CN107613455A - Rail vehicle earth communication system - Google Patents
Rail vehicle earth communication system Download PDFInfo
- Publication number
- CN107613455A CN107613455A CN201711002096.5A CN201711002096A CN107613455A CN 107613455 A CN107613455 A CN 107613455A CN 201711002096 A CN201711002096 A CN 201711002096A CN 107613455 A CN107613455 A CN 107613455A
- Authority
- CN
- China
- Prior art keywords
- trackside
- tailstock
- headstock
- train
- directional aerial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The invention discloses a kind of rail vehicle earth communication system, the rail vehicle earth communication system includes trackside fixed network system, vehicle-mounted mobile module and control centre's system；The trackside fixed network system includes multiple trackside radio-cells, and the multiple trackside radio-cell includes trackside mesh nodes, the first trackside directional aerial and the second trackside directional aerial along train rail linear array, each described trackside radio-cell；The vehicle-mounted mobile module includes the headstock mobile unit for being arranged at train head position and the tailstock mobile unit for being arranged at train tailstock position；Control centre's system includes mobile controller.The present invention can improve the reliability that train communicates in high-speed cruising between car ground.
Description
Technical field
The present invention relates to communication technical field, and in particular to a kind of rail vehicle earth communication system.
Background technology
In recent years, as economic development and the acceleration of urbanization process, urban track traffic obtain in each big city in the whole nation
Quick development, with its it is convenient and swift, safe and reliable, haulage capacity is strong outstanding advantages of, turn into alleviate urban traffic blocking,
Realize the optimal solution route of unimpeded trip, track traffic as mobility is high, public place of personnel's high concentration, exist compared with
Big network demand and more unsafe factor, therefore, that how to improve that train communicates in high-speed cruising between car ground can
It is current urgent problem to be solved by property.
The content of the invention
It is an object of the invention to provide a kind of rail vehicle earth communication system, can improve train in high-speed cruising
The reliability to be communicated between car ground.
To achieve the above object, technical scheme provides a kind of rail vehicle earth communication system, including rail
Other fixed network system, vehicle-mounted mobile module and control centre's system；
The trackside fixed network system includes multiple trackside radio-cells, and the multiple trackside radio-cell is along train rail
Road linear array, each described trackside radio-cell include trackside mesh nodes, the first trackside directional aerial and the second rail
Other directional aerial, wherein, backwards to installing, first trackside is determined for the first trackside directional aerial and the second trackside directional aerial
Direction is driven into antenna opposing train, the second trackside directional aerial opposing train sails out of direction；
The vehicle-mounted mobile module includes being arranged at the headstock mobile unit of train head position and is arranged at train car
The tailstock mobile unit of tail position, the headstock mobile unit include headstock mesh nodes and headstock directional aerial, the car
Head directional aerial is to the traveling front to the train, and the tailstock mobile unit includes tailstock mesh nodes and the tailstock orients
Antenna, the tailstock mesh nodes are connected with the headstock mesh nodes, and the tailstock directional aerial is to the row of the train
Rear is sailed, the headstock mobile unit is used to establish the first communication link, the tailstock with the trackside radio-cell in front of train
Mobile unit is used to establish the second communication link with the trackside radio-cell at train rear；
Control centre's system includes mobile controller, and the mobile controller is used for according to first communication link
RSSI value and the RSSI value of second communication link selected from first communication link and second communication link
Select the communication link as data transfer.
Further, the first trackside directional aerial and the second trackside directional aerial are 2x2MIMO sectors
Antenna.
Further, the headstock directional aerial and the tailstock directional aerial are 2x2MIMO fan antennas.
Further, the rail vehicle earth communication system also includes the station net being connected with control centre's system
Network system, the trackside radio-cell connect the station network system by fiber link.
Further, the station network system includes the first interchanger and the gateway being connected with first interchanger
Server.
Further, control centre's system also includes the second switch being connected with the mobile controller, described
Second switch is connected by netting twine with first interchanger.
Further, first interchanger is Layer 2 switch, and the second switch is three-tier switch.
