CN108684013B - Communication system and communication method for subway emergency rescue - Google Patents
Communication system and communication method for subway emergency rescue Download PDFInfo
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- CN108684013B CN108684013B CN201810274462.0A CN201810274462A CN108684013B CN 108684013 B CN108684013 B CN 108684013B CN 201810274462 A CN201810274462 A CN 201810274462A CN 108684013 B CN108684013 B CN 108684013B
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- 238000004891 communication Methods 0.000 title claims abstract description 220
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000008054 signal transmission Effects 0.000 claims description 27
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
- H04L12/462—LAN interconnection over a bridge based backbone
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
Abstract
The invention discloses a communication system and a communication method for subway emergency rescue, wherein the communication system comprises: PC equipment, a communication server, an internal gateway and each mobile terminal; the PC equipment is in network connection communication with the communication server; the communication server is in network connection communication with the internal gateway; the interior gateway wirelessly communicates with each mobile terminal. The communication method comprises the following steps: and detecting the 4G network signal intensity of the accident site, if the 4G unit of the mobile terminal can acquire the 4G network signal, directly transmitting video data by using the 4G network, and if the 4G unit of the mobile terminal cannot acquire the 4G network signal, transmitting the video data by combining the wireless network bridge and the 4G network. The communication system and the communication method transmit the 4G signals in a multi-level bridging mode of the wireless network bridge, can efficiently transmit the video signals under the condition that the accident site is not covered by the 4G signals, and are convenient for remote video monitoring of a dispatching center and guiding accident rescue.
Description
Technical Field
The invention relates to a communication system and a method, in particular to a communication system and a method for subway emergency rescue.
Background
The method comprises the steps of carrying out demand analysis on emergency equipment according to emergency procedures and requirements of a subway, firstly ensuring emergency efficiency, requiring emergency personnel to quickly reach an appointed accident site, requiring the emergency equipment to be portable firstly and miniaturized because of numerous accident types and limited number of people reachable in a plurality of accident sites, and additionally requiring the quality of the equipment to be guaranteed, wherein all the equipment used at this time is required to have higher anti-collision, dustproof and waterproof capabilities, and ensuring that the equipment cannot be damaged and failed in an emergency process. The most important is that the equipment has high adaptation capability to the subway emergency environment and is suitable for all complex subway environments, and multiple sets of equipment can be erected by utilizing technologies such as multistage cascade and the like during signal transmission according to scene requirements of curves, sheltering, cross-layer, long distance and the like in the subway, so that flexible and convenient crossing is realized, obstacles and sheltered areas of large area are avoided, signal transmission and coverage under complex terrains are realized, and the signal transmission requirement under each scene is met. The equipment is convenient to build, and can ensure that the information of emergency personnel and dispatching center personnel is stable and communicated for a long time.
At present, a mode of combining wireless and wired modes is used for subway emergency, network signals are transmitted in a wired mode before arriving at an accident site, the main reason is that in order to overcome complex terrains in subway stations, wired parts generally use field operation optical fibers, the transmission distance is limited, carrying is relatively inconvenient, and the network construction time during emergency is too long to a certain extent. The 3G signals are used by network transmission and coverage equipment used in an accident site, the bandwidth greatly limits the information intercommunication capability, at present, only the audio signal intercommunication can be realized, the video signal intercommunication cannot be carried out, and the information interaction capability between an emergency center and the site is greatly limited.
Disclosure of Invention
The purpose of the invention is as follows: the equipment and the system for video communication and signal transmission in the subway emergency are provided, and the transmission and coverage of network signals and the video communication function can be realized.
The technical scheme is as follows: the communication system for subway emergency rescue comprises PC equipment, a communication server, an internal gateway and each mobile terminal; the PC equipment is in network connection communication with the communication server; the communication server is in network connection communication with the internal gateway; the interior gateway wirelessly communicates with each mobile terminal.
