CN115915341A

CN115915341A - PLMN selection method, device and storage medium

Info

Publication number: CN115915341A
Application number: CN202111162210.7A
Authority: CN
Inventors: 姜永; 张惠英
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2023-04-04

Abstract

The embodiment of the application provides a PLMN selection method, a device and a storage medium, wherein the method comprises the following steps: acquiring a first list sent by a first candidate relay UE; the first list comprises all PLMNs shared by the cells where the first candidate relay UE currently resides; determining a second list according to the ProSe policy information configured for the remote UE; the second list contains PLMNs authorized for ProSe direct communication that have been configured for the remote UE; a PLMN authorized for network registration is determined based on the first list and the second list. The PLMN selection method, apparatus, and storage medium provided in the embodiments of the present application respectively obtain a first list composed of all PLMNs shared by a cell where a candidate relay UE currently resides and sent by the candidate relay UE, and a second list composed of PLMNs authorized to perform ProSe direct communication configured for the remote UE, and determine a PLMN authorized for network registration of the remote UE, thereby improving efficiency of selecting a PLMN capable of providing service for the remote UE.

Description

PLMN selection method, device and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a PLMN selection method, apparatus, and storage medium.

Background

The existing protocol researches and standardizes Proximity Services (ProSe) in the fifth generation mobile communication (5 g) system, and an important scenario in ProSe is that a Remote terminal/User Equipment (UE) communicates with a Network (UE-to-Network, U2N) Relay (Relay) through the UE to obtain related Services. The Remote UE needs to discover the UE-to-Network Relay through a discovery process and then establish a connection with the UE-to-Network Relay. The ProSe UE-to-Network Relay may Relay over a layer-3 Network protocol and a layer-2 Network protocol. For the layer-2Remote UE, it needs to communicate with the layer-2Remote UE through the PC5 interface, and on the other hand, it needs to access to a Public Land Mobile Network (PLMN) through the layer-2Remote UE. How to ensure that the PLMN selected by the layer-2Remote UE can meet the above requirements is a technical problem to be solved at present.

Disclosure of Invention

The embodiment of the application provides a PLMN selection method, a PLMN selection device and a storage medium, which are used for solving the technical problem that the efficiency of selecting a proper PLMN by a Remote UE is low in the prior art.

In a first aspect, an embodiment of the present application provides a PLMN selection method, applied to a remote UE, including:

acquiring a first list sent by first candidate relay UE; the first list includes all PLMNs shared by a cell where the first candidate relay UE currently resides;

determining a second list according to the ProSe policy information configured for the remote UE; the second list includes PLMNs authorized for ProSe direct communication that have been configured for the remote UE;

determining a PLMN authorized for network registration based on the first list and the second list.

In some embodiments, determining a PLMN authorized for network registration based on the first list and the second list comprises:

determining a third list according to the ProSe policy information; the third list includes PLMNs allowed to relay that have been configured for the remote UE;

determining a PLMN in an intersection of the first list and the second list if the third list includes a first PLMN therein and the intersection of the first list and the second list is not empty; the first PLMN is a PLMN which the first candidate relay UE is currently accessed; the PLMN in the intersection is a PLMN authorized to perform network registration.

In some embodiments, further comprising: initiating a registration request to a PLMN in the intersection through the first candidate relay UE.

In some embodiments, initiating, by the first candidate relay UE, a registration request to a PLMN in the intersection includes:

determining a second PLMN of highest priority in the intersection;

initiating a registration request to the second PLMN through the first candidate relay UE.

In some embodiments, further comprising:

acquiring a registration rejection message fed back by the second PLMN;

initiating a registration request to a third PLMN through the first candidate relay UE; the third PLMN is a PLMN of lower priority in the intersection than the second PLMN.

In some embodiments, in a case that only the first PLMN is included in the aggregation and a registration rejection message fed back by the first PLMN has been acquired, the method further includes:

acquiring a fourth list sent by the second candidate relay UE; the fourth list includes all PLMNs shared by the cell where the second candidate relay UE currently resides;

determining a PLMN authorized for network registration based on the second list and the fourth list.

determining a third list according to the ProSe policy information; the third list includes PLMNs allowed for relaying that have been configured for the remote UE;

acquiring a fourth list sent by a second candidate relay UE under the condition that the third list does not contain the first PLMN, or the third list contains the first PLMN and the intersection of the first list and the second list is empty; the first PLMN is a PLMN which the first candidate relay UE is currently accessed to; the fourth list includes all PLMNs shared by a cell where the second candidate relay UE currently resides;

In some embodiments, further comprising:

acquiring the ProSe strategy information; the second list and the third list are included in the ProSe policy information.

