CN117015071A - Access switching method, AMF entity and communication system - Google Patents

Access switching method, AMF entity and communication system Download PDF

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Publication number
CN117015071A
CN117015071A CN202210460587.9A CN202210460587A CN117015071A CN 117015071 A CN117015071 A CN 117015071A CN 202210460587 A CN202210460587 A CN 202210460587A CN 117015071 A CN117015071 A CN 117015071A
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China
Prior art keywords
entity
access path
access
user terminal
plane tunnel
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Chinese (zh)
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刘玉冰
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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Priority to CN202210460587.9A priority Critical patent/CN117015071A/en
Priority to PCT/CN2023/091217 priority patent/WO2023208122A1/en
Publication of CN117015071A publication Critical patent/CN117015071A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/32—Release of transport tunnels

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

Abstract

The disclosure provides an access switching method, an AMF entity and a communication system. The access switching method comprises the following steps: according to a session establishment request sent by a user terminal through a first access path, sending a first indication to a UPF entity through an SMF entity so that the UPF entity establishes a first user plane tunnel by utilizing the first access path, thereby establishing a multi-access PDU session between the user terminal and a core network; under the condition that the access path switching condition is met, according to the path switching request sent by the user terminal, a second instruction is sent to the UPF entity through the SMF entity, so that the UPF entity establishes a second user plane tunnel by using a second access path; and sending a third indication to the UPF entity through the SMF entity so that the UPF entity releases the first user plane tunnel, thereby switching the multi-access PDU session from the first user plane tunnel to the second user plane tunnel. The present disclosure enables support for new types of MAPDU sessions.

