includes a processing module 712 and a communication module 713.
  • the processing module 712 is configured to perform control management on the actions of the SMF entity 20.
  • the processing module 712 is configured to support the SMF entity 20 to perform steps S107a, S808, S107, S112, S116 and S809 and S1102 and S1109, S101 in the above embodiment. , S802, S1101, S110, S113, and S801, and/or other processes for the techniques described herein.
  • the communication module 713 is configured to support the SMF entity 20 to communicate with the AMF entity.
  • the SMF entity 20 may also include a storage module 711 for storing program code and data of the SMF entity 20.
  • the processing module 712 can be a processor or a controller, for example, a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, Hardware components or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, combinations of digital signal processors and microprocessors, and the like.
  • the communication module 713 can be a transceiver, a transceiver circuit or a transceiver, or the like.
  • the storage module 711 can be a memory.
  • the SMF entity involved in the embodiment of the present invention may be the device shown in FIG. 2c.
  • FIG. 13a shows a possible structural diagram of the user equipment involved in the foregoing embodiment, where the user equipment 30 includes: an establishing unit 801, a receiving unit 802, and an allocating unit. 803 and a transmitting unit 804.
  • the establishing unit 801 is configured to instruct the UE to perform S101a in the foregoing embodiment
  • the receiving unit 802 is configured to support the user equipment 30 to perform steps S104, S1102, and S1105 in the foregoing embodiment
  • the allocating unit 803 is configured to support the user equipment 30 to perform
  • the sending unit 804 is configured to support the user equipment 30 to perform steps S104 and S1106 in the foregoing embodiment.
  • the user equipment 30 further includes an obtaining unit 805.
  • the UE is instructed to execute S1091b. All the related content of the steps involved in the foregoing method embodiments may be referred to the functional description of the corresponding functional modules, and details are not described herein again.
  • FIG. 13b is a schematic diagram showing a possible structure of the user equipment involved in the foregoing embodiment, where the user equipment 30 includes: an establishing unit 901, a receiving unit 902, and a sending. Unit 903.
  • the establishing unit 901 is configured to support the UE to perform S101a in the foregoing embodiment
  • the receiving unit 902 is configured to support the user equipment 30 to perform step S104 in the foregoing embodiment
  • the sending unit 903 is configured to support the user equipment 30 to perform the foregoing embodiment.
  • the user equipment further includes a determining unit and an obtaining unit.
  • the determining unit is configured to support the user equipment to perform S114 (S1141a, S1141b, S1142b), S115, and an acquiring unit, configured to instruct the user equipment to execute S1141b. All the related content of the steps involved in the foregoing method embodiments may be referred to the functional description of the corresponding functional modules, and details are not described herein again.
  • the sending unit 903 and the sending unit 804 may be the transmitter of the user equipment 30, and the receiving unit 902 and the allocating unit 803 may be the receiver of the user equipment 30, where the receiver and the transmitter may be integrated in the receiver.
  • the transceivers of user equipment 30 are constructed together, as shown in Figure 2d.
  • Distribution unit 803, establishment Unit 901, determining unit, and allocating unit 802 can be integrated on the processor of user device 30.
  • FIG. 13c shows a possible logical structure diagram of the user equipment 30 involved in the above embodiment.
  • the user equipment 30 includes a processing module 1012 and a communication module 1013.
  • the processing module 1012 is configured to control and control the action of the user equipment 30.
  • the processing module 1012 is configured to support the user equipment 30 to perform steps S101a, S104, S1102, and S1105, S109 (S1091a, S1092b) and S1105 in the foregoing embodiment.
  • the communication module 1013 is configured to support the user equipment 30 to communicate with the AMF entity.
  • the user equipment 30 may further include a storage module 1011 for storing program codes and data of the user equipment 30.
  • the processing module 1012 may be a processor or a controller, such as a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, Hardware components or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, combinations of digital signal processors and microprocessors, and the like.
  • the communication module 1013 may be a transceiver, a transceiver circuit or a transceiver, or the like.
  • the storage module 1011 may be a memory.
  • the processing module 1012 is a processor
  • the communication module 1013 is a transceiver
