CN114449590B

CN114449590B - Session creation method and device

Info

Publication number: CN114449590B
Application number: CN202011112245.5A
Authority: CN
Inventors: 王俊杰; 文振忠
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2023-08-18
Anticipated expiration: 2040-10-16
Also published as: CN114449590A

Abstract

The embodiment of the application provides a session creation method and a session creation device. The method is applied to core network equipment, and comprises the following steps: receiving a session creation request for a target terminal sent by a network element of a mobility management entity, and acquiring a first evolved packet system bearer identifier (EBI) of the target terminal; the first EBI is allocated for the target terminal by the access and mobility management function network element; releasing a first session corresponding to the first EBI and deleting session resources of the first session; and creating a second session for the target terminal, wherein the second session is the session requested by the session creation request. The embodiment of the application solves the problem that in the prior art, the terminal easily causes EBI resource conflict in the abnormal switching scene in the 5G network.

Description

Session creation method and device

Technical Field

The present application relates to the field of mobile communications technologies, and in particular, to a method and an apparatus for creating a session.

Background

With the rapid development of mobile communication technology, a fifth generation mobile communication network (5th Generation Mobile Networks,5G) has been developed. The 5G not only can change the existing living and working modes of the user and improve the communication efficiency, but also can increase the possibility of landing a plurality of front edge technologies and products. The 5G network has three characteristics of extremely high speed, extremely high capacity and extremely low time delay, and the peak theoretical transmission speed can reach tens of GB (gigabytes) per second, which is hundreds of times faster than the transmission speed of LTE.

The 5G network should support not only more data but also more usage. In the use of 5G networks, improving end-to-end performance would be an important issue. In particular, the end-to-end capability refers to a condition in which connection is maintained between a wireless network of the mobile terminal and a server searching for information.

However, for a considerable period of time, the 5G network will be in a transitional phase; in the transition phase, the 5G network is allowed to coexist with the long term evolution (Long Term Evolution, LTE, 4G network), so that the terminal needs to switch between the 5G network and the LTE; in the switching process, the switching is realized through the interoperation. However, for an abnormal handover scenario of the terminal in the 5G network, i.e. a scenario where LTE is not accessed through interoperability, such as a scenario where the terminal is in a coverage hole of the 5G network or is powered off due to power exhaustion, a situation where an evolved packet system bearer identity (Evolved Packet System Bearer Id, EBI) resource conflict easily occurs. Specifically, in a network architecture where a 5G network and LTE coexist, a protocol data unit (Protocol Data Unit, PDU) session in the 5G network may be migrated to an evolved packet system (Evolved Packet System, EPS), and a packet data network (Packet Data Network, PDN) connection corresponding to the PDU session is established in the EPS, and accordingly, a quality of service (Quality Of Service, qoS) flow in the PDU session may map an EPS Bearer (EPS Bearer) in the PDN connection, so an EBI needs to be allocated to the EPS Bearer mapped in the EPS by the QoS flow to indicate a mapping relationship between the EPS Bearer and the QoS flow. If the EBI resource conflict occurs, the terminal cannot Attach (Attach) in LTE, which affects normal communication of the terminal.

Disclosure of Invention

The embodiment of the application provides a session creation method and a session creation device, which are used for solving the problem that in the prior art, an abnormal switching scene of a terminal in a 5G network is easy to cause EBI resource conflict.

In one aspect, an embodiment of the present application provides a session creation method, applied to a core network device, where the method includes:

receiving a session creation request for a target terminal sent by a network element of a mobility management entity, and acquiring a first evolved packet system bearer identifier (EBI) of the target terminal; the first EBI is allocated for the target terminal by the access and mobility management function network element;

releasing a first session corresponding to the first EBI and deleting session resources of the first session;

and creating a second session for the target terminal, wherein the second session is the session requested by the session creation request.

