CN101934804A - Switch method of vehicle-ground wireless communication of urban railway transport system - Google Patents
Switch method of vehicle-ground wireless communication of urban railway transport system Download PDFInfo
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Abstract
The invention relates to a switch method of vehicle-ground wireless communication of a urban railway transport system, comprising the steps that: S1, when a train reaches a preset switch point, a first vehicle mounted wireless device sends a switch request frame to a railway-side wireless device of the switch point, the railway-side wireless device receives the switch request frame and sends a response frame to the first vehicle mounted wireless device, and the first vehicle mounted wireless device starts a switch process; and S2, after a preset waiting time, a second vehicle mounted wireless device sends a switch request frame to the railway-side wireless device of the switch point, the railway-side wireless device receives the switch request frame and sends a response frame to the second vehicle mounted wireless device, and the second vehicle mounted wireless device starts a switch process. In the method, the train switches at a preset switch point, and the head and tail of the train respectively switch at different times, thereby avoiding communication interruption and data loss in the simultaneous switch of the train head and the train tail.
Description
Technical field
The present invention relates to technical field of data transmission, relate in particular to a kind of changing method of City Rail Transit System vehicle-ground wireless communication.
Background technology
Train control system (Communication Based Train Control at City Rail Transit System based on communication, CBTC) land mobile communication system adopts the frequency range of 2.4GHz to carry out data transmission usually, and wherein a large portion adopts wireless local area network technology.
The land mobile communication system data packets for transmission of CBTC is drawn together the train position information that train sends earthward, and ground is to the Train Control information of train transmission.These information are data very high to security requirement, and are therefore, very high to the reliability requirement of train-ground communication.In IEEE 1474.1 (2004) standards, the time-delay that the regulation train-ground communication is communicated by letter with the ground car can not surpass 0.5～2 second, otherwise train will emergency braking.Simultaneously, the packet loss of train-ground communication and HO-break duration also are the important indicators that influences the train-ground communication quality.On-the-spot test is the result show, (Access Point, AP) HO-break duration between is the most key factor that influences CBTC train-ground communication reliability to train at different access points.
The other wireless device AP of the rail of CBTC system usually with smaller distance as 200～300 meters interval along orbital arrangement, the overlay area of AP only is this scope of 100 meters.The antenna of the other AP of rail adopts directional antenna usually, can send or obtain stronger energy like this on certain direction, thereby enlarges the coverage of AP, and the coverage mode of employing directional antenna as shown in Figure 1.
In order to guarantee the reliability of train-ground communication, in the CBTC of reality system, can adopt the structure of double-network redundant usually, as shown in Figure 2.Wherein, wired backbone network adopts ring-like pair of web frame, and the advantage that adopts ring type structure is when an access path at station and station interrupts, and above-mentioned station can also keep connecting by another paths, does not influence the normal operation of system.Adopt the double-network redundant structure, when a network et out of order, still can pass through another network delivery car ground information, do not influence the normal operation of system.
Wireless network adopts the single covered structure of two nets, and in each equipment box along the line two wireless transmitting-receiving equipments being installed simultaneously is AP, is connected with the exchange of dotted line net with the solid line net respectively by optical fiber.The head of train and afterbody install the vehicle-mounted wireless device of two covers (be generally wireless workgroup bridge, (Work Group Bridge, WGB)), two WGB use different frequencies, are respectively applied for the data that receive dotted line net and solid line net.When the terrestrial wireless equipment (AP) of single network or in-vehicle wireless device (WGB) et out of order, system still can be by the terrestrial wireless equipment (AP) and in-vehicle wireless device (WGB) transmitting and receiving data of another network.
Its dotted line net and solid line net are isolated physically fully in the two web frames of redundancy described above, thereby the fault of a network does not influence the normal operation of another network fully.
Existing land mobile communication system great majority adopt the wireless local area network technology of 2.4GHz, and train need carry out frequent switching between different AP, be made up of scanning process, authentication process and series of fortified passes connection process according to its handoff procedure of agreement.Wherein, scanning process need scan in turn to a channel surplus the WLAN employed ten usually, therefore the time that needs is long, the longest can arriving more than 1 second, because WLAN devices is a half-duplex apparatus, normal data transmit-receive can interrupt in the process of switching, and influences traffic safety, also just can't satisfy the requirement of CBTC train-ground communication, switching problem has become to influence one of key factor of CBTC train-ground communication performance.There is the result to show that handover delay is to influence based on the most key factor of the CBTC land mobile communication system of WLAN, switches the packet loss sum that causes and will be far longer than the number of dropped packets that the normal wireless transmission causes
The condition that common triggering onboard wireless LAN equipment switches is that its radio signal quality that receives is lower than a certain specific thresholding.The decline value of wireless signal is a change variable, and therefore, when the headstock of train or the tailstock initiate to switch also is ccasual.The situation that so just may cause the headstock and the tailstock to switch simultaneously takes place, and can cause the train-ground communication of the headstock and the tailstock to be in simultaneously in the handoff process like this, because the time of handoff is long, can influence the performance of CBTC train-ground communication greatly.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is: how to avoid headstock wireless device and tailstock wireless device to switch simultaneously, and cause losing of communication data thus.
