CN113411331B - Vehicle-mounted comprehensive monitoring CCTV system based on LTE and WIFI dual-network integration - Google Patents
Vehicle-mounted comprehensive monitoring CCTV system based on LTE and WIFI dual-network integration Download PDFInfo
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Abstract
The invention relates to a vehicle-mounted comprehensive monitoring CCTV system based on LTE and WIFI dual-network fusion, which is characterized by comprising a network function module, a signaling service function module and a streaming media service function module, wherein: the network function module has three-layer routing function and two-layer switch function; the vehicle-mounted comprehensive monitoring CCTV system realizes control interaction with a control center CCTV system through a signaling service function module; and setting the IP address and the communication protocol of each vehicle-mounted camera so that the streaming media service function module can communicate with each vehicle-mounted camera. The invention provides a vehicle-mounted comprehensive monitoring CCTV system based on the fusion of double networks of LTE and WIFI, which is used for determining the interaction of vehicle-mounted comprehensive monitoring CCTV system and the comprehensive monitoring data of a control center and completing the system function.
Description
Technical Field
The invention relates to a vehicle-mounted CCTV system based on LTE and WIFI dual-network fusion.
Background
As the urban rail transit unmanned train with the continuously accelerated development speed and the domestic subway unmanned train adopt the international highest-grade GoA4 full-automatic operation system, and the train does not need driver operation during normal operation. Under the automatic control of full-automatic operation core systems such as a signal system and a vehicle system, the train has the functions of full-automatic online operation, automatic entrance and exit, automatic opening and closing, automatic awakening, dormancy and the like, and actively diagnoses faults.
In the early operation stage of the unmanned line, in order to guarantee the operation safety of the open line, the emergency response of an emergency in the peak period is improved, the driving protection level is improved, the operator can strengthen the monitoring of the unmanned train through a dispatcher in a dispatching control center, and the vehicle-mounted CCTV system is part of the rail transit comprehensive monitoring and is an important monitoring data source for the dispatcher to monitor the real-time condition of the train and the emergency disposal.
The vehicle-mounted comprehensive monitoring realizes information interaction between the vehicle and the ground through a wireless transmission channel. The data stream is generally transmitted by a vehicle-mounted comprehensive monitoring CCTV system to ground vehicle-ground wireless equipment through a vehicle-mounted vehicle-ground wireless equipment, the ground vehicle-ground wireless equipment transmits the media stream to a control center CCTV system through a core network interaction machine of the control center, and the control center CCTV system transmits the media stream to the control center for comprehensive monitoring and displaying.
The wireless transmission technology used in the project scenario mainly includes: LTE, WLAN. In rail transit, a train-ground LTE network mainly faces service data with high reliability, high safety and small data volume, and a train-ground Wi-Fi network mainly faces service data with large data volume, high safety and low reliability. Generally, the vehicle-ground LTE allows the 720P video streams with the maximum 2 channels to be simultaneously transmitted in each group of channels, and the vehicle-ground Wi-Fi allows the 720P video streams with the maximum 8 channels to be simultaneously transmitted in each group of channels. As the unmanned driving is still in the initial operation stage at present, although the transmission channel is clear, the specific use and network planning of the two wireless transmission channels are not clear, the general vehicle-ground LTE network is used as an emergency CCTV video channel, the vehicle-ground Wi-Fi network is used as a common CCTV video channel, and the specific data stream is not clearly planned, which may cause that the vehicle-mounted CCTV system cannot meet the real requirement of operation.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: at present, the specific use and network planning of vehicle-ground Wi-Fi and vehicle-ground LTE by unmanned driving are not very clear, and the specific data flow is not clearly planned, so that the real requirement of operation cannot be met by a vehicle-mounted CCTV system.