Description

Access switching method, AMF entity and communication system
Technical Field
The present disclosure relates to the field of communications, and in particular, to an access handover method, an AMF (Access and Mobility Management Function ) entity, and a communication system.
Background
The multiple access PDU (Protocol Data Unit ) session supports simultaneously the UE (User Equipment) to establish the User plane resources of 3GPP (3 rd Generation Partnership Project, third generation partnership project) and non-3GPP access, i.e. to establish PDU session through both 3GPP access and non-3GPP access, wherein PDU session identities of both are the same.
Disclosure of Invention
The inventor notes that the existing specifications currently support a multiple access PDU session to access 5GC (5 g core,5g core network) through both a 3GPP access path and a non-3GPP access path, but do not support handover between accessing 5GC through both a trusted non-3GPP access path and a non-trusted non-3GPP access path, and a trusted non-3GPP access path and a non-trusted non-3GPP access path, which limits the application scenarios of multiple access PDU sessions.
Accordingly, the present disclosure provides an access switching method, so as to simultaneously support access to 5GC through a trusted non-3GPP access path and an untrusted non-3GPP access path, and switching between the trusted non-3GPP access path and the untrusted non-3GPP access path, thereby enriching an application scenario of fusing a fixed network and a mobile network, and thus fusing network resources better.
According to a first aspect of an embodiment of the present disclosure, there is provided an access handover method, performed by an AMF entity, including: according to a session establishment request sent by a user terminal through a first access path registered by the user terminal, sending a first indication to a UPF entity through an SMF entity so that the UPF entity establishes a first user plane tunnel by utilizing the first access path, thereby establishing a multi-access PDU session between the user terminal and a core network; under the condition that the access path switching condition is met, according to the path switching request sent by the user terminal, sending a second instruction to the UPF entity through the SMF entity so that the UPF entity can establish a second user plane tunnel by utilizing a second access path registered by the user terminal; and sending a third instruction to the UPF entity through the SMF entity so that the UPF entity releases the first user plane tunnel, thereby switching the multi-access PDU session from the first user plane tunnel to the second user plane tunnel.
In some embodiments, the multiple access PDU session identity of the first user plane tunnel and the second user plane tunnel are the same.
In some embodiments, the first access path and the second access path are registered for the user terminal according to a registration request sent by the user terminal.
In some embodiments, the first access path is one of a trusted non-3GPP access path and an untrusted non-3GPP access path; the second access path is the other of the trusted non-3GPP access path and the untrusted non-3GPP access path.
According to a second aspect of embodiments of the present disclosure, there is provided an AMF entity comprising: a first processing module configured to send a first indication to a UPF entity through an SMF entity according to a session establishment request sent by a user terminal through a first access path registered by the user terminal, so that the UPF entity establishes a first user plane tunnel by using the first access path, thereby establishing a multi-access PDU session between the user terminal and a core network; the second processing module is configured to send a second instruction to the UPF entity through the SMF entity according to the path switching request sent by the user terminal under the condition that the access path switching condition is met, so that the UPF entity establishes a second user plane tunnel by using a second access path registered by the user terminal; and a third processing module configured to send, by the SMF entity, a third indication to the UPF entity, so that the UPF entity releases the first user plane tunnel, thereby switching the multi-access PDU session from the first user plane tunnel to the second user plane tunnel.
In some embodiments, the multiple access PDU session identity of the first user plane tunnel and the second user plane tunnel are the same.
In some embodiments, the AMF entity further comprises: and the fourth processing module is configured to register the first access path and the second access path for the user terminal according to the registration request sent by the user terminal.
In some embodiments, the first access path is one of a trusted non-3GPP access path and an untrusted non-3GPP access path; the second access path is the other of the trusted non-3GPP access path and the untrusted non-3GPP access path.
According to a third aspect of embodiments of the present disclosure, there is provided an AMF entity comprising: a memory configured to store instructions; a processor coupled to the memory, the processor configured to perform a method according to any of the embodiments described above based on instructions stored in the memory.
According to a fourth aspect of embodiments of the present disclosure, there is provided a communication system comprising: an AMF entity as in any one of the embodiments above; a user terminal configured to send a session establishment request to the AMF entity through a first access path registered by the user terminal; sending a path switching request to the AMF entity under the condition that the access path switching condition is met; a UPF entity configured to establish a first user plane tunnel by using the first access path according to a first indication sent by the AMF entity through the SMF entity, thereby establishing a multi-access PDU session between the user terminal and a core network; establishing a second user plane tunnel by using a second access path registered by the user terminal according to a second indication sent by the AMF entity through the SMF entity; and releasing the first user plane tunnel according to a third instruction sent by the AMF entity through the SMF entity, so as to switch the multi-access PDU session from the first user plane tunnel to the second user plane tunnel.
In some embodiments, the above system further comprises a PCF entity configured to update rules of the multiple access PDU session according to a fourth indication sent by the SMF entity.