Further, the headstock mobile unit also includes the 3rd switch being connected with the headstock mesh nodes, institute
Stating tailstock mobile unit also includes the 4th interchanger that is connected with the tailstock mesh nodes, the 3rd switch and described the
It is connected between four interchangers by fiber link.
Further, the 3rd switch and the 4th interchanger are respectively connected with In-vehicle networking equipment.
Further, the vehicle-mounted network equipment includes following at least one：
IP video cameras, network hard disk video recorder, wifi devices.
Rail vehicle earth communication system provided by the invention, can be with the trackside in front of train by headstock mobile unit
Radio-cell establishes the first communication link, and second can be established with the trackside radio-cell at train rear by tailstock mobile unit
Communication link, mobile controller can detect the RSSI value of the first communication link and the second communication link in real time, and therefrom select
As the communication link of data transfer between car ground, so as to improve train communicated in high-speed cruising between car ground it is reliable
Property.
Brief description of the drawings
Fig. 1 is a kind of rail vehicle earth communication system that embodiment of the present invention provides；
Fig. 2 is another rail vehicle earth communication system that embodiment of the present invention provides.
Embodiment
With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
Referring to Fig. 1, Fig. 1 be embodiment of the present invention provide a kind of rail vehicle earth communication system, the track traffic
Land mobile communication system includes trackside fixed network system 100, vehicle-mounted mobile module 200 and control centre's system 300；
The trackside fixed network system 100 includes multiple trackside radio-cells, the multiple trackside radio-cell edge row
Car rail linear arranges, and each described trackside radio-cell includes trackside mesh nodes, the first trackside directional aerial and the
Two trackside directional aerials, wherein, the first trackside directional aerial and the second trackside directional aerial are backwards to installation, first rail
Other directional aerial opposing train drives into direction, and the second trackside directional aerial opposing train sails out of direction；
The vehicle-mounted mobile module 200 includes being arranged at the headstock mobile unit of train head position and is arranged at train
The tailstock mobile unit of tailstock position, the headstock mobile unit includes headstock mesh nodes and headstock directional aerial, described
Headstock directional aerial is to the traveling front to the train, and the tailstock mobile unit includes tailstock mesh nodes and the tailstock is determined
To antenna, the tailstock mesh nodes are connected with the headstock mesh nodes, and the tailstock directional aerial is to the train
Rear is travelled, the headstock mobile unit is used to establish the first communication link, the car with the trackside radio-cell in front of train
Tail mobile unit is used to establish the second communication link with the trackside radio-cell at train rear；
Control centre's system 300 includes mobile controller, and the mobile controller is used for according to the described first communication
The RSSI value of link and the RSSI value of second communication link are from first communication link and second communication link
In be selected as the communication link of data transfer.
Embodiment of the present invention provide rail vehicle earth communication system, by headstock mobile unit can with before train
The trackside radio-cell of side establishes the first communication link, can be with the trackside radio-cell at train rear by tailstock mobile unit
The second communication link is established, mobile controller can detect the RSSI value of the first communication link and the second communication link in real time, and
The communication link of data transfer between car ground is therefrom selected as, is led to so as to improve train in high-speed cruising between car ground
The reliability of letter.
For example, in embodiments of the present invention, the first trackside directional aerial and the second trackside directional aerial
Can be 2x2MIMO fan antennas.
For example, in embodiments of the present invention, the headstock directional aerial and the tailstock directional aerial can be
2x2MIMO fan antennas.
Preferably, in embodiments of the present invention, the rail vehicle earth communication system also include with the control
The connected station network system of system is felt concerned about, the trackside radio-cell connects the station network system by fiber link.Its
In, the station network system includes the first interchanger and the gateway server being connected with first interchanger.
Preferably, in embodiments of the present invention, control centre's system also includes being connected with the mobile controller
Second switch, the second switch is connected by netting twine with first interchanger.
Preferably, in embodiments of the present invention, first interchanger is Layer 2 switch, and the second switch is
Three-tier switch.Because the network of station network system is Layer 2 switch structure, it is transmitted for three-tier switch
Layer is transparent, therefore, supports broadcast addressing function.
