Digital talkback method and system based on GSM-R (Global System for Mobile Communications-Railway) network

Abstract

The invention provides a digital talkback method and system based on a GSM-R network, on the basis of the GSM-R network, a digital talkback control subsystem and a voice conference subsystem are added, the digital talkback control subsystem is accessed to a GPRS network, and a conference switch is accessed to an SSS of the GSM-R network through a PRI relay. The mobile terminal is attached to a GPRS to be connected with the digital talkback control server, and after registration succeeds, whether group information is updated or not is judged. And the mobile terminals select to wait for any group. And the mobile terminal initiates and calls the current waiting group, and the digital talkback control server controls the conference switch to call the members of each group for conference conversation. And the digital talkback control server is connected with the network management server and is used for managing the mobile terminals and corresponding users. The coverage advantage of the GSM-R network is exerted, and group calling numbers are randomly distributed according to user types, professions, scenes and the like based on the GPRS network. Air interface group writing is realized, the talkback terminal does not need to write frequency in advance, and group configuration is issued by a system background. The group calling range is not limited, and single-station, interval and whole-network calling can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of railway digital mobile communication, in particular to a digital intercom system based on GSM-R network for railway maintenance and repair, production organization, emergency guarantee. BACKGROUND

[0002] GSM-R is a comprehensive special digital mobile communication system specially designed for railway communication, belonging to the second generation of railway digital mobile communication system, and the newly built railway and the reconstructed railway in China basically adopt GSM-R network. GSM-R network is mainly used for train dispatching, and has a group call function itself, but due to the nature of railway train dispatching, GSM-R group call cannot be grouped arbitrarily according to the profession (such as engineering, signal, power supply, etc.), and cannot be arbitrarily communicated between multiple base stations (stations). It is not convenient for users of railway maintenance and repair, production organization, emergency guarantee. At the same time, GSM-R group call must use railway GSM-R network special terminal, which is relatively high in price. SUMMARY

[0003] The present application provides a digital intercom system method based on GSM-R network, which solves the problem that the prior art GSM-R group call cannot be arbitrarily grouped according to the profession, and cannot be arbitrarily communicated between multiple stations, and also solves the problem that GSM-R group call must use railway GSM-R network special terminal, which is relatively high in price. Therefore, the present application provides a digital intercom system method based on GSM-R network, which realizes flexible grouping and voice intercom function of mobile terminal based on GSM-R network, supports single station communication, intercommunication and network communication of multiple mobile terminals, solves the communication problem of engineering, signal, power supply and maintenance and repair operation, and meets the operation needs of railway engineering, signal, power supply and other business departments maintenance and repair, production organization, emergency guarantee and the like.

[0004] In order to achieve the above purpose, the technical scheme of the present application provides a digital intercom method based on GSM-R network, comprising: a digital intercom control subsystem and a voice conference subsystem, the digital intercom control subsystem is connected to GPRS network, and the conference switch of the voice conference subsystem is connected to SSS of GSM-R network through PRI relay; The mobile terminal is attached to the digital intercom control server in the digital intercom control subsystem, and after successful registration, the digital intercom control server judges whether to update group information; a plurality of mobile terminals select to wait for any group; the mobile terminal makes a call, and the intercom server controls the conference switch to call group members for conference communication.

[0005] Preferably, the registration success comprises: the digital intercom control server performing legality verification on the number of the terminal and the hash value of the terminal home group, and responding with a registration success response after verification.

[0006] Preferably, the digital intercom control server judges whether to update group information, comprising: the digital intercom control server judging whether the hash value of the network management configured group is consistent with the hash value reported by the mobile terminal, and issuing a group update instruction if the hash values are inconsistent, and the mobile terminal can select any one group from the updated group information to standby.

[0007] Preferably, the standby of any group comprises: the mobile terminal registering and obtaining the group number belonging to the mobile terminal from the intercom server through a UDP channel, and selecting any one group to standby in a group attachment mode, and notifying the digital intercom control server of the current standby group through the UDP channel, and the server saving the mobile terminal as a member of the standby group in the local.