In some embodiments, the rules for the multi-access PDU session include a first rule related to an upstream of the multi-access PDU session and a second rule related to a downstream of the multi-access PDU session.
In some embodiments, the first rule is an access traffic selection, handover and split ats rule; the second rule is an N4 interface rule between the SMF entity and the UPF entity.
In some embodiments, the user terminal is configured to send a registration request to the AMF entity to register the first access path and the second access path.
According to a fifth aspect of embodiments of the present disclosure, there is provided a non-transitory computer readable storage medium, wherein the computer readable storage medium stores computer instructions that, when executed by a processor, implement a method as in any of the embodiments described above.
Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments of the disclosure, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present disclosure, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a flow chart of an access handover method according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of an AMF entity according to one embodiment of the present disclosure;
FIG. 3 is a schematic diagram of an AMF entity according to another embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an AMF entity according to yet another embodiment of the disclosure;
fig. 5 is a schematic structural diagram of a communication system according to an embodiment of the present disclosure;
fig. 6 is a flowchart illustrating an access handover method according to another embodiment of the present disclosure.
Detailed Description
The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless it is specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Fig. 1 is a flow chart illustrating an access handover method according to an embodiment of the present disclosure. In some embodiments, the following access handover method is performed by the AMF entity.
In step 101, according to a session establishment request sent by the user terminal through a first access path registered by the user terminal, a first indication is sent to a UPF (User Plane Function ) entity through an SMF (Service Management Function ) entity, so that the UPF entity establishes a first user plane tunnel using the first access path, thereby establishing a multi-access PDU session between the user terminal and the core network.
In some embodiments, the first access path and the second access path are registered for the user terminal according to a registration request sent by the user terminal.
For example, the first access path is one of a trusted non-3GPP access path and an untrusted non-3GPP access path, and the second access path is the other of the trusted non-3GPP access path and the untrusted non-3GPP access path.
In step 102, if the access path switching condition is satisfied, according to the path switching request sent by the user terminal, a second instruction is sent to the UPF entity by the SMF entity, so that the UPF entity establishes a second user plane tunnel by using a second access path registered by the user terminal.
In some embodiments, the multiple access PDU session identity of the first user plane tunnel and the second user plane tunnel are the same.
In some embodiments, the network side device (e.g., PMF (Performance Monitoring Function, performance monitoring function) in the UPF entity) or the user terminal side may trigger an access path switch.
In step 103, a third indication is sent by the SMF entity to the UPF entity, such that the UPF entity releases the first user plane tunnel, thereby switching the multi-access PDU session from the first user plane tunnel to the second user plane tunnel.
In the access switching method provided by the embodiment of the disclosure, after the UE establishes a multi-access PDU session through one non-3GPP access path and triggers an access switching condition, the UE establishes a user plane tunnel through another non-3GPP access path, and triggers and releases the user plane tunnel of the initial non-3GPP access path by the network, so as to better adapt to the current multi-access PDU session, thereby realizing the support of a new type of MA PDU session.
Fig. 2 is a schematic structural diagram of an AMF entity according to an embodiment of the disclosure. As shown in fig. 2, the AMF entity comprises a first processing module 21, a second processing module 22 and a third processing module 23.
The first processing module 21 is configured to send a first indication to the UPF entity through the SMF entity according to a session establishment request sent by the user terminal through a first access path registered by the user terminal, so that the UPF entity establishes a first user plane tunnel using the first access path, thereby establishing a multi-access PDU session between the user terminal and the core network.
The second processing module 22 is configured to send, by the SMF entity, a second indication to the UPF entity in accordance with the path switch request sent by the user terminal, in case the access path switch condition is met, so that the UPF entity establishes a second user plane tunnel using a second access path registered by the user terminal.
In some embodiments, the multiple access PDU session identity of the first user plane tunnel and the second user plane tunnel are the same.
In some embodiments, the network side device (e.g., PMF in UPF entity) or user terminal side may trigger access path switching.
The third processing module 23 is configured to send a third indication to the UPF entity via the SMF entity, such that the UPF entity releases the first user plane tunnel, thereby switching the multi-access PDU session from the first user plane tunnel to the second user plane tunnel.
Fig. 3 is a schematic structural diagram of an AMF entity according to another embodiment of the disclosure. Fig. 3 differs from fig. 2 in that in the embodiment shown in fig. 3, the AMF entity further comprises a fourth processing module 24.
The fourth processing module 24 is configured to register the first access path and the second access path for the user terminal according to a registration request sent by the user terminal.
For example, the first access path is one of a trusted non-3GPP access path and an untrusted non-3GPP access path, and the second access path is the other of the trusted non-3GPP access path and the untrusted non-3GPP access path.