Further, a wireless bridge is also included; the interior gateway wirelessly communicates with each mobile terminal through a wireless bridge.
Further, the wireless bridge comprises a bridge 4G communication module, a WIFI communication module and at least one wireless relay communication module; the internal gateway is connected with a main 4G communication module; the main 4G communication module and the bridge 4G communication module communicate through a 4G network; the wireless relay communication module forms a wireless relay link between the network bridge 4G communication module and the WIFI communication module; the network bridge 4G communication module is in wireless communication with the WIFI communication module through a wireless relay link; the mobile terminal is provided with a WIFI unit; and the WIFI communication module is in wireless communication with the WIFI units of the mobile terminals.
Furthermore, the mobile terminal is also provided with a 4G unit, and the main 4G communication module is communicated with the 4G unit of each mobile terminal through a 4G network.
Further, the communication server comprises a video streaming media storage server and a video streaming media forwarding server; the video streaming media storage server is communicated with the video streaming media forwarding server, and the video streaming media storage server stores and backups communication data forwarded by the video streaming media forwarding server in real time; the video streaming media server is respectively connected and communicated with the PC equipment and the internal gateway network and is used for compressing and forwarding communication data.
Furthermore, the hardware structures of the network bridge 4G communication module, the wireless relay communication module and the WIFI communication module are the same, and each network bridge 4G communication module, the wireless relay communication module and the WIFI communication module is composed of a signal transmission central control unit, a self-adaptive switching unit, two 5.8GHz built-in directional antennas, a WIFI covering unit, a 4G router unit and an external interface for externally connecting a 4G signal receiving antenna; the signal receiving end is respectively connected with the 4G router unit and one 5.8GHz built-in directional antenna through the self-adaptive switching unit by the signal transmission central control unit, and the signal sending end is respectively connected with the WIFI covering unit and the other 5.8GHz built-in directional antenna through the self-adaptive switching unit by the signal transmission central control unit; the signal receiving end self-adaptive switching unit is used for switching the receiving end to select a 4G router unit or a 5.8GHz built-in directional antenna for signal receiving according to the signal format, and the signal sending end self-adaptive switching unit is used for switching the receiving end to select a WIFI coverage unit or a 5.8GHz built-in directional antenna for signal sending according to the signal format.
Further, the adaptive switching unit is used for controlling each hardware structure in the wireless bridge to be configured into a bridge 4G communication module, a wireless relay communication module and a WIFI communication module; the network bridge 4G communication module, the wireless relay communication module and the WIFI communication module in the wireless network bridge respectively correspond to three working modes, namely a network bridge 4G communication mode, a wireless relay communication mode and a WIFI communication mode, when the equipment is in the network bridge 4G communication mode, the hardware structure is configured to be a 4G router unit and a built-in 5.8GHZ built-in directional antenna, and the 4G router unit is responsible for receiving 4G signals, converting the 4G signals into 5.8GHZ signals and sending the 5.8GHZ signals through the directional antenna; when the device is in a WIFI communication mode, the hardware structure is configured to be a WIFI coverage unit and a built-in 5.8GHZ built-in directional antenna, the built-in 5.8GHZ built-in directional antenna is responsible for receiving a 5.8GHZ signal sent by a link in front of the system, and the WIFI coverage unit is responsible for covering the 5.8GHZ signal through the omnidirectional antenna; when the device is in a wireless relay communication mode, the hardware structure will be configured as two 5.8GHZ built-in directional antennas for receiving and forwarding 5.8GHZ signals, respectively.
Furthermore, the three working modes can be manually selected in a setting page of the equipment, and the mode of the equipment cannot be changed after the manual selection, and can also be adjusted to be an automatic selection mode; when the equipment is inserted into the 4G card in the automatic mode, the equipment is identified to automatically enter a 4G communication working mode of the network bridge; when the equipment is connected with the omnidirectional antenna, the accessed antenna is automatically identified, and the WIFI communication mode is automatically entered; when the device is accessed without the 4G card and the omnidirectional antenna, the device enters a wireless relay communication mode.
