WO2021163974A1

WO2021163974A1 - Communication method and apparatus

Info

Publication number: WO2021163974A1
Application number: PCT/CN2020/076075
Authority: WO
Inventors: 许胜锋; 杨艳梅; 李濛
Original assignee: 华为技术有限公司
Priority date: 2020-02-20
Filing date: 2020-02-20
Publication date: 2021-08-26

Abstract

Provided are a communication method and apparatus, which relate to the technical field of communications, and can enable a terminal to acquire a discovery parameter in a device-to-device (D2D) discovery process when multiple management and control network elements are deployed in each PLMN. The solution involves: a first management and control network element assigning a PDUID to a first terminal; the first management and control network element sending first information to a first storage network element, wherein the first information comprises the PDUID of the first terminal and an identifier of the first management and control network element, the first information is used for the first storage network element to store the correlation between the PDUID of the first terminal and the identifier of the first management and control network element, the first management and control network element stores a discovery parameter of the first terminal, and the discovery parameter is used for D2D discovery. The embodiments of the present application are used for D2D discovery.

Description

Communication method and device

Technical field

The embodiments of the present application relate to the field of communication technologies, and in particular, to a communication method and device.

Background technique

With the rapid development of mobile communications, new types of services such as video chat, virtual reality (VR), or augmented reality (AR) and other data services are widely used, increasing users' demand for bandwidth. Device-to-device (D2D) communication allows direct communication between terminals, and can share spectrum resources with cell users under the control of the cell network, effectively improving the utilization of spectrum resources.

When two terminals need to perform D2D communication, the two terminals may first obtain discovery parameters, and perform a D2D discovery process based on the obtained discovery parameters; then, a D2D communication link is established between the two terminals to perform D2D communication.

In the 4th generation mobile communication technology (4G) network, each public land mobile network (PLMN) has a proximity service function (Proximity Sevice Function, ProSe Function) network element . For example, the ProSe function network element 1 in the PLMN1 where the publishing terminal is located allocates discovery parameters for the publishing terminal. During the D2D discovery process, the publishing terminal can obtain the discovery parameters of the publishing terminal from the ProSe Function network element 1. The monitoring terminal can obtain the discovery parameter of the publishing terminal from the ProSe Function network element 1 in the PLMN1 where the publishing terminal to be monitored is located through the ProSe Function network element 2. The publishing terminal and the listening terminal may execute the subsequent D2D discovery process based on the acquired discovery parameters.

In the 5th generation mobile networks (5G) network, the management and control network elements implement the distribution and storage of discovery parameters. Under normal circumstances, a PLMN is deployed with multiple management and control network elements. For example, the PLMN 1 where the publishing terminal is located includes multiple management and control network elements. How does the monitoring terminal obtain the discovery parameters of the publishing terminal to be monitored through the corresponding management and control network element 2. An important issue that needs to be resolved.

Summary of the invention

The embodiments of the present application provide a communication method and device, which can allow the terminal to obtain the discovery parameters in the D2D discovery process when multiple D2D management and control network elements are deployed in each PLMN.

In order to achieve the foregoing objectives, the following technical solutions are adopted in the embodiments of this application:

On the one hand, an embodiment of the present application provides a communication method, which can be applied to a first management and control network element. The method includes: the first management and control network element allocates a proximity service discovery user equipment identity (ProSe Discovery User Equipment Identity, ProSe Discovery UE ID, PDUID) to the first terminal. The first management and control network element sends first information to the first storage network element, the first information includes the PDUID of the first terminal and the identification of the first management and control network element, and the first information is used by the first storage network element to store the first terminal Correspondence between the PDUID and the identity of the first management and control network element. Wherein, the first management and control network element stores the discovery parameter of the first terminal, and the discovery parameter is used for D2D discovery.

In this solution, the first management and control network element corresponding to the first terminal may register the correspondence between the PDUID of the first terminal and the identification of the first management and control network element in the first storage network after allocating the PDUID of the first terminal. Yuan Shang. Therefore, in the case that each PLMN includes multiple management and control network elements, the first storage network element can provide the second management and control network element corresponding to the second terminal with the information included in the PLMN where the first terminal is located according to the PDUID of the first terminal. Among the plurality of management and control network elements, the identification of the first management and control network element that stores the discovery parameter of the first terminal. In this way, the second management and control network element can obtain the discovery parameter of the first terminal from the first management and control network element. Therefore, this solution can solve the problem that the second management and control network element does not know which management and control network element in the PLMN where the first terminal is located to obtain the discovery parameters of the first terminal, and the second management and control network element cannot obtain the discovery parameters of the first terminal.

For example, the first management and control network element may be a policy control function network element or a newly added network element.

For example, the first storage network element may be a unified data management network element, a unified data storage library network element, a binding support function network element, or a newly added network element.

For example, the discovery parameters include ProSe Restricted Code; or, the discovery parameters include ProSe Query Filter and ProSe Response Code.

In a possible design, before the first management and control network element sends the first information to the first storage network element, the method may further include: the first management and control network element sends an authorization request message to the server of the first application, the authorization request The message is used to request authorization of the first terminal to perform D2D discovery for the first application. The first management and control network element receives an authorization response message from the server, where the authorization response message is used to indicate that the first terminal is successfully authorized to perform D2D discovery for the first application.

In this solution, after determining that the server of the first application has successfully authorized the first terminal to perform D2D discovery for the first application, the first management and control network element registers the PDUID of the first terminal and the first management and control network element with the first storage network element. The corresponding relationship between the identities; this can avoid problems such as signaling overhead and storage resource overhead caused by pre-registering the corresponding relationship when the first terminal fails to obtain the discovery parameter when the server authorization of the first application fails.

In another possible design, before the first management and control network element sends the first information to the first storage network element, the method further includes: the first management and control network element receives a discovery request message from the first terminal, and the discovery request message Used to request D2D discovery.

In this solution, the first management and control network element determines that it has received the discovery request message sent by the first terminal and the corresponding relationship will be used later, and then registers the PDUID of the first terminal and the first storage network element with the first storage network element. Manages the correspondence relationship between the identities of the network elements; this can avoid the case where the first terminal has not sent a discovery request message, and the first terminal does not obtain the discovery parameters, but registers the correspondence relationship in advance to cause the signaling overhead and storage Resources and other issues.

In another possible design, the discovery request message includes the Restricted ProSe Application User ID (RPAUID) of the first terminal for the first application, and the first management and control network element sends it to the first storage network element. Before sending the first message. The method further includes: the first management and control network element allocates discovery parameters according to the discovery request message, and the discovery parameters correspond to the RPAUID.

In this solution, after receiving the discovery request message and assigning discovery parameters, the first management and control network element registers the correspondence between the PDUID of the first terminal and the identity of the first management and control network element with the first storage network element; This can avoid problems such as signaling overhead and storage resource overhead caused by the first terminal not acquiring the discovery parameter but registering the corresponding relationship in advance when the discovery parameter of the first terminal is not allocated by the first management and control network element.

In another possible design, before the first management and control network element sends the first information to the first storage network element, the method further includes: the first management and control network element sends a discovery response message to the first terminal, and the discovery response message includes Found parameters.

In this solution, after receiving the discovery request message and sending the discovery response message to the first terminal, the first management and control network element registers the difference between the PDUID of the first terminal and the identity of the first management and control network element with the first storage network element. Correspondence relationship; in this way, when the first terminal does not obtain the discovery parameter, the signaling overhead and storage resource overhead caused by the correspondence relationship can be registered in advance.

In another possible design, the method further includes: when the validity period of the PDUID of the first terminal expires, the first management and control network element sends a first deletion request message to the first storage network element, and the first deletion request message is used for For requesting to delete the correspondence between the PDUID of the first terminal and the identifier of the first management and control network element.

In this solution, the first management and control network element may request the first storage network element to delete the correspondence between the PDUID of the first terminal and the identity of the first management and control network element after the validity period of the PDUID of the first terminal expires. Wherein, the first management and control network element allocates the validity period of the PDUID, or the first management and control network element receives the first indication information, and the first indication information is used to indicate the validity period of the PDUID.

In another possible design, the first information further includes first indication information, and the first indication information is used to indicate the validity period of the PDUID of the first terminal.

In this solution, the first information sent by the first management and control network element to the first storage network element includes first indication information for indicating the validity period of the PDUID of the first terminal, so as to instruct the first storage network element to follow the first indication Information, after the validity period of the PDUID of the first terminal expires, delete the correspondence between the PDUID of the first terminal and the identity of the first management and control network element.

On the other hand, the embodiment of the present application provides a communication method, which can be applied to the second management and control network element. The method includes: the second management and control network element receives the target proximity discovery user equipment identification PDUID of the second terminal from the server of the first application, and the target PDUID includes the PDUID of the first terminal. The second management and control network element sends a first message to the first storage network element according to the PDUID of the first terminal, and the first message includes the PDUID of the first terminal. Wherein, the first message is used to obtain the identifier of the management and control network element that stores the discovery parameter of the first terminal. The second management and control network element receives the identifier of the first management and control network element from the first storage network element, and the first management and control network element stores the discovery parameter of the first terminal.

In this solution, when each PLMN includes multiple management and control network elements, the second management and control network element corresponding to the second terminal can query the first storage network element for the PLMN where the first terminal is located according to the PDUID of the first terminal. Among the multiple management and control network elements included, the identification of the first management and control network element that stores the discovery parameters of the first terminal is stored, so that the discovery parameters of the first terminal can be subsequently obtained from the first management and control network element. Therefore, this solution can solve the problem that the second management and control network element does not know which management and control network element in the PLMN where the first terminal is located to obtain the discovery parameters of the first terminal, and the second management and control network element cannot obtain the discovery parameters of the first terminal.

In a possible design, the PDUID of the first terminal includes the first identifier, the first identifier is the identifier of the public land mobile network PLMN where the first terminal is located, and the second management and control network element stores the first terminal according to the PDUID of the first terminal. The network element sending the first message includes: the second management and control network element obtains the identifier of the first storage network element in the PLMN corresponding to the first identifier from the network function library function network element according to the first identifier. The second management and control network element sends the first message to the first storage network element according to the identifier of the first storage network element.

That is, the second management and control network element may determine the first storage network element according to the PLMN identification included in the PDUID of the first terminal.

On the other hand, the embodiment of the present application provides a communication method, which can be applied to the first storage network element. The method includes: a first storage network element receives first information from a first management and control network element, the first information includes a proximity service discovery user equipment identification PDUID of the first terminal and an identification of the first management and control network element. The first storage network element stores the correspondence between the PDUID of the first terminal and the identification of the first management and control network element. The first storage network element receives a first message from the second management and control network element, the first message includes the PDUID of the first terminal, and the first message is used to obtain the identification of the management and control network element corresponding to the PDUID of the first terminal. The first storage network element sends the identifier of the first management and control network element to the second management and control network element according to the first message and the corresponding relationship.

In this solution, the first storage network element may store the correspondence between the PDUID of the first terminal and the identification of the first management and control network element. Therefore, in the case that each PLMN includes multiple management and control network elements, the first storage network element can provide the second management and control network corresponding to the second terminal with the information contained in the PLMN where the first terminal is located according to the PDUID of the first terminal. Among the management and control network elements, the identification of the first management and control network element that stores the discovery parameters of the first terminal. In this way, the second management and control network element can obtain the discovery parameter of the first terminal from the first management and control network element. Therefore, this solution can solve the problem that the second management and control network element does not know which management and control network element in the PLMN where the first terminal is located to obtain the discovery parameters of the first terminal, and the second management and control network element cannot obtain the discovery parameters of the first terminal.

In a possible design, the method further includes: the first storage network element receives a first deletion request message from the first management and control network element, and the first deletion request message is used to request to delete the PDUID and the first management and control of the first terminal. Correspondence between the identities of the network elements. The first storage network element deletes the correspondence between the PDUID of the first terminal and the identifier of the first management and control network element according to the first deletion request message.

In this way, the first storage network element may delete the correspondence between the PDUID of the first terminal and the identifier of the first management and control network element according to the request of the first management and control network element.

In another possible design, the first information further includes first indication information, and the first indication information is used to indicate the validity period of the PDUID of the first terminal. The method further includes: when the validity period of the PDUID of the first terminal expires, the first storage network element deletes the correspondence between the PDUID of the first terminal and the identity of the first management and control network element.

In this way, the first storage network element may delete the correspondence between the PDUID of the first terminal and the identity of the first management and control network element when the validity period of the PDUID of the first terminal expires according to the first indication information.

On the other hand, the embodiment of the present application provides a communication method, which can be applied to the first management and control network element. The method may include: the first management and control network element acquires second information, the second information includes a restricted proximity service application user identification RPAUID of the first terminal for the first application and a discovery parameter, and the discovery parameter is used for D2D discovery. The first management and control network element sends second information to the first storage network element, and the second information is used by the first storage network element to save the correspondence between the RPAUID and the discovery parameter.

In this solution, the first management and control network element corresponding to the first terminal may register the correspondence between the RPAUID of the first terminal for the first application and the discovery parameter on the first storage network element. In this way, the first storage network element can provide the discovery parameter corresponding to the RPAUID to the second management and control network element corresponding to the second terminal. Therefore, this solution can solve the problem that the second management and control network element does not know which management and control network element in the PLMN where the first terminal is located to obtain the discovery parameters of the first terminal, and the second management and control network element cannot obtain the discovery parameters of the first terminal.

In a possible design, the method further includes: when the validity period of the discovery parameter expires, the first management and control network element sends a second deletion request message to the first storage network element, and the second deletion request message is used to request deletion of the RPAUID Correspondence with discovery parameters.

In this solution, the first management and control network element may request the first storage network element to delete the correspondence between the RPAUID and the discovery parameter after the validity period of the discovery parameter expires.

In another possible design, the second information further includes second indication information, and the second indication information is used to indicate the validity period of the discovery parameter.

In this solution, the second information may include second indication information for indicating the validity period of the discovery parameter, so that the first storage network element can delete the RPAUID and the discovery parameter after the validity period of the discovery parameter expires according to the second indication information. Correspondence between parameters.

On the other hand, the embodiment of the present application provides a communication method, which can be applied to the second management and control network element. The method includes: the second management and control network element receives the target proximity discovery user equipment identification PDUID from the server of the first application, and the target PDUID includes the PDUID of the first terminal. The second management and control network element sends a second message to the first storage network element according to the PDUID of the first terminal. The second message includes the restricted proximity service application user identification RPAUID of the first terminal for the first application, and the second message is used to obtain Discovery parameter corresponding to RPAUID. The second management and control network element receives the discovery parameter from the first storage network element, and the discovery parameter is used for D2D discovery.

In this solution, the second management and control network element corresponding to the second terminal can determine the first storage network element according to the PDUID of the first terminal, and directly obtain the discovery parameter corresponding to RPAUID from the first storage network element, so as to solve the second problem. The management and control network element does not know which management and control network element in the PLMN where the first terminal is located to obtain the discovery parameter of the first terminal, and the second management and control network element cannot obtain the discovery parameter of the first terminal.

In a possible design, the PDUID of the first terminal includes a first identifier, and the first identifier is an identifier of the public land mobile network PLMN where the first terminal is located. The second management and control network element sends a second message to the first storage network element according to the PDUID of the first terminal, including: the second management and control network element obtains the PLMN corresponding to the first identifier from the network function library function network element according to the first identifier The identification of the first storage network element. The second management and control network element sends a second message to the first storage network element according to the identifier of the first storage network element.

On the other hand, the embodiment of the present application provides a communication method, which can be applied to the first storage network element. The method may include: the first storage network element receives second information from the first management and control network element, the second information includes the restricted proximity service application user identification RPAUID of the first terminal for the first application and discovery parameters, and the discovery parameters are used for D2D found. The first storage network element stores the correspondence between the RPAUID and the discovery parameter. The first storage network element receives a second message from the second management and control network element, the second message includes the RPAUID, and the second message is used to obtain the discovery parameter corresponding to the RPAUID. The first storage network element sends the discovery parameter to the second management and control network element according to the second message and the corresponding relationship.

