Subway Onboard Communication Device and Main MMI Audio / Video Stream Switching Control Method

Abstract

This invention relates to a subway vehicle-mounted communication device and a main MMI audio / video stream channel switching control method. The vehicle-mounted communication device includes a vehicle-mounted host and multiple operation display terminals (MMIs). The vehicle-mounted host is equipped with a switching board, a control board, and a service board. The MMIs are connected to the switching board, and the switching board is connected to both the control board and the service board. The service board and the MMIs are respectively equipped with an Ethernet-based internal interface processing module and an MMI interface processing module. The internal interface processing module and the MMI interface processing module are respectively equipped with service board media stream ports and MMI media stream ports. Compared with existing technologies, this invention adopts a full Ethernet architecture. Audio and video streams are exchanged within the device in the form of IP packets between the individual boards. The control board only participates in control and does not require changes to its hardware and software, providing strong flexibility and scalability, and improving voice communication quality.

Description

Technical Field

[0001] This invention relates to the field of subway communication network technology, and in particular to a control method for switching the main MMI audio and video stream channels of a subway onboard communication device. Background Technology

[0002] With the integration of wireless broadband communication technology with vertical industries, the subway industry is actively promoting the development and application of LTE-M / 5G technology. Subway onboard communication devices need to support broadband services such as LTE-M / 5G on top of supporting existing narrowband services such as Tetra / GSM. This is a major trend in the development of subway industry dispatch communication services.

[0003] For example, the scheme disclosed in Chinese patent application CN200510078272.4 is that the existing on-board equipment of the subway is mainly designed for narrowband dispatch communication services such as Tetra / GSM. It adopts a hardware architecture such as narrowband bus and analog audio. In the existing architecture, the switching of audio stream channels from each service board to the operation display terminal MMI is mainly based on the switching command issued by the MMI. The control board switches the audio stream channels by opening or closing the corresponding audio channel switches on its own board. As for the switching of video stream channels from each service board to the main MMI, due to the limitations of the existing device design architecture, it is impossible to realize LTE-M / 5G video communication functions, nor can it realize the switching control function of 5G video stream channels from each service board to the main MMI. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art by providing a subway vehicle-mounted communication device and a main MMI audio and video stream channel switching control method.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] As a first aspect of the present invention, a subway vehicle-mounted communication device is provided, the vehicle-mounted communication device including a vehicle-mounted host and multiple operation display terminals (MMIs); the vehicle-mounted host is provided with a switching board, a control board and a service board; the MMIs are connected to the switching board, and the switching board is connected to the control board and the service board respectively.

[0007] The service board and the MMI are respectively equipped with an Ethernet-based internal interface processing module and an MMI interface processing module; wherein the internal interface processing module and the MMI interface processing module are respectively equipped with a service board media stream port and an MMI media stream port.

[0008] Furthermore, the aforementioned

[0009] The control board also includes an Ethernet-based control board interface processing module and a control information processing module;

[0010] The control board interface processing module includes a control board network port driver, a control board IP layer, a control board broadcast port, and a control board control port.

[0011] Furthermore, the aforementioned

[0012] The service board also includes a service processing module connected to the service board interface processing module;

[0013] The service board interface processing module also includes a service board network port driver, a service board IP layer, a service board broadcast port, and a service board control port.

[0014] Furthermore, the service board is equipped with an external interface processing module, which is connected to an external system.

[0015] Furthermore, the service board is configured with multiple interfaces that are individually compatible with external systems.

[0016] Furthermore, the external systems matched with the multiple service boards include 5G networks, GSM networks, Tetra networks, and WIFI networks.

[0017] Furthermore, the MMI also includes a human-machine operation module and a media information processing module, which are respectively connected to the MMI interface processing module;

[0018] The MMI interface processing module also includes an MMI network port driver, an MMI IP layer, an MMI broadcast port, and an MMI control port.

[0019] Furthermore, there are two switching boards, which are cascaded together.

[0020] As a second aspect of the present invention, a method for switching the main MMI audio / video stream channel of a subway vehicle-mounted communication device is provided. The control method is applied to the subway vehicle-mounted communication device described above, and the steps include:

[0021] The human-machine operation processing module receives the request to enter the master control state input and generates a request master control message;

[0022] The MMI interface processing module sends the master control request message to the control board via the control channel through the switching board;

[0023] After receiving the request for master control message, the control board interface processing module forwards the message to the control information processing module;

[0024] The control information processing module modifies the master and slave control MMI indication information in the broadcast information, and sends the master and slave control MMI indication information to all service boards and MMIs through the broadcast channel via the switching board;

[0025] After receiving the master and slave control MMI indication information from the broadcast information via the MMI interface processing module, the human-machine operation processing module switches the master and slave control status.