(2) technical scheme
For addressing the above problem, the invention provides a kind of changing method of City Rail Transit System vehicle-ground wireless communication, the method comprising the steps of:
S1. train arrives when setting switching point, first in-vehicle wireless device sends handover request frame to the other wireless device of the rail of switching point, respond response frame to first in-vehicle wireless device after the other wireless device of described rail receives described handover request frame, first in-vehicle wireless device begins to switch to from the other wireless device of current rail the process of the other wireless device of target rail;
S2. through behind the predetermined wait time, second in-vehicle wireless device sends handover request frame to the other wireless device of the rail of described switching point, respond response frame to second in-vehicle wireless device after the other wireless device of described rail receives described handover request frame, second in-vehicle wireless device begins to switch to from the other wireless device of current rail the process of the other wireless device of target rail.
Wherein, comprise also before the step S1 whether the position of train judgement oneself arrives the step of switching point.
Wherein, train judges that whether the position of oneself arrives switching point is to realize by global positioning system.
Wherein, train judges that whether own position arrives switching point is by one or more the combination realization in tachogenerator, responser, the Doppler radar.
Wherein, described first in-vehicle wireless device is arranged at headstock, and described second in-vehicle wireless device is arranged at the tailstock, and the two uses nonoverlapping frequency.
Wherein, described predetermined wait time needed time of handoff procedure of being not less than described first in-vehicle wireless device.
(3) beneficial effect
In the City Rail Transit System train-ground communication changing method of the present invention, train switches at the switching point that pre-sets, and headstock switches in the different time respectively with the tailstock, and the communication disruption in the time of can avoiding the headstock and the tailstock to switch simultaneously and the phenomenon of loss of data take place.
Description of drawings
Fig. 1 is the double-network redundant structural representation of CBTC land mobile communication system;
Fig. 2 is a City Rail Transit System train-ground communication environment scheme drawing;
Fig. 3 is the changing method diagram of circuit according to the City Rail Transit System vehicle-ground wireless communication of one embodiment of the present invention.
The specific embodiment
For the combination proposed by the invention position fixing system state self checking method that tests the speed, describe in detail in conjunction with the accompanying drawings and embodiments.
Further specify method of the present invention by detailed embodiment, be applied in the vehicle-ground wireless communication of City Rail Transit System, in this vehicle-ground wireless communication system, two independently onboard wireless transceivers are arranged on the train, these two wireless transmitting-receiving equipments place the headstock and the tailstock respectively, be headstock wireless device and tailstock wireless device, the two uses nonoverlapping frequency f1, f2, and it is corresponding with the frequency of onboard wireless transceiver, at the other other wireless transmitting-receiving equipments of the rail consistent with the in-vehicle wireless device frequency that is furnished with of rail, the onboard wireless transceiver communicates with the wireless transmitting-receiving equipments of the other corresponding frequency of rail on frequency separately respectively.The data message content that the other wireless transmitting-receiving equipments of rail on the different frequent points sends to in-vehicle wireless device is identical, it is also identical that in-vehicle wireless device on the different frequent points sends to the data message content of the other wireless transmitting-receiving equipments of rail, after the onboard wireless transceiver received data message, onboard control device only selected wherein a kind of correct information to handle.
As shown in Figure 2, train orbits, and AP is arranged in by the rail, carries out the beidirectional data communication with train, connects by exchange between the AP.Because the coverage of the other AP of rail only is the zone that covers train mobile station place on the rail, transfer sequence is fixed between the AP of the land mobile communication system of urban track traffic.If the AP mode of operation is normal, the purpose AP that mobile station switches to certain ad-hoc location at every turn is a unmodified, so its changing method can simplify, and makes train arrive specific switching point at every turn and just initiates to switch.What suppose that the headstock wireless device of train inserts is the dotted line net, and what tailstock wireless device inserted is the solid line net, and dotted line net and solid line net are fully from physically isolating.
As shown in Figure 3, the changing method according to one embodiment of the present invention comprises the steps:
S1. train judges whether oneself has arrived switching position, if arrived switching position, then first in-vehicle wireless device is that headstock wireless device (supposing to use frequency f1) sends the relevant claim frame of switching to the other wireless device of the rail of switching point, and request begins to switch.And the other wireless device of the rail that receives claim frame is responded a response frame to the headstock wireless device, and the headstock wireless device begins to switch to from the other wireless device of current rail the process of the other wireless device of target rail.