  • the storage module 1011 is a memory
  • the SMF entity involved in the embodiment of the present invention may be the device shown in FIG. 2d.
  • an embodiment of the present invention provides a computer readable storage medium, where the computer readable storage medium stores instructions, when the computer readable storage medium runs on the SMF entity, causing the SMF entity to perform step S107a in the foregoing embodiment.
  • an embodiment of the present invention provides a computer readable storage medium having instructions stored in an AMF entity to perform the steps in the foregoing embodiment when the computer readable storage medium is run on an AMF entity.
  • an embodiment of the present invention provides a computer readable storage medium, where the computer readable storage medium stores instructions, when the computer readable storage medium is run on the user equipment, causing the user equipment to perform the steps in the foregoing embodiments.
  • a computer program product includes one or more computer instructions.
  • 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 can be read from one computer readable storage medium to another computer readable storage medium Quality transfer, for example, computer instructions can be routed from a website site, computer, server or data center to another via wire (eg, coaxial cable, fiber optic, digital subscriber line DSL) or wireless (eg, infrared, wireless, microwave, etc.) A website site, computer, server, or data center transfer.
  • the computer readable storage medium can be any available media that can be read 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 (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state hard disk (SSD)) or the like.
  • a magnetic medium for example, a floppy disk, a hard disk, a magnetic tape
  • an optical medium for example, a DVD
  • a semiconductor medium for example, a solid state hard disk (SSD)
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the modules or units is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used. Combinations 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 integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • a computer readable storage medium A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a flash memory, a mobile hard disk, a read only memory, a random access memory, a magnetic disk, or an optical disk, and the like, which can store program codes.

Abstract

本发明实施例涉及通信技术领域，尤其涉及一种会话建立方法、装置及系统，用以解决现有技术中AMF实体在转发第一消息时需要重新选择SMF实体导致的效率低的问题。包括移动性管理功能AMF实体接收用户设备UE发送的第一消息，所述第一消息中携带标识信息，所述标识信息用于指示所述AMF实体将所述第一消息发送给会话管理功能SMF实体，所述第一消息用于指示所述SMF实体根据所述标识信息通过第一用户面功能UPF实体与所述UE重新建立会话；所述AMF实体根据所述标识信息，将所述第一消息发送给所述标识信息所关联的所述SMF实体。本发明实施例应用于会话建立系统中。

Description

一种会话建立方法、装置及系统 技术领域
本发明实施例涉及通信技术领域，尤其涉及一种会话建立方法、装置及系统。
背景技术
在第五代移动通信技术(5-Generation，5G)中，用户设备(User Equipment，UE)和数据网络(Date Network，DN)之间存在一个用于提供协议数据单元(Protocol Data Unit，PDU)连通服务的PDU会话(session)。通常PDU会话采用的会话服务连续性模式为：会话服务连续性模式(Session and Service Continuity mode，SSC mode)1和SSC mode2。
如图1a所示，图1a示出了SSC mode 1的会话建立流程，即网络侧(例如，会话功能管理(Session Management Function，SMF)实体)释放PDU session并指示UE立即建立相同DN的新的PDU session，然后SMF实体在接收到UE发送的第一消息时，SMF实体选择新的用户面功能(User Plan Function，UPF)实体，以实现PDU session的建立。也即通过SSC mode 1建立会话时由于一个UPF实体对应一个IP地址，这样不仅UPF实体可以改变，IP地址也会改变。如图1b所示，图1b示出了SSC mode2的会话建立流程，SMF实体指示UE在预设时间内建立新的PDU session，然后SMF实体在接收到UE发送的第一消息时，选择新的SMF实体并建立新的PDU session，最后在预设时间后SMF释放旧的PDU session。
但是，现有技术中，由于UE发送的第一消息是通过移动性管理功能(Authentication and Mobility Management Function，AMF)实体发送给SMF实体的，AMF实体在转发第一消息时会重新执行一遍SMF实体选择过程，且新选择的SMF实体依旧会执行一次选择UPF实体的过程，这样会导致处理效率较低。且若AMF实体所选择的SMF实体和触发重新建立PDU session的SMF实体不是同一个SMF实体，则会导致新选择的SMF实体选择的UPF和触发重新建立PDU session的SMF实体选择的UPF实体不一致，从而无法保证重建PDU session后能够优实体化用户面。
发明内容
本申请提供一种会话建立方法、装置及系统，用以解决现有技术中AMF实体在转发第一消息时需要重新选择SMF实体导致的效率低的问题。
为达到上述目的，本申请采用如下技术方案：
第一方面，本发明实施例提供一种会话建立方法，包括：用户设备UE通过会话管理功能SMF实体建立第一会话；UE接收移动性管理功能AMF实体发送的第一消息，第一消息用于指示UE发送用于第二会话的请求；UE为第二会话分配与第一会话相同的标识；UE向AMF实体发送用于UE请求建立第二会话的第二消息，第二消息中携带第二会话的标识，第二会话的标识用于指示AMF实体将第二消息发送SMF 实体。
本发明实施例提供一种会话建立方法，通过在第二消息中携带标识信息，然后AMF实体根据该标识信息将第二消息发送给标识信息指定的SMF实体，这是由于SMF实体触发用户设备发送第二消息的目的在于重新建立会话，而在会话建立系统中，用户设备发送的第二消息需要通过AMF实体才能转发给SMF实体，AMF实体在转发第二消息时需要执行选择SMF实体的过程，因此，本发明实施例中通过标识信息可以避免AMF实体在接收到第二消息时需要重新执行选择SMF实体的过程导致的处理效率低的问题，且可以避免AMF实体所选择的SMF实体与触发用户设备发送第二消息的SMF实体不一致的问题，进一步的本发明实施例中通过标识信息可以使得SMF实体在接收到标识信息后不需要再次执行重选UPF实体的过程，这是由于SMF实体触发UE发送第二消息往往是因为SMF实体在触发UE发送第二消息之前已确定此时与UE建立会话的UPF实体(例如，第一UPF实体)已经不能满足用户需要，并选择了合适的UPF实体(例如，第一UPF实体)重新建立与UE之间的第二会话，这样可以进一步使得最终所建立的第二会话能够优实体化用户面。
结合第一方面，在第一方面的第一种可能的实现方式中，第一消息中携带用于指示UE为第二会话分配与第一会话相同的标识的第一指示信息，UE为第二会话分配与所述第一会话相同的标识，包括：UE根据第一指示信息，为第二会话分配与第一会话相同的标识。
结合第一方面或第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，UE为第二会话分配与第一会话相同的标识，包括：UE获取第一会话的会话服务连续性模式；UE确定第一会话的会话服务连续性模式为第一模式，则为第二会话分配与第一会话相同的标识。
结合第一方面至第一方面的第二种可能的实现方式中任意一项，在第一方面的第三种可能的实现方式中，第一消息中携带标识信息，标识信息用于AMF实体将第二消息发送给标识信息SMF实体；第二消息中携带标识信息。具体的，在AMF实体中保存有标识信息与SMF实体标识的对应关系。
结合第一方面至第一方面的第三种可能的实现方式中任意一项，在第一方面的第四种可能的实现方式中，第一消息中携带用于指示第二会话的数据网络DN与第一会话的DN相同的第二指示信息。
第二方面，本发明实施例提供一种会话建立方法，包括：用户设备UE通过会话管理功能SMF实体建立第一会话；UE接收移动性管理功能AMF实体发送的用于指示UE发送用于建立第二会话的请求的第一消息；UE向AMF实体发送第二消息，第二消息用于请求建立第二会话，第一消息中携带用于指示AMF实体将第二消息发送给标识信息所关联的SMF实体的标识信息。