In this solution, the first storage network element may store the correspondence between the RPAUID of the first terminal for the first application and the discovery parameter, so as to provide the discovery parameter corresponding to the RPAUID to the second management and control network element of the second terminal. Therefore, this solution can solve the problem that the second management and control network element does not know which management and control network element in the PLMN where the first terminal is located to obtain the discovery parameters of the first terminal, and the second management and control network element cannot obtain the discovery parameters of the first terminal.

In a possible design, after the first storage network element receives the second information from the first management and control network element, the method may further include: the first storage network element receives the second deletion request from the first management and control network element Message, the second delete request message is used to request to delete the correspondence between the RPAUID and the discovery parameter. The first storage network element deletes the correspondence between the RPAUID and the discovery parameter according to the second deletion request message.

In this way, the first storage network element can delete the correspondence between the RPAUID and the discovery parameter according to the request of the first management and control network element.

In another possible design, the second information further includes second indication information, and the second indication information is used to indicate the validity period of the discovery parameter. After the first storage network element receives the second information from the first management and control network element, the method further includes: when the validity period of the discovery parameter expires, the first storage network element deletes the correspondence between the RPAUID and the discovery parameter.

In this way, the first storage network element can delete the correspondence between the RPAUID and the discovery parameter when the validity period of the PDUID of the first terminal expires.

On the other hand, an embodiment of the present application provides a communication device including a processing module and a transceiver module. Wherein, the processing module is used for: assigning the proximity service discovery user equipment PDUID to the first terminal through the transceiver module. The first information is sent to the first storage network element through the transceiver module. The first information includes the PDUID of the first terminal and the identification of the first management and control network element. The first information is used by the first storage network element to store the PDUID and the first terminal of the first terminal. 1. Correspondence between the identifiers of the management and control network elements. Wherein, the communication device stores the discovery parameter of the first terminal, and the discovery parameter is used for D2D discovery.

In a possible design, the processing module is further configured to send an authorization request message to the server of the first application before sending the first information to the first storage network element through the transceiver module, and the authorization request message is used to request authorization for the first storage network element. The terminal performs D2D discovery for the first application. An authorization response message from the server is received through the transceiver module, where the authorization response message is used to indicate that the first terminal is successfully authorized to perform D2D discovery for the first application.

In another possible design, the processing module is further configured to: before sending the first information to the first storage network element through the transceiver module, receive a discovery request message from the first terminal, and the discovery request message is used to request D2D discovery .

In another possible design, the discovery request message includes the restricted proximity service application user identification RPAUID of the first terminal for the first application. The processing module is further configured to: before sending the first information to the first storage network element through the transceiver module, allocate a discovery parameter according to the discovery request message, and the discovery parameter corresponds to the RPAUID.

In another possible design, the processing module is further configured to send a discovery response message to the first terminal before sending the first information to the first storage network element through the transceiver module, and the discovery response message includes the discovery parameter.

In another possible design, the processing module is further configured to: when the validity period of the PDUID of the first terminal expires, send a first deletion request message to the first storage network element through the transceiver module, and the first deletion request message is used for Request to delete the correspondence between the PDUID of the first terminal and the identifier of the first management and control network element.

On the other hand, an embodiment of the present application provides a communication device including a processing module and a transceiver module. Wherein, the processing module is configured to: receive the second terminal target proximity discovery user equipment identification PDUID from the server of the first application through the transceiver module, and the target PDUID includes the PDUID of the first terminal. According to the PDUID of the first terminal, the transceiver module sends a first message to the first storage network element. The first message includes the PDUID of the first terminal. Logo. The identifier of the first management and control network element is received from the first storage network element through the transceiver module, and the first management and control network element stores the discovery parameter of the first terminal.

In a possible design, the PDUID of the first terminal includes a first identifier, and the first identifier is an identifier of the public land mobile network PLMN where the first terminal is located. The processing module is specifically configured to: according to the first identifier, obtain the identifier of the first storage network element in the PLMN corresponding to the first identifier from the network function library functional network element. According to the identifier of the first storage network element, the first message is sent to the first storage network element through the transceiver module.

On the other hand, an embodiment of the present application provides a communication device including a processing module and a transceiver module. The processing module is configured to receive first information from the first management and control network element through the transceiver module, the first information including the proximity service discovery user equipment identification PDUID of the first terminal and the identification of the first management and control network element. The corresponding relationship between the PDUID of the first terminal and the identification of the first management and control network element is stored. The first message from the second management and control network element is received through the transceiver module, the first message includes the PDUID of the first terminal, and the first message is used to obtain the identification of the management and control network element corresponding to the PDUID of the first terminal. According to the first message and the corresponding relationship, the identifier of the first management and control network element is sent to the second management and control network element through the transceiver module.

In a possible design, the processing module is further configured to: receive a first delete request message from the first management and control network element through the transceiver module, and the first delete request message is used to request to delete the PDUID and the first management network of the first terminal. Correspondence between the identities of the meta. According to the first deletion request message, the correspondence between the PDUID of the first terminal and the identification of the first management and control network element is deleted.

In another possible design, the first information further includes first indication information, and the first indication information is used to indicate the validity period of the PDUID of the first terminal. The processing module is further configured to: when the validity period of the PDUID of the first terminal expires, delete the correspondence between the PDUID of the first terminal and the identity of the first management and control network element.

On the other hand, an embodiment of the present application provides a communication device including a processing module and a transceiver module. The processing module is used to obtain second information, the second information includes the restricted proximity service application user identification RPAUID of the first terminal for the first application and discovery parameters, and the discovery parameters are used for D2D discovery. The second information is sent to the first storage network element through the transceiver module, and the second information is used by the first storage network element to save the correspondence between the RPAUID and the discovery parameter.

In a possible design, the processing module is also used to: when the validity period of the parameter is found to expire, send a second delete request message to the first storage network element through the transceiver module, and the second delete request message is used to request deletion of RPAUID and Find the correspondence between the parameters.

On the other hand, an embodiment of the present application provides a communication device including a processing module and a transceiver module. Wherein, the processing module is configured to receive the second terminal target proximity discovery user equipment identification PDUID from the server of the first application through the transceiver module, and the target PDUID includes the PDUID of the first terminal. According to the PDUID of the first terminal, a second message is sent to the first storage network element through the transceiver module. The second message includes the restricted proximity service application user identification RPAUID of the first terminal for the first application. The second message is used to obtain the corresponding RPAUID. The discovery parameters. The discovery parameter is received from the first storage network element through the transceiver module, and the discovery parameter is used for D2D discovery.

In a possible design, the PDUID of the first terminal includes a first identifier, and the first identifier is an identifier of the public land mobile network PLMN where the first terminal is located. The processing module is specifically configured to: according to the first identifier, obtain the identifier of the first storage network element in the PLMN corresponding to the first identifier from the network function library functional network element. According to the identifier of the first storage network element, the second message is sent to the first storage network element through the transceiver module.

On the other hand, an embodiment of the present application provides a communication device including a processing module and a transceiver module. The processing module is used to receive second information from the first management and control network element through the transceiver module, the second information includes the restricted proximity service application user identification RPAUID of the first terminal for the first application and discovery parameters, and the discovery parameters are used for D2D found. Store the correspondence between RPAUID and discovery parameters. The second message from the second management and control network element is received through the transceiver module, the second message includes the RPAUID, and the second message is used to obtain the discovery parameter corresponding to the RPAUID. According to the second message and the corresponding relationship, the discovery parameter is sent to the second management and control network element through the transceiver module.

In a possible design, the processing module is further configured to: after receiving the second information from the first management and control network element through the transceiver module, receive the second delete request message from the first management and control network element through the transceiver module, and the second The delete request message is used to request to delete the correspondence between the RPAUID and the discovery parameter. According to the second deletion request message, the correspondence between the RPAUID and the discovery parameter is deleted.

In another possible design, the second information further includes second indication information, the second indication information is used to indicate the validity period of the discovery parameter; After the second information, when the validity period of the discovery parameter expires, the corresponding relationship between the RPAUID and the discovery parameter is deleted.

In another aspect, an embodiment of the present application provides a communication device for implementing the foregoing various communication methods. The communication device may be the above-mentioned first management and control network element, or a device including the above-mentioned first management and control network element; or, the communication device may be the above-mentioned second management and control network element, or a device including the above-mentioned second management and control network element; or, The communication device may be the above-mentioned first storage network element, or a device including the above-mentioned first storage network element. The communication device includes corresponding modules, units, or means for implementing the above methods, and the modules, units, or menas can be implemented by hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above-mentioned functions.

In another aspect, an embodiment of the present application provides a communication device, including: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device can execute any of the foregoing aspects. A possible design approach. The communication device may be the above-mentioned first management and control network element, or a device including the above-mentioned first management and control network element; or, the communication device may be the above-mentioned second management and control network element, or a device including the above-mentioned second management and control network element; or, The communication device may be the above-mentioned first storage network element, or a device including the above-mentioned first storage network element.

In another aspect, an embodiment of the present application provides a communication device, including: a processor; the processor is configured to couple with a memory, and after reading an instruction in the memory, execute any one of the above-mentioned aspects according to the instruction. Methods. The communication device may be the above-mentioned first management and control network element, or a device including the above-mentioned first management and control network element; or, the communication device may be the above-mentioned second management and control network element, or a device including the above-mentioned second management and control network element; or, The communication device may be the above-mentioned first storage network element, or a device including the above-mentioned first storage network element.

In another aspect, an embodiment of the present application provides a computer-readable storage medium that stores instructions in the computer-readable storage medium. When the computer-readable storage medium runs on a computer, the computer can execute any of the above-mentioned aspects. Method in design.

In another aspect, the embodiments of the present application provide a computer program product containing instructions, which when run on a computer, enable the computer to execute any of the possible design methods in any of the foregoing aspects.

In another aspect, an embodiment of the present application provides a communication device (for example, the communication device may be a chip or a system on a chip), the communication device includes a processor, and is used to implement any of the above-mentioned aspects in any possible design. method. In a possible design, the communication device further includes a memory for storing necessary program instructions and data. When the communication device is a system-on-chip, it may be composed of a chip, or may include a chip and other discrete devices.

In another aspect, an embodiment of the present application provides a communication system. The communication system may include a first management and control network element, a second management and control network element, and a first storage network element. Each device in the communication system can execute any possible design method in any one of the foregoing aspects.

In another aspect, an embodiment of the present application provides a communication system. The communication system may include a first management and control network element, a second management and control network element, a first storage network element, a first terminal, and a second terminal. Each device in the communication system can execute any possible design method in any one of the foregoing aspects.

In another aspect, an embodiment of the present application provides a communication system, which may include a first management and control network element, a second management and control network element, a first storage network element, a first terminal, a second terminal, and a first application Server. Each device in the communication system can execute any possible design method in any one of the foregoing aspects.

Any of the above-provided devices or computer storage media or computer program products or chips or communication systems are used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the corresponding ones provided above The beneficial effects of the corresponding solutions in the method will not be repeated here.

These and other aspects of the application will be more concise and understandable in the description of the following embodiments.

Description of the drawings

FIG. 1 is a schematic diagram of the architecture of a 5G network system provided by an embodiment of this application;

2A is a schematic structural diagram of a D2D communication system provided by an embodiment of this application;

2B is a schematic structural diagram of another D2D communication system provided by an embodiment of the application;

2C is a schematic diagram of a system architecture on the network side in a D2D communication system provided by an embodiment of this application;

FIG. 3 is a schematic structural diagram of a communication device provided by an embodiment of this application;

FIG. 4 is a flowchart of a communication method provided by an embodiment of this application;

FIG. 5A is a flowchart of another communication method provided by an embodiment of this application;

FIG. 5B is a flowchart of another communication method provided by an embodiment of this application;

FIG. 6 is a flowchart of another communication method provided by an embodiment of this application;

FIG. 7 is a flowchart of another communication method provided by an embodiment of this application;

FIG. 8A is a flowchart of another communication method provided by an embodiment of this application;

FIG. 8B is a flowchart of another communication method provided by an embodiment of this application;

FIG. 9A is a schematic structural diagram of a D2D communication system provided by an embodiment of this application;

FIG. 9B is a schematic structural diagram of another D2D communication system provided by an embodiment of this application;

FIG. 10 is a flowchart of another communication method provided by an embodiment of this application;

FIG. 11 is a flowchart of another communication method provided by an embodiment of this application;

FIG. 12 is a flowchart of another communication method provided by an embodiment of this application;

FIG. 13 is a schematic structural diagram of a communication device provided by an embodiment of the application.

Detailed ways

For ease of understanding, some illustrations of concepts related to the embodiments of the present application are given as examples for reference. As follows:

D2D communication: A wireless D2D communication link is directly established between terminals, so that D2D communication is performed based on the D2D communication link. For example, two terminals can perform D2D communication through a ProSe Communication 5 (PC5) interface. Specifically, D2D communication can reuse the resources of the mobile cellular network. For example, a terminal performing D2D communication can obtain frequency resources required for D2D communication under the control of a (wireless) access network device in a cellular network, thereby establishing a D2D communication link, and performing D2D communication based on the D2D communication link. Without going through the (wireless) access network equipment and other equipment in the cellular network.

Among them, D2D communication can be applied to but not limited to the following areas: social applications (for example, online games, sharing videos or photos when friends meet, or sharing files and materials during company meetings, etc.), local services (for example, shopping malls for nearby users Advertising information service), network relay (for example, when the cellular signal of a certain terminal is not good, the terminal can communicate with the (wireless) access network equipment and the cellular network through D2D communication with other terminals), Public safety (for example, in some special scenarios such as the destruction of (wireless) access network equipment, the terminal cannot perform cellular communication, but can conduct rescue contact through D2D communication), or vehicle to everything (V2X), etc.

D2D discovery: The process of discovering terminals based on D2D discovery parameters (hereinafter also referred to as discovery parameters for short). After the D2D discovery process, a D2D communication link can be established between the terminals to perform D2D communication. Among them, D2D discovery has two discovery types, namely, open discovery and restricted discovery. Among them, public discovery finds a terminal that uses a specific target application through D2D discovery, and all terminals that can use or are authorized to use the specific target application are publicly discovered target terminals. Restricted discovery finds a specific terminal that uses a specific target application through D2D discovery, and the specific terminal that can use or is authorized to use the specific target application is the target terminal of the restricted discovery.

In addition, D2D discovers that there are two discovery models, namely model A and model B. In mode A, D2D communication terminals may include announcing terminals and monitoring terminals, and mode A supports public discovery and restricted discovery. In mode B, D2D communication terminals may include a discovered terminal (Discoveree) and a discovery terminal (Discoverer), and mode B only supports restricted discovery.

Discovery parameters and discovery matching parameters: parameters used in the D2D discovery process. Among them, the discovery matching parameter can be generated according to the discovery parameter. For example, in mode A, the publishing terminal uses the discovery parameter to find the target terminal or the terminal using the target application, and specifically broadcasts the discovery parameter by sending a wireless broadcast message. The listening terminal receives the discovery parameter in the wireless broadcast message, and compares it with the discovery matching parameter provided by the network side to determine whether it is the target terminal being sought or the terminal using the target application being sought. In mode A, the discovery parameter of the publishing terminal may include the ProSe Restricted Code, and the discovery matching parameter of the listening terminal may include the Discovery Filter.

In the description of this application, unless otherwise specified, "/" means "or". For example, A/B can mean A or B. "And/or" in this article is only an association relationship describing the associated objects, which means that there can be three kinds of relationships. For example, A and/or B can mean: A alone exists, A and B exist at the same time, and B exists alone. These three situations. In addition, "at least one" means one or more, and "plurality" means two or more. The words "first" and "second" do not limit the quantity and order of execution, and the words "first" and "second" do not limit the difference.

It should be noted that in this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or illustrations. Any embodiment or design solution described as "exemplary" or "for example" in this application should not be construed as being more preferable or advantageous than other embodiments or design solutions. To be precise, words such as "exemplary" or "for example" are used to present related concepts in a specific manner.

In the embodiments of the present application, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects before and after are in an "or" relationship. "The following at least one item (a)" or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a). For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple .

The embodiment of the application relates to a D2D communication system. The D2D communication system can be combined with a third generation partnership project (3rd generation partnership project, 3GPP) communication system, or can be combined with a non-3GPP communication system without limitation. For example, a 3GPP communication system may include a 5G network system, a new radio (NR) system, or a future evolution communication system.

Among them, the 5G network system may be a non-standalone (NSA) 5G network system or a standalone (SA) 5G network system. Exemplarily, FIG. 1 shows a schematic diagram of the architecture of a 5G network system. The architecture may include terminals, (radio) access network ((radio) access network, (R) AN) equipment, access and mobility management function (access and mobility management function, AMF) network elements, network slice selection function ( network slice selection function (NSSF) network element, unified data management (unified data management, UDM) network element, unified data repository (UDR) network element, policy control function (PCF) network element, Network exposure function (NEF) network element, binding support function (BSF) network element, network function repository function (NRF) network element or session management function (session management function, SMF) One or more of equipment such as network elements.

Among them, a terminal is an entity on the user side that is used to receive signals, or send signals, or receive signals and send signals. The terminal can also be called user equipment (UE), terminal equipment, access terminal, user unit, user station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent or User device. The terminal can also be a D2D device. For example, the D2D device may be an electric meter, a water meter, and so on. The D2D device can also be a V2X device, such as a smart car (smart car or intelligent car), a digital car (digital car), an unmanned car (unmanned car or driverless car or pilotless car or automobile), and an automatic car (self-driving car). (Or autonomous car), pure electric vehicle (pure EV or Battery EV), hybrid electric vehicle (hybrid electric vehicle, HEV), extended-range electric vehicle (range extended EV, REEV), plug-in hybrid electric vehicle (plug-in HEV) , PHEV), new energy vehicle (new energy vehicle), road site unit (RSU). The D2D device may also be a B2C device or a B2B device. In addition, the terminal in the embodiment of the present application may also be a mobile station (MS), subscriber unit (subscriber unit), drone, Internet of things (IoT) equipment, and station in WLAN. ST), cellular phone, smart phone, cordless phone, wireless data card, tablet computer, session initiation protocol (SIP) phone, wireless local loop (WLL) ) Station, personal digital assistant (PDA) equipment, laptop computer, AR equipment, VR equipment or machine type communication (MTC) terminal. The terminal may also be a handheld device with a wireless communication function, a computing device, or other processing devices connected to a wireless modem, a vehicle-mounted device, or a wearable device, etc. The terminal may also be a terminal in a next-generation communication system, for example, a terminal in a 5G system or a terminal in a future evolved communication system, a terminal in an NR system, and so on.

The (R)AN device in this architecture is a device that provides wireless communication functions for the terminal. (R) AN equipment includes, but is not limited to: next-generation base stations (gnodeB, gNB), evolved node B (evolved node B, eNB), radio network controller (RNC), node B ( node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved nodeB, or home node B, HNB), baseband unit (baseBand unit) , BBU), transmission point (transmitting and receiving point, TRP), transmission point (transmitting point, TP), mobile switching center, etc.

In this architecture, the AMF network element is used for mobility management in the mobile network, such as user location update, user registration network, user handover, and so on. NEF network elements are used to provide services so that the 3GPP network can safely provide network service capabilities to third-party equipment of a third-party service provider (service provider, SP). PCF network elements are used to guide a unified policy framework for network behaviors, and provide policy rule information for control plane functional network elements (such as AMF network elements, etc.). UDM network elements are used to process user identification, access authentication, registration, or mobility management, etc. UDR network elements are used to store and query structured data. Among them, structured data is data whose structure and semantics are defined by standards, and all parties can understand the meaning represented by the data according to the standards. UDR network elements can store and query contract data by UDM network elements, PCF network elements can store or query policy data, and application functions can also store and query application-related data directly or through NEF network elements. The NSSF network element is used to select network slices for the terminal, etc. The BSF network element is used to provide the session binding function, bind the association relationship between the terminal session and the PCF network element, and is used for the NEF network element or other network elements to query the PCF network element corresponding to the terminal session. NRF network elements are used to support network element registration and discovery, such as accepting network element discovery requests and returning network function entity information required by the network element; accepting network element registration requests and maintaining overview information and support of all available network element function entities Service.

In addition, the architecture may also include user plane function (UPF) network elements, data network (DN) network elements, application function (AF) network elements, or authentication server function (authentication server function). AUSF) network elements and other network elements, the embodiments of this application will not list them one by one.

FIG. 2A shows a schematic structural diagram of a D2D communication system provided by an embodiment of the present application. The D2D communication system may be combined with the 5G network system shown in FIG. 1 or other communication systems. As shown in FIG. 2A, the D2D communication system 10 may include multiple terminals 11, (R)AN devices 12, a core network 13, and a proximity service application server (Proximity service application server, ProSe AS) 14 and so on. Among them, between the terminal and the terminal, the terminal and the (R)AN device can use radio access technology (RAT) to communicate with each other. The RAT technology can include LTE technology (for example, in the NSA 5G system), and NR Technology or other technologies, such as: NR+ technology, etc. The core network 13 may include, but is not limited to, an access and mobility management function network element 131, a management and control network element 132, and a storage network element 133. In the D2D communication system, each PLMN includes multiple management and control network elements and one storage network element. It can be understood that the D2D communication system shown in FIG. 2A may also include other network elements, which are not limited in the embodiment of the present application.

In the D2D communication system, the terminal can obtain the discovery parameters through the management and control network elements and the storage network elements, so as to perform the D2D discovery process based on the discovery parameters. Then, after the D2D discovery process is completed, the two terminals can also obtain the frequency resources required for D2D communication under the control of the (R)AN device, thereby establishing a D2D communication link based on the obtained frequency resources, and based on the D2D communication link Direct D2D communication.

It should be noted that the system architecture and business scenarios described in this application are intended to more clearly illustrate the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. Those of ordinary skill in the art will know that, With the evolution of the system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are equally applicable to similar technical problems.

For the explanation of the terminal shown in FIG. 2A, reference may be made to the above-mentioned related description about the terminal shown in FIG. 1. Moreover, in the D2D communication system, the terminal can support D2D discovery and D2D communication. In the D2D discovery process, the terminal can communicate with other devices through the (R)AN device to receive or send information in the D2D discovery process, or the terminal can communicate with other terminals through broadcast (for example, broadcast/monitor discovery parameters) . In the D2D communication process, the terminals can directly receive or send the data plane information and control plane information in the D2D communication process through the PC5 interface.

In mode A, the terminal shown in FIG. 2A may include an announcing terminal and a monitoring terminal. In mode B, the terminal shown in FIG. 2A may include a discovered (Discoveree) terminal and a discovered (Discoverer) terminal.

For the explanation of the (R)AN device shown in FIG. 2A, refer to the above-mentioned related description about the (R)AN device shown in FIG. 1, which will not be repeated here.

For the access and mobility management function network element shown in FIG. 2A, its functions can be referred to the above description about the function of the AMF network element shown in FIG. 1. It is understandable that when the D2D communication system is combined with the 5G network, the access and mobility management function network element can be an AMF network element; when the D2D system is combined with other communication systems such as the future 6G network, the access and mobility management The mobility management function network element may have other names.

The management and control network element shown in FIG. 2A may be used to allocate discovery parameters to the terminal, and the discovery parameters are used for D2D discovery. The management and control network element can also be used for the management and storage of other parameters in the D2D discovery process and/or D2D communication process. For example, the management and control network element may be used for the allocation of D2D communication parameters of the terminal. The D2D communication parameters may include: range parameters used to characterize the D2D communication area, such as a PLMN that allows D2D communication, or when the terminal is outside the network coverage area. Allowed D2D communication frequency bands, etc. The management and control network element can also be used to exchange information with the core network element, for example, interact with the UDR network element to exchange terminal D2D subscription information.

The management and control network element may also be used to send authorization information for D2D communication and/or D2D discovery to the terminal. For example, the management and control network element may be a network element in an existing communication system, such as a PCF network element in the 5G network shown in FIG. 1, or a newly-added network element, which is not limited in the embodiment of the present application.

In the embodiments of the present application, the publishing terminal and the discovered terminal may be referred to as the first terminal, and the listening terminal and the discovery terminal may be referred to as the second terminal. The management and control network element shown in FIG. 2A may include a first management and control network element and a second management and control network element. Among them, the first management and control network element may allocate PDUID and discovery parameters to the first terminal, which may be referred to as the management and control network element corresponding to the first terminal. Further, the first management and control network element may also send some parameters in the D2D discovery process to the storage network element in the PLMN where the first terminal is located, such as the PDUID of the first terminal and the identity of the first management and control network element, or the first terminal is directed to The RPAUID and discovery parameters of the first application.

The second management and control network element may allocate a PDUID to the second terminal, which may be referred to as a management and control network element corresponding to the second terminal. The second management and control network element may obtain the identifier of the first management and control network element from the storage network element. Alternatively, the second management and control network element may obtain the discovery parameter of the first terminal from the storage network element.

The storage network element shown in FIG. 2A may be used to receive part of the parameters in the D2D discovery process from the first management and control network element, and save the correspondence between the parameters. The storage network element may also provide the identification of the first management and control network element or the discovery parameter of the first terminal to the second management and control network element according to the stored correspondence relationship.

For example, the storage network element can be a network element in an existing communication system, such as a UDM network element, a UDR network element, or a BSF network element in the 5G network shown in Figure 1, or it can be a newly added network element. The embodiment is not limited.

The proximity service application server ProSe AS shown in FIG. 2A may be used to authorize the first terminal to perform D2D discovery for the first application. Among them, the first application is a proximity service application (or called proximity service-based application, short-distance service-based application, short-distance service application, proximity application, D2D application, etc.).

According to the above description, in the D2D communication system, each PLMN may include multiple management and control network elements and one storage network element. The terminals in the D2D communication system may include the first terminal and the second terminal. The management and control network in the D2D communication system The element may include a first management and control network element and a second management and control network element. Based on this, FIG. 2B shows another schematic diagram of the architecture of the D2D communication system provided by an embodiment of the present application.

As shown in FIG. 2B, the D2D communication system 20 may include a first terminal 21, a first management network element 22 corresponding to the first terminal 21, a first storage network element 23, a second terminal 24, and a first terminal 24 corresponding to the second terminal 24. 2. Manage and control the network element 25, and the neighboring service application server 26 and other equipment. It is understandable that the D2D communication system shown in FIG. 2B may also include other network elements, which will not be listed here. The first storage network element 23 is a storage network element in the PLMN where the first terminal 21 is located.

In addition, FIG. 2C shows a schematic diagram of a system architecture on the network side in a D2D communication system. The system architecture on the network side includes a first management and control network element, a second management and control network element, and a first storage network element.

The above mainly describes the architecture of the D2D communication system. It is understandable that the network elements, functions, or devices in the above D2D communication system can be network elements in hardware devices, software functions running on dedicated hardware, or instantiation on a platform (for example, a cloud platform) Virtualization capabilities. The above-mentioned network elements or functions can be divided into one or more services, and further, there may be services independent of network functions.

For example, the above-mentioned network elements, functions or equipment may be implemented by the communication equipment (also referred to as a communication device) in FIG. 3. FIG. 3 shows a schematic diagram of the hardware structure of a communication device provided by an embodiment of the application. The communication device 300 includes a processor 301, a communication line 302, a memory 303, and at least one communication interface (in FIG. 3, it is only exemplary and the communication interface 304 is included as an example for illustration).

The processor 301 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more programs for controlling the execution of the program of this application. integrated circuit.

The communication line 302 may include a path to transmit information between the aforementioned components.

The communication interface 304 uses any device such as a transceiver to communicate with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. . For example, when the communication device 300 is a terminal, the communication interface 304 may include a Uu interface or a PC5 interface.

The memory 303 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types that can store information and instructions The dynamic storage device can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disk storage, optical disc storage (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program codes in the form of instructions or data structures and can be used by a computer Any other media accessed, but not limited to this. The memory may exist independently, and is connected to the processor through the communication line 302. The memory can also be integrated with the processor.

Among them, the memory 303 is used to store computer instructions for executing the solution of the present application, and the processor 301 controls the execution. The processor 301 is configured to execute computer instructions stored in the memory 303, so as to implement the actions of each network element in the communication method provided in the following embodiments of the present application, for example, the first managed network element, the second managed network element, or the second managed network element. The action of a storage network element.

For example, when the communication device is a storage network element, the memory 303 may also be used to store the correspondence between the PDUID of the first terminal and the identity of the first management and control network element, or store the RPAUID and the RPAUID of the first terminal for the first application. Find the correspondence between the parameters.

Optionally, the computer instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.

In a specific implementation, as an embodiment, the processor 301 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 3.

In a specific implementation, as an embodiment, the communication device 300 may include multiple processors, such as the processor 301 and the processor 308 in FIG. 3. Each of these processors can be a single-CPU (single-CPU) processor or a multi-core (multi-CPU) processor. The processor here may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).

In a specific implementation, as an embodiment, the communication device 300 may further include an output device 305 and an input device 306. The output device 305 communicates with the processor 301 and can display information in a variety of ways. For example, the output device 305 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector (projector) Wait. The input device 306 communicates with the processor 301 and can receive user input in a variety of ways. For example, the input device 306 may be a mouse, a keyboard, a touch screen device, a sensor device, or the like.

The aforementioned communication device 300 may be a general-purpose device or a special-purpose device. In a specific implementation, the communication device 300 may be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, an embedded device, or a similar structure in Figure 3 equipment. The embodiment of the present application does not limit the type of the communication device 300.

The above mainly describes the architecture of the D2D communication system and the structure of the communication equipment in the architecture. The following describes the communication method provided in the embodiments of the present application based on the structure of the D2D communication system and communication device provided above.

It can be known from the prior art that when the D2D communication system is combined with the 4G communication system, the terminal discovers other terminals through the discovery parameters allocated to the terminal by the ProSe Function network element before performing D2D communication. Taking mode A as an example, the publishing terminal A can obtain the discovery parameters of the publishing terminal A from the ProSe Function network element; the monitoring terminal can obtain the discovery parameters of the publishing terminal to be monitored (for example, publishing terminal A) from the ProSe Function network element, and according to Publish the discovery parameters of terminal A to generate a discovery filter (for example, Discovery Filter). The publishing terminal A broadcasts the discovery parameter after acquiring the discovery parameter. The listening terminal uses the discovery matching parameter to match the discovery parameter it receives. When the listening terminal monitors the discovery parameter that matches the discovery matching parameter, it determines that the publishing terminal A is found. Then, the monitoring terminal establishes a D2D communication link with the publishing terminal A and performs D2D communication.

When the D2D communication system is combined with a 5G network system or a future evolved communication system network, the function of assigning discovery parameters to the terminal can be implemented on the management and control network element. Since the PLMN where the publishing terminal to be monitored is located includes multiple management and control network elements, how the monitoring terminal can obtain the discovery parameters of the publishing terminal to be monitored based on the multiple management and control network elements is an important issue to be solved urgently.

Based on the D2D communication system shown in FIG. 2B, an embodiment of the present application provides a communication method that can be used for D2D discovery. The method includes: the first management and control network element may allocate PDUID and discovery parameters to the first terminal, and send the PDUID of the first terminal and the identification of the first management and control network element to the first storage network element. The first storage network element stores the correspondence between the PDUID of the first terminal and the identification of the first management and control network element. The second management and control network element receives the target PDUID of the second terminal from the server of the first application, where the target PDUID includes the PDUID of the first terminal. The second management and control network element obtains the identification of the first management and control network element from the first storage network element according to the PDUID of the first terminal. In this way, the second management and control network element can obtain the discovery parameter of the first terminal from the first management and control network element, so that the discovery parameter can be provided to the second terminal. Therefore, in the case where the PLMN where the first terminal is located includes multiple management and control network elements, the second terminal can acquire the discovery parameters of the first terminal.