In a second aspect, an embodiment of the present application provides a PLMN selection method, applied to a relay UE, including:

sending the first list to the remote UE; the first list includes all PLMNs shared by a cell where the relay UE currently resides; the first list is used to determine PLMNs that the remote UE is authorized to register with.

In some embodiments, further comprising:

receiving a registration request message sent by the remote UE under the condition that a third list contains a first PLMN and the intersection of the first list and the second list is not empty; the third list includes PLMNs allowed to relay configured for the remote UE; the second list includes PLMNs authorized for ProSe direct communication configured for the remote UE; the first PLMN is a PLMN to which the relay UE is currently accessed; the registration request message comprises a target PLMN; the target PLMN is a PLMN in an intersection of the first list and the second list;

and initiating a registration request to the target PLMN.

In a third aspect, an embodiment of the present application provides a remote UE, including a memory, a transceiver, and a processor;

a memory for storing a computer program; a transceiver for transceiving data under the control of the processor; a processor for reading the computer program in the memory and performing the following operations:

acquiring a first list sent by a first candidate relay UE; the first list includes all PLMNs shared by a cell where the first candidate relay UE currently resides;

determining a PLMN in an intersection of the first list and the second list if the third list includes a first PLMN therein and the intersection of the first list and the second list is not empty; the first PLMN is a PLMN which the first candidate relay UE is currently accessed to; the PLMN in the intersection is a PLMN authorized to perform network registration.

determining a second PLMN of highest priority in the intersection;

In some embodiments, further comprising:

acquiring a registration rejection message fed back by the second PLMN;

In some embodiments, in a case where only the first PLMN is included in the aggregation and a registration rejection message fed back by the first PLMN has been acquired, the method further includes:

acquiring a fourth list sent by a second candidate relay UE under the condition that the third list does not contain the first PLMN, or the third list contains the first PLMN and the intersection of the first list and the second list is empty; the first PLMN is a PLMN which the first candidate relay UE is currently accessed to; the fourth list includes all PLMNs shared by the cell where the second candidate relay UE currently resides;

In some embodiments, further comprising:

In a fourth aspect, an embodiment of the present application provides a relay UE, including a memory, a transceiver, and a processor;

a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

In some embodiments, further comprising:

and initiating a registration request to the target PLMN.

In a fifth aspect, an embodiment of the present application provides a PLMN selecting apparatus, including:

an obtaining module, configured to obtain a first list sent by a first candidate relay UE; the first list includes all PLMNs shared by a cell where the first candidate relay UE currently resides;

a first determining module, configured to determine a second list according to ProSe policy information configured for the remote UE; the second list contains PLMNs authorized for ProSe direct communication that have been configured for remote UEs;

a second determination module to determine a PLMN authorized for network registration based on the first list and the second list.

In a sixth aspect, an embodiment of the present application provides a PLMN selecting apparatus, including:

a sending module, configured to send the first list to a remote UE; the first list includes all PLMNs shared by a cell where the relay UE currently resides; the first list is used to determine PLMNs that the remote UE is authorized to register with.

In a seventh aspect, this application embodiment further provides a processor-readable storage medium, which stores a computer program for causing the processor to execute the steps of the PLMN selection method according to the first aspect or the second aspect.

The PLMN selection method, apparatus, and storage medium provided in the embodiments of the present application respectively obtain a first list composed of all PLMNs shared by a cell where the candidate relay UE currently resides and sent by the candidate relay UE, and a second list composed of PLMNs authorized to perform ProSe direct communication configured for the remote UE, and determine a PLMN authorized for network registration by the remote UE, thereby improving efficiency of selecting a PLMN capable of providing a service for the remote UE by the remote UE.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a flowchart illustrating a PLMN selection method according to an embodiment of the present application;

fig. 2 is a signaling interaction flowchart provided in an embodiment of the present application;

fig. 3 is a second signaling interaction flowchart provided in the embodiment of the present application;

