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WO2018166329A1 - 会话重建的方法和装置、访问和移动性管理功能实体、会话管理功能实体及终端 - Google Patents

会话重建的方法和装置、访问和移动性管理功能实体、会话管理功能实体及终端 Download PDF

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Publication number
WO2018166329A1
WO2018166329A1 PCT/CN2018/076821 CN2018076821W WO2018166329A1 WO 2018166329 A1 WO2018166329 A1 WO 2018166329A1 CN 2018076821 W CN2018076821 W CN 2018076821W WO 2018166329 A1 WO2018166329 A1 WO 2018166329A1
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WIPO (PCT)
Prior art keywords
session
pdu session
identifier information
smf
identification information
Prior art date
Application number
PCT/CN2018/076821
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English (en)
French (fr)
Inventor
张娟
Original Assignee
电信科学技术研究院有限公司
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Filing date
Publication date
Application filed by 电信科学技术研究院有限公司 filed Critical 电信科学技术研究院有限公司
Priority to JP2019551281A priority Critical patent/JP6952787B2/ja
Priority to US16/495,032 priority patent/US10827553B2/en
Priority to EP18767923.8A priority patent/EP3585130B1/en
Priority to KR1020197030685A priority patent/KR20190127869A/ko
Priority to KR1020217038868A priority patent/KR102471046B1/ko
Priority to KR1020227040881A priority patent/KR20220162851A/ko
Publication of WO2018166329A1 publication Critical patent/WO2018166329A1/zh

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    • 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
    • H04W76/19—Connection re-establishment
    • 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
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/045—Interfaces between hierarchically different network devices between access point and backbone network device
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices

Definitions

  • the present disclosure relates to the technical field of communication applications, and in particular, to a method and apparatus for session reconstruction, an access and mobility management function entity AMF, a session management function entity SMF, and a terminal.
  • the Next Gen system supports multiple continuity requirements for packet data unit (PDU) session sessions.
  • PDU packet data unit
  • SSC session continuity
  • SSC mode 1 refers to assigning a User Plane Function (UPF) to this PDU session.
  • UPF User Plane Function
  • the SSC mode 2 means that the UPF allocated for the PDU session can be maintained only in a certain service area.
  • the user equipment User Equipment, UE removes the service area of the UPF, the UE needs to select a new UPF.
  • SSC mode 3 refers to a PDU session that was previously selected for a UPF to establish a data network. Before the UE terminates the connection to this UPF, a new PDU session to the same data network is established and a new UPF is selected for this new PDU session. The UE may transfer the data stream to the new PDU session and then delete the previous PDU session connection.
  • the network may inform the UE to create a new PDU session to the same data network.
  • the newly established PDU session and the old PDU session are selected to the same Session Management Function (SMF).
  • SMF Session Management Function
  • AMF Access and Mobility Management Function
  • the present disclosure provides a method and apparatus for session reestablishment, an access and mobility management function entity AMF, a session management function entity SMF, and a terminal, to solve the current mechanism cannot guarantee that AMF will select two PDU sessions to the same data network. The problem into the same SMF.
  • an embodiment of the present disclosure provides a method for session reestablishment, which is applied to an access and mobility management function entity AMF, including:
  • NAS message is used to request to establish a new PDU session that is connected to the same data network as the initial PDU session, where the NAS message carries the first identifier information and the initial PDU session.
  • second identifier information that is allocated to the new PDU session;
  • the step of sending a session management request to the session management function entity SMF corresponding to the first identifier information includes:
  • the NAS message is a PDU session establishment request, where the PDU session identification information of the PDU session establishment request carries the first identifier information, and the N1 session management message of the PDU session establishment request carries Describe the second identification information;
  • the step of parsing the NAS message to obtain the first identifier information includes:
  • the NAS message is a PDU session reestablishment request, and the PDU session identification information of the PDU session reestablishment request carries the first identifier information and the second identifier information;
  • the step of parsing the NAS message to obtain the first identifier information includes:
  • the method for reestablishing the session further includes:
  • the second identification information sent by the SMF and the identification information of the SMF are obtained, and are saved according to the corresponding relationship.
  • an embodiment of the present disclosure further provides an apparatus for session reestablishment, which is applied to an access and mobility management function entity AMF, including:
  • a first acquiring module configured to acquire a non-access stratum NAS message sent by the terminal, where the NAS message is used to request to establish a new PDU session that is connected to the same data network as the initial PDU session, where the NAS message carries an initial PDU session.
  • the first identification information and the second identification information that the terminal allocates for the new PDU session;
  • a first sending module configured to send a session management request to the session management function entity SMF corresponding to the first identifier information, where the session management request carries the first identifier information and the second identifier information, where the session management The request is used to enable the SMF to establish the new PDU session according to the first identifier information and the second identifier information.
  • the first sending module includes:
  • a parsing submodule configured to parse the NAS message to obtain the first identifier information
  • Obtaining a sub-module configured to acquire SMF identification information corresponding to the first identifier information according to a correspondence between the pre-stored PDU session identifier information and the SMF identifier information;
  • a sending submodule configured to send the session management request to the SMF corresponding to the SMF identification information.
  • the NAS message is a PDU session establishment request, where the PDU session identification information of the PDU session establishment request carries the first identifier information, and the N1 session management message of the PDU session establishment request carries Describe the second identification information;
  • the parsing sub-module is configured to parse the PDU session identification information in the PDU session establishment request to obtain the first identifier information.
  • the NAS message is a PDU session reestablishment request
  • the PDU session identification information of the PDU session reestablishment request carries the first identifier information and the second identifier information
  • the parsing sub-module is configured to parse the PDU session identification information of the PDU session reestablishment request to obtain the first identifier information and the second identifier information.
  • the device for reestablishing the session further includes:
  • the second obtaining module is configured to obtain the second identifier information sent by the SMF and the identifier information of the SMF, and save the information according to the corresponding relationship.
  • an embodiment of the present disclosure further provides an access and mobility management function entity AMF, including a first memory, a first processor, and being stored on the first memory and operable on the first processor.
  • a computer program the step of the method of implementing session reconstruction as described above when the first processor executes the computer program.
  • an embodiment of the present disclosure further provides a method for session reestablishment, which is applied to a session management function entity SMF, including:
  • Obtaining a session management request sent by the AMF where the session management request is sent after the AMF receives the NAS message sent by the terminal according to the notification message, and the NAS message and the session management request both carry an initial PDU session.
  • the first identification information and the second identification information of the new PDU session, and the SMF is an SMF corresponding to the first identification information, and the initial PDU session is connected to the same data network as the new PDU session;
  • the step of establishing the new PDU session according to the first identifier information and the second identifier information including:
  • the method further includes:
  • an embodiment of the present disclosure further provides an apparatus for session reestablishment, which is applied to a session management function entity SMF, including:
  • a second sending module configured to send, to the terminal, a notification message for re-establishing a PDU session
  • a third acquiring module configured to acquire a session management request sent by the AMF, where the session management request is sent by the AMF after receiving the NAS message sent by the terminal according to the notification message, and the NAS message and the session management
  • the request carries the first identification information of the initial PDU session and the second identification information of the new PDU session
  • the SMF is an SMF corresponding to the first identification information
  • the initial PDU session is connected to the new PDU session.
  • a establishing module configured to establish the new PDU session according to the first identifier information and the second identifier information.
  • the establishing module includes:
  • Selecting a submodule configured to select a new user plane anchor UPF for the new PDU session according to the first identifier information and the second identifier information;
  • the device for reestablishing the session further includes:
  • the third sending module is configured to establish a correspondence between the second identifier information and the identifier information of the SMF, and send the second identifier information and the identifier information of the SMF to the AMF.
  • an embodiment of the present disclosure further provides a session management function entity SMF, including a second memory, a second processor, and a computer program stored on the second memory and operable on the second processor, The step of implementing the session management function entity SMF in the method of session reconstruction when the second processor executes the computer program.
  • a session management function entity SMF including a second memory, a second processor, and a computer program stored on the second memory and operable on the second processor
  • an embodiment of the present disclosure further provides a method for session reestablishment, which is applied to a terminal, including:
  • the NAS message is used to request to establish a new PDU session connected to the same data network with the initial PDU session, the NAS message carrying The first identifier information of the initial PDU session and the second identifier information of the new PDU session, where the NAS message is used to send the AMF to the SMF corresponding to the first identifier information, and carry the first And a session management request for identifying the information and the second identifier information, where the session management request is used to enable the SMF to establish the new PDU session according to the first identifier information and the second identifier information.
  • the sending the non-access stratum message to the AMF includes:
  • the first identifier information is added to the PDU session identifier information of the PDU session establishment request, and the second identifier information is added to the N1 session management message of the PDU session establishment request, and is sent to the AMF.
  • an embodiment of the present disclosure further provides a device for session reconstruction, which is applied to a terminal, and includes:
  • a fourth sending module configured to send a NAS message to the AMF according to the notification message of re-establishing the PDU session sent by the session management function entity SMF, where the NAS message is used to request to establish a new PDU connected to the same data network as the initial PDU session.
  • a session the NAS message carrying the first identifier information of the initial PDU session and the second identifier information of the new PDU session, where the NAS message is used to send the AMF to the SMF corresponding to the first identifier information, Sending a session management request carrying the first identifier information and the second identifier information, where the session management request is used to enable the SMF to establish the new PDU session according to the first identifier information and the second identifier information .
  • the fourth sending module is configured to add the first identifier information to the PDU session identifier information of the PDU session setup request, and add the second identifier to the N1 session management message of the PDU session setup request. Information and sent to the AMF.
  • an embodiment of the present disclosure further provides a terminal, including a third memory, a third processor, and a computer program stored on the third memory and operable on the third processor, the third The steps performed by the terminal in the method of session reconstruction described above are implemented when the processor executes the computer program.
  • an embodiment of the present disclosure further provides a computer readable storage medium having stored thereon a computer program, wherein the access and mobility management functions are implemented when the computer program is executed by a processor The steps performed by the entity AMF in the above method of session reconstruction.
  • an embodiment of the present disclosure further provides a computer readable storage medium having stored thereon a computer program, wherein when the computer program is executed by a processor, implementing the session management function entity SMF is The steps performed in the above method of session reconstruction.
  • an embodiment of the present disclosure further provides a computer readable storage medium having stored thereon a computer program, wherein when the computer program is executed by a processor, implementing the terminal in the session reconstruction The steps performed in the method.
  • the SMF sends a notification message for re-establishing a PDU session to the terminal; the terminal sends a non-access stratum message to the AMF according to the notification message, where the non-access stratum message carries the initial PDU session.
  • the first identifier information and the second identifier information that the terminal allocates for the new PDU session;
  • the AMF sends a session management request to the SMF corresponding to the first identifier information, where the session management request carries the first identifier information and the second identifier information;
  • the first identification information and the second identification information establish a new PDU session.
  • the embodiment of the present disclosure achieves the purpose of connecting a new PDU session to an SMF selected by an initial PDU session by carrying the first identification information and the second identification information in the non-access stratum message and the session management request.
  • FIG. 1 is a flowchart of a method of a method for session reconstruction according to some embodiments of the present disclosure
  • FIG. 2 is a workflow diagram of a method for session reconstruction according to further embodiments of the present disclosure.
  • FIG. 3 is a flow chart showing the operation of a method for session reconstruction in still other embodiments of the present disclosure
  • FIG. 4 is an interaction flowchart of a terminal, an AMF, an SMF, and a UPF in a method for session reconstruction according to some embodiments of the present disclosure
  • FIG. 5 is a flowchart of interaction between a terminal, an AMF, an SMF, and a UPF in a method for session reestablishment according to still another embodiment of the present disclosure
  • FIG. 6 is a structural block diagram of an apparatus for session reconstruction according to some embodiments of the present disclosure.