Based on the D2D communication system shown in FIG. 2B, the embodiment of the present application also provides another communication method, which can be used for D2D discovery. The method includes: the first management and control network element obtains the RPAUID and the discovery parameter of the first terminal for the first application, and sends the RPAUID and the discovery parameter to the first storage network element. The first storage network element stores the correspondence between the RPAUID and the discovery parameter. The second management and control network element receives the target PDUID of the second terminal from the server of the first application, where the target PDUID includes the PDUID of the first terminal. The second management and control network element obtains the discovery parameter corresponding to the RPAUID from the first storage network element according to the PDUID of the first terminal. In this way, the second management and control network element can provide the acquired discovery parameters to the second terminal. Therefore, in the case where the PLMN where the first terminal is located includes multiple management and control network elements, the second terminal can acquire the discovery parameters of the first terminal.

The embodiments of the present application can be applied to a scenario where each PLMN includes one storage network element and at least two management and control network elements. The following uses the D2D communication system shown in FIG. 2B as an example to describe the communication method provided in the embodiment of the present application.

FIG. 4 shows a communication method provided by an embodiment of the present application, which can be applied to D2D discovery. The communication method may include:

401. The first management and control network element allocates a PDUID to the first terminal.

For example, the first management and control network element may be the aforementioned PCF network element or a newly added network element.

Exemplarily, after the first terminal is registered on the network, the first management and control network element may also allocate a PDUID to the first terminal, where the PDUID is a user identification of the first terminal.

Optionally, the first management and control network element may allocate a PDUID to the first terminal when at least one of the following conditions is met.

Condition 1. The first terminal has D2D communication capability.

For example, when the first terminal registers to the network, it sends the D2D communication capability information to the first AMF network element in the indicated core network, and the first AMF network element sends the D2D communication capability information to the first management and control network element. Wherein, the D2D communication capability information may be used to indicate that the first terminal has D2D communication capability, that is, supports D2D communication.

It can be understood that the D2D communication capability of the first terminal may include a D2D discovery capability, that is, the first terminal supports D2D discovery.

Condition 2. The first terminal has subscribed to the D2D communication service.

For example, the first management and control network element obtains the subscription information of the first terminal from the unified data repository network element, and the subscription information includes information for indicating that the first terminal has subscribed to the D2D communication service. Specifically, the subscription information may include information used to indicate that the first terminal supports D2D discovery, and information used to indicate that the first terminal supports D2D communication. The subscription information may also include information for indicating that the first terminal is allowed to use mode A or mode B to perform D2D discovery. The subscription information may also include information for indicating that the first terminal is allowed to be a publishing terminal or a discovery terminal.

402. The first management and control network element sends first information to the first storage network element, where the first information includes the PDUID of the first terminal and the identification of the first management and control network element, and the first information is used by the first storage network element to store the first The corresponding relationship between the PDUID of the terminal and the identification of the first management and control network element, the first management and control network element stores the discovery parameter of the first terminal, and the discovery parameter is used for D2D discovery.

Wherein, the identifier of the first management and control network element may be used to identify the first management and control network element, and specifically may be the name, address, etc. of the first management and control network element, which is not limited. For example, when the first management and control network element is the aforementioned PCF network element, the identification of the first management and control network element may be the fully qualified domain name (FQDN) information of the PCF network element or the internet protocol (IP) Address information, etc.

The first storage network element is the storage network element in the PLMN where the first terminal is located. For example, the first storage network element may be the aforementioned UDM network element, UDR network element, or BSF network element, etc., or may be a newly-added network element.

403. The first storage network element receives the first information, and stores the correspondence between the PDUID of the first terminal and the identity of the first management and control network element.

Through the above steps 402-403, the first storage network element can store the corresponding relationship between the PDUID of the first terminal and the identification of the first management and control network element. The corresponding relationship between the identifiers of a management and control network element is registered on the first storage network element. Further, the first storage network element may provide the management and control network elements of other terminals with the identification of the management and control network element corresponding to the first terminal according to the PDUID of the first terminal and the corresponding relationship.

For example, suppose that the first management and control network element is PCF network element 1, and PCF network element 1 stores the discovery parameters of the first terminal, then PCF1 can send the PDUID of the first terminal and the identification of PCF network element 1 to the location of the first terminal Storage network element in PLMN. Correspondingly, the first storage network element stores the correspondence between the PDUID of the first terminal and the identification of the PCF network element 1, so that the management and control network elements corresponding to other terminals can obtain the storage network element from the storage network element according to the PDUID of the first terminal. The identification of the management and control network element with the discovery parameter of the first terminal, that is, the identification of the first management and control network element, and then obtain the discovery parameter of the first terminal from the first management and control network element according to the identification of the first management and control network element.

404. The second management and control network element receives the target PDUID of the second terminal from the server of the first application, where the target PDUID includes the PDUID of the first terminal.

Wherein, the target PDUID may include the PDUID of one or more terminals to be monitored/discovered of the second terminal, and the one or more terminals to be monitored/discovered include the first terminal. In other words, the target PDUID includes the first terminal. The PDUID of the terminal.

Wherein, the first application may be a proximity service application.

For example, the second terminal sends a discovery request message to the second management and control network element, and the discovery request message carries the target RPAUID of the second terminal. The second management and control network element sends an authorization request message to the server of the first application, where the authorization request message carries the target RPAUID. The server of the first application sends an authorization response message to the second management and control network element. The authorization response message is used to indicate that the second terminal is successfully authorized to perform D2D discovery for the first application. The authorization response message may include a target PDUID corresponding to the target RPAUID.

The following will describe how the second management and control network element obtains the discovery parameters of the first terminal as an example. For the PDUIDs of other terminals other than the first terminal in the target PDUID, the discovery parameters of other terminals to be monitored/discovered can be acquired in a similar manner. It can be understood that the above method may further include the following steps.

405. The second management and control network element sends a first message to the first storage network element according to the PDUID of the first terminal, the first message includes the PDUID of the first terminal, and the first message is used to obtain the discovery parameter stored in the first terminal The identity of the management and control network element.

Specifically, the second management and control network element may determine the first storage network element according to the PDUID of the first terminal, so as to send a first message to the first storage network element to request to obtain the information of the management and control network element storing the discovery parameters of the first terminal. Logo.

The PDUID of the first terminal may include a first identifier, and the first identifier is the identifier of the PLMN where the first terminal is located, that is, it is used to identify a PLMN. Correspondingly, step 405 may include: according to the first identifier in the PDUID of the first terminal, the second management and control network element obtains from the NRF network element the identifier of the storage network element in the PLMN corresponding to the first identifier (that is, the storage network element of the first storage network element). Identification); the second management and control network element sends the first message to the first storage network element according to the identification of the first storage network element.

Wherein, the identifier of the storage network element is used to identify a storage network element, and can be specifically the name or address of the storage network element, which is not limited. For example, if the first storage network element is a UDM network element, the identifier of the first storage network element may be FQDN information or IP address information of the UDM network element, etc., which is not limited.

406. The first storage network element receives the first message from the second management and control network element, and sends the identifier of the first management and control network element to the second management and control network element according to the first message and the corresponding relationship.

Based on step 403, it can be seen that the first storage network element stores the correspondence between the PDUID of the first terminal and the identification of the first management and control network element. After receiving the first message carrying the PDUID of the first terminal from the second management and control network element, the first storage network element can determine the identity of the first management and control network element corresponding to the PDUID of the first terminal according to the corresponding relationship, thereby The identifier of the first management and control network element is sent to the second management and control network element.

407. The second management and control network element receives the identifier of the first management and control network element from the first storage network element.

Wherein, after receiving the identifier of the first management and control network element sent by the first storage network element, the second management and control network element may obtain the discovery parameter of the first terminal from the first management and control network element. In this way, the second management and control network element can generate discovery matching parameters based on the discovery parameters of the first terminal, and send the discovery matching parameters to the second terminal, so that the first terminal performs subsequent follow-ups based on the discovery parameters and the second terminal based on the discovery matching parameters. The D2D discovery process.

In this way, in the case where the PLMN where the first terminal is located includes multiple management and control network elements, the second management and control network element obtains the identification of the first management and control network element storing the discovery parameters of the first terminal through the first storage network element.

In the solution shown in FIG. 4, the first management and control network element may register the correspondence between the PDUID of the first terminal and the identification of the first management and control network element in the first storage network element after allocating the PDUID of the first terminal. superior. Therefore, in the case that each PLMN includes multiple management and control network elements, the second management and control network element corresponding to the second terminal can query the PLMN where the first terminal is located according to the PDUID of the first terminal through the first storage network element. Among the plurality of management and control network elements, the identification of the first management and control network element that stores the discovery parameters of the first terminal can further obtain the discovery parameters of the first terminal from the first management and control network element.

This solution can be used to solve the problem that in the 5G network or the future evolved PLMN network, the second management and control network element does not know which management and control network element to obtain the discovery parameters of the first terminal, and the second management and control network element cannot obtain the discovery parameters of the first terminal. The problem.

Referring to FIG. 5A, this application provides yet another communication method, which may be based on the method shown in FIG. 4. After the above steps 402-403, the method further includes steps 408-409, which are specifically as follows.

408. When the validity period of the PDUID of the first terminal expires, the first management and control network element sends a first deletion request message to the first storage network element.

Wherein, the first deletion request message is used to request deletion of the correspondence between the PDUID of the first terminal and the identity of the first management and control network element.

It should be noted that during the validity period of the PDUID of the first terminal, the PDUID of the first terminal is valid, and the correspondence between the PDUID of the first terminal and the identity of the first management and control network element is valid. After the validity period of the PDUID of the first terminal expires, the PDUID of the first terminal becomes invalid, and the corresponding relationship between the PDUID of the first terminal and the identity of the first management and control network element also becomes invalid. The storage network element sends a first deletion request message to request the first storage network element to delete the correspondence between the PDUID of the first terminal and the identifier of the first management and control network element.

409. The first storage network element deletes the correspondence between the PDUID of the first terminal and the identifier of the first management and control network element according to the first deletion request message.

Optionally, the above method further includes: the first management and control network element allocates the validity period of the PDUID, or the first management and control network element receives first indication information, where the first indication information is used to indicate the validity period of the PDUID.

For example, the first management and control network element may determine the validity period of the PDUID of the first terminal according to the subscription information of the first terminal obtained from the UDR network element. Specifically, the subscription information may include the duration of the D2D communication subscription of the first terminal, and the duration may be set as the validity period of the PDUID.

In this way, the correspondence stored by the first storage network element is a valid correspondence, and the PDUID of the first terminal in the correspondence is also a valid user identifier. Not only can the waste of the storage space of the first storage network element be avoided, but also the wrong management and control network element can be found based on the invalid PDUID, and then the wrong discovery parameter can be obtained.

Referring to FIG. 5B, this application provides yet another communication method, which may be based on the method shown in FIG. 4 and used to replace the foregoing steps 408-409. For example, after the foregoing step 403, the method may further include:

410. When the validity period of the PDUID of the first terminal expires, the first storage network element deletes the correspondence between the PDUID of the first terminal and the identity of the first management and control network element.

In an implementation manner, the first information includes first indication information, and the first indication information is used to indicate the validity period of the PDUID of the first terminal.

In another implementation manner, the above method further includes: the first storage network element receives the first indication information.

It is understandable that the first management and control network element may send the first information and the validity period of the PDUID in the same message, or may also send them in different messages, which is not limited in this embodiment of the application.

Wherein, the first indication information includes information such as the effective start and end time or effective duration of the PDUID of the first terminal.

This method can realize that the corresponding relationship saved by the first storage network element is a valid corresponding relationship, and the PDUID of the first terminal in the corresponding relationship is also a valid user identifier. Not only can the waste of the storage space of the first storage network element be avoided, but also the wrong management and control network element can be found based on the invalid PDUID, and then the wrong discovery parameter can be obtained.

In addition, compared with the solutions described in steps 408-409, adopting the solution corresponding to step 410 can reduce the signaling overhead between the first management and control network element and the first storage network element, and reduce the number of interactions between network elements.

It should be noted that, in the embodiment of the present application, after the first management and control network element allocates the PDUID of the first terminal, there may be multiple timings for sending the first information to the first storage network element. That is, the first management and control network element may register with the first storage network element the corresponding relationship between the PDUID of the first terminal and the identification of the first management and control network element at various times.

The following respectively describes different occasions when the first management and control network element sends the first information.

In the first solution, the first management and control network element allocates a PDUID to the first terminal, which can be used as a trigger condition for the first management and control network element to send the first information. That is, after the first management and control network element allocates the PDUID of the first terminal, it sends the first information to the first storage network element.

In this solution, once the first management and control network element obtains the PDUID of the first terminal, it can send the first information to the first storage network element, so as to compare the difference between the PDUID of the first terminal and the identification of the first management and control network element. The corresponding relationship is registered to the first storage network element.

In the second solution, the first management and control network element may also request the server of the first application to authorize the first terminal to perform D2D discovery for the first application. When the first management and control network element receives the authorization response message indicating successful authorization, it sends the first information to the first storage network element.

In this solution, referring to FIG. 6, before step 402, the method may further include:

411. The first management and control network element sends an authorization request message to the server of the first application, where the authorization request message is used to request authorization of the first terminal to perform D2D discovery for the first application.

Correspondingly, the server of the first application receives the authorization request message from the first management and control network element. When the first terminal has subscribed or is authorized to use the D2D communication service for the first application, the server of the first application reports to the first management and control The network element sends an authorization response message to indicate that the first terminal is successfully authorized to perform D2D discovery for the first application.

It should be noted that the D2D communication service subscribed by the first terminal involves multiple proximity service applications. For some specific applications (for example, the first application) of the multiple proximity service applications, whether the first terminal can perform D2D discovery requires authorization from the servers of these specific applications. For example, in step 411, during the D2D discovery process, the first management and control network element may send an authorization request message to the server of the first application to request that the first terminal be authorized to perform D2D discovery for the first application.

412. The first management and control network element receives an authorization response message from the server of the first application, where the authorization response message is used to indicate that the first terminal is successfully authorized to perform D2D discovery for the first application.

After the server of the first application successfully authorizes the first terminal to perform D2D discovery for the first application, the first terminal may perform D2D discovery for the first application. In addition, after the server of the first application successfully authorizes the first terminal to perform D2D discovery for the first application, the first terminal may subsequently perform D2D communication for the first application. It can also be said that the server of the first application successfully authorized the first terminal to perform D2D discovery for the first application, which also means that the server of the first application successfully authorized the first terminal to perform D2D communication for the first application.

If the first management and control network element determines that the first terminal can perform D2D discovery for the first application according to the authorization response message, then the first management and control network element will allocate the discovery parameters of the first terminal, and the first terminal may obtain the discovery parameters. , And enable the second management and control network element to use the correspondence between the PDUID of the first terminal and the identification of the first management and control network element to obtain the discovery parameter of the first terminal. If the authorization response message is used to indicate that the first terminal fails to authorize the D2D discovery for the first application, the first management and control network element will not allocate the discovery parameters of the first terminal, and the first terminal will not obtain the discovery parameters; The management and control network element has registered the corresponding relationship in advance, and the second management and control network element cannot obtain the discovery parameter of the first terminal according to the corresponding relationship. Therefore, the corresponding relationship does not need to be registered in advance.

In the second solution, after determining that the server of the first application has successfully authorized the first terminal to perform D2D discovery for the first application, the first management and control network element registers the PDUID of the first terminal and the first management and control with the first storage network element. The corresponding relationship between the identities of the network elements without registering the corresponding relationship in advance. Assuming that the first management and control network element allocates PDUIDs to N first terminals, and there are M first terminals that receive the authorization response message from the server of the first application, the first management and control network element can register the M first terminals. Correspondence between the PDUID of a terminal and the identity of the first management and control network element. Wherein, N and M are integers, and M is less than or equal to N. Compared with the first solution, the second solution can reduce the signaling overhead and storage resource overhead caused by the correspondence between the PDUIDs of the N-M first terminals and the identification of the first management and control network element.

That is to say, the second solution can avoid problems such as signaling overhead and storage resource overhead caused by registering the corresponding relationship in advance when the first terminal fails to obtain the discovery parameter when the server authorization of the first application fails. .

In the third solution, after receiving the discovery request message sent by the first terminal, the first management and control network element sends the first information to the first storage network element.