fig. 4 is a third flowchart of signaling interaction provided in the embodiment of the present application;

fig. 5 is a fourth flowchart of signaling interaction provided in the embodiment of the present application;

fig. 6 is a second flowchart of a PLMN selection method according to the embodiment of the present application;

fig. 7 is a schematic structural diagram of a remote UE according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a relay UE according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a PLMN selection apparatus according to an embodiment of the present application;

fig. 10 is a second schematic structural diagram of a PLMN selection apparatus according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 is a flowchart illustrating a PLMN selection method according to an embodiment of the present disclosure, and as shown in fig. 1, an execution subject of the PLMN selection method may be a Remote UE, such as a mobile phone. The method can be applied to architectures such as 5G ProSe Layer-2 UE-to-Network Relay and the like. The method comprises the following steps:

step 101, acquiring a first list sent by a first candidate relay UE; the first list includes all PLMNs shared by a cell in which the first candidate relay UE currently resides.

Specifically, fig. 2 is one of signaling interaction flowcharts provided in the embodiment of the present application, and as shown in fig. 2, in the embodiment of the present application, when a Remote UE is in offline operation, the Remote UE performs a Direct Discovery (Direct Discovery) process, and the Remote UE and the Relay UE discover each other through an unlicensed frequency band and a Mode (Mode) a and a Mode B.

ProSe Direct Link (ProSe Direct Link Establishment) is established between Remote UE and Relay UE.

The Remote UE and the Relay UE transmit data through an established PC5 direct communication (direct communication) link. And the PC5 is a direct interface between the Remote UE and the Relay UE.

The Relay UE sends the first list to the Remote UE via an established PC5 direct communication link. The first list contains all PLMNs shared by the cell where the Relay UE currently resides. For example, the first list includes a plurality of Identifiers (IDs), and each ID corresponds to a PLMN shared by a cell where the Relay UE currently resides.

All PLMNs shared by the cell where the Relay UE currently resides include a PLMN currently accessed by the Relay UE, that is, a PLMN currently serving the Relay UE, and other PLMNs shared by the cell where the Relay UE currently resides.

The Remote UE receives the first list sent by the Relay UE.

After receiving the first list sent by the Relay UE, the Remote UE takes the PLMN in the first list as a candidate PLMN.

Step 102, determining a second list according to the ProSe strategy information configured for the remote UE; the second list includes PLMNs that have been configured for the remote UE that are authorized for ProSe direct communication.

In some embodiments, further comprising:

Specifically, in this embodiment of the present application, the ProSe policy information is configured by the network side, the network side sends the ProSe policy information to the Remote UE, and the Remote UE receives the ProSe policy information sent by the network side.

And after receiving the ProSe strategy information sent by the network side, the Remote UE determines a second list and a third list according to the ProSe strategy information. The ProSe policy information includes a second list and a third list.

The second list contains PLMNs authorized for ProSe direct communication that have been configured for Remote UEs.

The third list contains the relay-allowed PLMNs that have been configured for the Remote UE.

The ProSe strategy information is configured on the network side, so that the Remote UE can determine the second list and the third list, and the flexibility of the system is improved.

It should be noted that: the ProSe policy information may also be preconfigured information, i.e., information agreed by a protocol, and the configuration on the network side is not required, in which case, the efficiency can be improved and the resource overhead can be reduced.

And 103, determining the PLMN authorized to perform network registration based on the first list and the second list.

Specifically, in this embodiment of the present application, the Remote UE acquires a first list sent by the Relay UE, determines a second list according to the ProSe policy information, and then determines, based on the first list and the second list, a PLMN authorized for network registration.

Specifically, in this embodiment of the present application, after the Remote UE acquires the first list sent by the Relay UE and determines the second list according to the ProSe policy information, a third list needs to be determined according to the ProSe policy information, where the third list includes PLMNs that are allowed to be relayed and are configured for the Remote UE.

After the Remote UE determines the third list according to the ProSe policy information, it determines whether the PLMN currently accessed by the Relay UE is included in the third list, and determines whether the intersection of the first list and the second list is empty.

In some embodiments, fig. 3 is a second signaling interaction flowchart provided in this embodiment, as shown in fig. 3, when a third list includes a first PLMN and an intersection of the first list and the second list is not empty, the Remote UE determines a PLMN in the intersection of the first list and the second list, where the PLMN in the intersection is a PLMN authorized for network registration, and a current Relay UE is also a UE that meets a condition and can serve as a Relay.