Optionally, the releasing the first session corresponding to the first EBI and deleting the session resource of the first session includes:

sending first indication information to a user plane function network element corresponding to the first session, wherein the first indication information indicates the user plane function network element to release the first session;

and receiving first response information which is sent by the user plane function network element and aims at the first indication information, and deleting session resources of the first session.

Optionally, the sending the first indication information to the user plane function network element corresponding to the first session includes:

and sending first indication information to the user plane function network element corresponding to the first session through a transmission interface between the core network equipment and the user plane function network element.

acquiring a second EBI of the second session carried in the session creation request;

and if the second EBI is the same as the first EBI, releasing the first session corresponding to the first EBI and deleting the session resource of the first session.

Optionally, after the obtaining the first evolved packet system bearer identifier EBI of the target terminal, the method includes:

and if the first EBI does not exist, creating the second session for the target terminal.

On the other hand, the embodiment of the application also provides a session creation device, which is applied to core network equipment, and the device comprises:

a request receiving module, configured to receive a session creation request for a target terminal sent by a mobility management entity network element, and obtain a first evolved packet system bearer identifier EBI of the target terminal; the first EBI is allocated for the target terminal by the access and mobility management function network element;

a session releasing module, configured to release a first session corresponding to the first EBI and delete a session resource of the first session;

and the session creation module is used for creating a second session for the target terminal, wherein the second session is the session requested by the session creation request.

Optionally, the session release module includes:

a sending sub-module, configured to send first indication information to a user plane function network element corresponding to the first session, where the first indication information indicates the user plane function network element to release the first session;

and the receiving sub-module is used for receiving the first response information aiming at the first indication information and deleting the session resource of the first session, wherein the first response information is sent by the user plane function network element.

Optionally, the sending submodule is configured to:

Optionally, the session release module includes:

an obtaining sub-module, configured to obtain a second EBI of the second session carried in the session creation request;

and the releasing submodule is used for releasing the first session corresponding to the first EBI and deleting the session resource of the first session if the second EBI is the same as the first EBI.

Optionally, the apparatus comprises:

and the creation module is used for creating the second session for the target terminal if the first EBI does not exist.

In yet another aspect, an embodiment of the present application further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps in the session creation method as described above when executing the computer program.

In yet another aspect, embodiments of the present application also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps in the session creation method as described above.

In the embodiment of the application, core network equipment receives a session creation request for a target terminal sent by a mobility management entity network element, and acquires a first evolved packet system bearer identifier (EBI) of the target terminal; releasing a first session corresponding to the first EBI, deleting session resources of the first session, and finally creating a second session for the target terminal, so that the target terminal can be successfully accessed in LTE, and the situation that the target terminal cannot be attached in LTE due to EBI resource conflict, so that the target terminal cannot access the network, is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flowchart of steps of a session creation method according to an embodiment of the present application;

FIG. 2 is a scene graph of a first example of an embodiment of the application;

fig. 3 is a block diagram of a session creation apparatus according to an embodiment of the present application;

fig. 4 is a block diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In various embodiments of the present application, it should be understood that the sequence numbers of the following processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application may be practiced otherwise than as specifically illustrated or described herein. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

In the embodiments provided herein, it should be understood that "b corresponding to a" means that b is associated with a, from which b can be determined. It should also be understood that determining b from a does not mean determining b from a alone, but may also determine b from a and/or other information.

The method and the device are based on the same application, and because the principles of solving the problems by the method and the device are similar, the implementation of the device and the method can be referred to each other, and the repetition is not repeated.