Fig. 4 is a schematic structural diagram of an AMF entity according to another embodiment of the disclosure. As shown in fig. 4, the AMF entity includes a memory 41 and a processor 42.
The memory 41 is for storing instructions and the processor 42 is coupled to the memory 41, the processor 42 being configured to perform a method as referred to in any of the embodiments of fig. 1 based on the instructions stored by the memory.
As shown in fig. 4, the AMF entity further comprises a communication interface 43 for information interaction with other devices. Meanwhile, the AMF entity further comprises a bus 44, and the processor 42, the communication interface 43, and the memory 41 perform communication with each other through the bus 44.
The memory 41 may comprise a high-speed RAM memory or may further comprise a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 41 may also be a memory array. The memory 41 may also be partitioned and the blocks may be combined into virtual volumes according to certain rules.
Further, the processor 42 may be a central processing unit CPU, or may be an application specific integrated circuit ASIC, or one or more integrated circuits configured to implement embodiments of the present disclosure.
The present disclosure also relates to a computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement a method as referred to in any of the embodiments of fig. 1.
Fig. 5 is a schematic structural diagram of a communication system according to an embodiment of the present disclosure. As shown in fig. 6, the communication system includes a user terminal 51, an AMF entity 52, an SMF entity 53, and a UPF entity 54. The AMF entity 52 is an AMF entity according to any one of the embodiments of fig. 2 to 4.
The user terminal 51 is configured to send a session establishment request to the AMF entity 52 over a first access path where the user terminal 51 is registered; in the case where the access path switching condition is satisfied, a path switching request is sent to the AMF entity 52.
The UPF entity 54 is configured to establish a multi-access PDU session between the user terminal and the core network by establishing a first user plane tunnel using the first access path according to a first indication sent by the AMF entity 52 via the SMF entity 53; establishing a second user plane tunnel by using a second access path registered by the user terminal 51 according to a second instruction sent by the AMF entity 52 through the SMF entity 53; according to a third indication sent by the AMF entity 52 via the SMF entity 53, the first user plane tunnel is released, whereby the multi-access PDU session is switched from the first user plane tunnel to the second user plane tunnel. In some embodiments, the user terminal 51 is configured to send a registration request to the AMF entity 52 in order to register the first access path and the second access path.
In some embodiments, as shown in fig. 5, the system further comprises a PCF (Policy Control Function ) entity 55.PCF entity 55 is configured to update the rules of the multiple access PDU session based on the fourth indication sent by SMF entity 53.
In some embodiments, the rules for the multiple access PDU session include a first rule related to an upstream of the multiple access PDU session and a second rule related to a downstream of the multiple access PDU session.
For example, the first rule is an ats ss (Access Traffic Steering, switching and Splitting, access traffic selection, handoff, and offloading) rule, and the second rule is an N4 interface rule between an SMF entity and a UPF entity.
Fig. 6 is a flowchart illustrating an access handover method according to another embodiment of the present disclosure.
In step 601, the user terminal sends a registration request to the AMF entity through an N3IWF (Non-3 GPP InterWorking Function )/TNGF (Trusted Non-3GPP Gateway Function, trusted Non-3GPP gateway function) entity.
The AMF entity registers a first access path and a second access path for the user terminal.
For example, the first access path is one of a trusted non-3GPP access path and an untrusted non-3GPP access path, and the second access path is the other of the trusted non-3GPP access path and the untrusted non-3GPP access path.
In step 602, the user terminal sends a session establishment request to the AMF entity through the N3IWF/TNGF entity using a first access path registered by the user terminal, and the AMF entity sends a first indication to the UPF entity through the SMF entity, so that the UPF entity establishes a first user plane tunnel using the first access path, thereby establishing a multi-access PDU session between the user terminal and the core network.
In step 603, if the access path switching condition is met, the ue sends a path switching request to the AMF entity through the N3IWF/TNGF entity, and the AMF entity sends a second indication to the UPF entity through the SMF entity, so that the UPF entity establishes a second user plane tunnel using a second access path registered by the ue.
In some embodiments, the multiple access PDU session identity of the first user plane tunnel and the second user plane tunnel are the same.
In some embodiments, the network side device (e.g., PMF in UPF entity) or user terminal side may trigger access path switching.
In step 604, the amf entity sends a third indication to the UPF entity via the SMF entity, such that the UPF entity releases the first user plane tunnel.
In step 605, the smf entity sends a fourth indication to the PCF entity, so that the PCF entity updates rules for the multi-access PDU session, thereby switching the multi-access PDU session from the first user plane tunnel to the second user plane tunnel.
In some embodiments, the rules for the multiple access PDU session include a first rule related to an upstream of the multiple access PDU session and a second rule related to a downstream of the multiple access PDU session.
For example, the first rule is an ats ss rule and the second rule is an N4 interface rule between the SMF entity and the UPF entity.
In some embodiments, the functional units described above may be implemented as general-purpose processors, programmable logic controllers (Programmable Logic Controller, abbreviated as PLCs), digital signal processors (Digital Signal Processor, abbreviated as DSPs), application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASICs), field programmable gate arrays (Field-Programmable Gate Array, abbreviated as FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described in the present disclosure.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (15)

