CN101848470A - Mobile communication system for train in week field intensity area - Google Patents
Mobile communication system for train in week field intensity area Download PDFInfo
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- CN101848470A CN101848470A CN 201010181501 CN201010181501A CN101848470A CN 101848470 A CN101848470 A CN 101848470A CN 201010181501 CN201010181501 CN 201010181501 CN 201010181501 A CN201010181501 A CN 201010181501A CN 101848470 A CN101848470 A CN 101848470A
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Abstract
The invention discloses a system for solving the problem that mobile communication users in a train in week field intensity areas (subways and railway tunnels) keep normal communication. The system is divided into a fixed signal coverage subsystem and a train signal coverage subsystem, wherein the fixed signal coverage subsystem solves the communication of users in substations, underground space and tunnels, and the train signal coverage subsystem solves the normal communication of mobile communication users in the train. The invention is the system which integrates mature technology and products. By using the system, designing andproducts selection and reasonably reasonable construction can be implemented according to the requirements of different frequency ranges, different systems and different networks and a comprehensive system with different frequency ranges, different systems and different networks can also be built.
Description
Technical field
The present invention relates to the mobile communication of train, specifically, is the passenger mobile communication of train when moving in the strong tunnel of feeble field.
Background technology
Various mobile communication are very universal, and various mobile communication system such as GSM, CDMA are being managed, and the signal of 800MHz, 900MHz, 1900MHz frequency band has covered city and intercity 's traffic route; The extensive use too of the group system of 450MHz and specialized mobile radio; Also will realize 3-G (Generation Three mobile communication system) from now on.And trains such as subway and railway are when moving in the strong tunnel of feeble field, and various mobile communication all can not normally be used.For example: No. 2 subway lines in the Pekinese, the mobile phone of various systems can only normally use near the district of station; In train entered the tunnel, the mobile phone in the compartment was with regard to no signal in front, and in the back the mobile phone in compartment through also no signal after several seconds kinds, otherwise, when train was about to enter the station, the mobile phone of preceding carriage had signal earlier, and the mobile phone in compartment, back just has signal before having only the tunnel exit of arrival.Its reason be train in the tunnel extremely to the signal screen covert.
The way of the mobile communication signal that current solution is underground is the antenna reception signal of base station by ground, receives underground antenna through two-way amplifier, transmission cable again, improves underground base station signal; Conversely, after underground antenna received the signal process two-way amplifier amplification of mobile phone, by the antenna emission on ground, the base station received the signal of mobile phone again.Other has, and in the underground base station that directly is provided with, covers the underground space; The subway that has is laid leaky cable in the tunnel, leaky cable one end connects two-way amplifier, and leaky cable is equivalent to the spaced antenna of two-way amplifier, and this way can improve the communication range in the tunnel, switch but can't solve the base station of mobile phone when mobile, communication will be interrupted.
Summary of the invention
The present invention is that the signal covering system by fixing signal covering system and train solves train in running, and the passenger can be as communicating on ground.Principle of the present invention is on the basis of fixing signal covering system, by the signal covering system of train, two base station down signals reasonably is distributed to each compartment; The upward signal that receives the mobile phone in each compartment simultaneously sends relevant base station to; Communicated by letter in specific base by mobile communication system control mobile phone, according to the variation of signal strength, the control mobile phone switches between different base station again.
The present invention adopts mature technique or product, by system design technology and product is reconfigured, and rationally controls the field strength distribution of the uplink and downlink signal of mobile communication.
The objective of the invention is the train mobile communication that realizes that feeble field is distinguished doughtily.
For reaching described purpose, the present invention adopts fixing signal covering system that base station overlay area is expanded in the underground space and the tunnel, promptly in the fixedly amplification system at each station of subway, the downstream signal of base station, place is introduced in the underground space and the tunnel, also the upward signal in the underground space and the tunnel is sent to the base station, place after amplifying.The downstream signal of two base stations is sent into respectively in the tunnel from the two ends in tunnel, forms the field intensity map (see figure 1) of two-way downstream signal.When train 9 travelled in the tunnel, the shielding action of 9 pairs of downstream signals of train had changed foregoing field intensity map (seeing Fig. 2,3,4).Signal covering system by train is introduced each compartment (seeing Fig. 5,6,7) of train with the two-way downstream signal in tunnel, and is same, and the upward signal in the compartment is sent to the tunnel.
System of the present invention divides two subsystems: fixed signal covers subsystem and train signal covers subsystem.Fixed signal covering system (see figure 8) is formed (this subsystem is widely used) by the antenna of ground-plane antenna, two-way amplifier, transmission cable 8 and underground covering, and the field strength distribution in the tunnel as shown in Figure 1.Train signal covers subsystem (seeing Fig. 9,10) and is made up of dual-mode antenna 1, two-way amplifier 2, leaky cable 3.