The invention also provides a communication method of the communication system for subway emergency rescue, which comprises the following steps:
detecting the 4G network signal intensity of an accident scene, if a 4G unit of the mobile terminal can acquire a 4G network signal, directly transmitting video data by using the 4G network, and if the 4G unit of the mobile terminal cannot acquire the 4G network signal, transmitting the video data by combining a wireless network bridge and the 4G network;
the specific transmission method for transmitting the video data by using the 4G network comprises the following steps:
on one hand, the mobile terminal performs 4G network transmission on the collected video data through a 4G unit and a main 4G communication module of the internal gateway, transmits the video data to the video streaming media forwarding server through the internal gateway network, compresses the video data sent by the internal gateway by using the video streaming media forwarding server, and forwards the video data to the PC equipment;
on the other hand, the PC equipment sends the video data to a video streaming media forwarding server for compression processing, then forwards the video data to the internal gateway, and then carries out 4G network transmission by a main 4G communication module of the internal gateway and a 4G unit of the mobile terminal so as to transmit the video data to the mobile terminal;
in the process of transmitting video data by using a 4G network, a video streaming media storage server stores communication data compressed and forwarded by a backup video streaming media forwarding server in real time;
the specific transmission method for transmitting the video data by combining the wireless network bridge with the 4G network comprises the following steps:
on one hand, the mobile terminal transmits the acquired video data to the wireless network bridge through wireless communication between the WIFI unit and the WIFI communication module, then the WIFI communication module, the wireless relay communication module and the network bridge 4G communication module in the wireless network bridge transmit the video data to the 4G signal coverage area in a multi-stage bridging mode, then the network bridge 4G communication module transmits the video data to the main 4G communication module of the internal gateway through the 4G network, the internal gateway transmits the video data to the video streaming media forwarding server, and then the video streaming media forwarding server compresses the video data sent by the internal gateway and forwards the compressed video data to the PC equipment;
on the other hand, the PC equipment sends the video data to a video streaming media forwarding server for compression processing, then forwards the video data to an internal gateway, a main 4G communication module of the internal gateway and a bridge 4G communication module of a wireless bridge perform 4G network transmission, then the video data are transmitted in a multi-stage bridging mode through a WIFI communication module, a wireless relay communication module and the bridge 4G communication module in the wireless bridge, and the WIFI communication module wirelessly communicates with a WIFI unit of the mobile terminal to send the video data to the mobile terminal;
in the process of transmitting video data by combining the wireless network bridge with the 4G network, the video streaming media storage server stores the communication data compressed and forwarded by the backup video streaming media forwarding server in real time.
Compared with the prior art, the invention has the beneficial effects that: 4G signals are transmitted by means of multi-stage bridging of the wireless network bridge, so that high-efficiency transmission of video signals can be performed under the condition that no 4G signal is covered on an accident site, and remote video monitoring and accident rescue guidance of a dispatching center are facilitated; the network bridge 4G communication module, the wireless relay communication module and the WIFI communication module are set to be of the same hardware structure, so that the expandability and the universality of the wireless network bridge can be enhanced, and the maintenance is convenient.
Drawings
Fig. 1 is a schematic diagram of a subway emergency communication system of the present invention;
FIG. 2 is a schematic diagram of a subway emergency communication process according to the present invention;
FIG. 3 is a schematic diagram of a wireless bridge device of the present invention;
FIG. 4 is a schematic diagram of a wireless 4G signal reception mode according to the present invention;
FIG. 5 is a schematic diagram of a wireless signal relay mode according to the present invention;
fig. 6 is a schematic diagram of a WIFI signal coverage mode according to the present invention.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Example 1:
as shown in fig. 1, the communication system for subway emergency rescue disclosed by the invention comprises a PC device, a communication server, an internal gateway and each mobile terminal; the PC equipment is in network connection communication with the communication server; the communication server is in network connection communication with the internal gateway; the interior gateway wirelessly communicates with each mobile terminal.