结合第二方面，在第二方面的第一种可能的实现方式中，第一消息中携带用于指示UE在第二消息中携带标识信息的于指示UE在第二消息中携带标识信息的第三指示信息，具体的，UE在接收到第三指示信息后，在第二消息中携带标识信息。
结合第二方面或第二方面的第一种可能的实现方式，在第二方面的第二种可能 的实现方式中，获取第一会话的会话服务连续性模式，UE确定第一会话的会话服务连续性模式为第二模式，则UE将第一会话的标识确定为标识信息。第二模式为会话服务连续性模式SSC2，SSC2是指网络侧允许UE在第一会话释放之前先建立第二会话，第二会话与第一会话的数据网络DN相同。在SSC2中第一会话与第一会话存在并存的时间段。
结合第二方面至第二方面的第二种可能的实现方式中任意一项，在第二方面的第三种可能的实现方式中，UE通过AMF实体接收SMF实体配置的标识信息。
结合第二方面至第二方面的第三种可能的实现方式中任意一项，在第二方面的第四种可能的实现方式中，第一消息中携带第四指示信息，第四指示信息用于指示UE将第一会话的标识作为标识信息，用户设备根据第四指示信息将第一会话的标识确定为标识信息，即UE请求建立第二会话的第二消息中至少携带第一会话的标识，例如，第二消息中既携带第二会话的标识，也携带第一会话的标识。
结合第二方面至第二方面的第四种可能的实现方式中任意一项，在第二方面的第五种可能的实现方式中，第一消息中携带用于指示UE建立与第一会话的数据网络DN相同的第二会话的第二指示信息。
第三方面，本发明实施例提供一种会话建立方法，包括：移动性管理功能AMF实体向用户设备UE发送用于指示UE发送用于建立第二会话的请求的第一消息，移动性管理功能AMF实体接收用户设备发送携带标识信息的第二消息，该标识信息用于指示AMF实体将第二消息发送给标识信息所关联的会话管理功能SMF实体，第二消息用于请求建立第二会话；AMF实体根据标识信息，将第二消息发送给SMF实体。
结合第三方面，在第三方面的第一种可能的实现方式中，第一消息中携带用于指示UE在第二消息中携带标识信息的第三指示信息。
结合第三方面或第三方面的第一种可能的实现方式，在第三方面的第二种可能的实现方式中，标识信息为SMF实体配置的，AMF实体向UE发送第一消息之前，本发明实施例提供的方法还包括：AMF实体接收SMF实体发送的用于指示AMF实体建立标识信息与SMF实体标识之间的映射关系的第一请求消息；AMF实体根据标识信息，将第二消息发送给标识信息所关联的SMF实体标识，包括：AMF实体根据标识信息，获取与标识信息存在对应关系的SMF实体标识；AMF实体将第二消息发送给与标识信息存在对应关系的SMF实体标识所指示的SMF实体。
结合第三方面至第三方面的第二种可能的实现方式中任意一项，在第三方面的第三种可能的实现方式中，移动性管理功能AMF实体向用户设备UE发送第一消息之前，本发明实施例提供的方法还包括：AMF实体接收SMF实体发送的用于指示AMF实体保存第一会话的标识与SMF实体之间的映射关系的第一请求消息，第一会话为SMF实体发送第一请求消息之前，SMF实体与UE之间建立的会话；AMF实体根据第一请求消息，保存第一会话的标识与SMF实体之间的映射关系。
结合第三方面至第三方面的第三种可能的实现方式中任意一项，在第三方面的第四种可能的实现方式中，第一消息中还携带用于指示UE为第二会话分配与第一会 话相同的标识的第一指示信息，则标识信息为第二会话的标识。
结合第三方面至第三方面的第四种可能的实现方式中任意一项，在第三方面的第五种可能的实现方式中，第一消息中携带用于指示UE将第一会话的标识作为标识信息的第四指示信息。
结合第三方面至第三方面的第五种可能的实现方式中任意一项，在第三方面的第六种可能的实现方式中，第一消息中携带用于指示UE建立与第一会话的数据网络DN相同的第二会话的第二指示信息。
第四方面，本发明实施例提供一种会话建立方法，包括：会话管理功能SMF实体向移动性管理功能AMF实体发送用于指示AMF实体将第一消息发送给用户设备UE的第一请求消息，第一消息用于指示UE发送用于建立第二会话的第二消息；会话管理功能SMF实体接收移动性管理功能AMF实体发送的用于指示建立第二会话的第二消息，SMF实体根据第二消息建立与用户设备UE之间的第二会话。
结合第四方面，在第四方面的第一种可能的实现方式中，第一消息中携带用于指示UE在第二消息中携带标识信息的第三指示信息。
结合第四方面或第四方面的第一种可能的实现方式，在第四方面的第二种可能的实现方式中，会话管理功能SMF实体向AMF实体发送第一请求消息之前，本发明实施例提供的方法还包括：SMF实体配置用于指示AMF实体将第二消息发送给SMF实体的标识信息；第一请求消息还用于指示AMF实体建立标识信息与SMF实体标识之间的映射关系。
结合第四方面至第四方面的第二种可能的实现方式中任意一项，在第四方面的第三种可能的实现方式中，第一请求消息还用于指示AMF实体建立第一会话的标识和SMF实体之间的关系，第二消息中还携带用于指示UE为第一会话和第二会话分配相同的会话标识的第三指示信息，标识信息为第二会话的标识，第一会话为SMF实体发送第一请求消息之前SMF实体与UE之间建立的会话。
结合第四方面至第四方面的第三种可能的实现方式中任意一项，在第四方面的第四种可能的实现方式中，第一消息中携带用于指示UE将第一会话的标识作为标识信息的第四指示信息，标识信息为第一会话的标识。
结合第四方面至第四方面的第四种可能的实现方式中任意一项，在第四方面的第五种可能的实现方式中，第一消息中还携带用于指示UE建立与所述第一会话的数据网络DN相同的第二会话的第二指示信息。
第五方面，本发明实施例提供一种用户设备，包括：建立单元，用于通过会话管理功能SMF实体建立第一会话；接收单元，用于接收移动性管理功能AMF实体发送的用于指示用户设备UE发送用于建立第二会话的请求的第一消息；分配单元，用于为第二会话分配与第一会话相同的标识；发送单元，用于向AMF实体发送用于指示UE请求建立第二会话的第二消息，第二消息中携带用于指示AMF实体将第二消息发送SMF实体的第二会话的标识。
结合第五方面，在第五方面的第一种可能的实现方式中，第一消息中携带用于指示UE为第二会话分配与第一会话相同的标识的第一指示信息，分配单元，具体用 于根据第一指示信息，为第二会话分配与第一会话相同的标识。
结合第五方面或第五方面的第一种可能的实现方式，在第五方面的第二种可能的实现方式中，用户设备还包括：获取单元，用于获取第一会话的会话服务连续性模式；分配单元，具体用于确定第一会话的会话服务连续性模式为第一模式，则为第二会话分配与第一会话相同的标识作为标识信息。
第六方面，本发明实施例提供一种用户设备，包括：建立单元，通过会话管理功能SMF实体建立第一会话；接收单元，用于接收移动性管理功能AMF实体发送的用于指示用户设备UE发送用于建立第二会话的请求的第一消息；发送单元，用于向AMF实体发送用于指示建立第二会话的第二消息，第一消息中携带用于指示AMF实体将第二消息发送给标识信息所关联的SMF实体的标识信息。
结合第六方面，在第六方面的第一种可能的实现方式中，用户设备还包括：获取单元，用于获取第一会话的会话服务连续性模式；确定单元，用于确定第一会话的会话服务连续性模式为第二模式，则将第一会话的标识确定为标识信息。
结合第六方面或第六方面的第一种可能的实现方式，在第六方面的第二种可能的实现方式中，用户设备还包括：确定单元用于在确定第一消息中携带用于指示UE将第一会话的标识作为标识信息的第四指示信息，则将第一会话的标识确定为标识信息携带在第二消息中，第四指示信息用于指示UE将所述第一会话的标识作为所述标识信息。
结合第六方面至第六方面的第二种可能的实现方式，在第六方面的第三种可能的实现方式中，接收单元，还用于通过AMF实体接收SMF实体配置的标识信息。
结合第六方面至第六方面的第三种可能的实现方式中任意一项，在第六方面的第四种可能的实现方式中，第一消息中携带用于指示UE建立与第一会话的数据网络DN相同的第二会话的第二指示信息。
第七方面，本发明实施例提供一种移动性管理功能AMF实体，包括：发送单元，用于向用户设备UE发送用于指示UE发送用于建立第二会话的请求的第一消息；接收单元，用于接收用户设备发送的携带标识信息的第二消息，标识信息用于指示AMF实体将第二消息发送给标识信息所关联的会话管理功能SMF实体，第二消息用于指示建立第二会话；发送单元，用于根据标识信息，将第二消息发送给标识信息所关联的SMF实体。
结合第七方面，在第七方面的第一种可能的实现方式中，第一消息中携带用于指示所述UE在第二消息中携带标识信息的第三指示信息。
结合第七方面或第七方面的第一种可能的实现方式，在第七方面的第二种可能的实现方式中，标识信息为SMF实体配置的，接收单元，还用于接收SMF实体发送的用于指示AMF实体建立标识信息与SMF实体标识之间的映射关系的第一请求消息；AMF实体还包括：建立单元，用于根据第一请求消息建立标识信息与SMF实体标识之间的映射关系；AMF实体还包括：获取单元，用于根据标识信息，获取与标识信息存在对应关系的SMF实体标识；发送单元具体用于：将第二消息发送给SMF实体标识所关联的SMF实体。
结合第七方面至第七方面的第二种可能的实现方式中任意一项，在第七方面的第三种可能的实现方式中，接收单元，还用于接收SMF实体发送的用于指示AMF实体保存第一会话的标识与SMF实体标识之间的映射关系的第一请求消息，第一会话为SMF实体发送第一请求消息之前SMF实体与UE之间建立的会话；AMF实体还包括：保存单元，用于根据第一请求消息，保存第一会话的标识与SMF实体之间的映射关系。
第八方面，本发明实施例提供一种会话管理功能SMF实体，包括：发送单元，用于向移动性管理功能AMF实体发送用于指示AMF实体将第一消息发送给用户设备UE的第一请求消息，第一消息用于指示UE发送用于建立第二会话的第二消息；接收单元，用于接收移动性管理功能AMF实体发送的用于指示建立第二会话的第二消息；建立单元，用于根据第二消息建立与用户设备UE之间的第二会话。
结合第八方面，在第八方面的第一种可能的实现方式中，第一消息中携带用于指示UE在第二消息中携带标识信息的第三指示信息。
结合第八方面或第八方面的第一种可能的实现方式，在第八方面的第二种可能的实现方式中，SMF实体还包括：配置单元，用于配置用于指示AMF实体将第二消息发送给SMF实体的标识信息；第一请求消息还用于指示AMF实体建立标识信息与SMF实体之间的映射关系。
第九方面，本发明实施例提供一种移动性管理功能AMF实体，包括存储器、处理器、总线和收发器，存储器中存储代码和数据，处理器与存储器通过总线连接，处理器运行存储器中的代码使得AMF实体执行第三方面至第三方面的第六种可能的实现方式中任意一项所描述的会话建立方法。
第十方面，本发明实施例提供一种会话管理功能SMF实体，包括存储器、处理器、总线和收发器，存储器中存储代码和数据，处理器与存储器通过总线连接，处理器运行存储器中的代码使得所述SMF实体执行第四方面至第四方面的第五种可能的实现方式中任意一项所描述的会话建立方法。
第十一方面，本发明实施例一种用户设备，包括存储器、处理器、总线和收发器，存储器中存储代码和数据，处理器与存储器通过总线连接，处理器运行存储器中的代码使得所述用户设备执行第一方面至第一方面的第四种可能的实现方式所描述的会话建立方法或者第二方面至第二方面的第四种可能的实现方式所描述的会话建立方法。
第十二方面，本发明实施例提供一种计算机可读存储介质，包括指令，当其在AMF实体上运行时，使得AMF实体执行第三方面至第三方面的第六种可能的实现方式中任意一项所描述的会话建立方法，或者当其在SMF实体上执行时，使得SMF实体执行第四方面至第四方面的第五种可能的实现方式中任意一项所描述的会话建立方法，或者当其在用户设备上运行时，使得用户设备执行第一方面至第一方面的第四种可能的实现方式所描述的会话建立方法或者第二方面至第二方面的第四种可能的实现方式所描述的会话建立方法。
