WO2018223900A1

WO2018223900A1 - Session processing method, apparatus and system

Info

Publication number: WO2018223900A1
Application number: PCT/CN2018/089559
Authority: WO
Inventors: 胡勇; 时书锋
Original assignee: 华为技术有限公司
Priority date: 2017-06-08
Filing date: 2018-06-01
Publication date: 2018-12-13

Abstract

A session processing method, apparatus and system, for processing, after a UE leaves a region covered by an LADN, an LADN session established before the UE left the region covered by the LADN. The method comprises: a session management functional entity determining that a UE has left a region covered by an LADN; the session management functional entity triggering the deactivation of an LADN session, the LADN session being a session for the UE to perform data transmission in the region covered by the LADN; and in a pre-set time length, the session management functional entity determining whether to release the LADN session according to the condition of the UE re-entering the region covered by the LADN.

Description

Session processing method, device and system

This application claims the priority of a Chinese application filed on June 8, 2017 with application number 201710428385.5, the invention name is "a session processing method, device and system", and the application submitted on June 16, 2017. No. 201710459734.X, the entire disclosure of which is hereby incorporated by reference in its entirety in its entirety in its entirety in the the the the the the the the the

Technical field

The present application relates to the field of wireless communication technologies, and in particular, to a session processing method, apparatus, and system.

Background technique

Local Area Data Network (LADN), LADN refers to a network covering a specific local area. For example, LADN can be a network covering an enterprise campus, campus, airport, railway station, shopping mall, stadium, and the like. The user equipment (UE) accesses the local gateway through the wireless access, thereby directly accessing the LADN corresponding to the local gateway, and the UE can obtain the data commonly used by the LADN from the LADN without going through the network other than the LADN, thereby reducing the acquisition data. The delay reduces the bandwidth occupied by the UE to frequently request data acquisition from a network other than the LADN.

In the technical solution of the existing UE accessing the LADN, the session management function entity delivers the configuration information of the LADN and the information of the area covered by the LADN to the UE based on the location of the UE, when the UE is covered according to the received LADN. When the information of the area determines to enter the area covered by the LADN, the UE will access the LADN according to the configuration information of the received LADN, and establish a LADN session for data transmission. When the UE leaves the area covered by the LADN, there is no method for processing these LADN sessions in the prior art for the LADN session that the UE has established.

In summary, for a LADN session established after the UE enters the area covered by the LADN, it is urgent to design a technical solution for processing the LADN session after the UE leaves the area covered by the LADN.

Summary of the invention

The embodiment of the present invention provides a session processing method, apparatus, and system, which are used to process a LADN session established before the UE leaves the LADN-covered area after the UE leaves the area covered by the LADN.

In a first aspect, an embodiment of the present application provides a session processing method, where the method includes:

The session management function entity first determines whether the UE leaves the area covered by the LADN, and then triggers the deactivation of the LADN session, and determines whether to release the LADN session according to the case that the UE re-enters the area covered by the LADN within the preset duration. The LADN session refers to a session for the UE to perform data transmission in the area covered by the LADN.

Through the foregoing method, for the LADN session established by the session management function entity for the UE entering the area covered by the LADN, the session management function entity triggers the deactivation of the LADN session after determining that the UE leaves the area covered by the LADN to release the network resource occupied by the LADN session. And determining whether to release the LADN session according to the case that the UE re-enters the area covered by the LADN within the preset duration, and implementing the LADN session established before the UE leaves the area covered by the LADN after the UE leaves the LADN-covered area. The processing helps to realize the reasonable utilization of the network resources occupied by the LADN session and improve the utilization of network resources.

In a possible implementation manner, when the session management function entity determines whether to release the LADN session according to the situation that the UE re-enters the area covered by the LADN, the following two situations may be classified:

The first case is: if the UE does not enter the area covered by the LADN again within the preset duration, the session management function entity releases the LADN session.

Through the foregoing method, the session management function entity may release the LADN session established by the UE that does not enter the LADN coverage area within the preset duration to avoid releasing the LADN session of the UE after the UE leaves the LADN-covered area. The problem that the LADN session consumes resources due to long-term occupation of network resources.

The second case is: if the UE enters the area covered by the LADN again within the preset duration, the session management function entity determines not to release the LADN session.

Through the above method, the session management function entity may determine not to release the LADN session established by the UE that re-enters the LADN-covered area within the preset time period, so as to avoid releasing the LADN session of the UE immediately after the UE leaves the LADN-covered area. And the UE needs to repeatedly establish a LADN session for the UE in the area covered by the LADN again. Repeating the establishment of the LADN session increases the signaling overhead.

In a possible implementation, after the session management function entity determines not to release the LADN session, the LADN session is still in a deactivated state, in which case the session management function entity receives a request from the UE for requesting to pass the LADN session. The service request SR message for data transmission triggers the activation of the LADN session.

Through the above method, the UE that enters the area covered by the LADN again within the preset time period can perform data transmission through the activated LADN session, and does not need to repeatedly establish a LADN session for the UE that re-enters the area covered by the LADN, so as to avoid waste of signaling overhead.

In a possible implementation, after the session management function entity triggers the deactivation of the LADN session and determines whether to release the LADN session, the session management function entity cannot temporarily determine whether to release the LADN session, in this case, the session management function. If the entity receives an SR message from the UE for requesting data transmission through the LADN session, the entity sends a response message indicating that the SR message request fails.

Through the foregoing method, it is possible to process the SR message from the UE if the session management function entity does not temporarily detect that the UE re-enters the area covered by the LADN within the preset duration.

In a possible implementation manner, the method for the session management function entity to determine that the UE leaves the area covered by the LADN is as follows: the session management function entity receives indication information from the mobility management function entity, where the indication information is used to indicate the location of the UE; the session management function The entity determines, based on the indication information, that the UE leaves the area covered by the LADN.

Through the above method, the session management function entity can determine that the UE leaves the area covered by the LADN so that the LADN session established by the UE before leaving the area covered by the LADN can be triggered to be deactivated.

Correspondingly, in a possible implementation, before the session management function entity receives the indication information from the mobility management function entity, the session management function entity may request the mobility management function entity to report the location information of the UE to the session management function entity, or the session The management function entity may request the mobility management function entity to notify the session management function entity when determining that the UE leaves the area covered by the LADN.

In a possible implementation manner, the method for determining that the UE leaves the area covered by the LADN for the session management function entity to receive the information included in the indication information from the mobility management function entity may be classified into the following two types:

The first type: the indication information includes the location information of the UE; in this case, if the location indicated by the location information of the UE is not located in the area indicated by the information of the area covered by the LADN pre-stored by the session management function entity, the session The management function entity determines the area in which the UE leaves the LADN coverage.

Through the above method, the session management function entity may determine that the UE leaves the area covered by the LADN if the indication information includes the location information of the UE.

The second type: the indication information includes information for indicating that the UE leaves the area covered by the LADN; in this case, the session management function entity determines that the UE leaves according to the information included in the indication information for indicating that the UE leaves the area covered by the LADN. The area covered by LADN.

Before the session management function entity receives the indication information from the mobility management function entity, the mobility management function entity acquires the location information of the UE, and determines that the UE leaves the LADN coverage according to the location information of the UE and the information of the area covered by the LADN pre-stored by the UE. The area then sends information to the session management function entity to indicate that the UE leaves the area covered by the LADN.

Through the above method, the session management function entity may directly determine the area where the UE leaves the LADN coverage if the indication information includes information indicating the area where the UE leaves the LADN coverage.

In a possible implementation manner, in the method that the foregoing two types of session management function entities determine that the UE leaves the area covered by the LADN, the location information of the UE includes the cell identifier of the cell where the UE is located, and the information of the area covered by the LADN includes the area covered by the LADN. The cell identifier of all cells; or the location information of the UE includes the tracking area identifier TAI of the UE, and the information of the area covered by the LADN includes all TAIs in the area covered by the LADN.

In a possible implementation manner, the method for the session management function entity to trigger the deactivation of the LADN session includes the following operations:

The session management function entity sends a message to the user plane function entity indicating the release of the downlink tunnel resource of the LADN session; or the session management function entity sends a message to the mobility management function entity indicating the release of the air interface resource of the LADN session.

In this way, the downlink tunnel resource and the air interface resource occupied by the LADN session can be released, and the utilization of these resources is improved.

In a second aspect, the embodiment of the present application further provides a session management function entity, where the session management function entity has a function of implementing the behavior of the session management function entity in the foregoing method example. The functions may be implemented by hardware or by corresponding software implemented by hardware. The hardware or the software includes one or more modules corresponding to the functions described above.

In a possible implementation manner, the structure of the session management function entity includes a processing unit and a transceiver unit, and the unit may perform the corresponding function in the method example provided by any one of the implementation manners of the foregoing first aspect. The detailed description is not repeated here.

In a third aspect, the embodiment of the present application further provides a session management function entity, where the session management function entity has a function of implementing the behavior of the session management function entity in the foregoing method example. The functions can be implemented in hardware. The structure of the session management function entity includes a memory, a processor, and a transceiver, wherein the processor, the memory, and the transceiver are connected by a bus; the memory is configured to store a computer readable program; and the processor is called to be stored in the memory. An instruction, which is provided to perform the method provided by any one of the foregoing first aspects, to implement the function of the processing unit included in the structure of the session management function entity in the second aspect; the transceiver is configured to receive data under the control of the processor And/or transmitting data to implement the functions of the transceiver unit included in the structure of the session management function entity in the second aspect.

In a fourth aspect, the embodiment of the present application further provides a session processing system, where the system includes a mobility management function entity and a session management function entity, where the mobility management function entity is configured to send indication information to the session management function entity, and use the indication information. And indicating a location of the user equipment UE; the session management function entity is configured to receive the indication information sent by the mobility management function entity; determine, according to the indication information, the area where the UE leaves the LADN coverage; trigger the deactivation of the LADN session, where the LADN session refers to the UE A session for performing data transmission in an area covered by the LADN; determining whether to release the LADN session according to the case where the UE re-enters the area covered by the LADN within a preset time period.

In a possible implementation, the session management function entity is configured to perform the method provided by any one of the foregoing first aspects.

In a fifth aspect, an embodiment of the present application provides a session processing method, where the method includes:

The session management function entity first sends an event subscription request to the mobility management function entity, the event in the event subscription request includes the area where the UE leaves the LADN coverage, and then receives the first from the mobility management function entity to notify the UE to leave the LADN coverage area. The notification message, the session management function entity may trigger the first session operation according to the first notification message. The first session operation includes releasing a LADN session or deactivating a LADN session, where the LADN session refers to a session for the UE to perform data transmission in an area covered by the LADN.

