WO2018201989A1

WO2018201989A1 - Method and device for establishing pdu session

Info

Publication number: WO2018201989A1
Application number: PCT/CN2018/084851
Authority: WO
Inventors: 熊春山; 孙海洋; 吴义壮
Original assignee: 华为技术有限公司
Priority date: 2017-05-05
Filing date: 2018-04-27
Publication date: 2018-11-08
Also published as: CN109246769B; CN109246769A

Abstract

A method and device for establishing a PDU session. The method comprises: a terminal determines, according to a roaming policy comprised in a first message, whether local breakout is allowed by a PDU session to be established, and generates a PDU session establishment request; and because the PDU session establishment request comprises first indication information indicating whether the local breakout is allowed by the PDU session to be established, an AMF network element receiving the PDU session establishment request can generate a session management request according to the first indication information, thereby establishing a PDU session of HPLMN or a PDU session of VPLMN. Compared with the prior art in which the PDU session to be established which is identified according to a SM capacitor is required to be home routed, the solution in the present application uses only one SM capacitor without increasing the number of the SM capacitors, thereby effectively avoiding the problem of complicated NAS messages.

Description

Method and device for establishing PDU session

This application claims the priority of the Chinese patent application filed on May 5, 2017, submitted to the Intellectual Property Office of the People's Republic of China, application number 201710313933.X, and the invention name is "a PDU session establishment method and device". The citations are incorporated herein by reference.

Technical field

The present application relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for establishing a PDU session.

Background technique

In a next-generation wireless communication system, for example, in a New Radio (NR) system, a terminal establishes protocol data through a User Plane Function (UPF) network element and a Data Network (DN) network element. A Protocol Data Unit (PDU) session, the PDU session provides a PDU connection service between the terminal and the DN network element.

When the terminal is located at the home location, the PDU session used to provide the PDU connection service is a PDU session of the Home Public Land Mobile Network (HPLMN); and when the terminal is located at the visited place (ie, the roaming scenario), A possible scenario is home-routed. In this case, the PDU session used to provide the PDU connection service is a PDU session of the HPLMN, and another possible case is local breakout. The PDU session used to provide the PDU connection service is a PDU session of the visited Public Land Mobile Network (VPLMN). In a roaming scenario, certain specific services have specific requirements for PDU sessions. For example, a PDU session of the HPLMN must be utilized to provide a PDU connection service. Therefore, when establishing a PDU session, it is necessary to identify whether the PDU session to be established must perform home routing, thereby ensuring normal transmission of data services.

Summary of the invention

The present application provides a method and a device for establishing a PDU session, which are used to effectively identify whether a PDU session to be established must be home routed, and ensure normal transmission of data services.

In a first aspect, the application provides a PDU session establishment method, including:

Receiving, by the terminal, a first message, where the first message includes a roaming policy of the terminal;

Determining, according to the roaming policy, whether the PDU session to be established is allowed to perform local grooming, and generating a PDU session establishment request; the PDU session establishment request includes, to indicate whether the PDU session to be established is allowed to perform local grooming An indication message;

The terminal sends the PDU session establishment request to the access and mobility management function AMF network element.

In this manner, the terminal determines, according to the roaming policy included in the first message, whether the PDU session to be established is allowed to perform local grooming, and generates a PDU session establishment request. The PDU session establishment request includes indicating whether the PDU session to be established is allowed to be performed. The first indication information of the local grooming, so that the AMF network element that receives the PDU session establishment request can generate a session management request according to the first indication information, thereby establishing a PDU session of the HPLMN or a PDU session of the VPLMN. Compared with the prior art, the PDU session to be established according to the SM container must be configured to perform home routing. The solution in the present application can use only one SM container, and the number of SM containers is not required, thereby effectively avoiding complicated NAS messages. The problem.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the roaming policy includes a type of a PDU session that is not allowed to perform local grooming;

The terminal determines, according to the roaming policy, whether the PDU session to be established is allowed to perform local grooming, including:

The terminal determines that the type of the PDU session to be established belongs to the type of the PDU session that is not allowed to be locally groomed, and determines that the PDU session to be established is not allowed to perform local grooming.

In this manner, the terminal can determine whether the PDU session to be established is allowed to perform local grooming by determining whether the type of the PDU session to be established belongs to a type of the PDU session that is not allowed to be locally queried. The implementation process is relatively simple and fast.

With reference to the first aspect, in a second possible implementation manner of the first aspect, the roaming policy includes a correspondence between a type of a PDU session and a roaming identifier, where the roaming identifier is used to indicate a type corresponding to the roaming identifier. Whether the PDU session allows local grooming;

And determining, by the terminal, the roaming identifier corresponding to the type of the PDU session to be established, according to the type of the PDU session to be established and the roaming policy.

With reference to the first aspect, and the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the PDU session to be established is allowed to perform local grooming, including:

The PDU session to be established allows for local grooming and is authorized by the home land mobile network HPLMN; or

The PDU session to be established allows for local grooming without the need for HPLMN authorization.

In a second aspect, the application provides a PDU session establishment method, including:

The AMF network element receives a PDU session establishment request from the terminal, where the PDU session establishment request includes first indication information indicating whether the PDU session to be established is allowed to perform local grooming;

And generating, by the AMF network element, a session management request according to the first indication information, where the session management request is used to request to establish the PDU session.