第十三方面，本发明实施例提供一种会话建立系统，包括第七方面至第七方面 的第三种可能的实现方式所描述的AMF实体，第八方面至第八方面的第二种可能的实现方式中任意一项所描述的SMF实体，以及第五方面至第五方面的第二种可能的实现方式中任意一项所描述的用户设备，或者第六方面至第六方面的第四种可能的实现方式中任意一项所描述的用户设备。
附图说明
图1a为现有技术中提供的一种会话建立方法的流程示意图一；
图1b为现有技术中提供的一种会话建立方法的流程示意图二；
图2a为本发明实施例提供的一种会话建立方法所应用的系统架构图；
图2b为本发明实施例提供的一种AMF实体的结构示意图；
图2c为本发明实施例提供的一种SMF实体的结构示意图；
图2d为本发明实施例提供的一种UE的结构示意图；
图3为本发明实施例提供的一种会话建立方法的流程示意图一；
图4为本发明实施例提供的一种会话建立方法的流程示意图二；
图5为本发明实施例提供的一种会话建立方法的流程示意图三；
图6为本发明实施例提供的一种会话建立方法的流程示意图四；
图7为本发明实施例提供的一种会话建立方法的流程示意图五；
图8为本发明实施例提供的一种会话建立方法的具体使用流程示意图；
图9为本发明实施例提供的又一种会话建立方法的具体使用流程示意图；
图10为本发明实施例提供的另一种会话建立方法的具体使用流程示意图；
图11a为本发明实施例提供的一种AMF实体的结构示意图一；
图11b为本发明实施例提供的一种AMF实体的结构示意图二；
图12a为本发明实施例提供的一种SMF实体的结构示意图一；
图12b为本发明实施例提供的一种SMF实体的结构示意图二；
图13a为本发明实施例提供的一种用户设备的结构示意图一；
图13b为本发明实施例提供的一种用户设备的结构示意图二；
图13c为本发明实施例提供的一种用户设备的结构示意图三。
具体实施方式
为了便于清楚描述本发明实施例的技术方案，在本发明的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分，本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定。
需要说明的是，本发明实施例中的会话服务连续性模式1是指SMF实体在确定需要重新选择UPF实体建立新会话时，SMF实体先释放用户设备与第一UPF实体之间建立的第一会话，如图1a所示，然后SMF实体立即通过AMF实体向用户设备发送用于指示重新建立会话的请求消息(例如，图1a中所示的第一消息)。最后再根据用户设备发送的会话建立连接请求(例如，下述实施例中的第二消息)建立用户设备和第二UPF实体之间的第二会话，最终通过为第二会话服务的第二UPF实体发送数据。也即第一会话在第二会话建立之前已经由SMF实体释放。
会话服务连续性模式2是指SMF实体在确定需要重新选择UPF实体建立新会话时，SMF实体先通过AMF实体向用户设备发送第一消息，该第一消息用于指示用户设备在预设时间内发送会话建立连接请求(例如，第二消息)以使得SMF实体通过第二UPF实体建立第二UPF实体与用户设备之间的第二会话，SMF实体并在预设时间后，释放第一会话，也即第一UPF实体与用户设备之间建立的第一会话。即第一会话在第二会话建立后的预设时间之后由SMF实体释放。
需要说明的是，本发明实施例中的第一模式为上述会话服务连续性模式1，即SSC1，第二会话服务连续性模式为上述会话服务连续性模式2，即SSC2。
其中，SSC1是指可能由网络侧触发释放第一会话并通知UE立即建立第二会话，并且第二会话与第一会话的数据网络DN相同。在SSC1下，第一会话先被释放，之后第二会话被建立。
其中，SSC2是指可能由网络侧触发UE建立第二会话，并且第二会话与第一会话的数据网络DN相同。在SSC2下，第二会话先被建立，之后第一会话被释放。
但是，现有技术中SMF实体不论是采样会话服务连续性模式1还是会话服务连续性模式2建立用户设备和UPF实体之间的会话，而会话建立连接请求需要通过AMF实体转发给SMF实体，因此会存在AMF实体选择SMF实体的问题，这样不仅会导致处理效率低，且还会存在新选择的SMF实体与触发重建会话的SMF实体不一致时，所导致的新选择的SMF实体重新选择UPF实体的问题。例如，第一SMF实体触发用户设备发送会话建立连接请求(第一SMF实体触发用户设备发送会话建立连接请求之前已经选择通过第二UPF实体为用户设备服务，第二UPF实体为第一SMF实体根据用户设备的位置，所发送的数据特征以及第二UPF实体的位置为用户设备选择的能够提高用户功能面的UPF实体)，该会话建立连接请求通过AMF实体转发给SMF实体，这样有可能存在AMF实体将会话建立连接请求发送给第二SMF实体，这样会存在第二SMF实体在接收到会话建立连接请求后重新选择UPF实体，第二SMF实体重新选择的UPF实体可能为第三UPF实体，也可能为第一UPF实体，这样与第一SMF实体希望为用户设备提供服务的UPF实体不一致。
综上所述，本发明实施例通过在会话建立连接请求(即第二消息)中携带标识信息，可以使得AMF实体在接收到用户设备发送的会话建立连接请求后根据标识信息将其转发给触发用户设备发送会话建立连接请求的SMF实体，从而避免了AMF实体重新选择SMF实体以及SMF实体重新选择UPF实体导致的效率低的问题。
如图2a所示，图2a示出了本发明实施例提供的一种会话建立方法所应用的系统架构图，包括移动性管理功能AMF实体10、一个或多个会话管理功能SMF实体20、一个或多个用户设备UE30、数据网络(Data Network，DN)40、一个或多个用户面功能实体50、接入站点((Radio)Acess Node，(无线)接入站点)60、分组控制功能(Packet Control Function，PCF)实体70、应用功能(application function，AF)实体80、标准的数据管理(Unified Data Management，UDM)实体90，用于存储用户签约信息，以及鉴定服务功能(Authentication Server Function，AUSF)实体00。
其中，移动性管理功能AMF实体10用于根据UE30发送的会话连接建立请求选 择SMF实体，以使得所选择的SMF实体建立UE30和UPF实体50之间的会话。其中，AMF实体10还用于将SMF实体发送的第一消息转发给用户设备，其中，第一消息用于指示用户设备发送请求建立第二会话的第二消息(例如，会话连接建立请求消息)，该第二消息用于指示建立第二会话，这样SMF实体在接收到第二消息后，可以根据第二消息建立UE30和UPF实体之间的第二会话。
可选的，AMF实体10中存储有会话的标识和建立会话的SMF实体之间的映射关系，以及用于根据SMF实体配置的标识信息建立标识信息与SMF实体之间的映射关系。
其中，SMF实体20用于根据UE30的位置信息或者UE30发送的数据的特征或者UPF50与UE30之间的位置，UPF的服务质量为UE重新分配UPF，以重新建立UE和新分配的UPF之间的会话，从而提高重建后的会话能够优化用户面。SMF实体20还用于配置标识信息，该标识信息用于指示AMF实体将第二消息发送给SMF实体。会话管理功能实体20还用于建立UE30和UPF实体50之间的Session会话，例如，协议数据单元(Protocol Data Unit，PDU)会话，该PDU Session用于将UE30与DN40连接，该PDU Session用于提供PDU数据包。
多个用户设备UE30，用于根据建立的会话与DN通信。
数据网络DN40，用于提供数据服务的外部网络。
接入站点60用于为UE30提供数据服务，例如，接收UE30发送的数据，或者向UE30发送数据，在实际使用过程中接入站点60可以为基站。其中，在本发明实施例中，基站(base station，BS)可以是与用户设备(User Equipment，UE)或其它通信站点如中继站点，进行通信的设备，基站可以提供特定物理区域的通信覆盖。
PCF实体70，用于作为射频部分与分组网络(IP网络)间的接口。
AF实体80，用于起到应用影响路由的作用。
示例性的，如图2a所示，AMF实体10和SMF实体20之间通过接口N11通信。AMF实体10和UE30之间通过接口N1通信，AMF实体10和接入站点60之间通过接口N2通信，AMF实体10与AUSF实体00之间通过接口N12通信，AMF实体10与UDM实体之间通过接口N8通信，AMF实体10与PCF实体之间通过接口N15通信，SMF实体20与UDM实体90之间通过接口N10通信，SMF实体20与UPF实体50之间通过接口N4通信，UPF实体50与数据网络40之间通过接口N6通信，PCF实体与AF实体之间通过接口N5通信。
图2b提出了本发明实施例提供的一种AMF实体的结构示意图，如图2b可知，AMF实体10包括：处理器101、收发器102、存储器104以及总线103。其中，收发器102、处理器101以及存储器104通过总线103相互连接；总线103可以是PCI总线或EISA总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图2b中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。其中，存储器104用于存储AMF实体10的程序代码和数据。收发器102用于支持AMF实体10与其他设备通信，处理器101用于支持AMF实体10执行存储器104中存储的程序代码和数据以实现本发明实施例提供的一种会话建立方法。
图2c提出了本发明实施例提供的一种SMF实体的结构示意图，如图2c可知，SMF实体20包括：处理器201、收发器202、存储器204以及总线203。其中，收发器202、处理器201以及存储器204通过总线203相互连接；总线203可以是PCI总线或EISA总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图2c中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。其中，存储器204用于存储SMF实体20的程序代码和数据。收发器202用于支持SMF实体20与其他设备通信，处理器201用于支持SMF实体20执行存储器204中存储的程序代码和数据以实现本发明实施例提供的一种会话建立方法。
图2d提出了本发明实施例提供的一种用户设备的结构示意图，如图2d可知，用户设备30包括：处理器301、收发器302、存储器304以及总线303。其中，收发器302、处理器301以及存储器304通过总线303相互连接；总线303可以是PCI总线或EISA总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图2d中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。其中，存储器304用于存储用户设备30的程序代码和数据。收发器302用于支持用户设备30与其他设备通信，处理器301用于支持用户设备30执行存储器304中存储的程序代码和数据以实现本发明实施例提供的一种会话建立方法。
在本发明实施例中，UE可以分布于整个无线网络中，每个UE可以是静态的或移动的。
UE可以是为终端(terminal)，移动台(mobile station)，用户单元(subscriber unit)，站台(station)等。UE可以为蜂窝电话(cellular phone)，个人数字助理(personal digital assistant，PDA)，无线调制解调器(Modem)，无线通信设备，手持设备(handheld)，膝上型电脑(laptop computer)，无绳电话(cordless phone)，无线本地环路(wireless local loop，WLL)台等。当UE应用于M2M方式通信时，UE可以称为M2M终端，具体可以是支持M2M通信的智能电表、智能家电等。
如图3所示，本发明实施例提供的会话建立方法，包括：
S101a、用户设备通过会话管理功能SMF实体建立第一会话。
S101、会话管理功能SMF实体向移动性管理功能AMF实体发送第一请求消息，第一请求消息用于指示AMF实体将第一消息发送给用户设备UE，该第一消息用于指示UE发送用于建立第二会话的请求。