Through the above method, for the LADN session established by the session management function entity for the UE entering the area covered by the LADN, the session management function entity subscribes to the mobile management function entity for the event of the event that the UE leaves the area covered by the LADN through the event subscription request, and receives the event. After the first notification message sent by the mobility management function entity to notify the UE to leave the area covered by the LADN, triggering the deactivation of the LADN session or releasing the LADN session according to the first notification message, after the UE leaves the area covered by the LADN, The processing of the LADN session established before the UE leaves the area covered by the LADN helps to realize the reasonable utilization of the network resources occupied by the LADN session and improve the utilization of network resources.

In a possible implementation manner, in a case where the first session operation includes releasing the LADN session, the method for the session management function entity to trigger the first session operation according to the first notification message may be classified into the following two types:

The first method is: the session management function entity releases the LADN session according to the first notification message.

By the first method, the problem of resource waste caused by continuing to reserve the LADN session of the UE after the UE leaves the LADN-covered area can be avoided.

The second method is: the session management function entity triggers the deactivation of the LADN session according to the first notification message, and determines whether to release the LADN session according to the case that the UE re-enters the area covered by the LADN within the preset duration.

In a possible implementation, the event in the event subscription request further includes the area where the UE enters the LADN coverage. In case the event in the event subscription request includes the UE entering the area covered by the LADN, after the session management function entity sends the event subscription request to the mobility management function entity, the session management function entity may further receive the notification from the mobility management function entity for notifying the UE. The second notification message entering the area covered by the LADN triggers the second session operation according to the second notification message. The second session operation includes activating a LADN session or triggering establishment of a LADN session between the UE and the LADN.

In a possible implementation manner, when the event in the event subscription request includes the UE entering the area covered by the LADN, when the session management function entity triggers the second session operation according to the second notification message, the following two situations may be

The first case is: when the session management function entity triggers the deactivation of the LADN session according to the first notification message, and the session management function entity determines, according to the second notification message, that the UE enters the area covered by the LADN again, if the session management function entity receives To the SR message from the UE for requesting data transmission through the LADN session, since the LADN session is in the deactivated state at this time, the session management function entity deactivates the session management function entity according to the first notification message according to the second notification message. The LADN session is activated.

In this way, the UE can directly transmit data through the activated LADN session.

The second case is: if the session management function entity releases the LADN session according to the first notification message, and the session management function entity does not cancel the notification that the UE re-enters the area covered by the LADN, if the session management function entity receives the The UE's message for requesting establishment of a LADN session between LADNs triggers establishment of a LADN session between the UE and the LADN according to the second notification message.

In this way, the UE can perform data transmission through the established LADN session.

In a sixth aspect, the embodiment of the present application further provides a session management function entity, where the session management function entity has a function of implementing the behavior of the session management function entity in the method example of the foregoing fifth aspect. The functions may be implemented by hardware or by corresponding software implemented by hardware. The hardware or the software includes one or more modules corresponding to the functions described above.

In a possible implementation manner, the structure of the session management function entity includes a processing unit and a transceiver unit, and the unit may perform the corresponding function in the method example provided by any one of the foregoing fifth aspects. For details, refer to the method example. The detailed description is not repeated here.

In a seventh aspect, the embodiment of the present application further provides a session management function entity, where the session management function entity has a function of implementing the behavior of the session management function entity in the method example of the foregoing fifth aspect, and the function may be implemented by hardware. The structure of the session management function entity includes a memory, a processor, and a transceiver, wherein the processor, the memory, and the transceiver are connected by a bus; the memory is configured to store a computer readable program; and the processor is called to be stored in the memory. An instruction, which is provided to perform the method provided by any one of the foregoing fifth aspects, to implement the functions of the processing unit included in the structure of the session management function entity in the sixth aspect; and the transceiver for receiving data under the control of the processor And/or transmitting data to implement the functions of the transceiving unit included in the structure of the session management function entity in the sixth aspect.

In an eighth aspect, the embodiment of the present application further provides a session processing system, where the system includes a mobility management function entity and a session management function entity, where the session management function entity is configured to send an event subscription request to the mobility management function entity, where the event The mobile management function entity may be configured to: after receiving the event subscription request sent by the session management function entity, if it is determined that the UE leaves the LADN coverage area, send a message to the session management function entity to notify the UE to leave the LADN. a first notification message of the coverage area; the session management function entity, further configured to: after receiving the first notification message, trigger a first session operation according to the first notification message, where the first session operation includes deactivating a LADN session or Release the LADN session.

In a possible implementation, the session management function entity is configured to perform the method provided by any one of the foregoing fifth aspects.

In a ninth aspect, the embodiment of the present application further provides a computer storage medium, where the software program stores a software program, where the software program can implement the first aspect or the first one when being read and executed by one or more processors A method provided by any one of the aspects.

In a tenth aspect, the embodiment of the present application provides a computer program product comprising instructions, which when executed on a computer, enable the computer to perform the session processing method of any of the above first aspects.

In an eleventh aspect, the embodiment of the present application further provides a computer storage medium, where the software program stores a software program, and the software program can implement the fifth aspect or the foregoing when read and executed by one or more processors. A method provided by any of the five implementations.

In a twelfth aspect, the embodiment of the present application provides a computer program product comprising instructions, which when executed on a computer, enable the computer to perform the session processing method of any of the above fifth aspects.

In the technical solution of the session processing provided by the embodiment of the present application, for the LADN session established by the session management function entity for the UE entering the area covered by the LADN, the session management function entity triggers the deactivation of the LADN session after determining that the UE leaves the area covered by the LADN. And determining whether to release the LADN session according to the case that the UE re-enters the area covered by the LADN within the preset duration, and implementing the LADN session established before the UE leaves the area covered by the LADN after the UE leaves the LADN-covered area. deal with. Therefore, the technical solution provided by the embodiment of the present application can reasonably utilize the network resources occupied by the LADN session, and improve the utilization of network resources.

DRAWINGS

FIG. 1 is a schematic structural diagram of a session processing system according to an embodiment of the present application;

2 is a schematic structural diagram of a 5G system according to an embodiment of the present application;

FIG. 3 is a schematic flowchart of a session processing method according to an embodiment of the present disclosure;

4 is a schematic flowchart of a method for processing a LADN session in a first type of 5G system according to an embodiment of the present disclosure;

FIG. 5 is a schematic flowchart of a method for processing a LADN session in a second type of 5G system according to an embodiment of the present disclosure;

6 is a schematic flowchart of a method for processing a LADN session in a third 5G system according to an embodiment of the present application;

FIG. 7 is a schematic flowchart of a method for processing a LADN session in a fourth type of 5G system according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a first session management function entity according to an embodiment of the present application;

FIG. 9 is a schematic structural diagram of a second session management function entity according to an embodiment of the present application;

FIG. 10 is a schematic structural diagram of another session processing system according to an embodiment of the present disclosure;

FIG. 11 is a schematic flowchart diagram of another session processing method according to an embodiment of the present disclosure;

FIG. 12 is a schematic flowchart of a method for processing a LADN session in a fifth type of 5G system according to an embodiment of the present disclosure;

FIG. 13 is a schematic flowchart of a method for processing a LADN session in a sixth type of 5G system according to an embodiment of the present disclosure;

FIG. 14 is a schematic flowchart of a method for processing a LADN session in a seventh type of 5G system according to an embodiment of the present disclosure;

FIG. 15 is a schematic structural diagram of a third session management function entity according to an embodiment of the present application;

FIG. 16 is a schematic structural diagram of a fourth session management function entity according to an embodiment of the present disclosure.

detailed description

The embodiment of the present invention provides a session processing method, apparatus, and system, which are used to process a LADN session established before the UE leaves the LADN-covered area after the UE leaves the area covered by the LADN. The method, the device and the system are based on the same concept. Since the principles of the method, the device and the system for solving the problem are similar, the implementation of the method, the device and the system can be referred to each other, and the repeated description will not be repeated.

The technical solution provided by the embodiment of the present application is applicable to a session processing scenario for the LADN. LADN refers to a network that covers a specific local area. For example, LADN can be a network covering a campus network, a station, and the like. The UE accesses the user plane node of the LADN through the radio access network, thereby directly accessing the LADN corresponding to the user plane node of the LADN, and the UE can obtain its commonly used data from the LADN without going through a network other than the LADN, thus reducing the acquisition data. The delay reduces the bandwidth occupied by the UE to frequently request data acquisition from a network other than the LADN. The process of the UE accessing the LADN includes: after the UE enters the area covered by the LADN, the session management function entity in the control plane node sends the LADN configuration information and the area information of the LADN coverage area to the UE based on the location of the UE. After determining, by the information of the area covered by the received LADN, the UE enters the area covered by the LADN, and accesses the LADN according to the configuration information of the received LADN. After the UE accesses the LADN, the network establishes a LADN session for the UE, and the LADN session refers to a session for the UE to perform data transmission in the area covered by the LADN. The LADN session is divided into the LADN session in the active state and the LADN session in the deactivated state. The LADN session in the active state occupies the downlink tunnel resource and the air interface resource, and the LADN session in the activated state can be in the LADN coverage area. The data transmission is performed internally; the LADN session in the deactivated state does not occupy the downlink tunnel resource and the air interface resource, and the LADN session in the deactivated state cannot be used for the UE to perform data transmission in the area covered by the LADN.

The embodiment of the present application provides a session processing system. The architecture of the system may be as shown in FIG. 1, including a mobility management function entity 101 and a session management function entity 102. The system works as follows:

The mobility management function entity 101 sends the indication information to the session management function entity 102. After receiving the indication information sent by the mobility management function entity 101, the session management function entity 102 determines the area where the UE leaves the LADN according to the location of the UE indicated by the indication information. The session management function entity 102 triggers the deactivation of the LADN session in the case of determining that the UE leaves the area covered by the LADN, and determines whether to release the LADN session according to the case where the UE re-enters the area covered by the LADN within the preset duration. If the UE does not enter the area covered by the LADN again within the preset duration, the session management function entity 102 releases the LADN session, so that the LADN session can be avoided if the LADN session of the UE is not released after the UE leaves the LADN-covered area for a long time. The problem of wasted resources caused by long-term occupation of network resources. If the UE enters the area covered by the LADN again within the preset duration, the session management function entity 102 determines not to release the LADN session, so that if the UE leaves the LADN-covered area, the LADN session of the UE is immediately released, and the UE enters again. The problem of establishing a LADN session for the UE needs to be repeated in the area covered by the LADN. Repeating the establishment of the LADN session increases the signaling overhead.

The indication information is used to indicate a location of the UE, and the indication information may include location information of the UE or information used to indicate that the UE leaves the area covered by the LADN. In the case where the indication information includes the location information of the UE, the session management function entity 102 determines the area where the UE leaves the LADN coverage according to the location information of the UE included in the indication information and the information of the area covered by the LADN stored in advance. In a case where the indication information includes information indicating an area where the UE leaves the LADN coverage, the mobility management function entity 101 determines, according to the location information of the UE and the information of the area covered by the LADN stored in advance, the area where the UE leaves the LADN coverage, and The session management function entity 102 transmits indication information including information for indicating that the UE leaves the area covered by the LADN.