[0026] After receiving the main and secondary control MMI indication information from the broadcast information through the internal interface processing module, the service flow processing module modifies the target IP address of the media stream port to the IP address of the main control MMI, and establishes an audio and video channel between the service board and the main control MMI with the participation of the switching board.

[0027] Furthermore, the aforementioned

[0028] When the vehicle communication device is powered on, the vehicle host and MMI start up;

[0029] The control information processing module reads the status information of the master and slave control MMIs for initialization and adds master and slave control MMI indication information to the broadcast message;

[0030] After receiving the instruction information from the primary and secondary control MMIs, the MMI enters the initial primary and secondary control state.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The subway onboard equipment is designed to meet the needs of converged communication for various dispatching and communication services. It adopts a full Ethernet architecture, and its audio and video streams are exchanged between various boards within the device in the form of IP packets. Therefore, the switching of audio and video stream channels from each service board to the main MMI is mainly based on the switching command issued by the MMI. Under the control of the control board, the corresponding information is broadcast to each communication service board. Each communication service board then switches to the main MMI's audio and video stream channel according to the main and auxiliary MMI information broadcast.

[0033] 1) For the implementation of the main MMI audio / video stream channel switching control function, the control board of the existing subway onboard device needs to perform the switching operation of the analog audio circuit channel switch on the control board under software control. Inside the subway onboard communication device, in the new implementation scheme, the control board only participates in the control function of the audio / video stream channel, and each communication service board performs its audio / video stream channel switching operation to the main MMI.

[0034] 2) The control method for switching the main MMI audio and video stream channels of the subway vehicle communication device reduces the hardware design complexity of the control board, allowing the control board to be mainly responsible for the logic control functions of the whole machine and not to participate in the processing of audio and video media. This makes the function definition of the control board clearer.

[0035] 3) Compared to existing subway onboard devices, the new device avoids audio quality degradation caused by merging multiple analog audio circuits on the control board hardware or excessively long analog audio lines. Therefore, the new implementation method also helps improve voice communication quality.

[0036] 4) Since the control board of the subway vehicle communication device does not participate in the processing of audio and video media, if a new communication service board needs to be added in the future, the implementation of the main MMI audio and video stream channel switching function does not require changes to the hardware and software of the control board. This has strong flexibility and scalability, and also helps to reduce the maintenance cost of the product. Attached Figure Description

[0037] Figure 1 This is a schematic block diagram showing the connection of the subway vehicle-mounted communication device of the present invention;

[0038] Figure 2 This is a schematic diagram of the vehicle-mounted communication device of the present invention;

[0039] The diagram shows the following components: 1. Vehicle Head Unit; 11. Switch Board; 12. Control Board; 121. Control Board Interface Processing Module; 1211. Control Board Network Port Driver; 1212. Control Board IP Layer; 1213. Control Board Broadcast Port; 1214. Control Board Control Port; 122. Control Information Processing Module; 13. Service Board; 131. Service Board Processing Module; 132. Internal Interface Processing Module; 1321. Service Board Network Port Driver; 1322. Service Board IP Layer; 1323. Service Board Broadcast Port; 1324. Service Board Control Port; 1325. Service Board Media Stream Port; 133. External Interface Processing Module; 2. MMI; 21. MMI Interface Processing Module; 211. MMI Network Port Driver; 212. MMI... IP layer, 213, MMI broadcast port, 214, MMI control port, 215, MMI media stream port, 22, human-machine operation processing module, 23, media information processing module. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0041] Example 1

[0042] like Figure 1 As shown in the diagram, the subway vehicle-mounted communication device of the present invention includes a vehicle-mounted host 1 and an MMI2. The vehicle-mounted host 1 is equipped with a switching board 11, multiple control boards 12, and several service boards 13. The MMI2 communicates with each control board 12 and service board 13 through the switching board 11.

[0043] Furthermore, the switching board 11 is connected to the control board 12 and the service board 13 respectively in a star topology. There are two switching boards 11, which are cascaded and serve as backups for each other.

[0044] Furthermore, the control board 12 includes an Ethernet-based control board interface processing module 121 and a control information processing module 122; the control board interface processing module 121 includes a control board network port driver 1211, a control board IP layer 1212, a control board broadcast port 1213, and a control board control port 1214.

[0045] Furthermore, the service board 13 includes: a service board interface processing module 131, a service processing module 132, and an external interface processing module 133; the service board interface processing module 131 also includes a service board network port driver 1211, a service board IP layer 1212, a service board broadcast port 1213, a service board control port 1314, and a service board media stream port 1315. The service board 13 connects to external systems via the external interface processing module 133, and the connected external systems include 5G networks, GSM networks, Tetra networks, and WIFI networks.