With reference to the second aspect, in a first possible implementation manner of the second aspect, when the first indication information indicates that the PDU session to be established is not allowed to perform local grooming, the session management request includes the The identification information of the SMF network element of the home location selected by the AMF network element, the session management request is used to request to establish a PDU session of the HPLMN.

With reference to the second aspect, in a second possible implementation manner of the second aspect, when the first indication information indicates that the PDU session to be established allows local grooming, the session management request is used to request to establish a VPLMN PDU session.

With reference to the second aspect, and the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, when the first indication information indicates that the PDU session to be established is allowed to perform local grooming When the HPLMN authorization is required, the session management request includes second indication information for indicating that the PDU session to be established needs to perform HPLMN authorization, and the session management request is used to request that the HPLMN authorization is performed, and the VPLMN is established. PDU session.

In a third aspect, the application provides a terminal, where the terminal includes: a receiver, a transmitter, and a processor;

The receiver is configured to receive a first message, where the first message includes a roaming policy of the terminal;

The processor is configured to determine, according to the roaming policy, whether a PDU session to be established is allowed to perform local grooming, and generate a PDU session establishment request; where the PDU session establishment request includes indicating whether the PDU session to be established is allowed to be performed. First indication information of local grooming;

The transmitter is configured to send the PDU session establishment request to an access and mobility management function AMF network element.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the roaming policy includes a type of a PDU session that is not allowed to perform local grooming;

The processor is specifically configured to:

If the type of the PDU session to be established belongs to the type of the PDU session that is not allowed to be locally groomed included in the roaming policy, it is determined that the PDU session to be established is not allowed to perform local grooming.

With reference to the third aspect, in a second possible implementation manner of the third aspect, the roaming policy includes a correspondence between a type of a PDU session and a roaming identifier, where the roaming identifier is used to indicate a type corresponding to the roaming identifier. Whether the PDU session allows local grooming;

The processor is specifically configured to:

And determining, according to the type of the PDU session to be established and the roaming policy, a roaming identifier corresponding to the type of the PDU session to be established.

With reference to the third aspect, and the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the PDU session to be established is allowed to perform local grooming, including:

In a fourth aspect, the application provides an AMF network element, where the AMF network element includes: a receiver, a transmitter, and a processor;

The receiver is configured to receive a PDU session establishment request from a terminal, where the PDU session establishment request includes first indication information used to indicate whether a PDU session to be established is allowed to perform local grooming;

The processor is configured to generate a session management request according to the first indication information;

The sender is configured to send the session management request, where the session management request is used to request to establish the PDU session.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, when the first indication information indicates that the PDU session to be established is not allowed to perform local grooming, the session management request includes the The identification information of the SMF network element of the home location selected by the AMF network element, the session management request is used to request to establish a PDU session of the HPLMN.

With reference to the fourth aspect, in a second possible implementation manner of the fourth aspect, when the first indication information indicates that the PDU session to be established allows local grooming, the session management request is used to request to establish a VPLMN PDU session.

With reference to the fourth aspect, and the second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, when the first indication information indicates that the PDU session to be established is allowed to perform local grooming When the HPLMN authorization is required, the session management request includes second indication information for indicating that the PDU session to be established needs to perform HPLMN authorization, and the session management request is used to request that the HPLMN authorization is performed, and the VPLMN is established. PDU session.

In a fifth aspect, the application provides a communication entity, where the communication entity is configured to perform a method flow performed by a terminal in the foregoing PDU session establishment method. The communication entity can be a terminal.

In a sixth aspect, the application provides a communication entity, where the communication entity is configured to perform a method flow performed by an AMF network element in the foregoing PDU session establishment method. The communication entity can be an AMF network element.

The present application also provides a computer storage medium having stored therein a software program that, when read and executed by one or more processors, implements the various aspects described above or various possible implementations. PDU session establishment method.

The present application also provides a computer program product comprising instructions which, when executed on a computer, cause the computer to perform the PDU session establishment method described in the various aspects or various possible implementations described above.

The present application also provides a computer program that, when run on a computer, causes the computer to perform the PDU session establishment method described in the various aspects or various possible implementations described above.

In this application, the terminal determines whether the PDU session to be established is allowed to perform local grooming according to the roaming policy included in the first message, and generates a PDU session establishment request. The PDU session establishment request includes a PDU session to indicate whether the PDU session to be established is included. The first indication information for local grooming is allowed, so that the AMF network element that receives the PDU session establishment request can generate a session management request according to the first indication information, thereby establishing a PDU session of the HPLMN or a PDU session of the VPLMN. Compared with the prior art, the PDU session to be established according to the SM container must be configured to perform home routing. The solution in the present application can use only one SM container, and the number of SM containers is not required, thereby effectively avoiding complicated NAS messages. The problem.

DRAWINGS

Figure 1 is a schematic diagram of a possible 5G network architecture;

2A is a network architecture diagram of a home routing scenario;

2B is a network architecture diagram of a first local grooming scenario;

2C is a network architecture diagram of a second local grooming scenario;

FIG. 3 is a schematic flowchart of a method for establishing a PDU session according to Embodiment 1 of the present application;

4 is a schematic diagram of a process of establishing a PDU session in Embodiment 2 of the present application;

5 is a schematic diagram of a process of establishing a PDU session in Embodiment 3 of the present application;

6 is a schematic diagram of a process of establishing a PDU session in Embodiment 4 of the present application;

FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of an AMF network element according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a communication entity according to an embodiment of the present application;

FIG. 10 is a schematic structural diagram of another communication entity according to an embodiment of the present application.

detailed description

The embodiments of the present application are specifically described below in conjunction with the accompanying drawings.