In addition, the technical scheme provided by the embodiment of the application can be suitable for various systems, especially 5G systems. For example, suitable systems may be global system for mobile communications (Global System Of Mobile Communication, GSM), code division multiple access (Code Division Multiple Access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet Radio service (General Packet Radio Service, GPRS), long term evolution (Long Term Evolution, LTE), LTE frequency division duplex (Frequency Division Duplex, FDD), LTE time division duplex (Time Division Duplex, TDD), long term evolution-advanced (Long Term Evolution Advanced, LTE-a), universal mobile system (Universal Mobile Telecommunication System, UMTS), worldwide interoperability for microwave access (Worldwide Interoperability for Microwave Access, WIMAX), 5G New air interface (New Radio, NR), and the like. The various systems each comprise a terminal and network equipment, wherein the network equipment comprises access network equipment and core network equipment, and the systems can also comprise core network parts, such as an evolved packet system (Evolved Packet System, EPS), a 5G system (5 GS) and the like.

The applicant found that for an abnormal handover scenario of a terminal in a 5G network, i.e. without accessing LTE through interoperability, the problem of EBI resource conflict is easily caused. For example, in a scenario where a terminal establishes a 5G session after a 5G network access, a session management function network element (Session Management Function, SMF) requests EBI, and an access and mobility management function network element (Access And Mobility Management Function, AMF) allocates EBI from 5 according to a protocol rule, when the terminal is in a coverage hole of the 5G network or is powered off due to power consumption, the terminal is not in a registration process or a session release process on the 5G side network, and is in LTE access, which causes abnormal handover. In the Attach (Attach) procedure of LTE, the mobility management entity (Mobility Management Entity, MME) allocates EBI for the terminal also starts from 5; at this time, the core network device discovers that the two EBIs the same, a session instance will not be created in LTE for the target terminal any more, and resource conflict will cause the terminal to fail to attach in LTE, and cannot surf the internet. Therefore, in the embodiment of the application, a session creation method is provided to solve the problem of EBI resource conflict.

As shown in fig. 1, an embodiment of the present application provides a session creation method, which is applicable to a core network device, and includes:

step 101, receiving a session creation request for a target terminal sent by a mobility management entity network element, and obtaining a first evolved packet system bearer identifier (EBI) of the target terminal; the first EBI is allocated for the target terminal by the access and mobility management function network element.

In the embodiment of the application, the core network device is used as a device shared by the 5G network and the LTE and is used for processing the operations of session creation, session management (such as deletion management and modification management) and the like of the terminal in the 5G network and the LTE. The core network equipment can not only provide the session management function of the EPS, but also provide the session management function of the 5G.

The core network device receives a session creation request for creating a session for a target terminal, wherein the session creation request is used for creating the session of the target terminal in LTE. For example, if the terminal sends an attach request to the access network device and requests to access LTE, the MME sends a session creation request to the core network device through a Service Gateway (SGW).

After receiving the session creation request, the core network device obtains a first EBI of the target terminal, where the first EBI is allocated to the target terminal by the AMF network element, and according to the foregoing, it can be known that, when the target terminal establishes the 5G session, the AMF network element allocates an EBI (that is, the first EBI) from 5 (or other values, which may be changed according to the change of the communication protocol) according to the existing communication protocol rule; therefore, if the target terminal is configured with the first EBI, it is indicated that the target terminal has a 5G session that is not released, or the target terminal does not perform the deregistration process in 5G, the LTE is connected through the abnormal handover.

As a first example, referring to fig. 2, in fig. 2, taking a core network device as a convergence device (Packet Gateway-C/Session Management Function, PGW-C/SMF) of a Gateway control plane entity of a Packet data network and a session management function network element as an example, in a scenario of abnormal handover, a terminal (UE) performs step 1, and first sends an Attach Request (Attach Request) to a base station (ENB, an access network device of LTE);

the ENB executes the step 2 and forwards the attach Request to the MME;

the MME performs step 3, sending a location update request (Update Location Request) to the user home server (Home Subscriber Server, HSS);

the HSS performs step 4, feeding back a location update acknowledgement to the MME (Update Location Ack). The MME performs the step 5 and sends a session creation request to the SGW (Create Session Request);

the SGW executes step 6 and forwards the session creation request to the PGW-C/SMF fusion device (Create Session Request);

the PGW-C/SMF fusion equipment receives the session creation request and acquires the first EBI of the target terminal.