[0046] Furthermore, MMI 2 also includes a human-machine operation module 22 and a media information processing module 23, which are respectively connected to the MMI interface processing module 21; the MMI interface processing module 21 also includes an MMI network port driver 211, an MMI IP layer 212, an MMI broadcast port 213, an MMI control port 214, and an MMI media stream port 215.

[0047] Furthermore, a control channel is formed by interconnecting the control board control port 1214, the service board control port 1314, and the MMI control port 214 via the switch board 11 to transmit control signals. The control ports are connected using the UDP protocol.

[0048] Furthermore, a broadcast channel is formed by interconnecting the control board broadcast port 1213, the service board broadcast port 1313, and the MMI broadcast port 213 via the switch board 11 to transmit broadcast information. The broadcast ports are connected using the UDP protocol.

[0049] Furthermore, the service board media stream port 1315 and the MMI media stream port 215 are interconnected via the switch board 11 to form an audio and video channel for transmitting media stream information. The RTP media stream ports are connected using the UDP protocol.

[0050] Furthermore, the external interface processing module 133 connects with the external system to form an external business channel.

[0051] Figure 2This is a schematic diagram illustrating the control and processing of the main MMI audio / video stream channel switching in the vehicle-mounted communication device. External systems can be 5G networks, GSM networks, Tetra networks, Wi-Fi networks, etc., connected to the vehicle-mounted communication device through corresponding communication service boards. Internally, the communication channels between each board utilize IP packet channels based on Ethernet buses, primarily including control channels, broadcast channels, and audio / video channels. The control and processing of the main MMI audio / video stream channel switching in the vehicle-mounted communication device is implemented as follows:

[0052] (1) The control board stores the master and slave control status information of MMI1 and MMI2 (there are three status definitions: MMI1 is the master and MMI2 is the slave, MMI2 is the master and MMI1 is the slave, and both MMI1 and MMI2 are slaves). In this example, it is assumed that when the device is first powered on, the status of MMI1 and MMI2 stored in the memory of the control board is both slave. When the vehicle communication device is powered on, the master and MMI start normally. The control information processing module reads the master and slave control MMI status information from the memory for initialization and adds master and slave control MMI indication information (MMI1 and MMI2 are both slaves)① to the broadcast message. After receiving message①, both MMI1 and MMI2 enter the slave control state.

[0053] (2) The user applies to enter the master control state by pressing the button on the MMI1. The human-machine operation processing module of the MMI1 generates the master control application message ②. After passing through the interface processing module of the MMI1, the master control application message ② is sent to the control board through the control channel with the participation of the switching board.

[0054] (3) After receiving message ②, the interface processing module of the control board forwards the message to the control information processing module. The control information processing module immediately modifies the master and slave control MMI indication information (MMI1 master and MMI2 slave) ③ in the broadcast information, and with the participation of the switching board, immediately sends the message to all service boards, MMI1 and MMI2 through the broadcast channel.

[0055] (4) After receiving the main and secondary control MMI indication information (MMI1 is the main controller and MMI2 is the secondary controller) ③ in the broadcast information through the interface processing module, the human-machine operation processing module of MMI1 switches to the main control state; after receiving the main and secondary control MMI indication information (MMI1 is the main controller and MMI2 is the secondary controller) ③ in the broadcast information through the interface processing module, the human-machine operation processing module of MMI2 maintains the secondary control state.

[0056] (5) The service board’s service flow processing module, after receiving the main and secondary control MMI indication information (MMI1 is the main control and MMI2 is the secondary control) ③ in the broadcast information through the internal interface processing module, modifies the target IP address of the RTP media stream to the IP address of the main control MMI (at this time, it is the IP address of MMI1). With the participation of the switching board, an audio and video channel is established between the service board and MMI1. Subsequent audio and video data packets ④ will communicate between the main MMI (at this time, it is MMI1) and the service board through this channel.

[0057] (6) As needed, the user needs to switch the main MMI from MMI1 to MMI2. At this time, the user applies to enter the master control state through button operation on MMI2. The human-machine operation processing module of MMI2 generates a master control application message ⑤. After passing through the interface processing module of MMI2, with the participation of the switching board, the master control application message ⑤ is sent to the control board through the control channel.

[0058] (7) After receiving message ⑤, the interface processing module of the control board forwards the message to the control information processing module. The control information processing module immediately modifies the master and slave control MMI indication information (MMI2 master and MMI1 slave) ⑥ in the broadcast information, and with the participation of the switching board, sends the message to all service boards, MMI1 and MMI2 through the broadcast channel.