According to the PLMN selection method provided by the embodiment of the application, the first list formed by all PLMNs shared by the cell where the relay UE resides currently and sent by the candidate relay UE and the second list formed by the PLMNs which are configured for the remote UE and authorized to carry out ProSe direct communication are obtained respectively, the PLMN which is authorized to carry out network registration of the remote UE is determined, and the efficiency of the remote UE in selecting the PLMN which can provide service for the remote UE is improved.

In some embodiments, further comprising: initiating a registration request to a PLMN in the handover through the first candidate relay UE.

Specifically, in the embodiment of the present application, after the Remote UE determines the PLMN authorized to perform network registration in the intersection and the current Relay UE meeting the condition, the current Relay UE initiates a registration request to the PLMN authorized to perform network registration in the intersection.

Namely, the Request UE sends a Registration Request (Registration Request) message to the Relay UE, the Registration Request message includes an identifier of a PLMN desired to be accessed selected by the Request UE, and after receiving the Registration Request message sent by the Request UE, the Relay UE sends the Registration Request message to an Access and Mobility Management Function (AMF) network element in the PLMN desired to be accessed selected by the Request UE through a base station (NG-RAN).

And under the condition that the Registration of the Remote UE is successful, the AMF network element feeds back a Registration Accept (Registration Accept) message to the Remote UE. And feeding back the authorized ProSe information and the PC5 communication parameter information to the Remote UE.

The authorized ProSe information includes the capabilities/functions for which the Remote UE is authorized. For example, whether it is authorized to use 5G ProSe Direct Discovery function, whether it is authorized to use 5 GPRoseSe Direct Communication function, whether it is authorized as 5G ProSe Layer-2U2N Relay, whether it is authorized as 5G ProSe Layer-3 U2N Relay, whether it is authorized as 5G ProSe Layer-2Remote UE, etc.

The PC5 communication parameter information includes parameters for the Remote UE to communicate to the Relay UE. For example, a frequency band authorized for use, an Aggregated Maximum Bit Rate (AMBR), and the like.

The PLMN selection method provided in the embodiment of the present application obtains a first list, which is sent by the candidate relay UE and is shared by all PLMNs currently camped on the cell, and a second list, which is configured for the remote UE and is composed of PLMNs authorized to perform ProSe direct communication, determines the PLMN authorized for network registration of the remote UE, and initiates a registration request to the PLMN authorized for network registration, thereby improving a success rate of network registration.

determining a second PLMN of highest priority in the intersection;

Specifically, in this embodiment of the present application, in a case that there are multiple PLMNs in an intersection of the first list and the second list, the Remote UE selects according to the priority of the PLMNs, and preferentially selects a PLMN with the highest priority to initiate a registration request.

It should be noted that: in the case that there are multiple PLMNs in the intersection of the first list and the second list, the Remote UE may also randomly select one of the PLMNs to initiate the registration request.

According to the PLMN selection method provided by the embodiment of the application, the PLMN with the highest priority is preferentially selected to initiate the registration request, so that the success rate of network registration is further improved.

In some embodiments, further comprising:

acquiring a registration rejection message fed back by the second PLMN;

Specifically, fig. 4 is a third signaling interaction flowchart provided in the embodiment of the present application, as shown in fig. 4, in the embodiment of the present application, when multiple PLMNs exist in an intersection between a first list and a second list, a Remote UE selects according to priorities of the PLMNs, selects a PLMN with a highest priority to initiate a registration request, and then selects another PLMN with a lower priority to reinitiate the registration request according to the priority of the PLMN if the registration fails.

According to the PLMN selection method provided by the embodiment of the application, under the condition that the PLMN with the highest priority fails to initiate the registration request, other PLMNs with lower priorities are selected to initiate the registration request again, and the success rate of network registration is further improved.

acquiring a fourth list sent by a second candidate relay UE; the fourth list includes all PLMNs shared by the cell where the second candidate relay UE currently resides;

Specifically, fig. 5 is a fourth signaling interaction flowchart provided in the embodiment of the present application, and as shown in fig. 5, in the embodiment of the present application, an intersection of the first list and the second list only includes a PLMN currently accessed by a Relay UE, and when registration has failed, the Relay UE re-executes a Direct Discovery process, and the Relay UE and a new Relay UE discover each other through Mode a and Mode B through an unlicensed frequency band.

