Communication method and system and storage medium

Abstract

The invention provides a communication method and system and a storage medium, and is used for a railway mobile communication system RMCS, and the communication method comprises a first method for group communication: an RMCS core network receives a group call request sent by a first terminal device; the RMCS core network forwards the group call request to an IMS core network; the IMS core network sends invitation information of joining the group call to each second terminal device in the communication group; and the IMS core network establishes a media session based on a communication group, and a media stream forwards a data packet through the RMCS core network. According to the communication method provided by the technical scheme of the invention, the group call establishment efficiency in a railway mobile communication system is remarkably improved, and the group communication deployment complexity and cost are reduced; moreover, by means of the service superposition characteristic of the IMS core network, new business application can be conveniently introduced, and each functional entity can be elastically expanded and dynamically deployed according to business requirements, so that the method is suitable for development and innovation of future railway mobile communication business.

Description

Technical Field

[0001] The present invention relates to the field of mobile communication technology, and in particular to a communication method, system and storage medium for railway mobile communication. Background Art

[0002] With the continuous development and modernization of railway systems, Railway Mobile Communication Systems (RMCS) play an increasingly important role in railway operations. RMCS provides reliable and efficient voice and data communication services for railway staff and passengers, ensuring the safety and efficiency of train operations.

[0003] Currently, RMCS is mainly based on GSM-R technology, which has been widely used in railway systems around the world. However, with the growth of business needs and the development of emerging technologies, GSM-R faces some limitations and challenges. First, the data transmission rate of GSM-R is relatively low, which is difficult to meet the demand for high-speed data transmission in future railway applications. Second, GSM-R lacks the ability to support new multimedia services such as VoIP. In addition, in terms of group communication, GSM-R uses the traditional ASCI (Advanced Voice Call Service) technology.

[0004] In the RMCS architecture, group communication is considered an important key business capability. Efficient and reliable group communication is essential for railway dispatching, emergency response, and train crew. However, existing group communication solutions often take a long time to establish and manage groups, and communication efficiency needs to be improved.

[0005] Moreover, in terms of cross-system compatibility, the group call function of the GSM-R system is mainly based on the GSM standard, and may have compatibility issues with future new technologies such as 5G. In addition, in terms of functional scalability, with the continuous development of railway business, the demand for group call functions is also increasing, and the existing system may find it difficult to support more complex functional requirements. Summary of the invention

[0006] The object of the present invention is to provide a communication method, system and storage medium for railway mobile communication which can effectively improve the call efficiency of multi-party calls and have good system compatibility.

[0007] In order to achieve the above object, the present invention provides a communication method for a railway mobile communication system RMCS, characterized in that the communication method includes a first method for group communication:

[0008] The RMCS core network receives a group call request sent by the first terminal device, wherein the group call request is used to request to establish a communication group including the first terminal device and a plurality of second terminal devices;

[0009] After confirming the information of each member in the communication group, the RMCS core network forwards the group call request to the IMS core network;

[0010] After verifying the subscription information and service authority of the first terminal device, the IMS core network sends an invitation message for joining the group call to each of the second terminal devices in the communication group;

[0011] After receiving the response information of the second terminal device agreeing to join the group, the IMS core network establishes a media session based on the communication group, and the media stream forwards the data packet through the RMCS core network.

[0012] Preferably, the first terminal device and the second terminal device are connected to the RMCS core network via the RMCS wireless access network.

[0013] Preferably, the RMCS core network receives the group call request based on a proxy call session control function P-CSCF, and is responsible for establishing and managing sessions related to the communication group through a service call session control function S-CSCF.

[0014] Preferably, the IMS core network sends the invitation information via S-CSCF and a group call server.

[0015] Preferably, any member of the communication group may send an end request to end the current group communication, and the IMS core network closes the current communication group based on the end request.

[0016] Preferably, the communication method includes a second method for call transfer:

[0017] The RMCS core network receives a call request sent by the third terminal device requesting communication with the fourth terminal device, and forwards the call request to the IMS core network;

[0018] When the IMS core network confirms that the fourth terminal device is in a busy state, transferring the current call to the fifth terminal device according to a pre-configured transfer rule corresponding to the fourth terminal device;

[0019] After the IMS core network receives the answering response information of the fifth terminal device, the session is established through the service call session control function S-CSCF and the call transfer server, and the RMCS core network routes and forwards the media stream.

[0020] Preferably, it also includes a self-organizing network set up along the railway or on the train.