Two ends at train 9 are provided with antenna 1 respectively, and the antenna 1 of front end receives base station, place, station, the place ahead
1Downstream signal f
Down 1, the antenna 1 of rear end receives base station, place, station, rear
2Signal f
Following 2, the upward signal f of the antenna transmission mobile phone at two ends
OnTwo-way amplifier 2 is formed (seeing Figure 11) by duplexer 21-1, band pass filter 22, descending amplifier 23, upstream amplifier 24 and duplexer 21-2.One end of leaky cable 3 connects the duplexer 21-2 of the two-way amplifier of front end, and the other end connects the duplexer 21-2 of the two-way amplifier of rear end.After 23 pairs of downstream signals of the forward amplifier of train 9 rear and front ends amplify, on leaky cable 3, form the level gradient of downstream signal, around leaky cable 3, form the magnetic field gradient of downstream signal.
Leaky cable 3 has been used widely, and its major parameter is loss and coupling loss; Its characteristic impedance is to select on demand, 50 ohm or 75 ohm of most of selections; It has the amphicheirality of transmission, i.e. the outside of being coupled to cable of downstream signal in the cable by leakage, and simultaneously, the upward signal of cable outside is coupled to the inside of cable, and upward signal is through the input of cable transmission to sign-changing amplifier.Leaky cable has various models and specification: models such as flat recess, Eight characters groove and rare braiding, the not specification in collinear footpath.
When having represented among Fig. 3 that train travels in feeble field is distinguished doughtily, the field strength distribution of downstream signal in the compartment, train 9 in the process of moving, the field intensity of the downstream signal in the compartment constantly changes, the field intensity that the received signal of the mobile phone in the compartment and two base stations receive the upward signal of mobile phone respectively changes, and is to be similar to mobile phone variation on the ground.
Train signal covers subsystem the downstream signal that is shielded by train 9 in the tunnel is introduced the compartment, forms the signal cover of mobile communication in the compartment, and is same, the transmission that also solves upward signal.
Train signal covers subsystem and covers in fixed signal on the basis of subsystem, realizes the train 9 interior mobile communication that feeble field is distinguished doughtily.Fixed signal covering subsystem is transferred to the downstream signal of base station, place, station, the place ahead and base station, place, station, rear in the tunnel, and the two-way downstream signal needs the overlapping area of coverage above train length.
The problem that should note is to distinguish doughtily when sailing to high field and distinguishing doughtily from feeble field when train 9, and train signal covers subsystem can produce the co-channel interference phenomenon, thus cover at train signal need in the subsystem automatically, remote control or manually carry out open and close control.These methods of controlling are very ripe.
Mobile communication for different frequency range need be carried out engineering design and engineering construction separately.For the different operator of same frequency range, select corresponding band pass filter to serve.
Description of drawings
Fig. 1 is a field intensity distribution schematic diagram in the tunnel of fixedly field intensity covering system
Fig. 2 is the field strength distribution schematic diagram of train when entering the tunnel
Fig. 3 is the field strength distribution schematic diagram of train driving when the centre, tunnel
Field strength distribution schematic diagram when Fig. 4 is train arrival tunnel exit
Fig. 5 is a train when entering the tunnel, is provided with the field strength distribution schematic diagram of train field intensity covering system
When Fig. 6 is a train driving in the middle of the tunnel, be provided with the field strength distribution schematic diagram of train field intensity covering system
When Fig. 7 is train arrival tunnel exit, be provided with the field strength distribution schematic diagram of train field intensity covering system
Fig. 8 is that fixedly field intensity covers the subsystem schematic diagram
Fig. 9 is that the train field intensity covers the subsystem schematic diagram
Figure 10 is that another kind of train field intensity covers the subsystem schematic diagram
Figure 11 is the schematic diagram of two-way amplifier
Figure 12 is another kind of two-way amplifier
Embodiment
Describe the present invention below in conjunction with accompanying drawing:
Fig. 1 shows when having only fixing field intensity to cover subsystem, the field intensity map of two-way downstream signal in the tunnel, f among the figure
Following 1Be the downstream signal of base station, place, station, the place ahead, f
Following 2Be the downstream signal of base station, place, station, rear, E
0For mobile phone switches the field intensity value, between a, the b zone of the normal base station shifting of mobile phone.
Fig. 2,3,4 shows when having only fixing field intensity to cover subsystem, the field intensity map of two-way downstream signal in tunnel when train 9 travels in the tunnel, because the shielding action of train 9, the two-way downstream signal does not have overlapping coverage, and the mobile phone in the train can't proper communication.
Fig. 5,6,7 shows and be provided with fixedly field intensity covering subsystem of the present invention and train field intensity covering subsystem, the field intensity map of the two-way downstream signal when train 9 travels in the tunnel and the field intensity map of the two-way downstream signal in the train 9 in the tunnel.F '
Following 1Be the field strength distribution curve of downstream signal in train 9 of base station, the place ahead, F '
Following 2The field strength distribution curve of downstream signal in train 9 for the base station, rear.As can be seen from the figure, the two-way downstream signal in the train 9 has overlapping coverage, and train is at diverse location, and the field intensity of two-way downstream signal is vicissitudinous.Mobile phone in the train is finished from the base station, rear before arriving a position and is switched to base station, the place ahead.
Fig. 8 shows fixedly field intensity covering subsystem, is divided into three spaces: aboveground space, the underground space and tunnel.The antenna 1, the two-way amplifier 2 that point to the base station are set on the ground; By transmission cable 8, enter underground, at the underground antenna 1 that covers the underground space that is provided with; Can also be connected to two-way amplifier 2 by transmission cable 8, the downstream signal of base station is emitted in the tunnel by the directional antenna 1 that is installed in hole or the hole.The measure of the relevant covering underground space is very ripe.
Fig. 9 shows the embodiment that the train field intensity covers subsystem.Rear and front end at train 9 is installed directional antenna 1 respectively, and antenna 1 connects two-way amplifier 2, and another termination of two-way amplifier 2 connects leaky cable 3.The characteristic impedance of leaky cable should be mated with the impedance phase of two-way amplifier; For ease of the marshalling of train, the leaky cable 3 in each compartment connects by cable connector.Downstream signal is radiated the space in each compartment by leaky cable 3, and (mobile phone) upward signal in each compartment is coupled in the leaky cable 3.
Another embodiment is shown in Figure 10, is that another kind of train field intensity covers subsystem.Rear and front end at train 9 is installed directional antenna 1 respectively, and antenna 1 connects two-way amplifier 2, and the descending amplifier 23 of two-way amplifier 2 connects the leaky cable 3-1 of downstream signal, and downstream signal is radiated the space in each compartment by leaky cable 3-1; The upstream amplifier 24 of two-way amplifier 2 connects the leaky cable 3-2 of upward signal, and (mobile phone) upward signal in each compartment is coupled in the leaky cable 3-2.
Two-way amplifier 2 shown in Figure 11.It has two interfaces: antennal interface and leaky cable interface.Antenna termination duplexer 21-1, the descending band pass filter 22-1 input of the termination of duplexer 21-1, the output of band pass filter 22-1 connect descending amplifier 23 inputs, and the output of descending amplifier 23 meets duplexer 21-2; The public termination leaky cable interface of duplexer 21-2; The other end of duplexer 21-2 connects capable band pass filter 22-2 input, and the output of up band pass filter 22-2 connects capable amplifier 24, and the output of upstream amplifier 24 connects the end of duplexer 21-1.
Figure 12 is the two-way amplifier 2 of another embodiment.It has three interfaces: antennal interface, downstream signal output interface, upward signal input interface.The difference of it and two-way amplifier shown in Figure 11 is at the leaky cable end.The output of descending amplifier 23 meets descending circulator 25-1, and the output of descending circulator 25-1 connects down line output (leaky cable) interface; Up input (leaky cable) interface connects the input of up circulator 25-2, and the output of up circulator 25-2 connects line filter 22-2 input, and other is just with shown in Figure 11 the same.
Main feature of the present invention is to cover on the basis of subsystem in fixing field intensity, covers subsystem in conjunction with the train field intensity and forms the mobile communication system for train that feeble field is distinguished doughtily.It has adopted ready-made technology and product, forms new system, has solved the problem of the mobile communication existence of existing many railway tunnel and subway tunnel.
The substance that the train field intensity covers subsystem is the downstream signal that receives mobile communication at the two ends of train, respectively saves the compartment through amplifying the back by what leaky cable was radiated train; Otherwise the upward signal in the compartment is coupled in the leaky cable, after up amplification, sends to relevant base station again.
The train field intensity covers subsystem and adopts different implementation methods, can arrive same purpose.
Can adopt the present invention for different frequency range (800MHz, 900MHz, 1900MHz etc.) with different systems (GSM, CDMA etc.) and different operators (China Mobile, CHINAUNICOM and China Railway Telecom etc.), but need design, select the product of different size respectively and select construction method.Corresponding different frequency range, different systems, different operators need different systems; Can form the compatible system of multisystem through well-designed, suitable product and construction debugging.
*********** ************* ************
In sum, the present invention can solve the train mobile communication that feeble fields such as tunnel are distinguished doughtily.
Claims (5)
1. the point-to-train communication system that feeble field is distinguished doughtily is characterized in that described wireless communication system comprises: the signal covering subsystem of fixing signal covering subsystem and train;
The signal of train covers antenna (1), two-way amplifier (2) and leaky cable (3) composition that subsystem is mounted in the train two ends.
2. system according to claim 1 is characterized in that, connects a leaky cable (3) between two two-way amplifiers (2) of the signal covering subsystem of train.
3. system according to claim 1 is characterized in that, two two-way amplifiers (2) that the signal of train covers subsystem have connection two leaky cables (3) between downstream signal output interface and the upward signal input interface;
Connect a leaky cable (3) between two downstream signal output interfaces, connect another leaky cable (3) between two upward signal input interfaces.
4. the system above-mentioned according to claim 2, it is characterized in that, described two-way amplifier (2) comprising: antennal interface and leaky cable interface, duplexer (21-1), band pass filter (22), descending amplifier (23), upstream amplifier (24) and duplexer (21-2) are formed.
5. system according to claim 3, it is characterized in that, described two-way amplifier (2) comprising: antennal interface, downstream signal output interface and upward signal input interface, duplexer (21-1), band pass filter (22), descending amplifier (23), descending circulator (25-1) upstream amplifier (24) and up circulator (25-2) are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010181501 CN101848470A (en) | 2010-05-25 | 2010-05-25 | Mobile communication system for train in week field intensity area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010181501 CN101848470A (en) | 2010-05-25 | 2010-05-25 | Mobile communication system for train in week field intensity area |
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| CN101848470A true CN101848470A (en) | 2010-09-29 |
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| CN 201010181501 Pending CN101848470A (en) | 2010-05-25 | 2010-05-25 | Mobile communication system for train in week field intensity area |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103517285A (en) * | 2012-06-26 | 2014-01-15 | 中国移动通信集团广东有限公司 | Method and system for coverage performance evaluation of antenna |
| CN103826961A (en) * | 2011-09-30 | 2014-05-28 | 日本信号株式会社 | On-ground device for train control system |
| CN104125007A (en) * | 2014-07-07 | 2014-10-29 | 江苏中寰卫星导航通信有限公司 | Wireless transmitting structure for subway |
| CN107991936A (en) * | 2017-12-25 | 2018-05-04 | 天津七二通信广播股份有限公司 | The control circuit and implementation method of compatible 450MHz, 800MHz channel device |
| CN110574300A (en) * | 2017-03-31 | 2019-12-13 | 纳塔利亚·波里索夫纳·费多索夫 | method and system for mobile communication of extended stations |
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| WO2005036825A1 (en) * | 2003-10-09 | 2005-04-21 | Matsushita Electric Industrial Co., Ltd. | Radio transmission system for high-speed mobile unit |
| CN1994800A (en) * | 2006-12-29 | 2007-07-11 | 北京交通大学 | Method and system for realizing train positioning and real-time tracking by using leakage coaxial cable |
| CN101166266A (en) * | 2006-10-19 | 2008-04-23 | 周叔一 | Secure visual bidirectional monitoring system for railway cross |
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2010
- 2010-05-25 CN CN 201010181501 patent/CN101848470A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005036825A1 (en) * | 2003-10-09 | 2005-04-21 | Matsushita Electric Industrial Co., Ltd. | Radio transmission system for high-speed mobile unit |
| CN101166266A (en) * | 2006-10-19 | 2008-04-23 | 周叔一 | Secure visual bidirectional monitoring system for railway cross |
| CN1994800A (en) * | 2006-12-29 | 2007-07-11 | 北京交通大学 | Method and system for realizing train positioning and real-time tracking by using leakage coaxial cable |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103826961A (en) * | 2011-09-30 | 2014-05-28 | 日本信号株式会社 | On-ground device for train control system |
| CN103517285A (en) * | 2012-06-26 | 2014-01-15 | 中国移动通信集团广东有限公司 | Method and system for coverage performance evaluation of antenna |
| CN103517285B (en) * | 2012-06-26 | 2017-02-01 | 中国移动通信集团广东有限公司 | Method and system for coverage performance evaluation of antenna |
| CN104125007A (en) * | 2014-07-07 | 2014-10-29 | 江苏中寰卫星导航通信有限公司 | Wireless transmitting structure for subway |
| CN110574300A (en) * | 2017-03-31 | 2019-12-13 | 纳塔利亚·波里索夫纳·费多索夫 | method and system for mobile communication of extended stations |
| CN107991936A (en) * | 2017-12-25 | 2018-05-04 | 天津七二通信广播股份有限公司 | The control circuit and implementation method of compatible 450MHz, 800MHz channel device |
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Application publication date: 20100929 |