本发明实施例中的第一消息可以为会话释放通知消息，该会话释放通知消息用于指示UE发送第二消息，即会话连接建立请求消息。
可以理解的是，当SMF实体采用不同的会话服务连续性模式与用户设备之间建立会话时，第一消息携带的内容也会存在差异，例如，若SMF实体采用会话服务连续性模式1与用户设备之间建立会话，则第一消息中携带会话原因值，其中会话原因值可以为重新建立第二会话，若SMF实体采用会话服务连续性模式2与用户设备之间建立会话，则该第一消息中携带会话释放时间以及SMF实体配置的标识信息，或者该第一消息中携带会话释放时间以及会话释放原因值，该会话释放原因值为更换UPF实体。
S102、AMF实体接收第一请求消息。
S103、AMF实体向UE发送第一消息，第一消息用于指示UE发送用于建立第二会话的请求。
S104、UE向AMF实体发送第二消息，其中，第二消息中携带标识信息，该标识信息用于指示AMF实体将第二消息发送给SMF实体，第二消息用于指示重新建立第二会话。
S105、AMF实体接收第二消息。
S106、AMF实体根据标识信息，将第二消息发送给标识信息所关联的SMF实体。
S107a、SMF实体接收AMF实体发送的第二消息。
S107、SMF实体根据第二消息通过第一用户面功能UPF实体重新建立与UE之间的第二会话。
本发明实施例提供一种会话建立方法，通过在第二消息中携带标识信息，然后AMF实体根据该标识信息将第二消息发送给标识信息指定的SMF实体，这是由于SMF实体触发用户设备发送第二消息的目的在于重新建立会话，而在会话建立系统中，用户设备发送的第二消息需要通过AMF实体才能转发给SMF实体，AMF实体在转发第二消息时需要执行选择SMF实体的过程，因此，本发明实施例中通过标识信息可以避免AMF实体在接收到第二消息时需要重新执行选择SMF实体的过程导致的处理效率低的问题，且可以避免AMF实体所选择的SMF实体与触发用户设备发送第二消息的SMF实体不一致的问题，进一步的本发明实施例中通过标识信息可以使得SMF实体在接收到标识信息后不需要再次执行重选UPF实体的过程，这是由于SMF实体触发UE发送第二消息往往是因为SMF实体在触发UE发送第二消息之前已确定此时与UE建立会话的UPF实体(例如，第一UPF实体)已经不能满足用户需要，并选择了合适的UPF实体(例如，第一UPF实体)重新建立与UE之间的第二会话，这样可以进一步使得最终所建立的第二会话能够优实体化用户面。
可以理解的是，本发明实施例所应用的场景为：UE和SMF已经建立了第一会话。只是，在数据交互过程中SMF实体确定用于为第一会话提供服务的UPF实体不能满足需求，并为UE选择合适的第一UPF实体，用于建立第二会话。
由于UE和UPF实体之间形成的会话服务连续性模式可以为上述会话服务连续性模式1和会话服务连续性模式2，但是不同的会话服务连续性模式使得SMF实体和UE在通信时所发送的信息的内容不同，且SMF实体释放第一会话的时机也不同，例如，会话服务连续性模式1中SMF实体在第二会话建立之前已经将第一会话释放，会话服务连续性模式2中SMF实体在第二会话建立之后且达到会话释放时间时才将第一会话释放。
因此，以下将分别介绍会话服务连续性模式1和会话服务连续性模式2下的会话建立方法。
首先，以第一场景为会话服务连续性模式1为例介绍。
如图4所示，本发明实施例中第一请求消息还用于指示AMF实体建立SMF实体标识与第一会话的标识之间的映射关系，具体的，第一请求消息中携带第一 消息以及通知消息，其中，第一消息中携带会话原因值，其中会话原因值为重新建立第二会话，通知消息用于指示AMF实体重新建立会话的原因是更换UPF实体，则本发明实施例在步骤S103之前，还包括：
S108、AMF实体根据通知消息保存第一会话的标识和SMF实体的映射关系。
其中，第一会话的标识用于唯一识别第一会话，本发明实施例中第一会话的标识可以根据需要设置，第一会话的标识和SMF实体的映射关系可以以表格的形式存储在AMF实体的存储设备中。
相应的，在步骤S104之前，本发明实施例还可以包括：
S109、用户设备为第二会话分配与第一会话相同的标识，将第二会话的标识作为标识信息添加到第二消息中。
其中，第二会话的标识用于唯一识别第二会话。
可以理解的是，在用户设备执行完S109后，用户设备将第二会话的标识确定为标识信息添加在第二消息中，该第二会话的标识用于指示AMF实体将第二消息发送给SMF实体，该SMF实体为第二标识所关联的SMF实体。
由于用户设备可以根据第一消息中携带的第一指示信息确定为第二会话分配与第一会话相同的标识，也可以自己决定为第二会话分配与第一会话相同的标识。因此，一方面，本发明实施例中的步骤S109可以通过以下方式实现：
S1091a、UE根据第一指示信息，为第二会话分配与第一会话相同的标识。
其中，第一指示信息通过第一消息发送给用户设备，第一指示信息用于指示UE为第二会话分配与第一会话相同的标识。
另一方面，本发明实施例中的步骤S109还可以通过以下方式实现：
S1091b、用户设备获取第一会话的会话服务连续性模式。
可以理解的是，用户设备可以通过与其他设备交互以获取第一会话的会话服务连续性模式。
UE获取第一会话的会话服务连续性模式，具体可以是在UE在建立第一会话时通过SMF实体配置给的，也有可能是在第一会话建立后通过SMF实体更新给UE的。具体的实现方式包括：
UE可以配置有SSC模式选择策略，所述SSC模式选择策略用于确定一个应用或者一组应用与SSC模式的关联关系。当有应用请求数据传输时，UE根据SSC模式选择策略确定要建立会话的SSC模式，UE在会话建立请求消息中携带请求的SSC模式，SMF实体或者接受UE请求的SSC模式，或者基于签约以及运营商策略等修改请求的SSC模式，最后SMF实体确定会话的SSC模式后通知UE选择的或者接受的SSC模式。
UE也可以在会话建立请求消息中不携带SSC模式，由SMF基于UE签约以及运营商策略等直接确定会话的SSC模式，最后由SMF实体通知UE选择的或者接受的SSC模式。
S1092b、用户设备确定第一会话的会话服务连续性模式为第一模式，则为第二会话分配与第一会话相同的标识。
可选的，本发明实施例中的第二消息中还携带有标识信息，该标识信息用于指示AMF实体将第二消息发送给标识信息所关联的SMF实体。
此时，结合图3，如图5所示，本发明实施例在步骤S101之前，还包括：
S110、SMF实体配置标识信息。
其中，SMF实体配置的标识信息通过AMF实体以第一消息的形式转发给用户设备，第一消息中还携带标识信息，该第一消息还用于指示用户设备在第二消息中添加标识信息。
可选的，第一请求消息中还携带标识信息，第一请求消息还用于指示AMF实体建立标识信息与SMF实体标识之间的映射关系，因此在步骤S106之前，本发明实施例提供的方法还包括：
可选的，标识信息为用于唯一识别SMF实体标识的指示信息，可以为编号也可以为其他信息，本发明实施例对此不限定，SMF实体标识用于唯一识别SMF实体，可以为SMF实体的MAC地址，也可以为SMF实体的产品编号，例如，以标识信息为101，SMF实体标识为第一标识为例，则AMF实体可以在其存储装置中建立如下映射关系，如表1所示。
表1映射关系表
标识信息 SMF实体标识
101 第一标识
S111、AMF实体根据第一请求消息，建立标识信息与SMF实体标识之间的映射关系。
由于第二消息中可能携带标识信息，也可能携带第二会话的标识，因此，步骤S106的实现方式存在差异，以下将结合第二消息的内容具体介绍：
一方面，第二消息中携带标识信息，则步骤S106可以通过以下方式实现：
S1061a、AMF实体根据标识信息，确定与标识信息存在映射关系的SMF实体。
可选的，AMF实体可以根据标识信息，从预先建立的标识信息与SMF实体之间的映射关系中确定与标识信息存在映射关系的SMF实体。
S1062a、AMF实体将第二消息发送给与标识信息存在映射关系的SMF实体。
另一方面，第二消息中携带第二会话的标识，则步骤S106可以通过以下方式实现：
S1061b、AMF实体根据第二会话的标识，确定与第二会话的标识所关联的SMF实体。
可选的，AMF实体根据第二会话的标识从步骤S108中建立的第一会话的标识与SMF实体之间的映射关系中确定第二会话的标识所关联的SMF实体。这是由于，第二会话的标识和第一会话的标识相同，因此，可以通过第二会话的标识，确定第二会话的标识所关联的SMF实体。
S1062b、AMF实体将第二消息发送给与第二会话的标识所关联的SMF实体。
综上所述，在会话服务连续性模式1场景下，第二消息中可以携带第二会话的标识，此时，AMF实体中需要建立第一会话的标识和SMF实体标识之间的映射关系，也可以 携带标识信息，此时，AMF实体中需要建立标识信息与SMF实体之间的映射关系，也可以既携带第一会话的标识又携带标识信息，这样AMF实体需要建立第一会话的标识和SMF实体之间的映射关系和标识信息与SMF实体之间的映射关系中至少一项。
可选的，本发明实施例中的第一消息中还携带有第二指示信息，该第二指示信息用于指示第二会话的数据网络DN与第一会话的DN相同。则用户设备在接收到第二消息后，可以根据第二指示信息确定第二会话的数据网络DN和第一会话的DN相同。
可选的，在步骤S103之后，本发明实施例提供的方法还包括：
S112、SMF实体释放用户设备和第二UPF实体之间建立的第一会话。
其次，以第二场景为会话服务连续性模式2为例介绍。
在第二场景下，SMF实体可以配置标识信息也可以不配置标识信息，SMF实体配置标识和SMF不配置标识第一请求消息的内容不同，因此，以下将分别介绍：
以SMF实体配置标识信息为例，结合图3，如图6所示本发明实施例提供的方法在步骤S101之前，还包括：
S113、SMF实体配置标识信息，该标识信息用于指示AMF实体将第二消息发送给标识信息所关联的SMF实体。
可以理解的是，此时SMF实体向AMF实体发送的第一请求消息中携带标识信息以及第一消息，第一消息中携带标识信息以及会话释放时间，第一消息用于指示UE在会话释放时间内发送用于建立第二会话的请求。
具体的，在步骤S103之前，本发明实施例提供的方法还包括：步骤S111。具体的，步骤S111的实现方式参见上述实施例的描述，本发明实施例在此不再赘述。
可选的，第一消息中还携带第三指示信息，该第三指示用于指示UE在第二消息中携带标识信息，因此，本发明实施例中的步骤S104之前还可以包括以下步骤：
S114、UE在确定第一消息中携带第三指示信息，该第三指示信息用于指示UE在第二消息中携带标识信息，则UE在第二消息中携带标识信息。
可选的，用户设备确定在接收到第一消息中携带的标识信息后，将标识信息添加在第二消息中。
可选的，标识信息为UE通过AMF实体接收SMF实体配置的标识信息。
具体的，用户设备可以主动在第二消息中添加标识信息，也可以根据第一消息中携带的触发消息(例如，第三指示信息)将标识信息添加在第二消息中。
可选的，一方面，步骤S114可以通过以下方式实现：
S1141a、第一消息中携带第三指示信息，第三指示信息用于指示UE在第二消息中携带标识信息，则UE根据第三指示信息，将标识信息添加在第二消息中。
另一方面，步骤S114可以通过以下方式实现：
S1141b、UE获取第一会话的会话服务连续性模式。
S1142b、UE确定第一会话的会话服务连续性模式为第二模式，则UE将第一会话的标识确定为标识信息添加在第二消息中。
又一方面，步骤S114可以通过以下方式实现：
S1141c、第一消息中携带第四指示信息，该第四指示信息用于指示UE将第一会话的标识作为标识信息，用户设备根据所述第四指示信息将第一会话的标识确定为标识信息添加在第二消息中。
第二模式为会话服务连续性模式SSC2，SSC2是指网络侧允许UE在第一会话释放之前先建立第二会话，第二会话与第一会话的数据网络DN相同。在SSC2中第一会话与第一会话存在并存的时间段。
可选的，在第二场景下步骤S106的实现方式可以参见上述实施例中的S1061a和S1062a实现，本发明实施例在此不再赘述。