The above-mentioned session processing system can implement the processing of the LADN session established before the UE leaves the area covered by the LADN after the UE leaves the area covered by the LADN, which helps to realize the network resources occupied by the LADN session and improve the network resources. Utilization.

The technical solutions provided by the embodiments of the present application can be applied to various systems, including a 5G system. For example, the applicable system may be a Global System of Mobile Communication (GSM) system, a Code Division Multiple Access (CDMA) system, or a Wideband Code Division Multiple Access (WCDMA) general packet. General Packet Radio Service (GPRS) system, Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), general purpose Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) system, and 5G system. The session management function entity and the mobility management function entity are included in the multiple systems. In different systems, the session management function entity and the mobility management function entity may have different names. For example, in the 5G system, the name of the session management function entity is SMF (Session Management Function), the name of the mobility management function entity is AMF (Access and Mobility Management Function).

For example, the 5G system shown in FIG. 2 includes an SMF, an AMF, a Radio Access Network (RAN), and a User Plane Function (UPF), and may also include a policy control function. Policy Control Function (PCF), Application Function (AF), Data Network (DN), United Data Management (UDM), etc. The SMF is mainly used for the establishment, release, and update of the triggering and control sessions in the 5G system. The AMF can access the signaling of the UE through the N1 interface and the signaling of the RAN through the N2 interface to complete the registration and signaling of the UE. Forwarding and UE mobility management, SMF and AMF are control plane nodes; N1 interface is the signaling interface between the UE and the mobility management functional entity, and the N2 interface is the signaling interface between the RAN and the mobility management functional entity; UPF is The user plane node can implement the user plane gateway function, and is mainly used to control the execution of specific functions such as data forwarding, monitoring, and charging on the user plane; the RAN can refer to all or part of the fixed user accessing the switch in a wireless manner, It is the ground infrastructure that provides management tasks for a range of users, including access, roaming, connecting to a public switched telephone network, and connecting to the network. In the 5G system shown in FIG. 2, the UE can access the DN connected to the UPF through the UPF. In the case that the UPF is a user plane node of the network other than the LADN, the DN connected to the UPF is the LADN except LADN. In other networks, in the case where the UPF is a user plane node of the LADN, the DN connected to the UPF is LADN.

The UE involved in the embodiment of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem. The wireless terminal device can communicate with one or more core networks via the RAN, which can be a mobile terminal device, such as a mobile telephone (or "cellular" telephone) and a computer with a mobile terminal device, for example, can be portable , pocket, handheld, computer built-in or in-vehicle mobile devices that exchange language and/or data with the wireless access network. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (Personal Digital Assistant, PDA) and other equipment. The wireless terminal device may also be referred to as a system, a Subscriber Unit, a Subscriber Station, a Mobile Station, a Mobile, a Remote Station, and an Access Point. , Remote Terminal, Access Terminal, User Terminal, User Agent, User Device, or User Equipment.

In the technical solution provided by the embodiment of the present application, the session management function entity triggers the deactivation of the LADN session after determining that the UE leaves the area covered by the LADN, and determines, after deactivating the LADN session, based on the case that the UE re-enters the area covered by the LADN. Whether to release the LADN session, the LADN session established before the UE leaves the LADN-covered area is processed after the UE leaves the area covered by the LADN. The technical solutions provided by the embodiments of the present application are described in detail below.

The embodiment of the present application provides a session processing method, as shown in FIG. 3, the method includes:

S301. The session management function entity determines an area where the UE leaves the LADN coverage.

The session management function entity in S301 may determine, based on the indication information indicating the location of the UE, that the UE leaves the area covered by the LADN. The session management function entity may receive indication information from the mobility management function entity indicating the location of the UE before S301.

The session management function entity in S301 can determine the area where the UE leaves the LADN coverage by the following two methods:

Method 1: In the case that the indication information includes the location information of the UE, the session management function entity determines whether the location indicated by the location information of the UE is located according to the location information of the UE and the information of the area covered by the LADN stored in the UE. The pre-stored LADN covers the area indicated by the information within the area. If the location indicated by the location information of the UE is not located in the area indicated by the information of the area covered by the LADN pre-stored by the session management function entity, it indicates that the UE is not in the area covered by the LADN, so that the session management function entity may determine that the UE leaves the LADN. Covered area.

Method 2: In the case that the foregoing indication information includes information for indicating that the UE leaves the area covered by the LADN, the session management function entity directly determines, according to the indication information, the area that the UE leaves the LADN coverage. Before the mobility management function entity sends the information indicating the area where the UE leaves the LADN coverage to the session management function entity, the mobility management function entity acquires the location information of the UE, and according to the location information of the UE and the area covered by the LADN pre-stored by itself. The information is used to determine whether the location indicated by the location information of the UE is located in an area indicated by the information of the area covered by the LADN stored in advance. If the location indicated by the location information of the UE is not located in the area indicated by the information of the area covered by the LADN pre-stored by the mobility management function entity, it indicates that the UE is not in the area covered by the LADN, so that the mobility management function entity may determine that the UE leaves the LADN. Covered area.

In the foregoing method 1 and method 2, the mobility management function entity may obtain location information of the UE from the radio access network.

In the foregoing method 1 and method 2, in order to facilitate determining whether the location indicated by the location information of the UE is located in the area indicated by the information of the pre-stored LADN coverage area, the information of the area covered by the LADN includes the cells of all the cells in the area covered by the LADN. The location information of the UE includes the cell identifier of the cell where the UE is located, and/or the information of the area covered by the LADN includes all Tracking Area Identity (TAI) in the area covered by the LADN, and the location information of the UE includes the UE. TAI. Wherein, when the information of the area covered by the LADN and the location information of the UE both include the TAI, the granularity is more in line with the requirements of the actual application.

The information of the area covered by the LADN includes the cell identifier of all the cells in the area covered by the LADN, and the location information of the UE includes the cell identity of the cell where the UE is located, and the session management function entity receives the cell of the UE from the mobility management function entity. After the cell identifier, if the cell identifier of the cell where the UE is located does not exist in the cell identifier of all the cells in the area covered by the LADN, the cell where the UE is located is not the cell in the area covered by the LADN, and the session management function entity may determine that the UE leaves the LADN coverage. Area.

S302. The session management function entity triggers deactivation of the LADN session.

A LADN session refers to a session for a UE to perform data transmission within an area covered by LADN. Since the LADN session is still active after the UE leaves the area covered by the LADN, and the LADN session can only be used for data transmission by the UE in the area covered by the LADN, it is necessary to prohibit the UE from continuing to pass the activated state after leaving the area covered by the LADN. The LADN session performs data transfer. In addition, since the LADN session in the active state occupies the downlink tunnel resource and the air interface resource, the LADN session that is in the active state after the UE leaves the LADN-covered region will continue to occupy these resources, thereby causing waste of resources.

For the foregoing reasons, in the embodiment, the session management function entity triggers the deactivation of the LADN session in the case that the UE leaves the area covered by the LADN, so as to prevent the UE from continuing to perform data through the LADN session in the activated state after leaving the area covered by the LADN. The downlink tunnel resource and air interface resource occupied by the LADN session are released.

The method for the session management function entity to trigger the deactivation of the LADN session includes:

The session management function entity sends a message to the user plane function entity to indicate that the downlink tunnel resource occupied by the LADN session is released, and the user plane function entity releases the downlink tunnel resource occupied by the LADN session after receiving the message; or, the session management function entity The mobile management function entity sends a message for instructing to release the air interface resource occupied by the LADN session, and the mobility management function entity forwards the message to the radio access network, and the radio access network interacts with the UE to release the air interface resource occupied by the LADN session.

It should be noted that, in the method that the foregoing session management function entity triggers the deactivation of the LADN session, the process of releasing the downlink tunnel resource and the air interface resource occupied by the LADN session may be referred to the prior art, and details are not described herein again. The embodiment does not limit that the execution session management function entity sends a message to the user plane function entity for indicating the release of the downlink tunnel resource occupied by the LADN session, and the session management function entity sends the mobility management function entity to indicate that the LADN session occupation is released. The order of the messages of the air interface resources.

S303. The session management function entity determines whether to release the LADN session according to the case that the UE re-enters the area covered by the LADN.

In a specific implementation, in S303, if the UE does not enter the area covered by the LADN again within the preset duration, the session management function entity releases the LADN session, so that the LADN of the UE may not be released after the UE leaves the LADN-covered area for a long time. Session, the problem of wasted resources caused by long-term occupation of network resources by the LADN session. Alternatively, if the UE enters the area covered by the LADN again within the preset time period, the session management function entity determines not to release the LADN session, so that if the LADN session of the UE is released immediately after the UE leaves the area covered by the LADN, and the UE again The problem of establishing a LADN session for the UE needs to be repeated in the area covered by the LADN. Repeating the establishment of the LADN session increases the signaling overhead.

In a specific implementation, in S303, a timer may be used to preset a preset duration, and then S303 is implemented, where the method includes:

When the session management function entity determines that the UE leaves the area covered by the LADN, the session management function entity starts a timer whose preset duration is a preset duration, and starts detecting whether the UE enters the area covered by the LADN again. If it is detected that the UE enters the area covered by the LADN again when the timer does not time out, the session management function entity determines not to release the LADN session and turns off the timer; if the timer expires and still does not detect that the UE enters the area covered by the LADN again, then The session management function entity releases the LADN session.

For the method for the session management function entity to detect whether the UE re-enters the area covered by the LADN, the method for determining whether the UE leaves the area covered by the LADN is not described herein.

Optionally, after the session management function entity determines that the UE leaves the LADN coverage area and triggers the deactivation of the LADN session, if the session management function entity temporarily does not detect that the UE re-enters the LADN coverage area within the preset duration, and the preset duration is If there is no end, then the session management function entity cannot temporarily determine whether to release the LADN session. If the session management function entity receives a Service Request (SR) message from the UE, the SR message is used for the UE to request to pass. The LADN session performs data transmission. At this time, the LADN session is in the deactivated state, and the session management function entity does not detect that the UE re-enters the area covered by the LADN. The session management function entity sends a response message for indicating that the SR message request fails. Optionally, the SR message may be further used to indicate a location of the UE, so that the session management function entity may determine, according to the location of the UE indicated by the SR message, that the UE does not enter the area covered by the LADN again. For example, the preset duration is 5 minutes. At the 2nd minute, the session management function entity receives the SR message from the UE. At this time, the session management function entity does not detect that the UE re-enters the area covered by the LADN, and the session management function entity sends the message to the UE. A response message indicating that the SR message request failed.

