CN102811415B - Train-ground communication method of urban railway transportation - Google Patents
Train-ground communication method of urban railway transportation Download PDFInfo
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- CN102811415B CN102811415B CN201210247833.9A CN201210247833A CN102811415B CN 102811415 B CN102811415 B CN 102811415B CN 201210247833 A CN201210247833 A CN 201210247833A CN 102811415 B CN102811415 B CN 102811415B
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Abstract
The invention discloses a train-ground communication method of urban railway transportation, which belongs to the technical field of railway transportation communication and is used for solving the wireless link interference of the existing train-ground communication method. The method comprises the following steps of: setting a fixed IP (Internet Protocol) address for each wireless access point AP main engine; pre-storing an IP address list of the wireless access point AP main engine in a vehicle-mounted wireless controller; connecting the wireless access point AP main engine to train control information sent by a ground controller and adding the self IP address into the train control information; receiving the train control information by the vehicle-mounted wireless controller and determining that the train control information is information sent to the vehicle-mounted wireless controller and finding out the IP address of the wireless access point AP main engine and an IP address of the next wireless access point AP main engine from the IP address list of the wireless access point AP main engine; and respectively singly playing vehicle-mounted information to the two IP addresses. According to the train-ground communication method of the urban railway transportation disclosed by the invention, the interferences when data is sent to a ground surface by a train are reduced and a train-ground communication performance of a system is improved.
Description
Technical field
The invention belongs to track traffic communication technical field, relate in particular to a kind of train-ground communication method of urban track traffic.
Background technology
Along with particularly radiotechnics develop rapidly of the communication technology, people begin one's study and take the communication technology as basic train operation control system CBTC(Communication Based Train Control System).CBTC system utilizes radio communication to transmit reliably, in real time car-ground two-way large capacity information, train in running by wireless in real time earthward center send self state informations such as position, speed.Center, ground sends to train by wireless by information such as the place ahead barrier, temporary speed limitations.Train, according to real-time computational speed curves of information such as the place ahead obstacle information, Train Parameters, line parameter circuit values, is controlled train and is moved under safe speed.
The feature of CBTC system is by wireless communication media, to realize the two-way communication of train and ground installation, in order to replace track circuit to realize train operation as media, controls.The outstanding advantages of CBTC is the two-way communication that can realize between car-ground, and transmission information amount is large, transmission speed is fast, be easy to realize moving automatic block system, the interval cabling of a large amount of minimizing, reduces one-time investment and reduces line service, can increase substantially carrying capacity of the block section, organize flexibly way traffic and unidirectionally dispatch a car continuously, the train operation that easily adapts to the different speed of a motor vehicle, different freight volume, dissimilar traction is controlled etc.In CBTC system, not only can realize train operation and control, and can realize integrated operation management.Because, two-way radio communications system both can have the transmission of security classes information bidirectional, also can the non-security category information of transmitted in both directions, such as a large amount of locomotives of running number, crew class group number, vehicle number, running time-division, locomotive state, oil consumption parameter etc., work business, electricity business etc. for information about.Utilize CBTC both can realize fixed autoblock systems, also can realize moving automatic block system.
The security classes communication of the land mobile communication system transmission of CBTC comprises the train position information that train sends earthward, and the Train Control information that sends to train of ground etc.These information are data very high to security requirement, therefore, very high to the reliability requirement of train-ground communication.At IEEE 1474.1(2004) in standard, the time delay that regulation train-ground communication and ground car are communicated by letter can not be over 0.5 ~ 2 second, otherwise train will brake hard.Meanwhile, the packet loss of train-ground communication and HO-break duration are also the important indicators that affects train-ground communication quality.
A kind of conventional CBTC data communication system structure as shown in Figure 1, referring to patent application " train control system " (application number: 200810211077.8).Realizing in the middle of the communication network that train operation controls, train orbits, and the onboard wireless controller on car and the wireless access point AP on ground (Access Point) exchange train position information and Train Control information by the mode of radio communication.
Wherein the online positional information of the train of ground controller based on from onboard system, generates and issues the Train Control message (parking spot information etc.) of onboard system, and send to each wireless access point AP main process equipment.The treatment cycle of wireless access point AP is conventionally different from the cycle of ground controller, wireless access point AP main frame is realized ground controller and is synchronizeed and Data Format Transform with the data transmit-receive between wireless access point AP, its function is the information that receives all wireless access point AP in administrative area, according to certain form component frame, and send to ground controller with certain cycle.The information that same wireless access point AP main frame sends ground controller sends to wireless access point AP all in administrative area every certain cycle, and wireless access point AP sends to onboard wireless controller by wireless link again.Between different wireless access point AP main frames, normally independently, there is not direct annexation.