以SMF实体不配置标识信息为例，结合图3，如图7所示，图7与图6的区别在于：步骤S101中第一请求消息仅携带第一消息，其中，第一消息中携带会话释放时间，以及会话释放原因值为更改UPF实体。其中，第一消息用于指示用户设备在会话释放时间内发送第二消息且图7中省略了步骤S111。而图6中第一请求消息中不仅携带第一消息还携带标识信息，第一请求消息不仅用于指示AMF实体将第一消息发送给UE，而且还指示AMF实体建立标识信息和SMF实体之间的映射关系，且第一消息中携带标识信息和会话释放时间。
可选的，本发明实施例中的步骤S104之前还可以包括以下步骤：
S115、用户设备在接收到第一消息中携带的会话释放原因值后，将第一会话的标识添加在第二消息中。
可选的，第二消息中还可以携带第二会话的标识。
也即经过UE执行S115后第二消息中携带的标识信息即为第一会话的标识。
则步骤S106可以通过以下方式实现：
S1061c、AMF实体根据第一会话的标识，将第二消息发送给第一会话的标识所关联的SMF实体。
可以理解的是，此时由于SMF实体并未释放和用户设备之间建立的第一会话，因此，AMF实体中存储有第一会话的标识和SMF实体之间的映射关系，因此AMF实体可以根据第一会话的标识，将第二消息发送给第一会话的标识所关联的SMF实体。
可以理解的是，在图6和图7所描述的实施例中，其共同点在于：在步骤S107之后，还包括：
S116、在会话释放时间后，SMF实体释放第二UPF实体与用户设备之间建立的第一会话。
可选的，图6和图7所描述的实施例中第一消息中还携带第二指示信息，该第二指示信息用于指示UE第二会话和第一会话具有相同的DN。
可以理解的是，在SMF实体不论是通过会话服务连续性模式1还是会话服务连续性模式2重建第二会话，在SMF实体触发用户设备发送第二消息之前，用户设备和SMF实体之间均存在第一会话。即第一会话为SMF实体触发用户设备发送第二消息之前，SMF实体通过第二UPF实体建立的与用户设备之间的会话。
可选的，本发明实施例中第二消息中还可以携带标识信息、第一会话的标识或者与第一会话的标识相同的第二会话的标识(此种情况为SMF实体采用会话服务连续性模式2建立与用户设备之间的会话)，这样SMF实体在接收到标识信息后可以直接确定选择第一UPF实体建立和用户设备之间的第二会话。
可以理解的是，本发明实施例中的第一UPF实体为SMF实体触发UE发送第二消息之前已经选择的。
可以理解的是，本发明上述实施例中，UE可以根据通过AMF实体接收到的SMF实体发送的指示信息来确定将第一会话的标识作为标识信息添加到第二消息中(此种情况用于SS1模式)，将第二会话的标识作为标识信息添加到第二消息中(此种情况用于SS2模式)，也可以将SMF实体配置的标识信息添加到第二消息中(此时第一消息中应该携带SMF实体配置的标识信息)，另一方面，UE根据第一会话的会话服务连续性模式来确定将第一会话的标识作为标识信息添加到第二消息中(此种情况用于SS1模式)，将第二会话的标识作为标识信息添加到第二消息中(此种情况用于SS2模式)。
如图8所示，图8示出了本发明实施例提供的一种会话建立方法的具体实现方式，图8所示的方式适用于上述实施例所描述的会话服务连续性模式2，即SMF实体先建立第二会话，SMF实体再释放第一会话。
SMF实体决定重新选择UPF实体建立新会话，执行S801、配置标识信息。
S802、SMF实体向AMF实体发送第一请求消息，该第一请求消息中携带第一消息以及标识信息，该第一消息中携带会话释放时间以及标识信息，第一消息用于指示用户设备发送用于请求建立第二会话的消息。
具体的，第一请求消息用于指示AMF实体建立标识信息与SMF实体标识之间的映射关系，以及将第一消息发送给用户设备。
S803、AMF实体根据第一请求消息建立标识信息与SMF实体标识之间的映射关系。
S804、AMF实体将第一消息发送给用户设备。
可以理解的是，在实际过程中步骤S803和S804的先后顺序可以调换，即AMF实体先执行S804再执行S803，或者AMF实体同时执行S803和S804，步骤S803和S804的先后顺序对本发明实施例的方案不构成影响。
S805、用户设备向AMF实体发送携带标识信息的第二消息，该标识信息用于指示AMF实体将第二消息发送给标识信息所关联的SMF实体，第二消息用于指示SMF实体根据标识信息建立第一UPF与SMF实体之间的会话。
可以理解的是，
S806、AMF实体接收第二消息，第二消息中携带标识信息。
S807、AMF实体根据标识信息，将第二消息发送给标识信息所关联的SMF实体。
S808、SMF实体在接收到第二消息后，建立第一UPF实体与用户设备之间的第二会话。
S809、SMF实体在会话释放时间后释放用户设备与第二UPF实体之间建立的第一会话。
如图9所示，图9示出了本发明实施例提供的又一种会话建立方法的具体实现方式，图9与图8的共同之处在于，均适用于上述实施例所描述的会话服务连续性模式2，即SMF实体先建立第二会话，SMF实体再释放第一会话。
图9与图8的区别在于：图9在S802之前省略了步骤S801，且步骤S802中第一请求消息中仅携带第二消息，且图9中第二消息中携带的内容为：会话释放时间以及会话释放原因值，其中，会话释放原因值用于指示用户设备为第一会话分配与第二会话不同的标识，且图9中S805中的第一消息中至少携带第一会话的标识(还可以既携带第二会话的标识也携带第一会话的标识)，第一会话的标识用于指示AMF实体将第二消息发送给第一会话的标识所关联的SMF实体(可以理解的是，在此种会话服务连续性模式2下，AMF实体中预先存储有SMF实体已经建立的每个会话和建立该会话的SMF实体之间的映射关系，即AMF实体中预先存储有预设映射关系表，该表中至少存储有第一会话的标识和第一会话的标识所关联的SMF实体，其中，第一会话的标识所关联的SMF实体为建立第一会话的SMF实体)。此时，第二会话的标识即为标识信息。
具体的，在图9中可以采用步骤S907代替图8中的S807。
S907、AMF实体根据第一会话的标识从预设映射关系表中确定第二会话的标识所关联的SMF实体。
如图10所示，图10示出了本发明实施例提供的又一种会话建立方法的具体实现方式，图10与图9和图8的区别在于：图10所提供的方法适用于上述实施例中的会话服务连续性模式1，即先释放第一会话，再建立第二会话。
S1101、SMF实体决定重新选择UPF实体，向AMF实体发送第一请求消息，该第一请求消息中携带第一消息以及第一会话释放通知消息，其中，第一消息中携带释放第一会话的原因值为重新建立会话，第一消息用于指示UE为第二会话和第一会话分配相同的标识，第一会话释放通知消息用于指示AMF实体建立第一会话的标识与SMF实体标识之间的映射关系。
可以理解的是，第一请求消息用于指示AMF实体将第一会话释放通知消息(即第一消息)发送给UE。
S1102、AMF实体保存第一会话的标识与SMF实体标识之间的映射关系。
S1103、AMF实体向用户设备发送第一消息。
S1104、SMF实体释放用户设备与第二UPF实体之间建立的第一会话。
S1105、用户设备为第一会话分配与第二会话相同的标识。
S1106、用户设备向AMF实体发送第二消息，该第二消息中携带第一会话的标识。其中，第一会话的标识用于指示AMF实体将第二消息发送给第一会话的标识所关联的SMF实体，第二消息用于指示SMF实体建立与用户设备之间的第二会话。
即标识信息为第一会话的标识。
S1107、AMF实体根据第一会话的标识确定第一会话的标识所关联的SMF实体。
S1108、AMF实体将第二消息发送给第一会话的标识指示的SMF实体。
S1109、SMF实体根据第二消息建立用户设备与第一UPF实体之间的第二会话。
本发明实施例提供一种会话建立方法，通过在第二消息中携带标识信息，然后AMF实体根据该标识信息将第二消息发送给标识信息指定的SMF实体，这是由于SMF实体触发用户设备发送第二消息的目的在于重新建立会话，而在会话建立系统中，用户设备发送的第二消息需要通过AMF实体才能转发给SMF实体，AMF实体在转发第二消息时需要执行选择SMF实体的过程，因此，本发明实施例中通过标识信息可以避免AMF实体在接收到第二消息时需要重新执行选择SMF实体的过程导致的处理效率低的问题，且可以避免AMF实体所选择的SMF实体与触发用户设备发送第二消息的SMF实体不一致的问题，进一步的本发明实施例中通过标识信息可以使得SMF实体在接收到标识信息后不需要再次执行重选UPF实体的过程，这是由于SMF实体触发UE发送第二消息往往是因为SMF实体在触发UE发送第二消息之前已确定此时与UE建立会话的UPF实体(例如，第一UPF实体)已经不能满足用户需要，并选择了合适的UPF实体(例如，第一UPF实体)重新建立与UE之间的第二会话，这样可以进一步使得最终所建立的第二会话能够优实体化用户面。
上述主要从用户设备、AMF实体和SMF实体之间交互的角度对本申请提供的方案进行了介绍。可以理解的是，用户设备、AMF实体和SMF实体等为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的用户设备、AMF实体和SMF实体及方法步骤，本发明能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本发明实施例可以根据上述方法示例对用户设备、AMF实体和SMF实体等进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本发明实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
在采用对应各个功能划分各个功能模块的情况下，图11a示出了上述实施例中所涉及的AMF实体的一种可能的结构示意图，AMF实体10包括：发送单元401以及接收单元402。其中，接收单元402用于支持AMF实体10执行上述实施例中的步骤S102、S806；发送单元401用于支持AMF实体10执行上述实施例中的步骤S103、S804、S807、S1104以及S1108。可以理解的是，本发明实施例提供的AMF实体10还可以包括建立单元403、保存单元404以及确定单元405，其中，建立单元403用于支持AMF实体10执行上述实施例中的步骤S111，保存单元404用于支持AMF 实体10执行上述实施例中的步骤S108以及S1102，建立单元403用于支持AMF实体10执行上述实施例中的步骤S111以及S1102，可选的AMF实体还包括确定单元405，用于支持UE执行上述实施例中的步骤S1061a、S1061b、S1107以及S907。上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
具体的，在硬件实现上，上述接收单元402可以为AMF实体10的接收器，发送单元401可以为AMF实体10的发送器，其中，发送器和收发器可以集成在一起构成如图2b所示的收发器。建立单元403、保存单元404以及确定单元405可以集成在AMF实体10的处理器上。
在采用集成的单元的情况下，图11b示出了上述实施例中所涉及的AMF实体10的一种可能的逻辑结构示意图。AMF实体10包括：处理模块512和通信模块513。处理模块512用于对AMF实体10的动作进行控制管理，例如，处理模块512用于执行上述实施例中的步骤S102、S806、步骤S103、S106(S1062a、S1062b以及S1062c)、S804、S807、S1104以及S1108，S1061a、S1061b、S1061c、S804、S807、S1104以及S1108、S108、S111、S803、S1102、S1061a、S1061b、S907以及S1107，和/或用于本文所描述的技术的其他过程。通信模块513用于支持AMF实体10与用户设备及SMF实体的通信。AMF实体10还可以包括存储模块511，用于存储AMF实体10的程序代码和数据。