Step 102, releasing the first session corresponding to the first EBI and deleting the session resource of the first session.

Optionally, the first session is a 5G session; the core network device determines that the target terminal has a 5G session which is not released, or after the target terminal does not execute abnormal switching operations such as deregistration processing in 5G, the first session corresponding to the first EBI is released, and session resources of the first session are deleted (or covered) so as to release the occupation of the first EBI by the first session, so that the core network device creates an LTE session for the target terminal, and the LTE attachment is realized.

Referring to fig. 2, after step 6, the PGW-C/SMF fusion device performs step 7, and sends a session release request (Session Release Request) to the user plane function network element (User Plane Function, UPF) through the n4 interface;

the UPF responds to the session release request and performs step 8, feeding back the session release response to the PGW-C/SMF convergence device (Session Release Response).

And the PGW-C/SMF fusion device executes the step 9 and deletes the session resources of the first session.

And executing the LTE attachment flow of the UE.

And step 103, creating a second session for the target terminal, wherein the second session is the session requested by the session creation request.

After deleting the session resources of the first session, the core network device executes access of the target terminal in LTE, and creates a second session in LTE for the target terminal, so that the target terminal normally accesses network communication, and the situation of resource conflict is avoided.

In the embodiment of the application, core network equipment receives a session creation request for a target terminal sent by a mobility management entity network element, and acquires a first evolved packet system bearer identifier (EBI) of the target terminal; releasing a first session corresponding to the first EBI, deleting session resources of the first session, and finally creating a second session for the target terminal, so that the target terminal can be successfully accessed in LTE, and the situation that the target terminal cannot be attached in LTE due to EBI resource conflict, so that the target terminal cannot access the network, is avoided. The embodiment of the application solves the problem that in the prior art, the terminal easily causes EBI resource conflict in the abnormal switching scene of the 5G network.

In an optional embodiment, the releasing the first session corresponding to the first EBI and deleting the session resource of the first session includes:

sending first indication information to a user plane function network element corresponding to the first session, wherein the first indication information indicates the user plane function network element to release the first session; optionally, the first indication information may be sent to the UPF network element through the n4 interface, so as to instruct the UPF network element to release the first session, so that the core network device establishes a second session for the target terminal;

The first response message, i.e. session release response message, in combination with fig. 2, after the upf network element receives the session release request, the upf network element responds to the session release request, releases the first session and executes step 8, and feeds back the session release response to the PGW-C/SMF fusion device (Session Release Response). After the core network device receives the first response information, the core network device determines that the UPF network element finishes releasing the first session, and then deletes the session resource of the first session.

In an optional embodiment, the sending the first indication information to the user plane function network element corresponding to the first session includes:

and sending first indication information to the user plane function network element corresponding to the first session through a transmission interface between the core network equipment and the user plane function network element. Alternatively, the transmission interface may be an N4 interface, where the N4 interface is a reference point between the SMF network element and the UPF network element.

acquiring a second EBI of the second session carried in the session creation request; the second session is a session requested to be created by a session creation request, namely an LTE session; optionally, the second EBI is allocated for the terminal by the MME; normally, the allocation of EBI for the terminal by the MME starts with numeral 5; and the AMF allocates EBI to the terminal, starting from numeral 5, if the second EBI is the same as the first EBI, the core network device will not create a session instance in LTE for the target terminal any more, so the core network device releases the first session corresponding to the first EBI and deletes the session resource of the first session, so as to create a session instance in LTE for the target terminal.

In an alternative embodiment, after the obtaining the first evolved packet system bearer identification EBI of the target terminal, the method includes:

and if the first EBI does not exist, creating the second session for the target terminal. That is, if the target terminal does not currently have a 5G session, an LTE session is directly created for the target terminal.

Having described the session creation method provided by the embodiment of the present application, the session creation device provided by the embodiment of the present application will be described below with reference to the accompanying drawings.