[0021] The present invention also provides a communication system for railway mobile communication, wherein the communication system works based on the communication method described above.

[0022] The present invention also provides a communication system, comprising:

[0023] one or more processors;

[0024] Memory;

[0025] and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs including instructions for executing the communication method as described above.

[0026] The present invention also provides a computer-readable storage medium, characterized in that it includes a computer program, and the computer program can be executed by a processor to implement the communication method as described above.

[0027] Compared with the prior art, the communication method provided by the above technical solution of the present invention optimizes the group establishment process through the division of labor and cooperation between the RMCS core network and the IMS core network. The RMCS core network is responsible for confirming the group member information, and the IMS core network sends call invitations in parallel, which reduces the number of signaling interactions and the delay, and significantly improves the efficiency of group call establishment. In addition, through the introduction of the IMS core network, it is consistent with the RMCS network architecture, ensuring compatibility with the existing all-IP network, and reducing the complexity and cost of group communication deployment. Furthermore, with the help of the service overlay characteristics of the IMS core network, new business applications can be easily introduced, and each functional entity can be elastically expanded and dynamically deployed according to business needs to adapt to the development and innovation of future railway mobile communication services. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Flow chart of the first method in an embodiment of the present invention.

[0029] Figure 2 4 is a flow chart of the second method in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0031] This embodiment discloses a communication method for a railway mobile communication system (Railway Mobile Communication System, RMCS for short), such as Figure 1 , the communication method includes a first method of group communication:

[0032] S10: The RMCS core network receives a group call request sent by the first terminal device, where the group call request is used to request to establish a communication group including the first terminal device and a plurality of second terminal devices;

[0033] S11: After the RMCS core network confirms the information of each member in the communication group, it forwards the group call request to the IMS (IP Multimedia System) core network;

[0034] S12: After verifying the subscription information and service authority of the first terminal device, the IMS core network sends an invitation message for joining the group call to each second terminal device in the communication group;

[0035] S13: After receiving the response information returned by each second terminal device agreeing to join the group, the IMS core network establishes a media session based on the communication group, and the media stream forwards the data packet through the RMCS core network.

[0036] In this embodiment, the RMCS core network is a core network designed specifically for railway mobile communications, aiming to meet the railway industry's special requirements for high reliability, security and real-time performance. It is responsible for processing special functions of railway communications, including data transmission, mobility management and session management.

[0037] The IMS core network is a standardized telecommunications network architecture for providing multimedia services such as voice, video and messaging over IP networks. The IMS core network consists of a series of functional entities responsible for the control, management and routing of multimedia sessions.

[0038] In this embodiment, the RMCS core network uses the multimedia session control capability of the IMS core network to provide advanced communication services such as group calling and call forwarding.

[0039] Specifically, the RMCS core network is mainly responsible for data layer processing, including mobility management, data packet routing and transmission, security authentication, etc. It ensures that the terminal devices on the train can reliably access the network and maintain connection with the network.

[0040] The IMS core network is responsible for session-level control, including the establishment, maintenance, and termination of multimedia sessions. It uses the Session Initiation Protocol (SIP) to manage communication sessions and provide logical processing for services such as group calls and call forwarding.

[0041] More specifically, the RMCS core network includes the following network elements:

[0042] MME (Mobility Management Entity): handles mobility management and signaling;

[0043] S-GW (Serving Gateway) and P-GW (PDN Gateway): responsible for routing and forwarding data packets;

[0044] eNodeB: Provides wireless access and communicates directly with user equipment.

[0045] The IMS core network includes the following network elements:

[0046] P-CSCF (Proxy-Call Session Control Function): The first point of contact for user equipment to access the IMS core network;

[0047] S-CSCF (Serving-CSCF, Serving Call Session Control Function): core session control function, responsible for user session management;

[0048] HSS (Home Subscriber Server): stores user subscription and authentication information.

[0049] Application Server (AS): Provides specific service logic, such as group calling and call forwarding.

[0050] On the other hand, the first terminal device and the second terminal device are connected to the RMCS core network via the RMCS radio access network.

[0051] The RMCS core network receives group call requests based on the proxy call session control function P-CSCF, and is responsible for establishing and managing sessions related to the communication group through the service call session control function S-CSCF.

[0052] Furthermore, the IMS core network sends the invitation information through the S-CSCF and the group call server.

[0053] The following is a specific example to illustrate the execution process of the first method.

[0054] 01. Initiation of group call:

[0055] On a train, when user A wants to initiate a group call to learn about the train's operating information, user A selects the preset "signal maintenance group", which includes the dispatcher (user B), maintenance engineer (user C), and operators at stations along the way (users D, E, F).

[0056] The first terminal device of user A is connected to the FRMCS core network through the RMCS radio access network (such as eNodeB). The FRMCS access point verifies the authority and group information of the first terminal device and transmits the group call request to the RMCS core network.

[0057] 02. Core network processing request:

[0058] After receiving the group call request from user A, the RMCS core network confirms the information of the group members. The RMCS core network confirms the group member list by querying the database, and routes and forwards the data packet through the S-GW.

[0059] The RMCS core network sends the group call request to the IMS core network. First, after receiving the group call request, the P-CSCF verifies the subscription information and service rights of user A. Then, the S-CSCF is responsible for the establishment and management of the session and confirms whether all group members can participate in the call.

[0060] 03. Group members join the call:

[0061] The IMS core network sends an invitation to join the group call to all members (B, C, D, E, F) in the group through the S-CSCF and the group call server. Each member's terminal device (i.e., the second terminal device) receives the invitation message of the SIP protocol, and the terminal device prompts the user to participate in the group call.

[0062] After the group members confirm to join the call, the IMS core network starts to establish the actual media session. The media stream forwards the data packets through the S-GW and P-GW of the RMCS core network to ensure that all members can participate in the group call in real time.

[0063] 04. Real-time communication in group calls:

[0064] After all group members join, each member starts a voice conversation.

[0065] 05. Group call ends:

[0066] When the group members finish communicating, the group call can be terminated by any participant. That is, the terminal device sends a request to terminate the session, the IMS core network is responsible for closing the session, the RMCS core network stops forwarding data packets, and the group call ends.

[0067] In summary, through the division of labor and cooperation between the RMCS core network and the IMS core network, the group establishment process is optimized. The RMCS core network is responsible for confirming the group member information, and the IMS core network sends call invitations in parallel, reducing the number of signaling interactions and latency, and significantly improving the efficiency of group call establishment. In addition, through the introduction of the IMS core network, it is consistent with the RMCS network architecture, ensuring compatibility with the existing all-IP network, and reducing deployment complexity and cost. Furthermore, with the help of the service overlay characteristics of the IMS core network, new business applications can be easily introduced, and each functional entity can be elastically expanded and dynamically deployed according to business needs to adapt to the development and innovation of future railway mobile communication services.

[0068] In another preferred embodiment of the present invention, Figure 2 , the communication method further includes a second method for call transfer:

[0069] S20: The RMCS core network receives a call request sent by the third terminal device requesting communication with the fourth terminal, and forwards the call request to the IMS core network;

[0070] S21: when the IMS core network confirms that the fourth terminal device is in a busy state, the current call is transferred to the fifth terminal device according to a pre-configured transfer rule corresponding to the fourth terminal device;

[0071] S22: After receiving the answering response information of the fifth terminal device, the IMS core network completes the establishment of the session through the service call session control function S-CSCF and the call transfer server, and the RMCS core network routes and forwards the media stream.

[0072] The following is an actual scenario on a train to illustrate the execution process of the second method.

[0073] 01.Configure call forwarding rules:

[0074] User A (the fourth terminal device) configures a call forwarding rule. The rule can be set to "when busy, automatically forward incoming calls to user B (the fifth terminal device)", and the rule is submitted to the call forwarding server.

[0075] After receiving the rules, the call transfer server stores them in the database.

[0076] 02. Call arrives and triggers transfer:

[0077] User C (third terminal device) initiates an emergency call and wants to contact user A. The call request is first transmitted to the P-CSCF in the IMS core network through the MME, S-GW, and P-GW of the RMCS core network.

[0078] After receiving the call request, the P-CSCF of the IMS core network forwards it to the S-CSCF. The S-CSCF confirms the status of user A based on the user information stored in the HSS and detects that user A is currently in the "busy" state.

[0079] 03. Perform call forwarding:

[0080] The S-CSCF forwards the incoming call request to the call forwarding server, which forwards the call to user B based on previously stored rules.

[0081] The call forwarding server returns the updated routing information (user B's number) to the S-CSCF. The S-CSCF reroutes the call to user B and sends a SIP invite message to user B to notify him to receive the forwarded call.

[0082] 04.Session establishment and communication:

[0083] After receiving the incoming call notification, user B confirms the call. The IMS core network completes the establishment of the session through the S-CSCF and the call transfer server, while the RMCS core network routes and forwards the media stream through the S-GW and P-GW.

[0084] User B successfully answers the call and starts communicating with user C.

[0085] In another preferred embodiment of the present invention, the communication method further comprises a self-organizing network (also called Ad Hoc network) set up along the railway or on the train.

[0086] When a train moves from one communication area to another, a smooth handover process can be achieved through the Ad Hoc network. For example, when a train approaches an area with weak signals or no service, it can pre-establish connections with other trains or Ad Hoc nodes along the line to ensure that calls are not interrupted.

[0087] In summary, the present invention discloses a communication method. First, with the help of the IMS core network, it ensures that the railway mobile communication system can be seamlessly connected with the existing GSM-R system, the future 5G system and other possible communication technologies to achieve cross-system communication interoperability. Secondly, it can flexibly configure various functional modules and support complex call strategies and business logic to meet the diverse needs of future railway communications.

[0088] The present invention also discloses a communication system for railway mobile communication, and the communication system works based on the communication method in the above embodiment.

[0089] The present invention also discloses another communication system, which includes one or more processors, a memory and one or more programs, wherein one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the program includes instructions for executing the communication method as described above. The processor can adopt a general central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for executing related programs to implement the functions required to be performed by the module in the communication system of the embodiment of the present application, or to execute the communication method of the method embodiment of the present application.

[0090] The present invention also discloses a computer-readable storage medium, which includes a computer program, and the computer program can be executed by a processor to complete the communication method as described above. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more available media integrated. The available medium can be a read-only memory (ROM), or a random access memory (RAM), or a magnetic medium, such as a floppy disk, a hard disk, a tape, a magnetic disk, or an optical medium, such as a digital versatile disc (DVD), or a semiconductor medium, such as a solid state disk (SSD).

[0091] The embodiment of the present application also discloses a computer program product or a computer program, which includes a computer instruction stored in a computer-readable storage medium. A processor of an electronic device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the electronic device executes the above communication method.

[0092] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A communication method for a railway mobile communication system RMCS, characterized in that: The communication method comprises a first method for group communication: The RMCS core network receives a group call request sent by the first terminal device, wherein the group call request is used to request to establish a communication group including the first terminal device and a plurality of second terminal devices; After confirming the information of each member in the communication group, the RMCS core network forwards the group call request to the IMS core network; After verifying the subscription information and service authority of the first terminal device, the IMS core network sends an invitation message for joining the group call to each of the second terminal devices in the communication group; After receiving the response information of the second terminal device agreeing to join the group, the IMS core network establishes a media session based on the communication group, and the media stream forwards the data packet through the RMCS core network.

2. The communication method according to claim 1, characterized in that: The first terminal device and the second terminal device are connected to the RMCS core network via the RMCS wireless access network.

3. The communication method according to claim 1, characterized in that: The RMCS core network receives the group call request based on a proxy call session control function P-CSCF, and is responsible for establishing and managing sessions related to the communication group through a service call session control function S-CSCF.

4. The communication method according to claim 3, characterized in that: The IMS core network sends the invitation information through the S-CSCF and the group call server.

5. The communication method according to claim 1, characterized in that: Any member of the communication group may send an end request to end the current group communication, and the IMS core network closes the current communication group based on the end request.

6. The communication method according to claim 1, characterized in that: The communication method includes a second method for call forwarding: The RMCS core network receives a call request sent by the third terminal device requesting communication with the fourth terminal device, and forwards the call request to the IMS core network; When the IMS core network confirms that the fourth terminal device is in a busy state, transferring the current call to the fifth terminal device according to a pre-configured transfer rule corresponding to the fourth terminal device; After the IMS core network receives the answering response information of the fifth terminal device, the session is established through the service call session control function S-CSCF and the call transfer server, and the RMCS core network routes and forwards the media stream.

7. The communication method according to claim 6, characterized in that: It also includes self-organizing networks set up along railway lines or on trains.

8. A communication system for railway mobile communication, characterized in that: The communication system operates based on the communication method according to any one of claims 1 to 7.

9. A communication system, characterized in that: include: one or more processors; Memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for executing the communication method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The invention comprises a computer program which can be executed by a processor to implement the communication method according to any one of claims 1 to 7.

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