CN110933644A - Train-ground wireless communication system and communication method - Google Patents
Train-ground wireless communication system and communication method Download PDFInfo
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- CN110933644A CN110933644A CN201911122971.2A CN201911122971A CN110933644A CN 110933644 A CN110933644 A CN 110933644A CN 201911122971 A CN201911122971 A CN 201911122971A CN 110933644 A CN110933644 A CN 110933644A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000005540 biological transmission Effects 0.000 description 5
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- 238000010586 diagram Methods 0.000 description 2
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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]
- H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points
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Abstract
The invention discloses a train-ground wireless communication system and a communication method, wherein different communication methods are adopted according to different positions of trains, and the method comprises the steps of adopting a ground antenna to carry out free communication in a tunnel section; at the exit of the tunnel, a method of coexistence of a ground antenna and a leakage cable is adopted to carry out a free communication and leakage wireless communication combination mode; and in the ground and the elevated section, a leakage cable is adopted for carrying out a leakage wireless communication mode. In order to realize a plurality of communication methods, different base station systems are arranged in different sections, and each base station system corresponds to different communication methods. According to the vehicle-ground wireless communication method, aiming at the driving sections in different external environments, two communication devices are arranged on the vehicle-mounted system according to the advantages of various communication modes, and different communication modes are adopted for communication respectively, so that frequency bandwidth resources are effectively utilized, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of vehicle-ground communication, in particular to a vehicle-ground wireless communication system and a communication method.
Background
At present, an LTE system has the characteristics of high bandwidth, high mobility, long-range coverage, high scalability, and the like, can solve the problems of instability, poor mobility, and the like of the existing wireless system, and is currently widely applied to a rail transit vehicle-ground wireless communication system. The LTE frequency band which can be used by division in the rail transit industry is 1.785 GHz-1.805 GHz. At present, the rail transit application environment is mainly divided into a tunnel, a ground and an overhead, the tunnel can be regarded as a closed space, external different network system interference is basically avoided, and an uplink line and a downlink line are divided into two tunnels, so that the uplink line and the downlink line are basically free of interference. The ground and the elevated section are both open spaces, the electromagnetic environment is worse, and the interference is easy to generate with the electric power, petroleum and other special networks which are also approved to adopt the 1.8GHz frequency band, so that the co-frequency interference of different networks is formed. Since the subway 1.8GHz dedicated frequency band is adjacent to the downlink frequency band of the China Mobile DCS1800 system and the uplink frequency band of the China telecom LTE FDD system, no guard band interval exists between the frequency bands, and the subway LTE train-ground wireless system and the related network of the operator may generate adjacent frequency interference.
The main media for wireless communication transmission of rail transit vehicles are free radio, leaky cable and leaky waveguide. Because the free wireless antenna and the leakage cable have certain advantages in cost and construction, for example, communication signals of the free wireless communication technology are transmitted in the air, the wireless communication technology is convenient and simple to arrange, the transmission distance is large, and the range is wide when the transmission antenna is used for transmitting signals. The leaky cable wireless communication technology is to propagate wireless signals by slotting a coaxial cable; the leakage cable radiates signals to the side, so that the leakage cable is easily interfered by the outside and simultaneously interferes the outside; the crack waveguide has the characteristics of low loss, interference resistance and uniform signal distribution, and has very weak influence on other systems.
Thus, generally free wireless and leaky cables are used more often, or a combination of both. The corresponding free wireless vehicle-mounted receiving antenna is generally arranged at the top of the train, the leakage cable is generally arranged at the side surface of the train, and the crack waveguide is arranged on the track bed. In a ground line and an overhead line section, as the vehicle-mounted receiving antenna of the free wireless and leakage cable is arranged at the position of the roof of the car, the external interference signal can be received more easily, and meanwhile, the interference can be caused to the external system, in order to reduce the same frequency interference of the external system, most rail transit owners can only select a frequency band of a certain frequency band within 1.785 GHz-1.805 GHz for use, but can not use all 20MHz, so that the waste of frequency resources is caused. In a more serious case, uplink and downlink lines of the system interfere with each other, and the communication quality is seriously affected.
Therefore, it is an urgent need to solve the above-mentioned problems by designing a train-ground wireless communication system to effectively utilize frequency bandwidth resources and improve system reliability.