And establishing a ProSe direct link between the Remote UE and the new Relay UE.

And the new Relay UE sends a fourth list to the Relay UE, wherein the fourth list contains all PLMNs shared by the cells where the new Relay UE currently resides.

The Remote UE receives the fourth list sent by the new Relay UE.

The Remote UE re-determines PLMNs authorized for network registration based on the second list and the fourth list.

According to the PLMN selection method provided by the embodiment of the application, under the condition that the current Relay UE cannot be successfully registered, the new Relay UE is selected to re-determine the PLMN authorized for network registration, and the reliability of the system is ensured.

Specifically, in this embodiment of the present application, when the third list does not include the first PLMN, it indicates that the PLMN accessed by the current Relay UE does not support the Relay function, and at this time, the Remote UE needs to select a new Relay UE to re-determine the PLMN authorized for network registration.

In addition, when the third list includes the first PLMN and the intersection of the first list and the second list is empty, it indicates that all PLMNs shared by the cell where the current Relay UE currently resides are not suitable for registration by the Relay UE, and at this time, the Relay UE also needs to select a new Relay UE to re-determine the PLMN authorized for network registration.

Under the two conditions, the Remote UE needs to re-execute the Direct Discovery process, and the Remote UE and the new Relay UE discover each other through the Mode a and the Mode B through the unlicensed frequency band.

The Remote UE receives the fourth list sent by the new Relay UE.

Fig. 6 is a second flowchart of the PLMN selection method according to the embodiment of the present application, and as shown in fig. 6, the embodiment of the present application provides a PLMN selection method, where an execution subject of the PLMN selection method may be a relay UE, such as a mobile phone. The method comprises the following steps:

step 601, sending a first list to a remote UE; the first list includes all PLMNs shared by a cell where the relay UE currently resides; the first list is used to determine PLMNs that the remote UE is authorized to register with.

In some embodiments, further comprising:

and initiating a registration request to the target PLMN.

Specifically, the PLMN selection method provided in the embodiment of the present application may refer to the PLMN selection method embodiment in which the execution subject is the remote UE, and may achieve the same technical effect, and details of the same parts and beneficial effects as those of the corresponding method embodiment in this embodiment are not repeated herein.

Fig. 7 is a schematic structural diagram of a remote UE according to an embodiment of the present application, and as shown in fig. 7, the remote UE includes a memory 720, a transceiver 700, and a processor 710, where:

a memory 720 for storing a computer program; a transceiver 700 for transceiving data under the control of the processor 710; a processor 710 for reading the computer program in the memory 720 and performing the following operations:

determining a second list according to the ProSe policy information configured for the remote UE; the second list includes PLMNs authorized for ProSe direct communication that have been configured for remote UEs;

In particular, transceiver 700 is used to receive and transmit data under the control of processor 710.

Wherein in fig. 7, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 710, and various circuits, represented by memory 720, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 700 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over transmission media including wireless channels, wired channels, fiber optic cables, and the like. For different user devices, the user interface 730 may also be an interface capable of interfacing externally to a desired device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 710 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 710 in performing operations.

In some embodiments, the processor 710 may be a CPU (central processing unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a CPLD (Complex Programmable Logic Device), and may also adopt a multi-core architecture.

The processor is used for executing any one of the methods provided by the embodiment of the application according to the obtained executable instructions by calling the computer program stored in the memory. The processor and memory may also be physically separated.

determining a second PLMN of highest priority in the intersection;

In some embodiments, further comprising:

acquiring a registration rejection message fed back by the second PLMN;

In some embodiments, further comprising:

It should be noted that, the remote UE provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution subject is the remote UE, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in this embodiment are omitted here.

Fig. 8 is a schematic structural diagram of a relay UE according to an embodiment of the present application, and as shown in fig. 8, the relay UE includes a memory 820, a transceiver 800, and a processor 810, where:

a memory 820 for storing a computer program; a transceiver 800 for transceiving data under the control of the processor 810; a processor 810 for reading the computer program in the memory 820 and performing the following operations:

In particular, transceiver 800 is used to receive and transmit data under the control of processor 810.