The embodiments of the present application can be applied to various mobile communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, and Wideband Code Division Multiple Access (Wideband). Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, general purpose Other mobile communication systems such as the Universal Mobile Telecommunication System (UMTS), the evolved Long Term Evolution (eLTE) system, and the 5G (eg, NR system).

There are many possible architectures in the 5G network architecture under discussion. Figure 1 is a schematic diagram of a possible 5G network architecture. As shown in Figure 1, the network architecture includes an Authentication Server Function (AUSF) network element and a Unified Data Management (UDM) network element. Access and Mobility Management Function (AMF) network element, session management function (SMF) network element, policy control function (PCF) network element, application function (Application) Function, AF) network element, Radio Access Network (RAN) network element (also known as access network element), User Plane Function (UPF) network element, data network (Data Network) , DN) network elements and terminals.

The SMF network element is responsible for session management, Internet Protocol (IP) address allocation and management of the terminal, and the like. The AMF network element is responsible for access and mobility management. It is the endpoint of the interface between NG2 (the interface between the AMF and the RAN device). It terminates the non-access stratum (NAS) message, completes the registration management, and manages the connection. And reachability management, mobility management, etc., and transparent routing session management (SMS) messages to SMF network elements. The UPF network element is a user plane function device, which is responsible for routing and forwarding of data packets, lawful interception, and downlink data packet buffering and triggering downlink data packet notification messages.

In the present application, the terminal may be a wireless terminal for providing voice and/or data connectivity to the user. The wireless terminal can be a handheld device with wireless connectivity, or other processing device connected to a wireless modem, and a mobile terminal that communicates with one or more core networks via a wireless access network. For example, the wireless terminal can be a mobile phone, a computer, a tablet, a personal digital assistant (PDA), a mobile Internet device (MID), a wearable device, and an e-book reader (e). -book reader)etc. As another example, the wireless terminal can also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device. For another example, the wireless terminal can be part of a mobile station, an access point, or a user equipment (UE).

For the network architecture shown in Figure 1, the following roaming scenarios are discussed in the 5G standard: (1) home route scenario; (2) local grooming scenario.

2A is a network architecture diagram of a home routing scenario. As shown in FIG. 2A, the network architecture includes a network element of a HPLMN and a network element of a VPLMN. The network element of the HPLMN includes an AUSF network element, a UDM network element, and a home location. SMF network element (also referred to as H-SMF network element), PCF network element at home (also referred to as H-PCF network element), AF network element, and UPF network element at the home (also called H- The network elements of the VPLMN include the PCF network element (also referred to as a V-PCF network element) in the visited area, and the SMF network element (also referred to as a V-SMF network element) in the visited area. The AMF network element, the RAN network element, and the UPF network element (also referred to as a V-UPF network element) and the terminal at the visited place. In conjunction with the architecture shown in FIG. 2A, the home route means that the V-SMF cannot process the SM information in the NAS signaling when the PDU session is established. Therefore, the network element of the HPLMN needs to complete the establishment of the PDU session.

The local grooming scenario can be further divided into two types. FIG. 2B is a network architecture diagram of the first local grooming scenario. As shown in FIG. 2B, the network architecture includes a network element of the HPLMN and a network element of the VPLMN, wherein the network of the HPLMN The element includes an AUSF network element, a UDM network element, an H-PCF network element, and an AF network element; the network elements of the VPLMN include a V-PCF network element, an SMF network element, an AMF network element, a RAN network element, a UPF network element, and a DN network element. And terminal. 2C is a network architecture diagram of a second local grooming scenario. As shown in FIG. 2C, the network architecture includes a network element of the HPLMN and a network element of the VPLMN. The network element of the HPLMN includes an AUSF network element and a UDM network element. The network element of the V-PCF network element includes a V-PCF network element, an AF network element, an SMF network element, an AMF network element, a RAN network element, a UPF network element, a DN network element, and a terminal.

2B and FIG. 2C, the local grooming means that the V-SMF can process the SM information in the NAS signaling when establishing the PDU session, so that the establishment of the PDU session can be completed by the network element of the VPLMN.

Considering that in a roaming scenario, certain services must utilize the HPLMN PDU session to provide PDU connectivity services. Therefore, when establishing a PDU session, it is necessary to distinguish whether the PDU session to be established must be home routed. To solve this problem, one implementation in the prior art is a session management (SM) container carried by the AMF network element according to the (Non-access stratum, NAS) message sent by the terminal. The number of the PDU session to be established must be determined by the home route. The information that can be processed by the SMF network element in the visited place is placed in an SM container, and the information that must be processed by the home SMF network element is placed separately. Added in the SM container. Specifically, if only one SM container is included in the NAS message sent by the terminal, the PDU session to be established does not need to perform home routing, and if two SM containers are included, the PDU session to be established must be home routed. However, using this method will result in a larger number of SM containers, which makes NAS messages more complicated.