In order to solve the technical problems, the technical scheme of the invention is to provide a vehicle-mounted comprehensive monitoring CCTV system based on the fusion of dual networks of LTE and WIFI, which is characterized by comprising a network function module, a signaling service function module and a streaming media service function module, wherein:
the network function module has three-layer routing function and two-layer switch function; data interfaces exist among the vehicle-mounted comprehensive monitoring CCTV system, the vehicle-mounted LTE system, the vehicle-mounted WIFI system and the vehicle-mounted PIS system; the vehicle-mounted LTE system and the vehicle-mounted WIFI system are used for providing a vehicle-ground data transmission function, the vehicle-mounted comprehensive monitoring CCTV system performs three-layer routing configuration with data interfaces of the vehicle-mounted LTE system and the vehicle-mounted WIFI system through a network function module, so that three layers of isolation are performed on the data interfaces between the vehicle-mounted comprehensive monitoring CCTV system and the vehicle-mounted LTE system and the data interfaces between the vehicle-mounted comprehensive monitoring CCTV system and the vehicle-mounted WIFI system, and different routing strategies are set; the vehicle-mounted PIS system is used for providing a data transmission function of the vehicle-mounted camera, the vehicle-mounted comprehensive monitoring CCTV system configures a data interface between the vehicle-mounted comprehensive monitoring CCTV system and the vehicle-mounted PIS system into a two-layer switch function through a network function module, and the vehicle-mounted comprehensive monitoring CCTV system acquires state data and streaming media data of the vehicle-mounted camera through interaction with the vehicle-mounted PIS system;
the vehicle-mounted comprehensive monitoring CCTV system realizes control interaction with the CCTV system of the control center through the signaling service function module; defining the signaling service existing in the CCTV system of the control center as a superior signaling service, and defining the streaming media service existing in the CCTV system of the control center as a superior streaming media service; in the signaling service function module, addresses and ports of signaling services are set, and during setting, different settings are performed on signaling service registration information of the vehicle-mounted LTE system and the vehicle-mounted WIFI system, so that a CCTV system of a control center can be ensured to be capable of distinguishing the signaling services of the vehicle-mounted LTE system and the vehicle-mounted WIFI system; the method comprises the steps that the device id and the name sent to an upper-level signaling service by a vehicle-mounted camera are set, and the uniqueness of device information corresponding to the vehicle-mounted camera is guaranteed; the signaling service function module performs system registration to a superior signaling service through a registration function, and the vehicle-mounted comprehensive monitoring CCTV system performs service registration twice on a CCTV system of a control center: the signaling service function module registers a signaling service from a data channel provided by the vehicle-mounted LTE system to a superior signaling service through the network function module, and the service id, the service name and the service address of the signaling service are special for the vehicle-mounted LTE system; meanwhile, the signaling service function module registers another signaling service to a superior signaling service from a data channel provided by the vehicle-mounted WIFI system through the network function module, and the service id, the service name and the service address of the signaling service are special for the vehicle-mounted WIFI system; at the moment, two registered signaling services exist in the upper level signaling service, and the upper level signaling service automatically selects different paths to access the vehicle-mounted comprehensive monitoring CCTV system through the request of the user and the registered information;
the signaling service function module also provides a real-time preview function, and is realized by adopting the following steps:
the control center comprehensively monitors and sends a real-time preview instruction to the CCTV system of the control center, wherein the real-time preview instruction comprises a service id and a device id; at the moment, the CCTV system of the control center obtains a service address of the registered signaling service by analyzing the service id, and selects an LTE channel provided by the vehicle-mounted LTE system or a WIFI channel provided by the vehicle-mounted WIFI system to send a real-time preview instruction to the signaling service of the service address through the service address; a signaling service of the vehicle-mounted comprehensive monitoring CCTV system receives a real-time preview instruction sent by a superior signaling service, analyzes the real-time preview instruction, acquires a vehicle-mounted camera corresponding to equipment id, and informs a streaming media service function module of the information; the streaming media service function module acquires streaming media of the vehicle-mounted camera corresponding to the device id, decodes and codes the streaming media, selects a corresponding data interface through the service id in the real-time preview instruction, and selects an LTE (long term evolution) channel provided by a vehicle-mounted LTE system or a WIFI (wireless fidelity) channel provided by a vehicle-mounted WIFI (wireless fidelity) system to transmit data to a superior streaming media service;
setting an IP address and a communication protocol of each vehicle-mounted camera so that the streaming media service function module can communicate with each vehicle-mounted camera; the stream media service function module receives the notice of the signaling service function module, obtains the stream media data of the vehicle-mounted camera from the vehicle-mounted PIS system through the network function module, decodes and codes the stream media data, and uploads the coded stream media data to the upper-level stream media service.