The onboard wireless controller that train position information exchange on train is crossed on car sends on wireless link, the wireless access point AP that is arranged on trackside receives this information, and this information exchange is crossed to optical fiber and switch is delivered to wireless access point AP main frame, wireless access point AP main frame again this information exchange is crossed to wired network and switch sends to ground controller.And the Train Control information exchange that ground controller produces crosses switch and cable network first sends to wireless access point AP main frame, wireless access point AP main frame is transmitted to a plurality of wireless access point AP that are connected on switch by switch, wireless access point AP sends to the onboard wireless controller on car by wireless link by information.
When carrying out data communication, the IP address of transmitting terminal and receiving terminal need to be set.Because the train quantity of moving on subway and light railways is more, therefore ground controller is when sending Train Control information to train, first send to each wireless access point AP main frame, wireless access point AP main frame adopts broadcast mode the Train Control information exchange receiving to be crossed to each wireless access point AP and the train that broadcasts to its jurisdiction conventionally, transmitting terminal address is now set to the IP address of wireless access point AP main frame, and receiver address is 255.255.255.255, be set to broadcast transmission.All trains of operation can receive the Train Control information that ground sends on the line, the train ID of the collection information by reading of the wireless controller on train or other sign judge whether it is the control information that sends to oneself, thereby carry out further information processing.
And train is when move on the line, need to carry out associatedly with a wireless access point AP of trackside, wireless access point AP is under the jurisdiction of again one of them wireless access point AP main frame.When the onboard wireless controller on train will send data to ground controller, must first by wireless access point AP main frame, forward, this is because the interval that onboard wireless controller sends data by wireless link is conventionally conventionally less, for a few tens of milliseconds, data packet length is also smaller, is tens bytes.Wireless access point AP main frame can receive the train position information that all wireless access point AP coupled in a communication cycle (being generally hundreds of millisecond) receive, and is formed a packet that length is larger, and sends to ground controller.And train is when move on the line, need often to switch wireless access point AP and the wireless access point AP main frame associated with it, conventionally and do not known oneself to arrive the compass of competency of which wireless access point AP main frame, do not know the IP address of wireless access point AP main frame yet, therefore when sending packet to wireless access point AP main frame, can only send with broadcast mode, receiver address is set to broadcast address 255.255.255.255.
Onboard wireless controller sends data with broadcast mode to wireless access point AP and has certain problem.As shown in Figure 2, first the packet that onboard wireless controller 2 sends sends to the wireless access point AP 1 of ground trackside by wireless link, and wireless access point AP 1 sends to wireless access point AP main frame by data by cable network.But, wireless access point AP main frame links together by all wireless access point AP of the network switch and its administration, therefore when wireless access point AP main frame receives after the broadcast data packet of train transmission, by packet broadcast transmission to all of the port on switch, that is to say that packet meeting broadcast transmission is to all wireless access point AP that are connected to switch, as the wireless access point AP 2 in figure ..., wireless access point AP n, and send to the onboard wireless controller associated with wireless access point AP by these wireless access point AP.
Process from the above description can be found out, when onboard wireless controller carries out broadcast transmission data to wireless access point AP main frame, data not only send to wireless access point AP main frame, also can send to wireless access point AP main frame and be connected to all wireless access point AP on same switch, and finally send to all onboard wireless controllers associated with wireless access point AP.Because wireless access point AP is connected by wireless mode with onboard wireless controller, will certainly cause like this wireless transmission between train and ground to disturb increase, affect the performance of train-ground communication.
Therefore, need to propose a kind of train-ground communication mechanism of urban track traffic, while avoiding train and ground communication, occur too many broadcast data packet, reduce the interference of wireless link.
Summary of the invention
The object of the invention is, a kind of train-ground communication method of urban track traffic is provided, the wireless link interference problem too much causing in order to solve the broadcast data packet of current train-ground communication method existence.