Based on this, the present application provides a PDU session establishment method for effectively identifying whether a PDU session to be established must be home routed, thereby establishing a PDU session according to the identification result, and ensuring normal transmission of data services; and effectively avoiding the prior art. NAS messages are more complicated.

Embodiment 1

FIG. 3 is a schematic flowchart of a method for establishing a PDU session according to Embodiment 1 of the present application. As shown in FIG. 3, the process includes:

Step 301: The terminal receives a first message, where the first message includes a roaming policy of the terminal.

Step 302: The terminal determines, according to the roaming policy, whether the PDU session to be established is allowed to perform local grooming, and generates a PDU session establishment request. The PDU session establishment request includes indicating whether the PDU session to be established is allowed to be locally mediated. First indication information;

Step 303: The terminal sends the PDU session establishment request to the AMF network element.

Step 304: The AMF network element receives a PDU session establishment request from the terminal.

Step 305: The AMF network element generates a session management request according to the first indication information, and sends the session management request.

It is to be noted that, in the present application, the terminal determines whether the PDU session to be established is allowed to perform local grooming according to the roaming policy included in the first message, and generates a PDU session establishment request; and the PDU session establishment request includes Whether the established PDU session allows the first indication information of the local grooming, so that the AMF network element that receives the PDU session establishment request can generate a session management request according to the first indication information, thereby establishing a PDU session of the HPLMN or a PDU session of the VPLMN . Compared with the prior art, the PDU session to be established according to the SM container must be configured to perform home routing. The solution in the present application can use only one SM container, and the number of SM containers is not required, thereby effectively avoiding complicated NAS messages. The problem.

Specifically, in step 301, the roaming policy of the terminal may be allocated by the H-PCF network element to the terminal, or the roaming policy of the terminal may be allocated and sent by the H-PCF network element to the terminal. The V-PCF network element is further sent to the terminal by the V-PCF network element. The H-PCF network element can update the roaming policy of the terminal. For example, after the H-PCF determines that the subscription information of the user changes, the roaming policy of the terminal can be updated.

In a first possible implementation manner, the roaming policy of the terminal may include a correspondence between a type of the PDU session and a roaming identifier.

The type of the PDU session may be distinguished according to the terminal identifier and the application identification. For example, the terminal identifier is a1, the application identifier is b1 for the first type, the terminal identifier is a1, and the application identifier is b2 for the second type. Types, etc. The roaming identity can be represented by various forms of information, for example, using bits 0 and 1 to indicate that the roaming identity is 0, indicating that local grooming is not allowed, and the roaming identity is 1, indicating that local grooming is allowed. As shown in Table 1, part of the content of the PDU session and the first correspondence of the roaming identifier are indicated.

Table 1: Part of the content of the PDU session and the first correspondence of the roaming identifier

PDU会话的类型Type of PDU session	漫游标识Roaming logo
终端标识为a1、应用标识为b1The terminal identifier is a1 and the application identifier is b1.	00
终端标识为a1、应用标识为b2The terminal identifier is a1 and the application identifier is b2.	11
终端标识为a1、应用标识为b3The terminal identifier is a1 and the application identifier is b3.	11
……......	……......
终端标识为a1、应用标识为bnThe terminal identifier is a1 and the application identifier is bn.	00

In Table 1, the terminal identifier is a1, and the first type represented by the application identifier b1 corresponds to the roaming identifier 0, that is, the PDU session belonging to the first type is not allowed to perform local grooming; the terminal identifier is a1, and the application identifier is b2. The second type corresponds to the roaming identity 1, that is, the PDU session belonging to the second type allows local grooming.

It should be noted that, because the roaming policy received by the terminal is usually a roaming policy that the H-PCF network element allocates for the terminal according to the terminal identifier, the application identifier may also be used to represent the type of the PDU session.

Further, it is considered that the PDU session to be established allows local grooming to include two situations (respectively: the PDU session to be established allows local grooming, and the HPLMN authorization is required; the PDU session to be established allows local grooming, and does not need For HPLMN authorization), for further differentiation, the roaming identifier may also be set to two bits, where the first bit is used to indicate whether local grooming is allowed, and the second bit is used to indicate two situations where local grooming is allowed, for example The roaming identifier 00 (or the roaming identifier 01) indicates that local grooming is not allowed; the roaming identifier is 11, indicating that the PDU session to be established is allowed to perform local grooming, and the HPLMN authorization is required; and the roaming identifier is 10, indicating the PDU to be established. The session allows for local grooming without the need for HPLMN authorization. As shown in Table 2, part of the content of the PDU session and the second correspondence of the roaming identifier are indicated.

Table 2: part of the content of the PDU session and the second correspondence of the roaming identifier

PDU会话的类型Type of PDU session	漫游标识Roaming logo
应用标识为b1Application ID is b1	0000
应用标识为b2Application ID is b2	1010
应用标识为b3Application ID is b3	1111
……......	……......
应用标识为bnApp ID is bn	0000

According to the method in Table 2, if the terminal determines that the first bit of the roaming identifier corresponding to the type of the PDU session to be established is 0, it can directly determine that the PDU session to be established is not allowed to perform local grooming, and no need to judge the second. Bit bits, thereby saving processing resources; if it is determined that the first bit is 1, the second bit can be further determined to distinguish between two situations that allow local grooming.