Wherein, also include the wireless network bridge; the interior gateway wirelessly communicates with each mobile terminal through a wireless bridge. The wireless bridge comprises a bridge 4G communication module, a WIFI communication module and at least one wireless relay communication module; the internal gateway is connected with a main 4G communication module; the main 4G communication module and the bridge 4G communication module communicate through a 4G network; the wireless relay communication module forms a wireless relay link between the network bridge 4G communication module and the WIFI communication module; the network bridge 4G communication module is in wireless communication with the WIFI communication module through a wireless relay link; the mobile terminal is provided with a WIFI unit; and the WIFI communication module is in wireless communication with the WIFI units of the mobile terminals. The mobile terminal is also provided with a 4G unit, and the main 4G communication module is communicated with the 4G unit of each mobile terminal through a 4G network. The communication server comprises a video streaming media storage server and a video streaming media forwarding server; the video streaming media storage server is communicated with the video streaming media forwarding server, and the video streaming media storage server stores and backups communication data forwarded by the video streaming media forwarding server in real time; the video streaming media server is respectively connected and communicated with the PC equipment and the internal gateway network and is used for compressing and forwarding communication data.
The hardware structures of a network bridge 4G communication module, a wireless relay communication module and a WIFI communication module in the wireless network bridge are the same, and each network bridge is composed of a signal transmission central control unit, a self-adaptive switching unit, two 5.8GHz built-in directional antennas, a WIFI covering unit, a 4G router unit and an external interface for externally connecting a 4G signal receiving antenna; the signal receiving end is respectively connected with the 4G router unit and one 5.8GHz built-in directional antenna through the self-adaptive switching unit by the signal transmission central control unit, and the signal sending end is respectively connected with the WIFI covering unit and the other 5.8GHz built-in directional antenna through the self-adaptive switching unit by the signal transmission central control unit; the signal receiving end self-adaptive switching unit is used for switching the receiving end to select a 4G router unit or a 5.8GHz built-in directional antenna for signal receiving according to the signal format, and the signal sending end self-adaptive switching unit is used for switching the receiving end to select a WIFI coverage unit or a 5.8GHz built-in directional antenna for signal sending according to the signal format. The wireless network bridge with the same hardware structure can enhance the expandability and the universality of the wireless network bridge and is convenient to maintain.
The self-adaptive switching unit is a software module, each bridge 4G communication module, each wireless relay communication module and each WIFI communication module have own IP addresses when working, the IP addresses can be used for logging in a setting page of each module, the bridge 4G communication module, each wireless relay communication module and each WIFI communication module in each wireless bridge correspond to three working modes, different working modes are used for controlling hardware to enter different working modes, the three working modes correspond to the bridge 4G communication mode, the wireless relay communication mode and the WIFI communication mode, and the three different working modes form a working link of each wireless bridge. When the device is in a bridge 4G communication mode, the device activates a 4G router unit and a built-in 5.8GHZ directional antenna, and the 4G router unit is responsible for receiving 4G signals, converting the 4G signals into 5.8GHZ signals and sending the 5.8GHZ signals through the directional antenna. When the device is in a WIFI communication mode, the device activates a WIFI coverage unit and a built-in 5.8GHZ directional antenna, the built-in directional antenna is responsible for receiving a 5.8GHZ signal sent by a link in front of the system, and the WIFI coverage unit is responsible for covering the 5.8GHZ signal through an omnidirectional antenna.
The three working modes can be manually selected in a setting page of the equipment, and the mode of the equipment cannot be changed after the manual selection, and can also be adjusted to be an automatic selection mode. When the device is inserted into the 4G card in the automatic mode, the WDS access point mode can be automatically entered, namely the 4G communication working mode of the bridge; when the equipment is connected with the omnidirectional antenna, the equipment can automatically identify the accessed antenna and can automatically enter a WDS client mode; when the device is not accessed by the 4G card and the omnidirectional antenna, the device enters a WDS repeater mode, namely a wireless repeater communication mode. Therefore, the three devices in different working modes form the working link of the wireless bridge to realize the receiving, transmitting and covering of signals.