1. An access handover method performed by an AMF entity, comprising:
according to a session establishment request sent by a user terminal through a first access path registered by the user terminal, sending a first indication to a UPF entity through an SMF entity so that the UPF entity establishes a first user plane tunnel by utilizing the first access path, thereby establishing a multi-access PDU session between the user terminal and a core network;
under the condition that the access path switching condition is met, according to the path switching request sent by the user terminal, sending a second instruction to the UPF entity through the SMF entity so that the UPF entity can establish a second user plane tunnel by utilizing a second access path registered by the user terminal;
and sending a third instruction to the UPF entity through the SMF entity so that the UPF entity releases the first user plane tunnel, thereby switching the multi-access PDU session from the first user plane tunnel to the second user plane tunnel.
2. The method of claim 1, wherein,
and the multi-access PDU session identifiers of the first user plane tunnel and the second user plane tunnel are the same.
3. The method according to any one of claims 1-2, wherein,
and registering a first access path and a second access path for the user terminal according to the registration request sent by the user terminal.
4. The method of claim 3, wherein,
the first access path is one of a trusted non-3GPP access path and an untrusted non-3GPP access path;
the second access path is the other of the trusted non-3GPP access path and the untrusted non-3GPP access path.
5. An AMF entity comprising:
a first processing module configured to send a first indication to a UPF entity through an SMF entity according to a session establishment request sent by a user terminal through a first access path registered by the user terminal, so that the UPF entity establishes a first user plane tunnel by using the first access path, thereby establishing a multi-access PDU session between the user terminal and a core network;
the second processing module is configured to send a second instruction to the UPF entity through the SMF entity according to the path switching request sent by the user terminal under the condition that the access path switching condition is met, so that the UPF entity establishes a second user plane tunnel by using a second access path registered by the user terminal;
and a third processing module configured to send, by the SMF entity, a third indication to the UPF entity, so that the UPF entity releases the first user plane tunnel, thereby switching the multi-access PDU session from the first user plane tunnel to the second user plane tunnel.
6. The AMF entity of claim 5, wherein,
and the multi-access PDU session identifiers of the first user plane tunnel and the second user plane tunnel are the same.
7. The AMF entity of any one of claims 5-6, further comprising:
and the fourth processing module is configured to register the first access path and the second access path for the user terminal according to the registration request sent by the user terminal.
8. The AMF entity of claim 7, wherein,
the first access path is one of a trusted non-3GPP access path and an untrusted non-3GPP access path;
the second access path is the other of the trusted non-3GPP access path and the untrusted non-3GPP access path.
9. An AMF entity comprising:
a memory configured to store instructions;
a processor coupled to the memory, the processor configured to perform the method of any of claims 1-4 based on instructions stored by the memory.
10. A communication system, comprising:
the AMF entity of any one of claims 5-9;
a user terminal configured to send a session establishment request to the AMF entity through a first access path registered by the user terminal; sending a path switching request to the AMF entity under the condition that the access path switching condition is met;
a UPF entity configured to establish a first user plane tunnel by using the first access path according to a first indication sent by the AMF entity through the SMF entity, thereby establishing a multi-access PDU session between the user terminal and a core network; establishing a second user plane tunnel by using a second access path registered by the user terminal according to a second indication sent by the AMF entity through the SMF entity; and releasing the first user plane tunnel according to a third instruction sent by the AMF entity through the SMF entity, so as to switch the multi-access PDU session from the first user plane tunnel to the second user plane tunnel.
11. The system of claim 10, further comprising:
and the PCF entity is configured to update the rules of the multi-access PDU session according to the fourth indication sent by the SMF entity.
12. The AMF entity of claim 11, wherein,
the rules for the multiple access PDU session include a first rule related to an upstream of the multiple access PDU session and a second rule related to a downstream of the multiple access PDU session.
13. The AMF entity of claim 12, wherein,
the first rule is an access traffic selection, switching and splitting ATSSS rule;
the second rule is an N4 interface rule between the SMF entity and the UPF entity.
14. The system of claim 10, wherein,
the user terminal is configured to send a registration request to the AMF entity for registering the first access path and the second access path.
15. A non-transitory computer readable storage medium storing computer instructions which, when executed by a processor, implement the method of any one of claims 1-4.
CN202210460587.9A 2022-04-28 2022-04-28 Access switching method, AMF entity and communication system Pending CN117015071A (en)

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CN111436087B (en) * 2019-01-15 2021-09-10 大唐移动通信设备有限公司 PDU session switching method and device
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