Disclosure of Invention
The invention aims to provide a train-ground wireless communication system and a base station system thereof, wherein two communication modes are arranged in the system aiming at different external environments, and the communication modes respectively correspond to the communication in different external environments according to the advantages of the communication modes, so that the aims of effectively utilizing frequency bandwidth resources and improving the reliability of the system are fulfilled.
The above object of the present invention is achieved by the following technical solutions:
a communication method of a train-ground wireless communication system adopts different communication methods according to different positions of trains, and comprises the steps of adopting a ground antenna to carry out free communication in a tunnel section; at the exit of the tunnel, a method of coexistence of a ground antenna and a leakage cable is adopted to carry out a free communication and leakage wireless communication combination mode; and in the ground and the elevated section, a leakage cable is adopted for carrying out a leakage wireless communication mode.
The invention is further configured to: a leaky cable is replaced by a crack waveguide, and at the exit of the tunnel, a free communication and crack waveguide wireless communication combination mode is carried out by adopting a method of coexistence of a ground antenna and the crack waveguide; and in the ground and the elevated section, a crack waveguide is adopted to carry out a crack waveguide wireless communication mode.
The above object of the present invention is also achieved by the following technical solutions:
a train-ground wireless communication system is used for communication between a train and the ground and comprises a first base station system, a second base station system, a third base station system, a first vehicle-mounted transmitting and receiving system, a second vehicle-mounted transmitting and receiving system and a control center, wherein the control center is used for controlling the first vehicle-mounted transmitting and receiving system to be in electric communication with the second base station system according to the position of the train; or the second on-board transmit receive system is in electrical communication with a third base station system; or the first base station system is in electrical communication with either the first on-board transmit receive system or the second on-board transmit receive system.
The invention is further configured to: the second base station system includes a ground-free wireless antenna system and the first on-board transmit receive system includes a ground-free wireless receive system.
The invention is further configured to: the second base station system comprises a crack waveguide wireless system, and the second vehicle-mounted transmitting and receiving system comprises a crack waveguide wireless receiving system.
The invention is further configured to: the second base station system comprises a leaky cable wireless system, and the second vehicle-mounted transmitting and receiving system comprises a leaky cable wireless receiving system.
The invention is further configured to: the second base station system is arranged in the tunnel section, the first base station system is arranged near the tunnel exit, and the third base station system is arranged in the ground/overhead section.
The invention is further configured to: the slot waveguide antenna and the backward antenna in the first base station system are positioned on one side of the third base station system, and the forward antenna is positioned on one side of the second base station system.
The invention is further configured to: the control center comprises a control switch circuit which is used for controlling the first vehicle-mounted transmitting and receiving system or the second vehicle-mounted transmitting and receiving system to work.
The invention is further configured to: the first base station system comprises a base station, antennas and a power divider, wherein the antennas comprise two different types of antennas, the two different types of antennas comprise ground antennas and slot waveguide antennas or ground antennas and leaky cable antennas, the two different types of antennas are respectively connected with the power divider by feeders, and the power divider is electrically connected with the base station.
Compared with the prior art, the invention has the beneficial technical effects that:
1. according to the train-ground wireless communication method, aiming at the travelling sections in different external environments, two communication devices are arranged in the vehicle-mounted system according to the advantages of various communication modes, and different communication modes are adopted for communication respectively, so that frequency bandwidth resources are effectively utilized, and the cost is saved;
2. furthermore, different communication devices are arranged in different sections, and the train is controlled to communicate with the corresponding communication device in each section, so that seamless connection of the train-ground wireless communication system among different communication modes is realized, and the reliability of the system is improved;
3. furthermore, the base station system with two communication modes is arranged, seamless connection of the train between different communication modes of two different sections is achieved, and reliable operation of the train-ground wireless communication system is guaranteed.