Where in fig. 8, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 810, and various circuits, represented by memory 820, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 800 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, and the like. The user interface 830 may also be an interface capable of interfacing externally to a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 810 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 810 in performing operations.

In some embodiments, the processor 810 may be a CPU (central processing unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a CPLD (Complex Programmable Logic Device), and the processor may also adopt a multi-core architecture.

In some embodiments, further comprising:

and initiating a registration request to the target PLMN.

It should be noted that, the relay UE provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution main body is the relay UE, and can achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.

Fig. 9 is a schematic structural diagram of a PLMN selection apparatus provided in an embodiment of the present application, and as shown in fig. 9, the embodiment of the present application provides a PLMN selection apparatus, including an obtaining module 901, a first determining module 902, and a second determining module 903, where:

the obtaining module 901 is configured to obtain a first list sent by a first candidate relay UE; the first list includes all PLMNs shared by a cell where the first candidate relay UE currently resides; the first determining module 902 is configured to determine the second list according to ProSe policy information already configured for the remote UE; the second list includes PLMNs authorized for ProSe direct communication that have been configured for remote UEs; a second determination module 903 is configured to determine PLMNs authorized for network registration based on the first list and the second list.

In some embodiments, the second determination module comprises a first determination submodule and a second determination submodule;

the first determining submodule is used for determining a third list according to the ProSe strategy information; the third list includes PLMNs allowed for relaying that have been configured for the remote UE;

the second determination submodule is configured to determine a PLMN in an intersection of the first list and the second list if the third list includes the first PLMN and an intersection of the first list and the second list is not empty; the first PLMN is a PLMN which the first candidate relay UE is currently accessed to; the PLMN in the intersection is a PLMN authorized to perform network registration.

In some embodiments, a first registration module is also included;

the first registration module is configured to initiate a registration request to a PLMN in the intersection through the first candidate relay UE.

In some embodiments, the first registration module includes a third determination submodule and a first registration submodule;

the third determining submodule is used for determining a second PLMN with the highest priority in the intersection;

the first registration submodule is configured to initiate a registration request to the second PLMN through the first candidate relay UE.

In some embodiments, the system further comprises a first acquisition module and a second registration module;

the first obtaining module is configured to obtain a registration rejection message fed back by the second PLMN;

the second registration module is configured to initiate a registration request to a third PLMN through the first candidate relay UE; the third PLMN is a PLMN of lower priority in the intersection than the second PLMN.

In some embodiments, in a case that only the first PLMN is included in the intersection and a registration rejection message fed back by the first PLMN has been acquired, a third acquiring module and a fourth determining module are further included;

the third obtaining module is configured to obtain a fourth list sent by a second candidate relay UE; the fourth list includes all PLMNs shared by the cell where the second candidate relay UE currently resides;

the fourth determining module is configured to determine a PLMN authorized for network registration based on the second list and the fourth list.

In some embodiments, the second determination module comprises a fourth determination submodule, a first acquisition submodule, and a fifth determination submodule;

the fourth determining submodule is used for determining a third list according to the ProSe strategy information; the third list includes PLMNs allowed to relay that have been configured for the remote UE;

the first obtaining sub-module is configured to obtain a fourth list sent by a second candidate relay UE, when the third list does not include the first PLMN, or when the third list includes the first PLMN and an intersection of the first list and the second list is empty; the first PLMN is a PLMN which the first candidate relay UE is currently accessed to; the fourth list includes all PLMNs shared by the cell where the second candidate relay UE currently resides;

the fifth determining sub-module is configured to determine PLMNs authorized for network registration based on the second list and the fourth list.

In some embodiments, the method further comprises:

the second obtaining module is configured to obtain the ProSe policy information; the second list and the third list are included in the ProSe policy information.

Specifically, the PLMN selection apparatus provided in the embodiment of the present application may implement all the method steps implemented by the method embodiment in which the execution subject is the remote UE, and may achieve the same technical effects, and details of the same parts and beneficial effects as in the method embodiment in this embodiment are not repeated herein.

Fig. 10 is a second schematic structural diagram of a PLMN selection apparatus according to an embodiment of the present invention, and as shown in fig. 10, the PLMN selection apparatus according to the embodiment of the present invention includes a sending module 1001.

A sending module 1001 is configured to send a first list to a remote UE; the first list includes all PLMNs shared by the cell where the relay UE currently resides; the first list is used to determine PLMNs that the remote UE is authorized to register with.