In this application, the type of the PDU session may also be distinguished by using the terminal identifier and the data network name (DNN), that is, the application identifiers in the foregoing Table 1 and Table 2 may be replaced by the DNN, and details are not described herein.

It should be noted that, in consideration of the fact that the DNN includes an operator identification, the terminal may directly determine, according to the operator identifier, whether the PDU session to be established allows local grooming, and therefore may not be included in the DNN in this application. In the case of the operator identifier, the terminal identifier and the DNN are used to distinguish the type of the PDU session, and then the roaming policy is set.

In the foregoing first possible implementation manner, the terminal roaming policy includes the correspondence between the type of the PDU session and the roaming identifier. Therefore, in step 302, the terminal may obtain the to-be-established according to the type of the PDU session to be established. The roaming identifier corresponding to the PDU session determines whether the PDU session to be established allows local grooming.

The second possible implementation manner, the roaming policy of the terminal may include a type of the PDU session that is not allowed to be locally queried. For example, if the application identifier is b1 and the application identifier is bn, the application identifier is b1 A PDU session of the type identified as bn does not allow local grooming, while other types of PDU sessions allow for local grooming.

In the foregoing second possible implementation manner, the roaming policy only needs to include the type of the PDU session that is not allowed to perform local grooming, thereby effectively reducing the complexity of the roaming policy. In step 302, the terminal may determine whether the type of the PDU session to be established is the same as the type included in the roaming policy. If the same, the terminal determines that the PDU session to be established is not allowed to perform local grooming. Otherwise, the PDU session to be established is allowed to be established. Conduct local grooming.

As a variant of the second possible implementation, the roaming policy of the terminal may also include the type of the PDU session that is allowed to perform the local grooming. For example, if the application identifier is b3 in the roaming policy, the application identifier is b3. A representative PDU session allows for local grooming, while other types of PDU sessions do not allow for local grooming.

According to the foregoing, the first possible implementation manner (when the roaming identifier is represented by 0 and 1) and the second possible implementation manner, the terminal can distinguish whether the PDU session to be established allows local grooming, and further The terminal may generate a PDU session establishment request including the first indication information. At this time, since the two situations that allow local grooming are not distinguished, the first indication information only indicates that the PDU session to be established is allowed to be locally mediated. The local indication is not allowed. For example, similar to the roaming identifier, the first indication information may also be represented by 0 and 1. The first indication information is 0, indicating that local grooming is not allowed; the first indication information is 1, Indicates that local grooming is allowed.

In this application, the roaming scenario specifically includes three types, that is, (1) local paging is not allowed, that is, a home routing scenario; (2) local grooming is allowed, and HPLMN authorization is required; (3) local grooming is allowed, There is no need for HPLMN authorization. In order to clearly distinguish the above three types of roaming scenarios, the first possible implementation manner is adopted (when the roaming identifier is represented by two bits), the terminal can distinguish which roaming the PDU session to be established belongs to. The scenario, in turn, generates a PDU session establishment request including the first indication information. Similar to the roaming identifier, the first indication information may also be represented by two bits. The first indication information is 00 or 01, indicating that local grooming is not allowed; the first indication information is 10, indicating that local grooming is allowed, and no need to be performed. HPLMN authorization; the first indication is 11, indicating that local grooming is allowed and HPLMN authorization is required. The following description will be made by way of example.

In step 304 and step 305, the AMF network element receives the PDU session establishment request from the terminal. If the first indication information is 00 or 01, the scenario is determined to be a roaming scenario (1), that is, a home route, and the AMF network element is selected to belong to the home network. The SMF network element of the ground and the SMF network element of the visited place, and generate a session management request, and send a session management request to the SMF network element of the visited place, where the session management request includes the identification information of the SMF network element of the home location.

If the first indication information is 11, determining that the scenario is a roaming scenario (2), that is, allowing local grooming, and performing HPLMN authorization, the AMF network element selecting the visited SMF network element, and generating a session management request, and Sending a session management request to the SMF network element of the visited place, where the session management request includes second indication information, where the second indication information is used to indicate that the PDU session to be established needs to perform HPLMN authorization.

If the first indication information is 10, determining that the scenario is a roaming scenario (3), that is, allowing local grooming, and without performing HPLMN authorization, the AMF network element selects the SMF network element of the visited place, and generates a session management request, to The SMF network element of the visited place sends a session management request.

In summary, the present application provides a new idea for identifying different roaming scenarios. Specifically, the terminal determines whether the PDU session to be established is allowed to perform local grooming according to the roaming policy, and generates a PDU session establishment request due to the PDU session. The setup request includes the first indication information, so that after receiving the first indication information, the AMF network element can accurately and quickly identify different roaming scenarios, thereby triggering a process of establishing a MPLS session of the HPLMN or a process of establishing a PDU session of the VPLMN.

The process of establishing a PDU session in the above three roaming scenarios will be described below with reference to the second embodiment to the fourth embodiment.

Embodiment 2: Describe the process of establishing a PDU session in a home route scenario

Based on the network architecture shown in FIG. 2A, FIG. 4 is a schematic diagram of a process of establishing a PDU session in Embodiment 2 of the present application. As shown in Figure 4, it includes:

Step 401: The terminal receives a first message, where the first message includes a roaming policy of the terminal.