Drawings
FIG. 1 is a schematic diagram of a vehicle-to-ground wireless communication system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a base station system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The base station system in the train-ground wireless communication system comprises a base station, a power divider 2, a ground backward antenna 4, a ground forward antenna 41 and a slot waveguide antenna 5, wherein the power divider 2 is respectively connected with the base station, the ground backward antenna 4, the ground forward antenna 41 and the slot waveguide antenna 5 through feeders and is used for carrying out communication through two different types of communication modes of the ground antenna and the slot waveguide antenna, wherein the forward and backward directions of the ground backward antenna 4 and the ground forward antenna 41 are relative, and the real front and back directions correspond to the forward direction of a train. The two antennas in opposite directions are arranged, so that the transmission distance can be prolonged, the number of base stations is reduced, and the cost is saved.
The base station systems are all arranged on the trackside ground, and the base stations are communication signal base stations.
The slot waveguide antenna 5 can also employ a leaky cable antenna.
The train-ground wireless communication system comprises a first base station system, a second base station system, a third base station system, a first vehicle-mounted transmitting and receiving system, a second vehicle-mounted transmitting and receiving system and a control center, wherein the control center is used for controlling the first vehicle-mounted transmitting and receiving system to be in electric communication with the second base station system according to the position of a train; or the second on-board transmit receive system is in electrical communication with a third base station system; or the first base station system is in electrical communication with either the first on-board transmit receive system or the second on-board transmit receive system.
Specifically, the first base station system is shown in fig. 2, and is not described again.
The second base station system comprises a base station 1, a power divider 2, a ground backward antenna 4 and a ground forward antenna, wherein the power divider 2 is connected with the ground backward antenna 4 through a feeder 3 and is respectively connected with the ground forward antenna and the base station 1 through feeders, and the second base station system is used for receiving and amplifying ground antenna signals and then transmitting the signals through the ground antennas. The power divider 2 is used for power division between antennas.
The second base station system comprises a base station, a power divider and a slot waveguide antenna 5, wherein the slot waveguide antenna also comprises a forward slot waveguide antenna and a backward slot waveguide antenna, and the purpose of the setting is to prolong the transmission distance of signals.
The second base station system is arranged in the tunnel section, the first base station system is arranged near the tunnel exit, and the third base station system is arranged in the ground/overhead section.
The slot waveguide antenna and the backward antenna in the first base station system are positioned on one side of the third base station system, and the forward antenna is positioned on one side of the second base station system. In this way, a ground antenna communication system is formed between the second base station system and the first base station system. A communication mode of a crack waveguide is formed between the third base station system and the first base station system, and the signals are completely linked between sections, so that the reliability of the signals in the running process of the train is ensured.
As shown in fig. 2, a first vehicle-mounted transmitting and receiving system and a second vehicle-mounted transmitting and receiving system are arranged on the train 6;
specifically, the first vehicle-mounted transmitting and receiving system comprises a vehicle-mounted receiving antenna 7, a vehicle-mounted wireless terminal 9 and a control center 10. The control center 10 is electrically connected with the vehicle-mounted receiving antenna 7 and the vehicle-mounted wireless terminal 9 respectively and is used for realizing communication with the ground antenna.
The vehicle-mounted receiving antenna 7 is a ground-based free antenna.
The second vehicle-mounted transmitting and receiving system comprises a crack waveguide receiving antenna 8, a vehicle-mounted wireless terminal 9 and a control center 10, wherein the control center 10 is electrically connected with the crack waveguide receiving antenna 8 and the vehicle-mounted wireless terminal 9 respectively and used for realizing communication with the crack waveguide antenna.
And the second base station system and the first vehicle-mounted transmitting and receiving system form ground free wireless communication. Accordingly, the third base station system and the second vehicle-mounted transmitting and receiving system form crack waveguide wireless communication. In the first base station system section, the control center controls the first vehicle-mounted transmitting and receiving system or the second vehicle-mounted transmitting and receiving system to work according to the external environment.
The control center comprises a control switch circuit. Between the first base station system section and the second base station system, the control center controls the first vehicle-mounted transmitting and receiving system to work; between the first base station system section and the third base station system, the control center controls the second vehicle-mounted transmitting and receiving system to enter into work.
In one embodiment of the invention, the second base station system comprises a leaky cable wireless system and the second on-board transmit receive system comprises a leaky cable wireless receive system.
The implementation principle of the embodiment is as follows: because the tunnel section is a relatively closed area, a free wireless communication mode is adopted, the frequency bandwidth is fully utilized, two communication modes exist in the tunnel entrance section because the external environment is semi-closed and semi-open, the communication modes are switched, and the ground/overhead section is communicated by adopting a crack waveguide or leakage wireless communication mode.