Preferably, vlan division is performed on three data interfaces of the vehicle-mounted LTE system, the vehicle-mounted WIFI system, and the vehicle-mounted PIS system.
Preferably, the signaling service function module adopts an SIP protocol as a transmission protocol, and the vehicle-mounted comprehensive monitoring CCTV system performs control interaction with the control center CCTV system through the signaling service function module by adopting the SIP protocol.
Preferably, when registering one of the signaling services with the upper level signaling service, the upper level signaling service further includes an expiration date of the signaling service.
Preferably, the signaling service function module performs system logout to the superior signaling service through a logout function, and the logged-out vehicle-mounted comprehensive monitoring CCTV system will not provide any service to the outside;
the signaling service function module provides a device resource list including device id and name of each vehicle-mounted camera to a superior signaling service through a device resource query function;
when the on-line or off-line state of the vehicle-mounted camera on the train changes, the signaling service function module actively pushes messages to the superior signaling service through the equipment state pushing function.
The signaling service function module also provides a real-time wall-mounting function, and is realized by adopting the following steps:
the upper level signaling service issues a real-time on-wall instruction, after receiving the instruction, the signaling service function module notifies the streaming media service function module, and the streaming media service function module acquires a media stream of the vehicle-mounted comprehensive monitoring CCTV system according to relevant information in the instruction sent by the signaling service function module and uploads the media stream to the upper level streaming media service;
the signaling service function module sends a heartbeat keep-alive instruction to a superior signaling service periodically through the heartbeat keep-alive function, so that the current signaling service is ensured to be online.
Preferably, the streaming media service function module adopts an RTP protocol as a transport protocol.
Preferably, the streaming media service function module supports an h.265 coding format and a ps coding format, where the h.265 coding format is used for a real-time preview function provided by the signaling service function module, and the ps coding format is used for a real-time wall-loading function provided by the signaling service function module.
Preferably, one set of vehicle-mounted comprehensive monitoring CCTV system is deployed on each of the head and tail of the train, and the two sets of vehicle-mounted comprehensive monitoring CCTV systems are not influenced with each other, so that a hot standby double-active system operation mode is formed; each vehicle-mounted comprehensive monitoring CCTV system can perform service registration twice on the superior signaling service.
The invention provides a vehicle-mounted comprehensive monitoring CCTV system based on the fusion of double networks of LTE and WIFI, which is used for determining the interaction of vehicle-mounted comprehensive monitoring CCTV system and the comprehensive monitoring data of a control center and completing the system function.
Drawings
FIG. 1 is a system diagram of the present invention;
FIG. 2 is a data flow diagram of the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Fig. 1 shows a complete vehicle-mounted CCTV system, in which the functional modules include a network functional module, a signaling service functional module, and a streaming media service functional module, and the related data streams are shown in fig. 2.
The network function module has three-layer routing function and two-layer switch function. In order to complete the functions of vehicle-ground data transmission, obtaining the data of cameras in a vehicle and the like, on a train, an interface exists between a vehicle-mounted comprehensive monitoring CCTV system and three vehicle-mounted subsystems, wherein the three subsystems are respectively as follows: the system comprises a vehicle-mounted LTE system, a vehicle-mounted WIFI system and a vehicle-mounted PIS system. And carrying out vlan division on three data interfaces of the vehicle-mounted LTE system, the vehicle-mounted WIFI system and the vehicle-mounted PIS system.