Optionally, after the session management function entity determines not to release the LADN session, if the session management function entity receives an SR message from the UE for requesting data transmission through the LADN session, the session is deactivated because the LADN session is in a session. The management function entity triggers the activation of the LADN session so that the UE can directly transmit data through the activated LADN session.

A session processing method provided by an embodiment of the present application is exemplified by the 5G system shown in FIG. 2 .

An example of one

For example, in the 5G system shown in FIG. 2, the process of performing RAN handover by the UE based on the Xn interface is combined with the process of processing the LADN session, where the Xn interface is an interface between the source RAN and the target RAN, which is provided by the embodiment of the present application. The network element in the 5G system involved in a session processing method includes a source RAN, a target RAN, an AMF, an SMF, and a UPF. As shown in FIG. 4, the interaction process of each network element is as follows:

S401. The target RAN sends an N2 message to the AMF.

After the UE is switched from the source RAN to the target RAN, the target RAN sends an N2 message to the AMF, where the N2 message includes the location information of the UE and the N2 interface-based session management (SM) N2 information, where the SM N2 information includes the UE. N3 tunnel information for all active LADN sessions.

S402. The AMF determines an area where the UE leaves the LADN coverage.

After receiving the N2 message sent by the target RAN, the AMF determines the area where the UE leaves the LADN according to the location information of the UE included in the N2 message and the information of the area covered by the LADN pre-stored by the AMF.

S403. The AMF sends an update session request message to the SMF.

The update session request message sent by the AMF to the SMF includes information indicating that the UE leaves the area covered by the LADN.

S404. The SMF determines that the UE leaves the area covered by the LADN, triggers deactivation of the LADN session, and starts a timer.

After receiving the update session request message sent by the AMF, the SMF directly determines the area where the UE leaves the LADN coverage according to the information included in the received update session request message for indicating that the UE leaves the area covered by the LADN. After the SMF determines that the UE leaves the area covered by the LADN, the SMF triggers the deactivation of the LADN session, and starts a timer whose preset duration is a preset duration, where the start time of the timer may be the time when the SMF determines that the UE leaves the area covered by the LADN.

The SMF triggers the deactivation of the LADN session, including releasing the air interface resource and the N3 tunnel resource of the LADN session. After performing S404, the air interface resources for releasing the LADN session are implemented by performing the following four steps S405 to S408, by performing the following S409 to S410. Steps to implement the release of the N3 tunnel resource for the LADN session.

S405. The SMF sends an update session response message to the AMF.

The update session response message sent by the SMF to the AMF includes an identifier for indicating a LADN session to deactivate the UE.

S406. The AMF determines to release the air interface resource of the LADN session.

After receiving the update session response message sent by the SMF, the AMF determines the air interface resource occupied by the LADN session of the UE according to the identifier of the LADN session used to indicate the UE to be activated.

S407. The AMF sends an N2 response message to the target RAN.

After the AMF determines to release the air interface resource occupied by the LADN session of the UE, it sends an N2 response message to the target RAN, where the N2 response message includes an identifier for indicating the LADN session for deactivating the UE.

S408. Release an air interface resource of the LADN session.

After the target RAN receives the N2 response message sent by the AMF, the target RAN releases the air interface resource occupied by the LADN session of the UE according to the identifier of the LADN session that is used to indicate that the UE is deactivated according to the N2 response message, and the target RAN passes the The UE performs an interaction to release the air interface resource occupied by the LADN session of the UE.

S409. The SMF sends a message to the UPF to indicate that the N3 tunnel information of the LADN session is released.

S410. The UPF releases the N3 tunnel information of the LADN session.

After receiving the message sent by the SMF to indicate the release of the N3 tunnel information of the LADN session, the UPF releases the N3 tunnel information of the LADN session, where the N3 interface is a user plane interface between the RAN and the UPF, and the N3 interface can be used for the RAN and the RAN. Signaling transmission between UPFs.

It should be noted that, in this embodiment, the sequence between the four steps S405 to S408 and the steps S409 to S410 are not limited, that is, the air interface resource for releasing the LADN session and the release LADN are not limited. The order of the tunnel resources between sessions.

S411. The SMF determines whether to release the LADN session according to the detected situation that the UE re-enters the area covered by the LADN within the timing duration of the timer.

If the SMF detects that the UE enters the area covered by the LADN again within the timing of the timer, then S412 is performed. If the SMF does not detect that the UE enters the area covered by the LADN again within the timing of the timer, S413 is performed.

S412. The SMF determines not to release the LADN session.

In the case that the timer has not timed out, that is, within the timer duration of the timer, if the SMF detects that the UE enters the area covered by the LADN again, the SMF determines not to release the LADN session and turns off the timer.

S413. The SMF releases the LADN session.

In the case that the timer expires, if the SMF still does not detect that the UE enters the area covered by the LADN again, the SMF releases the LADN session.

S414. The SMF sends a message to the AMF to indicate that the LADN session is released.

S415. Release the LADN session.

After the AMF receives the message sent by the SMF to indicate the release of the LADN session, the AMF releases the LADN session according to the indication of the message.

The process of releasing the LADN session by the SMF in the above S413 and the process of releasing the LADN session by the AMF in S415 can be referred to the prior art, and details are not described herein again.

For the specific implementation of the steps in the process of the interaction between the network elements shown in FIG. 4, refer to the related descriptions in S301 to S303 above, and details are not described herein again.

Example two

For example, in the 5G system shown in FIG. 2, the process of performing RAN handover by the UE based on the Xn interface is combined with the process of processing the LADN session. The session processing method provided by the embodiment of the present application is related to the network in the 5G system. The element includes a source RAN, a target RAN, an AMF, an SMF, and a UPF, and the interaction process of each network element is as shown in FIG. 5. The interaction process shown in Figure 5 is similar to the interaction process shown in Figure 4. The similarities between the two are not repeated here. The main difference between the two is the following steps:

S502. The AMF sends an update session request message including location information of the UE to the SMF.

After receiving the N2 message sent by the target RAN, the AMF obtains the location information of the UE included in the N2 message, and sends an update session request message to the SMF, where the update session request message includes the location information of the UE.

S503. The SMF determines that the UE leaves the area covered by the LADN, triggers deactivation of the LADN session, and starts a timer.

After receiving the update session request message sent by the AMF, the SMF determines the area where the UE leaves the LADN coverage according to the location information of the UE included in the received update session request message and the information of the area covered by the LADN stored in advance. After the SMF determines that the UE leaves the area covered by the LADN, the SMF triggers the deactivation of the LADN session, and starts a timer whose preset duration is a preset duration, where the start time of the timer may be the time when the SMF determines that the UE leaves the area covered by the LADN.

For the specific implementation of the steps S501, S503 to S514, and the like in the process of the interaction between the network elements shown in FIG. 5, refer to steps S401, S404 to S415, etc. in the interaction process between the network elements shown in FIG. The related descriptions are not repeated here.

An example of three

The process of processing the LADN session by using the independent information exchange process in the 5G system shown in FIG. 2 is taken as an example. The specific interaction process of each network element in the 5G system is shown in FIG. 6 . The network element in the 5G system involved in the session processing method provided by the embodiment of the present application includes a source RAN, a target RAN, an AMF, an SMF, and an UPF. As shown in FIG. 6, the interaction process of each network element is as follows:

S601. The AMF sends the location information of the UE to the SMF.

After the network establishes a LADN session for the UE, the AMF sends the location information of the UE to the SMF.

Optionally, the SMF may request the AMF to report the location information of the UE to the SMF before the S601. The SMF may also request the AMF to report the frequency, the number of times, and the like of the location information of the UE to the SMF. For example, the SMF may request the AMF to report the location of the UE only to the SMF. For example, the SMF may request the AMF to report the location information of the UE to the SMF every 1 second.

S602. The SMF determines that the UE leaves the area covered by the LADN, triggers deactivation of the LADN session, and starts a timer.

After receiving the location information of the UE sent by the AMF, the SMF determines, according to the received location information of the UE and the information of the area covered by the LADN stored in advance, the area where the UE leaves the LADN.

After the SMF determines that the UE leaves the area covered by the LADN, the SMF triggers the deactivation of the LADN session and starts a timer whose preset duration is a preset duration. In the process of the SMF triggering the deactivation of the LADN session, the SMF sends a message to the AMF indicating to deactivate the LADN session of the UE, or the SMF sends a message to the UPF indicating the release of the N3 tunnel information of the LADN session.

The SMF triggers the deactivation of the LADN session, including releasing the air interface resource and the downlink tunnel resource of the LADN session. After performing 602, the air interface resource and the downlink tunnel resource for releasing the LADN session are implemented by performing the following step S603.

S603. Deactivate the LADN session.

The process of releasing the air interface resources of the LADN session by the AMF and the target RAN in S603 is similar to the four steps S405 to S408 in the interaction process shown in FIG. 4 above, and the process of releasing the downlink tunnel resource of the LADN session by the UPF is as shown in FIG. 4 above. The two steps S409 to S410 are similar in the illustrated interaction process, and are not described here.

The five steps S410 to S608 in the interaction between the network elements shown in FIG. 6 are similar to the five steps S411 to S415 in the interaction between the network elements shown in FIG. 4 above. Let me repeat.

An example of four

The process of processing the LADN session by using the independent information exchange process in the 5G system shown in FIG. 2 is an example. The network element in the 5G system involved in the session processing method provided by the embodiment of the present application includes the source RAN and the target. RAN, AMF, SMF, UPF, etc., the interaction process of each network element is shown in Figure 7. The interaction process shown in Figure 7 is similar to the interaction process shown in Figure 6. The similarities between the two are not repeated here. The main difference between the two is the following two steps:

S701. The AMF determines an area where the UE leaves the LADN coverage.

The AMF determines the area where the UE leaves the LADN coverage according to the location information of the UE and the information of the area covered by the LADN stored in advance.

S702. The AMF sends, to the SMF, information used to indicate that the UE leaves the area covered by the LADN.

S703. The SMF determines an area where the UE leaves the LADN coverage.

After receiving the information sent by the AMF to indicate that the UE leaves the LADN coverage area, the SMF directly determines, according to the information, the area where the UE leaves the LADN coverage.

For the specific implementation of the steps S704 to S709 in the interaction process between the network elements shown in FIG. 7, refer to the related descriptions in the steps S603 to S608 in the interaction process between the network elements shown in FIG. , will not repeat them here.

In the session processing method provided by the embodiment of the present application, for the LADN session established by the session management function entity for the UE entering the area covered by the LADN, the session management function entity triggers the deactivation of the LADN session after determining that the UE leaves the area covered by the LADN, and Determining whether to release the LADN session according to the case that the UE re-enters the area covered by the LADN within the preset duration, realizes processing the LADN session established before the UE leaves the LADN-covered area after the UE leaves the area covered by the LADN. Therefore, the technical solution provided by the embodiment of the present application can reasonably utilize the network resources occupied by the LADN session, and improve the utilization of network resources.