According to the method and the device, different communication modes are adopted in different sections, the advantages of various communication modes are fully utilized, and the integrity and the reliability of communication are guaranteed in the whole operation process of the train.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. A communication method of a train-ground wireless communication system is characterized in that: according to different positions of trains, different communication methods are adopted, including a free communication mode in a tunnel section by adopting a ground antenna; at the exit of the tunnel, a method of coexistence of a ground antenna and a leakage cable is adopted to carry out a free communication and leakage wireless communication combination mode; and in the ground and the elevated section, a leakage cable is adopted for carrying out a leakage wireless communication mode.
2. The communication method in the train-ground wireless communication system according to claim 1, wherein: a leaky cable is replaced by a crack waveguide, and at the exit of the tunnel, a free communication and crack waveguide wireless communication combination mode is carried out by adopting a method of coexistence of a ground antenna and the crack waveguide; and in the ground and the elevated section, a crack waveguide is adopted to carry out a crack waveguide wireless communication mode.
3. A train-ground wireless communication system for communication between a train and the ground, comprising: the system comprises a first base station system, a second base station system, a third base station system, a first vehicle-mounted transmitting and receiving system, a second vehicle-mounted transmitting and receiving system and a control center, wherein the control center is used for controlling the first vehicle-mounted transmitting and receiving system to be in electric communication with the second base station system according to the position of a train; or the second on-board transmit receive system is in electrical communication with a third base station system; or the first base station system is in electrical communication with either the first on-board transmit receive system or the second on-board transmit receive system.
4. The vehicle-to-ground wireless communication system according to claim 3, wherein: the second base station system includes a ground-free wireless antenna system and the first on-board transmit receive system includes a ground-free wireless receive system.
5. The vehicle-to-ground wireless communication system according to claim 3, wherein: the second base station system comprises a crack waveguide wireless system, and the second vehicle-mounted transmitting and receiving system comprises a crack waveguide wireless receiving system.
6. The vehicle-to-ground wireless communication system according to claim 3, wherein: the second base station system comprises a leaky cable wireless system, and the second vehicle-mounted transmitting and receiving system comprises a leaky cable wireless receiving system.
7. The vehicle-to-ground wireless communication system according to claim 3, wherein: the second base station system is arranged in the tunnel section, the first base station system is arranged near the tunnel exit, and the third base station system is arranged in the ground/overhead section.
8. The vehicle-to-ground wireless communication system according to claim 7, wherein: the slot waveguide antenna and the backward antenna in the first base station system are positioned on one side of the third base station system, and the forward antenna is positioned on one side of the second base station system.
9. The vehicle-to-ground wireless communication system according to claim 3, wherein: the control center comprises a control switch circuit which is used for controlling the first vehicle-mounted transmitting and receiving system or the second vehicle-mounted transmitting and receiving system to work.
10. The vehicle-to-ground wireless communication system according to claim 3, wherein: the first base station system comprises a base station, antennas and a power divider, wherein the antennas comprise two different types of antennas, the two different types of antennas comprise ground antennas and slot waveguide antennas or ground antennas and leaky cable antennas, the two different types of antennas are respectively connected with the power divider by feeders, and the power divider is electrically connected with the base station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911122971.2A CN110933644A (en) | 2019-11-16 | 2019-11-16 | Train-ground wireless communication system and communication method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911122971.2A CN110933644A (en) | 2019-11-16 | 2019-11-16 | Train-ground wireless communication system and communication method |
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| CN110933644A true CN110933644A (en) | 2020-03-27 |
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| CN201911122971.2A Pending CN110933644A (en) | 2019-11-16 | 2019-11-16 | Train-ground wireless communication system and communication method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115913267A (en) * | 2023-01-04 | 2023-04-04 | 慧铁科技有限公司 | Vehicle-ground high-speed communication device |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115913267A (en) * | 2023-01-04 | 2023-04-04 | 慧铁科技有限公司 | Vehicle-ground high-speed communication device |
| CN115913267B (en) * | 2023-01-04 | 2023-05-30 | 慧铁科技有限公司 | High-speed communication device for vehicle and ground |
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Application publication date: 20200327 |