其中，处理模块512可以是处理器或控制器，例如可以是中央处理器单元，通用处理器，数字信号处理器，专用集成电路，现场可编程门阵列或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本发明公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，数字信号处理器和微处理器的组合等等。通信模块513可以是收发器、收发电路或收发器等。存储模块511可以是存储器。
当处理模块512为处理器，通信模块513为收发器，存储模块511为存储器时，本发明实施例所涉及的AMF实体可以为图2b所示的设备。
在采用对应各个功能划分各个功能模块的情况下，图12a示出了上述实施例中所涉及的SMF实体的一种可能的结构示意图，SMF实体20包括：发送单元601、接收单元602以及建立单元603。其中，接收单元602用于支持SMF实体20执行上述实施例中的步骤S107a，S808，建立单元603，用于支持SMF实体20执行上述实施例中的步骤S107、S112、S116以及S809以及S1102以及S1109。可以理解的是，本发明实施例中的SMF实体还包括发送单元601以及配置单元604，其中，发送单元601用于支持SMF实体20执行上述实施例中的步骤S101、S802、S1101，配置单元604用于支持SMF实体20执行上述实施例中的步骤S110、S113以及S801。上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
具体的，在硬件实现上，上述发送单元601可以为SMF实体的发送器，接收单元602可以为SMF实体的接收器，其中接收器和发送器可以集成在一起构成SMF实 体20的收发器，如图2c所示。建立单元603和配置单元604可以集成在SMF实体20的处理器上。
在采用集成的单元的情况下，图12b示出了上述实施例中所涉及的SMF实体20的一种可能的逻辑结构示意图。SMF实体20包括：处理模块712和通信模块713。处理模块712用于对SMF实体20的动作进行控制管理，例如，处理模块712用于支持SMF实体20执行上述实施例中的步骤S107a，S808，S107、S112、S116以及S809以及S1102以及S1109、S101、S802、S1101，S110、S113以及S801，和/或用于本文所描述的技术的其他过程。通信模块713用于支持SMF实体20与AMF实体通信。SMF实体20还可以包括存储模块711，用于存储SMF实体20的程序代码和数据。
其中，处理模块712可以是处理器或控制器，例如可以是中央处理器单元，通用处理器，数字信号处理器，专用集成电路，现场可编程门阵列或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本发明公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，数字信号处理器和微处理器的组合等等。通信模块713可以是收发器、收发电路或收发器等。存储模块711可以是存储器。
当处理模块712为处理器，通信模块713为收发器，存储模块711为存储器时，本发明实施例所涉及的SMF实体可以为图2c所示的设备。
在采用对应各个功能划分各个功能模块的情况下，图13a示出了上述实施例中所涉及的用户设备的一种可能的结构示意图，用户设备30包括：建立单元801、接收单元802、分配单元803以及发送单元804。其中，建立单元801用于指示UE执行上述实施例中的S101a，接收单元802用于支持用户设备30执行上述实施例中的步骤S104、S1102以及S1105，分配单元803，用于支持用户设备30执行上述实施例中的步骤S109(S1091a、S1092b)以及S1105，发送单元804用于支持用户设备30执行上述实施例中的步骤S104以及S1106，可以理解的是，用户设备30还包括获取单元805，用于指示UE执行S1091b。上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在采用对应各个功能划分各个功能模块的情况下，图13b示出了上述实施例中所涉及的用户设备的一种可能的结构示意图，用户设备30包括：建立单元901、接收单元902、以及发送单元903。其中，建立单元901用于支持UE执行上述实施例中的S101a，接收单元902用于支持用户设备30执行上述实施例中的步骤S104，发送单元903用于支持用户设备30执行上述实施例中的步骤S104以及步骤S805。用户设备还包括确定单元和获取单元，确定单元用于支持用户设备执行S114(S1141a、S1141b、S1142b)、S115，获取单元，用于指示用户设备执行S1141b。上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
具体的，在硬件实现上，上述发送单元903、发送单元804可以为用户设备30的发送器，接收单元902、分配单元803可以为用户设备30的接收器，其中接收器和发送器可以集成在一起构成用户设备30的收发器，如图2d所示。分配单元803、建立 单元901、确定单元、分配单元802可以集成在用户设备30的处理器上。
在采用集成的单元的情况下，图13c示出了上述实施例中所涉及的用户设备30的一种可能的逻辑结构示意图。用户设备30包括：处理模块1012和通信模块1013。处理模块1012用于对用户设备30的动作进行控制管理，例如，处理模块1012用于支持用户设备30执行上述实施例中的步骤S101a、S104、S1102以及S1105，S109(S1091a、S1092b)以及S1105，S104以及S1106以及S1091b或者S101a，S104，S104以及步骤S805，S114(S1141a、S1141b、S1142b)、S115。和/或用于本文所描述的技术的其他过程。通信模块1013用于支持用户设备30与AMF实体通信。用户设备30还可以包括存储模块1011，用于存储用户设备30的程序代码和数据。
其中，处理模块1012可以是处理器或控制器，例如可以是中央处理器单元，通用处理器，数字信号处理器，专用集成电路，现场可编程门阵列或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本发明公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，数字信号处理器和微处理器的组合等等。通信模块1013可以是收发器、收发电路或收发器等。存储模块1011可以是存储器。
当处理模块1012为处理器，通信模块1013为收发器，存储模块1011为存储器时，本发明实施例所涉及的SMF实体可以为图2d所示的设备。
一方面，本发明实施例提供一种计算机可读存储介质，计算机可读存储介质中存储有指令，当计算机可读存储介质在SMF实体上运行时，使得SMF实体执行上述实施例中的步骤S107a，S808，S107、S112、S116以及S809以及S1102以及S1109、S101、S802、S1101，S110、S113以及S801。
另一方面，本发明实施例提供一种计算机可读存储介质，计算机可读存储介质中存储有指令，当计算机可读存储介质在AMF实体上运行时，使得AMF实体执行上述实施例中的步骤S102、S806、步骤S103、S106(S1062a、S1062b以及S1062c)、S804、S807、S1104以及S1108，S1061a、S1061b、S1061c、S804、S807、S1104以及S1108、S108、S111、S803、S1103、S1061a、S1061b、以及S907以及S1107。
又一方面，本发明实施例提供一种计算机可读存储介质，计算机可读存储介质中存储有指令，当计算机可读存储介质在用户设备上运行时，使得用户设备执行上述实施例中的步骤S101a、S104、S1102以及S1105，S109(S1091a、S1092b)以及S1105，S104以及S1106以及S1091b或者S101a，S104，S104以及步骤S805，S114(S1141a、S1141b、S1142b)、S115。
在上述实施例中，可以全部或部分的通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式实现。计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例多描述的流程或功能。所述计算机可以使通用计算机、专用计算机、计算机网络、或者其他可编程装置。计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介 质传输，例如，计算机指令可以从一个网站站点，计算机、服务器或数据中心通过有线(例如，同轴电缆、光纤、数字用户线DSL)或无线(例如，红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心传输。计算机可读存储介质可以是计算机能够读取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以使磁性介质，(例如，软盘，硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如，固态硬盘(Solid Stste Disk,SSD))等。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将装置的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述模块或单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：快闪存储器、移动硬盘、只读存储器、随机存取存储器、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何在本申请揭露的技术范围内的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (42)

  1. 一种会话建立方法，其特征在于，包括：
    用户设备UE通过会话管理功能SMF实体建立第一会话；
    所述UE接收移动性管理功能AMF实体发送的第一消息，所述第一消息用于指示所述UE发送用于建立第二会话的请求；
    所述UE为所述第二会话分配与所述第一会话相同的标识；
    所述UE向所述AMF实体发送第二消息，所述第二消息用于所述UE请求建立所述第二会话，所述第二消息中携带所述第二会话的标识，所述第二会话的标识用于所述AMF实体将所述第二消息发送给所述SMF实体。
  2. 根据权利要求1所述的方法，其特征在于，所述第一消息中携带第一指示信息，所述第一指示信息用于指示所述UE为所述第二会话分配与所述第一会话相同的标识，所述UE为所述第二会话分配与所述第一会话相同的标识，包括：
    所述UE根据所述第一指示信息，为所述第二会话分配与所述第一会话相同的标识。
  3. 根据权利要求1或2所述的方法，其特征在于，所述UE为所述第二会话分配与所述第一会话相同的标识，包括：
    所述UE获取所述第一会话的会话服务连续性模式；
    所述UE确定所述第一会话的会话服务连续性模式为第一模式，为所述第二会话分配与所述第一会话相同的标识。
  4. 根据权利要求1-3任意一项所述的方法，其特征在于，所述第一消息中携带标识信息，所述标识信息用于所述AMF实体将第二消息发送给所述SMF实体；
    所述第二消息中携带所述标识信息。
  5. 根据权利要求1-4任意一项所述的方法，其特征在于，所述第一消息中携带第二指示信息，所述第二指示信息用于指示所述第二会话的数据网络DN与所述第一会话的DN相同。
  6. 一种会话建立方法，其特征在于，包括：
    用户设备UE通过会话管理功能SMF实体建立第一会话；
    所述UE接收移动性管理功能AMF实体发送的第一消息，所述第一消息用于指示所述UE发送用于建立第二会话的请求；