To achieve these goals, the technical solution used in the present invention is that a kind of train-ground communication method of urban track traffic, is characterized in that described method comprises:
Step 1: for each wireless access point AP main frame arranges fixed ip address;
Step 2: in onboard wireless controller, the list of pre-stored wireless access point AP host IP address;
Step 3: ground controller sends Train Control information to wireless access point AP main frame;
Step 4: wireless access point AP main frame is received after Train Control information, joins the IP address of self in Train Control information;
Step 5: wireless access point AP main frame sends to Train Control information by the mode of broadcast the wireless access point AP being connected with described wireless access point AP main frame, then Train Control information is sent to the onboard wireless controller of train by described wireless access point AP;
Step 6: the onboard wireless controller of train is received after Train Control information, according to the train ID in Train Control information, judge whether described Train Control information is the Train Control information that sends to train self, if described Train Control information is the Train Control information that sends to train self, perform step 7; Otherwise, abandon this Train Control information and perform step 10;
Step 7: onboard wireless controller extracts the IP address of wireless access point AP main frame from Train Control information then finds out the IP address of wireless access point AP main frame and the IP address of next wireless access point AP main frame from the list of wireless access point AP host IP address;
Step 8: onboard wireless controller sends on-vehicle information in the mode of clean culture to the IP address of wireless access point AP main frame, then to the IP address of next wireless access point AP main frame, send on-vehicle information with mode of unicast.
Step 9: wireless access point AP main frame sends to ground controller by on-vehicle information;
Step 10: finish.
The list of described wireless access point AP host IP address comprises following field: the IP address of wireless access point AP host id numbering, wireless access point AP position of host machine coding and wireless access point AP main frame.
The present invention adopts broadcast mechanism when ground controller and onboard wireless controller communicate, and onboard wireless controller and ground controller are when communicate, the AP main frame of communicating by letter is carried out to clean culture transmission with the next AP main frame that will communicate by letter, thereby effectively reduced interference when train sends data to ground, improved the performance of system train-ground communication.
Accompanying drawing explanation
Fig. 1 is conventional CBTC data communication system schematic diagram;
Fig. 2 is that onboard wireless controller sends schematic diagram to wireless access point AP host broadcast;
Fig. 3 is the train-ground communication method flow diagram of urban track traffic;
Fig. 4 is the list of wireless access point AP host IP address.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that, following explanation is only exemplary, rather than in order to limit the scope of the invention and to apply.
Fig. 3 is the train-ground communication method flow diagram of urban track traffic.As shown in Figure 3, the train-ground communication method of urban track traffic comprises:
Step 1: for each wireless access point AP main frame arranges fixed ip address.
Step 2: in onboard wireless controller, the list of pre-stored wireless access point AP host IP address.
Fig. 4 is the list of wireless access point AP host IP address, and the list of wireless access point AP host IP address comprises following field: the IP address of wireless access point AP host id numbering, wireless access point AP position of host machine coding and wireless access point AP main frame.
Step 3: ground controller sends Train Control information to wireless access point AP main frame.
Step 4: wireless access point AP main frame is received after Train Control information, joins the IP address of self in Train Control information.
Step 5: wireless access point AP main frame sends to Train Control information by the mode of broadcast the wireless access point AP being connected with described wireless access point AP main frame, then Train Control information is sent to the onboard wireless controller of train by described wireless access point AP.
Step 6: the onboard wireless controller of train is received after Train Control information, according to the train ID in Train Control information, judge whether described Train Control information is the Train Control information that sends to train self, if described Train Control information is the Train Control information that sends to train self, perform step 7; Otherwise, abandon this Train Control information and perform step 10.
Step 7: onboard wireless controller extracts the IP address of wireless access point AP main frame from Train Control information then finds out the IP address of wireless access point AP main frame and the IP address of next wireless access point AP main frame from the list of wireless access point AP host IP address.
In the list of wireless access point AP host IP address, by wireless access point AP position of host machine, encode, can find the next wireless access point AP main frame of wireless access point AP main frame, it is next wireless access point AP main frame adjacent with this wireless access point AP main frame on track, and then by the list of wireless access point AP host IP address, can find the IP address of next wireless access point AP main frame.
Step 8: onboard wireless controller sends on-vehicle information in the mode of clean culture to the IP address of wireless access point AP main frame, then to the IP address of next wireless access point AP main frame, send on-vehicle information with mode of unicast.
When sending on-vehicle information with mode of unicast, onboard wireless controller should target setting IP address (the IP address of receiving terminal).In the IP address to wireless access point AP main frame, send on-vehicle information, the target ip address of setting is the IP address of wireless access point AP main frame.When the IP address to next wireless access point AP main frame sends on-vehicle information, the target ip address of setting is the IP address of next wireless access point AP main frame.