  • FIG. 7 is a structural block diagram of an AMF according to some embodiments of the present disclosure.
  • FIG. 8 is a structural block diagram of an apparatus for session reconstruction according to still another embodiment of the present disclosure.
  • FIG. 9 is a structural block diagram of an SMF according to some embodiments of the present disclosure.
  • FIG. 10 is a structural block diagram of an apparatus for session reconstruction according to still another embodiment of the present disclosure.
  • FIG. 11 is a structural block diagram of a terminal according to some embodiments of the present disclosure.
  • Embodiments of the present disclosure provide a method and apparatus for session reestablishment, AMF, SMF, and terminal, which solves the problem that the current mechanism cannot guarantee that AMF selects two PDU sessions to the same data network into the same SMF.
  • some embodiments of the present disclosure provide a method of session reconstruction, applied to an access and mobility management function entity AMF, including steps 101 and 102.
  • Step 101 Obtain a non-access stratum NAS message sent by the terminal, where the NAS message is used to request to establish a new PDU session that is connected to the same data network as the initial PDU session, where the NAS message carries the first identification information of the initial PDU session and The second identifier information that the terminal allocates for the new PDU session.
  • the non-access stratum NAS message is sent after the terminal receives the notification message for re-establishing the PDU session sent by the SMF, and the terminal establishes a new PDU session according to the notification message, and allocates new session identification information for the new PDU session, that is, the foregoing Two identification information.
  • the non-access stratum message sent by the terminal to establish a new PDU session is different from the NAS message that is normally triggered.
  • the non-access stratum message sent by the terminal includes the first identifier information of the initial PDU session. And the second identifier information that is allocated by the terminal to the new PDU session, so that the AMF can select the old SMF, that is, the SMF corresponding to the first identifier information, according to the first identifier information of the initial PDU session.
  • Step 102 Send a session management request to the session management function entity SMF corresponding to the first identifier information, where the session management request carries the first identifier information and the second identifier information, where the session management request is used to enable the SMF according to the The first identification information and the second identification information establish the new PDU session.
  • SMF selection is done by AMF.
  • the UE allocates a PDU session ID for different PDU sessions.
  • the non-access stratum message sent by the UE to the AMF includes: Single-network slice selection assistance information (S-NSSAI), PDU session ID (PDU Session ID), N1 SM information: N1 interface is transmitted to the SMF
  • S-NSSAI Single-network slice selection assistance information
  • PDU Session ID PDU Session ID
  • N1 SM information N1 interface is transmitted to the SMF
  • the message, that is, the session management message delivered to the SMF, the specific format is as follows:
  • NAS Message (S-NSSAI, DNN, PDU Session ID, N1 SM information).
  • AMF only parses S-NSSAI, DNN, PDU Session ID, and does not parse N1 SM information.
  • S-NSSAI, DNN, PDU Session ID is used by the AMF to perform SMF selection.
  • the AMF receives the NAS message, it selects the routed SMF information according to the PDU session ID. If the PDU session is previously established, the AMF retains the association between the PDU session ID and the SMF ID. After the subsequent AMF receives the session management non-access stratum message (SM NAS message) related to the PDU session ID, the AMF directly delivers the SM NAS message to the SMF for processing.
  • SM NAS message session management non-access stratum message
  • the initiated NAS message is a request to create a new PDU session
  • the SMF needs to select a new SMF ID for the PDU session based on the S-NSSAI, DNN, etc., and save the association between the PDU session ID and the SMF ID.
  • the terminal when the terminal sends a non-access stratum message requesting to establish a new PDU session to the AMF, the first identifier information of the initial PDU session and the second identifier information allocated by the terminal for the new PDU session are carried.
  • the AMF may select an SMF corresponding to the first identification information according to the non-access stratum message, so that the new PDU session and the initial PDU session are connected to the same SMF.
  • step 102 may specifically include steps 1021 to 1023.
  • Step 1021 Parse the non-access stratum message to obtain the first identifier information.
  • the non-access stratum message may be specifically a PDU session establishment request, and the PDU session identification information of the PDU session establishment request carries the first identifier information, and the N1 session management message of the PDU session establishment request is carried in the N1 session management message. There is the second identification information.
  • the AMF parses the PDU session identification information in the PDU session establishment request to obtain the first identifier information.
  • the foregoing NAS message is a PDU session reestablishment request
  • the PDU session identification information of the PDU session reestablishment request carries the first identifier information and the second identifier information.
  • the AMF parses the PDU session identification information of the PDU session reestablishment request to obtain the first identifier information and the second identifier information.
  • the first identifier information may be carried in the PDU session identifier information of the PDU session establishment request, and the second identifier information is carried in the N1 session management message of the PDU session establishment request;
  • the PDU session identification information of the session reestablishment request carries the first identifier information and the second identifier information, so that the AMF parses the AMF non-access stratum message in the PDU session establishment request or the PDU session reestablishment request to obtain the first identifier information.
  • a new PDU session can be selected to the SMF to which the initial PDU session is connected.
  • Step 1022 Acquire SMF identification information corresponding to the first identifier information according to the correspondence between the pre-stored PDU session identifier information and the SMF identifier information.
  • the association relationship between the PDU session ID and the SMF ID is retained in the AMF, and the AMF can select the SMF identification information corresponding to the initial PDU session according to the association relationship, so as to subsequently send the session management request to the corresponding
  • the SMF enables the SMF to establish a new PDU session.
  • Step 1023 Send the session management request to the SMF corresponding to the SMF identification information.
  • the session management request is sent to the SMF corresponding to the SMF identification information, and the SMF that sends the notification message SMF to the terminal and establishes a new PDU session is the same SMF.
  • the SMF corresponding to the SMF identification information establishes a new PDU session according to the first identification information and the second identification information.
  • the method for session reconstruction in the embodiment of the present disclosure further includes:
  • the second identification information sent by the SMF and the identification information of the SMF are obtained, and are saved according to the corresponding relationship.
  • the second identifier information and the identifier information of the SMF are sent to the AMF, so that the subsequent AMF according to the second identifier information and the identifier information of the SMF,
  • the session management information related to the second identification information is sent to the SMF.
  • the AMF obtains the NAS message sent by the terminal, and the non-access stratum message is used to request to establish a new PDU session connected to the same data network with the initial PDU session, where the NAS message carries the initial PDU.
  • further embodiments of the present disclosure further provide a method for session reestablishment, which is applied to a session management function entity SMF, including steps 201 to 203.
  • Step 201 Send a notification message for re-establishing a PDU session to the terminal.
  • the SMF decides that the UPF of the service needs to be re-established, and then the SMF sends a notification message to the UE, informing the UE that the initial PDU session will be deleted for a period of time and requesting the UE to establish a new PDU session to the same data network.
  • the notification message contains the identification information of the initial PDU session and the timer value that the network wishes to reserve the initial PDU session.
  • Step 202 Acquire a session management request sent by the AMF, where the session management request is sent after the AMF receives the NAS message sent by the terminal according to the notification message, and the NAS message and the session management request are carried by First identification information of the initial PDU session and second identification information of the new PDU session, and the SMF is an SMF corresponding to the first identification information, and the initial PDU session is connected to the same data as the new PDU session The internet.
  • the AMF After receiving the NAS message that is sent by the terminal and carrying the first identifier information and the second identifier information, the AMF parses the NAS message to obtain the first identifier information, and sends a session management request to the SMF corresponding to the first identifier information. Connect the new PDU session to the same SMF as the initial PDU session.
  • Step 203 Establish the new PDU session according to the first identifier information and the second identifier information.
  • This step 203 may specifically include steps 2031 and 2032.
  • Step 2031 Select a new user plane anchor UPF for the new PDU session according to the first identifier information and the second identifier information.
  • the new user plane anchor point is different from the user plane anchor point corresponding to the initial PDU session. Since the session management request carries the first identifier information and the second identifier information, the SMF selects the user plane anchor point selection for the new PDU session. A new user plane anchor different from the user plane anchor corresponding to the first identification information may be selected, thereby effectively avoiding selecting two sessions to the same user anchor point.
  • Step 2032 Establish a connection of the N4 interface with the new UPF, and establish a connection between the air interface and the N3 user plane for the new UPF.
  • the initial PDU session may be deleted by the UE, or may be deleted by the SMF after the timer expires.
  • the method further includes:
  • the second identifier information and the identifier information of the SMF are sent to the AMF, so that the subsequent AMF according to the second identifier information and the identifier information of the SMF,
  • the session management information related to the second identification information is sent to the SMF.
  • the SMF sends a notification message for re-establishing a PDU session to the terminal; acquiring a session management request sent by the AMF; and establishing the new according to the first identifier information and the second identifier information in the session management request.
  • the PDU session ensures that the new PDU session and the initial PDU session are connected to the same SMF, thereby effectively ensuring the continuity of the session.
  • another embodiment of the present disclosure further provides a method for session reconstruction, which is applied to a terminal, including:
  • Step 301 Send a NAS message to the AMF according to the notification message of re-establishing the PDU session sent by the session management function entity SMF, where the NAS message is used to request to establish a new PDU session connected to the same data network with the initial PDU session.
  • the non-access stratum message carries the first identifier information of the initial PDU session and the second identifier information of the new PDU session, where the NAS message is used to send the AMF to the SMF corresponding to the first identifier information.
  • a session management request carrying the first identifier information and the second identifier information, where the session management request is used to enable the SMF to establish the new PDU session according to the first identifier information and the second identifier information.
  • the terminal establishes a new PDU session according to the foregoing notification message, and allocates new session identification information, that is, the foregoing second identification information, to the new PDU session.
  • the non-access stratum message sent by the terminal to establish a new PDU session is different from the NAS message that is normally triggered.
  • the non-access stratum message sent by the terminal includes the first identifier information of the initial PDU session.
  • the second identifier information that is allocated by the terminal to the new PDU session, so that the AMF can select the old SMF, that is, the SMF corresponding to the first identifier information, according to the first identifier information of the initial PDU session.
  • the sending the non-access stratum message to the AMF includes:
  • the first identifier information is added to the PDU session identifier information of the PDU session establishment request, and the second identifier information is added to the N1 session management message of the PDU session establishment request, and is sent to the AMF.
  • the terminal sends a NAS message to the AMF according to the notification message of re-establishing the PDU session sent by the session management function entity SMF; the AMF sends the NAS message carrying the initial PDU session to the SMF according to the NAS message sent by the terminal.
  • the embodiment of the present disclosure achieves the purpose of connecting the new PDU session to the SMF selected by the initial PDU session by carrying the first identifier information and the second identifier information in the non-access stratum message and the session management request, which effectively guarantees The continuity of the conversation.
  • the non-access stratum message sent by the terminal in the embodiment of the present disclosure is a PDU session establishment request.
  • the session re-establishment implementation process of some embodiments of the present disclosure is described below with reference to FIG. 4 .
  • the implementation process includes steps 401 to 406.
  • Step 401 The terminal sends a PDU session establishment request to the AMF, where the PDU session establishment request carries the first identifier information of the initial PDU session and the second identifier information that the terminal allocates for the new PDU session.
  • the PDU session establishment request is sent to the AMF after the terminal receives the notification message for re-establishing the PDU session sent by the SMF, and the format of the PDU session establishment request is specifically: (PDU session ID1, N1 SM information (PDU session ID2))
  • PDU session ID1 is the first identification information of the initial session
  • PDU session ID2 is the second identification information of the new PDU session.