Preferably, in embodiments of the present invention, the headstock mobile unit also includes and the headstock mesh node phases
3rd switch even, the tailstock mobile unit also includes the 4th interchanger being connected with the tailstock mesh nodes, described
It is connected between 3rd switch and the 4th interchanger by fiber link.
Preferably, in embodiments of the present invention, the 3rd switch and the 4th interchanger are respectively connected with vehicle-mounted net
Network equipment.For example, the vehicle-mounted network equipment can include following at least one：IP video cameras, network hard disk video recorder,
Wifi devices.
Referring to Fig. 2, Fig. 2 is another rail vehicle earth communication system that embodiment of the present invention provides, and the track is handed over
The earth communication system that is open to traffic is included in trackside fixed network system, several station network systems, vehicle-mounted mobile module and control
Feel concerned about system；
Wherein, trackside fixed network system includes multiple trackside radio-cells, and the plurality of trackside radio-cell is along train rail
Road linear array, each described trackside radio-cell include trackside mesh nodes 111, the first trackside directional aerial 112 and
Second trackside directional aerial 113, wherein, the first trackside directional aerial 112 and the second trackside directional aerial 113 are backwards to peace
Dress, the opposing train of the first trackside directional aerial 112 drive into direction, and the opposing train of the second trackside directional aerial 113 is sailed
From direction；
Vehicle-mounted mobile module includes being arranged at the headstock mobile unit of train head position and is arranged at train tailstock position
The tailstock mobile unit put, wherein, headstock mobile unit includes headstock mesh nodes 211, headstock directional aerial 212 and the 3rd
Interchanger 213,3rd switch 213 are connected with headstock mesh nodes 211, and the headstock directional aerial 212 is to the train
Traveling in front of, the tailstock mobile unit include tailstock mesh nodes 221, the interchanger of tailstock directional aerial 222 and the 4th
223, the 4th interchanger 223 is connected with tailstock mesh nodes 221, and the tailstock directional aerial 222 is to the traveling of the train
Rear, it is connected between 3rd switch 213 and the 4th interchanger 223 by fiber link, wherein, the headstock mobile unit is used
In establishing the first communication link with the trackside radio-cell in front of train, the tailstock mobile unit is used for the rail with train rear
Other radio-cell establishes the second communication link, wherein, the interchanger 223 of 3rd switch 213 and the 4th can be Layer2 switching
Machine, the interchanger 223 of 3rd switch 213 and the 4th can be respectively connected with IP video cameras and network hard disk video recorder；
Each station network system is used to form a sub- mesh network, with the trackside radio-cell of management configuration quantity,
Each station network system includes the first interchanger 410 and the gateway server being connected with the first interchanger 410, and first hands over
Change planes and 410 the network system trackside radio-cells that are managed in station are connected by fiber link, due to all trackside mesh nodes
All by wired connection, therefore each trackside mesh nodes are network gateway interconnection (NGI, Network Gateway
Interconnect) node, gateway server is unique gateway that communication flows into or out mesh network, for preventing because of multiple NGI
Point neither one gateway and may caused by annular exchange, to avoid the occurrence of such a situation, can with it is every setting quantity (such as 30
It is individual) trackside mesh nodes one sub- mesh network of composition, it is managed under the control of gateway server, each sub- mesh network configuration
Two gateway servers, including primary gateway server 421 and from gateway server 422, primary gateway is used as from gateway server 422
The redundancy backup of server 421, gateway server are commonly connected to station network system with the trackside mesh nodes managed
First interchanger 410；
Control centre's system includes mobile controller 310, second switch 320 and wireless management server 330, its
In, mobile controller 310 and wireless management server 330 are connected to second switch 320, and second switch 320 passes through net
Line is connected to the first interchanger 410 of each station network system；
Wherein, the mobile controller is used for the RSSI value according to first communication link and second communication chain
The RSSI value on road is selected as the communication link of data transfer from first communication link and second communication link；Example
Such as, mobile controller can detect the first communication link that vehicle-mounted mobile module currently established and the second communication link in real time
RSSI value, if the RSSI value of the first communication link is less than preset value and the RSSI value of the second communication link is more than preset value, control
