CN116156475B - A method for roaming of MCX trunking communication services in railway 5G private network - Google Patents

Abstract

The invention discloses a method for roaming MCX cluster communication services on a railway 5G private network, which solves the problem that the existing roaming business processing scheme is not suitable for MCX broadband cluster communication services on a railway 5G private network. , so that the user terminal can accurately determine the occurrence of cross-office roaming; by registering the MCX system of the roaming office and performing the service roaming processing of the user terminal through the MCX system of the roaming office, it is beneficial to reduce the time delay of the cluster communication service of the roaming terminal and meet the requirements of railway operation and maintenance. Requirements, improve command and communication efficiency.

Description

A method for roaming of MCX trunking communication services in railway 5G private network

technical field

The present invention relates to the technical field of railway wireless communication, in particular to a method for roaming MCX cluster communication services on a railway 5G private network.

Background technique

With the research and promotion of railway 5G private network, my country's railways have clearly adopted 3GPP MCX (mission-critical communication) technology as a trunking communication business solution.

The railway 5G private network will be deployed according to the railway bureau, that is, each railway bureau will set up its own core network and MCX cluster communication system. For the actual scenario of railway application, when the user terminal moves to a non-home office, the implementation method of trunking communication service roaming is a key problem that needs to be solved.

The Chinese invention patent application with the publication number CN113891300A "Roaming service processing method and system, electronic equipment, storage medium" introduces the roaming service processing method, system and equipment under the public network, which is not applicable to the railway private network communication scenario. The Chinese invention patent application "Roaming Method and Device for Wireless Terminal" with publication number CN114205756A realizes a roaming access selection based on signal quality discrimination, and does not involve roaming service processing. The Chinese invention patent application with publication number CN113453211A "Roaming Scene Service Processing System Applied to Narrowband Trunking Communication System" introduces a roaming scene service processing system applied to narrowband trunking communication system, which is not applicable to MCX broadband of railway 5G private network Cluster communication business.

In addition, the 3GPP MCX (mission-critical communication) standard does not give a clear description of the service implementation method when the user roams, and only gives a preliminary user migration method; at the same time, it is compatible with the public network IMS (IP Multimedia Subsystem, IP Multimedia Subsystem System) business roaming processing methods are different, MCX technology and railway trunking communication services are specific and particular, therefore, it is necessary to study the roaming method of 5G private network MCX trunking communication services.

Contents of the invention

The purpose of the present invention is to provide a method for roaming MCX cluster communication services on a railway 5G private network, which can greatly reduce service delays, help improve the efficiency of railway cluster and dispatch communication, and facilitate railway operation, maintenance and management.

The purpose of the present invention is achieved by the following technical solutions:

A method for roaming of MCX trunking communication services in a railway 5G private network, comprising:

The user terminal realizes roaming awareness across offices according to the change of the current IP address;

When the user terminal perceives the occurrence of cross-office roaming, it obtains the IP address of the MCX system of the roaming office, and completes the registration process with the MCX system of the roaming office through the IP address of the MCX system of the roaming office; wherein, the MCX system is a key business communication system ;

After the user terminal completes the registration process with the MCX system of the roaming office, the MCX system of the roaming office performs service roaming processing according to the situation of the user terminal during the service process.

It can be seen from the above technical solution provided by the present invention that the user terminal can accurately determine the occurrence of inter-office roaming through the inter-office roaming perception; by registering the roaming office MCX system and performing the service roaming of the user terminal through the roaming office MCX system Processing is beneficial to reduce the delay of roaming terminal trunking communication services, meet the requirements of railway operation and maintenance, and improve the efficiency of command and communication.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative work.

FIG. 1 is a flow chart of a method for roaming a railway 5G private network MCX cluster communication service provided by an embodiment of the present invention;

FIG. 2 is a flowchart of user terminal inter-office roaming perception provided by an embodiment of the present invention;

Fig. 3 is the flow chart of user terminal registration in roaming office MCX system provided by the embodiment of the present invention;

Fig. 4 is the flow chart of logout of the user terminal in the MCX system of the roaming office provided by the embodiment of the present invention;

FIG. 5 is a flow chart of processing when the user terminal is used as an individual caller according to an embodiment of the present invention;

FIG. 6 is a flowchart of processing when a user terminal is called as an individual call provided by an embodiment of the present invention;

FIG. 7 is a flowchart of processing when a user terminal serves as a group call caller according to an embodiment of the present invention;

FIG. 8 is a flowchart of processing when a user terminal is called as a group call according to an embodiment of the present invention;

FIG. 9 is a processing flowchart when the user terminal serves as the sender of the point-to-point data service provided by the embodiment of the present invention;

FIG. 10 is a processing flow chart when the user terminal serves as a peer-to-peer data service receiver according to an embodiment of the present invention;

FIG. 11 is a processing flow chart when a user terminal serves as a group data sender according to an embodiment of the present invention;

FIG. 12 is a flowchart of processing when a user terminal serves as a group data receiver according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

First, the terms that may be used in this article are explained as follows:

The terms "comprising", "comprising", "containing", "having" or other descriptions with similar meanings shall be construed as non-exclusive inclusions. For example: including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.), should be interpreted as including not only a certain technical feature element explicitly listed, but also other technical feature elements not explicitly listed in the art.

Secondly, roaming of user terminals under the railway 5G private network is a relatively common phenomenon. If the trunking communication services of roaming terminals are all returned to the MCX system of the home office for processing, it is easy to cause large service delays and bring great impact on operation management and problem location. inconvenient. To this end, the embodiment of the present invention provides a method for roaming MCX trunking communication services on a railway 5G private network, including user terminal cross-office roaming perception, roaming office MCX system registration and deregistration, and service processing procedures in roaming scenarios, etc. After the roaming office MCX system is registered, follow-up services are directly initiated at the roaming office, which will greatly reduce service delays and help improve the efficiency of railway clustering and dispatching communications.