  • the second identification information is transparently transmitted to the SMF in the SM information.
  • the PDU session establishment request may also include information such as S-NSSAI, DN, and the like.
  • Step 402 The AMF selects an SMF according to the first identifier information of the PDU session establishment request, and sends a bearer session management request to the selected SMF, where the session management request carries the first identifier information and the second identifier information.
  • the PDU session identification information in the PDU session establishment request is parsed to obtain the first identifier information, and the first relationship is obtained according to the correspondence between the pre-stored PDU session identifier information and the SMF identifier information. And identifying the SMF identification information corresponding to the information; and sending the session management request to the SMF corresponding to the SMF identification information.
  • the format of the SMF sending session management request may be specifically: (PDU session ID1, N1 SM information (PDU session ID2)).
  • Step 403 The SMF selects a new UPF according to the first identifier information and the second identifier information, and initiates an establishment process of the N4 interface.
  • Step 404 The UPF returns an establishment response of the N4 interface to the SMF.
  • Step 405 The SMF establishes an air interface and an N3 user plane connection process for the new PDU session.
  • Step 406 After the new PDU session is established, the SMF sends the second identification information and the SMF identification information to the AMF.
  • the AMF saves the association relationship between the second identification information and the SMF identification information.
  • the AMF routes the NAS message to the SMF.
  • the UE when the UE receives the PDU session triggered by the network to establish a new SSC mode 3, the UE still reuses the PDU session establishment request message.
  • the PDU session ID that the AMF parses in the message still carries the first identification information of the initial PDU session.
  • the AMF sends a session management request to the SMF corresponding to the first identifier information, where the session management request carries the first identifier information and the second identifier information;
  • the SMF establishes a new PDU session according to the first identification information and the second identification information, and achieves the purpose of connecting the new PDU session to the SMF selected by the initial PDU session, thereby effectively ensuring continuity of the session.
  • the non-access stratum message sent by the terminal in the embodiment of the present disclosure is a redefined PDU session reestablishment request, where the PDU session reestablishment request carries the first identification information of the initial PDU session and the second allocation by the terminal for the new PDU session.
  • Identification information a session reconstruction implementation flow of other embodiments of the present disclosure is described below in conjunction with FIG. 5.
  • the implementation process includes steps 501 to 506.
  • Step 501 The terminal sends a PDU session reestablishment request to the AMF, where the PDU session reestablishment request carries the first identifier information of the initial PDU session and the second identifier information that the terminal allocates for the new PDU session.
  • the PDU session reestablishment request is sent by the terminal to the AMF after receiving the notification message of re-establishing the PDU session sent by the SMF, and the format of the PDU session reestablishment request is specifically: (PDU session ID1, PDU session ID2), wherein the PDU session ID1 is the first identification information of the initial session, and the PDU session ID2 is the second identification information of the new PDU session.
  • the first identification information and the second identification information are in the PDU session identification information of the PDU session reestablishment request.
  • Step 502 The AMF selects an SMF according to the first identifier information of the PDU session reestablishment request, and sends a bearer session management request to the selected SMF, where the session management request carries the first identifier information and the second identifier information.
  • the format of the SMF sending session management request may be specifically: (PDU session ID1, PDU session ID2).
  • Step 503 The SMF selects a new UPF according to the first identifier information and the second identifier information, and initiates an establishment process of the N4 interface.
  • Step 504 The UPF returns an establishment response of the N4 interface to the SMF.
  • Step 505 The SMF establishes an air interface and an N3 user plane connection process for the new PDU session.
  • Step 506 After the new PDU session is established, the SMF sends the second identification information and the SMF identification information to the AMF.
  • the AMF saves the association relationship between the second identification information and the SMF identification information.
  • the AMF routes the NAS message to the SMF.
  • the method for session reconstruction of the embodiment of the present disclosure defines a new NAS message for initiating a setup request for a new PDU session.
  • the new NAS message is specifically a PDU session reestablishment request, where the PDU session reestablishment request carries the first identification information of the initial PDU session and the second identification information allocated by the new PDU session; the AMF sends a session to the SMF corresponding to the first identification information.
  • a management request the session management request carries the first identification information and the second identification information; the SMF establishes a new PDU session according to the first identification information and the second identification information, and implements the SMF selected by connecting the new PDU session to the initial PDU session. The purpose of this is to ensure the continuity of the session.
  • some embodiments of the present disclosure further provide an apparatus for session reestablishment, which is applied to an access and mobility management function entity AMF, including:
  • the first obtaining module 601 is configured to acquire a non-access stratum NAS message sent by the terminal, where the non-access stratum message is used to request to establish a new PDU session that is connected to the same data network as the initial PDU session, where the NAS message carries First identification information of the initial PDU session and second identification information allocated by the terminal for the new PDU session;
  • the first sending module 602 is configured to send a session management request to the session management function entity SMF corresponding to the first identifier information, where the session management request carries the first identifier information and the second identifier information, where the session The management request is used to enable the SMF to establish the new PDU session according to the first identification information and the second identification information.
  • the first sending module 602 includes:
  • the parsing sub-module 6021 is configured to parse the NAS message to obtain the first identifier information.
  • the obtaining sub-module 6022 is configured to acquire the SMF identification information corresponding to the first identifier information according to the correspondence between the pre-stored PDU session identifier information and the SMF identifier information.
  • the sending submodule 6023 is configured to send the session management request to the SMF corresponding to the SMF identification information.
  • the non-access stratum message is a PDU session establishment request
  • the PDU session identification information of the PDU session establishment request carries the first identifier information
  • the PDU session establishment request The N1 session management message carries the second identifier information
  • the parsing sub-module 6021 is configured to parse the PDU session identification information in the PDU session establishment request to obtain the first identifier information.
  • the NAS message is a PDU session re-establishment request
  • the PDU session identification information of the PDU session re-establishment request carries the first identifier information and the second identifier information
  • the parsing sub-module 6021 is configured to parse the PDU session identification information of the PDU session reestablishment request to obtain the first identifier information and the second identifier information.
  • the second obtaining module 603 is configured to obtain the second identifier information sent by the SMF and the identifier information of the SMF, and save the information according to the corresponding relationship.
  • the device for reestablishing the session is the device corresponding to the method in the first embodiment. All the implementations in the foregoing first embodiment are applicable to the embodiment of the device, and the same technical effects can be achieved.
  • the apparatus for session reconstruction of the embodiment of the present disclosure acquires a NAS message sent by a terminal, where the non-access stratum message is used to request to establish a new PDU session connected to the same data network with an initial PDU session, where the NAS message carries an initial PDU session.
  • the first identifier information and the second identifier information that is allocated by the terminal to the new PDU session; and the session management function entity SMF corresponding to the first identifier information is sent a session management request, where the session management request carries the first identifier information and a second identifier information, the session management request is used to enable the SMF to establish the new PDU session according to the first identifier information and the second identifier information, to achieve the purpose of connecting the new PDU session and the initial PDU session to the same SMF, thereby effectively ensuring The continuity of the conversation.
  • some embodiments of the present disclosure further provide an access and mobility management function entity, as shown in FIG. 7, including a first memory 701, a first processor 702, and being stored on the first memory 701 and A computer program running on the first processor 702, the steps in the method of implementing the session reconstruction described in the first embodiment when the first processor executes the computer program.
  • a first acquiring module configured to acquire a non-access stratum NAS message sent by the terminal, where the non-access stratum message is used to request to establish a new PDU session that is connected to the same data network as the initial PDU session, where the NAS message carries First identification information of the initial PDU session and second identification information that is allocated by the terminal to the new PDU session;
  • a first sending module configured to send a session management request to the session management function entity SMF corresponding to the first identifier information, where the session management request carries the first identifier information and the second identifier information, where the session management The request is used to enable the SMF to establish the new PDU session according to the first identifier information and the second identifier information.
  • the first processor 702 is configured to read a program in the first memory, and perform the following process: acquiring a non-access stratum NAS message sent by the terminal, where the non-access stratum message is used to request to establish a connection with the initial PDU session. a new PDU session of the data network, the NAS message carrying first identification information of an initial PDU session and second identification information allocated by the terminal for the new PDU session; session management corresponding to the first identification information
  • the function entity SMF sends a session management request, where the session management request carries the first identifier information and the second identifier information, where the session management request is used to make the SMF according to the first identifier information and the second The identification information establishes the new PDU session.
  • an embodiment of the present disclosure further provides a computer readable storage medium having stored thereon a computer program, wherein the computer program causes the computer to perform the following steps: acquiring a non-access stratum NAS message sent by the terminal, the non- The access layer message is used to request to establish a new PDU session that is connected to the same data network as the initial PDU session, the NAS message carrying the first identification information of the initial PDU session and the first allocation by the terminal for the new PDU session.
  • the AMF of the embodiment of the present disclosure acquires a NAS message sent by the terminal, and the non-access stratum message is used to request to establish a new PDU session that is connected to the same data network as the initial PDU session, where the NAS message carries the first PDU session.
  • the identifier information and the second identifier information that is allocated by the terminal to the new PDU session sending a session management request to the session management function entity SMF corresponding to the first identifier information, where the session management request carries the first identifier information and the second identifier
  • the session management request is used to enable the SMF to establish the new PDU session according to the first identifier information and the second identifier information, to achieve the purpose of connecting the new PDU session and the initial PDU session to the same SMF, thereby effectively ensuring continuity of the session. Sex.
  • another embodiment of the present disclosure further provides an apparatus for session reestablishment, which is applied to a session management function entity SMF, including:
  • a second sending module 801 configured to send, to the terminal, a notification message for re-establishing a PDU session
  • the third obtaining module 802 is configured to obtain a session management request sent by the AMF, where the session management request is sent by the AMF after receiving the NAS message sent by the terminal according to the notification message, and the NAS message and the session are sent.
  • the management request carries the first identification information of the initial PDU session and the second identification information of the new PDU session, and the SMF is an SMF corresponding to the first identification information, and the initial PDU session is in conversation with the new PDU. Connect to the same data network;
  • the establishing module 803 is configured to establish the new PDU session according to the first identifier information and the second identifier information.
  • the establishing module 803 includes:
  • a sub-module 8031 configured to select a new user plane anchor UPF for the new PDU session according to the first identifier information and the second identifier information;
  • the sub-module 8032 is configured to establish a connection of the N4 interface with the new UPF, and establish a connection between the air interface and the N3 user plane for the new UPF.
  • the third sending module 804 is configured to establish a correspondence between the second identifier information and the identifier information of the SMF, and send the second identifier information and the identifier information of the SMF to the AMF.
  • the device for reestablishing the session is the device corresponding to the method in the embodiment corresponding to FIG. 2, and all the implementation manners in the corresponding embodiment of FIG. 2 are applicable to the embodiment of the device, and can also achieve the same. Technical effect.
  • the apparatus for session reconstruction of the embodiment of the present disclosure sends a notification message for re-establishing a PDU session to the terminal; acquiring a session management request sent by the AMF; and establishing the new PDU according to the first identifier information and the second identifier information in the session management request.
  • the session ensures that the new PDU session and the initial PDU session are connected to the same SMF, thereby effectively ensuring the continuity of the session.
  • some embodiments of the present disclosure further provide a session management function entity SMF, including a second memory 901, a second processor 902, and a second memory 901 and may be in the second A computer program running on the processor 902, the second processor 902 executing the computer program to implement the steps in the method of session reconstruction described in the embodiment corresponding to FIG. 2.