Based on the same application concept, the embodiment of the present application further provides a session management function entity, and the session management function entity can implement the method provided by the embodiment corresponding to FIG. Referring to FIG. 8, the session management function entity includes: a processing unit 801 and a transceiver unit 802, where

The processing unit 801 is configured to determine an area where the user equipment UE leaves the local area data network LADN;

The transceiver unit 802 is configured to trigger a deactivation of the LADN session, where the LADN session refers to a session for the UE to perform data transmission in an area covered by the LADN;

The processing unit 801 is further configured to determine whether to release the LADN session according to the case that the UE re-enters the area covered by the LADN within the preset duration.

Optionally, the processing unit 801 determines whether to release the LADN session according to the case that the UE re-enters the area covered by the LADN within the preset duration, and is specifically used to: if the UE does not enter the area covered by the LADN again within the preset duration, The LADN session is released.

Optionally, the processing unit 801 determines, according to the case that the UE re-enters the area covered by the LADN, whether the LADN session is released, and is used to: if the UE enters the LADN coverage area again within the preset duration, Make sure not to release the LADN session.

Optionally, the processing unit 801 is further configured to: after receiving the LADN session, if the service request SR message from the UE for requesting data transmission through the LADN session is received by the transceiver unit 802, triggering by the transceiver unit 802 Activate the LADN session.

Optionally, the transceiver unit 802 is further configured to: after receiving the deactivated LADN session, and before the processing unit 801 determines whether to release the LADN session, if receiving a service request SR from the UE for requesting data transmission through the LADN session The message is sent to the UE to indicate a response message that the SR message request failed.

Optionally, when the determining that the user equipment UE leaves the area covered by the local area data network LADN, the processing unit 801 is specifically configured to:

The indication information from the mobility management function entity is received by the transceiver unit 802, the indication information is used to indicate the location of the UE; and the area where the UE leaves the LADN coverage is determined based on the indication information.

Optionally, the indication information may include the location information of the UE. When the indication information includes the location information of the UE, the processing unit 801 determines, according to the indication information, that the UE leaves the area covered by the LADN, specifically:

If the location indicated by the location information of the UE is not within the area indicated by the information of the area covered by the LADN pre-stored by the session management function entity, it is determined that the UE leaves the area covered by the LADN.

Optionally, the indication information may include information indicating an area where the UE leaves the LADN coverage; where the indication information includes information indicating an area where the UE leaves the LADN coverage, the processing unit 801 determines, according to the indication information, that the UE leaves the LADN coverage. When the area is specifically used for:

The area where the UE leaves the LADN coverage is determined according to the information included in the indication information for indicating that the UE leaves the area covered by the LADN.

Optionally, the location information of the UE includes the cell identifier of the cell where the UE is located, and the information of the area covered by the LADN includes the cell identifier of all the cells in the area covered by the LADN; or the location information of the UE includes the tracking area identifier TAI of the UE, and the LADN is covered. The information for the area includes all TAIs within the area covered by the LADN.

Optionally, when the transceiver unit 802 triggers the deactivation of the LADN session, the method is specifically configured to: send a message to the user plane function entity to indicate that the LADN session is released, or send a message to the mobility management function entity to indicate that the LADN session is released. The message of the air interface resource.

It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logical function division. In actual implementation, there may be another division manner. The functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application, in essence or the contribution to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

Based on the same application concept, the embodiment of the present application further provides a session management function entity, which uses the method provided by the embodiment corresponding to FIG. 3, and may be the same device as the session management function entity shown in FIG. . Referring to FIG. 9, the session management function entity includes a processor 901, a transceiver 902, a bus 903, and a memory 904, where:

The processor 901 is configured to read a program in the memory 903 and perform the following process:

Determining the area where the UE leaves the LADN coverage; triggering the deactivation of the LADN session by the transceiver 902, the LADN session refers to the session for the UE to perform data transmission in the area covered by the LADN; and enters the LADN coverage again according to the UE within the preset duration The situation in the area to determine whether to release the LADN session;

The transceiver 902 is configured to receive and transmit data under the control of the processor 901.

Optionally, when the processor 901 determines whether to release the LADN session, the processor 901 is specifically configured to: if the UE does not enter the area covered by the LADN again within the preset duration, release the LADN session.

Optionally, when the processor 901 determines whether to release the LADN session, the method is specifically configured to: if the UE enters the LADN coverage area again within the preset duration, determine that the LADN session is not released.

Correspondingly, the processor 901 is further configured to: after receiving the SR message for requesting data transmission through the LADN session by the transceiver 902 after determining to not release the LADN session, triggering the activation of the LADN session.

Optionally, the processor 901 is further configured to: after receiving the LADN session by the transceiver 902, and before determining whether to release the LADN session, if the transceiver 902 receives the data transmission from the UE for requesting the LADN session. The SR message is sent to the UE through the transceiver 902 to send a response message indicating that the SR message request failed.

Optionally, when the processor 901 determines that the user equipment UE leaves the area covered by the local area data network LADN, the processor 901 is specifically configured to:

The indication information from the mobility management function entity is received by the transceiver 902, the indication information is used to indicate the location of the UE; and the area where the UE leaves the LADN coverage is determined based on the indication information.

Optionally, the indication information may include the location information of the UE. If the indication information includes the location information of the UE, the processor 901 determines, according to the indication information, that the UE leaves the area covered by the LADN, specifically:

Optionally, the indication information may include information for indicating that the UE leaves the area covered by the LADN; in case the indication information includes information for indicating that the UE leaves the area covered by the LADN, the processor 901 determines that the UE leaves the LADN coverage based on the indication information. When the area is specifically used for:

Optionally, the location information of the UE includes the cell identifier of the cell where the UE is located, and the information of the area covered by the LADN includes the cell identifier of all the cells in the area covered by the LADN; or the location information of the UE includes the tracking area identifier of the UE, and the LADN is covered by the LADN. The information for the area includes all TAIs within the area covered by the LADN.

Optionally, when the processor 901 triggers the deactivation of the LADN session by the transceiver 902, specifically:

A message for instructing to release the downlink tunnel resource of the LADN session is sent by the transceiver 902 to the user plane function entity; or a message for indicating the release of the air interface resource of the LADN session is sent to the mobility management function entity by the transceiver 902.

The processor 901, the transceiver 902, and the memory 904 are connected to each other through a bus 903. The bus 903 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, and the like.

Here, in FIG. 9, the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 901 and various circuits of memory represented by memory 904. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 902 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium. The processor 901 is responsible for managing the bus architecture and general processing, and the memory 904 can store data used by the processor 901 in performing operations.

Optionally, the processor 901 can be a central processing unit, an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (Complex Programmable Logic Device). , CPLD).

The embodiment of the present application further provides a session processing system. The architecture of the system may be the same as that of the session processing system described above. As shown in FIG. 10, the mobile management function entity 1001 and the session management function entity 1002 are included. The system works as follows:

The session management function entity 1002 sends an event subscription request to the mobility management function entity 1001, which may include the area where the UE leaves the LADN coverage. After receiving the event subscription request sent by the session management function entity 1002, the mobility management function entity 1001, after determining that the UE leaves the area covered by the LADN, sends a first notification message to the session management function entity 1002 for notifying the UE to leave the area covered by the LADN; After receiving the first notification message, the session management function entity 1002 may trigger a first session operation according to the first notification message, where the first session operation includes deactivating a LADN session or releasing a LADN session.

In a specific implementation, after the session management function entity 1002 receives the first notification message, the session management function entity 1002 can trigger the deactivation of the LADN session according to the first notification message, which helps release the UE after leaving the area covered by the LADN. The downlink tunnel resource and the air interface resource occupied by the LADN session improve the utilization of network resources. After the session management function entity 1002 receives the first notification message, the session management function entity 1002 may also release the LADN session according to the first notification message, so that the LADN session of the UE may be retained after the UE leaves the LADN-covered area. The problem of wasted resources. After the session management function entity 1002 receives the first notification message, the session management function entity 1002 may further activate the LADN session according to the first notification message, and determine, according to the situation that the UE re-enters the area covered by the LADN within the preset time period. Whether to release the LADN session. The mobility management function entity 1001 may determine, according to the location information of the UE and the information of the area covered by the LADN stored in advance, the area where the UE leaves the LADN.

In the above session processing system, the event in the event subscription request may further include the UE re-entering the area covered by the LADN. After the mobile management function entity 1001 receives the event subscription request sent by the session management function entity 1002, if the event in the event subscription request includes the UE re-entering the area covered by the LADN, the mobility management function entity 1001 determines that the UE enters the LADN again. The covered area sends a second notification message to the session management function entity 1002 for informing the UE to re-enter the area covered by the LADN. After receiving the second notification message from the mobility management function entity 1001, the session management function entity 1002 triggers a second session operation including activating a LADN session or triggering establishment of a LADN session between the UE and the LADN. The mobility management function entity 1001 may also determine, according to the location information of the UE and the information of the area covered by the LADN stored in advance, the UE enters the area covered by the LADN.

The technical solutions provided by the embodiments of the present application are described in detail below.

The embodiment of the present application further provides a session processing method, as shown in FIG. 11, the method includes:

S1101: The session management function entity sends an event subscription request to the mobility management function entity.

The event in the event subscription request may include an area where the UE leaves the LADN coverage. In case the event in the event subscription request includes the area where the UE leaves the LADN coverage, the event subscription request is used to instruct the mobility management function entity to notify the session management function entity that the UE leaves the area covered by the LADN after determining that the UE leaves the area covered by the LADN. event. Optionally, the event in the event subscription request may further include the area where the UE enters the LADN coverage, where it may be understood that the event further includes the UE entering the area covered by the LADN again after leaving the area covered by the LADN. The event subscription request includes, but is not limited to, the identifier of the UE and the identifier of the LADN, and the identifier of the LADN may be a Local Data Network (NTO) (Local DNN).

Optionally, if the session management function entity wants to subscribe the notification of the event that the UE leaves the area covered by the LADN and the event that the UE enters the area covered by the LADN to the mobility management function entity, the session management function entity may send the message to the mobility management function entity. An event subscription request is implemented, and may be implemented by separately sending two event subscription requests to the mobility management function entity at different times, which is not limited in this embodiment. For example, after the network establishes the LADN session for the UE, the session management function entity sends an event subscription request for notifying the UE of the notification of the event that the UE leaves the area covered by the LADN to the mobility management function entity, where the mobility management function entity determines that the UE leaves the LAND coverage area. After transmitting the first notification message, the session management function entity receives the first notification message and sends an event subscription request to the mobility management function entity for notifying the notification of the event that the UE enters the area covered by the LADN.

S1102: If the mobility management function entity determines that the UE leaves the area covered by the LADN, sends a first notification message to the session management function entity.

After the mobility management function entity in S1102 receives the event subscription request sent by the session management function entity, the mobility management function entity may obtain the identifier of the UE and the identifier of the LADN included in the event subscription request, and then determine whether the UE indicated by the identifier of the UE is leaving. The area covered by the LADN indicated by the LADN's identity. If the mobility management function entity determines that the UE leaves the area covered by the LADN, the mobility management function entity may send a first notification message to the session management function entity for notifying the UE to leave the area covered by the LADN.

The mobility management function entity in S1102 may determine, according to the location information of the UE and the information of the area covered by the LADN, the area where the UE leaves the LADN coverage, the method for determining that the UE leaves the area covered by the LADN, and the session management function entity in S301 above determines whether the UE leaves the LADN. The method of the coverage area is the same. For the specific method, refer to the method for determining whether the UE leaves the area covered by the LADN in the S301, and the details are not described herein.

S1103: The session management function entity triggers the first session operation according to the first notification message.

A LADN session refers to a session for a UE to perform data transmission within an area covered by LADN. Since the LADN session is still active after the UE leaves the area covered by the LADN, and the LADN session can only be used for data transmission by the UE in the area covered by the LADN, it is necessary to prohibit the UE from continuing to pass the activated state after leaving the area covered by the LADN. The LADN session performs data transfer. In addition, since the active LADN session occupies network resources, the LADN session that is active after the UE leaves the LADN-covered area will continue to occupy network resources and cause network resources to be wasted.

After the session management function entity receives the first notification message from the mobility management entity in S1103, the session management function entity may determine that the UE leaves the LADN-covered area according to the first notification message. The first session operation is triggered to prevent the UE from continuing to transmit data through the LADN session in the active state after leaving the area covered by the LADN, releasing the network resources occupied by the LADN session, and improving the utilization of network resources.

The first session operation in the S1103 includes releasing the LADN session or deactivating the LADN session. Here, the session management function entity releases the LADN session, including two cases. The following includes several cases including the first session operation:

Case 1: In the case that the first session operation includes deactivating the LADN session, the session management function entity may send a message to the user plane function entity to indicate that the downlink tunnel resource occupied by the LADN session is released, and the user plane function entity receives the message. The downlink tunnel resource occupied by the LADN session is released; or the session management function entity may send a message to the mobility management function entity to indicate that the air interface resource occupied by the LADN session is released, and the mobility management function entity forwards the message to the radio access network. The radio access network interacts with the UE to release the air interface resources occupied by the LADN session.

It should be noted that, in the first case, the method for the session management function entity to trigger the deactivation of the LADN session is similar to the method for the session management function entity to trigger the deactivation of the LADN session in S302. In the first case, the session management function entity triggers the deactivation of the LADN session. For the specific implementation method, refer to the method for triggering the deactivation of the LADN session by the session management function entity in S302, and details are not described herein again.

Case 2: In the case that the first session operation includes releasing the LADN session, the session management function entity releases the LADN session according to the first notification message, specifically: the session management function entity may directly release the LADN session according to the first notification message.

It should be noted that the specific process of releasing the LADN session by the session management function entity in the foregoing case 2 can be referred to the prior art, and details are not described herein again.

Case 3: In the case that the foregoing first session operation includes releasing the LADN session, the session management function entity releases the LADN session according to the first notification message, specifically: the session management function entity triggers the deactivation of the LADN session according to the first notification message, and Determine whether to release the LADN session according to the case where the UE enters the area covered by the LADN again within the preset duration. If the session management function entity does not detect that the UE re-enters the area covered by the LADN within the preset time period, the session management function entity releases the LADN session.

The following is a method for determining, in the third case, the session management function entity in the case of the preset time, whether the UE enters the area covered by the LADN again.

Method 1: In the event that the event in the event subscription request sent by the session management function entity to the mobility management function entity includes the UE entering the area covered by the LADN, the session management function entity may determine, according to the second notification message from the mobility management function entity, Whether the UE enters the area covered by the LADN again within the preset duration. The second notification message is used to notify the UE to enter the area covered by the LADN. Specifically, if the session management function entity receives the second notification message from the mobility management function entity within the preset duration, the UE re-enters the area covered by the LADN, so that the session management function entity may determine according to the second notification message. The LADN session is released; if the session management function entity does not receive the second notification message from the mobility management function entity within the preset duration, the UE does not enter the LADN coverage area again within the preset duration, so that the session management function entity can Release the LADN session.

Method 2: The session management function entity determines, according to the location information of the UE and the information of the area covered by the LADN stored in advance, whether the UE enters the area covered by the LADN again within the preset time period.

It should be noted that, in the second method, the session management function entity determines whether to release the LADN session according to the case that the UE re-enters the area covered by the LADN within the preset duration, and the session management function entity in S303 determines whether to release the LADN. The method of the session is similar. For details, refer to the method in which the session management function entity determines whether to release the LADN session in S303, and details are not described herein again.

Optionally, in the third case, the timer can be used to preset the preset duration.

After the session management function entity releases the LADN session in the above case 2 and case 3, the session management function entity may send a request for canceling the subscription event to the mobility management function entity. In the event that the event in the event subscription request includes only the area where the UE leaves the LADN coverage, the session management function entity may send a request to the mobility management function entity to unsubscribe from such an event. In the case that the event in the event subscription request includes the area where the UE leaves the LADN coverage and the UE enters the area covered by the LADN, the session management function entity may send a request for canceling the subscription of the two events to the mobility management function entity, or may The mobility management function entity sends a request to unsubscribe from either of these two events.

Optionally, if the event in the event subscription request includes the UE entering the area covered by the LADN, after the session management entity sends the event subscription request to the mobility management function entity, the mobility management function entity determines that the UE enters the LADN coverage area again. Then sending a second notification message to the session management function entity. After receiving the second notification message from the mobility management function entity, the session management function entity may determine that the UE re-enters the area covered by the LADN according to the second notification message, the session management function entity may trigger a second session operation, where The second session operation includes activating a LADN session or triggering a LADN session between the UE and the LADN. The following is a detailed description of several situations included in the second session operation:

Case 1: In the case that the session management function entity triggers the deactivation of the LADN session according to the first notification message, and the session management function entity determines, according to the second notification message, that the UE re-enters the area covered by the LADN, if the session management function entity receives the UE from the UE The SR message for requesting data transmission through the LADN session. Since the LADN session is in a deactivated state at this time, the session management function entity may activate the LADN session activated by the session management function entity according to the first notification message. So that the UE can directly transmit data through the activated LADN session.

Case 2: In the case that the session management function entity releases the LADN session according to the first notification message, the session management function entity determines, after the UE re-enters the area covered by the LADN according to the second notification message, if the session management function entity receives the UE from the UE In the request to establish a LADN session to the LADN session, since the LADN session established by the UE before leaving the area covered by the LADN has been released, the session management function entity may trigger the establishment of the LADN session between the UE and the LADN, and The UE returns a response message indicating that the LADN session establishment between the UE and the LADN is successful, so that the UE can perform data transmission through the established LADN session.

An illustration of five

For example, the process of processing the LADN session by using the independent information interaction process in the 5G system shown in FIG. 2 is as follows. The first session operation triggered by the session management function entity in the process is to deactivate the LADN session. The network element in the 5G system involved in the session processing method of the embodiment of the present application includes a source RAN, a target RAN, an AMF, an SMF, and a UPF. As shown in FIG. 12, the interaction process of each network element is as follows:

S1201: The SMF sends an event subscription request to the AMF.

After the network establishes a LADN session for the UE, the AMF sends an event subscription request to the SMF, the event including the area where the UE leaves the LADN coverage. Optionally, the event may further include the UE entering an area covered by the LADN.

S1202: The target RAN sends the location information of the UE to the AMF.

After the UE switches from the source RAN to the target RAN, the target RAN sends the location information of the UE to the AMF.

S1203. The AMF determines an area where the UE leaves the LADN coverage.

S1204. The AMF sends a first notification message to the SMF.

The first notification message sent by the AMF to the SMF may be used to notify the UE to leave the area covered by the LADN.

Optionally, the AMF in S1204 may also send an update session request message to the SMF, where the update session request message may include information for indicating that the UE leaves the area covered by the LADN.

S1205. The SMF triggers to deactivate the LADN session according to the first notification message.

The SMF triggers the deactivation of the LADN session, including releasing the air interface resource of the LADN session and the N3 tunnel resource. The process of releasing the air interface resource of the LADN session by the AMF and the target RAN in S1205 is the same as the steps S405 to S408 in the interaction process shown in FIG. 4 above. Similarly, the process of releasing the downlink tunnel resource of the LADN session by the UPF is similar to the steps S409 to S410 in the interaction process shown in FIG. 4 above, and details are not described herein again.

S1206. Deactivate the LADN session.

S1207: The target RAN sends the location information of the UE to the AMF.

S1208. The AMF determines that the UE enters an area covered by the LADN.

S1209. The AMF sends a second notification message to the SMF.

The second notification message sent by the AMF to the SMF may be used to notify the UE to enter the area covered by the LADN.

S1210. The UE sends an SR message to the SMF.

The SR message sent by the UE to the SMF may be used to request the UE to perform data transmission through the LADN session.

It should be noted that the sequence between the two steps S1209 and S1210 is not limited in this embodiment.

S1211, SMF triggers activation of the LADN session that the SMF deactivates according to the first notification message.

The process of triggering the activation of the LADN session by the SMF in the above S1210 can be referred to the prior art, and details are not described herein again.

It should be noted that, in the embodiment, the event in the event subscription request sent by the SMF to the AMF in S1201 includes the steps of performing S1206 to S1211 in the case that the UE enters the area covered by the LADN.

For the specific implementation of the steps in the process of the interaction between the network elements shown in FIG. 12, refer to the related descriptions in S801 to S803 above, and details are not described herein again.

An example of six

The process of processing the LADN session by using the independent information exchange process in the 5G system shown in FIG. 2 is an example. The network element in the 5G system involved in the session processing method provided by the embodiment of the present application includes the source RAN and the target. RAN, AMF, SMF, UPF, etc., the interaction process of each network element is as shown in FIG. 13 , wherein the first session operation triggered by the session management function entity in the interaction process is to release the LADN session. The interaction process shown in Figure 13 is similar to the interaction process shown in Figure 12. The similarities between the two are not repeated here. The main difference between the two is the following steps:

S1305. The SMF releases the LADN session according to the first notification message.

For the process of releasing the LADN session in S1305 and S1306, refer to the related descriptions of steps S413 to S415 in the interaction process between the network elements shown in FIG. 4, and details are not described herein again.

Optionally, after the SMF releases the LADN session, the SMF sends a request message for canceling the event subscription to the AMF. If the SMF sends a request message to the AMF for canceling the event that the UE enters the area covered by the LADN, the steps S1310 to S1312 are not performed.

S1310. The UE sends a message to the SMF for requesting to establish a LADN session between the LADNs.

It should be noted that the sequence between the two steps S1309 and S1310 is not limited in this embodiment.

S1311, the SMF establishes a LADN session between the UE and the LADN.

For the process of establishing the LADN session between the UE and the LADN in the foregoing S1311, refer to the related art, and details are not described herein again.

S1312: The SMF returns a response message to the UE.

The response message is used to indicate that the LADN session establishment between the UE and the LADN is successful.

For the specific implementation of the steps S1301 to S1304, S1306 to S1309, and the like in the process of the interaction between the network elements shown in FIG. 13, refer to the related description in the interaction process between the network elements shown in FIG. I won't go into details here.

An example of seven

The process of processing the LADN session by using the independent information interaction process in the 5G system shown in FIG. 2 is an example. The first session operation triggered by the session management function entity in the interaction process is to release the LADN session, which is provided by the embodiment of the present application. The network element in the 5G system involved in a session processing method includes a source RAN, a target RAN, an AMF, an SMF, and a UPF. The interaction process of each network element is as shown in FIG. 14. The interaction process shown in FIG. 14 is similar to the interaction process shown in FIG. 12 and FIG. 13, and the similarities between the interaction process shown in FIG. 14 and the two are not described again. The interaction process shown in FIG. 14 is The main difference between the two is the following steps:

S1405. The SMF triggers deactivation of the LADN session according to the first notification message, and starts a timer.

The SMF triggers the deactivation of the LADN session according to the first notification message, and starts a timer whose preset duration is a preset duration. The start time of the timer may be a time when the SMF determines, according to the first notification message, that the UE leaves the area covered by the LADN.

For the specific implementation of the S1406 in the process of the interaction between the network elements shown in FIG. 14, refer to the related description of S1206 in the interaction process between the network elements shown in FIG. 12, and details are not described herein again.

S1407. The SMF determines whether to release the LADN session according to the detected situation that the UE re-enters the area covered by the LADN within the timing duration of the timer.

If the SMF detects that the UE enters the area covered by the LADN again within the timing of the timer, S1411 is performed, and if the SMF does not detect that the UE enters the area covered by the LADN again within the timing of the timer, S1414 is performed.

For the specific implementation of the steps S1408 to S1410 in the interaction process between the network elements shown in FIG. 14, refer to the related descriptions of S1206 to S1208 in the interaction process between the network elements shown in FIG. No longer.

S1411, SMF determines not to release the LADN session.

In the case that the timer has not timed out, that is, within the timer duration of the timer, if the SMF receives the second notification message, the SMF determines not to release the LADN session and turns off the timer.

For the specific implementation of the steps S1412 to S1413 in the interaction process between the network elements shown in FIG. 14, refer to the related description of S1210 to S1211 in the interaction process between the network elements shown in FIG. No longer.

It should be noted that S1410 needs to be executed before S1411, and S1412 needs to be executed before S1413, but the sequence between the two steps S1210 and S1412 is not limited in this embodiment. For example, the order of execution of the steps S1410 to S1413 from first to last may be: S1412, S1410, S1111, S1413.

S1414, SMF release LADN session.

In the case of a timer timeout, if the SMF still does not receive the second notification message, the SMF releases the LADN session. Optionally, after the SMF releases the LADN session, the SMF sends a request message for canceling the event subscription to the AMF.

For the process of releasing the LADN session in S1414 to S1416, refer to the related descriptions of steps S413 to S415 in the interaction process between the network elements shown in FIG. 4, and details are not described herein again.

For the specific implementation of the steps S1417 to S1422 in the interaction process between the network elements shown in FIG. 14, refer to the related descriptions of steps S1307 to S1312 in the interaction process between the network elements shown in FIG. I will not repeat them here.

The technical solution provided by the embodiment of the present application can reasonably utilize the network resources occupied by the LADN session, and improve the utilization of network resources.

Based on the same application concept, the embodiment of the present application further provides a session management function entity, and the session management function entity can implement the method provided by the embodiment corresponding to FIG. 11 to FIG. Referring to FIG. 15, the session management function entity includes: a transceiver unit 1501 and a processing unit 1502, where

The transceiver unit 1501 is configured to send an event subscription request to the mobility management function entity, where the event includes the area where the user equipment UE leaves the local area data network LADN, and receives the first area from the mobility management function entity for notifying the UE to leave the LADN coverage area. Notification message

The processing unit 1502 is configured to trigger a first session operation according to the first notification message received by the transceiver unit 1501, where the first session operation includes releasing the LADN session or deactivating the LADN session, where the LADN session is used for the UE to perform in the LADN coverage area. The session of data transfer.

Optionally, the processing unit 1502 is specifically configured to: if the first session operation includes releasing the LADN session, releasing the LADN session according to the first notification message; or if the first session operation includes releasing the LADN session, sending and receiving according to the first notification message. The unit 1501 triggers the deactivation of the LADN session and determines whether to release the LADN session according to the case where the UE re-enters the area covered by the LADN within the preset duration.

Optionally, the processing unit 1502 determines, during the preset duration, that the session management function entity determines whether to release the LADN session according to the case that the UE re-enters the area covered by the LADN, and is specifically used to: if the UE does not enter the LADN again within the preset duration The covered area releases the LADN session; or if the UE enters the LADN-covered area again within the preset duration, it is determined that the LADN session is not released.

Optionally, the transceiver unit 1501 is further configured to: after the processing unit 1502 releases the LADN session, send a request for canceling the subscription event to the mobility management function entity.

Optionally, the processing unit 1502 is specifically configured to: if the first session operation includes deactivating the LADN session, send, by the transceiver unit 1501, a message for instructing to release the downlink tunnel resource of the LADN session to the user plane function entity; or The session operation includes deactivating the LADN session, and then transmitting, by the transceiving unit 1501, a message for indicating the release of the air interface resource of the LADN session to the mobility management function entity.

Optionally, the event further includes the UE entering an area covered by the LADN.

Optionally, the transceiver unit 1501 is further configured to: after sending the event subscription request to the mobility management function entity, receive a second notification message from the mobility management function entity for informing the UE to enter the LADN coverage area; the processing unit 1502 further uses After the receiving unit 1501 receives the second notification message, triggering a second session operation according to the second notification message, the second session operation includes activating a LADN session or triggering establishment of a LADN session between the UE and the LADN.

Optionally, the processing unit 1502 triggers the second session operation according to the second notification message, where, in the case that the first session operation includes deactivating the LADN session, if the request is received by the transceiver unit 1501 from the UE. The service request SR message for data transmission of the LADN session is activated by the transceiver unit 1501 according to the second notification message to the LADN session deactivated by the session management function entity according to the first notification message.

Optionally, the processing unit 1502 triggers the second session operation according to the second notification message, specifically:

In the case that the first session operation includes releasing the LADN session, if the message from the UE for requesting establishment of the LADN session between the LADNs is received through the transceiver unit 1501, the establishment of the UE to the LADN is triggered according to the second notification message. LADN session.

The embodiment of the present application further provides a session management function entity, which has the functions provided by the embodiments corresponding to FIG. 11 to FIG. 14 and implements the function of the session management function entity in the embodiment corresponding to FIG. 11 to FIG. . The functions can be implemented in hardware. The session management function entity may be the same device as the session management function entity shown in FIG. Referring to FIG. 16, the session management function entity includes: a processor 1601, a transceiver 1602, a bus 1603, and a memory 1604. The processor 1601, the memory and the transceiver 1602 are connected by a bus, and the memory 1604 is configured to store a computer. a readable program; the processor 1601, instructing the instructions stored in the memory 1604, to perform the method provided by the embodiment corresponding to the foregoing FIGS. 11 to 14 to implement the function of the processing unit in the session management function entity shown in FIG. 15; 1602. For receiving data and/or transmitting data under the control of the processor 1601, to implement the function of the transceiver unit in the session management function entity shown in FIG.

The embodiment of the present application further provides a computer storage medium, where the software program stores a software program, and when the software program is read and executed by one or more processors, the session management function entity in the foregoing embodiment may be implemented. method.

The embodiment of the present application provides a computer program product including instructions, which when executed on a computer, enable the computer to execute the session processing method executed by the session management function entity in the above embodiment. Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware. Moreover, the application can 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, etc.) including computer usable program code.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

It will be apparent to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.

Claims

A session processing method, comprising:

The session management function entity sends an event subscription request to the mobility management function entity, where the event includes an area where the user equipment UE leaves the local area data network LADN;

The session management function entity receives a first notification message from the mobility management function entity for notifying the UE to leave an area covered by the LADN;

The session management function entity triggers a first session operation according to the first notification message, the first session operation includes releasing a LADN session or deactivating a LADN session, where the LADN session is for the UE at the LADN A session for data transfer within the covered area. 2. The method of claim 1, wherein if the first session operation comprises releasing the LADN session, the session management function entity triggers a first session operation according to the first notification message, including :

The session management function entity releases the LADN session according to the first notification message; or

The session management function entity triggers deactivation of the LADN session according to the first notification message, and determines whether to release the LADN session according to a situation in which the UE re-enters the area covered by the LADN within a preset time period. .
The method according to claim 2, wherein the session management function entity determines whether to release the LADN session according to the case that the UE re-enters the area covered by the LADN, including specifically :

The session management function entity releases the LADN session if the UE does not re-enter the area covered by the LADN within the preset duration; or

If the UE enters the area covered by the LADN again within the preset duration, the session management function entity determines not to release the LADN session.
The method of claim 1, wherein if the first session operation comprises deactivating the LADN session, the session management function entity triggers the first session operation according to the first notification message, including:

The session management function entity sends a message to the user plane function entity to indicate that the downlink tunnel resource of the LADN session is released; or

The session management function entity sends a message to the mobility management function entity to indicate that the air interface resource of the LADN session is released.
The method of any of claims 1-4, wherein the event further comprises the UE entering an area covered by the LADN.
The method of claim 5, wherein after the session management function entity sends an event subscription request to the mobility management function entity, the method further includes:

The session management function entity receives a second notification message from the mobility management function entity for notifying the UE to enter an area covered by the LADN;

The session management function entity triggers a second session operation according to the second notification message, the second session operation includes activating the LADN session or triggering establishment of a LADN session between the UE and the LADN.
The method of claim 6, wherein if the first session operation comprises deactivating the LADN session, the session management function entity triggers a second session operation according to the second notification message, including:

If the session management function entity receives a service request SR message from the UE for requesting data transmission through the LADN session, according to the second notification message, the session management function entity is configured according to the The LADN session activated by a notification message is activated.
The method of claim 6, wherein if the first session operation comprises releasing the LADN session, the session management function entity triggers a second session operation according to the second notification message, including:

