CN113453301B - AMF, network slice selection method and AMF - Google Patents

AMF, network slice selection method and AMF Download PDF

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CN113453301B
CN113453301B CN202110726153.4A CN202110726153A CN113453301B CN 113453301 B CN113453301 B CN 113453301B CN 202110726153 A CN202110726153 A CN 202110726153A CN 113453301 B CN113453301 B CN 113453301B
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amf
network slice
information
terminal device
terminal equipment
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CN113453301A (en
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王胡成
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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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
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • 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

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

Abstract

The invention discloses an AMF (advanced metering framework), a network slice selection method and an AMF (advanced metering framework), which are used for providing a new network slice selection method so as to ensure that all PDN (public data network) connections of terminal equipment can be migrated to a 5G network as much as possible. The AMF selection method comprises the following steps: a first AMF receives a relocation request message from a mobility management entity MME, wherein the relocation request message carries an identifier of a terminal device; the first AMF acquires the subscription information of the terminal equipment according to the identifier of the terminal equipment, wherein the subscription information comprises the information of the network slice currently accessed by the terminal equipment; and the first AMF selects a second AMF for the terminal equipment according to the information of the network slice currently accessed by the terminal equipment.

Description

AMF, network slice selection method and AMF
The invention application is a divisional application of the invention application with the application date of 2018, 26.06.26. 201810671090.5 and the name of 'AMF, network slice selection method and AMF', and the whole content of the invention application is also contained in the mother case.
Technical Field
The invention relates to the technical field of communication, in particular to an AMF, a network slice selection method and an AMF.
Background
Please refer to fig. 1, which is a network architecture diagram of a fifth generation mobile communication technology (5G) network And Long Term Evolution (LTE) network interoperation scenario, wherein an N26 interface between a Mobility Management Entity (MME) in the LTE network And an Access And Mobility Management Function Entity (AMF) in the 5G network is optionally supported, and when the network supports the N26 interface, handover between the 5G network And the LTE network can be supported, and context information (context) of a terminal device, such as a User Equipment (UE), can be transferred between the MME And the AMF, and the context information can include a Mobility context And a session connection context.
When a terminal device accesses a network supporting an N26 interface, the network may configure a Registration Mode of the terminal device as a Single Registration Mode (Single Registration Mode). When a terminal device in a single registration mode requests to establish a Protocol Data Unit (PDU) Session (Session), a Control plane Packet Data Gateway and a Session Management Function entity (Packet Data Network-Control + Session Management Function, PGW-C + SMF) that receive a PDU Session establishment request message of the terminal device request allocation of an Evolved Packet System (EPS) bearer identifier (Identity, ID) to an AMF; alternatively, when the PGW-C + SMF determines that a Service of Quality of Service (QoS) flow of the PDU session it serves needs to be mapped to a new EPS bearer, the PGW-C + SMF also requests the AMF for the allocation of an EPS bearer ID. If the AMF successfully allocates the EPS bearer ID and provides the EPS bearer ID to the PGW-C + SMF, the PGW-U + UPF is requested to establish a tunnel of the EPS bearer, so that in the cross-system switching process of the terminal equipment from the 5G network to the LTE network, the PGW-U + UPF can correctly receive a data packet of the terminal equipment from a Serving GateWay (SGW).
In the 5G network, a physical network is divided into a plurality of virtual logic networks, each logic network corresponds to different application scenes, and the logic networks become network slices. For example, a network slice is defined according to user requirements, and a network slice for high definition video communication, a network slice for mobile phone communication, a network slice for mass internet of things, and the like can be defined. In order to enable a user of a terminal device to simultaneously acquire a plurality of services, different services of the user are allowed to be respectively accessed into different network slices.
At present, a method for selecting a Network Slice mainly includes that a Radio Access Network (RAN) selects a Network Slice through Network Slice Selection Assistance Information (NSSAI) provided by a terminal device, and an AMF relocation (relocation) method, that is, an AMF relocation method, in a connection state registration process is used to find and determine a final AMF to realize Selection of the Network Slice.
The method for providing the auxiliary Information by the terminal equipment selects the Network Slice, aims at connection of each Packet Data Network (PDN) of the terminal equipment, the terminal equipment needs to associate Single Network Slice Selection auxiliary Information (S-NSSAI) with a default EPS bearer ID), then the terminal equipment transmits the association of the S-NSSAI and the EPS bearer ID to an MME through a transparent container in an Attach process and a PDN connection establishment process, and the MME forwards the transparent container to AMF. It can be seen that this method has an impact on the protocol and flow of an Evolved Packet Core (EPC) system.
In the AMF relocation method in the connection state registration process, the MME searches for the temporary AMF to provide service for the terminal equipment in the switching process of switching the EPS to 5 Gs. Before the MME performs the switching, the temporary AMF obtains the S-NSSAI of the terminal equipment from the PGW-C + SMF of the terminal equipment of each service. After the switching is completed, the terminal equipment initiates a connection state registration updating process. In the registration updating process, the temporary AMF reselects the terminal equipment according to S-NSSAI of all PDU sessions of the terminal equipment, and then the terminal equipment is oriented to the AMF capable of serving the terminal equipment by utilizing an AMF relocation process. However, the temporarily selected AMF may not be able to serve all PDN connections of the terminal device, that is, the PGW-C + SMF corresponding to the PDN connection may not be reached, and there is a problem that some PDU connections are interrupted during the handover.
In summary, the current choice of network slice either affects the EPC system or may cause some PDU connections to be broken during handover.
Disclosure of Invention
The embodiment of the invention provides an AMF (advanced metering framework), a network slice selection method and an AMF (advanced metering framework), which are used for providing a new network slice selection method so as to ensure that all PDN (public data network) connections of terminal equipment can be migrated to a 5G network as much as possible.