As shown in fig. 2, in the wireless 4G receiving mode, the signal receiving end is used by the signal transmission central control unit to select the 4G router unit through the adaptive switching unit for signal receiving, and the signal sending end is used by the signal transmission central control unit to select the 5.8GHz internal directional antenna through the adaptive switching unit for signal sending; in the wireless signal relay mode, a signal transmission central control unit selects a 5.8GHz built-in directional antenna for signal reception through a self-adaptive switching unit at a receiving end, and the signal transmission central control unit selects the 5.8GHz built-in directional antenna for signal transmission through the self-adaptive switching unit at a signal transmitting end; in the wireless WIFI coverage mode, the signal transmission central control unit selects the 5.8GHz built-in directional antenna for signal reception through the self-adaptive switching unit at the receiving end, and the signal transmission central control unit selects the WIFI coverage unit for signal transmission through the self-adaptive switching unit at the signal transmitting end.
The invention also provides a communication method of the communication system for subway emergency rescue, which comprises the following steps:
detecting the 4G network signal intensity of an accident scene, if a 4G unit of the mobile terminal can acquire a 4G network signal, directly transmitting video data by using the 4G network, and if the 4G unit of the mobile terminal cannot acquire the 4G network signal, transmitting the video data by combining a wireless network bridge and the 4G network;
the specific transmission method for transmitting the video data by using the 4G network comprises the following steps:
on one hand, the mobile terminal performs 4G network transmission on the collected video data through a 4G unit and a main 4G communication module of the internal gateway, transmits the video data to the video streaming media forwarding server through the internal gateway network, compresses the video data sent by the internal gateway by using the video streaming media forwarding server, and forwards the video data to the PC equipment;
on the other hand, the PC equipment sends the video data to a video streaming media forwarding server for compression processing, then forwards the video data to the internal gateway, and then carries out 4G network transmission by a main 4G communication module of the internal gateway and a 4G unit of the mobile terminal so as to transmit the video data to the mobile terminal;
in the process of transmitting video data by using a 4G network, a video streaming media storage server stores communication data compressed and forwarded by a backup video streaming media forwarding server in real time;
the specific transmission method for transmitting the video data by combining the wireless network bridge with the 4G network comprises the following steps:
on one hand, the mobile terminal transmits the acquired video data to the wireless network bridge through wireless communication between the WIFI unit and the WIFI communication module, then the WIFI communication module, the wireless relay communication module and the network bridge 4G communication module in the wireless network bridge transmit the video data to the 4G signal coverage area in a multi-stage bridging mode, then the network bridge 4G communication module transmits the video data to the main 4G communication module of the internal gateway through the 4G network, the internal gateway transmits the video data to the video streaming media forwarding server, and then the video streaming media forwarding server compresses the video data sent by the internal gateway and forwards the compressed video data to the PC equipment;
on the other hand, the PC equipment sends the video data to a video streaming media forwarding server for compression processing, then forwards the video data to an internal gateway, a main 4G communication module of the internal gateway and a bridge 4G communication module of a wireless bridge perform 4G network transmission, then the video data are transmitted in a multi-stage bridging mode through a WIFI communication module, a wireless relay communication module and the bridge 4G communication module in the wireless bridge, and the WIFI communication module wirelessly communicates with a WIFI unit of the mobile terminal to send the video data to the mobile terminal;
in the process of transmitting video data by combining the wireless network bridge with the 4G network, the video streaming media storage server stores the communication data compressed and forwarded by the backup video streaming media forwarding server in real time.
As shown in fig. 3, the wireless bridge of the present invention mainly functions to perform certain processing on 4G signals, perform multi-level cascading between multiple devices to perform signal transmission in a complex remote scene in a multi-level bridging manner, and perform signal coverage at a specific location through the WIFI coverage function of the device. The hardware structure of the wireless network bridge comprises a signal transmission central control unit, a self-adaptive switching unit, two 5.8GHz built-in directional antennas, a WIFI covering unit, a 4G router unit and an external interface for externally connecting a 4G signal receiving antenna. The self-adaptation switching unit in the structure can switch wireless network bridge from 5.8GHz directional antenna and 4G router unit of receiving terminal mutually, switches from between 5.8GHz directional antenna and the WIFI of sending end covering unit, through different switching forms, equipment can realize different functions according to self needs, and main use function has three kinds, and first is wireless 4G signal reception mode, and the second is wireless signal relay mode, and the third is wireless WIFI covering mode.
As shown in fig. 4, a schematic diagram of a wireless 4G signal receiver mode is shown, where a 4G router unit is responsible for receiving a 4G signal, and performs corresponding processing through a communication processor in the 4G router unit, where the corresponding processing includes IP address allocation functions such as DHCP, and the IP address allocation is performed for all networking devices in emergency communication, and a 4G traffic card is inserted into a wireless module, so as to generate the 4G signal; the external 4G signal antenna receives the 4G signal, a signal transmission central control unit in the equipment can change the IP address of the equipment and the frequency of a transmitting signal, the transmitting frequency can be changed between 5150 plus 5850MHz, the frequency can be adjusted according to different field conditions, and after the IP address of the rear-end equipment logs in a setting page of the central control unit, the use condition of the 4G flow, the signal quality and other information received by each module can be checked; the built-in 5.8GHz directional antenna can transmit 4G signals in the form of 5.8GHz signals.
As shown in fig. 5, the wireless signal relay mode is schematically illustrated, the device is located in the middle of the wireless network bridge for signal transmission and is mainly responsible for bridging and transmitting signals, and the 5.8GHz antenna at the receiving end of the device is responsible for receiving the 5.8GHz signal transmitted by the previous device. The equipment is also internally provided with a 5.8GHz directional antenna which is mainly responsible for continuously sending out signals received by the external 5.8GHz antenna in the form of 5.8GHz signals. The central control unit of signal transmission in the equipment is responsible for identifying the 5.8GHz signal which needs to be received, the 5.8GHz antenna of the equipment can possibly receive a plurality of 5.8GHz signals from different equipment in the system, the central control unit is responsible for analyzing the received signals, selecting the 5.8GHz signals which can be received by the equipment, and evaluating the signal quality of all the received signals, the quality of the automatically received signals is the best, and the good and minimum attenuation of the signal quality is ensured when the signals are transmitted between the equipment.