In some embodiments, the system further comprises a receiving module and a first sending module;

the receiving module is configured to receive a registration request message sent by the remote UE when a third list includes a first PLMN and an intersection of the first list and a second list is not empty; the third list includes PLMNs allowed to relay configured for the remote UE; the second list includes PLMNs authorized for ProSe direct communication configured for the remote UE; the first PLMN is a PLMN to which the relay UE is currently accessed; the registration request message comprises a target PLMN; the target PLMN is a PLMN in an intersection of the first list and the second list;

the first sending module is configured to initiate a registration request to the target PLMN.

Specifically, the PLMN selection apparatus provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution subject is the relay UE, and can achieve the same technical effects, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not described herein again.

It should be noted that, in the foregoing embodiments of the present application, the division of the units/modules is schematic, and is only a logic function division, and another division manner may be used in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

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

In some embodiments, there is also provided a processor-readable storage medium storing a computer program for causing a processor to perform the method provided by the above embodiments, including:

acquiring a first list sent by a first candidate relay UE; the first list includes all PLMNs shared by a cell where the first candidate relay UE currently resides; determining a second list according to the ProSe policy information configured for the remote UE; the second list contains PLMNs authorized for ProSe direct communication that have been configured for remote UEs; determining a PLMN authorized for network registration based on the first list and the second list.

Or comprises the following steps:

It should be noted that: the processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), solid State Disks (SSDs)), etc.

In addition, it should be noted that: the terms "first," "second," and the like in the embodiments of the present application are used for distinguishing between similar elements and not for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in other sequences than those illustrated or otherwise described herein, and that the terms "first" and "second" used herein generally refer to a class and do not limit the number of objects, for example, a first object can be one or more.

In the embodiment of the present application, the term "and/or" describes an association relationship of associated objects, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.

The technical scheme provided by the embodiment of the application can be suitable for various systems, particularly 5G systems. For example, suitable systems may be global system for mobile communications (GSM) systems, code Division Multiple Access (CDMA) systems, wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) systems, long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, long term evolution (long term evolution) systems, LTE-a systems, universal mobile systems (universal mobile telecommunications systems, UMTS), universal internet Access (world interoperability for microwave Access (WiMAX) systems, new Radio interface (NR) systems, etc. These various systems include terminal devices and network devices. The System may further include a core network portion, such as an Evolved Packet System (EPS), a 5G System (5 GS), and the like.

The terminal device referred to in the embodiments of the present application may refer to a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or another processing device connected to a wireless modem. In different systems, the names of the terminal devices may be different, for example, in a 5G system, the terminal device may be referred to as a User Equipment (UE). A wireless terminal device, which may be a mobile terminal device such as a mobile phone (or called a "cellular" phone) and a computer having a mobile terminal device, for example, a portable, pocket, hand-held, computer-included or vehicle-mounted mobile device, may communicate with one or more Core Networks (CNs) via a Radio Access Network (RAN), and may exchange languages and/or data with the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, session Initiation Protocol (SIP) phones, wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). The wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile station), a remote station (remote station), an access point (access point), a remote terminal (remote terminal), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), and a user device (user device), which is not limited in this embodiment.

The network device according to the embodiment of the present application may be a base station, and the base station may include a plurality of cells for providing services to a terminal. A base station may also be referred to as an access point, or a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or by other names, depending on the particular application. The network device may be configured to exchange received air frames with Internet Protocol (IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) or a Code Division Multiple Access (CDMA), a network device (NodeB) in a Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB) or an e-NodeB) in a Long Term Evolution (LTE) System, a 5G Base Station (gNB) in a 5G network architecture (next generation System), a Home evolved Node B (HeNB), a relay Node (relay Node), a Home Base Station (femto), a pico Base Station (pico), and the like, which are not limited in the embodiments of the present application. In some network architectures, a network device may include a Centralized Unit (CU) node and a Distributed Unit (DU) node, which may also be geographically separated.

Multiple Input Multiple Output (MIMO) transmission may be performed between the network device and the terminal device by using one or more antennas, where the MIMO transmission may be Single User MIMO (SU-MIMO) or Multi-User MIMO (MU-MIMO). According to the form and the number of the root antenna combination, the MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO or massive-MIMO, and can also be diversity transmission, precoding transmission, beamforming transmission, etc.