If the session management function entity receives a message from the UE for requesting establishment of a LADN session between the LADNs, triggering establishment of the UE between the LADNs according to the second notification message LADN session.
The method of any of claims 1-8, wherein the event subscription request comprises an identification of the UE and an identification of the LADN.
The method of claim 9 wherein the identity of the LADN is a local data network identity.
A session management function entity, comprising:

a transceiver unit, configured to send an event subscription request to the mobility management function entity, where the event includes an area that the user equipment UE leaves the local area data network LADN, and receives, from the mobility management function entity, the UE to notify the UE to leave the The first notification message of the area covered by the LADN;

a processing unit, configured to trigger a first session operation according to the first notification message received by the transceiver unit, where the first session operation includes releasing a LADN session or deactivating a LADN session, where the LADN session is used for The UE performs a session for data transmission in the area covered by the LADN.
The session management function entity according to claim 11, wherein the processing unit is specifically configured to:

If the first session operation includes releasing the LADN session, releasing the LADN session according to the first notification message; or

If the first session operation includes releasing the LADN session, triggering, by the transceiver unit, to deactivate the LADN session according to the first notification message, and re-entering the LADN according to the UE within a preset time period. The case of the covered area to determine whether to release the LADN session.
The session management function entity according to claim 13, wherein the processing unit determines whether to release the session management function entity according to a situation in which the UE re-enters the area covered by the LADN within a preset time period. When the LADN session is used, it is specifically used to:

Release the LADN session if the UE does not re-enter the area covered by the LADN within the preset duration; or

If the UE enters the area covered by the LADN again within the preset duration, it is determined that the LADN session is not released.
The session management function entity according to claim 11, wherein the processing unit is specifically configured to:

And if the first session operation includes deactivating the LADN session, sending, by the transceiver unit, a message for instructing to release a downlink tunnel resource of the LADN session to a user plane function entity; or

And if the first session operation includes deactivating the LADN session, sending, by the transceiver unit, a message for instructing to release the air interface resource of the LADN session to the mobility management function entity.
The session management function entity according to any one of claims 11 to 15, wherein the event further comprises the UE entering an area covered by the LADN.
The session management function entity according to claim 16, wherein the transceiver unit is further configured to:

After transmitting an event subscription request to the mobility management function entity, receiving a second notification message from the mobility management function entity for notifying the UE to enter an area covered by the LADN;

The processing unit is further configured to:

After the transceiver unit receives the second notification message, triggering a second session operation according to the second notification message, where the second session operation includes activating the LADN session or triggering establishment of the UE to the LADN. LADN session between.
The session management function entity according to any one of claims 11-17, wherein the event subscription request comprises an identifier of the UE and an identifier of the LADN.
A session processing system, characterized in that the system comprises a session management function entity and a mobility management function entity;

The session management function entity is configured to send an event subscription request to the mobility management function entity, where the event includes an area where the user equipment UE leaves the local area data network LADN;

The mobility management function entity is configured to receive the event subscription request sent by the session management function entity, and send a notification to the session management function entity to notify the location if the UE is determined to leave the area covered by the LADN Determining, by the UE, a first notification message of an area covered by the LADN;

The session management function entity is further configured to receive the first notification message from the mobility management function entity, and trigger a first session operation according to the first notification message, where the first session operation includes releasing a LADN session or The LADN session is deactivated, and the LADN session refers to a session for the UE to perform data transmission within the area covered by the LADN.
The system of claim 19, wherein said session management function entity is operative to perform the method of any of claims 1 to 10.
A session management functional entity, comprising a processor, the processor for coupling with a memory, and reading instructions in the memory and performing the instructions according to any one of claims 1-10 according to the instructions Methods.
A session processing method, comprising:

The session management function entity determines an area where the user equipment UE leaves the local area data network LADN;

The session management function entity triggers a deactivation of a LADN session, where the LADN session refers to a session for the UE to perform data transmission in an area covered by the LADN;

The session management function entity determines whether to release the LADN session according to a situation in which the UE re-enters the area covered by the LADN within a preset duration.
The method according to claim 22, wherein the session management function entity determines whether to release the LADN session according to a situation in which the UE re-enters the area covered by the LADN within a preset time period. include:

The session management function entity releases the LADN session if the UE does not re-enter the area covered by the LADN within the preset duration.
The method according to claim 22, wherein the session management function entity determines whether to release the LADN session according to a situation in which the UE re-enters the area covered by the LADN within a preset time period. include:

If the UE enters the area covered by the LADN again within the preset duration, the session management function entity determines not to release the LADN session.
The method according to claim 24, wherein after the session management function entity determines not to release the LADN session, the method further includes:

The session management function entity triggers activation of the LADN session if it receives a service request SR message from the UE for requesting data transmission through the LADN session.
The method according to any one of claims 22 to 25, wherein after the session management function entity triggers the activation of the LADN session and determines whether to release the LADN session, the method further includes:

And receiving, by the session management function entity, a service request SR message from the UE for requesting data transmission by using the LADN session, sending a response message for indicating that the SR message request fails.
The method according to any one of claims 22 to 26, wherein the session management function entity determines that the user equipment UE leaves the area covered by the local area data network LADN, including:

The session management function entity receives indication information from a mobility management function entity, where the indication information is used to indicate a location of the UE;

The session management function entity determines, based on the indication information, that the UE leaves an area covered by the LADN.
The method of claim 27, wherein the indication information comprises location information of the UE;

The session management function entity determines, according to the indication information, that the UE leaves the area covered by the LADN, including:

If the location indicated by the location information of the UE is not located in an area indicated by the information of the area covered by the LADN pre-stored by the session management function entity, the session management function entity determines that the UE leaves the LADN coverage Area.
The method of claim 27, wherein the indication information comprises information indicating that the UE leaves an area covered by the LADN;

The session management function entity determines, according to the indication information, that the UE leaves the area covered by the LADN, including:

The session management function entity determines, according to the information that is used by the indication information to indicate that the UE leaves the area covered by the LADN, that the UE leaves the area covered by the LADN.
The method according to claim 28, wherein the location information of the UE includes a cell identifier of a cell in which the UE is located, and the information of the area covered by the LADN includes a cell identifier of all cells in the area covered by the LADN ;or

The location information of the UE includes a tracking area identifier TAI of the UE, and the information of the area covered by the LADN includes all TAIs in the area covered by the LADN.
The method according to any one of claims 22 to 30, wherein the session management function entity triggers deactivation of the LADN session, including:

The session management function entity sends a message to the user plane function entity to indicate that the downlink tunnel resource of the LADN session is released; or

The session management function entity sends a message to the mobility management function entity to indicate that the air interface resource of the LADN session is released.
A session management function entity, comprising:

a processing unit, configured to determine an area where the user equipment UE leaves the local area data network LADN;

a transceiver unit, configured to trigger a deactivation of a LADN session, where the LADN session refers to a session for the UE to perform data transmission in an area covered by the LADN;

The processing unit is further configured to determine whether to release the LADN session according to a situation in which the UE re-enters the area covered by the LADN within a preset duration.
The session management function entity according to claim 32, wherein the processing unit determines whether to release the LADN session according to a situation in which the UE re-enters the area covered by the LADN within a preset time period. Specifically used for:

The LADN session is released if the UE does not re-enter the area covered by the LADN within the preset duration.
The session management function entity according to claim 32, wherein the processing unit determines whether to release the LADN session according to a situation in which the UE re-enters the area covered by the LADN within a preset time period. Specifically used for:

If the UE enters the area covered by the LADN again within the preset duration, it is determined that the LADN session is not released.
The session management function entity of claim 34, wherein the processing unit is further configured to:

After determining that the LADN session is not released, if the service request SR message from the UE for requesting data transmission through the LADN session is received by the transceiver unit, triggering activation by the transceiver unit LADN session.
The session management function entity according to any one of claims 32 to 35, wherein the transceiver unit is further configured to:

After triggering the deactivation of the LADN session, and before the processing unit determines whether to release the LADN session, if a service request SR message from the UE for requesting data transmission through the LADN session is received, then The UE sends a response message indicating that the SR message request fails.
The session management function entity according to any one of claims 32 to 36, wherein the processing unit is configured to: when determining that the user equipment UE leaves the area covered by the local area data network LADN, specifically:

Receiving, by the transceiver unit, indication information from a mobility management function entity, where the indication information is used to indicate a location of the UE;

Determining, based on the indication information, that the UE leaves an area covered by the LADN.
The session management function entity according to claim 37, wherein the indication information comprises location information of the UE;

When the processing unit determines that the UE leaves the area covered by the LADN, the processing unit is specifically configured to:

If the location indicated by the location information of the UE is not located in an area indicated by the information of the area covered by the LADN pre-stored by the session management function entity, determining that the UE leaves the area covered by the LADN.
The session management function entity according to claim 37, wherein the indication information comprises information indicating that the UE leaves an area covered by the LADN;

When the processing unit determines that the UE leaves the area covered by the LADN, the processing unit is specifically configured to:

Determining, according to the information that the indication information is used to indicate that the UE leaves the area covered by the LADN, determining that the UE leaves an area covered by the LADN.
The session management function entity according to claim 38, wherein the location information of the UE includes a cell identifier of a cell where the UE is located, and the information of the area covered by the LADN includes all cells in the area covered by the LADN. Cell identity; or

The location information of the UE includes a tracking area identifier TAI of the UE, and the information of the area covered by the LADN includes all TAIs in the area covered by the LADN.
The session management function entity according to any one of claims 32 to 40, wherein when the transceiver unit triggers deactivation of the LADN session, it is specifically used for:

Sending a message to the user plane function entity indicating that the downlink tunnel resource of the LADN session is released; or

A message is sent to the mobility management function entity to indicate that the air interface resource of the LADN session is released.
A session management function entity, wherein the session management function entity comprises a memory, a processor, and a transceiver; wherein

The memory for storing a computer readable program;

The processor executes the method of any one of claims 22 to 31 by running a program in the memory;

The transceiver is configured to receive data and/or transmit data under the control of the processor.
A session processing system, characterized in that the system comprises a mobility management function entity and a session management function entity;

The mobility management function entity is configured to send indication information to the session management function entity, where the indication information is used to indicate a location of the user equipment UE;

The session management function entity is configured to receive the indication information sent by the mobility management function entity, determine, according to the indication information, an area that the UE leaves the local area data network LADN, and trigger a deactivation of the LADN session, The LADN session refers to a session for the UE to perform data transmission in the area covered by the LADN; determining whether to release the LADN according to the case that the UE re-enters the area covered by the LADN within a preset duration Conversation.
The system of claim 43 wherein said session management function entity is operative to perform the method of any of claims 23 to 31.