  • SMF session management function entity
  • a second sending module configured to send, to the terminal, a notification message for re-establishing a PDU session
  • a third acquiring module configured to acquire a session management request sent by the AMF, where the session management request is sent by the AMF after receiving the NAS message sent by the terminal according to the notification message, and the NAS message and the session management
  • the request carries the first identification information of the initial PDU session and the second identification information of the new PDU session
  • the SMF is an SMF corresponding to the first identification information
  • the initial PDU session is connected to the new PDU session.
  • a establishing module configured to establish the new PDU session according to the first identifier information and the second identifier information.
  • the second processor 902 is configured to read a program in the second memory, and execute the following process: sending a notification message for re-establishing the PDU session to the terminal; acquiring a session management request sent by the AMF, where the session management request is received by the AMF After the terminal sends the NAS message according to the notification message, the NAS message and the session management request both carry the first identification information of the initial PDU session and the second identification information of the new PDU session, and the SMF And the initial PDU session is connected to the same data network as the SMF corresponding to the first identifier information; and the new PDU is established according to the first identifier information and the second identifier information. Conversation.
  • some embodiments of the present disclosure also provide a computer readable storage medium having stored thereon a computer program, wherein the computer program causes a computer to perform the following steps: transmitting a notification message to a terminal to re-establish a PDU session; acquiring an AMF a session management request sent, the session management request is sent after the AMF receives the NAS message sent by the terminal according to the notification message, and the NAS message and the session management request both carry an initial PDU session.
  • An identification information and second identification information of a new PDU session and the SMF is an SMF corresponding to the first identification information, and the initial PDU session is connected to the same data network as the new PDU session; The first identification information and the second identification information establish the new PDU session.
  • the session management function entity of the embodiment of the present disclosure sends a notification message for re-establishing a PDU session to the terminal; acquiring a session management request sent by the AMF; and establishing the new PDU according to the first identifier information and the second identifier information in the session management request.
  • the session ensures that the new PDU session and the initial PDU session are connected to the same SMF, thereby effectively ensuring the continuity of the session.
  • another embodiment of the present disclosure further provides a device for session reconstruction, which is applied to a terminal, and includes:
  • the fourth sending module 1001 is configured to send a NAS message to the AMF according to the notification message of re-establishing the PDU session sent by the session management function entity SMF, where the NAS message is used to request to establish a new connection with the initial PDU session to the same data network.
  • a PDU session where the non-access stratum message carries first identification information of an initial PDU session and second identification information of the new PDU session, where the NAS message is used to make the AMF and the first identification information
  • Corresponding SMF sending a session management request carrying the first identifier information and the second identifier information, where the session management request is used to enable the SMF to establish a location according to the first identifier information and the second identifier information Describe the new PDU session.
  • the fourth sending module is configured to add the first identifier information in the PDU session identifier information of the PDU session establishment request, in the N1 session management message of the PDU session establishment request The second identification information is added and sent to the AMF.
  • the terminal is a device corresponding to the method in the embodiment corresponding to FIG. 3. All the implementation manners in the foregoing embodiment of FIG. 3 are applicable to the embodiment of the terminal, and the same technical effect can be achieved. .
  • the terminal of the embodiment of the present disclosure sends a NAS message to the AMF according to the notification message of re-establishing the PDU session sent by the session management function entity SMF.
  • the AMF sends the first identifier information carrying the initial PDU session to the SMF according to the NAS message sent by the terminal.
  • a session management request for the second identification information of the new PDU session the SMF establishes a new PDU session according to the first identification information and the second identification information.
  • the embodiment of the present disclosure achieves the purpose of connecting the new PDU session to the SMF selected by the initial PDU session by carrying the first identifier information and the second identifier information in the non-access stratum message and the session management request, which effectively guarantees The continuity of the conversation.
  • some embodiments of the present disclosure further provide a terminal, where the terminal includes: a third processor 1100; and is connected to the third processor 1100 through a bus interface. a third memory 1120; a computer program stored on the third memory 1120 and operable on the third processor 1100, and a transceiver 1110 connected to the third processor 1100 via a bus interface; the third memory is used for Storing a program and data used by the third processor in performing an operation; receiving a downlink control channel through the transceiver 1110; and invoking and executing a program stored in the third memory 1120 and a third processor 1100
  • the terminal includes: a third processor 1100; and is connected to the third processor 1100 through a bus interface.
  • a third memory 1120 a computer program stored on the third memory 1120 and operable on the third processor 1100, and a transceiver 1110 connected to the third processor 1100 via a bus interface;
  • the third memory is used for Storing a program and data used by the third processor in performing
  • a fourth sending module configured to send a NAS message to the AMF according to the notification message of re-establishing the PDU session sent by the session management function entity SMF, where the NAS message is used to request to establish a new PDU connected to the same data network as the initial PDU session.