Wherein, train judges whether the position of oneself arrives the switching position point and can pass through global positioning system, and the combination that also can pass through one or more speed measuring devices in the speed measuring devices such as tachogenerator, responser, Doppler radar realizes.
Train is not that the power of the signal quality that receives according to in-vehicle wireless device is lower than a certain thresholding and initiates to switch, but when pre-set switching point is arrived in train operation, the headstock wireless device initiates to switch, and switches to the other wireless device of another rail from the other wireless device of a rail.By initiating to switch at fixing switching point, when train initiates to switch can be controlled, and the time point of switching is a random variation no longer just.
S2. through one section pre-set wait time T
HOAfter, second in-vehicle wireless device is that tailstock wireless device (supposing to use frequency f2) sends the relevant claim frame of switching to the other wireless device of the rail of same switching point, the beginning handoff procedure switches to the other wireless device of target rail from the other wireless device of current rail.Here require T
HOBe not less than the time that the headstock handoff procedure needs, that is to say and be not less than HO-break duration, so just can avoid the headstock wireless device when switching, the tailstock does not switch, thereby communication disruption and loss of data when avoiding the headstock and the tailstock to switch simultaneously are set to the hundreds of millisecond usually and get final product.
The other wireless device of switching point position and target rail is pre-determining, is arranged in the control convenience of train.In the middle of two AP, its setting is only relevant with the position usually for switching point.Because track may turn round, therefore, the middle that is arranged on two AP is that it is provided with one of the position preferably embodiment, and the concrete setting of switching point should be by concrete engineering site location survey decision.
Above embodiment only is used to illustrate the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make various variations and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (6)
1. the changing method of a City Rail Transit System vehicle-ground wireless communication is characterized in that, the method comprising the steps of:
S1. train arrives when setting switching point, first in-vehicle wireless device sends handover request frame to the other wireless device of the rail of switching point, respond response frame to first in-vehicle wireless device after the other wireless device of described rail receives described handover request frame, first in-vehicle wireless device begins to switch to from the other wireless device of current rail the process of the other wireless device of target rail;
S2. through behind the predetermined wait time, second in-vehicle wireless device sends handover request frame to the other wireless device of the rail of described switching point, respond response frame to second in-vehicle wireless device after the other wireless device of described rail receives described handover request frame, second in-vehicle wireless device begins to switch to from the other wireless device of current rail the process of the other wireless device of target rail.
2. the changing method of City Rail Transit System vehicle-ground wireless communication as claimed in claim 1 is characterized in that, comprises also before the step S1 whether the position of train judgement oneself arrives the step of switching point.
3. the changing method of City Rail Transit System vehicle-ground wireless communication as claimed in claim 2 is characterized in that, train judges that whether the position of oneself arrives switching point is to realize by global positioning system.
4. the changing method of City Rail Transit System vehicle-ground wireless communication as claimed in claim 2, it is characterized in that train judges that whether own position arrives switching point is by one or more the combination realization in tachogenerator, responser, the Doppler radar.
5. the changing method of City Rail Transit System vehicle-ground wireless communication as claimed in claim 1 is characterized in that, described first in-vehicle wireless device is arranged at headstock, and described second in-vehicle wireless device is arranged at the tailstock, and the two uses nonoverlapping frequency.
6. as the changing method of each described City Rail Transit System vehicle-ground wireless communication of claim 1-5, it is characterized in that the needed time of handoff procedure that described predetermined wait time is not less than described first in-vehicle wireless device.