A method for roaming MCX cluster communication services on a railway 5G private network provided by the present invention will be described in detail below. The content not described in detail in the embodiments of the present invention belongs to the prior art known to those skilled in the art. In the embodiment of the present invention, if no specific conditions are indicated, it is carried out according to the conventional conditions in the art or the conditions suggested by the manufacturer.

As shown in Figure 1, the embodiment of the present invention provides a method for roaming MCX cluster communication services on a railway 5G private network, which mainly includes the following steps:

Step 1. The user terminal realizes inter-office roaming perception according to the change of the current IP address.

Step 2. When the user terminal perceives that roaming occurs across offices, obtain the IP address of the MCX system of the roaming office, and complete the registration process to the MCX system of the roaming office through the IP address of the MCX system of the roaming office; wherein, the MCX system is the key Business communication system.

Step 3: After the user terminal completes the registration process with the MCX system of the roaming office, the MCX system of the roaming office performs service roaming processing according to the role of the user terminal in the service process.

In order to more clearly demonstrate the technical solution provided by the present invention and the resulting technical effects, the method for roaming the MCX cluster communication service provided by the railway 5G private network provided by the embodiment of the present invention will be described in detail below with specific embodiments.

1. User terminal inter-office roaming perception.

Since the public network IMS (IP Multimedia Subsystem) terminal protocol stack is integrated in the underlying 4G/5G communication chip, when cross-IMS domain roaming occurs, the bottom layer of the terminal IMS interface triggers perceptual roaming. However, the railway MCX client protocol stack is located at the terminal application layer, and cannot perceive the occurrence of roaming through the underlying baseband protocol stack. Therefore, a method based on the change of the current IP address is proposed to realize cross-office roaming perception. Office roaming perception flow chart, mainly including:

(1) The user terminal leaves the 5G network coverage of the previous railway bureau, moves into the 5G network coverage of the roaming bureau, and completes the 5G network connection and registration process of the roaming bureau; this part indicates that the user terminal roams across the network.

(2) If the user terminal is currently in the process of business, the 5GC (core network) of the roaming office will keep the previously allocated PDU (protocol data unit) session and IP address unchanged to ensure the normal operation of the business; if the user terminal is idle state, the roaming office 5GC will notify the user terminal to complete the establishment of the roaming office PDU session.

(3) After the PDU session of the roaming office is established, the 5GC SMF (session management function) network element of the roaming office will issue instructions to the user terminal to inform the current IP address, including: DNS (Domain Name System) server IP address and user terminal IP address.

(4) After inter-office roaming occurs and the user terminal receives the current IP address, it can sense whether inter-office roaming occurs according to the change of the current IP address.

(5) When the IP address of the DNS server or the IP address of the user terminal (collectively referred to as the current IP address) changes, it is determined that inter-office roaming has occurred.

After that, log in and register with the MCX system of the roaming office (this part will be described in detail later).

2. Registration and deregistration of roaming office MCX system.

1. Register with the roaming office MCX system.

As shown in Figure 3, the user terminal registration process in the MCX system of the roaming office mainly includes:

(1) When the user terminal perceives the occurrence of cross-office roaming, it queries the roaming office DNS for the IP address of the roaming office MCX system according to the general domain name of the MCX system.

(2) Initiate initial configuration, user authentication, token (token) acquisition, configuration acquisition, and registration authorization requests to the roaming office MCX system according to the IP address of the roaming office MCX system.

(3) After receiving the request, the MCX system of the roaming office will reply the initial configuration response and determine whether to enable the roaming registration process. Among them, by comparing whether the number segment (office code) representing the home office in the user terminal number is consistent with the office code responsible for the MCX system of the roaming office, it is judged whether it is a roaming user terminal. If the office code is different, the user terminal It is a roaming user terminal; by checking whether the roaming user terminal has completed registration in the MCX system of the local roaming office, the current registration status of the roaming user terminal is judged. If it is determined that the user terminal is a roaming user terminal and the registration has not been completed, the registration process of the roaming user terminal is enabled.

(4) The MCX system of the roaming office forwards user authentication, token acquisition and configuration acquisition requests to the MCX system of the home office corresponding to the user terminal through the inter-system interface.

(5) After receiving the request, the MCX system of the home office completes the user authentication, token acquisition, and configuration acquisition process corresponding to the user terminal, and responds to the MCX system of the roaming office.

(6) The roaming office MCX system receives the response from the home office MCX system, forwards the response to the user terminal, and stores the token and configuration information carried in the response.

(7) If the response returned by the MCX system of the home office indicates that the user authentication is passed, the user terminal completes the registration in the MCX system of the roaming office. The user terminal can directly initiate services in the MCX system of the roaming office; at the same time, the MCX system of the roaming office sends a registration notification message to the MCX system of the home office, and the MCX system of the home office records that the user has roamed and stores the corresponding IP address of the MCX system of the roaming office Information for subsequent forwarding calls.

After the user terminal completes the registration process with the MCX system of the roaming office, it can be called a roaming user terminal, and then the MCX system of the roaming office provides business roaming services.

2. Logout of the MCX system of the roaming office.

As shown in Figure 4, the logout process of the roaming user terminal in the MCX system of the roaming office mainly includes:

(1) When the user terminal leaves the roaming office or actively initiates a logout, it initiates a logout request to the MCX system of the roaming office.

(2) The MCX system of the roaming office completes the logout of the user terminal and sends a response to the user terminal according to the received logout request; or, if the user terminal fails to register and keep alive after the time limit, the MCX system of the roaming office actively cancels the user terminal. Among them, to maintain the registration status, the user terminal needs to regularly send keep-alive information to the MCX system of the roaming office for registration and keep-alive. If the keep-alive information is not submitted on time, the registration status of the user terminal will be automatically set to cancel.

(3) After completing the deregistration of the user terminal, the MCX system of the roaming office sends a user terminal deregistration notice to the MCX system of the user terminal's home office.

(4) After receiving the logout notification, the MCX system of the home office records that the user terminal has been logged out in the corresponding roaming office MCX system.

3. Service processing in roaming scenarios.

In the embodiment of the present invention, the services of the user terminal include: individual call service, group call service, point-to-point data service and group data service of the user terminal; the present invention mainly considers service processing related to roaming. After registration and login, the roaming office MCX system will directly provide business roaming services.

1. Personal call service.

When the service of the current user terminal is a private call service, including the situation that the current user terminal is used as a private call caller and a private call, the current user terminal is a roaming user terminal, and in each case, it is performed through the MCX system of the roaming office. Service roaming processing.

A1. The current user terminal is used as the calling party of the individual call.

When the current user terminal is used as an individual call, it is called the calling user terminal, and the calling user terminal initiates a private call service request to the MCX system of the roaming office; after receiving the individual call service request, the MCX system of the roaming office verifies the calling user terminal relevant permissions, and parse out the called user terminal; send an individual call request to the called user terminal via the called office MCX system, wherein the called office MCX system is the MCX system where the called user terminal is located, that is: the called party The MCX system of the home office of the user terminal (roaming does not occur) or the MCX system of the roaming office of the called user terminal (roaming occurs); after receiving the individual call request, the called user terminal replies with a call connection response or rejects the response; if Respond to the connection call response, then the MCX system of the roaming office will reply the calling user terminal connection response.

As shown in Figure 5, the processing flow when the user terminal is used as an individual caller includes:

(1) User terminal 1 (calling user terminal) initiates an individual call service request to MCX system 1 of the roaming office.

(2) After receiving the request, the MCX system 1 of the roaming office verifies the relevant rights of the user terminal 1 and analyzes the called user terminal.

(3) If the called user terminal is an MCX system user of another office, the MCX system 1 of the roaming office sends an individual call request to the called user terminal 2 via the MCX system 2 of the called office; user terminal, the roaming office MCX system 1 directly sends an individual call request to the called user terminal 2.

(4) After the called user terminal 2 receives the request, if it is connected, it will reply the roaming office MCX system 1 with a connected call response; if it refuses, it will reply a rejection response.

(5) The MCX system 1 of the roaming office replies to the calling user terminal according to the response returned by the called user terminal 2, and if it is connected, it replies that the calling user terminal is connected.

(6) The calling and called user terminals complete the individual call service call establishment process and start media stream interaction.

A2. The current user terminal is called as an individual call.

When the current user terminal is called as an individual call, it is called the called user terminal, and the roaming office MCX system of the called user terminal receives an individual call service request from the calling office MCX system, wherein the calling office MCX system is The MCX system where the calling user terminal is located, that is: the MCX system of the home office of the calling user terminal (no roaming occurs) or the MCX system of the roaming office of the calling user terminal (roaming occurs), the calling MCX system first passes through the called The MCX system of the home office of the user terminal obtains the MCX system of the roaming office of the called user terminal, and then initiates an individual call service request to the MCX system of the roaming office of the called user terminal; after receiving the individual call request, the called user terminal replies and connects the call Respond or reject the response; if replying to connect the call response, then reply the called user terminal to connect the response through the MCX system of the roaming office.

As shown in Figure 6, the processing flow when the user terminal is called as an individual call includes:

(1) User terminal 1 (calling user terminal) initiates an individual call service request to MCX system 1 of the calling office.

(2) After receiving the request, the MCX system 1 of the calling office verifies the relevant rights of the user terminal 1 and analyzes the called user terminal 2.

(3) If the called user terminal 2 is a user of another office, the MCX system 1 of the calling office sends an individual call service request to the MCX system of the called user terminal's home office; the MCX system of the called user terminal's home office finds the called user Terminal 2 has already roamed, and then returns a redirection response to the calling office MCX system 1, which carries the address information of the called user terminal's roaming office MCX system 2; the calling office MCX system 1 resolves the called user terminal's roaming office MCX The address information of system 2 is used to resend an individual call request to the roaming office MCX system 2 of the called user terminal.

(4) The roaming office MCX system 2 of the called user terminal forwards the individual call service request to the called user terminal 2, and the called user terminal 2 receives the request. 2. Reply a connected call response to the calling office MCX system 1; if rejected, reply a rejection response.

(5) The MCX system 1 of the calling office replies to the calling user terminal according to the response returned by the called user terminal 2, and if it is connected, it replies that the calling user terminal is connected.

(6) The calling and called user terminals complete the individual call service call establishment process and start media stream interaction.

Those skilled in the art can understand that part A1 of the above introduction mainly considers the scenario where the calling user terminal is a roaming user terminal, and part A2 mainly considers the scenario where the called user terminal is a roaming user terminal; In the scenario where both the user terminal and the called user terminal are roaming user terminals, on the basis of part A1 and part A2 of the present invention, those skilled in the art can combine the aforementioned part A1 and part A2 to complete the corresponding business process flow.

2. Group call service.

When the service of the current user terminal is a group call service, including the situation that the user terminal is used as a group call caller and a group call called, the current user terminal is a roaming user terminal, and in each case, the service is performed through the MCX system of the roaming office Roaming handling.

B1. The current user terminal is used as the calling party of the group call.

When the current user terminal is used as a group call caller, it is called the calling user terminal, and the calling user terminal initiates a group call service request to the MCX system of the roaming office; after receiving the group call service request, the MCX system of the roaming office verifies the calling user terminal relevant authority, and analyze the group call called member information, the group call called members are all called user terminals; after the verification is passed, the MCX system of the roaming office will reply the calling user terminal to connect the group call response; and according to the group call To call the called member information, send a group call request to the called user terminal one by one, and pull the called user terminal into the group call one by one.

As shown in Figure 7, the processing flow when the user terminal acts as a group call caller mainly includes:

(1) User terminal a1 (that is, the calling user terminal, which is a roaming user terminal) initiates a group call service request to MCX system A of the roaming office.

(2) After receiving the request, MCX system A of the roaming office verifies the relevant authority of the user terminal a1, and analyzes the information of the called member of the group call.

(3) After the verification is passed, the MCX system of the roaming office replies with a group call connection response for the calling user terminal.

(4) According to the information of the called members of the group call, the MCX system of the roaming office sends group call requests to the called user terminal a2 and the called user terminal b3 one by one, and pulls the called members into the group call one by one; when the called user terminal b3 belongs to For other MCX systems, call the called user terminal b3 through its corresponding home office MCX system B; the number of the two called user terminals provided here is only an example, and it needs to be determined according to the actual situation in actual applications.

(5) Complete the call establishment process of the group call service, and start media stream interaction among group members.

B2. The current user terminal is called as a group call.

When the current user terminal is called as a group call, it is called the called user terminal. The MCX system of the roaming office of the called user terminal receives a group call service request from the calling office MCX system and is pulled into the group call. Of course, a series of processing procedures of the calling user terminal are also included before this.

As shown in Figure 8, the processing flow when the user terminal (specifically the called user terminal b3 in Figure 8) is called as a group call mainly includes:

(1) User terminal a1 (calling user terminal) initiates a group call service request to MCX system A of the calling office.

(2) After receiving the request, the MCX system A of the calling office verifies the user's relevant authority and analyzes the information of the called member of the group call.

(3) After the verification is passed, the calling party MCX system A replies to the calling user terminal to connect to the group call response.

(4) According to the information of the called members of the group call, send group call requests to other called user terminals one by one, and pull the called members into the group call one by one. The calling office MCX system A sends a group call request to the local called user terminal a2 (that is, the user terminal belonging to the calling office MCX system A); if it is found that the roaming office MCX system of the called user terminal b3 is the calling office MCX system A, the calling office MCX system A directly sends a group call request to the called user terminal b3; if the called user terminal b3 is not roaming, then sends a group call request to b3 through the home office MCX system B of the called user terminal b3 ; If the roaming office MCX system of the called user terminal b3 is not the calling office MCX system, but roams to another roaming office MCX system H, then after being redirected by the home office MCX system of the called user terminal b3, through the called The roaming office MCX system H of the user terminal b3 sends a group call request to the called user terminal b3.

(5) Complete the call establishment process of the group call service, and start media stream interaction among group members.

3. Point-to-point data services.

When the service of the current user terminal is a point-to-point data service, it includes: the current user terminal is a roaming user terminal, and serves as a point-to-point data sender and a point-to-point data receiver. In each case, it is performed through the roaming office MCX system Service roaming processing; among them, the point-to-point data service includes two types of sub-services, point-to-point short data and point-to-point file transmission.

C1. The current user terminal acts as a peer-to-peer data sender.

For the point-to-point short data sub-service, the current user terminal, as the sender, initiates a point-to-point short data service request to the MCX system of the roaming office; after receiving the point-to-point short data service request, the MCX system of the roaming office verifies the relevant permissions of the sender and resolves the receiver , and reply to the sender to receive a response; then send a point-to-point short data request to the receiver through the MCX system of the receiver's office; where the receiver is the user terminal, and the MCX system of the receiver's office is the MCX system where the receiver is located, that is: the receiver's The MCX system of the home office (roaming does not occur) or the MCX system of the receiver's roaming office (roaming occurs); after receiving the point-to-point short data request, the receiver replies to the MCX system of the roaming office. In the point-to-point short data sub-service, the point-to-point short data service request carries the corresponding short data content, so the receiver can directly display the corresponding short data content after receiving the point-to-point short data request.

For the point-to-point file transfer sub-service, the current user terminal acts as the sender, first, uploads the file to the MCX system of the roaming office, and the MCX system of the roaming office stores the file after receiving it, and returns a file upload response, which contains the storage address information of the file; then , through the point-to-point short data sub-service, the MCX system of the roaming office transmits the file storage address information to the receiver; after that, the receiver (user terminal) sends a file download request to the MCX system of the roaming office according to the file storage address information, roaming The office MCX system replies to the recipient with a file download response containing the file content.

As shown in Figure 9, the processing flow when the user terminal serves as the sender of the point-to-point data service mainly includes:

C11. Point-to-point short data.

(1) User terminal 1 (the sender, which is a roaming user terminal) initiates a point-to-point short data service request to MCX system 1 of the roaming office.

(2) After receiving the request, the MCX system 1 of the roaming office verifies the relevant authority of the user terminal 1, and resolves the receiver; replies to the user terminal 1 to receive the response.

(3) If the receiver (user terminal 2) is a user terminal of another MCX system, the roaming office MCX system 1 sends a point-to-point short data request to the receiver 2 via the receiver office MCX system 2; if the receiver is a roaming office MCX The user terminal of system 1 directly sends a point-to-point short data request to the receiver.

(4) The receiver receives the request, replies to the roaming office MCX system 1 to receive the response, and displays the data information to the receiver.

C12. During peer-to-peer file transfer.

(5) If the service initiated by user terminal 1 is a point-to-point file, upload the file to the roaming office MCX system 1 before the aforementioned step (1), and the roaming office MCX system 1 will store the file after receiving it, and reply the file upload response , which carries the storage address information of the file.

(6) For the file transfer business, the transfer of information such as file storage address and file description is completed through the aforementioned steps (1) to (4). Of course, the content of the request is also correspondingly changed to a point-to-point file transfer request.

(7) For the file transfer service, after step (4), the receiver will send a file download request to the roaming bureau MCX system 1 according to the file storage address, and the roaming bureau MCX system 1 will reply with a file download response after receiving the download request. Which carries the specific content of the file.

C2. The current user terminal acts as a peer-to-peer data receiver.

For the point-to-point short data sub-service, the current user terminal is the receiver; the receiver’s roaming office MCX system receives the request from the sender’s office MCX system to initiate the point-to-point short data sub-service request, wherein the sender’s office MCX system first passes the receiver’s The office MCX system obtains the receiver's roaming office MCX system, and then initiates a point-to-point short data sub-service request to the receiver's roaming office MCX system; after the receiver receives the point-to-point short data service request, it sends to The MCX system of the operator's office replies to receive the response. Of course, a series of processing procedures for the sender are also included before this. The sender here is the user terminal, and the MCX system of the sender's office is the MCX system where the sender is located, that is, the MCX system of the sender's home office (no roaming occurs) or the MCX system of the roaming office of the sender (roaming occurs).

For the point-to-point file transmission sub-service, the current user terminal, as the receiver, receives the file storage address information transmitted by the MCX system of the sender office through the point-to-point short data sub-service; The MCX system of the roaming office sends a file download request to the MCX system of the sender office, and then receives a file download response containing file content from the MCX system of the sender office via the MCX system of the receiver's roaming office. Of course, before this, the process of uploading files by the sender is also included.

As shown in Figure 10, the processing flow when the user terminal serves as the receiver of the point-to-point data service mainly includes:

C21, point-to-point short data.

(1) The user terminal 1 (sender) initiates a point-to-point short data service request to the sender office MCX system 1; the sender office MCX system is the MCX system where the called sender is located.

(2) After receiving the request, the MCX system 1 of the sender office verifies the relevant authority of the sender and analyzes the receiver; replies to the sender to receive the response.

(3) If the receiver (user terminal 2, which is a roaming user terminal) is a user terminal of another office MCX system 1, then the sender office MCX system 1 sends a point-to-point short data service request to the receiver's home office MCX system; The MCX system of the party’s home office finds that the receiver has roamed, and sends a redirection response to the sender’s MCX system 1, which contains the address information of the receiver’s roaming office MCX system 2; the sender’s office MCX system 1 analyzes the receiver’s roaming office MCX Address information of system 2, and resend the point-to-point short data request to the receiver's roaming office MCX system 2.

(4) The recipient's roaming office MCX system 2 forwards the request to the recipient. After receiving the request, the recipient sends a response to the calling office MCX system 1 via the receiver's roaming office MCX system 2 .

C22. During peer-to-peer file transfer:

(5) If the business sent by the sender is point-to-point file transmission, before step (1), upload the file to the MCX system 1 of the sender's office, and store it after receiving the file, and reply to upload the file Response, which carries the storage address information of the file.

(6) For the file transfer business, the transfer of information such as file storage address and file description is completed through the aforementioned steps (1) to (4). Of course, the content of the request is also correspondingly changed to a point-to-point file transfer request.

(7) For file transfer business, after step (4), the receiver will send a file download request to the sender office MCX system 1 according to the file storage address, and the sender office MCX system 1 will reply to the file download after receiving the download request Response, which carries the specific content of the file.

4. Group data service.

When the service of the current user terminal is a group data service, it includes: the current user terminal is a roaming user terminal, and serves as a sender of a group data service and a receiver of a group data service, and in each case through the The MCX system of the roaming office performs service roaming processing; among them, the group data service includes two types of sub-services: group short data and group file transmission.

D1. The current user terminal serves as the sender of the group short data.

For the group short data sub-service, the current user terminal, as the sender, initiates a group short data service request to the MCX system of the roaming office; after receiving the group short data service request, the MCX system of the roaming office verifies the sender’s relevant permissions and parses out The receivers in the group, and reply to the sender to receive a response, wherein, the receivers in the group are all user terminals; the MCX system of the roaming office sends group short data service requests to the receivers in the group one by one; the group After receiving the group short data request, the receiver in the group will reply to the MCX system of the roaming bureau to receive a response. In the group short data sub-service, the group short data service request carries the corresponding short data content. Therefore, after receiving the point-to-point short data request, the receivers in the group can directly display the corresponding short data content.

For the group file transfer sub-service, the current user terminal acts as the sender, firstly, uploads the file to the MCX system of the roaming office, and the MCX system of the roaming office stores the file after receiving it, and returns a file upload response, which carries the storage address information of the file; Then, through the group short data sub-service, the MCX system of the roaming office transmits the file storage address information to the recipients in the group; after that, the recipients in the group send the files to the MCX system of the roaming office according to the file storage address information. Send a file download request, and the MCX system of the roaming office will reply a file download response containing the file content to the recipients in the group.

As shown in Figure 11, the processing flow when the user terminal acts as a group data sender mainly includes:

D11, group short data.

(1) User terminal a1 (the sender, which is a roaming user terminal) initiates a group short data service request to MCX system A of the roaming office.

(2) After receiving the request, MCX system A of the roaming office verifies the relevant authority of the sender and analyzes the member information of the group receiver; after the verification is passed, the MCX system of the roaming office replies to the sender with a group short data reception response.

(3) According to the member information of the group receiver, the MCX system of the roaming office sends group short data requests to receiver 2 (user terminal a2) and receiver 3 (user terminal b3) one by one; receiver 2 is a local user (that is, belongs to MCX system A) can directly send group short data requests; receiver 3 belongs to other MCX systems, and needs to send group short data requests to user terminal b3 through its corresponding home office MCX system B. An example of two receivers is provided here, and the number of receivers needs to be determined according to actual conditions in actual applications.

(4) After receiving the request, the receiver replies to the MCX system of the roaming bureau to receive the response.

D12, group files.

(5) If the business sent by the initiator is a group file, upload the file to the MCX system of the roaming office before step (1). The MCX system of the roaming office will store the file after receiving it, and reply the file upload response, which contains The storage address information of the file.

(6) In the file transfer business, the process of steps (1) to (4) mainly completes the transfer of information such as file storage address and file description. Of course, the request content is also correspondingly changed into a point-to-point file transfer request.

(7) For the file transfer service, after step (4), the group receiver 2 and receiver 3 will send a file download request to the MCX system of the roaming office according to the file storage address. After the MCX system of the roaming office receives the download request, Reply with a file download response, which carries the specific content of the file.

D2. The current user terminal serves as the receiver of the group short data.

For the group short data sub-service, the current user terminal is the receiver, and the receiver is a roaming user terminal; the MCX system of the receiver's roaming office receives the group short data service request sent by the sender's office MCX system, and returns a reception response. Of course, a series of processing procedures for the sender are also included before this. The sender here is the user terminal, and the MCX system of the sender's office is the MCX system where the sender is located, that is, the MCX system of the sender's home office (no roaming occurs) or the MCX system of the roaming office of the sender (roaming occurs).

For the group file transmission sub-service, the current user terminal, as the receiver, receives the file storage address information transmitted by the MCX system of the sender office through the group short data sub-service; The office MCX system sends a file download request to the sender office MCX system, and then receives a file download response containing file content from the sender office MCX system via the roaming office MCX system. Of course, before this, the process of uploading files by the sender is also included.

As shown in Figure 12, the processing flow when the user terminal (specifically user terminal b3 in Figure 12) acts as a group data receiver mainly includes:

D21, group short data.

(1) User terminal 1 (sender) initiates a group data service request to the MCX system of the sender's office.

(2) After receiving the request, the MCX system of the sender office verifies the relevant permissions of user terminal 1 and analyzes the receiver information in the group; after the verification is passed, the MCX system of the sender office replies to the sender user terminal 1 group Short data receive response.

(3) The MCX system of the sender office sends a group short data request to the receivers in the group; the receiver 2 (ie user terminal a2) is a user terminal belonging to the MCX system A of the sender office, therefore, the group short data request is sent directly Short data request; for receiver 3 (user terminal b3), if it is found that the roaming office MCX system of receiver 3 is the sender office MCX system A, it will directly send a group short data request to receiver 3; if receiver 3 does not When roaming occurs, send a group short data request to recipient 3 through the receiver 3's home office MCX system B; if the receiver 3's roaming office MCX system is not the sender's MCX system A, but roams to other roaming offices The MCX system H, after being redirected by the MCX system of the home office of the recipient 3, sends a group short data request to the recipient 3 through the MCX system H of the recipient 3's roaming office.

(4) After receiving the request, the receiver replies to the MCX system of the roaming bureau to receive the response.

D22, group files.

(5) If the business sent by user terminal 1 is a group file, before step (1), upload the file to the MCX system of the sender office, and the MCX system of the sender office will store the file after receiving it, and reply with a file upload response , which carries the storage address information of the file.

(6) In the file transfer business, the process of steps (1) to (4) mainly completes the transfer of information such as file storage address and file description. Of course, the request content is also correspondingly changed into a point-to-point file transfer request.

(7) For file transfer business, after step (4), receiver 2 and receiver 3 in the group will send a file download request to the MCX system of the sender office according to the file storage address, and the MCX system of the sender office will receive After the download request, reply the file download response, which carries the specific content of the file.

Through the above description of the implementation manners, those skilled in the art can clearly understand that the above embodiments can be implemented by software, or by means of software plus a necessary general-purpose hardware platform. Based on this understanding, the technical solutions of the above embodiments can be embodied in the form of software products, which can be stored in a non-volatile storage medium (which can be CD-ROM, U disk, mobile hard disk, etc.), including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute the methods described in various embodiments of the present invention.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person familiar with the technical field can easily conceive of changes or changes within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (9)

1. A method for roaming of railway 5G private network MCX cluster communication services, characterized in that, comprising: The user terminal realizes roaming awareness across offices according to the change of the current IP address; When the user terminal perceives the occurrence of cross-office roaming, it obtains the IP address of the MCX system of the roaming office, and completes the registration process with the MCX system of the roaming office through the IP address of the MCX system of the roaming office; wherein, the MCX system is a key business communication system ; After the user terminal completes the registration process with the MCX system of the roaming office, the MCX system of the roaming office performs service roaming processing according to the situation of the user terminal during the service process; Wherein, when the user terminal perceives that cross-office roaming occurs, the IP address of the roaming office MCX system is obtained, and the steps of completing the registration process to the roaming office MCX system through the IP address of the roaming office MCX system include: When the user terminal perceives the occurrence of cross-office roaming, it queries the IP address of the MCX system of the roaming office according to the general domain name of the MCX system; initiates initial configuration, user authentication, token acquisition, and configuration to the MCX system of the roaming office according to the IP address of the MCX system of the roaming office Obtain and register an authorization request; where token is a token; After receiving the request, the MCX system of the roaming office will reply the initial configuration response, and judge whether to enable the roaming registration process; if it is determined that the user terminal is a roaming user terminal and the registration has not been completed, then enable the registration process of the roaming user terminal; The MCX system of the roaming office forwards user authentication, token acquisition and configuration acquisition requests to the MCX system of the home office corresponding to the user terminal through the inter-system interface, and receives a response from the MCX system of the home office; The MCX system of the roaming office forwards the response to the user terminal, and stores the token and configuration information carried in the response; If the response returned by the MCX system of the home office indicates that the user authentication is passed, the user terminal completes the registration in the MCX system of the roaming office. 2. A method for roaming of railway 5G private network MCX cluster communication services according to claim 1, characterized in that, the realization of cross-office roaming perception by the user terminal according to the change of the current IP address includes: After receiving the current IP address, the user terminal perceives whether inter-office roaming occurs according to changes in the current IP address; The current IP address includes: a DNS server IP address and a user terminal IP address, and when the DNS server IP address or the user terminal IP address changes, it is determined that inter-office roaming occurs; wherein, DNS is a domain name system. 3. The method for roaming of a railway 5G private network MCX cluster communication service according to claim 2, wherein the receiving of the current IP address by the user terminal includes: The user terminal leaves the 5G network coverage of the previous railway bureau, moves into the 5G network coverage of the roaming bureau, and completes the 5G network connection and registration process of the roaming bureau; this part indicates that the user terminal roams across bureaus; If the user terminal is currently in a business process, keep the previously allocated PDU session and IP address unchanged; if the user terminal is in a service idle state, notify the user terminal to complete the establishment of the roaming office PDU session; wherein, the PDU is a protocol data unit; After the roaming office PDU session is established, the user terminal receives the current IP address issued by the roaming office. 4. A method for roaming of railway 5G private network MCX cluster communication services according to claim 1, characterized in that, the method also includes: the logout process of the user terminal in the MCX system of the roaming office, the steps include: When the user terminal leaves the roaming office or actively initiates a logout, it initiates a logout request to the MCX system of the roaming office; The MCX system of the roaming office completes the logout of the user terminal and sends a response to the user terminal according to the received logout request; or, if the user terminal fails to register and keep alive after the time limit, the MCX system of the roaming office actively cancels the user terminal; After completing the deregistration of the user terminal, the MCX system of the roaming office sends a user terminal deregistration notification to the MCX system of the user terminal's home office. 5. A method for roaming MCX trunking communication services on a railway 5G private network according to claim 1, wherein the services of the user terminal include: individual call service, group call service, point-to-point data service and group call service of the user terminal data business. 6. A method for roaming of MCX trunking communication services on a railway 5G private network according to claim 1 or 5, characterized in that, the MCX system of the roaming office performs service roaming processing according to the role of the user terminal in the service process include: When the service of the current user terminal is a private call service, including the situation that the current user terminal is used as a private call caller and a private call, the current user terminal is a roaming user terminal, and in each case, it is performed through the MCX system of the roaming office. Service roaming processing; the current user terminal is a roaming user terminal means that the current user terminal has completed the registration process with the roaming office MCX system; When the current user terminal is used as an individual call, it is called the calling user terminal, and the calling user terminal initiates a private call service request to the MCX system of the roaming office; after receiving the individual call service request, the MCX system of the roaming office verifies the calling user terminal relevant authority, and parse out the called user terminal; send an individual call request to the called user terminal via the called office MCX system; wherein, the called office MCX system is the MCX system where the called user terminal is located, that is, the called user The MCX system of the home office of the terminal or the MCX system of the roaming office of the called user terminal; after receiving the individual call request, the called user terminal replies with a connected call response or a rejection response; if it replies with a connected call response, the roaming office MCX system replies Calling user terminal connection response; When the current user terminal is called as an individual call, it is called the called user terminal, and the roaming office MCX system of the called user terminal receives an individual call service request from the calling office MCX system, wherein the calling office MCX system is The MCX system where the calling user terminal is located is the home office MCX system of the calling user terminal or the roaming office MCX system of the calling user terminal. The MCX system of the roaming office, and then initiates an individual call service request to the MCX system of the roaming office of the called user terminal; after receiving the individual call request, the called user terminal replies with a connected call response or a rejection response; if it returns a connected call response, Then, the called user terminal connect response is replied via the MCX system of the roaming office. 7. A method for roaming of MCX trunking communication services on a railway 5G private network according to claim 1 or 5, wherein the roaming process is performed through the MCX system of the roaming office according to the role of the user terminal in the service process include: When the service of the current user terminal is a group call service, including the situation that the user terminal is used as a group call caller and a group call called, the current user terminal is a roaming user terminal, and in each case, the service is performed through the roaming office MCX system Roaming processing; the current user terminal is a roaming user terminal means that the current user terminal has completed the registration process with the roaming office MCX system; When the current user terminal is used as a group call caller, it is called the calling user terminal, and the calling user terminal initiates a group call service request to the MCX system of the roaming office; after receiving the group call service request, the MCX system of the roaming office verifies the calling user terminal relevant authority, and analyze the group call called member information, the group call called members are all called user terminals; after the verification is passed, the MCX system of the roaming office will reply the calling user terminal to connect the group call response; and according to the group call Call the called member information, send a group call request to the called user terminal one by one, and pull the called user terminal into the group call one by one; When the current user terminal is called as a group call, it is called the called user terminal. The MCX system of the roaming office of the called user terminal receives a group call service request from the calling office MCX system and is pulled into the group call. 8. A method for roaming of MCX trunking communication services on a railway 5G private network according to claim 1 or 5, characterized in that, the MCX system of the roaming office performs service roaming processing according to the role of the user terminal in the service process include: When the service of the current user terminal is a point-to-point data service, it includes: the current user terminal is a roaming user terminal, and serves as a point-to-point data sender and a point-to-point data receiver. In each case, it is performed through the roaming office MCX system Service roaming processing; among them, the point-to-point data service includes two types of sub-services, point-to-point short data and point-to-point file transmission; the current user terminal is a roaming user terminal, which means that the user terminal has completed the registration process with the roaming office MCX system; When the user terminal acts as a point-to-point data sender, the process of performing service roaming processing of the two types of sub-services through the roaming office MCX system includes: For the point-to-point short data sub-service, the current user terminal, as the sender, initiates a point-to-point short data service request to the MCX system of the roaming office, and the point-to-point short data service request carries the corresponding short data content; the MCX system of the roaming office receives the point-to-point short data service After the request, verify the sender's relevant permissions, analyze the receiver, and reply to the sender to receive a response; then send a point-to-point short data request to the receiver through the MCX system of the receiver's office; where the receiver is a user terminal, and the receiver's office The MCX system is the receiver's MCX system, that is, the receiver's home office MCX system or the receiver's roaming office MCX system; after receiving the point-to-point short data request, the receiver replies to the roaming office MCX system to receive a response; For the point-to-point file transfer sub-service, the current user terminal acts as the sender, first, uploads the file to the MCX system of the roaming office, and the MCX system of the roaming office stores the file after receiving it, and returns a file upload response, which contains the storage address information of the file; then , through the point-to-point short data sub-service, the MCX system of the roaming office transmits the file storage address information to the receiver; after that, the receiver sends a file download request to the MCX system of the roaming office according to the file storage address information, and the MCX system of the roaming office sends a file download request to the MCX system of the roaming office. The receiver replies with a file download response containing the file content; When the current user terminal is used as a point-to-point data receiver, the processes for the two types of sub-services to perform service roaming processing through the roaming office MCX system include: For the point-to-point short data sub-service, the current user terminal is the receiver; the receiver’s roaming office MCX system receives the request from the sender’s office MCX system to initiate the point-to-point short data sub-service request, wherein the sender’s office MCX system first passes the receiver’s The office MCX system obtains the receiver's roaming office MCX system, and then initiates a point-to-point short data sub-service request to the receiver's roaming office MCX system; after the receiver receives the point-to-point short data service request, it sends to The MCX system of the sender's office replies and receives the response; the sender is a user terminal, and the MCX system of the sender's office is the MCX system where the sender is located, that is, the MCX system of the sender's home office or the MCX system of the sender's roaming office; For the point-to-point file transmission sub-service, the current user terminal, as the receiver, receives the file storage address information transmitted by the MCX system of the sender office through the point-to-point short data sub-service; The MCX system of the roaming office sends a file download request to the MCX system of the sender office, and then receives a file download response containing file content from the MCX system of the sender office via the MCX system of the receiver's roaming office. 9. A method for roaming of MCX trunking communication services on a railway 5G private network according to claim 1 or 5, characterized in that, the MCX system of the roaming office performs service roaming processing according to the role of the user terminal in the service process include: When the service of the current user terminal is a group data service, it includes: the current user terminal is a roaming user terminal, and serves as a sender of a group data service and a receiver of a group data service, and in each case through the The MCX system of the roaming office performs service roaming processing; among them, the group data service includes two types of sub-services: group short data and group file transmission; the current user terminal is a roaming user terminal means that the user terminal has completed the registration process with the roaming office MCX system ; When the current user terminal is used as a group short data sender, the process of performing service roaming processing of the two types of sub-services through the roaming office MCX system includes respectively: For the group short data subservice, the current user terminal, as the sender, initiates a group short data service request to the MCX system of the roaming office, and the group short data service request carries the corresponding short data content; the MCX system of the roaming office receives the group short data service request. After the group short data service request, verify the relevant permissions of the sender, analyze the receivers in the group, and reply to the sender to receive a response. Among them, the receivers in the group are all user terminals; the MCX system of the roaming office sends The receivers in the group send a group short data service request; after receiving the group short data request, the receivers in the group reply to the MCX system of the roaming bureau to receive a response; For the group file transfer sub-service, the current user terminal acts as the sender, firstly, uploads the file to the MCX system of the roaming office, and the MCX system of the roaming office stores the file after receiving it, and returns a file upload response, which carries the storage address information of the file; Then, through the group short data sub-service, the MCX system of the roaming office transmits the file storage address information to the recipients in the group; after that, the recipients in the group send the file storage address information to the MCX system of the roaming office For a file download request, the MCX system of the roaming office will reply a file download response containing the file content to the recipients in the group; When the current user terminal is used as a group short data receiver, the process of performing service roaming processing of the two types of sub-services through the roaming office MCX system includes: For the group short data sub-service, the current user terminal is the receiver; the group short data service request sent by the sender's office MCX system is received through the MCX system of the receiver's roaming office, and a reply is received; the sender is the user terminal, and the sender The office MCX system is the MCX system where the sender is located, that is, the sender's home office MCX system or the sender's roaming office MCX system; For the group file transmission sub-service, the current user terminal, as the receiver, receives the file storage address information transmitted by the MCX system of the sender office through the group short data sub-service; The office MCX system sends a file download request to the sender office MCX system, and then receives a file download response containing file content from the sender office MCX system via the roaming office MCX system.

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