  • a session the non-access stratum message carrying the first identifier information of the initial PDU session and the second identifier information of the new PDU session, where the NAS message is used to make the AMF correspond to the first identifier information
  • the SMF the session management request carrying the first identifier information and the second identifier information, where the session management request is used to enable the SMF to establish the foregoing according to the first identifier information and the second identifier information New PDU session.
  • the third processor 1100 is configured to read the program in the third memory 1120, and perform the following process: sending a NAS message to the AMF through the transceiver 1110 according to the notification message of the re-establishment PDU session sent by the session management function entity SMF, the NAS The message is used to request to establish a new PDU session that is connected to the same data network as the initial PDU session, where the non-access stratum message carries the first identification information of the initial PDU session and the second identification information of the new PDU session.
  • the NAS message is used to send the AMF to the SMF corresponding to the first identifier information, and send a session management request carrying the first identifier information and the second identifier information, where the session management request is used to enable the The SMF establishes the new PDU session area according to the first identification information and the second identification information.
  • the transceiver 1110 is configured to receive and transmit data under the control of the third processor 1100.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by the third processor 1100 and various circuits of the memory represented by the third memory 1120. .
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • the transceiver 1110 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the user interface 1130 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the third processor 1100 is responsible for managing the bus architecture and general processing, and the third memory 1120 can store data used by the third processor 1100 when performing operations.
  • some embodiments of the present disclosure also provide a computer readable storage medium having stored thereon a computer program, wherein the computer program causes a computer to perform the following steps: re-establishing a PDU session according to a session management function entity SMF Notifying the message, sending a NAS message to the AMF, the NAS message being used to request to establish a new PDU session connected to the same data network with the initial PDU session, the NAS message carrying the first identification information of the initial PDU session and the new a second identifier information of the PDU session, where the NAS message is used to send the AMF to the SMF corresponding to the first identifier information, and send a session management request that carries the first identifier information and the second identifier information, where The session management request is used to enable the SMF to establish the new PDU session according to the first identification information and the second identification information.
  • the third processor 1100 is configured to send a NAS message to the AMF according to the notification message of re-establishing the PDU session sent by the session management function entity SMF; the AMF sends the initial message to the SMF according to the NAS message sent by the terminal.
  • the embodiment of the present disclosure achieves the purpose of connecting the new PDU session to the SMF selected by the initial PDU session by carrying the first identifier information and the second identifier information in the non-access stratum message and the session management request, which effectively guarantees The continuity of the conversation.

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Abstract

一种会话重建的方法、装置、AMF、SMF及终端。该方法包括：AMF获取终端发送的NAS消息，NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，NAS消息携带有初始PDU会话的第一标识信息及新PDU会话分配的第二标识信息；向与第一标识信息对应的SMF发送会话管理请求，会话管理请求携带有第一标识信息和第二标识信息，会话管理请求用于使SMF根据第一标识信息和第二标识信息建立新PDU会话。该方法实现了将新PDU会话连接到初始PDU会话所选择的SMF中的目的。

Description

会话重建的方法和装置、访问和移动性管理功能实体、会话管理功能实体及终端
相关申请的交叉引用
本申请主张在2017年3月17日在中国提交的中国专利申请号No.201710159751.1的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及通信应用的技术领域，尤其涉及一种会话重建的方法和装置、访问和移动性管理功能实体AMF、会话管理功能实体SMF及终端。
背景技术
Next Gen系统对分组数据单元(packet data unit，PDU)会话session要支持多种连续性的需求。对此，目前的研究报告(Technical Report，TR)中定义了三种业务和会话连续性(service and session continuity，SSC)模式。
SSC模式1是指为这一PDU会话分配一个用户面锚点(User Plane Function，UPF)，这一用户面锚点在整个PDU会话的存活期内都要保持不变。
SSC模式2是指为这一PDU会话分配的UPF只能在一定的服务区域内保持，当用户设备(User Equipment，UE移除了这一UPF的服务区域时，UE需要选择新的UPF。
SSC模式3是指之前选择了一UPF，建立到一个数据网络的PDU会话。UE到这一UPF的连接中止之前，又建立了一个新的到相同的数据网络的PDU会话，并且为这一新的PDU会话选择了一个新的UPF。UE可以将数据流转移到新的PDU会话上，随后删除之前的PDU会话连接。
对于SSC模式3的PDU会话，当目前的PDU会话路径不是最优路径，或者当前的PDU会话将要不能保持时，网络可以通知UE新建一条到同一数据网络的PDU会话。新建立的PDU会话与旧的PDU会话要选择到相同的会话管理功能实体(Session Management Function，SMF)，目前为PDU会话选择SMF是由访问和移动性管理功能实体(Access and Mobility Management Function，AMF)来完成的，目前的机制无法保证AMF能将两条到同一数据 网络的SSC模式3的PDU会话选择到相同的AMF中。
发明内容
本公开提供了一种会话重建的方法和装置、访问和移动性管理功能实体AMF、会话管理功能实体SMF及终端，用以解决目前的机制无法保证AMF将两条到同一数据网络的PDU会话选择到相同的SMF中的问题。
为了实现上述目的，本公开的实施例提供了一种会话重建的方法，应用于访问和移动性管理功能实体AMF，包括：
获取终端发送的非接入层NAS消息，所述NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述NAS消息携带有初始PDU会话的第一标识信息及所述终端为所述新PDU会话分配的第二标识信息；
向与所述第一标识信息对应的会话管理功能实体SMF发送会话管理请求，所述会话管理请求携带有所述第一标识信息和第二标识信息，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
可选地，所述向与所述第一标识信息对应的会话管理功能实体SMF发送会话管理请求的步骤，包括：
对所述NAS消息进行解析，得到所述第一标识信息；
根据预先保存的PDU会话标识信息与SMF标识信息的对应关系，获取与所述第一标识信息对应的SMF标识信息；
将所述会话管理请求发送给所述SMF标识信息对应的SMF。
可选地，所述NAS消息为PDU会话建立请求，所述PDU会话建立请求的PDU会话标识信息中携带有所述第一标识信息，所述PDU会话建立请求的N1会话管理消息中携带有所述第二标识信息；
所述对所述NAS消息进行解析，得到所述第一标识信息的步骤，包括：
对所述PDU会话建立请求中的PDU会话标识信息进行解析处理，得到所述第一标识信息。
所述NAS消息为PDU会话重建请求，所述PDU会话重建请求的PDU 会话标识信息中携带有所述第一标识信息和所述第二标识信息；
所述对所述NAS消息进行解析，得到所述第一标识信息的步骤，包括：
对所述PDU会话重建请求的PDU会话标识信息进行解析处理，得到所述第一标识信息和所述第二标识信息。
可选地，上述会话重建的方法，还包括：
获取SMF发送的第二标识信息和SMF的标识信息，并按照对应关系进行保存。
为了实现上述目的，本公开的实施例还提供了一种会话重建的装置，应用于访问和移动性管理功能实体AMF，包括：
第一获取模块，用于获取终端发送的非接入层NAS消息，所述NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述NAS消息携带有初始PDU会话的第一标识信息及所述终端为所述新PDU会话分配的第二标识信息；
第一发送模块，用于向与所述第一标识信息对应的会话管理功能实体SMF发送会话管理请求，所述会话管理请求携带有所述第一标识信息和第二标识信息，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
可选地，所述第一发送模块包括：
解析子模块，用于对所述NAS消息进行解析，得到所述第一标识信息；
获取子模块，用于根据预先保存的PDU会话标识信息与SMF标识信息的对应关系，获取与所述第一标识信息对应的SMF标识信息；
发送子模块，用于将所述会话管理请求发送给所述SMF标识信息对应的SMF。
可选地，所述NAS消息为PDU会话建立请求，所述PDU会话建立请求的PDU会话标识信息中携带有所述第一标识信息，所述PDU会话建立请求的N1会话管理消息中携带有所述第二标识信息；
所述解析子模块用于对所述PDU会话建立请求中的PDU会话标识信息进行解析处理，得到所述第一标识信息。
可选地，所述NAS消息为PDU会话重建请求，所述PDU会话重建请求 的PDU会话标识信息中携带有所述第一标识信息和所述第二标识信息；
所述解析子模块用于对所述PDU会话重建请求的PDU会话标识信息进行解析处理，得到所述第一标识信息和所述第二标识信息。
可选地，上述会话重建的装置，还包括：
第二获取模块，用于获取SMF发送的第二标识信息和SMF的标识信息，并按照对应关系进行保存。