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| CN102281547A (en) * | 2011-08-03 | 2011-12-14 | 京信通信***（中国）有限公司 | Node coverage combined device and energy-saving and noise-reducing communication coverage system |
| CN102497655A (en) * | 2011-12-13 | 2012-06-13 | 南京恩瑞特实业有限公司 | Dual network card cooperative handover method based on train position |
| 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) |
| CN103661496A (en) * | 2012-09-13 | 2014-03-26 | 北京南车时代信息技术有限公司 | Train tracking method and system, station ATS server and station ATS |
| CN103763679A (en) * | 2013-12-31 | 2014-04-30 | 北京交通大学 | Track traffic operation control and train-ground wireless communication integrated system and method |
| CN105916754A (en) * | 2014-02-28 | 2016-08-31 | 西门子公司 | Method and arrangement for operating radio-influenced rail-bound vehicles |
| CN105933917A (en) * | 2016-06-30 | 2016-09-07 | 上海长合信息技术股份有限公司 | Vehicle-ground wireless communication trackside base station of subway and communication method |
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| CN109649449A (en) * | 2018-12-26 | 2019-04-19 | 交控科技股份有限公司 | The Arrangement of responder method of vehicle-mounted ATP and the not parking automatic switchover of LKJ control |
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| CN110913418A (en) * | 2019-11-27 | 2020-03-24 | 武汉烽合智达信息技术有限责任公司 | Method and system for early warning and positioning of rail transit communication fault |
| CN111479212A (en) * | 2019-01-23 | 2020-07-31 | 成都鼎桥通信技术有限公司 | Cell switching method and device |
| CN111836365A (en) * | 2019-04-15 | 2020-10-27 | 中铁二院工程集团有限责任公司 | Communication system based on high-speed urban rail |
| CN112977552A (en) * | 2021-03-02 | 2021-06-18 | 卡斯柯信号有限公司 | Automatic vehicle head switching judgment method and device based on route map equivalent direction |
| CN113079549A (en) * | 2020-01-03 | 2021-07-06 | 普天信息技术有限公司 | Cell switching method and device |
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| 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) |
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| CN102281547B (en) * | 2011-08-03 | 2014-05-14 | 京信通信***（中国）有限公司 | Node coverage combined device and energy-saving and noise-reducing communication coverage system |
| CN102497655B (en) * | 2011-12-13 | 2014-07-30 | 南京恩瑞特实业有限公司 | Dual network card cooperative handover method based on train position |
| CN102497655A (en) * | 2011-12-13 | 2012-06-13 | 南京恩瑞特实业有限公司 | Dual network card cooperative handover method based on train position |
| CN103661496A (en) * | 2012-09-13 | 2014-03-26 | 北京南车时代信息技术有限公司 | Train tracking method and system, station ATS server and station ATS |
| CN103661496B (en) * | 2012-09-13 | 2016-08-03 | 北京南车时代信息技术有限公司 | Train tracing method and system, station ATS server and station ATS |
| CN103763679A (en) * | 2013-12-31 | 2014-04-30 | 北京交通大学 | Track traffic operation control and train-ground wireless communication integrated system and method |
| CN105916754A (en) * | 2014-02-28 | 2016-08-31 | 西门子公司 | Method and arrangement for operating radio-influenced rail-bound vehicles |
| CN105933917A (en) * | 2016-06-30 | 2016-09-07 | 上海长合信息技术股份有限公司 | Vehicle-ground wireless communication trackside base station of subway and communication method |
| CN107846716B (en) * | 2016-09-20 | 2020-10-20 | 卡斯柯信号有限公司 | Method for optimizing high-speed wifi transmission performance of rail transit signal system |
| CN107846716A (en) * | 2016-09-20 | 2018-03-27 | 卡斯柯信号有限公司 | A kind of method for optimizing rail traffic signal system high speed wifi transmission performances |
| CN108616921A (en) * | 2016-12-13 | 2018-10-02 | 普天信息技术有限公司 | A kind of train communication control method and device |
| CN107628065A (en) * | 2017-10-24 | 2018-01-26 | 北京艾恩斯网络科技有限公司 | Train communication system |
| CN107613455A (en) * | 2017-10-24 | 2018-01-19 | 北京艾恩斯网络科技有限公司 | Rail vehicle earth communication system |
| CN110740482A (en) * | 2018-07-20 | 2020-01-31 | 比亚迪股份有限公司 | Area switching method and device, train access unit and train |
| CN110740482B (en) * | 2018-07-20 | 2021-09-03 | 比亚迪股份有限公司 | Area switching method and device, train access unit and train |
| CN109649449A (en) * | 2018-12-26 | 2019-04-19 | 交控科技股份有限公司 | The Arrangement of responder method of vehicle-mounted ATP and the not parking automatic switchover of LKJ control |
| CN111479212A (en) * | 2019-01-23 | 2020-07-31 | 成都鼎桥通信技术有限公司 | Cell switching method and device |
| CN111479212B (en) * | 2019-01-23 | 2022-08-09 | 成都鼎桥通信技术有限公司 | Cell switching method and device |
| CN111836365A (en) * | 2019-04-15 | 2020-10-27 | 中铁二院工程集团有限责任公司 | Communication system based on high-speed urban rail |
| CN110913418A (en) * | 2019-11-27 | 2020-03-24 | 武汉烽合智达信息技术有限责任公司 | Method and system for early warning and positioning of rail transit communication fault |
| CN113079549A (en) * | 2020-01-03 | 2021-07-06 | 普天信息技术有限公司 | Cell switching method and device |
| CN112977552A (en) * | 2021-03-02 | 2021-06-18 | 卡斯柯信号有限公司 | Automatic vehicle head switching judgment method and device based on route map equivalent direction |
| CN112977552B (en) * | 2021-03-02 | 2022-07-15 | 卡斯柯信号有限公司 | Automatic vehicle head switching judgment method and device based on route map equivalent direction |
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