Exemplarily, referring to FIG. 6, before step 402, the method may further include:

413. The first management and control network element receives a discovery request message from the first terminal, where the discovery request message is used to request D2D discovery.

Among them, the first management and control network element will allocate the discovery parameters of the first terminal only after receiving the discovery request message from the first terminal. Only then can the first terminal obtain the discovery parameters and make the second management and control network element use the first The corresponding relationship between the PDUID of a terminal and the identification of the first management and control network element obtains the first terminal discovery parameter. If the first terminal has not initiated the discovery request message, the first management and control network element will not allocate the discovery parameters of the first terminal, and the first terminal will not obtain the discovery parameters; even if the first management and control network element has registered the corresponding relationship in advance, The second management and control network element also cannot obtain the discovery parameter of the first terminal according to the corresponding relationship, so the corresponding relationship does not need to be registered in advance.

In the third solution, after receiving the discovery request message from the first terminal, the first management and control network element sends the first information to the first storage network element without registering the corresponding relationship in advance. Assuming that the first management and control network element allocates PDUIDs to N first terminals, and receives discovery request messages from P first terminals, the first management and control network element can register the PDUIDs of the P first terminals and the first terminal. The corresponding relationship between the identifiers of the management and control network elements. Wherein, N and P are integers, and P is less than or equal to N. Compared with the first solution, the third solution can reduce the signaling overhead and storage resource overhead caused by the corresponding relationship between the PDUID of the registered N-P first terminals and the identity of the first management and control network element.

That is to say, adopting the third solution can avoid the signaling overhead and storage resource overhead caused by the first terminal not acquiring the discovery parameters and registering the corresponding relationship in advance when the first terminal has not sent the discovery request message all the time. problem.

It should be noted that there is no clear sequence relationship between the foregoing steps 411-412 and the foregoing step 413, and the execution sequence thereof is not limited in the embodiment of the present application. That is, the first management and control network element may send the authorization request message in step 411 after allocating the PDUID to the first terminal, or it may send the authorization request message in step 411 after receiving the discovery request message initiated by the first terminal. Authorization request message.

In the fourth solution, after the first management and control network element allocates the discovery parameters of the first terminal, the first information is sent to the first storage network element.

Exemplarily, referring to FIG. 6, between step 413 and step 402, the method may further include:

414. The first management and control network element allocates discovery parameters according to the discovery request message.

The discovery request message in step 413 may include the RPAUID of the first terminal for the first application, and the discovery parameter corresponds to the RPAUID.

Specifically, after receiving the RPAUID discovery request message carrying the first terminal for the first application, the first management and control network element may allocate corresponding discovery parameters to the RPAUID.

If the first management and control network element allocates the discovery parameters of the first terminal, it is possible for the first terminal to obtain the discovery parameters and enable the second management and control network element to use one of the PDUID of the first terminal and the identification of the first management and control network element. The corresponding relationship between the two obtains the discovery parameter of the first terminal. If the first management and control network element does not allocate the discovery parameters of the first terminal, the first terminal will not obtain the discovery parameters; even if the first management and control network element has registered the corresponding relationship in advance, the second management and control network element cannot be based on the corresponding relationship. The discovery parameter of the first terminal is acquired, so the corresponding relationship does not need to be registered in advance.

In the fourth solution, after receiving the discovery request message and assigning discovery parameters, the first management and control network element registers the correspondence between the PDUID of the first terminal and the identification of the first management and control network element with the first storage network element , Without registering the corresponding relationship in advance. Assuming that the first management and control network element allocates PDUIDs to N first terminals, and the first management and control network element allocates discovery parameters to Q first terminals, the first management and control network element can register the PDUIDs of the Q first terminals Correspondence with the identity of the first management and control network element. Among them, N and Q are integers, and Q is less than or equal to N. Compared with the first solution, the fourth solution can reduce the signaling overhead and storage resource overhead caused by the correspondence between the PDUID of the registered N-Q first terminals and the identity of the first management and control network element.

Among them, Q is less than or equal to M, and Q is less than or equal to P. When Q is less than M, compared with the second solution, the fourth solution can also reduce the signaling overhead and storage resource overhead caused by registering the corresponding relationship. When Q is less than P, compared with the third solution, the fourth solution can also reduce the signaling overhead and storage resource overhead caused by registering the corresponding relationship.

That is to say, adopting the fourth solution can avoid the signaling overhead caused by registering the corresponding relationship in advance when the first terminal does not obtain the discovery parameters when the first management and control network element does not allocate the discovery parameters of the first terminal. And storage resource overhead.

In the fifth solution, the first management and control network element may not send the first information immediately after allocating the discovery parameters to the first terminal, but send the first information at other times after the discovery parameters are allocated.

Optionally, after the first management and control network element sends a discovery response to the first terminal, the first information is sent to the first storage network element.

Exemplarily, referring to FIG. 6, between step 414 and step 402, the method may further include:

415. The first management and control network element sends a discovery response message to the first terminal, where the discovery response message includes the discovery parameter.

Wherein, after the first management and control network element sends a discovery response message to the first terminal, the first terminal obtains the discovery parameters, and causes the second management and control network element to use the PDUID of the first terminal and the identification of the first management and control network element. The corresponding relationship between the two obtains the first terminal discovery parameter. If the first management and control network element does not send a discovery response message to the first terminal, the first terminal will not obtain the discovery parameters, even if the first management and control network element has registered the corresponding relationship in advance, and the second management and control network element is based on the corresponding relationship If the discovery parameter of the first terminal is acquired, the second terminal cannot discover the first terminal based on the discovery parameter, so the corresponding relationship does not need to be registered in advance.

In the fifth solution, after receiving the discovery request message and sending the discovery response message to the first terminal, the first management and control network element registers the first information with the first storage network element without pre-registering the corresponding relationship. Assuming that the first management and control network element allocates PDUIDs to N first terminals, and the first management and control network element sends a discovery response message to K first terminals, the first management and control network element can register the K first terminals Correspondence between the PDUID and the identity of the first management and control network element. Wherein, N and K are integers, and K is less than or equal to N. Compared with the first solution, the fifth solution can reduce the signaling overhead and storage resource overhead caused by the correspondence between the PDUIDs of the N-K first terminals and the identification of the first management and control network element.

Among them, K is less than or equal to Q. For example, when it is found that the response message fails to be sent, K is less than Q. In this case, compared with the fourth solution, the fifth solution can also reduce the signaling overhead and storage resource overhead caused by registering the corresponding relationship.

That is to say, adopting the fifth solution can avoid problems such as signaling overhead and storage resource overhead caused by registering the corresponding relationship in advance when the first terminal does not obtain the discovery parameter.

It is understandable that the first management and control network element may also send the first information to the first storage network element at other times after the PDUID of the first terminal is assigned. Exemplify.

FIG. 7 shows another communication method provided by an embodiment of the present application, which can be applied to D2D discovery. The communication method may include:

701. The first management and control network element obtains second information, where the second information includes the RPAUID and discovery parameters of the first terminal for the first application, and the discovery parameters are used for D2D discovery.

The first management and control network element may obtain the RPAUID of the first terminal for the first application from the first terminal. For example, the first management and control network element may obtain the RPAUID of the first application from the discovery request message sent by the first terminal.

Optionally, the above method further includes that the first management and control network element allocates discovery parameters to the RPAUID, so that the first terminal and other terminals subsequently perform D2D discovery based on the discovery parameters.

702. The first management and control network element sends second information to the first storage network element, where the second information is used by the first storage network element to store the correspondence between the RPAUID and the discovery parameter.

Specifically, the first management and control network element may send the RPAUID and the discovery parameter of the first terminal for the first application to the first storage network element, so that the first storage network element stores the correspondence between the RPAUID and the discovery parameter. In this way, the management and control network elements corresponding to other terminals can obtain corresponding discovery parameters from the first storage network element according to the RPAUID.

Wherein, the first storage network element is a storage network element in the PLMN where the first terminal is located. For example, the first storage network element may be the aforementioned UDM network element, UDR network element, or BSF network element, etc., or may be a newly-added network element.

703. The first storage network element receives the second information from the first management and control network element, and stores the corresponding relationship between the RPAUID and the discovery parameter.

Through the above steps 702-703, the first storage network element stores the correspondence between the RPAUID of the first terminal for the first application and the discovery parameter. It can also be said that the first management and control network element compares the correspondence between RPAUID and the discovery parameter Register to the first storage network element. Further, the first storage network element may provide the discovery parameter corresponding to the RPAUID to the management and control network elements of other terminals according to the corresponding relationship.

704. The second management and control network element receives the target PDUID of the second terminal from the server of the first application, where the target PDUID includes the PDUID of the first terminal.

Wherein, the target PDUID may include the PDUID of one or more terminals to be monitored/discovered of the second terminal, and the one or more terminals to be monitored/discovered include the first terminal. In other words, the target PDUID includes the first terminal. The PDUID of the terminal. For the relevant description of the second management and control network element receiving the target PDUID of the second terminal from the server of the first application, refer to the foregoing step 404, which will not be repeated here.

The following will describe how the second management and control network element obtains the discovery parameter of the first terminal according to the PDUID of the first terminal as an example. For each of the other PDUIDs in the target PDUID, the second management and control network element can obtain the corresponding discovery parameters of the terminal to be monitored/to be discovered in a similar manner. It can be understood that the above method may also include the following steps.

705. The second management and control network element sends a second message to the first storage network element according to the PDUID of the first terminal. The second message includes the RPAUID of the first terminal for the first application, and the second message is used to obtain the RPAUID corresponding to the RPAUID. Found parameters.

Specifically, the second management and control network element may determine the first storage network element according to the PDUID of the first terminal, so as to send a second message to the first storage network element to request to obtain the discovery parameter corresponding to the RPAUID.

Wherein, the PDUID of the first terminal includes a first identifier, and the first identifier is an identifier of the PLMN where the first terminal is located, that is, it is used to identify a PLMN. Correspondingly, step 705 may include: according to the first identifier in the PDUID of the first terminal, the second management and control network element obtains the identifier of the storage network element in the PLMN corresponding to the first identifier from the NRF network element (that is, the identifier of the first storage network element). Identification); the second management and control network element sends a second message to the first storage network element according to the identification of the first storage network element. For the description of the identification of the first storage network element, reference may be made to the relevant description in step 405 above.

706. The first storage network element receives the second message from the second management and control network element, and sends the discovery parameter to the second management and control network element according to the second message and the corresponding relationship.

Based on step 703, it can be seen that the first storage network element stores the corresponding relationship between the RPAUID of the first terminal for the first application and the discovery parameter. After receiving the second message carrying the RPAUID sent by the second management and control network element, the first storage network element may determine the discovery parameter corresponding to the RPAUID according to the corresponding relationship, and thereby send the discovery parameter to the second management and control network element.

707. The second management and control network element receives the discovery parameter from the first storage network element.

Wherein, after receiving the discovery parameter from the first storage network element, the second management and control network element may generate the discovery matching parameter according to the discovery parameter of the first terminal, and send the discovery matching parameter to the second terminal, so that the first terminal Based on the discovery parameters and the second terminal performs the subsequent D2D discovery process based on the discovery matching parameters.

In this way, when the PLMN where the first terminal is located includes multiple management and control network elements, the second management and control network element can directly obtain the discovery parameters of the first terminal from the first storage network element without going to the first management and control network element. Obtaining the discovery parameters can solve the problem that the second management and control network element does not know which management and control network element in the PLMN where the first terminal is located to obtain the discovery parameters.

In the solution shown in FIG. 7, the first management and control network element may register the correspondence between the RPAUID of the first terminal for the first application and the discovery parameter on the first storage network element. The second management and control network element corresponding to the second terminal can determine the first storage network element according to the PDUID of the first terminal, and directly obtain the discovery parameter corresponding to the RPAUID from the first storage network element, which can solve the problem that the second management and control network element does not know the direction to the first storage network element. The problem of which management and control network element in the PLMN where a terminal is located obtains the discovery parameters of the first terminal, and the second management and control network element cannot obtain the discovery parameters of the first terminal.

In addition, in the solution shown in FIG. 7, the second management and control network element can directly obtain the discovery parameters of the first terminal through the first storage network element, and there is no need to go to the first management and control network element to obtain the discovery parameters. The signaling overhead between the first management and control network element and the second management and control network element is reduced, the number of interactions between devices is reduced, the processing delay is reduced, and the processing efficiency is improved.

Referring to FIG. 8A, this application provides yet another communication method, which may be based on the method shown in FIG. 7. For example, after the above steps 702-703, the method may further include:

708. When the validity period of the discovery parameter expires, the first management and control network element sends a second deletion request message to the first storage network element.

Wherein, the second deletion request message is used to request to delete the correspondence between the RPAUID and the discovery parameter.

It should be noted that within the validity period of the discovery parameter, the discovery parameter is valid, and the corresponding relationship between the RPAUID and the discovery parameter is valid. After the validity period of the discovery parameter expires, the discovery parameter becomes invalid, and the corresponding relationship between the RPAUID and the discovery parameter becomes invalid. Therefore, the first management and control network element can send a second deletion request message to the first storage network element to request deletion of RPAUID and Find the correspondence between the parameters.

709. After receiving the second deletion request message from the first management and control network element, the first storage network element deletes the correspondence between the RPAUID and the discovery parameter according to the second deletion request message.

Optionally, the above method further includes: the first management and control network element allocates the validity period of the discovery parameter, or the first management and control network element receives second indication information, and the second indication information is used to indicate the validity period of the discovery parameter.

For example, the first management and control network element may determine the validity period of the first terminal discovery parameter according to the subscription information of the first terminal obtained from the UDR network element. Specifically, the subscription information may include the duration for the first terminal to subscribe to the D2D communication for the first application, and the duration may be set as the validity period of the discovery parameter.

In this way, the corresponding relationship saved by the first storage network element is a valid corresponding relationship, and the discovery parameter in the corresponding relationship is a valid discovery parameter. Not only can the waste of the storage space of the first storage network element be avoided, but also the invalid discovery parameters can be avoided.

Referring to Fig. 8B, this application provides yet another communication method, which can be based on the method shown in Fig. 7 to replace the above steps 708-709. For example, after the above step 703, the method may further include:

710. When the validity period of the discovery parameter expires, the first storage network element deletes the correspondence between the RPAUID and the discovery parameter.

In an implementation manner, the second information includes second indication information, and the second indication information is used to indicate the validity period of the discovery parameter.

In another implementation manner, the above method further includes: the first storage network element receives the second indication information.

It is understandable that the first management and control network element may send the second information and the validity period of the discovery parameter in the same message, or may also send them in different messages, which is not limited in this embodiment of the application.

Wherein, the second indication information includes information such as the effective start and end time or effective duration of the discovery parameter.

This method can realize that the corresponding relationship saved by the first storage network element is the effective corresponding relationship, and the discovery parameter in the corresponding relationship is the effective discovery parameter. Not only can the waste of the storage space of the first storage network element be avoided, but also the invalid discovery parameters can be avoided.

In addition, compared with the solutions described in steps 708-709, adopting the solution corresponding to step 710 can reduce the signaling overhead between the first management and control network element and the first storage network element, and reduce the number of interactions between network elements.

It should be noted that the first management and control network element and the second management and control network element respectively corresponding to the first terminal and the second terminal may be the same or different.

In some embodiments, after obtaining the target PDUID, the second management and control network element executes the above-mentioned process, and obtains the discovery parameters of the terminal to be monitored/discovered through the storage network element. Regardless of whether the first managed network element is the same as the second managed network element.

In other embodiments, after the second management and control network element obtains the target PDUID, if it is determined that the PDUID of the first terminal in the target PDUID is not allocated by the second management and control network element, that is, the second management and control network element and the first management and control network element If the second management and control network element is different, the second management and control network element executes the communication process described in the above embodiment, and uses the first storage network element to obtain the discovery parameters of the first terminal; if the PDUID of the first terminal is allocated by the second management and control network element, that is, the second The management and control network element is the same as the first management and control network element, and the second management and control network element stores the discovery parameters of the first terminal, and the second management and control network element obtains the discovery parameters of the first terminal from itself.