[0008] Preferably, any of the mobile terminals makes a group call in the current standby group, the digital intercom control server queries all members of the group locally, and notifies the conference switch to establish a group call; after the conference switch establishes the group call, the mobile terminals in the same group are called to join the conference in the GSM-R network environment.

[0009] Preferably, any of the mobile terminals makes a group call in the current standby group, comprising: the mobile terminal initiating a group call of the current standby group, and the call information of the mobile terminal being notified to the intercom control server through a UDP channel, and the intercom control server querying all standby group members of the group after receiving the call information, and notifying the voice conference subsystem to uniformly initiate a call to the members.

[0010] The application also provides a digital intercom system based on a GSM-R network, comprising a digital intercom control subsystem, a conference subsystem and a mobile terminal. The digital intercom control server in the digital intercom control subsystem is directly connected with the mobile terminal through a first interface, the digital intercom control server is connected with a conference switch in the conference subsystem through a second interface, the digital intercom control server is connected with a network management server through a third interface, and the conference switch is connected with the GSM-R network through an RPI. The digital intercom control subsystem controls the voice conference subsystem to perform voice exchange, and realizes call establishment and voice interaction.

[0011] The mobile terminal is typically located in a GSM-R network environment.

[0012] As a preferred embodiment of the above technical solution, the first interface is used to establish a UDP channel with the digital intercom control server based on GPRS for transmitting call signaling and data.

[0013] As a preferred embodiment of the above technical solution, the second interface is used to establish a UDP channel between the intercom control server and the conference switch based on the wired IP network, for transmitting conference control signaling.

[0014] As a preferred embodiment of the above technical solution, the third interface is used to establish a UDP channel between the intercom control server and the network management system based on the wired IP network, for transmitting network management signaling.

[0015] This invention provides a digital intercom method and system based on a GSM-R network. The digital intercom control subsystem is connected to the GPRS network, and the conference switch of the voice conferencing subsystem is connected to the SSS of the GSM-R network via a PRI trunk. Mobile terminals attach to GPRS and connect to the digital intercom control server in the digital intercom control subsystem through a first interface. After successful registration, the digital intercom control server determines whether to update group information. Several mobile terminals select to monitor any group and initiate a call. The digital intercom control server controls the conference switch to conduct the conference call through a second interface. The digital intercom control server connects to a network management server through a third interface for managing mobile terminals and corresponding users.

[0016] The advantages of this invention are that it fully leverages the coverage advantages of the GSM-R network to achieve coverage of the entire railway line. Based on the GPRS network, it enables flexible grouping, assigning multiple group call numbers according to user type, different professions, and usage scenarios, with calls between groups not interfering with each other. It utilizes the GPRS network for over-the-air group writing, eliminating the need for pre-programming frequencies to the intercom terminal; group configurations can be distributed from the system backend. Leveraging the characteristics of the GSM-R network, it achieves unrestricted group call range, enabling single-station calls, inter-regional calls, and network-wide calls. The mobile terminal uses a more universal GSM module to operate on both GPRS and GSM-R networks, eliminating the need for a dedicated GSM-R module. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This invention provides an architecture diagram of a digital intercom system based on a GSM-R network.

[0019] Figure 2 A flowchart of a digital intercom method based on a GSM-R network provided by the present invention.

[0020] Figure 3 The present invention provides a flowchart of the mobile terminal registration, group update, and group attachment signaling process in a digital intercom method based on a GSM-R network.

[0021] Figure 4 The present invention provides a flowchart of group call signaling in a digital intercom method based on a GSM-R network.

[0022] Figure 5 The interface block diagram of the digital intercom system based on the GSM-R network provided by the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The present invention will now be described in detail as a digital intercom method based on a GSM-R network. Figure 2 This is a schematic diagram of a process provided for an embodiment of the present invention, such as... Figure 2 As shown, this embodiment provides, including: First, the digital intercom server notifies the conference switch of the voice conferencing subsystem to access the SSS of the GSM-R network via PRI trunk.