Referring to fig. 3, the embodiment of the present application further provides a session creation apparatus, which is applied to a core network device, and the apparatus includes:

a request receiving module 301, configured to receive a session creation request for a target terminal sent by a mobility management entity network element, and obtain a first evolved packet system bearer identifier EBI of the target terminal; the first EBI is allocated for the target terminal by the access and mobility management function network element.

the ENB executes the step 2 and forwards the attach Request to the MME;

And the session releasing module 302 is configured to release the first session corresponding to the first EBI and delete the session resource of the first session.

And executing the LTE attachment flow of the UE.

A session creation module 303, configured to create a second session for the target terminal, where the second session is a session requested by the session creation request.

Optionally, in an embodiment of the present application, the session release module 302 includes:

Optionally, in an embodiment of the present application, the sending submodule is configured to:

Optionally, in an embodiment of the present application, the apparatus includes:

It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice. In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a Processor (Processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory), a RAM, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

It should be noted that, the above device provided in the embodiment of the present application can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in this embodiment are omitted.

In the embodiment of the present application, a request receiving module 301 receives a session creation request for a target terminal sent by a mobility management entity network element, and obtains a first evolved packet system bearer identifier EBI of the target terminal; the session releasing module 302 releases the first session corresponding to the first EBI and deletes the session resource of the first session, and finally the session creating module 303 creates a second session for the target terminal, so as to enable the target terminal to successfully access in LTE, and avoid that the target terminal cannot attach in LTE due to EBI resource conflict, so that the target terminal cannot access the network.

In another aspect, an embodiment of the present application further provides an electronic device, including a memory, a processor, a bus, and a computer program stored in the memory and capable of running on the processor, where the processor implements the steps in the session creation method described above when executing the program.

For example, fig. 4 shows a schematic physical structure of an electronic device.

As shown in fig. 4, the electronic device may include: processor (Processor) 410, communication interface (Communications Interface) 420, memory (Memory) 430, and communication bus 440, wherein Processor 410, communication interface 420, and Memory 430 communicate with each other via communication bus 440. The processor 410 may call logic instructions in the memory 430 to perform the following method:

Further, the logic instructions in the memory 430 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

In still another aspect, an embodiment of the present application further provides a computer readable storage medium having stored thereon a computer program, which when executed by a processor is implemented to perform the session creation method provided in the above embodiments, for example, including:

The computer readable storage medium may be any available medium or data storage device that can be accessed by a processor including, but not limited to, magnetic storage (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (Mo), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor storage (e.g., ROM, EPROM, EEPROM, nonvolatile storage (Nand Flash), solid State Disk (SSD)), etc.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. 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-executable instructions. These computer-executable 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 processor-executable instructions may also be stored in a processor-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 processor-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 processor-executable 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.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A session creation method applied to a core network device, the method comprising:

2. The method for creating a session according to claim 1, wherein said releasing the first session corresponding to the first EBI and deleting the session resources of the first session comprises:

3. The session creation method according to claim 2, wherein the sending the first indication information to the user plane function network element corresponding to the first session includes:

4. The method of claim 1, wherein releasing the first session corresponding to the first EBI and deleting the session resources of the first session comprises:

5. The session creation method according to claim 1, wherein after the obtaining of the first evolved packet system bearer identity EBI of the target terminal, the method comprises:

6. A session creation apparatus for use in a core network device, the apparatus comprising:

7. The session creation apparatus of claim 6 wherein the session release module comprises:

8. The session creation apparatus of claim 7, wherein the transmission sub-module is configured to:

9. The session creation apparatus of claim 6 wherein the session release module comprises:

10. The session creation apparatus according to claim 6, wherein the apparatus comprises:

11. An electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, wherein the computer program when executed by the processor implements the steps of the session creation method of any of claims 1 to 5.

12. A computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements the steps of the session creation method according to any of claims 1 to 5.