Step 402: The terminal determines, according to the roaming policy, whether the PDU session to be established is allowed to perform local grooming, and generates a PDU session establishment request. The PDU session establishment request includes first indication information, where the first indication information indicates to be established. The PDU session does not allow local grooming, that is, the home route must be performed;

Step 403: The terminal sends the PDU session establishment request to the AMF network element.

Step 404: The AMF network element receives a PDU session establishment request from the terminal.

Step 405: The AMF network element selects an H-SMF network element and a V-SMF network element according to the first indication information, generates a session management request, and sends a session management request to the V-SMF network element, where the session management request includes H- Identification information of the SMF network element;

Step 406: The V-SMF network element selects a UPF network element (that is, a V-UPF network element) in the visited area, and sends an N4 session establishment request to the V-UPF network element.

Step 407: The V-UPF network element sends an N4 session establishment response to the V-SMF network element.

Step 408: The V-SMF network element sends a request for creating a PDU session to the H-SMF network element.

Step 409, the V-SMF network element receives a request to create a PDU session, and establishes a PDU session of the HPLMN.

It should be noted that the PDU session to be established mentioned in this application is not allowed to be locally queried (the home route must be performed), that is, the PDU session to be established needs to pass the process described in steps 403 to 409 above. set up.

Embodiment 3: Describe the process of establishing a PDU session in a local grooming (and requiring HPLMN authorization) scenario

Based on the network architecture shown in FIG. 2B, FIG. 5 is a schematic diagram of a process of establishing a PDU session in Embodiment 3 of the present application. As shown in Figure 5, it includes:

Step 501: The terminal receives a first message, where the first message includes a roaming policy of the terminal.

Step 502: The terminal determines, according to the roaming policy, whether the PDU session to be established is allowed to perform local grooming, and generates a PDU session establishment request. The PDU session establishment request includes first indication information, where the first indication information indicates to be established. The PDU session allows for local grooming and requires HPLMN authorization;

Step 503: The terminal sends the PDU session establishment request to the AMF network element.

Step 504: The AMF network element receives a PDU session establishment request from the terminal.

Step 505: The AMF network element selects a V-SMF network element according to the first indication information, generates a session management request, and sends a session management request to the V-SMF network element, where the session management request includes second indication information, and the second indication The information is used to indicate that the PDU session to be established needs to be authorized by the HPLMN;

Step 506: The V-SMF network element selects the V-PCF network element, and sends a PDU-CAN session establishment request to the V-PCF network element. The PDU-CAN session establishment request includes the HPLMN authorization for indicating the PDU session to be established. Instructions;

Step 507: The V-PCF network element sends a PDU-CAN session authorization request to the H-PCF network element.

Step 508: The H-PCF network element returns a PDU-CAN session authorization response to the V-PCF network element.

Step 509: The V-PCF network element sends a PDU-CAN session establishment response to the V-SMF network element.

Step 510: The V-SMF network element receives the PDU-CAN session setup response and establishes a VPLMN PDU session.

It should be noted that the PDU session to be established mentioned in this application is allowed to perform local grooming (and the HPLMN authorization is required), that is, the PDU session to be established can be performed through the process described in steps 503 to 510 above. set up.

Embodiment 4: Describe the process of establishing a PDU session in a scenario of local grooming (and without requiring HPLMN authorization)

Based on the network architecture shown in FIG. 2C, FIG. 6 is a schematic diagram of a process of establishing a PDU session in Embodiment 4 of the present application. As shown in Figure 6, it includes:

Step 601: The terminal receives a first message, where the first message includes a roaming policy of the terminal.

Step 602: The terminal determines, according to the roaming policy, whether the PDU session to be established is allowed to perform local grooming, and generates a PDU session establishment request. The PDU session establishment request includes first indication information, where the first indication information indicates to be established. The PDU session allows for local grooming without the need for HPLMN authorization;

Step 603: The terminal sends the PDU session establishment request to the AMF network element.

Step 604: The AMF network element receives a PDU session establishment request from the terminal.

Step 605: The AMF network element selects a V-SMF network element according to the first indication information, generates a session management request, and sends a session management request to the V-SMF network element.

Step 606: After receiving the session management request, the V-SMF network element establishes a PDU session of the VPLMN.

It should be noted that the PDU session to be established mentioned in the present application allows for local grooming (and does not need to perform HPLMN authorization), that is, the PDU session to be established can be performed through the process described in steps 603 to 606 above. set up.

FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 7, the terminal 700 includes: a transmitter 701a, a receiver 701b, a processor 702, a memory 703, and a bus system 704;

The memory 703 is used to store a program. In particular, the program can include program code, the program code including computer operating instructions. The memory 703 may be a random access memory (RAM) or a non-volatile memory such as at least one disk storage. Only one memory is shown in the figure, of course, the memory can also be set to a plurality as needed. Memory 703 can also be a memory in processor 702.

The memory 703 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:

Operation instructions: include various operation instructions for implementing various operations.

Operating system: Includes a variety of system programs for implementing various basic services and handling hardware-based tasks.

The processor 702 controls the operation of the terminal 700, which may also be referred to as a CPU (Central Processing Unit). In a specific application, the various components of the terminal 700 are coupled together by a bus system 704. The bus system 704 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 704 in the figure. For ease of representation, only the schematic drawing is shown in FIG.