[0025] Step 101: The mobile terminal attaches to the digital intercom control server in the GPRS connection digital intercom control subsystem and registers therein.

[0026] Step 102: If registration is successful, the hash value is validated. If successful, it is determined whether to update the group information.

[0027] After successful registration, the digital intercom control server verifies the validity of the terminal's number and the hash value of the terminal's home group. If the verification is successful, it will respond with a registration success message.

[0028] Step 103: The digital intercom control server determines whether to update the group information.

[0029] The digital intercom control server determines whether the hash value of the network management configuration group is consistent with that reported by the mobile terminal. If they are inconsistent, it issues a group update command. After updating the group information, the home group saved by the mobile terminal is consistent with the current configuration group of the mobile terminal recorded by the digital intercom control server.

[0030] Step 104: Several mobile terminals select any group to wait.

[0031] After registration, the mobile terminal obtains the group number it belongs to from the intercom server via a UDP channel. It can select any group to watch in a group-attached manner and notify the digital intercom control server of the currently watched group via a UDP channel. The server then saves the mobile terminal locally as a member of the watched group.

[0032] A configuration group refers to a collection of multiple groups that an administrator may configure a mobile terminal to use through a management terminal. A watch group refers to a terminal selecting one of these groups to watch.

[0033] Step 105: The mobile terminal makes a call, and the intercom server notifies the conference switch of the voice conferencing subsystem to establish a conference call by accessing the SSS of the GSM-R network through the PRI trunk.

[0034] The mobile terminal initiates a group call for the current waiting group. Its call information is notified to the intercom control server through the UDP channel. After receiving the call, the intercom control server queries all the waiting group members locally and notifies the voice conferencing subsystem to initiate calls to the mobile terminals of these members in a unified manner. Then, the call is conducted in the GSM-R network.

[0035] The digital intercom system based on the GSM-R network provided by this invention adds a digital intercom control subsystem and a voice conferencing subsystem to the existing GSM-R network. The digital intercom control subsystem is responsible for signaling exchange and data processing, accesses the GPRS network via IP, and controls the voice conferencing subsystem for voice exchange. The voice conferencing subsystem accesses the GSM-R network's SSS via a PRI trunk, ultimately achieving call establishment and voice interaction. The system architecture is as follows: Figure 1 As shown: The digital intercom control subsystem mainly includes a digital intercom control server and a network management server. The digital intercom control server is the core switching control part of the GSM-R network digital intercom, responsible for resource management, user registration, signaling interaction and cluster services, etc. The network management server has a built-in data center and is responsible for user management, parameter setting, network monitoring, system maintenance, etc.

[0036] The voice conferencing subsystem includes a voice conferencing switch, which is responsible for establishing voice conferences for each group by making individual calls to each group member.

[0037] The mobile terminal is a new type of walkie-talkie terminal equipped with a GSM module and supporting PTT.

[0038] The technical solution of the present invention will now be described in further detail: Based on the existing GSM-R network, this application adds a digital intercom control subsystem and a voice conferencing subsystem. The digital intercom control subsystem is responsible for signaling exchange and data processing, accesses the GPRS network, and controls the voice conferencing subsystem to perform voice exchange. The voice conferencing subsystem accesses the SSS of the GSM-R network through the PRI trunk to realize call establishment and voice interaction.

[0039] 1. The intercom control subsystem management terminal performs user group management in the GPRS network environment. The system assigns multiple group call numbers according to user type, different professions, and usage scenarios. Each user can be assigned to multiple group calls as a group member.

[0040] 2. Provide a mobile terminal with digital intercom functionality for use on the GSM-R network. Upon power-on, the terminal will automatically attach to the GPRS network, establish a UDP-IP connection with the intercom server, and register with the intercom control server. A GSM module will be installed in the digital intercom terminal to enable GSM-R network access.

[0041] 3. After the mobile terminal is registered, it obtains the group number it belongs to from the intercom server through the UDP channel. The user can select the group to watch and notify the digital intercom control server through the UDP channel. The server saves all the group members currently watching the group.

[0042] 4. The mobile terminal initiates a group call for the current waiting group. Its call information is notified to the digital intercom control server through the UDP channel. After receiving the call, the digital intercom control server queries all waiting group members and notifies the voice conferencing subsystem to initiate unified calls to these member mobile terminals based on the GSM-R network.

[0043] 5. The voice conferencing subsystem establishes a group call conference and calls each group member one by one. The called terminal automatically answers and joins the conference.

[0044] Now, each mobile terminal can speak via PTT, enabling real-time voice communication between multiple terminals in the GMS-R network environment.

[0045] The technical solution of the present invention will now be described in conjunction with specific embodiments, such as... Figure 3 As shown: The current system network management is configured with two groups: Engineering Group 901 and Electrical Group 902; four mobile stations MS1, MS2, MS3 and MS4 are opened, and each mobile station can choose to guard Group 901 and 902.

[0046] First terminal MS1 is powered on ( Figure 3In practice, MS (which can be MS2, MS3, MS4, or MSN, where N is a natural number) attaches to the GPRS connection and intercom control server. After attaching, it sends a registration signal ①, carrying the mobile phone number and the hash value of the group to which terminal MS1 belongs. The digital intercom control server verifies the validity and responds with a registration success response ②. The digital intercom control server checks whether the hash value of the network management configuration group matches the one reported by the terminal. If they do not match, it issues a group update command ③. Upon receiving the command, the terminal updates group information 901 and 902 and responds with a group update response ④. Terminal MS1 selects to wait in group 901 and sends a group attach command to the server ⑤. The server receives the command, records that terminal MS1 is waiting in group 901, and responds with a group attach command ⑥. The flowchart of MS1's power-on registration, configuration group update, and group attach signaling is as follows: Figure 3 As shown. The home group is stored on the terminal.

[0047] Similarly, MS2 and MS3 wait for group 901 after powering on, while MS4 waits for group 902 after powering on.

[0048] The terminal makes a call as follows: Terminal MS1 calls group 901. ① It sends a group call request to the digital intercom server, carrying its own number and group number. The digital intercom server receives the request, verifies the validity of the calling number and the called group number, and queries all members of the group. ② It notifies the conference switch in the GSM-R network to establish a conference (group call), carrying the group number and member numbers MS1, MS2, and MS3. The conference switch creates the conference and calls MS2, MS3, and MS1 to join the conference, while simultaneously responding to the digital intercom server that the conference creation was successful. ③ The digital intercom server responds that MS1's call was successful. ④ The above group call signaling process is as follows. Figure 4 As shown.

[0049] During a call: MS1, MS2, and MS3 receive a call from the conference switch and automatically answer and enter the conference. If they want to speak, they press the PTT key. If they want to end the call, MS1 hangs up directly.

[0050] Furthermore, to achieve signaling exchange and control of digital intercom in the above method, this invention provides a digital intercom system based on a GSM-R network, including a digital intercom control subsystem, a conference subsystem, and a mobile terminal, such as... Figure 5 As shown.

[0051] The digital intercom control server in the digital intercom control subsystem is directly connected to the mobile terminal through the first interface F. The digital intercom control server is connected to the conference switch in the conference subsystem through the second interface C. The digital intercom control server is connected to the network management server through the third interface M. The conference switch is connected to the GSM-R network through RPI.

[0052] The first interface F is used to establish a UDP channel with the digital intercom control server based on GPRS, for transmitting call signaling and data.

[0053] The second interface C is used to establish a UDP channel between the intercom control server and the conference switch based on the wired IP network, for transmitting conference control signaling.

[0054] The third interface M is used to establish a UDP channel between the intercom control server and the network management system based on the wired IP network, for transmitting network management signaling. The interface block diagram is as follows: Figure 5 As shown.

[0055] Furthermore, the first interface F is used to establish a connection between a mobile terminal, typically located in a GSM-R network environment, and the digital intercom control server via the GPRS network. The second interface C is used to establish a UDP channel for transmitting control messages between the digital intercom control server and the conference switch, including call setup, group member online / offline notifications, etc., thereby enabling the digital intercom control subsystem to control the voice conferencing subsystem for voice exchange. The voice conferencing subsystem accesses the GSM-R network's SSS via a PRI trunk to achieve call setup and voice interaction.

[0056] Based on the GSM-R network, this invention incorporates the concept of trunking communication and realizes group management and call control of mobile terminals based on the GPRS data transmission channel. Without affecting the wireless train dispatching, it utilizes the voice resources of the GSM-R network to merge multiple individual voice calls into a single conference, forming a voice group call, and realizing digital intercom for GSM-R mobile terminals. This can meet the dispatching and command needs of railway maintenance, production organization, and emergency support.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A digital intercom method based on a GSM-R network, characterized in that, The method includes: a digital intercom control subsystem and a voice conferencing subsystem, wherein the digital intercom control subsystem is connected to a GPRS network, and the conference switch of the voice conferencing subsystem is connected to the SSS of the GSM-R network through a PRI trunk; The mobile terminal attaches a GPRS connection to the digital intercom control server in the digital intercom control subsystem. After successful registration, the digital intercom control server determines whether to update the group information. Several of the aforementioned mobile terminals select to wait in any group; The mobile terminal makes a call, and the intercom server controls the conference switch to call group members to conduct conference calls.

2. The intercom method according to claim 1, characterized in that, The successful registration includes, The digital intercom control server verifies the validity of the terminal's number and the hash value of the terminal's home group. If the verification is successful, it responds with a registration success message.

3. The intercom method according to claim 1, characterized in that, The digital intercom control server determines whether to update group information, including: The digital intercom control server determines whether the hash value of the network management configuration group is consistent with that reported by the mobile terminal. If they are inconsistent, it issues a group update command. After updating the group information, the mobile terminal can select any group to monitor. The configuration group is a set of groups that a mobile terminal may use.

4. The intercom method according to claim 1, characterized in that, The waiting group includes, After registration, the mobile terminal obtains its assigned group number from the intercom server via a UDP channel, selects any group to wait in a group-attached manner, and notifies the digital intercom control server of the currently waiting group via a UDP channel. The server then saves the mobile terminal locally as a member of the waiting group. The waiting group refers to the group that the terminal belongs to when it selects a group to wait in this configured group.

5. The intercom method according to claim 1, characterized in that, This includes the following: any of the mobile terminals makes a group call within the current waiting group; the digital intercom control server queries all members of the local group and notifies the conference switch to establish the group call; After the conference switch establishes a group call, mobile terminals within the same group are called to join the conference in the GSM-R network environment.

6. The intercom method according to claim 5, characterized in that, The mobile terminal makes a group call within the current waiting group. This includes the mobile terminal initiating a group call for the current waiting group, and the call information being notified to the intercom control server via a UDP channel. Upon receiving the notification, the intercom control server queries all waiting group members and notifies the voice conferencing subsystem to initiate unified calls to the mobile terminals of these members.

7. A digital intercom system based on a GSM-R network, characterized in that, This includes a digital intercom control subsystem, a conference subsystem, and a mobile terminal. The digital intercom control server in the digital intercom control subsystem is directly connected to the mobile terminal through a first interface. The digital intercom control server is connected to the conference switch in the conference subsystem through a second interface. The digital intercom control server is connected to the network management server through a third interface. The conference switch is connected to the GSM-R network through RPI. The digital intercom control subsystem controls the voice conferencing subsystem to perform voice exchange, enabling call establishment and voice interaction. The mobile terminal is typically located in a GSM-R network environment.

8. The intercom system according to claim 7, characterized in that, The first interface is used to establish a UDP channel with the digital intercom control server based on GPRS, for transmitting call signaling and data.

9. The intercom system according to claim 7, characterized in that, The second interface is used to establish a UDP channel between the intercom control server and the conference switch based on the wired IP network, for transmitting conference control signaling.

10. The intercom system according to claim 7, characterized in that, The third interface is used to establish a UDP channel between the intercom control server and the network management system based on the wired IP network, for transmitting network management signaling.

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