As shown in fig. 6, the schematic diagram of the WIFI signal coverage mode includes a 5.8GHz directional antenna built in, and is responsible for receiving a 5.8GHz signal transmitted by the device in the wireless signal relay mode after multistage cascade connection. The WIFI coverage unit in the device is responsible for correspondingly processing the received 5.8GHz signal and covering the signal through the 5.8GHz omnidirectional antenna in the WIFI coverage unit. All devices within the coverage range can be connected with the WIFI signal to establish network connection, and the individual soldier device can establish network connection through connection with the WIFI signal to normally work. And the signal transmission central control unit in the equipment is responsible for controlling the self-adaptive switching unit according to the use types of different equipment to form different working modes. The WIFI coverage unit is responsible for analyzing and recognizing all transmitted 5.8GHz signals, receiving and processing the signals with the best quality, correspondingly setting the WIFI coverage unit, setting the coverage range, monitoring the states of all devices connected with WIFI, and setting WIFI names, passwords and the like.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A communication method of a communication system for subway emergency rescue is characterized in that:
the communication system for subway emergency rescue comprises: PC equipment, a communication server, an internal gateway and each mobile terminal; the PC equipment is in network connection communication with the communication server; the communication server is in network connection communication with the internal gateway; the internal gateway wirelessly communicates with each mobile terminal;
also included is a wireless bridge; the internal gateway wirelessly communicates with each mobile terminal through a wireless bridge;
the wireless bridge comprises a bridge 4G communication module, a WIFI communication module and at least one wireless relay communication module; the internal gateway is connected with a main 4G communication module; the main 4G communication module and the bridge 4G communication module communicate through a 4G network; the wireless relay communication module forms a wireless relay link between the network bridge 4G communication module and the WIFI communication module; the network bridge 4G communication module is in wireless communication with the WIFI communication module through a wireless relay link; the mobile terminal is provided with a WIFI unit; the WIFI communication module is in wireless communication with the WIFI units of the mobile terminals;
the communication server comprises a video streaming media storage server and a video streaming media forwarding server; the video streaming media storage server is communicated with the video streaming media forwarding server, and the video streaming media storage server stores and backups communication data forwarded by the video streaming media forwarding server in real time; the video streaming media forwarding server is respectively connected and communicated with the PC equipment and the internal gateway network and is used for compressing and forwarding communication data;
the mobile terminal is also provided with a 4G unit, and the main 4G communication module is communicated with the 4G units of the mobile terminals through a 4G network;
the communication method of the communication system for subway emergency rescue comprises the following steps:
detecting the 4G network signal intensity of an accident scene, if a 4G unit of the mobile terminal can acquire a 4G network signal, directly transmitting video data by using the 4G network, and if the 4G unit of the mobile terminal cannot acquire the 4G network signal, transmitting the video data by combining a wireless network bridge and the 4G network;
the specific transmission method for transmitting the video data by using the 4G network comprises the following steps:
on one hand, the mobile terminal performs 4G network transmission on the collected video data through a 4G unit and a main 4G communication module of the internal gateway, transmits the video data to the video streaming media forwarding server through the internal gateway network, compresses the video data sent by the internal gateway by using the video streaming media forwarding server, and forwards the video data to the PC equipment;
on the other hand, the PC equipment sends the video data to a video streaming media forwarding server for compression processing, then forwards the video data to the internal gateway, and then carries out 4G network transmission by a main 4G communication module of the internal gateway and a 4G unit of the mobile terminal so as to transmit the video data to the mobile terminal;
in the process of transmitting video data by using a 4G network, a video streaming media storage server stores communication data compressed and forwarded by a backup video streaming media forwarding server in real time;
the specific transmission method for transmitting the video data by combining the wireless network bridge with the 4G network comprises the following steps:
on one hand, the mobile terminal transmits the acquired video data to the wireless network bridge through wireless communication between the WIFI unit and the WIFI communication module, then the WIFI communication module, the wireless relay communication module and the network bridge 4G communication module in the wireless network bridge transmit the video data to the 4G signal coverage area in a multi-stage bridging mode, then the network bridge 4G communication module transmits the video data to the main 4G communication module of the internal gateway through the 4G network, the internal gateway transmits the video data to the video streaming media forwarding server, and then the video streaming media forwarding server compresses the video data sent by the internal gateway and forwards the compressed video data to the PC equipment;
on the other hand, the PC equipment sends the video data to a video streaming media forwarding server for compression processing, then forwards the video data to an internal gateway, a main 4G communication module of the internal gateway and a bridge 4G communication module of a wireless bridge perform 4G network transmission, then the video data are transmitted in a multi-stage bridging mode through a WIFI communication module, a wireless relay communication module and the bridge 4G communication module in the wireless bridge, and the WIFI communication module wirelessly communicates with a WIFI unit of the mobile terminal to send the video data to the mobile terminal;
in the process of transmitting video data by combining the wireless network bridge with the 4G network, the video streaming media storage server stores the communication data compressed and forwarded by the backup video streaming media forwarding server in real time.