The vehicle-mounted LTE system and the vehicle-mounted WIFI system provide a vehicle-ground data transmission function, and three layers of routing configuration are carried out between the vehicle-mounted comprehensive monitoring CCTV system and data interfaces of the vehicle-mounted LTE system and the vehicle-mounted WIFI system. And carrying out three-layer isolation on a data interface between the vehicle-mounted comprehensive monitoring CCTV system and the vehicle-mounted LTE system and a data interface between the vehicle-mounted comprehensive monitoring CCTV system and the vehicle-mounted WIFI system through a three-layer routing function, and setting different routing strategies.
The vehicle-mounted PIS system provides a data transmission function of the vehicle-mounted camera, and a data interface between the vehicle-mounted comprehensive monitoring CCTV system and the vehicle-mounted PIS system is configured to have a two-layer switch function. Through the function of the two-layer switch, the vehicle-mounted comprehensive monitoring CCTV system and the vehicle-mounted PIS system interact to acquire the state data and the streaming media data of the camera.
The signaling service function module adopts SIP protocol as transmission protocol, and the signaling service function module and the CCTV system of the control center adopt SIP protocol for control interaction. There is also a signaling service in the control center CCTV system, which is called an upper level signaling service. In the signaling service function module, the address and port of the signaling service are set. During setting, different settings are carried out on the signaling service registration information of the vehicle-mounted LTE system and the vehicle-mounted WIFI system, and the signaling service of the vehicle-mounted LTE system and the signaling service of the vehicle-mounted WIFI system can be ensured to be distinguished; and the equipment id and the name sent to the upper-level signaling service by the vehicle-mounted camera are set, so that the uniqueness of the equipment information corresponding to the vehicle-mounted camera is ensured.
The signaling service function module is mainly used for providing the functions of registration, logout, equipment resource query, equipment state pushing, real-time preview, real-time wall-mounting, heartbeat keep-alive and the like of the vehicle-mounted CCTV system, wherein:
the signaling service function module carries out system registration to the superior signaling service through a registration function, and the main registered content comprises a service id, a service name, a service address and an effective period of a registration service party. The vehicle-mounted comprehensive monitoring CCTV system can be discovered and used by a user only after the signaling service of the vehicle-mounted comprehensive monitoring CCTV system successfully registers to a superior service.
The vehicle-mounted comprehensive monitoring CCTV system is isolated from data interfaces of the vehicle-mounted LTE system and the vehicle-mounted WIFI system through the network function module. The signaling service function module registers a signaling service from a data channel provided by the vehicle-mounted LTE system to a superior signaling service through the network function module, and the service id, the service name and the service address of the signaling service are special for the vehicle-mounted LTE system. And the signaling service function module registers another signaling service to the superior signaling service from a data channel provided by the vehicle-mounted WIFI system through the network function module, and the service id, the service name and the service address of the signaling service are special for the vehicle-mounted WIFI system. At this time, two registered signaling services exist in the upper level signaling service, and the upper level signaling service can automatically select different paths to access the vehicle-mounted comprehensive monitoring CCTV system through the request of the user and the registered information.
The signaling service function module carries out system logout to the superior signaling service through the logout function, and the logout vehicle-mounted comprehensive monitoring CCTV system does not provide any service to the outside.
The signaling service function module provides a device resource list including device id, name and the like of each vehicle-mounted camera to a superior signaling service through a device resource query function.
When the on-line or off-line state of the vehicle-mounted camera on the train changes, the signaling service function module actively pushes messages to the superior signaling service through the equipment state pushing function.
The real-time preview function of the signaling service function module is realized by adopting the following modes:
the upper level signaling service issues a real-time preview instruction, the signaling service function module notifies the streaming media service function module after receiving the instruction, and the streaming media service function module acquires a media stream of the vehicle-mounted comprehensive monitoring CCTV system according to relevant information in the instruction sent by the signaling service function module and uploads the media stream to the upper level streaming media service.