Exemplarily, when the D2D communication system is combined with the 5G network system, a schematic diagram of an architecture of the D2D communication system can be seen in FIG. 9A. The management and control network element shown in FIG. 2A may be the PCF network element shown in FIG. 9A, and the storage network element shown in FIG. 2A may be the UDM shown in FIG. 9A.

When the D2D communication system is combined with the 5G network system, FIG. 9B shows another schematic diagram of the architecture of the D2D communication system. As shown in FIG. 9B, the D2D communication system includes a first terminal, a second terminal, a first (R)AN device accessed by the first terminal, a first AMF network element accessed by the first terminal, and a corresponding The first PCF network element, the first UDM network element in the PLMN where the first terminal is located, the second (R)AN device that the second terminal accesses, the second AMF network element that the second terminal accesses, and the second terminal corresponds to The second PCF network element, UDR network element and the first application server and other equipment. The first (R)AN device and the second (R)AN device may be the same or different, and the first AMF network element and the second AMF network element may be the same or different.

The following describes the communication method provided in the embodiment of the present application based on the D2D communication system shown in FIG. 9B, taking the discovery process corresponding to mode A as an example.

It should be noted that the embodiment of the present application is not limited to a D2D communication system combined with a 5G network, and can also be applied to a D2D communication system combined with other communication systems that will evolve in the future (for example, a 6G network system). In addition, the names of the various network elements used in the embodiments of the present application may remain the same in function when combined with a future communication system, but the names will be changed.

Exemplarily, based on the D2D communication system shown in FIG. 9B, an embodiment of the present application provides a communication method. As shown in FIG. 10, the method may include the following main processes:

1001. The first terminal obtains discovery parameters.

1002. The second terminal obtains the discovery matching parameter.

1003. The first terminal broadcasts the discovery parameter.

1004. The second terminal monitors the broadcast message, and determines to discover the first terminal according to the discovery parameter and the discovery matching parameter.

1005. The first terminal establishes a D2D communication link with the second terminal, and performs D2D communication.

Each of the above steps 1001-1005 will be described separately.

Referring to FIG. 11, the above step 1001 may include the following steps 1101-1117:

1101. The first terminal registers with the network through the first (R)AN device and the first AMF network element.

1102. The first AMF network element selects the first PCF network element for the first terminal.

1103. The first PCF network element allocates PDUID1 and the validity period of PDUID1 to the first terminal.

The conditions for the first PCF network element to allocate PDUID1 to the first terminal may refer to the condition 1 and the condition 2 in step 401 above. After allocating PDUID1, the first PCF network element may send PDUID1 to the first terminal.

This step 1103 may correspond to the above step 401.

In step 1103, the first PCF network element allocates the validity period of PDUID1. In other implementation manners, the first PCF network element receives first indication information from the UDR network element or other network elements, and the first indication information is used to indicate the validity period of the PDUID.

1104. The first PCF network element sends first information to the first UDM network element, where the first information includes PDUID1 and the identification of the first PCF network element, and the first information is used by the first UDM network element to store PDUID1 and the first PCF network element. Correspondence between the identities of the meta.

Wherein, the first UDM network element is the UDM network element in the PLMN where the first terminal is located, and corresponds to the identity of the PLMN.

This step 1104 may correspond to the above step 402.

1105. The first UDM network element stores the correspondence between the PDUID1 and the identity of the first PCF network element.

This step 1105 may correspond to the above step 403.

In an implementation manner, the method may further include:

1106. When the validity period of the PDUID1 expires, the first PCF network element sends a first deletion request message to the first UDM network element.

Wherein, the first deletion request message is used to request deletion of the correspondence between PDUID1 and the identity of the first PCF network element.

1107. The first UDM network element receives the first deletion request message from the first PCF network element, and deletes the correspondence between PDUID1 and the identity of the first PCF network element according to the first deletion request message.

The steps 1106-1107 may correspond to the above steps 408-409.

In another implementation manner, the above steps 1106-1107 can be replaced with step 1108:

1108. When the validity period of the PDUID1 expires, the first UDM network element deletes the correspondence between the PDUID1 and the identity of the first PCF network element.

Optionally, the first UDM network element receives first indication information from the first PCF network element, where the first indication information is used to indicate the validity period of the PDUID.

It is understandable that the first PCF network element may send the first information and the validity period of the PDUID in the same message, or may also send them in different messages, which is not limited in this embodiment of the application.

This step 1108 may correspond to the above step 410.

In addition, compared with the solution described in steps 1106-1107, adopting the solution corresponding to step 1108 can reduce the signaling overhead between the first PCF network element and the first UDM network element, and reduce the number of interactions between network elements.

Further, the method may also include:

1109. The first terminal sends PDUID1 to the server of the first application.

1110. The server of the first application allocates RPAUID1 to PDUID1 for the first application, and stores the correspondence between PDUID1 and RPAUID1.

Wherein, the RPAUID1 is the RPAUID of the first terminal for the first application. The server of the first application may also send the allocated RPAUID1 to the first terminal.

1111. The first terminal sends a discovery request message to the first PCF network element, where the discovery request message is used to request D2D discovery, and the discovery request message includes RPAUID1.

Wherein, when the first terminal wants to perform D2D communication or wants to be discovered by D2D, it may send a discovery request message to the first PCF network element.

In addition, the discovery request message may also include information such as the discovery type, the identification of the first terminal (for example, the international mobile subscriber identity (IMSI)), or the identification of the first application. For example, the discovery type is restricted discover.

Wherein, after the first terminal is registered to the network in the above step 1101, it can subscribe to the D2D communication service, and the corresponding subscription information can be stored on the UDR network element. After the first AMF network element selects the first PCF network element for the first terminal in the above step 1102, the first PCF network element may obtain the subscription information of the first terminal on the D2D communication service from the UDR network element, or not from the UDR The network element obtains the subscription information of the first terminal regarding the D2D communication service.

Further, the method may further include step 1112 or step 1113:

1112. If the first PCF network element determines that it includes the subscription information of the first terminal for the D2D communication service, and the subscription information is used to indicate that the first terminal is allowed to perform D2D discovery, continue to perform step 1114 and subsequent processes.

1113. If the first PCF network element determines that the first terminal's subscription information for the D2D communication service is not included, the first PCF network element obtains the subscription information from the UDR network element, and the subscription information is used to instruct the first terminal to allow D2D discovery , Then continue to perform step 1114 and subsequent processes.

Optionally, the method may further include:

1114. The first PCF network element sends an authorization request message to the server of the first application, where the authorization request message is used to request authorization of the first terminal to perform D2D discovery for the first application.

Wherein, the authorization request message may include information such as RPAUID1 or discovery type. For example, the discovery type is restricted discovery.

1115. The first PCF network element receives an authorization response message from the server of the first application, where the authorization response message is used to indicate that the first terminal is successfully authorized to perform D2D discovery for the first application.

Wherein, the authorization response message may include information such as PDUID1.

1116. The first PCF network element allocates the discovery parameter and the validity period of the discovery parameter to RPAUID1, and stores the correspondence between RPAUID1 and the discovery parameter, and the discovery parameter is used for D2D discovery.

For example, the discovery parameter may include ProSe Restricted Code (ProSe Restricted Code).

1117. The first PCF network element sends a discovery response message to the first terminal, where the discovery response message includes the discovery parameter and the validity period of the discovery parameter.

So far, the first terminal has obtained the discovery parameter corresponding to RPAUID1.

Referring to FIG. 11, the above step 1002 may include the following steps 1118-1135:

1118. The second terminal registers with the network through the second (R)AN device and the second AMF network element.

1119. The second AMF network element selects the second PCF network element for the second terminal.

1120. The second PCF network element allocates PDUID2 and the validity period of PDUID2 to the second terminal.

After the second PCF network element allocates PDUID2, it may send PDUID2 to the first terminal.

1121. The second terminal sends PDUID2 to the server of the first application.

1122. The server of the first application allocates RPAUID2 to PDUID2 for the first application, and stores the correspondence between PDUID2 and RPAUID2.

Wherein, the RPAUID2 is the RPAUID of the second terminal for the first application. The server of the first application may also send the allocated RPAUID2 to the second terminal.

1123. The second terminal obtains a target RPAUID, where the target RPAUID includes RPAUID1.

For example, the second terminal may obtain the target RPAUID from the server of the first application, or obtain the target RPAUID from the local application layer of the second terminal.

The target RPAUID may include the RPAUID of one or more terminals to be monitored for the first application, including the RPAUID of the first terminal for the first application, that is, RPAUID1.

1124. The second terminal sends a discovery request message to the second PCF network element, where the discovery request message is used to request D2D discovery, and the discovery request message includes the target RPAUID.

Wherein, the target RPAUID includes RPAUID1. In addition, the discovery request message may also include information such as RPAUID2, discovery type, identification of the second terminal, or identification of the first application. For example, the discovery type is restricted discovery.

Further, the method may further include step 1125 or step 1126:

1125. If the second PCF network element includes the subscription information of the second terminal on the D2D communication service, and the subscription information is used to indicate that the second terminal can perform D2D discovery, continue to perform step 1127 and subsequent processes.

1126. If the second PCF network element does not include the subscription information of the second terminal for the D2D communication service, the first PCF network element obtains the subscription information from the UDR network element, and the subscription information is used to indicate that the second terminal can perform D2D discovery. Then continue to perform step 1127 and subsequent processes.

Further, the method may further include steps 1127-1128:

1127. The second PCF network element sends an authorization request message to the server of the first application, where the authorization request message is used to request authorization of the second terminal to perform D2D discovery for the first application.

Wherein, the authorization request message may include information such as target RPAUID, RPAUID2, or discovery type. For example, the discovery type is restricted discovery.

1128. The second PCF network element receives an authorization response message from the server of the first application, where the authorization response message is used to indicate that the second terminal is successfully authorized to perform D2D discovery for the first application.

The authorization response message includes PDUID2 and the corresponding relationship between each target RPAUID and target PDUID, including the corresponding relationship between RPAUID1 and PDUID1.

That is, the second PCF network element receives the target PDUID of the second terminal from the server of the first application, and the target PDUID includes the PDUID of the first terminal.

This step 1128 may correspond to the above step 404.

1129. The second PCF network element determines the first UDM network element according to the PLMN identifier in PDUID1.

Among them, the UDM network element corresponding to the PLMN identifier in PDUID1 is the first UDM network element.

1130. The second PCF network element sends a first message to the first UDM network element, where the first message includes PDUID1, and the first message is used to obtain an identifier of the first PCF network element that stores the discovery parameter of the first terminal.

The steps 1129-1130 may correspond to the above step 405.

1131. The first UDM network element receives the first message from the second PCF network element, and sends the identification of the first PCF network element corresponding to PDUID1 to the second PCF network element according to the first message and the corresponding relationship.

This step 1131 may correspond to the above step 406.

1132. The second PCF network element receives the identifier of the first PCF network element from the first UDM network element, and sends a parameter request message to the first PCF network element, the parameter request message includes RPAUID1, and the parameter request message is used to obtain RPAUID1 Corresponding discovery parameters.

Optionally, the parameter request message may also include information such as PDUID1.

1133. The first PCF network element receives the parameter request message from the first UDM network element, and sends the discovery parameter to the second PCF network element according to the parameter request message and the correspondence between RPAUID1 and the discovery parameter.

1134. The second PCF network element receives the discovery parameter from the first PCF network element, and generates a discovery matching parameter according to the discovery parameter.

Wherein, the second PCF network element may obtain the discovery parameters corresponding to each target RPAUID (including RPAUID1). The second PCF network element may generate the discovery matching parameter according to the discovery parameter and the validity period of the discovery parameter respectively corresponding to each target RPAUID. For example, the discovery matching parameters include the discovery parameters corresponding to each target RPAUID, and the minimum value in the validity period of these discovery parameters.

1135. The second PCF network element sends a discovery response message to the second terminal, where the discovery response information includes discovery matching parameters.

So far, the second terminal has obtained the discovery matching parameter.

Referring to FIG. 11, the above step 1003 may include step 1136:

1136. The first terminal broadcasts the discovery parameter corresponding to RPAUID1.

Among them, there may be multiple ways for the first terminal to broadcast the discovery parameter. For example, in one manner, after acquiring the discovery parameter, the first terminal may continue to broadcast the discovery parameter until it is discovered by other terminals.

For another example, in another manner, after the first terminal obtains the discovery parameter, it temporarily does not broadcast the discovery parameter, and the first PCF network element determines that there is Other terminals want to monitor the first terminal, so they can notify the first terminal, and the first terminal broadcasts the discovery parameter at this time. Compared with the previous method, this method can save the broadcast overhead of discovering parameters.

Referring to FIG. 11, the foregoing step 1004 may include:

1137. After listening to the discovery parameter broadcast by the first terminal, the second terminal determines that the discovery parameter matches the discovery matching parameter.

Optionally, the second terminal may also send the discovery parameter of the first terminal to the second PCF network element, so as to learn the identity of the first terminal from the second PCF network element.

So far, the second terminal successfully discovers the first terminal.

Referring to FIG. 11, the foregoing step 1005 may include:

1138. The first terminal and the second terminal establish a D2D communication link based on the PC5 interface, and perform D2D communication.

In the solution described in steps 1101-1138, the first PCF network element corresponding to the first terminal may register the correspondence between PDUID1 and the identity of the first PCF network element in the first UDM after allocating PDUID1 to the first terminal On the network element. Therefore, in the case that each PLMN includes multiple PCF network elements, the second PCF network element corresponding to the second terminal can query the multiple PCFs included in the PLMN where the first terminal is located through the first UDM network element according to PDUID1. In the network element, the identification of the first PCF network element that stores the discovery parameters of the first terminal can then obtain the discovery parameters of the first terminal from the first PCF network element; it does not appear that the second PCF network element does not know to which direction. The PCF network element obtains the discovery parameter of the first terminal, and the second PCF network element cannot obtain the discovery parameter of the first terminal. In addition, the second PCF network element may also generate a discovery matching parameter according to the discovery parameter of the first terminal. The first terminal and the second terminal respectively discover each other based on the discovery parameter and the discovery matching parameter, and then establish a D2D communication link for communication.

It should be noted that in the above steps 1101-1138, the sequence of some steps can be changed. For example, steps 1114-1115 can be executed first, and then step 1111 can be executed, which will not be listed here.

It should also be noted that, after the first PCF network element allocates PDUID1 to the first terminal, there may be multiple opportunities for the first PCF network element to send the first information to the first UDM network element, which is not limited in this embodiment of the application. For example, the above steps 1104-1108 may be after step 1103; or, the above steps 1104-1108 may be after the above step 1111; or, the above steps 1104-1108 may be after the above step 1115; or, the above steps 1104-1108 may be after After the above step 1116; or, the above steps 1104-1108 may be after the above step 1107.

Based on the D2D communication system shown in FIG. 9B, FIG. 12 shows another communication method provided by an embodiment of the present application. The method may include steps 1101-1103 and steps 1109-1129.

And, after step 1116, the method may further include steps 1200-1201:

1200. The first PCF network element sends second information to the first UDM network element, where the second information is used by the first UDM network element to save the correspondence between RPAUID1 and the discovery parameter.

1201. The first UDM network element stores the correspondence between RPAUID1 and the discovery parameter.

Further, after step 1201, the method may further include steps 1202-1203:

1202. When the validity period of the discovery parameter expires, the first PCF network element sends a second deletion request message to the first UDM network element.

Wherein, the second deletion request message is used to request deletion of the correspondence between RPAUID1 and the discovery parameter.

1203. The first UDM network element receives the second deletion request message from the first PCF network element, and deletes the correspondence between RPAUID1 and the discovery parameter according to the second deletion request message.

Optionally, the method further includes: the first PCF network element allocates the validity period of the discovery parameter, or the first PCF network element receives second indication information, where the second indication information is used to indicate the validity period of the discovery parameter.

As an alternative to the above steps 1202-1203, after step 1201, the method may further include:

1204. When the validity period of the discovery parameter expires, the first UDM network element deletes the correspondence between RPAUID1 and the discovery parameter.