2. The communication method of the communication system for subway emergency rescue according to claim 1, characterized in that: in the communication system for subway emergency rescue, the network bridge 4G communication module, the wireless relay communication module and the WIFI communication module have the same hardware structure and are all composed of a signal transmission central control unit, a self-adaptive switching unit, two 5.8GHz built-in directional antennas, a WIFI covering unit, a 4G router unit and an external interface for externally connecting a 4G signal receiving antenna; the signal receiving end is respectively connected with the 4G router unit and one 5.8GHz built-in directional antenna through the self-adaptive switching unit by the signal transmission central control unit, and the signal sending end is respectively connected with the WIFI covering unit and the other 5.8GHz built-in directional antenna through the self-adaptive switching unit by the signal transmission central control unit; the signal receiving end self-adaptive switching unit is used for switching the receiving end to select a 4G router unit or a 5.8GHz built-in directional antenna for signal receiving according to the signal format, and the signal sending end self-adaptive switching unit is used for switching the receiving end to select a WIFI coverage unit or a 5.8GHz built-in directional antenna for signal sending according to the signal format.
3. The communication method of the communication system for subway emergency rescue according to claim 2, characterized in that: in the communication system for subway emergency rescue, the self-adaptive switching unit is used for controlling each hardware structure in the wireless network bridge to be configured into a 4G communication module of the network bridge, a wireless relay communication module and a WIFI communication module; the network bridge 4G communication module, the wireless relay communication module and the WIFI communication module in the wireless network bridge respectively correspond to three working modes, namely a network bridge 4G communication mode, a wireless relay communication mode and a WIFI communication mode, when the equipment is in the network bridge 4G communication mode, the hardware structure is configured to be a 4G router unit and a built-in 5.8GHZ built-in directional antenna, and the 4G router unit is responsible for receiving 4G signals, converting the 4G signals into 5.8GHZ signals and sending the 5.8GHZ signals through the directional antenna; when the device is in a WIFI communication mode, the hardware structure is configured to be a WIFI coverage unit and a built-in 5.8GHZ built-in directional antenna, the built-in 5.8GHZ built-in directional antenna is responsible for receiving a 5.8GHZ signal sent by a link in front of the system, and the WIFI coverage unit is responsible for covering the 5.8GHZ signal through the omnidirectional antenna; when the device is in a wireless relay communication mode, the hardware structure will be configured as two 5.8GHZ built-in directional antennas for receiving and forwarding 5.8GHZ signals, respectively.
4. The communication method of the communication system for subway emergency rescue according to claim 3, characterized in that: in the communication system for subway emergency rescue, three working modes can be manually selected in a setting page of equipment, and the mode of the equipment cannot be changed after manual selection and can be adjusted to be an automatic selection mode; when the equipment is inserted into the 4G card in the automatic mode, the equipment is identified to automatically enter a 4G communication working mode of the network bridge; when the equipment is connected with the omnidirectional antenna, the accessed antenna is automatically identified, and the WIFI communication mode is automatically entered; when the device is accessed without the 4G card and the omnidirectional antenna, the device enters a wireless relay communication mode.
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| CN109526689A (en) * | 2018-10-25 | 2019-03-29 | 天津市科睿思奇智控技术有限公司 | A kind of long-range control method of irrigation and system |
| CN110460986B (en) * | 2019-07-25 | 2021-04-30 | 西安科技大学 | System and method for long-distance multimedia wireless emergency communication in closed space |
| CN111093241A (en) * | 2019-12-30 | 2020-05-01 | 安徽三拓智能科技有限公司 | Intelligent network switching device and switching method |
| CN113453377A (en) * | 2020-03-25 | 2021-09-28 | 驰众信息技术（上海）有限公司 | Method and device for enhancing network access |
| CN114448750A (en) * | 2022-01-19 | 2022-05-06 | 深圳市联洲国际技术有限公司 | Communication method, device, equipment and medium in pure bridge mode |
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