为了实现上述目的，本公开的实施例还提供了一种访问和移动性管理功能实体AMF，包括第一存储器、第一处理器及存储在第一存储器上并可在第一处理器上运行的计算机程序，所述第一处理器执行所述计算机程序时实现如上所述的会话重建的方法中的步骤。
为了实现上述目的，本公开的实施例还提供了一种会话重建的方法，应用于会话管理功能实体SMF，包括：
向终端发送重新建立PDU会话的通知消息；
获取AMF发送的会话管理请求，所述会话管理请求为所述AMF接收到终端根据所述通知消息发送的NAS消息后发送的，且所述NAS消息和所述会话管理请求均携带有初始PDU会话的第一标识信息及新PDU会话的第二标识信息，且所述SMF为与所述第一标识信息对应的SMF，所述初始PDU会话与所述新PDU会话连接到相同的数据网络；
根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话。
可选地，所述根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话的步骤，包括：
根据所述第一标识信息和所述第二标识信息，为所述新PDU会话选择新的用户面锚点UPF；
与所述新的UPF建立N4接口的连接，并为所述新的UPF建立空口和N3用户面的连接。
可选地，根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话的步骤之后，还包括：
建立所述第二标识信息和SMF的标识信息的对应关系，并将所述第二标识信息和SMF的标识信息发送给所述AMF。
为了实现上述目的，本公开的实施例还提供了一种会话重建的装置，应用于会话管理功能实体SMF，包括：
第二发送模块，用于向终端发送重新建立PDU会话的通知消息；
第三获取模块，用于获取AMF发送的会话管理请求，所述会话管理请求为所述AMF接收到终端根据所述通知消息发送的NAS消息后发送的，且所述NAS消息和所述会话管理请求均携带有初始PDU会话的第一标识信息及新PDU会话的第二标识信息，且所述SMF为与所述第一标识信息对应的SMF，所述初始PDU会话与所述新PDU会话连接到相同的数据网络；
建立模块，用于根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话。
可选地，所述建立模块包括：
选择子模块，用于根据所述第一标识信息和所述第二标识信息，为所述新PDU会话选择新的用户面锚点UPF；
建立子模块，用于与所述新的UPF建立N4接口的连接，并为所述新的UPF建立空口和N3用户面的连接。
可选地，上述会话重建的装置，还包括：
第三发送模块，用于建立所述第二标识信息和SMF的标识信息的对应关系，并将所述第二标识信息和SMF的标识信息发送给所述AMF。
为了实现上述目的，本公开的实施例还提供了一种会话管理功能实体SMF，包括第二存储器、第二处理器及存储在第二存储器上并可在第二处理器上运行的计算机程序，所述第二处理器执行所述计算机程序时实现所述会话管理功能实体SMF在所述的会话重建的方法中执行的步骤。
为了实现上述目的，本公开的实施例还提供了一种会话重建的方法，应用于终端，包括：
根据会话管理功能实体SMF发送的重新建立PDU会话的通知消息，向AMF发送NAS消息，所述NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述NAS消息携带有初始PDU会话的第一标识信息及所述新PDU会话的第二标识信息，所述NAS消息用于使所述AMF向与所述第一标识信息对应的SMF，发送携带有所述第一标识信息和第 二标识信息的会话管理请求，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
可选地，所述向AMF发送非接入层消息包括：
在PDU会话建立请求的PDU会话标识信息中添加所述第一标识信息，在所述PDU会话建立请求的N1会话管理消息中添加所述第二标识信息，并发送给所述AMF。
为了实现上述目的，本公开的实施例还提供了一种会话重建的装置，应用于终端，包括：
第四发送模块，用于根据会话管理功能实体SMF发送的重新建立PDU会话的通知消息，向AMF发送NAS消息，所述NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述NAS消息携带有初始PDU会话的第一标识信息及所述新PDU会话的第二标识信息，所述NAS消息用于使所述AMF向与所述第一标识信息对应的SMF，发送携带有所述第一标识信息和第二标识信息的会话管理请求，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
可选地，所述第四发送模块用于在PDU会话建立请求的PDU会话标识信息中添加所述第一标识信息，在所述PDU会话建立请求的N1会话管理消息中添加所述第二标识信息，并发送给所述AMF。
为了实现上述目的，本公开的实施例还提供了一种终端，包括第三存储器、第三处理器及存储在第三存储器上并可在第三处理器上运行的计算机程序，所述第三处理器执行所述计算机程序时实现所述终端在上述会话重建的方法中执行的步骤。
为了实现上述目的，本公开的实施例还提供了一种计算机可读存储介质，其上存储有计算机程序，其中，当所述计算机程序被处理器执行时，实现所述访问和移动性管理功能实体AMF在上述会话重建的方法中执行的步骤。
为了实现上述目的，本公开的实施例还提供了一种计算机可读存储介质，其上存储有计算机程序，其中，当所述计算机程序被处理器执行时，实现所述会话管理功能实体SMF在上述会话重建的方法中执行的步骤。
为了实现上述目的，本公开的实施例还提供了一种计算机可读存储介质， 其上存储有计算机程序，其中，当所述计算机程序被处理器执行时，实现所述终端在上述会话重建的方法中执行的步骤。
本公开在本公开实施例的上述技术方案中，SMF向终端发送重新建立PDU会话的通知消息；终端根据通知消息向AMF发送非接入层消息，该非接入层消息携带有初始PDU会话的第一标识信息及终端为新PDU会话分配的第二标识信息；AMF向与第一标识信息对应的SMF发送会话管理请求，该会话管理请求携带有第一标识信息和第二标识信息；SMF根据第一标识信息和第二标识信息建立新PDU会话。本公开实施例通过在上述非接入层消息和会话管理请求中携带第一标识信息和第二标识信息，实现了将新PDU会话连接到初始PDU会话所选择的SMF中的目的。
附图说明
图1为本公开的一些实施例的会话重建的方法的工作流程图；
图2为本公开的另一些实施例的会话重建的方法的工作流程图；
图3本公开的另一些实施例的会话重建的方法的工作流程图；
图4本公开的一些实施例的会话重建的方法中终端、AMF、SMF及UPF的交互流程图；
图5本公开的另一些实施例的会话重建的方法中终端、AMF、SMF及UPF的交互流程图；
图6为本公开的一些实施例的会话重建的装置的结构框图；
图7为本公开的一些实施例的AMF的结构框图；
图8为本公开的另一些实施例的会话重建的装置的结构框图；
图9为本公开的一些实施例的SMF的结构框图；
图10为本公开的另一些实施例的会话重建的装置的结构框图；
图11为本公开的一些实施例的终端的结构框图。
具体实施方式
为使本公开要解决的技术问题、技术方案和优点更加清楚，下面将结合具体实施例及附图进行详细描述。
本公开的实施例提供了会话重建的方法和装置、AMF、SMF及终端，解决了目前的机制无法保证AMF将两条到同一数据网络的PDU会话选择到相同的SMF中的问题。
如图1所示，本公开的一些实施例提供了一种会话重建的方法，应用于访问和移动性管理功能实体AMF，包括步骤101和102。
步骤101：获取终端发送的非接入层NAS消息，该NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，该NAS消息携带有初始PDU会话的第一标识信息及终端为上述新PDU会话分配的第二标识信息。
上述非接入层NAS消息为终端接收到SMF发送的重新建立PDU会话的通知消息后发送的，终端根据上述通知消息建立新PDU会话，并为新PDU会话分配新的会话标识信息，即上述第二标识信息。此时，终端发送的请求建立新PDU会话的非接入层消息与通常触发下的NAS消息不同，本公开实施例中终端发送的非接入层消息中包含有初始PDU会话的第一标识信息及所述终端为所述新PDU会话分配的第二标识信息，使得AMF能够根据初始PDU会话的第一标识信息选择到旧的SMF，即第一标识信息对应的SMF。
步骤102：向与上述第一标识信息对应的会话管理功能实体SMF发送会话管理请求，该会话管理请求携带有上述第一标识信息和第二标识信息，该会话管理请求用于使上述SMF根据该第一标识信息和该第二标识信息建立上述新PDU会话。
目前在5G系统中，SMF选择是由AMF完成的。UE为不同的PDU session分配PDU session ID。UE发送给AMF的非接入层消息包括：单一网络切片选择辅助信息(Single-network slice selection assistance information，S-NSSAI)、PDU会话标识(PDU Session ID)、N1 SM information：N1接口传递给SMF的消息，即传递给SMF的会话管理消息，具体格式如下：
NAS Message(S-NSSAI,DNN,PDU Session ID,N1 SM information)。
目前定义的PDU会话建立请求(PDU session establish request)消息中包含了上述信息。AMF只解析S-NSSAI,DNN，PDU Session ID，不解析N1 SM information。S-NSSAI，DNN，PDU Session ID用于AMF执行SMF选择。当 AMF收到NAS消息后根据PDU session ID选择路由的SMF信息，如果之前建立了这一PDU session，AMF就会保留PDU session ID与SMF ID之间的关联关系。后续AMF在收到这一PDU session ID相关的会话管理非接入层消息(SM NAS消息)后，AMF就会直接将这一SM NAS消息传递给SMF处理。而如果发起的NAS消息是新建PDU session的请求，则不存在与NAS消息中的PDU session ID相关联的SMF ID。SMF需要根据S-NSSAI,DNN等信息为这一PDU session选择新的SMF ID，并保存PDU session ID与SMF ID之间的关联关系。
本公开实施例中，在终端向AMF发送请求建立新PDU会话的非接入层消息时，携带初始PDU会话的第一标识信息及所述终端为所述新PDU会话分配的第二标识信息，AMF可以根据该非接入层消息，选择与第一标识信息对应的SMF，从而使得新PDU会话和初始PDU会话连接到相同的SMF。
进一步地，上述步骤102可具体包括步骤1021至1023。
步骤1021：对上述非接入层消息进行解析，得到所述第一标识信息。
这里的，非接入层消息可具体为PDU会话建立请求，所述PDU会话建立请求的PDU会话标识信息中携带有所述第一标识信息，所述PDU会话建立请求的N1会话管理消息中携带有所述第二标识信息。AMF对所述PDU会话建立请求中的PDU会话标识信息进行解析处理，得到所述第一标识信息。
或者，上述NAS消息为PDU会话重建请求，该PDU会话重建请求的PDU会话标识信息中携带有所述第一标识信息和所述第二标识信息。AMF对所述PDU会话重建请求的PDU会话标识信息进行解析处理，得到所述第一标识信息和所述第二标识信息。
本公开实施例中可以在PDU会话建立请求的PDU会话标识信息中携带第一标识信息，在PDU会话建立请求的N1会话管理消息中携带有所述第二标识信息；也可在重新定义的PDU会话重建请求的PDU会话标识信息中同时携带第一标识信息和第二标识信息，使AMF通过对PDU会话建立请求或PDU会话重建请求中的AMF非接入层消息进行解析，得到第一标识信息，从而能够将新PDU会话选择到初始PDU会话所连接的SMF上。
步骤1022：根据预先保存的PDU会话标识信息与SMF标识信息的对应 关系，获取与所述第一标识信息对应的SMF标识信息。
根据上述描述可知，AMF中保留有PDU session ID与SMF ID之间的关联关系，AMF根据该关联关系，便可选择到初始PDU会话对应的SMF标识信息，以便于后续将会话管理请求发送给对应的SMF，使SMF建立新PDU会话。
步骤1023：将所述会话管理请求发送给所述SMF标识信息对应的SMF。
这里，将会话管理请求发送给SMF标识信息对应的SMF，保证向终端发送通知消息SMF与建立新PDU会话的SMF为同一个SMF。SMF标识信息对应的SMF根据第一标识信息和第二标识信息建立新PDU会话。
进一步地，本公开实施例的会话重建的方法，还包括：
获取SMF发送的第二标识信息和SMF的标识信息，并按照对应关系进行保存。
这里，SMF根据第一标识信息和第二标识信息建立新PDU会话后，向AMF发送的第二标识信息和SMF的标识信息，以便于后续AMF根据第二标识信息和SMF的标识信息，将与第二标识信息相关的会话管理信息发送给该SMF。
本公开实施例的会话重建的方法，AMF获取终端发送的NAS消息，该非接入层消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，该NAS消息携带有初始PDU会话的第一标识信息及终端为上述新PDU会话分配的第二标识信息；向与上述第一标识信息对应的会话管理功能实体SMF发送会话管理请求，该会话管理请求携带有上述第一标识信息和第二标识信息，该会话管理请求用于使上述SMF根据该第一标识信息和该第二标识信息建立上述新PDU会话，达到新PDU会话和初始PDU会话连接到相同SMF的目的，有效保障了会话的连续性。
如图2所示，本公开的另一些实施例还提供了一种会话重建的方法，应用于会话管理功能实体SMF，包括步骤201至203。
步骤201：向终端发送重新建立PDU会话的通知消息。
SMF决定需要重建服务的UPF，然后SMF向UE发送通知消息，通知UE将在一段时间内删除初始PDU session并请求UE建立一条到相同数据网 络的新PDU session。通知消息包含初始PDU session的标识信息和网络希望保留初始PDU会话的定时器值。
步骤202：获取AMF发送的会话管理请求，所述会话管理请求为所述AMF接收到终端根据所述通知消息发送的NAS消息后发送的，且所述NAS消息和所述会话管理请求均携带有初始PDU会话的第一标识信息及新PDU会话的第二标识信息，且所述SMF为与所述第一标识信息对应的SMF，所述初始PDU会话与所述新PDU会话连接到相同的数据网络。
AMF接收到终端发送的、携带有第一标识信息和第二标识信息的NAS消息后，对NAS消息进行解析，得到第一标识信息，并向与第一标识信息对应的SMF发送会话管理请求，使新PDU会话与初始PDU会话连接到相同的SMF。
步骤203：根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话。
该步骤203可具体包括步骤2031和2032。
步骤2031：根据所述第一标识信息和所述第二标识信息，为所述新PDU会话选择新的用户面锚点UPF。
该新的用户面锚点不同于初始PDU会话对应的用户面锚点，由于会话管理请求中携带有第一标识信息和第二标识信息，因此SMF为新PDU会话选择用户面锚点选择时，可以选择与第一标识信息所对应的用户面锚点不同的新的用户面锚点，有效避免将两个会话选择到同一个用户锚点上。
步骤2032：与所述新的UPF建立N4接口的连接，并为所述新的UPF建立空口和N3用户面的连接。
这里，新PDU session成功建立一段时间后，网络在发起初始PDU session的删除，初始PDU session可以是由UE删除，也可以是定时器超时后由SMF删除。
进一步地，根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话的步骤之后，还包括：
建立所述第二标识信息和SMF的标识信息的对应关系，并将所述第二标识信息和SMF的标识信息发送给所述AMF。
这里，SMF根据第一标识信息和第二标识信息建立新PDU会话后，向AMF发送的第二标识信息和SMF的标识信息，以便于后续AMF根据第二标识信息和SMF的标识信息，将与第二标识信息相关的会话管理信息发送给该SMF。
本公开实施例的会话重建的方法，SMF向终端发送重新建立PDU会话的通知消息；获取AMF发送的会话管理请求；根据会话管理请求中的第一标识信息和第二标识信息，建立所述新PDU会话，保证新PDU会话和初始PDU会话连接到相同SMF的目的，进而有效保障了会话的连续性。
如图3所示，本公开的另一些实施例还提供了一种会话重建的方法，应用于终端，包括：
步骤301：根据会话管理功能实体SMF发送的重新建立PDU会话的通知消息，向AMF发送NAS消息，所述NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述非接入层消息携带有初始PDU会话的第一标识信息及所述新PDU会话的第二标识信息，所述NAS消息用于使所述AMF向与所述第一标识信息对应的SMF，发送携带有所述第一标识信息和第二标识信息的会话管理请求，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
终端根据上述通知消息建立新PDU会话，并为新PDU会话分配新的会话标识信息，即上述第二标识信息。此时，终端发送的请求建立新PDU会话的非接入层消息与通常触发下的NAS消息不同，本公开实施例中终端发送的非接入层消息中包含有初始PDU会话的第一标识信息及所述终端为所述新PDU会话分配的第二标识信息，使得AMF能够根据初始PDU会话的第一标识信息选择到旧的SMF，即第一标识信息对应的SMF。
进一步地，所述向AMF发送非接入层消息包括：
在PDU会话建立请求的PDU会话标识信息中添加所述第一标识信息，在所述PDU会话建立请求的N1会话管理消息中添加所述第二标识信息，并发送给所述AMF。
本公开实施例的会话重建的方法，终端根据会话管理功能实体SMF发送的重新建立PDU会话的通知消息，向AMF发送NAS消息；AMF根据终端 发送的NAS消息，向SMF发送携带有初始PDU会话的第一标识信息及为新PDU会话的第二标识信息的会话管理请求；SMF根据第一标识信息和第二标识信息建立新PDU会话。本公开实施例通过在上述非接入层消息和会话管理请求中携带第一标识信息和第二标识信息，实现了将新PDU会话连接到初始PDU会话所选择的SMF中的目的，有效保证了会话的连续性。
假定本公开实施例中终端发送的非接入层消息为PDU会话建立请求，下面结合图4来说明本公开的一些实施例的会话重建实现流程。
如图4所示，该实现流程包括步骤401至406。
步骤401：终端向AMF发送PDU会话建立请求，该PDU会话建立请求携带有初始PDU会话的第一标识信息及终端为所述新PDU会话分配的第二标识信息。
该PDU会话建立请求为终端收到SMF发送的重新建立PDU会话的通知消息后，向AMF发送的，该PDU会话建立请求的格式具体为：(PDU session ID1，N1 SM information(PDU session ID2))，其中，PDU session ID1为初始会话的第一标识信息，PDU session ID2为新PDU会话的第二标识信息。第二标识信息包含在SM information中透传给SMF。PDU会话建立请求还可以包含S-NSSAI，DN等信息。
步骤402：AMF根据PDU会话建立请求的第一标识信息选择SMF，并向选择的SMF发送携带会话管理请求，该会话管理请求携带有上述第一标识信息和第二标识信息。
具体的，对所述PDU会话建立请求中的PDU会话标识信息进行解析处理，得到所述第一标识信息；根据预先保存的PDU会话标识信息与SMF标识信息的对应关系，获取与所述第一标识信息对应的SMF标识信息；将所述会话管理请求发送给所述SMF标识信息对应的SMF。
其中，上述SMF发送会话管理请求的格式可具体为：(PDU session ID1，N1 SM information(PDU session ID2))。
步骤403：SMF根据第一标识信息和第二标识信息，选择新的UPF，并发起N4接口的建立过程。
步骤404：UPF向SMF返回N4接口的建立响应。
步骤405：SMF为新PDU session建立空口和N3用户面连接过程。
步骤406：新PDU会话建立完成后，SMF将第二标识信息和SMF标识信息发送给AMF。
AMF保存第二标识信息和SMF标识信息的关联关系，后续AMF在收到第二标识信息相关的会话管理相关消息时，AMF将NAS消息路由到SMF中。
本公开实施例的会话重建的方法，UE收到网络触发建立新的SSC mode 3的PDU session时，UE仍然重用PDU会话建立请求消息。在该消息中AMF会解析的PDU session ID仍然携带初始PDU会话的第一标识信息。而在N1SM information container中包含UE为新PDU会话分配的第二标识信息；AMF向与第一标识信息对应的SMF发送会话管理请求，该会话管理请求携带有第一标识信息和第二标识信息；SMF根据第一标识信息和第二标识信息建立新PDU会话，实现了将新PDU会话连接到初始PDU会话所选择的SMF中的目的，有效保证了会话的连续性。
假定本公开实施例中终端发送的非接入层消息为重新定义的PDU会话重建请求，该PDU会话重建请求携带有初始PDU会话的第一标识信息及终端为所述新PDU会话分配的第二标识信息，下面结合图5来说明本公开的另一些实施例的会话重建实现流程。
如图5所示，该实现流程包括步骤501至506。
步骤501：终端向AMF发送PDU会话重建请求，该PDU会话重建请求携带有初始PDU会话的第一标识信息及终端为所述新PDU会话分配的第二标识信息。
该PDU会话重建请求为终端收到SMF发送的重新建立PDU会话的通知消息后，向AMF发送的，该PDU会话重建请求的格式具体为：(PDU session ID1，PDU session ID2)，其中，PDU session ID1为初始会话的第一标识信息，PDU session ID2为新PDU会话的第二标识信息，该第一标识信息和第二标识信息在所述PDU会话重建请求的PDU会话标识信息中。
步骤502：AMF根据PDU会话重建请求的第一标识信息选择SMF，并向选择的SMF发送携带会话管理请求，该会话管理请求携带有上述第一标识信息和第二标识信息。
其中，上述SMF发送会话管理请求的格式可具体为：(PDU session ID1，PDU session ID2)。
步骤503：SMF根据第一标识信息和第二标识信息，选择新的UPF，并发起N4接口的建立过程。
步骤504：UPF向SMF返回N4接口的建立响应。
步骤505：SMF为新PDU session建立空口和N3用户面连接过程。
步骤506：新PDU会话建立完成后，SMF将第二标识信息和SMF标识信息发送给AMF。
AMF保存第二标识信息和SMF标识信息的关联关系，后续AMF在收到第二标识信息相关的会话管理相关消息时，AMF将NAS消息路由到SMF中。
本公开实施例的会话重建的方法，定义新的NAS消息用于发起新PDU session的建立请求。新的NAS消息具体为PDU会话重建请求，该PDU会话重建请求中携带有初始PDU会话的第一标识信息及新PDU会话分配的第二标识信息；AMF向与第一标识信息对应的SMF发送会话管理请求，该会话管理请求携带有第一标识信息和第二标识信息；SMF根据第一标识信息和第二标识信息建立新PDU会话，实现了将新PDU会话连接到初始PDU会话所选择的SMF中的目的，有效保证了会话的连续性。
如图6所示，本公开的一些实施例还提供了一种会话重建的装置，应用于访问和移动性管理功能实体AMF，包括：
第一获取模块601，用于获取终端发送的非接入层NAS消息，所述非接入层消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述NAS消息携带有初始PDU会话的第一标识信息及所述终端为所述新PDU会话分配的第二标识信息；
第一发送模块602，用于向与所述第一标识信息对应的会话管理功能实体SMF发送会话管理请求，所述会话管理请求携带有所述第一标识信息和第二标识信息，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
本公开实施例的会话重建的装置，所述第一发送模块602包括：
解析子模块6021，用于对所述NAS消息进行解析，得到所述第一标识 信息；
获取子模块6022，用于根据预先保存的PDU会话标识信息与SMF标识信息的对应关系，获取与所述第一标识信息对应的SMF标识信息；
发送子模块6023，用于将所述会话管理请求发送给所述SMF标识信息对应的SMF。
本公开实施例的会话重建的装置，所述非接入层消息为PDU会话建立请求，所述PDU会话建立请求的PDU会话标识信息中携带有所述第一标识信息，所述PDU会话建立请求的N1会话管理消息中携带有所述第二标识信息；
所述解析子模块6021用于对所述PDU会话建立请求中的PDU会话标识信息进行解析处理，得到所述第一标识信息。
本公开实施例的会话重建的方法，所述NAS消息为PDU会话重建请求，所述PDU会话重建请求的PDU会话标识信息中携带有所述第一标识信息和所述第二标识信息；
所述解析子模块6021用于对所述PDU会话重建请求的PDU会话标识信息进行解析处理，得到所述第一标识信息和所述第二标识信息。
本公开实施例的会话重建的装置，还包括：
第二获取模块603，用于获取SMF发送的第二标识信息和SMF的标识信息，并按照对应关系进行保存。
需要说明的是，该会话重建的装置是与第一实施例中的方法对应的装置，上述第一实施例中所有实现方式均适用于该装置的实施例中，也能达到相同的技术效果。
本公开实施例的会话重建的装置，获取终端发送的NAS消息，该非接入层消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，该NAS消息携带有初始PDU会话的第一标识信息及终端为上述新PDU会话分配的第二标识信息；向与上述第一标识信息对应的会话管理功能实体SMF发送会话管理请求，该会话管理请求携带有上述第一标识信息和第二标识信息，该会话管理请求用于使上述SMF根据该第一标识信息和该第二标识信息建立上述新PDU会话，达到新PDU会话和初始PDU会话连接到相同SMF的目的，有效保障了会话的连续性。
进一步地，本公开的一些实施例还提供了一种访问和移动性管理功能实体，如图7所示，包括第一存储器701、第一处理器702及存储在第一存储器701上并可在第一处理器702上运行的计算机程序，所述第一处理器执行所述计算机程序时实现第一实施例所述的会话重建的方法中的步骤。
当第一处理器702调用并执行所述第一存储器中所存储的计算机程序时，实现如下的功能模块：
第一获取模块，用于获取终端发送的非接入层NAS消息，所述非接入层消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述NAS消息携带有初始PDU会话的第一标识信息及所述终端为所述新PDU会话分配的第二标识信息；
第一发送模块，用于向与所述第一标识信息对应的会话管理功能实体SMF发送会话管理请求，所述会话管理请求携带有所述第一标识信息和第二标识信息，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
第一处理器702用于读取第一存储器中的程序，执行下列过程：获取终端发送的非接入层NAS消息，所述非接入层消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述NAS消息携带有初始PDU会话的第一标识信息及所述终端为所述新PDU会话分配的第二标识信息；向与所述第一标识信息对应的会话管理功能实体SMF发送会话管理请求，所述会话管理请求携带有所述第一标识信息和第二标识信息，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
另外，本公开的实施例还提供一种计算机可读存储介质，其上存储有计算机程序，其中，所述计算机程序使得计算机执行以下步骤：获取终端发送的非接入层NAS消息，所述非接入层消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述NAS消息携带有初始PDU会话的第一标识信息及所述终端为所述新PDU会话分配的第二标识信息；向与所述第一标识信息对应的会话管理功能实体SMF发送会话管理请求，所述会话管理请求携带有所述第一标识信息和第二标识信息，所述会话管理请求用于 使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
本公开实施例的AMF，获取终端发送的NAS消息，该非接入层消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，该NAS消息携带有初始PDU会话的第一标识信息及终端为上述新PDU会话分配的第二标识信息；向与上述第一标识信息对应的会话管理功能实体SMF发送会话管理请求，该会话管理请求携带有上述第一标识信息和第二标识信息，该会话管理请求用于使上述SMF根据该第一标识信息和该第二标识信息建立上述新PDU会话，达到新PDU会话和初始PDU会话连接到相同SMF的目的，有效保障了会话的连续性。
如图8所示，本公开的另一些实施例还提供了一种会话重建的装置，应用于会话管理功能实体SMF，包括：
第二发送模块801，用于向终端发送重新建立PDU会话的通知消息；
第三获取模块802，用于获取AMF发送的会话管理请求，所述会话管理请求为所述AMF接收到终端根据所述通知消息发送的NAS消息后发送的，且所述NAS消息和所述会话管理请求均携带有初始PDU会话的第一标识信息及新PDU会话的第二标识信息，且所述SMF为与所述第一标识信息对应的SMF，所述初始PDU会话与所述新PDU会话连接到相同的数据网络；
建立模块803，用于根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话。
本公开实施例的会话重建的装置，所述建立模块803包括：
选择子模块8031，用于根据所述第一标识信息和所述第二标识信息，为所述新PDU会话选择新的用户面锚点UPF；
建立子模块8032，用于与所述新的UPF建立N4接口的连接，并为所述新的UPF建立空口和N3用户面的连接。
本公开实施例的会话重建的装置，还包括：
第三发送模块804，用于建立所述第二标识信息和SMF的标识信息的对应关系，并将所述第二标识信息和SMF的标识信息发送给所述AMF。
需要说明的是，该会话重建的装置是与图2对应的实施例中的方法对应的装置，上述图2对应的实施例中所有实现方式均适用于该装置的实施例中，也能达到相同的技术效果。
本公开实施例的会话重建的装置，向终端发送重新建立PDU会话的通知消息；获取AMF发送的会话管理请求；根据会话管理请求中的第一标识信息和第二标识信息，建立所述新PDU会话，保证新PDU会话和初始PDU会话连接到相同SMF的目的，进而有效保障了会话的连续性。
进一步地，如图9所示，本公开的一些实施例还提供了一种会话管理功能实体SMF，包括第二存储器901、第二处理器902及存储在第二存储器901上并可在第二处理器902上运行的计算机程序，所述第二处理器902执行所述计算机程序时实现图2对应的实施例所述的会话重建的方法中的步骤。
当第二处理器902调用并执行所述第二存储器中所存储的计算机程序时，实现如下的功能模块：
第二发送模块，用于向终端发送重新建立PDU会话的通知消息；
第三获取模块，用于获取AMF发送的会话管理请求，所述会话管理请求为所述AMF接收到终端根据所述通知消息发送的NAS消息后发送的，且所述NAS消息和所述会话管理请求均携带有初始PDU会话的第一标识信息及新PDU会话的第二标识信息，且所述SMF为与所述第一标识信息对应的SMF，所述初始PDU会话与所述新PDU会话连接到相同的数据网络；
建立模块，用于根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话。
第二处理器902用于读取第二存储器中的程序，执行下列过程：向终端发送重新建立PDU会话的通知消息；获取AMF发送的会话管理请求，所述会话管理请求为所述AMF接收到终端根据所述通知消息发送的NAS消息后发送的，且所述NAS消息和所述会话管理请求均携带有初始PDU会话的第一标识信息及新PDU会话的第二标识信息，且所述SMF为与所述第一标识信息对应的SMF，所述初始PDU会话与所述新PDU会话连接到相同的数据网络；根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话。
另外，本公开的一些实施例还提供一种计算机可读存储介质，其上存储 有计算机程序，其中，所述计算机程序使得计算机执行以下步骤：向终端发送重新建立PDU会话的通知消息；获取AMF发送的会话管理请求，所述会话管理请求为所述AMF接收到终端根据所述通知消息发送的NAS消息后发送的，且所述NAS消息和所述会话管理请求均携带有初始PDU会话的第一标识信息及新PDU会话的第二标识信息，且所述SMF为与所述第一标识信息对应的SMF，所述初始PDU会话与所述新PDU会话连接到相同的数据网络；根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话。
本公开实施例的会话管理功能实体，向终端发送重新建立PDU会话的通知消息；获取AMF发送的会话管理请求；根据会话管理请求中的第一标识信息和第二标识信息，建立所述新PDU会话，保证新PDU会话和初始PDU会话连接到相同SMF的目的，进而有效保障了会话的连续性。
如图10所示，本公开的另一些实施例还提供了一种会话重建的装置，应用于终端，包括：
第四发送模块1001，用于根据会话管理功能实体SMF发送的重新建立PDU会话的通知消息，向AMF发送NAS消息，所述NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述非接入层消息携带有初始PDU会话的第一标识信息及所述新PDU会话的第二标识信息，所述NAS消息用于使所述AMF向与所述第一标识信息对应的SMF，发送携带有所述第一标识信息和第二标识信息的会话管理请求，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
本公开实施例的会话重建的装置，所述第四发送模块用于在PDU会话建立请求的PDU会话标识信息中添加所述第一标识信息，在所述PDU会话建立请求的N1会话管理消息中添加所述第二标识信息，并发送给所述AMF。
需要说明的是，该终端是与图3对应的实施例中的方法对应的装置，上述图3对应的实施例中所有实现方式均适用于该终端的实施例中，也能达到相同的技术效果。
本公开实施例的终端，根据会话管理功能实体SMF发送的重新建立PDU会话的通知消息，向AMF发送NAS消息；AMF根据终端发送的NAS消息， 向SMF发送携带有初始PDU会话的第一标识信息及为新PDU会话的第二标识信息的会话管理请求；SMF根据第一标识信息和第二标识信息建立新PDU会话。本公开实施例通过在上述非接入层消息和会话管理请求中携带第一标识信息和第二标识信息，实现了将新PDU会话连接到初始PDU会话所选择的SMF中的目的，有效保证了会话的连续性。
为了更好的实现上述目的，如图11所示，本公开的一些实施例还提供一种终端，该终端包括：第三处理器1100；通过总线接口与所述第三处理器1100相连接的第三存储器1120；存储在第三存储器1120上并可在第三处理器1100上运行的计算机程序，以及通过总线接口与第三处理器1100相连接的收发机1110；所述第三存储器用于存储所述第三处理器在执行操作时所使用的程序和数据；通过所述收发机1110接收下行控制信道；当第三处理器1100调用并执行所述第三存储器1120中所存储的程序和数据时，实现如下的功能模块：
第四发送模块，用于根据会话管理功能实体SMF发送的重新建立PDU会话的通知消息，向AMF发送NAS消息，所述NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述非接入层消息携带有初始PDU会话的第一标识信息及所述新PDU会话的第二标识信息，所述NAS消息用于使所述AMF向与所述第一标识信息对应的SMF，发送携带有所述第一标识信息和第二标识信息的会话管理请求，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
第三处理器1100用于读取第三存储器1120中的程序，执行下列过程：根据会话管理功能实体SMF发送的重新建立PDU会话的通知消息，通过收发机1110向AMF发送NAS消息，所述NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述非接入层消息携带有初始PDU会话的第一标识信息及所述新PDU会话的第二标识信息，所述NAS消息用于使所述AMF向与所述第一标识信息对应的SMF，发送携带有所述第一标识信息和第二标识信息的会话管理请求，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话区。
收发机1110，用于在第三处理器1100的控制下接收和发送数据。
其中，在图11中，总线架构可以包括任意数量的互联的总线和桥，具体由第三处理器1100代表的一个或多个处理器和第三存储器1120代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机1110可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元。针对不同的用户设备，用户接口1130还可以是能够外接内接需要设备的接口，连接的设备包括但不限于小键盘、显示器、扬声器、麦克风、操纵杆等。
第三处理器1100负责管理总线架构和通常的处理，第三存储器1120可以存储第三处理器1100在执行操作时所使用的数据。
另外，本公开的一些实施例还提供一种计算机可读存储介质，其上存储有计算机程序，其中，所述计算机程序使得计算机执行以下步骤：根据会话管理功能实体SMF发送的重新建立PDU会话的通知消息，向AMF发送NAS消息，所述NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述NAS消息携带有初始PDU会话的第一标识信息及所述新PDU会话的第二标识信息，所述NAS消息用于使所述AMF向与所述第一标识信息对应的SMF，发送携带有所述第一标识信息和第二标识信息的会话管理请求，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
本公开实施例的终端，第三处理器1100用于根据会话管理功能实体SMF发送的重新建立PDU会话的通知消息，向AMF发送NAS消息；AMF根据终端发送的NAS消息，向SMF发送携带有初始PDU会话的第一标识信息及为新PDU会话的第二标识信息的会话管理请求；SMF根据第一标识信息和第二标识信息建立新PDU会话。本公开实施例通过在上述非接入层消息和会话管理请求中携带第一标识信息和第二标识信息，实现了将新PDU会话连接到初始PDU会话所选择的SMF中的目的，有效保证了会话的连续性。
以上所述仅为本公开的较佳实施例而已，并不用以限制本公开，凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在 本公开的保护范围之内。

Claims (26)

  1. 一种会话重建的方法，应用于访问和移动性管理功能实体AMF，包括：
    获取终端发送的非接入层NAS消息，所述NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述NAS消息携带有初始PDU会话的第一标识信息及所述终端为所述新PDU会话分配的第二标识信息；
    向与所述第一标识信息对应的会话管理功能实体SMF发送会话管理请求，所述会话管理请求携带有所述第一标识信息和第二标识信息，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
  2. 根据权利要求1所述的会话重建的方法，其中，所述向与所述第一标识信息对应的会话管理功能实体SMF发送会话管理请求的步骤，包括：
    对所述NAS消息进行解析，得到所述第一标识信息；
    根据预先保存的PDU会话标识信息与SMF标识信息的对应关系，获取与所述第一标识信息对应的SMF标识信息；
    将所述会话管理请求发送给所述SMF标识信息对应的SMF。
  3. 根据权利要求2所述的会话重建的方法，其中，所述NAS消息为PDU会话建立请求，所述PDU会话建立请求的PDU会话标识信息中携带有所述第一标识信息，所述PDU会话建立请求的N1会话管理消息中携带有所述第二标识信息；
    所述对所述NAS消息进行解析，得到所述第一标识信息的步骤，包括：
    对所述PDU会话建立请求中的PDU会话标识信息进行解析处理，得到所述第一标识信息。
  4. 根据权利要求2所述的会话重建的方法，其中，所述NAS消息为PDU会话重建请求，所述PDU会话重建请求的PDU会话标识信息中携带有所述第一标识信息和所述第二标识信息；
    所述对所述NAS消息进行解析，得到所述第一标识信息的步骤，包括：
    对所述PDU会话重建请求的PDU会话标识信息进行解析处理，得到所述第一标识信息和所述第二标识信息。
  5. 根据权利要求1所述的会话重建的方法，还包括：
    获取SMF发送的第二标识信息和SMF的标识信息，并按照对应关系进行保存。
  6. 一种会话重建的装置，应用于访问和移动性管理功能实体AMF，包括：
    第一获取模块，用于获取终端发送的非接入层NAS消息，所述NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述NAS消息携带有初始PDU会话的第一标识信息及所述终端为所述新PDU会话分配的第二标识信息；
    第一发送模块，用于向与所述第一标识信息对应的会话管理功能实体SMF发送会话管理请求，所述会话管理请求携带有所述第一标识信息和第二标识信息，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
  7. 根据权利要求6所述的会话重建的装置，其中，所述第一发送模块包括：
    解析子模块，用于对所述NAS消息进行解析，得到所述第一标识信息；
    获取子模块，用于根据预先保存的PDU会话标识信息与SMF标识信息的对应关系，获取与所述第一标识信息对应的SMF标识信息；
    发送子模块，用于将所述会话管理请求发送给所述SMF标识信息对应的SMF。
  8. 根据权利要求7所述的会话重建的装置，其中，所述NAS消息为PDU会话建立请求，所述PDU会话建立请求的PDU会话标识信息中携带有所述第一标识信息，所述PDU会话建立请求的N1会话管理消息中携带有所述第二标识信息；
    所述解析子模块用于对所述PDU会话建立请求中的PDU会话标识信息进行解析处理，得到所述第一标识信息。
  9. 根据权利要求7所述的会话重建的装置，其中，所述NAS消息为PDU 会话重建请求，所述PDU会话重建请求的PDU会话标识信息中携带有所述第一标识信息和所述第二标识信息；
    所述解析子模块用于对所述PDU会话重建请求的PDU会话标识信息进行解析处理，得到所述第一标识信息和所述第二标识信息。
  10. 根据权利要求6所述的会话重建的装置，还包括：
    第二获取模块，用于获取SMF发送的第二标识信息和SMF的标识信息，并按照对应关系进行保存。
  11. 一种访问和移动性管理功能实体，包括第一存储器、第一处理器及存储在第一存储器上并可在第一处理器上运行的计算机程序，其特征在于，所述第一处理器执行所述计算机程序时实现如权利要求1至5中任一项所述的会话重建的方法中的步骤。
  12. 一种会话重建的方法，应用于会话管理功能实体SMF，包括：
    向终端发送重新建立PDU会话的通知消息；
    获取AMF发送的会话管理请求，所述会话管理请求为所述AMF接收到终端根据所述通知消息发送的NAS消息后发送的，且所述NAS消息和所述会话管理请求均携带有初始PDU会话的第一标识信息及新PDU会话的第二标识信息，且所述SMF为与所述第一标识信息对应的SMF，所述初始PDU会话与所述新PDU会话连接到相同的数据网络；
    根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话。
  13. 根据权利要求12所述的会话重建的方法，其中，所述根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话的步骤，包括：
    根据所述第一标识信息和所述第二标识信息，为所述新PDU会话选择新的用户面锚点UPF；
    与所述新的UPF建立N4接口的连接，并为所述新的UPF建立空口和N3用户面的连接。
  14. 根据权利要求12所述的会话重建的方法，其中，在根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话的步骤之后，所述方法还包括：
    建立所述第二标识信息和SMF的标识信息的对应关系，并将所述第二标 识信息和SMF的标识信息发送给所述AMF。
  15. 一种会话重建的装置，应用于会话管理功能实体SMF，包括：
    第二发送模块，用于向终端发送重新建立PDU会话的通知消息；
    第三获取模块，用于获取AMF发送的会话管理请求，所述会话管理请求为所述AMF接收到终端根据所述通知消息发送的NAS消息后发送的，且所述NAS消息和所述会话管理请求均携带有初始PDU会话的第一标识信息及新PDU会话的第二标识信息，且所述SMF为与所述第一标识信息对应的SMF，所述初始PDU会话与所述新PDU会话连接到相同的数据网络；
    建立模块，用于根据所述第一标识信息和所述第二标识信息，建立所述新PDU会话。
  16. 根据权利要求15所述的会话重建的装置，其中，所述建立模块包括：
    选择子模块，用于根据所述第一标识信息和所述第二标识信息，为所述新PDU会话选择新的用户面锚点UPF；
    建立子模块，用于与所述新的UPF建立N4接口的连接，并为所述新的UPF建立空口和N3用户面的连接。
  17. 根据权利要求15所述的会话重建的装置，还包括：
    第三发送模块，用于建立所述第二标识信息和SMF的标识信息的对应关系，并将所述第二标识信息和SMF的标识信息发送给所述AMF。
  18. 一种会话管理功能实体，包括第二存储器、第二处理器及存储在第二存储器上并可在第二处理器上运行的计算机程序，其特征在于，所述第二处理器执行所述计算机程序时实现如权利要求12至14中任一项所述的会话重建的方法中的步骤。
  19. 一种会话重建的方法，应用于终端，包括：
    根据会话管理功能实体SMF发送的重新建立PDU会话的通知消息，向AMF发送NAS消息，所述NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述NAS消息携带有初始PDU会话的第一标识信息及所述新PDU会话的第二标识信息，所述NAS消息用于使所述AMF向与所述第一标识信息对应的SMF，发送携带有所述第一标识信息和第二标识信息的会话管理请求，所述会话管理请求用于使所述SMF根据所述第 一标识信息和所述第二标识信息建立所述新PDU会话。
  20. 根据权利要求19所述的会话重建的方法，其中，所述向AMF发送NAS消息包括：
    在PDU会话建立请求的PDU会话标识信息中添加所述第一标识信息，在所述PDU会话建立请求的N1会话管理消息中添加所述第二标识信息，并发送给所述AMF。
  21. 一种会话重建的装置，应用于终端，包括：
    第四发送模块，用于根据会话管理功能实体SMF发送的重新建立PDU会话的通知消息，向AMF发送NAS消息，所述NAS消息用于请求建立一个与初始PDU会话连接到相同数据网络的新PDU会话，所述NAS消息携带有初始PDU会话的第一标识信息及所述新PDU会话的第二标识信息，所述NAS消息用于使所述AMF向与所述第一标识信息对应的SMF，发送携带有所述第一标识信息和第二标识信息的会话管理请求，所述会话管理请求用于使所述SMF根据所述第一标识信息和所述第二标识信息建立所述新PDU会话。
  22. 根据权利要求21所述的会话重建的装置，其中，所述第四发送模块用于在PDU会话建立请求的PDU会话标识信息中添加所述第一标识信息，在所述PDU会话建立请求的N1会话管理消息中添加所述第二标识信息，并发送给所述AMF。
  23. 一种终端，包括第三存储器、第三处理器及存储在第三存储器上并可在第三处理器上运行的计算机程序，其特征在于，所述第三处理器执行所述计算机程序时实现如权利要求19至20中任一项所述的会话重建的方法中的步骤。
  24. 一种计算机可读存储介质，其上存储有计算机程序，其中，当所述计算机程序被处理器执行时，实现如权利要求1至5中任一项所述的会话重建的方法中的步骤。
  25. 一种计算机可读存储介质，其上存储有计算机程序，其中，当所述计算机程序被处理器执行时，实现如权利要求12至14中任一项所述的会话重建的方法中的步骤。
  26. 一种计算机可读存储介质，其上存储有计算机程序，其中，当所述 计算机程序被处理器执行时，实现如权利要求19至20中任一项所述的会话重建的方法中的步骤。
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