Vehicle-mounted mobile module processed uses communication link of second communication link as data transfer between car ground, otherwise, then using first
Communication link of the communication link as data transfer between car ground；
In embodiments of the present invention, headstock mesh nodes are in communications status, headstock with tailstock mesh nodes all the time
The data message that mesh nodes receive can send tailstock mesh nodes to, and headstock mesh node device is under normal circumstances
Trackside mesh nodes in front of working condition, with train establish data transmission channel, data by headstock mesh nodes send to
Control centre's system.In this mode, all IP video data streams all transmit via headstock mesh nodes, are saved in headstock mesh
During point work, tailstock mesh nodes are in holding state；
When headstock mesh nodes are normal work (being into data transfer between ground of driving a vehicle), tailstock mesh nodes are then automatic
It is set as only connection not transmission state, headstock mesh nodes and car into holding state, and by the second communication link established
Tail mesh nodes are in interactive state all the time, and confirm mutual state at any time to keep one of them as work, another
For holding state.
For example, when the RSSI value for the first communication link that headstock mesh nodes are established is less than preset value and tailstock mesh nodes
When the RSSI value of the second communication link established is more than preset value, tailstock mesh nodes can switch to working condition and recovery the at once
Two communication links are transmission state；
(such as RSSI value for the first communication link that headstock mesh nodes are established when headstock mesh nodes recover normal condition
During more than or equal to preset value), the first communication that mobile controller control vehicle-mounted mobile module is established using headstock mesh nodes
Communication link of the link as data transfer between car ground, now, tailstock mesh nodes revert to holding state automatically；
The parameters of all trackside mesh nodes can be configured by wireless management server 330, show trackside
The connection of mesh nodes, running status, including transmission power, frequency, channel, the data packet number sent and received, VLAN
Setting and division, QoS setting, multicast, transmission priority, encryption set etc.；
Wherein, in embodiments of the present invention, user can also can set above-mentioned preset value by mobile controller,
And it can be authenticated by mobile controller to entering all mobile nodes in network, for preventing uncommitted movement
Node enters in network, for example, the device authentication inventory that can be prestored in mobile controller, the identity letter comprising headstock mesh nodes
The identity information of breath and tailstock mesh nodes.
The rail vehicle earth communication system that embodiment of the present invention provides, it is possible to reduce because headstock mobile unit occurs
Failure and then the generation for influenceing data transmission scenarios between car ground, effectively improve what train communicated in high-speed cruising between car ground
Reliability.
Although above with general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to the scope of protection of present invention.
Claims (10)
- A kind of 1. rail vehicle earth communication system, it is characterised in that including trackside fixed network system, vehicle-mounted mobile module with And control centre's system；The trackside fixed network system includes multiple trackside radio-cells, and the multiple trackside radio-cell is along train rail line Property arrangement, each described trackside radio-cell determines including trackside mesh nodes, the first trackside directional aerial and the second trackside To antenna, wherein, backwards to installing, first trackside orients day for the first trackside directional aerial and the second trackside directional aerial Line opposing train drives into direction, and the second trackside directional aerial opposing train sails out of direction；The vehicle-mounted mobile module includes being arranged at the headstock mobile unit of train head position and is arranged at train tailstock position The tailstock mobile unit put, the headstock mobile unit include headstock mesh nodes and headstock directional aerial, and the headstock is determined To antenna to the traveling front to the train, the tailstock mobile unit includes tailstock mesh nodes and tailstock orientation day Line, the tailstock mesh nodes are connected with the headstock mesh nodes, and the tailstock directional aerial is to the traveling of the train Rear, the headstock mobile unit are used to establish the first communication link with the trackside radio-cell in front of train, and the tailstock moves Moving cell is used to establish the second communication link with the trackside radio-cell at train rear；Control centre's system includes mobile controller, and the mobile controller is used for according to first communication link RSSI value and the RSSI value of second communication link select from first communication link and second communication link Communication link as data transfer.