The control center comprehensively monitors and sends a real-time preview instruction to the CCTV system of the control center, wherein the real-time preview instruction already comprises a service id and a device id. At the moment, the CCTV system of the control center obtains a service address of the registration service by analyzing the service id, and selects an LTE channel provided by the vehicle-mounted LTE system or a WIFI channel provided by the vehicle-mounted WIFI system to send a real-time preview instruction to the signaling service of the service address through the service address. The signaling service of the vehicle-mounted comprehensive monitoring CCTV system receives a real-time preview instruction sent by a superior signaling service, analyzes the real-time preview instruction, acquires a vehicle-mounted camera corresponding to the equipment id, and informs the information to a streaming media service function module. And the streaming media service function module acquires streaming media of the vehicle-mounted camera corresponding to the device id, decodes and codes the streaming media, selects a corresponding data interface through the service id in the real-time preview instruction, and selects an LTE (long term evolution) channel provided by the vehicle-mounted LTE system or a WIFI (wireless fidelity) channel provided by the vehicle-mounted WIFI system to transmit data to a superior streaming media service.
The real-time wall-mounting function of the signaling service function module is realized by adopting the following modes:
the upper level signaling service issues a real-time on-wall instruction, the signaling service functional module informs the streaming media service functional module after receiving the instruction, and the streaming media service functional module acquires a media stream of the vehicle-mounted comprehensive monitoring CCTV system according to related information in the instruction sent by the signaling service functional module and uploads the media stream to the upper level streaming media service.
The signaling service function module periodically sends heartbeat keep-alive instructions to the superior signaling service through the heartbeat keep-alive function, so as to ensure that the current signaling service is online.
And setting the IP address and the communication protocol of each vehicle-mounted camera so that the streaming media service function module can communicate with each vehicle-mounted camera. The stream media service function module adopts RTP protocol as transmission protocol, and the stream media service and the CCTV system of the control center adopt RTP protocol for stream media transmission. There is also a streaming service in the control center CCTV system, which is called an upper level streaming service.
The stream media service function module receives the notice of the signaling service function module, obtains the stream media data of the vehicle-mounted camera from the vehicle-mounted PIS system through the network function module, decodes and codes the stream media data, and uploads the coded stream media data to the upper-level stream media service. The streaming media service function module supports two streaming media coding formats, one is H.265 coding format, and the other is ps coding format. The H.265 coding format is used for the real-time preview function provided by the signaling service function module, and the ps coding format is used for the real-time wall-climbing function provided by the signaling service function module.
Because the vehicle-mounted internal part of the train is divided into a head system and a tail system for vehicle-mounted comprehensive monitoring, in the invention, the vehicle-mounted comprehensive monitoring CCTV system is arranged in one set on each of the head and tail of the train, and the two sets of vehicle-mounted comprehensive monitoring CCTV systems are not influenced with each other, thus forming a hot standby double-active system operation mode. Each vehicle-mounted comprehensive monitoring CCTV system can perform service registration twice on the superior signaling service.
The control center comprehensive monitoring is a data requester, but the vehicle-mounted comprehensive monitoring CCTV system and the control center comprehensive monitoring are not directly interacted, but are transitively interacted through the control center CCTV system. The vehicle-mounted CCTV system performs two service registrations on the CCTV system of the control center, so that a requester for the comprehensive monitoring of the control center can request different services. Different vehicle-ground data transmission channels are determined by requesting different services, and the function of dual-network integration of the vehicle-mounted comprehensive monitoring CCTV system is completed.
The key point of the invention is that different service information is registered for the superior signaling service for different channels, the function of definitely selecting different channels corresponding to different registered services is provided for the user, the data flow direction is clarified, and when the user requests a certain type of service, different registered services are selected according to the actual requirements for the channels.