The method disclosed in the foregoing embodiment of the present application may be applied to the processor 702 or implemented by the processor 702. Processor 702 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 702 or an instruction in a form of software. The processor 702 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or discrete hardware. Component. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 703, and the processor 702 reads the information in the memory 703 and performs the method steps performed by the above terminal in conjunction with its hardware.

FIG. 8 is a schematic structural diagram of an AMF network element according to an embodiment of the present invention. As shown in FIG. 8, the AMF network element 800 includes: a transmitter 801a, a receiver 801b, a processor 802, a memory 803, and a bus system 804;

The memory 803 is used to store a program. In particular, the program can include program code, the program code including computer operating instructions. The memory 803 may be a random access memory (RAM) or a non-volatile memory, such as at least one disk storage. Only one memory is shown in the figure, of course, the memory can also be set to a plurality as needed. Memory 803 can also be a memory in processor 802.

The memory 803 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:

The processor 802 controls the operation of the AMF network element 800, which may also be referred to as a CPU (Central Processing Unit). In a specific application, the components of the AMF network element 800 are coupled together by a bus system 804. The bus system 804 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 804 in the figure. For ease of representation, only the schematic drawing is shown in FIG.

The method disclosed in the foregoing embodiment of the present application may be applied to the processor 802 or implemented by the processor 802. Processor 802 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 802 or an instruction in a form of software. The processor 802 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or discrete hardware. Component. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in memory 803, and processor 802 reads the information in memory 803 in conjunction with its hardware to perform the method steps performed by the above AMF network elements.

Based on the same inventive concept, the present application further provides a communication entity 900, as shown in FIG. 9, including a processing unit 901 and a transceiver unit 902, which can be used to perform the method performed by the terminal in any of the above embodiments. The communication entity 900 can be a terminal.

Optionally, the transceiver unit 902 is configured to receive a first message, where the first message includes a roaming policy of the terminal;

The processing unit 901 is configured to perform, according to the roaming policy, determining whether a PDU session to be established is allowed to perform local grooming, and generate a PDU session establishment request. The PDU session establishment request includes indicating whether the PDU session to be established is allowed. First indication information for local grooming;

The transceiver unit 902 is further configured to send the PDU session establishment request to the access and mobility management function AMF network element.

Optionally, the roaming policy includes a type of a PDU session that is not allowed to perform local grooming;

The processing unit 901 is specifically configured to:

Optionally, the roaming policy includes a correspondence between a type of a PDU session and a roaming identifier, where the roaming identifier is used to indicate whether a PDU session of a type corresponding to the roaming identifier is allowed to perform local grooming;

The processing unit 901 is specifically configured to:

Optionally, the PDU session to be established allows local grooming to include:

Based on the same inventive concept, the present application further provides a communication entity 1000, as shown in FIG. 10, including a processing unit 1001 and a transceiver unit 1002, which can be used to perform the method performed by the terminal in any of the above embodiments. The communication entity 1000 can be an AMF network element.

Optionally, the transceiver unit 1002 is configured to perform receiving a PDU session establishment request from a terminal, where the PDU session establishment request includes first indication information used to indicate whether a PDU session to be established is allowed to perform local grooming;

The processing unit 1001 is configured to execute, according to the first indication information, a session management request.

The transceiver unit 1002 is further configured to perform sending the session management request, where the session management request is used to request to establish the PDU session.

Optionally, when the first indication information indicates that the PDU session to be established is not allowed to perform local grooming, the session management request includes the identifier information of the SMF network element of the home location selected by the AMF network element, The session management request is for requesting to establish a PDU session for the HPLMN.

Optionally, when the first indication information indicates that the PDU session to be established allows local grooming, the session management request is used to request to establish a PDU session of the VPLMN.

Optionally, when the first indication information indicates that the PDU session to be established is allowed to perform local grooming, and the HPLMN authorization is required, the session management request includes, to indicate that the PDU session to be established needs to be performed. The HPLMN authorizes second indication information for requesting an HPLMN authorization and establishing a VPLMN PDU session.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with the present application are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center To another website, computer, server, or data center by wire (for example, coaxial cable, fiber, digital subscriber line (DSL), or wireless (such as infrared, wireless, microwave, etc.) Transfer. The computer readable storage medium can be any available media that can be stored by a computer or a data storage device such as a server, data center, or the like that includes a plurality of available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

Those skilled in the art will also appreciate that the various illustrative logical blocks and steps listed herein can be implemented by electronic hardware, computer software, or a combination of both. Whether such functionality is implemented by hardware or software depends on the design requirements of the particular application and the overall system. Those skilled in the art can implement the described functions using various methods for each particular application, but such implementation should not be construed as being beyond the scope of the present disclosure.

The various illustrative logic units and circuits described in this application may be implemented by a general purpose processor, a digital signal processor, an application specific integrated circuit (ASIC), or a field programmable gate array (English: Field-Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of the above is designed to implement or operate the described functionality. A general purpose processor may be a microprocessor. Alternatively, the general purpose processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration. achieve.