- 2. rail vehicle earth communication system according to claim 1, it is characterised in that the first trackside directional aerial And the second trackside directional aerial is 2x2MIMO fan antennas.
- 3. rail vehicle earth communication system according to claim 1, it is characterised in that the headstock directional aerial and The tailstock directional aerial is 2x2MIMO fan antennas.
- 4. rail vehicle earth communication system according to claim 1, it is characterised in that the rail transit field communication System also includes the station network system being connected with control centre's system, and the trackside radio-cell is connected by fiber link Connect the station network system.
- 5. rail vehicle earth communication system according to claim 4, it is characterised in that the station network system includes First interchanger and the gateway server being connected with first interchanger.
- 6. rail vehicle earth communication system according to claim 5, it is characterised in that control centre's system is also wrapped The second switch being connected with the mobile controller is included, the second switch passes through netting twine and the first interchanger phase Even.
- 7. rail vehicle earth communication system according to claim 6, it is characterised in that first interchanger is two layers Interchanger, the second switch are three-tier switch.
- 8. rail vehicle earth communication system according to claim 1, it is characterised in that the headstock mobile unit is also wrapped The 3rd switch being connected with the headstock mesh nodes is included, the tailstock mobile unit also includes and the tailstock mesh nodes The 4th connected interchanger, it is connected between the 3rd switch and the 4th interchanger by fiber link.
- 9. rail vehicle earth communication system according to claim 8, it is characterised in that the 3rd switch and Four interchangers are respectively connected with In-vehicle networking equipment.
- 10. rail vehicle earth communication system according to claim 9, it is characterised in that the vehicle-mounted network equipment bag Include following at least one：IP video cameras, network hard disk video recorder, wifi devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711002096.5A CN107613455A (en) | 2017-10-24 | 2017-10-24 | Rail vehicle earth communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711002096.5A CN107613455A (en) | 2017-10-24 | 2017-10-24 | Rail vehicle earth communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107613455A true CN107613455A (en) | 2018-01-19 |
Family
ID=61079528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711002096.5A Pending CN107613455A (en) | 2017-10-24 | 2017-10-24 | Rail vehicle earth communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107613455A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109625030A (en) * | 2018-11-08 | 2019-04-16 | 交控科技股份有限公司 | A kind of data transmission system and method for rail traffic |
| CN109747683A (en) * | 2018-03-15 | 2019-05-14 | 比亚迪股份有限公司 | Train-ground communication method, system and mobile unit |
| CN110708683A (en) * | 2019-10-30 | 2020-01-17 | 湖南中车时代通信信号有限公司 | Train operation control method and device and computer readable medium |
| CN113411774A (en) * | 2021-08-17 | 2021-09-17 | 深圳电通信息技术有限公司 | Ad-hoc network-based train group control method and device |
| CN114071413A (en) * | 2021-10-15 | 2022-02-18 | 交控科技股份有限公司 | Rail transit wireless communication architecture |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1852190A (en) * | 2005-08-15 | 2006-10-25 | 华为技术有限公司 | Access-in spot switching-over method and wireless local network using same |
| CN101934804A (en) * | 2010-07-29 | 2011-01-05 | 北京交通大学 | Switch method of vehicle-ground wireless communication of urban railway transport system |
| CN102869061A (en) * | 2011-07-07 | 2013-01-09 | 上海中科高等研究院 | Seamless switching method of rail traffic communication system based on WLAN (wireless local area network) |
| CN105704740A (en) * | 2015-06-29 | 2016-06-22 | 南方银谷科技有限公司 | Train vehicle-ground communication network system |
| CN207560355U (en) * | 2017-10-24 | 2018-06-29 | 北京艾恩斯网络科技有限公司 | Rail vehicle earth communication system |
-
2017