Claims (8)
1. The utility model provides a vehicle-mounted comprehensive monitoring CCTV system based on LTE and WIFI dual network fuse which characterized in that, includes network function module, signaling service function module and streaming media service function module, wherein:
the network function module has three-layer routing function and two-layer switch function; data interfaces exist among the vehicle-mounted comprehensive monitoring CCTV system, the vehicle-mounted LTE system, the vehicle-mounted WIFI system and the vehicle-mounted PIS system; the vehicle-mounted LTE system and the vehicle-mounted WIFI system are used for providing a vehicle-ground data transmission function, the vehicle-mounted comprehensive monitoring CCTV system performs three-layer routing configuration with data interfaces of the vehicle-mounted LTE system and the vehicle-mounted WIFI system through a network function module, so that the data interfaces between the vehicle-mounted comprehensive monitoring CCTV system and the vehicle-mounted LTE system and the data interfaces between the vehicle-mounted comprehensive monitoring CCTV system and the vehicle-mounted WIFI system are isolated in three layers, and different routing strategies are set; the vehicle-mounted PIS system is used for providing a data transmission function of the vehicle-mounted camera, the vehicle-mounted comprehensive monitoring CCTV system configures a data interface between the vehicle-mounted comprehensive monitoring CCTV system and the vehicle-mounted PIS system into a two-layer switch function through a network function module, and the vehicle-mounted comprehensive monitoring CCTV system acquires state data and streaming media data of the vehicle-mounted camera through interaction with the vehicle-mounted PIS system;
the vehicle-mounted comprehensive monitoring CCTV system realizes control interaction with a control center CCTV system through a signaling service function module; defining the signaling service existing in the CCTV system of the control center as a superior signaling service, and defining the streaming media service existing in the CCTV system of the control center as a superior streaming media service; in the signaling service function module, addresses and ports of signaling services are set, and during setting, different settings are performed on signaling service registration information of the vehicle-mounted LTE system and the vehicle-mounted WIFI system, so that a CCTV system of a control center can be ensured to be capable of distinguishing the signaling services of the vehicle-mounted LTE system and the vehicle-mounted WIFI system; the method comprises the steps that the device id and the name sent to an upper-level signaling service by a vehicle-mounted camera are set, and the uniqueness of device information corresponding to the vehicle-mounted camera is guaranteed; the signaling service function module performs system registration to a superior signaling service through a registration function, and the vehicle-mounted comprehensive monitoring CCTV system performs service registration twice on a CCTV system of a control center: the signaling service function module registers a signaling service from a data channel provided by the vehicle-mounted LTE system to a superior signaling service through the network function module, and the service id, the service name and the service address of the signaling service are special for the vehicle-mounted LTE system; meanwhile, the signaling service function module registers another signaling service to a superior signaling service from a data channel provided by the vehicle-mounted WIFI system through the network function module, and the service id, the service name and the service address of the signaling service are special for the vehicle-mounted WIFI system; at the moment, two registered signaling services exist in the upper level signaling service, and the upper level signaling service automatically selects different paths to access the vehicle-mounted comprehensive monitoring CCTV system through the request of the user and the registered information;
the signaling service function module also provides a real-time preview function, and is realized by adopting the following steps:
the control center comprehensively monitors and sends a real-time preview instruction to the CCTV system of the control center, wherein the real-time preview instruction already comprises a service id and a device id; at the moment, the CCTV system of the control center obtains a service address of the registered signaling service by analyzing the service id, and selects an LTE channel provided by the vehicle-mounted LTE system or a WIFI channel provided by the vehicle-mounted WIFI system to send a real-time preview instruction to the signaling service of the service address through the service address; a signaling service of the vehicle-mounted comprehensive monitoring CCTV system receives a real-time preview instruction sent by a superior signaling service, analyzes the real-time preview instruction, acquires a vehicle-mounted camera corresponding to equipment id, and informs a streaming media service function module of the information; the streaming media service function module acquires streaming media of the vehicle-mounted camera corresponding to the device id, decodes and codes the streaming media, selects a corresponding data interface through the service id in the real-time preview instruction, and selects an LTE (long term evolution) channel provided by a vehicle-mounted LTE system or a WIFI (wireless fidelity) channel provided by a vehicle-mounted WIFI (wireless fidelity) system to transmit data to a superior streaming media service;
setting an IP address and a communication protocol of each vehicle-mounted camera so that the streaming media service function module can communicate with each vehicle-mounted camera; the stream media service function module receives the notice of the signaling service function module, obtains the stream media data of the vehicle-mounted camera from the vehicle-mounted PIS system through the network function module, decodes and codes the stream media data, and uploads the coded stream media data to the upper-level stream media service.
2. The CCTV system based on LTE and WIFI dual-network fusion for vehicle-mounted comprehensive monitoring of claim 1, wherein three data interfaces of the vehicle-mounted LTE system, the vehicle-mounted WIFI system and the vehicle-mounted PIS system are divided into vlans.
3. The CCTV system for vehicle-mounted comprehensive monitoring based on LTE and WIFI dual-network convergence of claim 1, wherein the signaling service function module adopts SIP protocol as a transmission protocol, and the CCTV system for vehicle-mounted comprehensive monitoring performs control interaction with the CCTV system of the control center through the signaling service function module by adopting SIP protocol.
4. The CCTV system for vehicle-mounted comprehensive monitoring based on LTE and WIFI dual-network convergence according to claim 1, wherein when registering one signaling service to the upper level signaling service, the CCTV system further comprises the validity period of the signaling service.
5. The CCTV system based on LTE and WIFI dual-network integration for vehicle-mounted comprehensive monitoring of claim 1, wherein the signaling service function module performs system logout to the superior signaling service through a logout function, and the logout CCTV system for vehicle-mounted comprehensive monitoring does not provide any service to the outside;
the signaling service function module provides a device resource list including device id and name of each vehicle-mounted camera to a superior signaling service through a device resource query function;
when the on-line or off-line state of a vehicle-mounted camera on the train changes, the signaling service function module actively pushes messages to the superior signaling service through the equipment state pushing function;
the signaling service function module also provides a real-time wall-mounting function, and is realized by adopting the following steps:
the upper level signaling service issues a real-time on-wall instruction, after receiving the instruction, the signaling service function module notifies the streaming media service function module, and the streaming media service function module acquires a media stream of the vehicle-mounted comprehensive monitoring CCTV system according to relevant information in the instruction sent by the signaling service function module and uploads the media stream to the upper level streaming media service;
the signaling service function module periodically sends heartbeat keep-alive instructions to the superior signaling service through the heartbeat keep-alive function, and the current signaling service is ensured to be online.
6. The CCTV system for vehicle-mounted comprehensive monitoring based on LTE and WIFI dual-network convergence of claim 1, wherein the streaming media service function module adopts RTP protocol as transmission protocol.
7. The CCTV system for vehicle-mounted comprehensive monitoring based on LTE and WIFI dual-network convergence of claim 5, wherein the streaming media service function module supports an H.265 coding format and a ps coding format, wherein the H.265 coding format is used for a real-time preview function provided by the signaling service function module, and the ps coding format is used for a real-time wall-climbing function provided by the signaling service function module.
8. The vehicle-mounted comprehensive monitoring CCTV system based on the integration of the LTE network and the WIFI network, as claimed in claim 1, wherein one set of the vehicle-mounted comprehensive monitoring CCTV system is deployed on each of the head and tail of the train, and the two sets of the vehicle-mounted comprehensive monitoring CCTV systems are not affected with each other, thereby forming a hot standby and active system operation mode; each vehicle-mounted comprehensive monitoring CCTV system can perform service registration twice on the superior signaling service.
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