In a first aspect, a method for selecting an access and mobility management function (AMF) is provided, where the method includes:
a first AMF receives a relocation request message from a Mobile Management Entity (MME), wherein the relocation request message carries an identifier of a terminal device;
the first AMF acquires the subscription information of the terminal equipment according to the identification of the terminal equipment, wherein the subscription information comprises the information of the network slice currently accessed by the terminal equipment;
and the first AMF selects a second AMF for the terminal equipment according to the information of the network slice currently accessed by the terminal equipment.
In the embodiment of the invention, the first AMF selects the AMF through the subscription information of the terminal equipment, and the subscription information comprises the information of the network slice currently accessed by the terminal equipment, namely the AMF is selected through the information of all the PDN connection network slices currently accessed by the terminal equipment, so that the selected AMF can serve all the PDN connections of the terminal equipment, and the condition that all the PDN connections of the terminal equipment can be transferred to a 5G network is ensured as much as possible.
Optionally, the selecting, by the first AMF, a second AMF for the terminal device according to the information of the network slice currently accessed by the terminal device includes:
the first AMF determines single network slice selection auxiliary information S-NSSAI associated with a PDU session established by the terminal equipment according to the information of the network slice currently accessed by the terminal equipment;
and the first AMF selects the second AMF for the terminal equipment according to all S-NSSAIs associated with all PDU sessions currently established by the terminal equipment.
Optionally, the selecting, by the first AMF, the second AMF for the terminal device according to all S-NSSAIs associated with all PDU sessions currently established by the terminal device includes:
the first AMF sends a request message to a network slice selection function NSSF, wherein the request message carries all the S-NSSAIs and is used for requesting the NSSF to select the second AMF for the terminal equipment;
the first AMF receives a feedback message from the NSSF, wherein the feedback message carries the identifier of the second AMF or carries an AMF set;
if the feedback message carries the identifier of the second AMF, the first AMF selects the second AMF indicated by the feedback message, or if the feedback message carries the AMF set, the first AMF selects the second AMF from the AMF set.
The two alternatives described above describe how the first AMF can select the second AMF based on S-NSSAI, and the AMF can be selected by requesting NSSF. The NSSF can directly select the second AMF, also can select a plurality of AMFs, and then the first AMF selects one AMF from the plurality of AMFs as the second AMF, and the second AMF can be rotated in any mode, so that the method is flexible.
Optionally, before the first AMF selects the second AMF for the terminal device according to the S-NSSAI with which the terminal device is currently associated, the method further includes:
the first AMF determines that the first AMF cannot serve a plurality of network slices indicated by the S-NSSAI with which the terminal equipment is currently associated according to all the S-NSSAIs.
This alternative approach describes that before the first AMF selects the second AMF, it may be determined whether the first AMF can serve multiple network slices indicated by the S-NSSAI with which the terminal device is currently associated, and if so, the first AMF may itself meet the requirement for serving the terminal device, and at this time, the second AMF may not be selected, so as to save overhead. And if the first AMF can serve a plurality of network slices indicated by the S-NSSAI with which the terminal equipment is currently associated, the second AMF is selected to ensure that the terminal equipment is served without influencing the service performed by the terminal equipment.
Optionally, the obtaining, by the first AMF, subscription information of the terminal device according to the identifier of the terminal device includes:
the first AMF sends an acquisition message to a Unified Data Management (UDM) and a Home Subscriber Server (HSS), wherein the acquisition message comprises an identifier of the terminal equipment and is used for acquiring subscription information of the terminal equipment;
the first AMF receives the subscription information from the UDM and the HSS.
Optionally, after the first AMF selects the second AMF for the terminal device according to all S-NSSAIs, the method further includes:
the first AMF sends a relocation reject response message to the MME, wherein the relocation reject response message carries the identification information of the second AMF, so as to instruct the MME to send the relocation request message to the second AMF.
Optionally, the relocation reject response message includes the subscription information, where the subscription information includes information of a network slice currently accessed by the terminal device.
Optionally, after the first AMF selects the second AMF for the terminal device according to the S-NSSAI with which the terminal device is currently associated, the method further includes:
and the first AMF sends the relocation request message sent by the MME and the acquired information of the network slice currently accessed by the terminal equipment to the second AMF.
The above three alternative ways describe how the first AMF informs the second AMF about the information about the terminal device after selecting the second AMF, so that the second AMF is ready for handover of the network slice. The embodiment of the invention can send the relevant information of the terminal equipment to the second AMF through the MME.
In a second aspect, a method for selecting a network slice is provided, where the method includes:
a second access and mobility management function (AMF) receives a relocation request message and receives information of a network slice currently accessed by the terminal equipment, wherein the relocation request message comprises an identifier of the terminal equipment, and the network slice information comprises single network slice selection auxiliary information S-NSSAI currently associated with a Protocol Data Unit (PDU) session;
and aiming at the PDU session of the home routing, the second AMF selects a visited session management function entity V-SMF for the PDU session according to the currently associated S-NSSAI of the PDU session so as to complete the network slice selection aiming at the PDU session.
The embodiment of the invention introduces how the second AMF prepares for network slice selection for a PDU session established by the terminal device. For a home routed PDU session, the second AMF may select a V-SMF for the PDU session based on the S-NSSAI currently associated with the PDU session established by the terminal device, thereby providing for network slice selection for the PDU session established by the terminal device.
Optionally, the receiving, by the second AMF, information of the network slice currently accessed by the terminal device includes:
the second AMF receives information of a network slice currently accessed by the terminal equipment from the first AMF, or receives information of a network slice currently accessed by the terminal equipment from a Mobility Management Entity (MME).
This alternative mode describes two acquisition modes for the second AMF to acquire the information of the network slice currently accessed by the terminal device. In the embodiment of the present invention, the second AMF may obtain information of a network slice currently accessed by the terminal device from the first AMF, and may also obtain information of a network slice currently accessed by the terminal device from the MME, which is more flexible.
Optionally, after the second AMF selects a V-SMF for the PDU session according to the S-NSSAI currently associated with the PDU session, the method further includes:
the second AMF sends a response message of the relocation request message to the MME.
In a third aspect, there is provided an AMF comprising:
a memory to store instructions;
a processor for reading the instructions in the memory, performing the following processes:
receiving a relocation request message from a Mobility Management Entity (MME) through a transceiver, wherein the relocation request message carries an identifier of a terminal device;
acquiring subscription information of the terminal equipment according to the identifier of the terminal equipment, wherein the subscription information comprises information of a network slice currently accessed by the terminal equipment;
selecting a second AMF for the terminal equipment according to the information of the network slice currently accessed by the terminal equipment;
the transceiver is used for transceiving data under the control of the processor.
Optionally, the processor is specifically configured to:
determining single network slice selection auxiliary information S-NSSAI associated with a PDU session established by the terminal equipment according to the information of the network slice currently accessed by the terminal equipment;
and selecting the second AMF for the terminal equipment according to all S-NSSAIs associated with all PDU sessions currently established by the terminal equipment.
Optionally, the processor is specifically configured to:
sending a request message to a Network Slice Selection Function (NSSF), wherein the request message carries all the S-NSSAIs and is used for requesting the NSSF to select the second AMF for the terminal equipment;
receiving a feedback message from the NSSF, wherein the feedback message carries the identifier of the second AMF, or carries an AMF set;
and if the feedback message carries the identifier of the second AMF, selecting the second AMF indicated by the feedback message, or if the feedback message carries the AMF set, selecting the second AMF from the AMF set.
Optionally, the processor is further configured to:
determining, from the all S-NSSAIs, that the first AMF is not capable of serving the plurality of network slices indicated by the S-NSSAI with which the terminal device is currently associated.
Optionally, the transceiver is specifically configured to:
sending an acquisition message to a Unified Data Management (UDM) and a Home Subscriber Server (HSS), wherein the acquisition message comprises an identifier of the terminal equipment and is used for acquiring subscription information of the terminal equipment;
receiving the subscription information from the UDM and the HSS.
Optionally, the transceiver is further configured to:
sending a relocation reject response message to the MME, wherein the relocation reject response message carries the identification information of the second AMF, so as to instruct the MME to send the relocation request message to the second AMF.
Optionally, the relocation reject response message includes the subscription information, where the subscription information includes information of a network slice currently accessed by the terminal device.
Optionally, the transceiver is further configured to:
and sending the relocation request message sent by the MME and the acquired information of the network slice currently accessed by the terminal equipment to the second AMF.
The technical effects of the AMF provided by the embodiment of the present invention may refer to the technical effects of the implementation manners of the first aspect, and are not described herein again.
In a fourth aspect, there is provided an AMF comprising:
a memory to store instructions;
a processor for reading the instructions in the memory and performing the following processes:
receiving a relocation request message through a transceiver, and receiving information of a network slice currently accessed by the terminal equipment, wherein the relocation request message comprises an identifier of the terminal equipment, and the network slice information comprises single network slice selection auxiliary information S-NSSAI currently associated with a PDU session;
aiming at a PDU session of a home routing, selecting a visited session management function entity (V-SMF) for the PDU session according to the currently associated S-NSSAI of the PDU session so as to complete the selection of a network slice aiming at the PDU session;
the transceiver is used for transceiving data under the control of the processor.
Optionally, the transceiver is specifically configured to:
receiving information of a network slice currently accessed by the terminal device from the first AMF, or receiving information of a network slice currently accessed by the terminal device from a Mobility Management Entity (MME).
Optionally, the transceiver is further configured to:
and sending a response message of the relocation request message to the MME.
The technical effects of the AMF provided by the embodiment of the present invention can be referred to the technical effects of the implementation manners of the second aspect, and are not described herein again.
In a fifth aspect, there is provided an AMF comprising:
a receiving unit, configured to receive a relocation request message from a mobility management entity MME, where the relocation request message carries an identifier of a terminal device;
an obtaining unit, configured to obtain subscription information of the terminal device according to an identifier of the terminal device, where the subscription information includes information of a network slice to which the terminal device is currently accessed;
and the selecting unit is used for selecting a second AMF for the terminal equipment according to the information of the network slice currently accessed by the terminal equipment.
Optionally, the selecting unit is specifically configured to:
determining single network slice selection auxiliary information S-NSSAI associated with a PDU session established by the terminal equipment according to the information of the network slice currently accessed by the terminal equipment;
determining the S-NSSAI which is currently associated with the terminal equipment according to the S-NSSAI;
and selecting the second AMF for the terminal equipment according to the S-NSSAI currently associated with the terminal equipment.
Optionally, the receiving unit is specifically configured to:
sending a request message to a network slice selection function NSSF, wherein the request message carries all the S-NSSAIs and is used for requesting the NSSF to select the second AMF for the terminal equipment;
receiving a feedback message from the NSSF, wherein the feedback message carries the identifier of the second AMF, or carries an AMF set;
the selection unit is specifically configured to: and if the feedback message carries the identifier of the second AMF, selecting the second AMF indicated by the feedback message, or if the feedback message carries the AMF set, selecting the second AMF from the AMF set.
Optionally, the selecting unit is further configured to:
determining, from the all S-NSSAIs, that the first AMF is not capable of serving the plurality of network slices indicated by the S-NSSAI with which the terminal device is currently associated.
Optionally, the receiving unit is specifically configured to:
sending an acquisition message to a Unified Data Management (UDM) and a Home Subscriber Server (HSS), wherein the acquisition message comprises an identifier of the terminal equipment and is used for acquiring subscription information of the terminal equipment;
receiving the subscription information from the UDM and the HSS.
Optionally, the receiving unit is further configured to:
sending a relocation reject response message to the MME, wherein the relocation reject response message carries the identification information of the second AMF, so as to instruct the MME to send the relocation request message to the second AMF.
Optionally, the relocation reject response message includes the subscription information, and the subscription information includes information of a network slice currently accessed by the terminal device.
Optionally, the receiving unit is further configured to:
and sending the relocation request message sent by the MME and the acquired information of the network slice currently accessed by the terminal equipment to the second AMF.
The technical effects of the AMF provided by the embodiment of the present invention may refer to the technical effects of the implementation manners of the first aspect, and are not described herein again.
In a sixth aspect, there is provided an AMF comprising:
a receiving unit, configured to receive a relocation request message and receive information of a network slice currently accessed by the terminal device, where the relocation request message includes an identifier of the terminal device, and the network slice information includes single network slice selection assistance information S-NSSAI currently associated with a PDU session;
and the selecting unit is used for selecting a visited session management function entity V-SMF for the PDU session according to the currently associated S-NSSAI of the PDU session aiming at the PDU session of the home routing so as to complete the network slice selection aiming at the PDU session.
Optionally, the receiving unit is specifically configured to:
receiving information of a network slice currently accessed by the terminal device from the first AMF, or receiving information of a network slice currently accessed by the terminal device from a Mobility Management Entity (MME).
Optionally, the receiving unit is further configured to:
and sending a response message of the relocation request message to the MME.
The technical effects of the AMF provided by the embodiment of the present invention can be referred to the technical effects of the implementation manners of the second aspect, and are not described herein again.
In a seventh aspect, a computer storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the method according to any of the first or second aspects.
In the embodiment of the invention, the AMF is selected through the subscription information of the terminal equipment, and the subscription information comprises the information of the network slice currently accessed by the terminal equipment and can also be considered as the information of all the corresponding PDN connection network slices currently accessed by the terminal equipment. Therefore, the selection method selects the AMF according to the information of all the PDN connection network slices currently accessed by the terminal equipment, so that the selected AMF can serve all the PDN connections of the terminal equipment, and the condition that all the PDN connections of the terminal equipment can be transferred to the 5G network is ensured as much as possible.
Drawings
Fig. 1 is a network architecture model supporting interoperation between a 5G network and an LTE network according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a process for establishing a PDN connection by a terminal device according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a method for selecting AMF and network slices according to an embodiment of the present invention;
fig. 4 is another schematic flow chart of a method for selecting an AMF and a network slice according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an AMF according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an AMF according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an AMF according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an AMF according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly and completely apparent, the technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.
At present, there are two main methods for selecting network slices, which are the first: selecting a network slice through NSSAI provided by the terminal equipment; and the second method comprises the following steps: AMF relocation method in the process of connection state registration.
In the first method, the terminal device needs to associate the S-NSSAI with a default EPS bearer ID, then the terminal device transfers the association between the S-NSSAI and the EPS bearer ID to the MME through the transparent container in the PDN connection establishment process, and the MME forwards the transparent container to the AMF, which affects the protocol and flow of the EPC system.
In the second method, the MME searches for a temporary AMF to provide services for the terminal device, the temporary AMF reselects the AMF according to S-NSSAI of all PDU sessions of the terminal device, and then directs the terminal device to the AMF capable of serving the terminal device by using an AMF relocation process. However, the temporarily selected AMF may not be able to serve all PDN connections of the terminal device, and there is a problem that some PDU connections are interrupted during handover.
It can be seen that, in the two methods in the prior art, either the EPC system is affected, or some PDU connections may be interrupted during the handover process, that is, it cannot be guaranteed that all PDN connections of the terminal device can be migrated to the 5G network.
In view of this, an embodiment of the present invention provides a method for selecting an AMF and a network slice, where the selection method selects the AMF through subscription information of a terminal device, and the subscription information includes information of a network slice currently accessed by the terminal device, and may also be considered as information of all PDN connection network slices currently accessed by the terminal device. Therefore, the selection method selects the AMF according to the information of all the PDN connection network slices currently accessed by the terminal equipment, so that the selected AMF can serve all the PDN connections of the terminal equipment, and all the PDN connections of the terminal equipment can be guaranteed to be migrated to the 5G network as much as possible.
In the embodiment of the present invention, when a user of a terminal device simultaneously obtains multiple services and different services need to be respectively accessed to different network slices, when a network providing services for the terminal device needs to be switched from an LTE network to a 5G network, a PDN Connection (Connection) needs to be established first in a preparation process of the terminal device for switching the network slices.
Specifically, referring to fig. 1, the terminal device may send a PDN Connection Request (PDN connectivity Request) message to the MME to Request establishment of a PDN Connection (Connection). The PDN connectivity Request message carries the ID of the terminal device. After receiving the PDN Connectivity Request message, the MME may send a Create Session Request (Create Session Request) message to the PGW-C + SMF, and feed back a PDN connection reception (PDN Connectivity Accept) message to the AMF. After receiving the Create Session Request message, the PGW-C + SMF may feed back a Create Session Response (Create Session Response) message to the MME, and obtain a PDU Session identifier (PDU Session ID) allocated by the terminal device from the Create Session Request message, and obtain a mapping parameter of the PDN Connection in the 5GC, such as S-NSSAI, or a Data Network Name (DNN), and then the PGW-C + SMF may send a notification (Notify) message to a Unified Data Management and Home Subscriber Server (UDM + HSS), where the Notify message carries the PDU Session ID, S-NSSAI, and DNN, or may also carry the PDU Session ID, S-NSSAI, and Access Point Name (Access Point Name, APN).
It should be noted that, in the embodiment of the present invention, the EPC needs to store the information of the PDN connection established by the UE in the UDM + HSS, for example, the MME receives the PDU session ID, S-NSSAI, and DNN fed back by the PGW-C + SMF, then sends a message, for example, a Notify message, to the UDM + HSS, and stores the PDU session ID, S-NSSAI, and DNN in the UDM + HSS. Or, for example, before or after the Create Session Response message is fed back to the MME, the PGW-C + SMF sends a message, for example, a Notify message, to the UDM + HSS, and saves the PDU Session ID, S-NSSAI, and DNN in the UDM + HSS. And when the PDN or PDU session is released, the PGW-C + SMF can delete the association of the PDU session ID, S-NSSAI and DNN from the UDM + HSS so as to save the storage space.
The technical scheme provided by the embodiment of the invention is described below by combining the accompanying drawings.
Referring to fig. 3, an embodiment of the present invention provides a method for selecting an AMF, where the method may be applied to a terminal device to switch from an LTE network to a 5G network, and a Target AMF in fig. 3 represents a second AMF, and a flow of the method is described as follows.
S10, the first AMF receives a relocation request message from an MME, wherein the relocation request message carries an identifier of a terminal device;
s20, the first AMF acquires the subscription information of the terminal equipment according to the identification of the terminal equipment, wherein the subscription information comprises the information of the network slice currently accessed by the terminal equipment;
and S30, the first AMF selects a second AMF for the terminal equipment according to the information of the network slice currently accessed by the terminal equipment.
In the embodiment of the present invention, when the terminal device needs to perform Network slice switching, a Radio Access Network (RAN) device to which the terminal device accesses may perform step S101, and send a Handover request message to an MME, where the Handover request message carries a terminal device ID. In step S10, the MME receives the Handover Request message, and may execute step S102 to send a Relocation Request (Forward Relocation Request) message to the first AMF, where the Forward Relocation Request message carries an Identifier (ID) of the terminal device. Wherein, the first AMF may be one AMF temporarily selected by the MME.
In step S20, after receiving the Forward location Request message, the first AMF may obtain an ID of the terminal device from the Forward location Request message, and obtain subscription information of the terminal device according to the ID of the terminal device, where the subscription information includes information of a network slice to which the terminal device is currently accessed, or may also be considered as information of a network slice in which the terminal device is currently located. When the first AMF acquires the Subscription information, in step S201, a request message is sent to the UDM + HSS, for example, a numm _ SDM _ Get service invoking the UDM, where the message carries an ID of the terminal device, for example, SUPI (Subscription Permanent Identifier) for acquiring the Subscription information of the terminal device.
In step S202, the UDM + HSS may feed back, to the first AMF, the subscription information of the terminal device according to the ID of the terminal device carried in the acquisition message. In a possible embodiment, the UDM + HSS may send a numm _ SDM _ Response message to the first AMF, where the numm _ SDM _ Response message carries subscription information, where the subscription information includes information of a network slice to which the terminal device currently accesses, that is, SM context in 5GC of all current PDN connections of the terminal device, for example, including PDU session ID, S-NSSAI, DNN, and the like.
In step S30, after the first AMF obtains the subscription information, a second AMF may be selected for the terminal device according to the information of the network slice currently accessed by the terminal device in the subscription information.
Specifically, the first AMF may determine, according to information of a network slice to which the terminal device currently accesses, an S-NSSAI associated with the terminal device establishing the PDU session. And the first AMF determines the S-NSSAI currently associated with the terminal equipment according to the S-NSSAI, so that the second AMF is selected for the terminal equipment according to the S-NSSAI currently associated with the terminal equipment.
First, the first AMF determines whether the first AMF can serve multiple network slices indicated by the S-NSSAI with which the terminal device is currently associated according to all the S-NSSAIs, and if the first AMF can serve multiple network slices indicated by the S-NSSAI with which the terminal device is currently associated, the first AMF itself can meet the requirement for serving the terminal device, and at this time, the first AMF may be determined as the second AMF, so as to save overhead. If the first AMF cannot serve multiple network slices indicated by the S-NSSAI with which the terminal device is currently associated, the first AMF needs to reselect an AMF, that is, a second AMF, for the terminal device, so as to ensure that the terminal device is served without affecting the service performed by the terminal device. Here, the plurality of network slices indicated by the S-NSSAI with which the terminal device is currently associated cannot be served by the first AMF may be understood as all network slices indicated by the S-NSSAI with which the terminal device is currently associated cannot be served by the first AMF, that is, all network slices indicated by the S-NSSAI with which the terminal device is currently associated cannot be served by the first AMF as long as one of all network slices cannot be served. It may also be understood that the first AMF is not able to serve more than one of all network slices indicated by the S-NSSAI with which the terminal device is currently associated, specifically determined according to the actual network deployment. It should be noted that the first AMF and the second AMF may only play different roles at different times, and the first AMF may be the second AMF at the next time, and the second AMF may be the first AMF at the next time.
When the first AMF is not capable of serving multiple Network slices indicated by the S-NSSAI with which the terminal device is currently associated, in step S301, the first AMF may send a request message (e.g., NSSF _ Network Slice Selection _ Get message) to a Network Slice Selection Function (NSSF) to request the NSSF to select a second AMF for the terminal device. After the NSSF receives the request message, step S302 may be performed to send a feedback message (for example, NSSF _ Network Slice Selection _ Response (AMF set)) to the first AMF, where the feedback message may carry an identifier of the second AMF, or the feedback message may also carry an AMF set, where any one AMF in the AMF set may be capable of serving multiple Network slices indicated by the S-NSSAI with which the terminal device is currently associated. The NSSF may be considered to select the second AMF for the terminal device if the feedback message carries an identity of the second AMF. If the feedback message carries the AMF set, the NSSF may be considered to select multiple AMFs for the terminal device, and at this time, the first AMF may select one AMF from the AMF set as the second AMF.
The selection method selects the second AMF through the subscription information of the terminal equipment, and the subscription information comprises the information of the network slice currently accessed by the terminal equipment, namely the selection method selects the second AMF through the information of all the PDN connection network slices currently accessed by the terminal equipment, so that the selected second AMF can serve all the PDN connections of the terminal equipment, and all the PDN connections of the terminal equipment can be ensured to be transferred to a 5G network as much as possible.
After the first AMF selects the second AMF, the first AMF may send a relocation request message sent by the MME and the acquired information of the network slice to which the terminal device currently accesses to the second AMF. In the embodiment of the present invention, the first AMF may send the relocation request message sent by the MME and the acquired information of the network slice currently accessed by the terminal device to the second AMF in the following two manners, which are respectively described below.
In a first manner, please continue to refer to fig. 3, the first AMF sends the relocation request message sent by the MME and the obtained information of the network slice currently accessed by the terminal device to the second AMF by initiating an AMF relocation procedure, that is, by sending a request message (for example, namf _ Communication _ N1 MessageNotify) to the second AMF. Since it is within the scope of the prior art to send the Namf _ Communication _ N1MessageNotify message to the second AMF by initiating the AMF relocation procedure, it is not described herein again.
In a second manner, please refer to fig. 4, target AMF in fig. 4 represents a second AMF. The first AMF may send a Relocation Reject (Forward Relocation Reject) response message to the MME, where the Forward Relocation Reject response message carries identification information of the second AMF to instruct the MME to send the Relocation request message to the second AMF. Thus, the MME sends a relocation request message to the second AMF. Meanwhile, the Forward Relocation Reject response message carries subscription information, including information of a network slice currently accessed by the terminal device, for example, SM context, including PDU session ID and S-NSSAI, and may also include information of a PDU session of a home routed (home routed). The first AMF sends the subscription information to the MME through a Forward Relocation Reject response message, and the MME sends the subscription information to the second AMF.
After receiving the relocation request information and the information of the network slice currently accessed by the terminal device, the second AMF may prepare for handover of the network slice. In the preparation process of switching the Network slice, the second AMF selects a Visited session management function entity (V-SMF) for the PDU session according to the currently associated S-NSSAI of the PDU session, and then establishes a connection to an Intermediate session management function entity (I-SMF) or an H-SMF through the selected V-SMF to complete the preparation of selecting the Network slice for the PDU session.
After the second AMF completes preparation of selecting the network slice, a Relocation Response message (Forward Relocation Response) may be sent to the MME, or the second AMF may send a message to the first AMF, and then the first AMF sends a Response message of the Relocation request message to the MME. And the response message of the relocation request message carries the identification information of the second AMF to inform the MME of the AMF finally selected for the terminal equipment, so that the MME continues to complete the switching of the network slice.
In summary, in the embodiments of the present invention, the subscription information of the terminal device is used to select the AMF, and the subscription information includes information of a network slice currently accessed by the terminal device, that is, the AMF is selected according to information of all PDN connection network slices currently accessed by the terminal device, so that the selected AMF can serve all PDN connections of the terminal device, thereby ensuring that all PDN connections of the terminal device can be migrated to the 5G network as much as possible.
In the embodiment of the invention, the terminal equipment does not need to associate the S-NSSAI with the default EPS bearer ID, the association of the S-NSSAI and the EPS bearer ID is not needed to be transmitted to the MME through the transparent container in the PDN connection establishment process, and the transparent container is transmitted to the AMF by the MME, so that the influence on the protocol and the flow of the EPC system is avoided.
In the embodiment of the present invention, for convenience of describing the whole flow, the flow shown in fig. 2 and fig. 3 is described by mixing the methods executed by the first AMF and the second AMF, but it should be understood that each of the first AMF and the second AMF can independently execute the corresponding method step.
The device provided by the embodiment of the invention is described in the following with the attached drawings of the specification.
Referring to fig. 5, based on the same inventive concept, an embodiment of the present invention provides an AMF, which may be the first AMF in the above description, including: memory 501, processor 502, and transceiver 505. The memory 501 and the transceiver 505 may be connected to the processor 502 through a bus interface (fig. 5 is taken as an example), or may be connected to the processor 502 through a dedicated connection line.
The memory 501 may be used for storing programs, and the transceiver 505 may be used for transceiving data under the control of the processor 502. The processor 502 may be configured to read the program in the memory 501 and execute the following processes:
receiving a relocation request message from the MME through the transceiver 503, wherein the relocation request message carries an identifier of the terminal device;
acquiring subscription information of the terminal equipment according to the identifier of the terminal equipment, wherein the subscription information comprises information of a network slice currently accessed by the terminal equipment;
and selecting a second AMF for the terminal equipment according to the information of the network slice currently accessed by the terminal equipment.
Optionally, the processor 502 is specifically configured to:
determining an S-NSSAI associated with a PDU session established by the terminal equipment according to the information of the network slice currently accessed by the terminal equipment;
and selecting a second AMF for the terminal equipment according to all S-NSSAIs associated with all PDU sessions currently established by the terminal equipment.
Optionally, the processor 502 is specifically configured to:
sending a request message to NSSF, wherein the request message carries all S-NSSAIs and is used for requesting the NSSF to select a second AMF for the terminal equipment;
receiving a feedback message from the NSSF, wherein the feedback message carries the identifier of the second AMF or carries an AMF set;
and if the feedback message carries the identifier of the second AMF, selecting the second AMF indicated by the feedback message, or if the feedback message carries the AMF set, selecting the second AMF from the AMF set.
Optionally, the processor 502 is further configured to:
determining from all S-NSSAIs that the first AMF is not capable of serving the plurality of network slices indicated by the S-NSSAI with which the terminal device is currently associated.
Optionally, the transceiver 503 is specifically configured to:
sending an acquisition message to the UDM and the HSS, wherein the acquisition message comprises an identifier of the terminal equipment and is used for acquiring subscription information of the terminal equipment;
subscription information from the UDM and HSS is received.
Optionally, the transceiver 503 is further configured to:
and sending a relocation reject response message to the MME, wherein the relocation reject response message carries the identification information of the second AMF so as to indicate the MME to send the relocation request message to the second AMF.
Optionally, the relocation reject response message includes subscription information, and the subscription information includes information of a network slice currently accessed by the terminal device.
Optionally, the transceiver 503 is further configured to:
and sending the relocation request message sent by the MME and the acquired information of the network slice currently accessed by the terminal equipment to the second AMF.
Alternatively, the processor 502 may be a central processing unit, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits for controlling program execution.
Where in fig. 5 the bus architecture may include any number of interconnected buses and bridges, in particular one or more processors represented by processor 502 and various circuits of memory represented by memory 501 are linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 503 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 302 is responsible for managing the bus architecture and general processing, and the memory 501 may store data associated with the processor 502 when performing operations.
Alternatively, the Memory 501 may include a Read Only Memory (ROM), a Random Access Memory (RAM), and a disk Memory. The memory 501 is used for storing data required by the processor 502 during operation, that is, storing instructions executable by the at least one processor 502, and the at least one processor 502 executes the method shown in fig. 3 or fig. 4 by executing the instructions stored in the memory 501. The number of the memories 501 is one or more. The memory 501 is shown in fig. 5, but it should be noted that the memory 501 is not an optional functional block, and is shown by a dotted line in fig. 5.
Referring to fig. 6, based on the same inventive concept, an embodiment of the present invention provides an AMF, which may be the first AMF in the foregoing, including: a receiving unit 601, an obtaining unit 602, and a selecting unit 603.
The receiving unit 601 may be configured to receive a relocation request message from a mobility management entity MME, where the relocation request message carries an identifier of a terminal device. The obtaining unit 602 may be configured to obtain subscription information of the terminal device according to the identifier of the terminal device, where the subscription information includes information of a network slice currently accessed by the terminal device. The selecting unit 603 may be configured to select the second AMF for the terminal device according to information of a network slice currently accessed by the terminal device.
Optionally, the selecting unit 603 is specifically configured to:
determining S-NSSAI associated with PDU session established by the terminal equipment according to the information of the network slice currently accessed by the terminal equipment;
and all S-NSSAIs associated with all PDU sessions currently established by the terminal equipment select a second AMF for the terminal equipment.
Optionally, the receiving unit 601 is specifically configured to:
sending a request message to NSSF, wherein the request message carries all S-NSSAIs and is used for requesting the NSSF to select a second AMF for the terminal equipment;
receiving a feedback message from the NSSF, wherein the feedback message carries the identifier of the second AMF or carries an AMF set;
the selecting unit 603 is specifically configured to: and if the feedback message carries the identifier of the second AMF, selecting the second AMF indicated by the feedback message, or if the feedback message carries the AMF set, selecting the second AMF from the AMF set.
Optionally, the selecting unit 603 is further configured to:
determining from all S-NSSAIs that the first AMF is not capable of serving the plurality of network slices indicated by the S-NSSAI with which the terminal device is currently associated.
Optionally, the receiving unit 601 is specifically configured to:
sending an acquisition message to the UDM and the HSS, wherein the acquisition message comprises an identifier of the terminal equipment and is used for acquiring subscription information of the terminal equipment;
subscription information from the UDM and HSS is received.
Optionally, the receiving unit 601 is further configured to:
and sending a relocation reject response message to the MME, wherein the relocation reject response message carries the identification information of the second AMF so as to indicate the MME to send the relocation request message to the second AMF.
Optionally, the relocation reject response message includes subscription information, where the subscription information includes information of a network slice currently accessed by the terminal device.
Optionally, the receiving unit 601 is further configured to:
and sending the relocation request message sent by the MME and the acquired information of the network slice currently accessed by the terminal equipment to the second AMF.
The physical devices corresponding to the receiving unit 601, the obtaining unit 602, and the selecting unit 603 may be the processor 502 or the transceiver 503. The AMF may be used to perform the method provided by the embodiment shown in fig. 3 or fig. 4. Therefore, regarding the functions that can be realized by each functional module in the device, reference may be made to the corresponding description in the embodiment shown in fig. 3 or fig. 4, which is not repeated herein.
Referring to fig. 7, based on the same inventive concept, an embodiment of the present invention provides an AMF, which may include: a memory 701, a processor 702, and a transceiver 707. The memory 701 and the transceiver 707 may be connected to the processor 702 through a bus interface (as shown in fig. 7 for example), or may be connected to the processor 702 through a dedicated connection line.
The memory 701 may be used for storing programs, and the transceiver 707 may be used for transceiving data under the control of the processor 702, among others. The processor 702 may be configured to read the program in the memory 701 and execute the following processes:
receiving relocation request information and receiving information of a network slice currently accessed by terminal equipment, wherein the relocation request information comprises an identifier of the terminal equipment, and the network slice information comprises single network slice selection auxiliary information S-NSSAI currently associated with a PDU session;
and aiming at the PDU session of the home routing, selecting V-SMF for the PDU session according to the S-NSSAI currently associated with the PDU session so as to complete the network slice selection aiming at the PDU session.
Optionally, the transceiver 703 is specifically configured to:
and receiving information of the network slice currently accessed by the terminal equipment from the first AMF, or receiving information of the network slice currently accessed by the terminal equipment from a Mobility Management Entity (MME).
Optionally, the transceiver 703 is further configured to:
and sending a response message of the relocation request message to the MME.
Alternatively, the processor 702 may be a central processing unit, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits for controlling program execution.
Wherein in fig. 7, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 702, and various circuits, represented by memory 701, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 703 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 302 is responsible for managing the bus architecture and general processing, and the memory 701 may store data associated with the processor 702 when performing operations.
Optionally, the Memory 701 may include a Read Only Memory (ROM), a Random Access Memory (RAM), and a disk Memory. The memory 701 is used for storing data required by the processor 702 during operation, that is, storing instructions executable by the at least one processor 702, and the at least one processor 702 executes the method shown in fig. 3 or fig. 4 by executing the instructions stored in the memory 701. The number of the memories 701 is one or more. The memory 701 is shown in fig. 7, but it should be noted that the memory 701 is not an optional functional block, and is shown by a dotted line in fig. 7.
Referring to fig. 8, based on the same inventive concept, an embodiment of the present invention provides an AMF, which may be the second AMF described above, including: a receiving unit 801 and a selecting unit 802.
The receiving unit 801 may be configured to receive a relocation request message and information of a network slice currently accessed by the terminal device, where the relocation request message includes an identifier of the terminal device, and the network slice information includes single network slice selection assistance information S-NSSAI currently associated with a PDU session. The selecting unit 802 may be configured to select V-SMF for a PDU session according to the S-NSSAI currently associated with the PDU session for the home routed PDU session, so as to complete network slice selection for the PDU session.
Optionally, the receiving unit 801 is specifically configured to:
and receiving information of the network slice currently accessed by the terminal equipment from the first AMF, or receiving information of the network slice currently accessed by the terminal equipment from a Mobility Management Entity (MME).
Optionally, the receiving unit 801 is further configured to:
and sending a response message of the relocation request message to the MME.
The physical devices corresponding to the receiving unit 801 and the selecting unit 802 may be the processor 702 or the transceiver 703. The AMF may be used to perform the methods provided by the embodiments shown in fig. 3 or fig. 4. Therefore, regarding the functions that can be realized by each functional module in the device, reference may be made to the corresponding description in the embodiment shown in fig. 3 or fig. 4, which is not repeated herein.
Based on the same inventive concept, embodiments of the present invention also provide a computer storage medium, wherein the computer storage medium stores computer instructions, which, when executed on a computer, cause the computer to perform the method as described in fig. 3 or fig. 4.
In some possible embodiments, various aspects of the AMF and network slice selection method provided by the present invention may also be implemented in the form of a program product including program code for causing a computer device to perform the steps of the AMF selection method according to various exemplary embodiments of the present invention described above in this specification when the program product is run on the computer device, for example, the computer device may perform the AMF selection method provided by the embodiments shown in fig. 2 to 4.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The program product for the selection method of the AMF of the embodiments of the present invention may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be run on a computing device. However, the program product of the present invention is not limited in this respect, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A readable signal medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device over any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., over the internet using an internet service provider).
It should be noted that although several units or sub-units of the apparatus are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, the features and functions of two or more of the units described above may be embodied in one unit, according to embodiments of the invention. Conversely, the features and functions of one unit described above may be further divided into embodiments by a plurality of units.
Moreover, while the operations of the method of the invention are depicted in the drawings in a particular order, this does not require or imply that the operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (6)

1. A method for selecting a network slice, comprising:
a second access and mobility management functional entity AMF receives a request message sent by a first AMF and receives information of a network slice currently accessed by a terminal device, wherein the information of the network slice comprises single network slice selection auxiliary information S-NSSAI currently associated with a PDU session, and the information of the network slice is fed back to the first AMF by a unified data management and home subscriber server according to an ID of the terminal device carried by an acquisition message after the first AMF sends the acquisition message to the unified data management and home subscriber server;
and aiming at the PDU session of the home routing, the second AMF selects a visited session management function entity V-SMF for the PDU session according to the S-NSSAI currently associated with the PDU session.
2. The method of claim 1, wherein the second AMF receives information of a network slice currently accessed by the terminal device, comprising:
and the second AMF receives the information of the network slice currently accessed by the terminal equipment from the first AMF, or receives the information of the network slice currently accessed by the terminal equipment from a Mobility Management Entity (MME).
3. An access and mobility management function, AMF, comprising:
a memory to store instructions;
a processor for reading the instructions in the memory and performing the following processes:
receiving a request message sent by a first AMF (advanced metering Filter) through a transceiver, and receiving information of a network slice currently accessed by a terminal device, wherein the information of the network slice comprises single network slice selection auxiliary information S-NSSAI currently associated with a PDU (protocol data Unit) session, and after the information of the network slice is obtained by the first AMF and sent to a unified data management and home subscriber server, the unified data management and home subscriber server feeds back to the first AMF according to an ID (identity) of the terminal device carried by the obtained message;
aiming at a PDU session of a home routing, selecting a visit place session management function entity V-SMF for the PDU session according to the S-NSSAI currently associated with the PDU session;
the transceiver is used for transceiving data under the control of the processor.
4. The AMF of claim 3, wherein the transceiver is specifically configured to:
receiving information of a network slice currently accessed by the terminal device from a first AMF, or receiving information of a network slice currently accessed by the terminal device from a Mobility Management Entity (MME).
5. An access and mobility management function, AMF, comprising:
a receiving unit, configured to receive a request message sent by a first AMF, and receive information of a network slice currently accessed by a terminal device, where the information of the network slice includes single network slice selection auxiliary information S-NSSAI currently associated with a PDU session, and the information of the network slice is fed back to the first AMF by a unified data management and home subscriber server according to an ID of the terminal device carried in an acquisition message after the first AMF sends the acquisition message to the unified data management and home subscriber server;
and the selection unit is used for selecting a visit place session management function entity V-SMF for the PDU session according to the S-NSSAI currently associated with the PDU session aiming at the PDU session routed by the home location.
6. A computer storage medium on which a computer program is stored, which computer program, when being executed by a processor, carries out the method of claim 1 or 2.
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