Onboard wireless controller repeats to send two secondary data to different wireless access point AP main frames, its objective is and while avoiding onboard wireless controller to switch, cause loss of data between different wireless access point AP main frames.The wireless access point AP section operation of for example first administering at wireless access point AP main frame 1 at onboard wireless controller, now the target ip address of onboard wireless controller setting is the IP address ip 1 of wireless access point AP main frame 1, when train is switched to wireless access point AP that wireless access point AP main frame 2 administers when interval, due to train and do not know that switching has occurred wireless access point AP main frame, still the IP1 of usining sends data as destination address, causes wireless access point AP main frame 2 not receive this data.Therefore,, when train switches between different wireless access point AP main frames, can there is the loss of short time in the on-vehicle information of its transmission (train position information) data.And when onboard wireless controller sends data, respectively to the wireless access point AP main frame of current communication and next by the wireless access point AP main frame transmission data that are switched to, the loss of data in the time of just can avoiding switching between wireless access point AP main frame.
Step 9: wireless access point AP main frame sends to ground controller by on-vehicle information.
Step 10: finish.
Before method provided by the invention is not receiving the information of ground controller transmission at onboard wireless controller, cannot obtain and set the target ip address that needs to send packet, therefore need to preset the first aim IP address of onboard wireless controller, i.e. the IP address of first AP main frame.In urban track traffic train-ground communication environment, the setting of network configuration and AP main frame is all fixed, so the first aim AP host IP address of onboard wireless controller can arrange.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (2)
1. a train-ground communication method for urban track traffic, is characterized in that described method comprises:
Step 1: for each wireless access point AP main frame arranges fixed ip address;
Step 2: in onboard wireless controller, the list of pre-stored wireless access point AP host IP address;
Step 3: ground controller sends Train Control information to wireless access point AP main frame;
Step 4: wireless access point AP main frame is received after Train Control information, joins the IP address of self in Train Control information;
Step 5: wireless access point AP main frame sends to Train Control information by the mode of broadcast the wireless access point AP being connected with described wireless access point AP main frame, then Train Control information is sent to the onboard wireless controller of train by described wireless access point AP;
Step 6: the onboard wireless controller of train is received after Train Control information, according to the train ID in Train Control information, judge whether described Train Control information is the Train Control information that sends to train self, if described Train Control information is the Train Control information that sends to train self, perform step 7; Otherwise, abandon this Train Control information and perform step 10;
Step 7: onboard wireless controller extracts the IP address of wireless access point AP main frame from Train Control information then finds out the IP address of wireless access point AP main frame and the IP address of next wireless access point AP main frame from the list of wireless access point AP host IP address;
Step 8: onboard wireless controller sends on-vehicle information in the mode of clean culture to the IP address of wireless access point AP main frame, then to the next one, the IP address of the wireless access point AP main frame being switched to is sent to on-vehicle information with mode of unicast;
Step 9: wireless access point AP main frame sends to ground controller by on-vehicle information;
Step 10: finish.
2. method according to claim 1, is characterized in that the list of described wireless access point AP host IP address comprises following field: the IP address of wireless access point AP host id numbering, wireless access point AP position of host machine coding and wireless access point AP main frame.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210247833.9A CN102811415B (en) | 2012-07-17 | 2012-07-17 | Train-ground communication method of urban railway transportation |
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| CN201210247833.9A CN102811415B (en) | 2012-07-17 | 2012-07-17 | Train-ground communication method of urban railway transportation |
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| CN105812181B (en) * | 2016-03-10 | 2019-08-02 | 同济大学 | A kind of distributed communication system maintaining method towards high speed Maglev emulation |
| CN108924257A (en) * | 2018-08-13 | 2018-11-30 | 广州地铁集团有限公司 | A kind of vehicle-mounted log download online system |
| CN110316229B (en) * | 2019-05-28 | 2020-11-24 | 北京交通大学 | Wireless attack detection method for CBTC system vehicle-ground wireless network |
| CN112583662A (en) * | 2020-12-04 | 2021-03-30 | 恒安嘉新（北京）科技股份公司 | Host survival detection method, device, equipment and storage medium |
| CN112788549B (en) * | 2021-01-06 | 2022-04-19 | 武汉虹信科技发展有限责任公司 | CBTC multicast transmission method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102497429A (en) * | 2011-12-13 | 2012-06-13 | 南京恩瑞特实业有限公司 | Multi-redundancy processing method for train-ground data transmission in rail transit |
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| JP5042066B2 (en) * | 2008-02-25 | 2012-10-03 | 株式会社日立製作所 | Train control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102497429A (en) * | 2011-12-13 | 2012-06-13 | 南京恩瑞特实业有限公司 | Multi-redundancy processing method for train-ground data transmission in rail transit |
Non-Patent Citations (2)
| Title |
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| JP特开2009-201335A 2009.09.03 * |
| 陈黎洁，等.CBTC越区切换中断时间分析.《中国铁道科学》.2010,全文. * |
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