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

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A public land mobile network PLMN selection method, applied to a remote terminal UE, comprises:

determining a second list according to proximity services (ProSe) policy information configured for the remote UE; the second list includes PLMNs authorized for ProSe direct communication that have been configured for the remote UE;

2. The PLMN selection method of claim 1, wherein determining a PLMN authorized for network registration based on the first list and the second list comprises:

determining a PLMN in an intersection of the first list and the second list if the first PLMN is included in the third list and the intersection of the first list and the second list is not empty; the first PLMN is a PLMN which the first candidate relay UE is currently accessed to; the PLMN in the intersection is a PLMN authorized to perform network registration.

3. The PLMN selection method of claim 2, further comprising: initiating a registration request to a PLMN in the intersection through the first candidate relay UE.

4. The PLMN selection method of claim 3, wherein initiating, by the first candidate relay UE, a registration request to a PLMN in the aggregation comprises:

determining a second PLMN of highest priority in the intersection;

5. The PLMN selection method of claim 4, further comprising:

acquiring a registration rejection message fed back by the second PLMN;

6. The PLMN selection method according to claim 3, wherein in a case where only the first PLMN is included in the aggregation and a registration rejection message fed back by the first PLMN has been acquired, the method further comprises:

acquiring a fourth list sent by a second candidate relay UE; the fourth list includes all PLMNs shared by a cell where the second candidate relay UE currently resides;

7. The PLMN selection method of claim 1, wherein determining a PLMN authorized for network registration based on the first list and the second list comprises:

8. The PLMN selection method according to claim 2 or 7, further comprising:

9. A Public Land Mobile Network (PLMN) selection method is applied to a relay terminal (UE), and comprises the following steps:

10. The PLMN selection method of claim 9, further comprising:

receiving a registration request message sent by the remote UE under the condition that a third list contains a first PLMN and the intersection of the first list and the second list is not empty; the third list includes PLMNs allowed to relay configured for the remote UE; the second list includes PLMNs authorized for ProSe direct communication proximity services configured for the remote UE; the first PLMN is a PLMN to which the relay UE is currently accessed; the registration request message comprises a target PLMN; the target PLMN is a PLMN in an intersection of the first list and the second list;

and initiating a registration request to the target PLMN.

11. A remote terminal (UE) comprising a memory, a transceiver, a processor;

12. The remote UE of claim 11, wherein determining a PLMN authorized for network registration based on the first list and the second list comprises:

13. The remote UE of claim 12, further comprising: initiating a registration request to a PLMN in the intersection through the first candidate relay UE.

14. The remote UE of claim 13, wherein initiating a registration request to a PLMN in the intersection via the first candidate relay UE comprises:

determining a second PLMN of highest priority in the intersection;

15. The remote UE of claim 14, further comprising:

acquiring a registration rejection message fed back by the second PLMN;

16. The remote UE of claim 13, wherein in a case that only the first PLMN is included in the intersection and a registration rejection message fed back by the first PLMN has been acquired, further comprising:

17. The remote UE of claim 11, wherein determining a PLMN authorized for network registration based on the first list and the second list comprises:

18. The remote UE of claim 12 or 17, further comprising:

acquiring the ProSe strategy information; the ProSe policy information includes the second list and the third list.

19. A relay terminal (UE) is characterized by comprising a memory, a transceiver and a processor;

20. The relay UE of claim 19, further comprising:

and initiating a registration request to the target PLMN.

21. A public land mobile network PLMN selection apparatus, comprising:

the relay node comprises an acquisition module, a transmission module and a processing module, wherein the acquisition module is used for acquiring a first list sent by a first candidate relay terminal UE; the first list includes all PLMNs shared by a cell where the first candidate relay UE currently resides;

a first determining module, configured to determine a second list according to ProSe policy information already configured for the remote UE; the second list includes PLMNs authorized for ProSe direct communication that have been configured for remote UEs;

22. A public land mobile network, PLMN, selection apparatus, comprising:

a sending module, configured to send a first list to a remote terminal UE; the first list includes all PLMNs shared by a cell where the relay UE currently resides; the first list is used to determine PLMNs that the remote UE is authorized to register with.

23. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing the processor to perform the PLMN selection method according to any one of claims 1 to 10.