In another implementation manner, the above method further includes: the first UDM network element receives the second indication information. For example, the second information includes second indication information, and the second indication information is used to indicate the validity period of the discovery parameter.

It is understandable that the first PCF network element may send the second information and the validity period of the discovery parameter in the same message, or may also send them in different messages, which is not limited in this embodiment of the application.

After the above step 1129, the method may further include:

1205. The second PCF network element sends a parameter request message to the first UDM network element, where the parameter request message includes RPAUID1, and the parameter request message is used to obtain the discovery parameter corresponding to RPAUID1.

1206. The first UDM network element receives the parameter request message from the second PCF network element, and sends the discovery parameter to the second PCF network element according to the correspondence between RPAUID1 and the discovery parameter.

After step 1206, the method may further include the above-mentioned steps 1134-1138.

In the solution shown in FIG. 12, the first PCF network element corresponding to the first terminal may register the correspondence between RPAUID1 and the discovery parameter on the first UDM network element. The second PCF network element corresponding to the second terminal can determine the first UDM network element according to PDUID1, and directly obtain the discovery parameter corresponding to RPAUID1 from the first UDM network element, which can solve the problem that the second PCF network element does not know the PLMN where the first terminal is located. Which PCF network element in the network element obtains the discovery parameter of the first terminal, and the second PCF network element cannot obtain the discovery parameter of the first terminal.

Moreover, in the solution shown in FIG. 12, the second PCF network element can directly obtain the discovery parameters of the first terminal through the first UDM network element, without the need to go to the first PCF network element to obtain the discovery parameters, which can also reduce The signaling overhead between the first PCF network element and the second PCF network element reduces the number of interactions between devices, reduces processing delay, and improves processing efficiency.

The D2D communication process shown in FIG. 11-12 is explained by using mode A for restricted discovery as an example. Restricted discovery using mode B is similar to restricted discovery using mode A, except that the discovery parameters in mode B include ProSe Query Filter and ProSe Response Code. The discovery matching parameters generated according to the discovery parameters in mode B include ProSe Query Code and ProSe Response Filter. The process corresponding to steps 1136-1137 in Figure 11 and Figure 12 above can be replaced with: the second terminal broadcasts the ProSe Query Code in the found matching parameter, and the first terminal receives the ProSe Query Code and determines that it can match the ProSe Query Code in the discovery parameter. After the Query Filter is matched, it broadcasts the ProSe Response Code in the discovery parameter; the second terminal receives the ProSe Response Code and determines the ProSe Response Filter in the found matching parameter. The second terminal may report the discovery parameter to the second PCF network element to obtain the identity of the first terminal. The second terminal and the first terminal execute the subsequent D2D communication connection process.

In addition, other embodiments of the present application also provide a communication method. The PDUID of the first terminal may include indication information of the identification of the first management and control network element, and the first management and control network element stores the RPAUID of the first terminal for the first application. The corresponding discovery parameter. The second management and control network element may directly obtain the discovery parameter corresponding to the RPAUID from the first management and control network element according to the identification of the first management and control network element indicated by the indication information in the PDUID of the first terminal in the target PDUID, so that the first management and control network The element does not need to register the first information or the second information to the first storage network element, and the first storage network element does not need to provide the identification of the first management network element to the second management and control network element, thus saving the first management and control network element, The signaling overhead between the second management and control network element and the first storage network element reduces the number of interactions between the network elements.

The foregoing mainly introduces the solutions provided by the embodiments of the present application from the perspective of interaction between various network elements. It can be understood that, in order to realize the above functions, the first management and control network element, the second management and control network element, or the first storage network element includes hardware structures and/or software modules corresponding to each function. Those skilled in the art should easily realize that in combination with the units and algorithm steps of the examples described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

The embodiment of the present application can divide the functional modules of the first management and control network element, the second management and control network element, or the first storage network element according to the foregoing method examples. For example, each functional module can be divided corresponding to each function, or two or More than two functions are integrated in one processing module. The above-mentioned integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.

The above mainly describes the method in the embodiment of the present application, and the communication device provided in the embodiment of the present application for performing the foregoing method is described below. Those skilled in the art can understand that the method and the device can be combined and referenced with each other. The communication device provided in the embodiment of the present application can execute the above-mentioned communication method performed by the first management and control network element, the second management and control network element, or the first storage network element. step.

For example, in the case of dividing various functional modules in an integrated manner, FIG. 13 shows a schematic structural diagram of a communication device 130. The communication device 130 includes a processing module 1301 and a transceiver module 1302.

In some embodiments, the communication device 130 is the first management and control network element or is located on the first management and control network element, and the processing module 1301 is configured to: allocate the proximity discovery user equipment identification PDUID to the first terminal through the transceiver module 1302; The module 1302 sends first information to the first storage network element. The first information includes the PDUID of the first terminal and the identification of the first management and control network element. The first information is used by the first storage network element to store the PDUID and the first terminal of the first terminal. 1. Correspondence between the identifiers of the management and control network elements. Wherein, the first management and control network element stores the discovery parameter of the first terminal, and the discovery parameter is used for D2D discovery.

Wherein, the processing module 1301 can be used to support the communication device 130 to perform steps 401 and 414 shown in FIGS. 4 to 6 in the above-mentioned embodiment; and step 1103, step 1112, step 1113, and step 1116 shown in FIG. 11; and /Or other steps or functions performed by the first management and control network element or the first PCF network element in the above method embodiments.

The transceiver module 1302 can be used to support the communication device 130 to perform steps 402, 408, 411, 412, 413, and 415 shown in FIG. 4 to FIG. 6 in the foregoing embodiment; and step 1104, step 415 shown in FIG. Step 1106, step 1114, step 1117, and step 1133; and/or other steps or functions performed by the first management and control network element or the first PCF network element in the above method embodiments.

Among them, all relevant content of the steps involved in the above method embodiments can be cited in the functional description of the corresponding functional module, which will not be repeated here.

In some embodiments, the communication device 130 is a second management and control network element or is located on a second management and control network element, and the processing module 1301 may be configured to: receive the target proximity discovery of the second terminal from the server of the first application through the transceiver module 1302 The user equipment identification PDUID, the target PDUID includes the PDUID of the first terminal; the transceiver module 1302 sends the first message to the first storage network element according to the PDUID of the first terminal, and the first message includes the PDUID of the first terminal. To obtain the identification of the management and control network element storing the discovery parameters of the first terminal; receive the identification of the first management and control network element from the first storage network element through the transceiver module 1302, and the first management and control network element stores the discovery parameters of the first terminal.

The processing module 1301 can be used to support the communication device 130 to perform step 1120, step 1125, step 1126, step 1129, and step 1134 shown in FIG. 11 in the foregoing embodiment; and/or the second management and control network element in the foregoing method embodiment And other actions or functions performed by the second PCF network element.

The transceiver module 1302 can be used to support the communication device 130 to perform step 404, step 405, and step 407 shown in FIG. 4 to FIG. 6; step 1127, step 1130, step 1132, and step 1135 shown in FIG. 11; And/or other actions or functions performed by the second management and control network element or the second PCF network element in the above method embodiments.

In some embodiments, the communication device 130 is the first storage network element or is located on the first storage network element, and the processing module 1301 may be configured to: receive the first information from the first management and control network element through the transceiver module 1302, The information includes the proximity discovery user equipment identification PDUID of the first terminal and the identification of the first management and control network element; the corresponding relationship between the PDUID of the first terminal and the identification of the first management and control network element is stored; The first message of the network element, the first message includes the PDUID of the first terminal, and the first message is used to obtain the identification of the management and control network element corresponding to the PDUID of the first terminal; Second, the management and control network element sends the identifier of the first management and control network element.

Wherein, the processing module 1301 can be used to support the communication device 130 to perform steps 403, 409, and 410 shown in FIGS. 4-6 in the foregoing embodiment; step 1105, step 1107, and step 1108 shown in FIG. 11; and/or Other actions or functions performed by the first storage network element and the first UDM network element in the above method embodiments.

The transceiver module 1302 can be used to support the communication device 130 to perform step 406 shown in FIG. 4 to FIG. 6, step 1131 in FIG. 11, and/or the first storage network element and the first storage network element in the above method embodiments. Other actions or functions performed by UDM network elements.

In other embodiments, the communication device 130 is the first management and control network element or is located on the first management and control network element, and the processing module 1301 can be used to: Restricted proximity application user identification RPAUID and discovery parameters, the discovery parameters are used for D2D discovery; the second information is sent to the first storage network element through the transceiver module 1302, and the second information is used for the first storage network element to save the RPAUID and the discovery parameters Correspondence between.

Wherein, the processing module 1301 can be used to support the communication device 130 to perform step 701, step 1103, step 1112, step 1113, and step 1116 shown in FIG. 7-8 in the above-mentioned embodiment; and/or implementation of the above method In the example, other actions or functions performed by the first management and control network element or the first PCF network element.

The transceiver module 1302 can be used to support the communication device 130 to perform steps 702 and 708 shown in FIGS. 7-8 in the above-mentioned embodiment; step 1114, step 1117, step 1200, and step 1202 shown in FIG. 12; and/or above Other actions or functions performed by the first management and control network element or the first PCF network element in the method embodiment.

In other embodiments, the communication device 130 is a second management and control network element or is located on a second management and control network element, and the processing module 1301 may be configured to: receive the target proximity of the second terminal from the server of the first application through the transceiver module 1302 It is found that the user equipment identification PDUID, the target PDUID includes the PDUID of the first terminal; according to the PDUID of the first terminal, a second message is sent to the first storage network element through the transceiver module 1302, and the second message includes the first terminal’s acceptance of the first application. The user identification RPAUID is limited to the adjacent application, and the second message is used to obtain the discovery parameter corresponding to the RPAUID; the discovery parameter is received from the first storage network element through the transceiver module 1302, and the discovery parameter is used for D2D discovery.

Wherein, the processing module 1301 can be used to support the communication device 130 to perform step 1120, step 1125, step 1126, step 1129, and step 1134 shown in FIG. 12 in the above embodiment; and/or the second management and control network element in the above method embodiment Or other actions or functions performed by the second PCF network element.

The transceiver module 1302 can be used to support the communication device 130 to perform steps 704 and 707 shown in FIGS. 7 to 8 in the foregoing embodiment; step 1205, step 1127, and step 1135 shown in FIG. 12; and/or the above method embodiments Other actions or functions performed by the second management and control network element or the second PCF network element.

In other embodiments, the communication device 130 is a first storage network element or is located on a first management and control network element, and the processing module 1301 may be used to: receive the second information from the first management and control network element through the transceiver module 1302, The second information includes the restricted proximity application user identification RPAUID and discovery parameters of the first terminal for the first application. The discovery parameters are used for D2D discovery; the corresponding relationship between RPAUID and discovery parameters is stored; The second message of the element, the second message includes the RPAUID, and the second message is used to obtain the discovery parameter corresponding to the RPAUID; according to the second message and the corresponding relationship, the discovery parameter is sent to the second management and control network element through the transceiver module 1302.

Wherein, the processing module 1301 can be used to support the communication device 130 to perform steps 703, 709, and 710 shown in FIGS. 7-8 in the above-mentioned embodiment; step 1201, step 1203, and step 1204 shown in FIG. 12; and/ Or other actions or functions performed by the first storage network element or the first UDM network element in the above method embodiments.

The transceiver module 1302 can be used to support the communication device 130 to perform step 706 shown in FIG. 7 to FIG. 8; step 1206 shown in FIG. 12; and/or the first storage network element or the first storage network element in the above method embodiments. Other actions or functions performed by UDM network elements.

In the embodiment of the present application, the communication device 130 is presented in the form of dividing various functional modules in an integrated manner. The "module" here can refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuit, and/or other devices that can provide the above-mentioned functions. In a simple embodiment, those skilled in the art can imagine that the communication device 130 may adopt the form shown in FIG. 3.

For example, the processor 301 in FIG. 3 may call the computer instructions stored in the memory 303 to cause the communication device 130 to execute the actions performed by the first management and control network element or the first PCF network element in the foregoing method embodiment.

For another example, the processor 301 in FIG. 3 may invoke the computer instructions stored in the memory 303 to cause the communication device 130 to execute the actions performed by the second management and control network element or the second PCF network element in the foregoing method embodiment.

For another example, the processor 301 in FIG. 3 may call the computer instructions stored in the memory 303 to cause the communication device 130 to execute the actions performed by the first storage network element or the first UDM network element in the foregoing method embodiment.

Specifically, the function/implementation process of the processing module 1301 and the transceiver module 1302 in FIG. 13 may be implemented by the processor 301 in FIG. 3 calling computer instructions stored in the memory 303. Alternatively, the function/implementation process of the processing module 1301 in FIG. 13 may be implemented by the processor 301 in FIG. 3 calling computer instructions stored in the memory 303, and the function/implementation process of the transceiver module 1302 in FIG. In the communication interface 304 to achieve.

The memory 303 may be used to store related instructions and data. For example, when the communication device is the first storage network element or is located on the first management and control network element, the memory 303 may also be used to store the correspondence between the PDUID of the first terminal and the identification of the first management and control network element, or to store The corresponding relationship between the RPAUID of the first terminal for the first application and the discovery parameter.

Optionally, an embodiment of the present application further provides a computer-readable storage medium, the computer-readable storage medium stores a computer instruction, and when the computer instruction runs on a communication device, the communication device executes the above-mentioned related method The steps implement the communication method in the foregoing embodiment. For example, the communication device may be the first management and control network element or the first PCF network element in the foregoing method embodiment. Alternatively, the communication device may be the second management and control network element or the second PCF network element in the foregoing method embodiment. Alternatively, the communication device may be the first storage network element or the first UDM network element in the foregoing method embodiment.

Optionally, the embodiment of the present application further provides a computer program product, which when the computer program product runs on a computer, causes the computer to execute the above-mentioned related steps, so as to implement the communication method executed by the communication device in the above-mentioned embodiment. For example, the communication device may be the first management and control network element or the first PCF network element in the foregoing method embodiment. Alternatively, the communication device may be the second management and control network element or the second PCF network element in the foregoing method embodiment. Alternatively, the communication device may be the first storage network element or the first UDM network element in the foregoing method embodiment.

Optionally, the embodiment of the present application further provides a device, which may specifically be a chip, a component, a module, or a system on a chip. The device may include a connected processor and a memory; where the memory is used to store computer instructions. When the device is running, the processor can execute the computer instructions stored in the memory so that the chip executes the communication performed by the communication device in the foregoing method embodiments. method. For example, the communication device may be the first management and control network element or the first PCF network element in the foregoing method embodiment. Alternatively, the communication device may be the second management and control network element or the second PCF network element in the foregoing method embodiment. Alternatively, the communication device may be the first storage network element or the first UDM network element in the foregoing method embodiment.

Optionally, an embodiment of the present application further provides a communication system, which includes a first management and control network element, a second management and control network element, and a first storage network element. The first management and control network element, the second management and control network element, and the first storage network element in the communication system can respectively execute the operations of the first management and control network element, the second management and control network element, and the first storage network element in the foregoing embodiments. The communication method performed.

Optionally, the communication system may also include devices such as the first terminal, the second terminal, and the server of the first application. The first terminal, the second terminal, and the server of the first application in the communication system can respectively execute the communication methods executed by the first terminal, the second terminal, and the server of the first application in the foregoing embodiments.

Among them, the communication device, computer readable storage medium, computer program product, chip or system-on-chip provided in the embodiments of the present application are all used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the above The beneficial effects of the corresponding methods provided in the article will not be repeated here.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of 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 devices. Computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, computer instructions may be transmitted from a website, computer, server, or data center through a cable (such as Coaxial cable, optical fiber, digital subscriber line (digital subscriber line, referred to as DSL) or wireless (such as infrared, wireless, microwave, etc.) transmission to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or includes one or more data storage devices such as a server or a data center that can be integrated with the medium. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

Although the present application is described in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art can understand and realize the disclosure by looking at the drawings, the disclosure, and the appended claims. Other changes to the embodiment. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "one" does not exclude a plurality. A single processor or other unit may implement several functions listed in the claims. Certain measures are described in mutually different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

Although the application has been described in combination with specific features and embodiments, it is obvious that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the specification and drawings are merely exemplary descriptions of the application as defined by the appended claims, and are deemed to cover any and all modifications, changes, combinations or equivalents within the scope of the application. Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these modifications and variations.