    所述UE向所述AMF实体发送第二消息，所述第二消息用于请求建立所述第二会话，所述第一消息中携带标识信息，所述标识信息用于指示所述AMF实体将所述第二消息发送给所述SMF实体。
  7. 根据权利要求6所述的方法，其特征在于，所述第一消息中携带第三指示信息，所述第三指示信息用于指示所述UE在所述第二消息中携带所述标识信息。
  8. 根据权利要求6所述的方法，其特征在于，所述UE获取所述第一会话的会话服务连续性模式，所述UE确定所述第一会话的会话服务连续性模式为第二模式，所述UE将第一会话的标识确定为所述标识信息。
  9. 根据权利要求6所述的方法，其特征在于，所述第一消息中携带第四指示信息，所述第四指示信息用于指示所述UE将所述第一会话的标识作为所述标识信息，所述用户设备根据所述第四指示信息将第一会话的标识确定为所述标识信息。
  10. 根据权利要求6所述的方法，其特征在于，所述UE通过所述AMF实体接收所述SMF实体配置的所述标识信息。
  11. 根据权利要求6-10任意一项所述的方法，其特征在于，所述第一消息中携带第二指示信息，所述第二指示信息用于指示所述UE建立与所述第一会话的数据网络DN相同的第二会话。
  12. 一种会话建立方法，其特征在于，包括：
    移动性管理功能AMF实体向用户设备UE发送第一消息，所述第一消息用于指示所述UE发送用于建立第二会话的请求；
    所述AMF实体接收所述UE发送的第二消息，所述第二消息中携带标识信息，所述标识信息用于指示所述AMF实体将所述第二消息发送给标识信息所关联的会话管理功能SMF实体；所述第二消息用于所述UE请求建立第二会话；
    所述AMF实体根据所述标识信息，将所述第二消息发送给所述SMF实体。
  13. 根据权利要求12所述的方法，其特征在于，所述第一消息中携带第三指示信息，所述第三指示信息用于指示所述UE在所述第二消息中携带所述标识信息。
  14. 根据权利要求12所述的方法，其特征在于，所述标识信息为所述SMF实体配置的，所述移动性管理功能AMF实体向用户设备UE发送第一消息之前，所述方法还包括：
    所述AMF实体接收所述SMF实体发送的第一请求消息，所述第一请求消息用于指示所述AMF实体建立所述标识信息与所述SMF实体标识之间的映射关系。
  15. 根据权利要求12所述的方法，其特征在于，所述移动性管理功能AMF实体向用户设备UE发送第一消息之前，还包括：
    所述AMF实体接收所述SMF实体发送的第一请求消息，所述第一请求消息用于指示所述AMF实体保存第一会话的标识与所述SMF实体之间的映射关系；所述第一会话为所述SMF实体发送所述第一请求消息之前，所述SMF实体与所述UE之间建立的会话；
    所述AMF实体根据所述第一请求消息，保存所述第一会话的标识与所述SMF实体之间的映射关系。
  16. 根据权利要求15所述的方法，其特征在于，所述第一消息中还携带第一指示信息，所述第一指示信息用于指示所述UE为所述第二会话分配与所述第一会话相同的标识，则所述标识信息为所述第二会话的标识。
  17. 根据权利要求12所述的方法，其特征在于，所述第一消息中携带第四指示信息，所述第四指示信息用于指示所述UE将所述第一会话的标识作为所述标识信息。
  18. 一种会话建立方法，其特征在于，包括：
    会话管理功能SMF实体向移动性管理功能AMF实体发送第一请求消息，所述第 一请求消息用于指示所述AMF实体将第一消息发送给用户设备UE，所述第一消息用于指示所述UE发送用于建立第二会话的第二消息；
    所述SMF实体接收所述AMF实体发送的所述第二消息，所述第二消息用于指示建立第二会话；
    所述SMF实体根据所述第二消息建立与用户设备UE之间的第二会话。
  19. 根据权利要求18所述的方法，其特征在于，所述第一消息中携带第三指示信息，所述第三指示信息用于指示所述UE在所述第二消息中携带标识信息。
  20. 根据权利要求18所述的方法，其特征在于，所述会话管理功能SMF实体向所述AMF实体发送第一请求消息之前，所述方法还包括：
    所述SMF实体配置标识信息，所述标识信息用于指示所述AMF实体将所述第二消息发送给所述SMF实体；
    所述第一请求消息还用于指示所述AMF实体建立所述标识信息与所述SMF实体之间的映射关系。
  21. 根据权利要求18所述的方法，其特征在于，所述第一请求消息还用于指示所述AMF实体建立第一会话的标识和所述SMF实体之间的关系，所述第二消息中还携带第一指示信息，所述第一指示信息用于指示所述UE为第一会话和第二会话分配相同的会话标识，所述标识信息为所述第二会话的标识，所述第一会话为所述SMF实体发送所述第一请求消息之前所述SMF实体与所述UE之间建立的会话。
  22. 根据权利要求18所述的方法，其特征在于，所述第一消息中携带第四指示信息，所述第四指示信息用于指示所述UE将所述第一会话的标识作为所述标识信息，所述标识信息为所述第一会话的标识。
  23. 一种用户设备，其特征在于，包括：
    建立单元，用于通过会话管理功能SMF实体建立第一会话；
    接收单元，用于接收移动性管理功能AMF实体发送的第一消息，所述第一消息用于指示用户设备UE发送用于建立第二会话的请求；
    分配单元，用于为所述第二会话分配与所述第一会话相同的标识；
    发送单元，用于向所述AMF实体发送第二消息，所述第二消息用于所述UE请求建立所述第二会话，所述第二消息中携带所述第二会话的标识，所述第二会话的标识用于所述AMF实体将所述第二消息发送给所述SMF实体。
  24. 根据权利要求23所述的用户设备，其特征在于，所述第一消息中携带第一指示信息，所述第一指示信息用于指示所述UE为所述第二会话分配与所述第一会话相同的标识，所述分配单元，具体用于根据所述第一指示信息，为所述第二会话分配与所述第一会话相同的标识。
  25. 根据权利要求23或24所述的用户设备，其特征在于，所述用户设备还包括：
    获取单元，用于获取所述第一会话的会话服务连续性模式；
    所述分配单元，具体用于确定所述第一会话的会话服务连续性模式为第一模式，则为所述第二会话分配与所述第一会话相同的标识。
  26. 一种用户设备，其特征在于，包括：
    建立单元，通过会话管理功能SMF实体建立第一会话；
    接收单元，用于接收移动性管理功能AMF实体发送的第一消息，所述第一消息用于指示用户设备UE发送用于建立第二会话的请求；
    发送单元，用于向所述AMF实体发送第二消息，所述第二消息用于请求建立所述第二会话，所述第一消息中携带标识信息，所述标识信息用于指示所述AMF实体将所述第二消息发送给所述标识信息所关联的所述SMF实体。
  27. 根据权利要求26所述的用户设备，其特征在于，所述用户设备还包括：
    获取单元，用于获取所述第一会话的会话服务连续性模式；
    所述确定单元，用于确定所述第一会话的会话服务连续性模式为第二模式，则所述将第一会话的标识确定为所述标识信息。
  28. 根据权利要求26所述的用户设备，其特征在于，所述用户设备还包括：
    确定单元，用于在确定所述第一消息中携带第四指示信息，则将第一会话的标识确定为所述标识信息携带在所述第二消息中，所述第四指示信息用于指示所述UE将所述第一会话的标识作为所述标识信息。
  29. 根据权利要求26所述的用户设备，其特征在于，所述接收单元，还用于通过所述AMF实体接收所述SMF实体配置的所述标识信息。
  30. 根据权利要求26-29任意一项所述的用户设备，其特征在于，所述第一消息中携带第二指示信息，所述第二指示信息用于指示所述UE建立与所述第一会话的数据网络DN相同的第二会话。
  31. 一种移动性管理功能AMF实体，其特征在于，包括：
    发送单元，用于向用户设备UE发送第一消息，所述第一消息用于指示所述UE发送用于建立第二会话的请求；
    接收单元，用于接收所述用户设备UE发送的第二消息，所述第二消息中携带标识信息，所述标识信息用于指示所述AMF实体将所述第二消息发送给标识信息所关联的会话管理功能SMF实体；所述第二消息用于指示所述UE请求建立第二会话；
    所述发送单元，用于根据所述标识信息，将所述第二消息发送给所述SMF实体。
  32. 根据权利要求31所述的AMF实体，其特征在于，所述第一消息中携带第三指示信息，所述第三指示信息用于指示所述UE在所述第二消息中携带所述标识信息。
  33. 根据权利要求31所述的AMF实体，其特征在于，所述接收单元，还用于接收所述SMF实体发送的第一请求消息，所述第一请求消息用于指示所述AMF实体建立所述标识信息与所述SMF实体之间的映射关系；
    所述AMF实体还包括：建立单元，于根据所述第一请求消息建立所述标识信息与所述SMF实体标识之间的映射关系；
    所述发送单元具体用于：将所述第二消息发送给与所述标识信息存在对应关系的SMF实体。
  34. 根据权利要求31所述的AMF实体，其特征在于，所述接收单元，还用于接收所述SMF实体发送的第一请求消息，所述第一请求消息用于指示所述AMF实体保存第一会话的标识与所述SMF实体之间的映射关系；所述第一会话为所述SMF实体发送所述第一请求消息之前所述SMF实体与所述UE之间建立的会话；
    所述AMF实体还包括：保存单元，用于根据所述第一请求消息，保存所述第一会话的标识与所述SMF实体之间的映射关系。
  35. 一种会话管理功能SMF实体，其特征在于，包括：
    发送单元，用于向移动性管理功能AMF实体发送第一请求消息，所述第一请求消息用于指示所述AMF实体将第一消息发送给用户设备UE，所述第一消息用于指示所述UE发送用于建立第二会话的第二消息；
    接收单元，用于接收所述AMF实体发送的第二消息，所述第二消息用于指示UE请求建立第二会话；
    建立单元，用于根据所述第二消息建立与用户设备UE之间的第二会话。
  36. 根据权利要求35所述的SMF实体，其特征在于，所述第一消息中携带第三指示信息，所述第三指示信息用于指示所述UE在所述第二消息中携带标识信息。
  37. 根据权利要求35所述的SMF实体，其特征在于，所述SMF实体还包括：
    配置单元，用于配置标识信息，所述标识信息用于指示所述AMF实体将第二消息发送给所述SMF实体；所述第一请求消息还用于指示所述AMF实体建立所述标识信息与所述SMF实体之间的映射关系。
  38. 一种移动性管理功能AMF实体，其特征在于，包括存储器、处理器、总线和收发器，存储器中存储代码和数据，处理器与存储器通过总线连接，处理器运行存储器中的代码使得所述AMF实体执行权利要求12-17中任意一项所述的会话建立方法。
  39. 一种会话管理功能SMF实体，其特征在于，包括存储器、处理器、总线和收发器，存储器中存储代码和数据，处理器与存储器通过总线连接，处理器运行存储器中的代码使得所述SMF实体执行权利要求18-22中任意一项所述的会话建立方法。
  40. 一种用户设备，其特征在于，包括存储器、处理器、总线和收发器，存储器中存储代码和数据，处理器与存储器通过总线连接，处理器运行存储器中的代码使得所述用户设备执行如权利要求1-5或者执行权利要求6-11中任意一项权利要求所述的会话建立方法。
  41. 一种计算机可读存储介质，包括指令，当其在AMF实体上运行时，使得AMF实体执行权利要求12-17中任意一项所述的会话建立方法，或者当其在SMF实体上执行时，使得SMF实体执行权利要求18-22中任意一项所述的会话建立方法，或者当其在用户设备上运行时，使得用户设备执行如权利要求1-5或者执行权利要求6-11中任意一项权利要求所述的会话建立方法。
  42. 一种会话建立系统，其特征在于，包括权利要求31-34中任意一项所述的AMF实体，权利要求35-37中任意一项所述的SMF实体，以及权利要求23-25中任 意一项所述的用户设备或者权利要求26-30中任意一项所述的用户设备。
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