- 2017-10-24 CN CN201711002096.5A patent/CN107613455A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1852190A (en) * | 2005-08-15 | 2006-10-25 | 华为技术有限公司 | Access-in spot switching-over method and wireless local network using same |
| CN101934804A (en) * | 2010-07-29 | 2011-01-05 | 北京交通大学 | Switch method of vehicle-ground wireless communication of urban railway transport system |
| CN102869061A (en) * | 2011-07-07 | 2013-01-09 | 上海中科高等研究院 | Seamless switching method of rail traffic communication system based on WLAN (wireless local area network) |
| CN105704740A (en) * | 2015-06-29 | 2016-06-22 | 南方银谷科技有限公司 | Train vehicle-ground communication network system |
| WO2017000574A1 (en) * | 2015-06-29 | 2017-01-05 | 南方银谷科技有限公司 | Train-to-ground communication network system |
| CN207560355U (en) * | 2017-10-24 | 2018-06-29 | 北京艾恩斯网络科技有限公司 | Rail vehicle earth communication system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109747683A (en) * | 2018-03-15 | 2019-05-14 | 比亚迪股份有限公司 | Train-ground communication method, system and mobile unit |
| CN109625030A (en) * | 2018-11-08 | 2019-04-16 | 交控科技股份有限公司 | A kind of data transmission system and method for rail traffic |
| CN110708683A (en) * | 2019-10-30 | 2020-01-17 | 湖南中车时代通信信号有限公司 | Train operation control method and device and computer readable medium |
| CN110708683B (en) * | 2019-10-30 | 2022-12-16 | 湖南中车时代通信信号有限公司 | Train operation control method and device and computer readable medium |
| CN113411774A (en) * | 2021-08-17 | 2021-09-17 | 深圳电通信息技术有限公司 | Ad-hoc network-based train group control method and device |
| CN114071413A (en) * | 2021-10-15 | 2022-02-18 | 交控科技股份有限公司 | Rail transit wireless communication architecture |
| CN114071413B (en) * | 2021-10-15 | 2024-03-15 | 交控科技股份有限公司 | Wireless communication architecture for rail transit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107613455A (en) | Rail vehicle earth communication system | |
| Chen et al. | Development trends of mobile communication systems for railways | |
| EP3047678B1 (en) | High-speed mobile broadband network access via programmed tracking of a sequence of wireless broadband data links | |
| CN107911847A (en) | Parallel WLAN and LTE system and application method in train-ground communication | |
| CN106428117B (en) | The wireless communication coverage method of rail transit train | |
| US8687612B2 (en) | IP communication architecture between the ground and a vehicle | |
| CN103763679B (en) | Track traffic operation control and train-ground wireless communication integrated system and method | |
| CN101304910A (en) | Communication system and method for vehicles and line | |
| CN104580295A (en) | Intelligent broadband communication method and system used for high-speed train in moving state | |
| CN101754292A (en) | Seamless roaming method for train-ground communication of rail transportation | |
| CN207560355U (en) | Rail vehicle earth communication system | |
| CN110049468B (en) | Train-ground wireless communication system of medium-high speed maglev train | |
| CN107613539A (en) | Vehicle-ground wireless communication system | |
| CN113965910B (en) | Redundant networking architecture for vehicle-ground communication | |
| CN114071413B (en) | Wireless communication architecture for rail transit | |
| CN105691416B (en) | A kind of rail transit train information system based on wireless Mesh netword | |
| CN106875501A (en) | A kind of highway tolling system multichannel connection communication method | |
| CN108737466A (en) | Based on GSMR networks and data radio station with realizing STP system vehicles redundance communicating method | |
| CN101568019A (en) | Double-network redundant rail transit field video transmission system | |
| CN206100075U (en) | Train control service bearing system | |
| CN207842955U (en) | Train communication system | |
| CN115140126A (en) | Digital wireless communication method for general-speed railway train operation control | |
| CN108966368B (en) | Networking method and system of LTE private network in public security field | |
| CN107613268A (en) | Video monitoring system for railway track | |
| CN110290042A (en) | Transfers net system for rail traffic |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |