CN100579276C - Trans zone quick switching method for rail communication radio local area network - Google Patents
Trans zone quick switching method for rail communication radio local area network Download PDFInfo
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- CN100579276C CN100579276C CN200610029233A CN200610029233A CN100579276C CN 100579276 C CN100579276 C CN 100579276C CN 200610029233 A CN200610029233 A CN 200610029233A CN 200610029233 A CN200610029233 A CN 200610029233A CN 100579276 C CN100579276 C CN 100579276C
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Abstract
This invention relates to a method for quick switch of cross the region of WLAN used in railway communication, which sets up train-ground communication between train-carrier radio transceiver set on the orbit train and that set beside the orbit characterizing in setting at least two train-carried radio transceivers on the train and said transceivers set by the side of orbit are distributed along the orbit , the train-carried device tests the signal strength of the adjacent by-the-side of the orbit devices timely, and a pair with the strongest signal sets up a train-ground working link for communication, when the signal strength is smaller than a scheduled one, it reselects a pair with the strongest signal as a new train-ground communication link, when the new one is started up to work to begin transmitting communication services carried by the original link, the original link is closed down so as to realize seamless quick cross the region switch.
Description
Technical field
The present invention relates to the communications field, the broadband wireless communications field in the track traffic especially, the particularly handover problem of communication network, concrete is a kind of WLAN (wireless local area network) trans zone quick switching method that is used for rail communication.
Background technology
The track traffic passenger is numerous, and personnel are crowded, usually are in overload operation, in case emergency occurs particularly serious accident takes place easily.The real-time video monitoring of track traffic is an emphasis in the public safety work always.
In the prior art, the video monitoring technology of subway station and platform is all very ripe and be used widely, but the train inside of concentrating the most as personnel is the blind spot of video monitoring, and its reason mainly is to realize that the real-time video monitoring to subway train must satisfy following three conditions simultaneously: 1, adapt to the communication that train is run at high speed; 2, the communication network that is fit to the subterranean tunnel particular surroundings; 3, the high bandwidth communications link that is fit to video monitoring.
In the prior art; almost there is not the ripe communication technology can satisfy above three conditions preferably simultaneously; the researcher proposes numerous experimental programs at the real-time video monitoring in the train for this reason; the communication mode that is based on wireless local area network technology that people had an optimistic view of the most wherein; the numerous domestic and international communication common carrier that comprises international communication giants such as Alcatel is all attempting utilizing wireless local area network technology to make up communication network between train and the rail side; but owing to do not provide support to high-speed mobile communications and seamless fast roaming based on the wireless local area network technology self of IEEE802.11 serial protocols; and the signal cover of single node is less in the wireless local area network technology; this just makes when train passes through a plurality of WLAN continuously in advancing fast, usually can show the problem of the interruption of district more of wireless signal.Therefore, how to guarantee that the advance quick handover of the wireless signal in interval of train is a core technology that realizes the inner real-time video monitoring of train.
Companies such as present Alcatel use for reference " soft handover " technology in the mobile communication, propose " pre-switch " notion of WLAN (wireless local area network), be known as and can realizing switching fast between two adjacent WLAN (wireless local area network) in the time slot about 40 milliseconds.Just read up the literature as can be known, this technology does not also obtain extensively commercial actual verification.In addition, this Technology Need upgrades existing WLAN devices comprehensively, can't utilize existing WLAN (wireless local area network) transceiver.Domestic also have numerous researchs in this field, but do not see effective and feasible case.
Real-time video monitoring in the train is related to social public security, and relation is the vital interests of the people, is an application technology that country presses for.For the track traffic and the public safety of China great and profound significance is arranged all for the research of this problem and proposition with solution of independent intellectual property right.
On the other hand, the intelligentized construction of subway at any time, the communication link that train also needs to set up the broadband with the platform fixed network is taken advantage of to realize that Customer information is led, and Ads on Vehicles is thrown and is broadcast numerous business such as vehicular interaction amusement.Therefore, solve the quick handover problem of WLAN (wireless local area network), just can solve the broadband connections problem between other network of train and rail or the platform network, and then can provide one to support multiple broadband upstream, the descending or comprehensive platform of interactive service.
Summary of the invention
The purpose of this invention is to provide a kind of WLAN (wireless local area network) trans zone quick switching method that is used for rail communication, the described this WLAN (wireless local area network) trans zone quick switching method that is used for rail communication will solve that the prior art handover is not supported or the technical problem that the handover time delay is long.
To achieve the above object of the invention, the present invention adopts following technical proposals:
The WLAN (wireless local area network) trans zone quick switching method that is used for rail communication of the present invention, set up train-ground communication by being arranged at the onboard wireless transceiver on the track train and being arranged between the other wireless transmitting-receiving equipments of rail on track next door, it is characterized in that, described track train is provided with at least two described onboard wireless transceivers, the other wireless transmitting-receiving equipments of described rail distributes along track circuit and is provided with, described onboard wireless transceiver detects the signal strength signal intensity of the other wireless transmitting-receiving equipments of contiguous rail in real time, the other wireless transmitting-receiving equipments of onboard wireless transceiver and rail is set up the train-ground communication active link between the strongest a pair of of signal each other and is carried out train-ground communication, when the communication signal strength of train-ground communication active link during less than predetermined value, again select the other wireless transmitting-receiving equipments new train-ground communication active link of a pair of conduct that signal is the strongest each other of current time onboard wireless transceiver and rail, treat new train-ground communication active link startup work and when beginning to transmit the communication service of carrying on original train-ground communication active link, close original train-ground communication active link again.
The described track train headstock and the tailstock respectively are provided with a described onboard wireless transceiver.A data control centre is set ON TRAINS, on the track train all onboard wireless transceivers all pass through wireline communication network (as, Ethernet) or cordless communication network (as, WLAN) be connected to Data Control Center, for fear of the influence that equipment fault brings, described Data Control Center can adopt one main one from the redundancy setting.The other wireless transmitting-receiving equipments of rail is installed one according to the track ambient environmental conditions in a segment distance, distribute along track circuit and come, and the other wireless transmitting-receiving equipments of all described rails is connected to the other data switching exchane of rail by the other network of rail.
The testing result that each described onboard wireless transceiver will detect the other wireless transmitting-receiving equipments signal strength signal intensity of self contiguous rail in real time is sent to described Data Control Center, the wireless transmitting-receiving equipments a pair of combination that signal is the strongest each other was as working equipment by described Data Control Center was selected current time onboard wireless transceiver and rail, and make up with this and to set up the train-ground communication active link, utilize described train-ground communication active link can realize broadband wireless two-way communication between train and the other network of rail.
Along with advancing of train, the change that the position of train can take place, therefore described onboard wireless transmitting-receiving is sent out fully also can be, and the signal coverage areas of constantly passing through the other wireless transmitting-receiving equipments of different rails, when the communication signal strength of original train-ground communication active link during less than a predetermined value, again select the other wireless transmitting-receiving equipments new train-ground communication active link of a pair of conduct that signal is the strongest each other of current time onboard wireless transceiver and rail, treat new train-ground communication active link startup work and when beginning to transmit the communication service of carrying on original train-ground communication active link, close original train-ground communication active link again, the situation of data redundancy can appear in this mode in the Data Receiving side, therefore also need carry out reprocessing to data, so just can realize the seamless quick handover between the other network of train and rail in the Data Receiving side.
Can also being chosen in after described new car ground believes that active link has just connected of the moment that communication is switched, close original train-ground communication active link this moment immediately, and the communication service of carrying on original train-ground communication active link switched on the new car ground letter active link, the situation of data redundancy can not appear in this mode, directly realizes the quick handover of the low time delay between the other network of train and rail.
Data Control Center on the track train is the place, center of handover management, and the reiving/transmitting state of the wireless signal of described onboard wireless transceiver or halted state all are to be controlled by the control command that described Data Control Center sends.When needs communicate switching, when if the wireless transmitting-receiving equipments combination that signal is the strongest each other is more than one group by the current time onboard wireless transceiver received of described Data Control Center and the rail, then picked at random wherein one group make up the train-ground communication link.
Described Data Control Center also can force to set an onboard wireless transceiver and the other wireless transmitting-receiving equipments of rail makes up new train-ground communication active link.
The other wireless transmitting-receiving equipments of described onboard wireless transceiver and the rail judgement of signal strength signal intensity size each other can directly be judged with the amplitude size of signal, also can utilize signal to noise ratio to be used as basis for estimation.
Ultimate range between two other transceivers of adjacent described rail is effective covering radius of the other transceiver wireless signal of single rail.Distance between two other transceivers of adjacent described rail is at a distance of the twice of distance between the onboard wireless transceiver farthest on the train.
In order to prevent from the handoff procedure to occur " ping-pang " phenomenon, the directivity that the present invention travels in conjunction with track train, in described onboard wireless transceiver, be provided with memory, storing the device number of the other wireless transmitting-receiving equipments of described rail in the described memory by the installation site order of the other wireless transmitting-receiving equipments of described rail, described onboard wireless transceiver will shield with the device number of the other wireless receiving unit of the rail of self setting up the train-ground communication active link, carry out train-ground communication active link equipment when combination follow-up, the equipment of conductively-closed will no longer participate in signal relatively, treat that track train travels for single time when finishing, the device number of all conductively-closeds will be restored in the onboard wireless transceiver.When the track train back moved or reruns, all onboard wireless transceivers can normally use again.
The communication protocol of the other wireless transmitting-receiving equipments of described onboard wireless transceiver and described rail all adopts the IEEE802.11g protocol specification.
The present invention compared with the prior art, have following conspicuous outstanding substantive distinguishing features and remarkable advantage: it is clear and definite that the present invention makes full use of in the track traffic current of traffic, characteristics such as the track train length of wagon is long, by a plurality of onboard wireless transceivers are set ON TRAINS, make the portable terminal-train of high-speed mobile become the wireless terminal of a MIMO, and the effective management that realizes train MIMO system is handled in the real time information of passing through Data Control Center, make train when passing through the signal coverage areas of the other wireless transmitting-receiving equipments of a plurality of rails, realized the switching problem of this portable terminal of train and the other wireless transmitting-receiving equipments of rail by the controlled switching of onboard wireless transceiver in the train, no matter train operation is to that position of track, always has a communication link with strong signal strength signal intensity and comes to provide broadband connection for network by train and the rail.The present invention is simple in structure, and deft design can be realized seamless quick switching between the wireless transmitting-receiving equipments by the train of advancing at a high speed and the rail.
Description of drawings:
Fig. 1 is that the car ground detection signal strength under the train initial state situation of a preferred embodiment of the invention changes schematic diagram.
Fig. 2 is that the car ground detection signal strength under the train change bit postpone situation of Fig. 1 example changes schematic diagram.
Fig. 3 be Fig. 1 example train once more the car ground detection signal strength under the change bit postpone situation change schematic diagram.
Embodiment
Details are as follows for a preferred embodiment of the present invention:
Train is an example with Shanghai Underground Line 1 vehicle in the present embodiment, and 23 meters in every joint compartment 6 saves totally, and whole train length is about 140 meters.The other wireless transmitting-receiving equipments of rail adopts WLAN radio reception device AP in the present embodiment, and its communication protocol adopts the 802.11g communication specification, and its useful signal coverage distance in the tunnel is approximately 100 meters.
A kind of WLAN (wireless local area network) trans zone quick switching method that is used for rail communication of the present invention, by the onboard wireless transceiver and the other wireless transmitting-receiving equipments common implementing of the rail that is arranged at track 20 next doors that are arranged on the track train 10, it is characterized in that, be provided with a described onboard wireless transceiver 10A at described track train 10 tailstock, be provided with a described onboard wireless transceiver 10B at described track train 10 headstocks, the distance of the onboard wireless transceiver 10B of the onboard wireless transceiver 10A of the tailstock and headstock is 140 meters of the vehicle commanders of train, the onboard wireless transceiver 10B of the onboard wireless transceiver 10A of the tailstock and headstock is connected to the Data Control Center 12 that is arranged at the tailstock by vehicle-mounted wired ethernet network, the connection cable of described vehicle-mounted wired ethernet network all is provided with the network interface and the middle connecting line of standard in every joint compartment, this is convenient to rebuild vehicle-mounted wired ethernet network when railway car is recombinated.
The other wireless transmitting-receiving equipments of rail distributes along the track circuit straight line and is provided with, distance between the other wireless transmitting-receiving equipments of two adjacent rails is arranged at 200 meters, promptly two the other wireless transmitting-receiving equipments of adjacent rail limit signal overlay areas each other link to each other, and the other wireless transmitting-receiving equipments of all described rails is connected to the other data switching exchane 22 of rail by the other network of rail.
As shown in Figure 1, onboard wireless transceiver 10A detects the other wireless transmitting-receiving equipments 20A of self contiguous rail, 100 parts are signal strength distribution and the related corresponding signal in position of 20A among the figure, distribution onboard wireless transceiver 10B detects the other wireless transmitting-receiving equipments 20B of self contiguous rail, 200 parts are detection signal strength distribution and the related corresponding signal in position of 20B among the figure, 20A and 20B are sent to testing result described Data Control Center 12 simultaneously, described Data Control Center 12 makes up a pair of equipment 10A and the 20A that detection signal is the strongest each other as working equipment, and make up with this and to set up the train-ground communication active link, utilize described train-ground communication active link can realize broadband wireless two-way communication between train and the other network of rail.
Along with advancing of train, the change that the position of train can take place, as shown in Figure 2, the communication signal strength of original 10A and 20A train-ground communication active link is less than predetermined value, described Data Control Center 12 as working equipment, and made up the current time a pair of equipment 10B that detection signal is the strongest each other and 20B combination and set up the train-ground communication active link with this this moment.
Train is further advanced, as shown in Figure 3, and the detection signal strength distribution and related corresponding 300 parts that are illustrated as in position of another rail other wireless transmitting-receiving equipments 20C adjacent with 20B.The communication signal strength of original 10B and 20B train-ground communication active link is less than predetermined value, described Data Control Center 12 as working equipment, and made up the current time a pair of equipment 10A that detection signal is the strongest each other and 20B combination and set up the train-ground communication active link with this this moment.
In like manner following, train is in advancing, along with moving of position, can pass through the other wireless transmitting-receiving equipments of a plurality of rails, the present invention utilizes the controlled switching of the inner onboard wireless transceiver of train to come the ingenious switching problem of having realized this portable terminal of train and the other wireless transmitting-receiving equipments of rail round, no matter train operation is to that position of track, always has a communication link with strong signal strength signal intensity and comes to provide broadband connection for network by train and the rail.
The present invention can be used for providing for track traffic a kind of method of broadband wireless communications link establishment of suitable high-speed mobile, can set up on this basis that a Jian is anti-in track train inside, the integrated application platform of numerous broadband services such as amusement, advertisement, intelligent information are led and taken advantage of, emergency scheduling, broadband access network.
Although described exemplary embodiment of the present invention, in case those skilled in the art understands this basic inventive concept, they can add on the basis of present embodiment and change and modification.Therefore, being intended to appended claim is appreciated that and comprises that above embodiment and all drop on this variation and the modification within these spirit and scope.
The present invention is not limited to subway, railway, and track traffic applications such as light rail, the related application in all the present invention wireless communications application applicatory field all should be known the row that comprised by in the present invention.
Claims (10)
1. WLAN (wireless local area network) trans zone quick switching method that is used for rail communication, set up train-ground communication by being arranged at the onboard wireless transceiver on the track train and being arranged between the other wireless transmitting-receiving equipments of rail on track next door, it is characterized in that: described track train is provided with at least two described onboard wireless transceivers, the other wireless transmitting-receiving equipments of described rail distributes along track circuit and is provided with, described onboard wireless transceiver detects the signal strength signal intensity of the other wireless transmitting-receiving equipments of contiguous rail in real time, the other wireless transmitting-receiving equipments of onboard wireless transceiver and rail is set up the train-ground communication active link between the strongest a pair of of signal each other and is carried out train-ground communication, when the communication signal strength of train-ground communication active link during less than predetermined value, again select the other wireless transmitting-receiving equipments new train-ground communication active link of a pair of conduct that signal is the strongest each other of current time onboard wireless transceiver and rail, treat new train-ground communication active link startup work and when beginning to transmit the communication service of carrying on original train-ground communication active link, close original train-ground communication active link again; The headstock top of described track train is provided with a described onboard wireless transceiver, and the vehicle tail end of described track train is provided with a described onboard wireless transceiver.
2. the WLAN (wireless local area network) trans zone quick switching method that is used for rail communication as claimed in claim 1, it is characterized in that: a data control centre is set ON TRAINS, all described onboard wireless transceivers are connected to described Data Control Center by communication network on the track train, the testing result that described onboard wireless transceiver will detect the other wireless transmitting-receiving equipments signal strength signal intensity of contiguous rail in real time is sent to described Data Control Center, and described Data Control Center is selected onboard wireless transceiver and the other wireless transmitting-receiving equipments of rail that is used to set up described train-ground communication active link by numeric ratio.
3. the WLAN (wireless local area network) trans zone quick switching method that is used for rail communication as claimed in claim 2 is characterized in that: described Data Control Center forces to set an onboard wireless transceiver and the other wireless transmitting-receiving equipments of rail makes up new train-ground communication active link.
4. the WLAN (wireless local area network) trans zone quick switching method that is used for rail communication as claimed in claim 2, it is characterized in that: the other wireless transmitting-receiving equipments combination that signal is the strongest each other of the current onboard wireless transceiver that described Data Control Center is received and rail is during more than one group, then picked at random wherein one group make up the train-ground communication link.
5. the WLAN (wireless local area network) trans zone quick switching method that is used for rail communication as claimed in claim 1 is characterized in that: the other wireless transmitting-receiving equipments of all described rails is connected to the other data switching exchane of rail by the other network of rail.
6. the WLAN (wireless local area network) trans zone quick switching method that is used for rail communication as claimed in claim 1 is characterized in that: the ultimate range between two other transceivers of adjacent described rail is effective covering radius of the other transceiver wireless signal of single rail.
7. the WLAN (wireless local area network) trans zone quick switching method that is used for rail communication as claimed in claim 1 is characterized in that two distances between the other transceiver of adjacent described rails are at a distance of the twice of the distance between the onboard wireless transceiver farthest on the train.
8. the WLAN (wireless local area network) trans zone quick switching method that is used for rail communication as claimed in claim 1 is characterized in that: described onboard wireless transceiver is by detecting and the noise of the other wireless transmitting-receiving equipments of rail demarcation signal intensity recently.
9. the WLAN (wireless local area network) trans zone quick switching method that is used for rail communication as claimed in claim 1, it is characterized in that: be provided with memory in the described onboard wireless transceiver, storing the device number of the other wireless transmitting-receiving equipments of described rail in the described memory by the installation site order of the other wireless transmitting-receiving equipments of described rail, described onboard wireless transceiver will shield with the device number of the other wireless receiving unit of the rail of self setting up the train-ground communication active link, carry out train-ground communication active link equipment when combination follow-up, the equipment of conductively-closed will no longer participate in signal relatively, treat that track train travels for single time when finishing, the device number of all conductively-closeds will be restored in the onboard wireless transceiver.
10. the WLAN (wireless local area network) trans zone quick switching method that is used for rail communication as claimed in claim 1 is characterized in that: the communication protocol of the other wireless transmitting-receiving equipments of described onboard wireless transceiver and described rail all adopts the IEEE802.11g protocol specification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610029233A CN100579276C (en) | 2006-07-21 | 2006-07-21 | Trans zone quick switching method for rail communication radio local area network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200610029233A CN100579276C (en) | 2006-07-21 | 2006-07-21 | Trans zone quick switching method for rail communication radio local area network |
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| CN1946228A CN1946228A (en) | 2007-04-11 |
| CN100579276C true CN100579276C (en) | 2010-01-06 |
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| CN200610029233A Expired - Fee Related CN100579276C (en) | 2006-07-21 | 2006-07-21 | Trans zone quick switching method for rail communication radio local area network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US20210246004A1 (en) * | 2018-04-23 | 2021-08-12 | Kabushiki Kaisha Toyota Jidoshokki | Industrial vehicle remote operation system, industrial vehicle, computer-readable storage medium storing industrial vehicle remote operation program, and industrial vehicle remote operation method |
| EP4277352A1 (en) * | 2022-05-09 | 2023-11-15 | HAN Networks Co., Ltd. | Wireless fast roaming system and method |
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| CN101604982B (en) * | 2008-06-12 | 2013-02-27 | 上海寰创通信科技股份有限公司 | Sense switchover method under co-frequency coverage |
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| CN101888679B (en) * | 2010-05-31 | 2012-08-22 | 西南交通大学 | Multi-vehicle mounted station cooperation cell switching method for train-ground communication under high-speed moving environment |
| CN102324958A (en) * | 2011-09-15 | 2012-01-18 | 上海大学 | Wireless communication method used for MIMO (multiple input multiple output) system under high-speed railway environment |
| CN103067995B (en) * | 2011-10-21 | 2015-07-08 | 中国电信股份有限公司 | Access handoff method and system and mobile access device |
| CN103731890A (en) * | 2013-12-11 | 2014-04-16 | 福建星网锐捷网络有限公司 | Link switching method under high-speed motion state, vehicle-mounted AP and system |
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| CN107820285B (en) * | 2016-09-14 | 2020-06-30 | 卡斯柯信号有限公司 | Wireless channel active control method |
| CN107628065A (en) * | 2017-10-24 | 2018-01-26 | 北京艾恩斯网络科技有限公司 | Train communication system |
| CN107613539A (en) * | 2017-10-24 | 2018-01-19 | 北京艾恩斯网络科技有限公司 | Vehicle-ground wireless communication system |
| CN108289313B (en) * | 2017-12-04 | 2020-09-25 | 天津津航计算技术研究所 | Vehicle-mounted wireless design method compatible with WLAN and LTE |
| CN111918242B (en) * | 2020-08-12 | 2024-04-16 | 南方银谷科技有限公司 | Wireless communication device for train and ground and method for realizing high-bandwidth communication |
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2006
- 2006-07-21 CN CN200610029233A patent/CN100579276C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US20210246004A1 (en) * | 2018-04-23 | 2021-08-12 | Kabushiki Kaisha Toyota Jidoshokki | Industrial vehicle remote operation system, industrial vehicle, computer-readable storage medium storing industrial vehicle remote operation program, and industrial vehicle remote operation method |
| EP4277352A1 (en) * | 2022-05-09 | 2023-11-15 | HAN Networks Co., Ltd. | Wireless fast roaming system and method |
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| CN1946228A (en) | 2007-04-11 |
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