[0059] (8) After receiving the main and secondary control MMI indication information (MMI2 is the main controller and MMI1 is the secondary controller)⑥ in the broadcast information through the interface processing module, the human-machine operation processing module of MMI1 switches to the secondary control state; after receiving the main and secondary control MMI indication information (MMI2 is the main controller and MMI1 is the secondary controller)⑥ in the broadcast information through the interface processing module, the human-machine operation processing module of MMI2 switches to the main control state.

[0060] (9) The service board's service flow processing module, after receiving the master and slave MMI indication information (MMI2 is the master and MMI1 is the slave)⑥ from the broadcast information via the internal interface processing module, modifies the target IP address of the RTP media stream to the IP address of the master MMI (which is now the IP address of MMI2). With the participation of the switching board, it dismantles the audio and video channel between the service board and MMI1 and establishes an audio and video channel between the service board and MMI2. Subsequent audio and video data packets⑦ will communicate between the master MMI (now MMI2) and the service board through this channel. This completes the switching of the master MMI audio and video stream channel from MMI1 to MMI2.

[0061] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A subway vehicle-mounted communication device, the vehicle-mounted communication device comprising a vehicle-mounted host (1) and multiple operation display terminals (MMIs) (2); the vehicle-mounted host (1) is provided with a switching board (11), a control board (12) and a service board (13); the MMIs (2) are connected to the switching board (11), and the switching board (11) is connected to the control board (12) and the service board (13) respectively; Its features are, The service board (13) and the MMI (2) are respectively provided with an Ethernet-based internal interface processing module (131) and an MMI interface processing module (21); wherein the internal interface processing module (131) and the MMI interface processing module (21) are respectively provided with a service board media stream port (1315) and an MMI media stream port (215). The control board (12) also includes an Ethernet-based control board interface processing module (121) and a control information processing module (122). The control board interface processing module (121) includes a control board network port driver (1211), a control board IP layer (1212), a control board broadcast port (1213), and a control board control port (1214). The service board (13) also includes a service processing module (132) connected to the service board internal interface processing module (131). The internal interface processing module (131) of the service board also includes a service board network port driver (1311), a service board IP layer (1312), a service board broadcast port (1313), and a service board control port (1314). The MMI (2) also includes a human-machine operation module (22) and a media information processing module (23) that are respectively connected to the MMI interface processing module (21). The MMI interface processing module (21) also includes an MMI network port driver (211), an MMI IP layer (212), an MMI broadcast port (213), and an MMI control port (214). There are two exchange boards (11), and the two exchange boards (11) are cascaded.

2. The subway vehicle-mounted communication device according to claim 1, characterized in that, The service board (13) is equipped with an external interface processing module (133), which is connected to an external system.

3. A subway vehicle-mounted communication device according to claim 2, characterized in that, The business board (13) is equipped with multiple components that are matched with external systems.

4. A subway vehicle-mounted communication device according to claim 3, characterized in that, The external systems matched to the multiple service boards (13) include 5G networks, GSM networks, Tetra networks and WIFI networks.

5. A method for switching control of the main MMI audio / video stream channel of a subway onboard communication device, characterized in that, The control method shown is applied to the subway vehicle-mounted communication device as described in any one of claims 1-4, and the steps include: The human-machine operation processing module (22) receives the input request to enter the master control state and generates the request master control message; The MMI interface processing module (21) sends the request master control message to the control board (12) via the control channel through the switching board (11). After receiving the request for master control message, the control board interface processing module (121) forwards the message to the control information processing module (122). The control information processing module (122) modifies the main and secondary control MMI indication information in the broadcast information and sends the main and secondary control MMI indication information to all service boards (13) and MMI (2) through the broadcast channel via the switching board (11). After receiving the main and secondary control MMI indication information from the broadcast information via the MMI interface processing module (21), the human-machine operation processing module (22) switches the main and secondary control status; After receiving the main and secondary control MMI indication information in the broadcast information through the internal interface processing module (131), the service flow processing module (13) modifies the target IP address of the media stream port (1315) to the IP address of the main control MMI, and establishes an audio and video channel between the service board (13) and the main control MMI with the participation of the switching board (11).

6. The method for switching control of the main MMI audio / video stream channel of a subway vehicle-mounted communication device according to claim 5, characterized in that, The When the vehicle communication device is powered on, the vehicle host (1) and MMI (2) are started; The control information processing module (122) reads the status information of the master and slave control MMIs for initialization and adds master and slave control MMI indication information to the broadcast message; After receiving the instruction information from the primary and secondary control MMIs, MMI(2) enters the initial primary and secondary control state.

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