Claims

A communication method, characterized in that it comprises:

The first management and control network element allocates the proximity service discovery user equipment identification PDUID to the first terminal;

The first management and control network element sends first information to the first storage network element, where the first information includes the PDUID of the first terminal and the identifier of the first management and control network element, and the first information is used for all The first storage network element stores the correspondence between the PDUID of the first terminal and the identifier of the first management and control network element;

Wherein, the first management and control network element stores the discovery parameters of the first terminal, and the discovery parameters are used for device-to-device D2D discovery.
The method according to claim 1, wherein before the first management and control network element sends the first information to the first storage network element, the method further comprises:

Sending, by the first management and control network element, an authorization request message to the server of the first application, where the authorization request message is used to request authorization of the first terminal to perform D2D discovery for the first application;

The first management and control network element receives an authorization response message from the server, where the authorization response message is used to indicate that the first terminal is successfully authorized to perform D2D discovery for the first application.
The method according to claim 1 or 2, characterized in that, before the first management and control network element sends the first information to the first storage network element, the method further comprises:

The first management and control network element receives a discovery request message from the first terminal, where the discovery request message is used to request D2D discovery.
The method according to claim 3, wherein the discovery request message includes the restricted proximity service application user identification RPAUID of the first terminal for the first application, and the first management and control network element sends the information to the first storage Before the network element sends the first information, the method further includes:

The first management and control network element allocates the discovery parameter according to the discovery request message, and the discovery parameter corresponds to the RPAUID.
The method according to claim 4, wherein before the first management and control network element sends the first information to the first storage network element, the method further comprises:

The first management and control network element sends a discovery response message to the first terminal, where the discovery response message includes the discovery parameter.
The method according to any one of claims 1-5, wherein the method further comprises:

When the validity period of the PDUID of the first terminal expires, the first management and control network element sends a first deletion request message to the first storage network element, where the first deletion request message is used to request deletion of the first terminal Correspondence between the PDUID of a terminal and the identification of the first management and control network element.
The method according to any one of claims 1 to 5, wherein the first information further comprises first indication information, and the first indication information is used to indicate the validity period of the PDUID of the first terminal.
A communication method, characterized in that it comprises:

The second management and control network element receives the target proximity discovery user equipment identification PDUID of the second terminal from the server of the first application, where the target PDUID includes the PDUID of the first terminal;

The second management and control network element sends a first message to the first storage network element according to the PDUID of the first terminal, the first message includes the PDUID of the first terminal, and the first message is used to obtain storage The identifier of the management and control network element with the discovery parameter of the first terminal;

The second management and control network element receives the identifier of the first management and control network element from the first storage network element, and the first management and control network element stores the discovery parameter of the first terminal.
The method according to claim 8, wherein the PDUID of the first terminal includes a first identifier, the first identifier is the identifier of the public land mobile network PLMN where the first terminal is located, and the second management The network element sending a first message to the first storage network element according to the PDUID of the first terminal includes:

Obtaining, by the second management and control network element, the identifier of the first storage network element in the PLMN corresponding to the first identifier from the network function library function network element according to the first identifier;

The second management and control network element sends the first message to the first storage network element according to the identifier of the first storage network element.
A communication method, characterized in that it comprises:

The first storage network element receives first information from the first management and control network element, where the first information includes the proximity service discovery user equipment identification PDUID of the first terminal and the identification of the first management and control network element;

Storing, by the first storage network element, the correspondence between the PDUID of the first terminal and the identifier of the first management and control network element;

The first storage network element receives a first message from a second management and control network element, the first message includes the PDUID of the first terminal, and the first message is used to obtain the corresponding PDUID of the first terminal The identification of the control network element;

The first storage network element sends the identifier of the first management and control network element to the second management and control network element according to the first message and the corresponding relationship.
The method according to claim 10, wherein the method further comprises:

The first storage network element receives a first deletion request message from the first management and control network element, where the first deletion request message is used to request the deletion of the PDUID of the first terminal and the information of the first management and control network element. Correspondence between signs;

The first storage network element deletes the correspondence between the PDUID of the first terminal and the identifier of the first management and control network element according to the first deletion request message.
The method according to claim 10, wherein the first information further comprises first indication information, and the first indication information is used to indicate the validity period of the PDUID of the first terminal; the method further comprises:

When the validity period of the PDUID of the first terminal expires, the first storage network element deletes the correspondence between the PDUID of the first terminal and the identity of the first management and control network element.
A communication method, characterized in that it comprises:

The first management and control network element obtains second information, where the second information includes the restricted proximity service application user identification RPAUID of the first terminal for the first application and discovery parameters, and the discovery parameters are used for device-to-device D2D discovery;

The first management and control network element sends the second information to a first storage network element, where the second information is used by the first storage network element to save the correspondence between the RPAUID and the discovery parameter.
The method according to claim 13, wherein the method further comprises:

When the validity period of the discovery parameter expires, the first management and control network element sends a second deletion request message to the first storage network element, and the second deletion request message is used to request deletion of the RPAUID and the Find the correspondence between the parameters.
The method according to claim 13, wherein the second information further comprises second indication information, and the second indication information is used to indicate the validity period of the discovery parameter.
A communication method, characterized in that it comprises:

The second management and control network element receives the target proximity discovery user equipment identification PDUID of the second terminal from the server of the first application, where the target PDUID includes the PDUID of the first terminal;

The second management and control network element sends a second message to the first storage network element according to the PDUID of the first terminal, where the second message includes the restricted proximity service application of the first terminal for the first application User identification RPAUID, the second message is used to obtain discovery parameters corresponding to the RPAUID;

The second management and control network element receives the discovery parameter from the first storage network element, and the discovery parameter is used for device-to-device D2D discovery.
The method according to claim 16, wherein the PDUID of the first terminal includes a first identifier, the first identifier is the identifier of the public land mobile network PLMN where the first terminal is located, and the second management The network element sending a second message to the first storage network element according to the PDUID of the first terminal includes:

Obtaining, by the second management and control network element, the identifier of the first storage network element in the PLMN corresponding to the first identifier from the network function library function network element according to the first identifier;

The second management and control network element sends the second message to the first storage network element according to the identifier of the first storage network element.
A communication method, characterized in that it comprises:

The first storage network element receives second information from the first management and control network element, where the second information includes the restricted proximity service application user identification RPAUID of the first terminal for the first application and discovery parameters, and the discovery parameters are used for the device To the device D2D discovery;

Storing, by the first storage network element, the correspondence between the RPAUID and the discovery parameter;

Receiving, by the first storage network element, a second message from a second management and control network element, the second message including the RPAUID, and the second message is used to obtain the discovery parameter corresponding to the RPAUID;

The first storage network element sends the discovery parameter to the second management and control network element according to the second message and the corresponding relationship.
The method according to claim 18, wherein after the first storage network element receives the second information from the first management and control network element, the method further comprises:

Receiving, by the first storage network element, a second deletion request message from the first management and control network element, where the second deletion request message is used to request deletion of the correspondence between the RPAUID and the discovery parameter;

The first storage network element deletes the correspondence between the RPAUID and the discovery parameter according to the second deletion request message.
The method according to claim 18, wherein the second information further comprises second indication information, and the second indication information is used to indicate the validity period of the discovery parameter; After the second information from the first management and control network element, the method further includes:

When the validity period of the discovery parameter expires, the first storage network element deletes the correspondence between the RPAUID and the discovery parameter.
A communication device, characterized by comprising a processing module and a transceiver module; wherein, the processing module is used for:

Allocating a proximity service discovery user equipment identification PDUID to the first terminal through the transceiver module;

The first information is sent to the first storage network element through the transceiver module, the first information includes the PDUID of the first terminal and the identification of the first management and control network element, and the first information is used for the first storage The network element stores the correspondence between the PDUID of the first terminal and the identifier of the first management and control network element;

Wherein, the first management and control network element stores the discovery parameters of the first terminal, and the discovery parameters are used for device-to-device D2D discovery.
The communication device according to claim 21, wherein the processing module is further configured to:

Before sending the first information to the first storage network element through the transceiver module, send an authorization request message to the server of the first application, where the authorization request message is used to request the first terminal to authorize the first application to perform D2D discovery;

An authorization response message from the server is received through the transceiver module, where the authorization response message is used to indicate that the first terminal is successfully authorized to perform D2D discovery for the first application.
The communication device according to claim 21 or 22, wherein the processing module is further configured to:

Before sending the first information to the first storage network element through the transceiver module, receiving a discovery request message from the first terminal, where the discovery request message is used to request D2D discovery.
The communication device according to claim 23, wherein the discovery request message includes the restricted proximity service application user identification RPAUID of the first terminal for the first application, and the processing module is further configured to:

Before sending the first information to the first storage network element through the transceiver module, the discovery parameter is allocated according to the discovery request message, and the discovery parameter corresponds to the RPAUID.
The communication device according to claim 24, wherein the processing module is further configured to:

Before sending the first information to the first storage network element through the transceiver module, a discovery response message is sent to the first terminal, where the discovery response message includes the discovery parameter.
The communication device according to any one of claims 21-25, wherein the processing module is further configured to:

When the validity period of the PDUID of the first terminal expires, a first deletion request message is sent to the first storage network element through the transceiver module, where the first deletion request message is used to request deletion of the first terminal The corresponding relationship between the PDUID of and the identifier of the first management and control network element.
The communication device according to any one of claims 21-25, wherein the first information further comprises first indication information, and the first indication information is used to indicate the validity period of the PDUID of the first terminal.
A communication device, characterized by comprising a processing module and a transceiver module; wherein, the processing module is used for:

Receiving the target proximity discovery user equipment identification PDUID of the second terminal from the server of the first application through the transceiver module, where the target PDUID includes the PDUID of the first terminal;

According to the PDUID of the first terminal, the transceiver module sends a first message to the first storage network element. The first message includes the PDUID of the first terminal, and the first message is used to obtain the stored information. The identification of the management and control network element of the discovery parameter of the first terminal;

The identifier of the first management and control network element is received from the first storage network element through the transceiver module, and the first management and control network element stores the discovery parameter of the first terminal.
The communication device according to claim 28, wherein the PDUID of the first terminal includes a first identifier, and the first identifier is an identifier of a public land mobile network PLMN where the first terminal is located, and the processing module Specifically used for:

Obtaining, according to the first identifier, the identifier of the first storage network element in the PLMN corresponding to the first identifier from a network function network element of the network function library;

According to the identifier of the first storage network element, the first message is sent to the first storage network element through the transceiver module.
A communication device, characterized by comprising a processing module and a transceiver module; wherein, the processing module is used for:

Receiving first information from a first management and control network element through the transceiver module, where the first information includes the proximity service discovery user equipment identification PDUID of the first terminal and the identification of the first management and control network element;

Storing the correspondence between the PDUID of the first terminal and the identifier of the first management and control network element;

A first message from a second management and control network element is received through the transceiver module, the first message includes the PDUID of the first terminal, and the first message is used to obtain the management and control network corresponding to the PDUID of the first terminal Yuan's identity;

According to the first message and the corresponding relationship, the identifier of the first management and control network element is sent to the second management and control network element through the transceiver module.
The communication device according to claim 30, wherein the processing module is further configured to:

A first deletion request message from the first management and control network element is received through the transceiver module, where the first deletion request message is used to request to delete one of the PDUID of the first terminal and the identification of the first management and control network element Correspondence between;

According to the first deletion request message, delete the correspondence between the PDUID of the first terminal and the identifier of the first management and control network element.
The communication device according to claim 30, wherein the first information further comprises first indication information, and the first indication information is used to indicate the validity period of the PDUID of the first terminal; the processing module further Used for:

When the validity period of the PDUID of the first terminal expires, delete the correspondence between the PDUID of the first terminal and the identity of the first management and control network element.
A communication device, characterized by comprising a processing module and a transceiver module; wherein, the processing module is used for:

Acquiring second information, where the second information includes a restricted proximity service application user identifier RPAUID of the first terminal for the first application and a discovery parameter, the discovery parameter being used for device-to-device D2D discovery;

The second information is sent to the first storage network element through the transceiver module, where the second information is used by the first storage network element to save the correspondence between the RPAUID and the discovery parameter.
The communication device according to claim 33, wherein the processing module is further configured to:

When the validity period of the discovery parameter expires, a second deletion request message is sent to the first storage network element through the transceiver module, and the second deletion request message is used to request deletion of the RPAUID and the discovery parameter Correspondence between.
The communication device according to claim 33, wherein the second information further comprises second indication information, and the second indication information is used to indicate the validity period of the discovery parameter.
A communication device, characterized by comprising a processing module and a transceiver module; wherein, the processing module is used for:

Receiving the target proximity discovery user equipment identification PDUID of the second terminal from the server of the first application through the transceiver module, where the target PDUID includes the PDUID of the first terminal;

According to the PDUID of the first terminal, a second message is sent to the first storage network element through the transceiver module, the second message including the user identification of the restricted proximity service application of the first terminal for the first application RPAUID, the second message is used to obtain the discovery parameter corresponding to the RPAUID;

The discovery parameter is received from the first storage network element through the transceiver module, and the discovery parameter is used for device-to-device D2D discovery.
The communication device according to claim 36, wherein the PDUID of the first terminal includes a first identifier, and the first identifier is an identifier of a public land mobile network PLMN where the first terminal is located, and the processing module Specifically used for:

Obtaining, according to the first identifier, the identifier of the first storage network element in the PLMN corresponding to the first identifier from a network function network element of the network function library;

According to the identifier of the first storage network element, the second message is sent to the first storage network element through the transceiver module.
A communication device, characterized by comprising a processing module and a transceiver module; wherein, the processing module is used for:

The second information from the first management and control network element is received through the transceiver module, the second information includes the restricted proximity service application user identification RPAUID of the first terminal for the first application and discovery parameters, and the discovery parameters are used for the device To the device D2D discovery;

Store the correspondence between the RPAUID and the discovery parameter;

Receiving a second message from a second management and control network element through the transceiver module, where the second message includes the RPAUID, and the second message is used to obtain discovery parameters corresponding to the RPAUID;

According to the second message and the corresponding relationship, the discovery parameter is sent to the second management and control network element through the transceiver module.
The communication device according to claim 38, wherein the processing module is further configured to:

After receiving the second information from the first management and control network element through the transceiver module, a second deletion request message from the first management and control network element is received through the transceiver module, and the second deletion request message is used to request Delete the correspondence between the RPAUID and the discovery parameter;

According to the second deletion request message, delete the correspondence between the RPAUID and the discovery parameter.
The communication device according to claim 38, wherein the second information further comprises second indication information, and the second indication information is used to indicate the validity period of the discovery parameter; and the processing module is further used to:

After receiving the second information from the first management and control network element through the transceiver module, when the validity period of the discovery parameter expires, delete the correspondence between the RPAUID and the discovery parameter.
A communication device, characterized by comprising: a processor and a memory; wherein the memory is used to store computer instructions, and when the communication device is running, the processor executes the computer instructions stored in the memory, Implement the method according to any one of claims 1-7, or the method according to any one of claims 8-9, or the method according to any one of claims 10-12, or claim 13 The method of any one of -15, or the method of any one of claims 16-17, or the method of any one of claims 18-20.
A computer-readable storage medium, characterized in that instructions are stored in the readable storage medium, and when the instructions are executed, the method as claimed in any one of claims 1-7, or as claimed in claim The method according to any one of 8-9, or the method according to any one of claims 10-12, or the method according to any one of claims 13-15, or any one of claims 16-17 The method according to item, or the method according to any one of claims 18-20.
A computer program product, wherein the computer program product includes computer instructions, when the computer instructions are executed on a computer, the computer is caused to execute the method according to any one of claims 1-7, or as claimed in claim 8. The method according to any one of -9, or the method according to any one of claims 10-12, or the method according to any one of claims 13-15, or any one of claims 16-17 The method, or the method according to any one of claims 18-20.