The steps of a method or algorithm described in this application can be directly embedded in hardware, a software unit executed by a processor, or a combination of the two. The software unit can be stored in a random access memory (English: Random-Access Memory, RAM for short), flash memory, read-only memory (English: Read-Only Memory, abbreviation: ROM), erasable programmable read-only register (English) : Erasable Programmable Read Only Memory (EPROM), Register, Hard Disk, Removable Disk, CD-ROM (English: Compact Disc Read-Only Memory, CD-ROM) or any other form of storage medium in the field . Illustratively, the storage medium can be coupled to the processor such that the processor can read information from the storage medium and can write information to the storage medium. Alternatively, the storage medium can also be integrated into the processor. The processor and the storage medium may be disposed in an ASIC, and the ASIC may be disposed in the terminal device or the network device. Alternatively, the processor and the storage medium may also be disposed in different components in the terminal device or the network device.

In one or more exemplary designs, the functions described above may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, these functions may be stored on a computer readable medium or transmitted in a form of one or more instructions or code on a computer readable medium. Computer readable media includes computer storage media and communication media that facilitates the transfer of computer programs from one place to another. The storage medium can be any available media that any general purpose or special computer can access. For example, such computer-readable media can include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage or other magnetic storage device, or any other device or data structure that can be used for carrying or storing Other media that can be read by a general purpose or special computer, or a general purpose or special processor. In addition, any connection can be appropriately defined as a computer readable medium, for example, if the software is from a website site, server or other remote source through a coaxial cable, fiber optic computer, twisted pair, digital subscriber line (DSL) Or wirelessly transmitted in, for example, infrared, wireless, and microwave, is also included in the defined computer readable medium. The disk and the disc include a compressed disk, a laser disk, an optical disk, a digital versatile disk (DVD), a floppy disk, and a Blu-ray disk. The disk usually replicates data magnetically. Discs are typically optically replicated with a laser. Combinations of the above may also be included in a computer readable medium.

Those skilled in the art will appreciate that in one or more examples described above, the functions described herein can be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

The specific embodiments of the present invention have been described in detail with reference to the specific embodiments of the present application. It is to be understood that the foregoing description is only The scope of protection, any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present application are included in the scope of protection of the present application. The above description of the specification of the present application may enable any of the art to utilize or implement the content of the present application. Any modification based on the disclosure should be considered as being obvious in the art. The basic principles described in the present application can be applied to other variants. Without departing from the spirit and scope of the invention. Therefore, the disclosure of the present application is not limited to the described embodiments and designs, but may be extended to the maximum extent consistent with the principles of the present application and the novel features disclosed.

Claims

A method for establishing a protocol data unit PDU session, the method comprising:

Receiving, by the terminal, a first message, where the first message includes a roaming policy of the terminal;

Determining, according to the roaming policy, whether the PDU session to be established is allowed to perform local grooming, and generating a PDU session establishment request; the PDU session establishment request includes, to indicate whether the PDU session to be established is allowed to perform local grooming An indication message;

The terminal sends the PDU session establishment request to the access and mobility management function AMF network element.
The method according to claim 1, wherein the roaming policy comprises a type of a PDU session that is not allowed to perform local grooming;

The terminal determines, according to the roaming policy, whether the PDU session to be established is allowed to perform local grooming, including:

If the type of the PDU session to be established belongs to the type of the PDU session that is not allowed to be locally groomed included in the roaming policy, the terminal determines that the PDU session to be established is not allowed to perform local grooming.
The method according to claim 1, wherein the roaming policy includes a correspondence between a type of a PDU session and a roaming identifier, and the roaming identifier is used to indicate whether a PDU session of a type corresponding to the roaming identifier is allowed to be performed. Local grooming;

The terminal determines, according to the roaming policy, whether the PDU session to be established is allowed to perform local grooming, including:

And determining, by the terminal, the roaming identifier corresponding to the type of the PDU session to be established, according to the type of the PDU session to be established and the roaming policy.
The method according to any one of claims 1 to 3, wherein the PDU session to be established allows local grooming to include:

The PDU session to be established allows for local grooming and is authorized by the home land mobile network HPLMN; or

The PDU session to be established allows for local grooming without the need for HPLMN authorization.
A method for establishing a PDU session, the method comprising:

The AMF network element receives a PDU session establishment request from the terminal, where the PDU session establishment request includes first indication information indicating whether the PDU session to be established is allowed to perform local grooming;

And generating, by the AMF network element, a session management request according to the first indication information, where the session management request is used to request to establish the PDU session.
The method of claim 5 wherein:

When the first indication information indicates that the PDU session to be established is not allowed to perform local grooming, the session management request includes identification information of the SMF network element of the home location selected by the AMF network element, and the session management Request a PDU session for requesting the establishment of an HPLMN.
The method of claim 5 wherein:

The session management request is used to request to establish a PDU session of the VPLMN when the first indication information indicates that the PDU session to be established allows local grooming.
The method of claim 7 wherein:

When the first indication information indicates that the PDU session to be established is allowed to perform local grooming, and the HPLMN authorization is required, the session management request includes, to indicate that the PDU session to be established needs to perform HPLMN authorization. Instructing information that the session management request is used to request an HPLMN authorization and establish a VPLMN PDU session.
A communication entity, characterized in that said communication entity is operative to perform the method of any one of claims 1 to 4.
A communication entity, characterized in that said communication entity is operative to perform the method of any one of claims 5 to 8.