CN102843444B - In train control system, apply the method for IP address-based Radio priority level - Google Patents
In train control system, apply the method for IP address-based Radio priority level Download PDFInfo
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Abstract
The invention discloses a kind of method of applying IP address-based Radio priority level in train control system, it is characterized in that, for wireless train control system devices allocation subnet and corresponding IP address, safety means are divided into safe subnet, and non-security classification of equipment is non-security subnet; In the data of the safe subnet of wireless channel prioritised transmission. The present invention is directed to the feature of train control system communication, the wireless transmission method in optimization data communication subsystem.
Description
Technical field
The invention belongs to Train Control field, be mainly used in dividing and determining in train control system according to IP addressThe priority of data message, guarantees the preferential real-time Transmission of security control information.
Background technology
Along with informationalized development, the feeler of the communication technology, computer technology has extended to the each of social lifeIndividual corner. Automation in any field, information-based leap, all be unable to do without the support of these technology, trainSignal controlling field is no exception. Train control system (CBTC) based on communication is exactly by continuous, twoTo train-ground communication carry out Train Control, thereby realize train safe and system conevying efficiency significantlyImprove. At present, CBTC technology also becomes the mainstream technology of train control system.
Train-ground communication adopts the CBTC system of wireless mode to be called wireless CBTC system. Wireless CBTC systemBasic characteristics are: by continuous train-ground communication instead of determine train position by track circuit. OneTrain-installed controller determines train position by the responder on detection track, in database, searches themOrientation, and measure the distance of traveling from the previous responder detecting. Train-installed controller is logicalCross the two-way wireless communication that uses train the to arrive trackside position to this train of trackside CBTC device report. Two-wayLetter has also been strengthened operation and the supervision to train. Therefore, train can ensure and other train safe intervalsSituation under, with the operation of shorter running interval, and the flexibility that improves Train Control.
Wireless train control system is mainly divided into three layers in logic: management level, operation layer and execution level. ManagementLayer mainly provides train automatically to control and monitoring function. Operation layer, by operational system control software, is responsible for rowThe logical operations such as car personal distance, train permissible velocity and route are chain. Operation result is with the shape of communication messageFormula sends to performance element by data communication subsystem. Execution level is mainly divided into two parts, and trackside control is establishedStandby and onboard control device. Its major function is the instruction of explaining from operation layer, and establishes according to these instructionsDetermine train speed and train is controlled at train safe interval, transmit position, speed, fortune about train simultaneouslyThe data such as the state of line direction and Vehicle Controller are to operation layer. The entity of each layer passes through data communication subsystem(DCS) carry out the mutual of information.
From the security attribute of data, the information of transmitting between operation layer and execution level relates to safe controlInformation processed, between management level and operation layer and management level and execution level, transmit be do not relate to safeInformation, therefore, should need to guarantee security control information as the data communication subsystem of information transmitting mediumPrioritised transmission. But at present, the transmission in train control system of all security information and non-vital dataShare a data communication network, and adopt identical data transmission grade, do not embody the excellent of secure dataFirst level.
Data between operation layer and execution level trackside equipment are transmitted by cable network, and operation layer withData between execution level mobile unit are by cable network and the common transmission of wireless network. Wired networkNetwork has enough advantages in bandwidth, and its priority also can arrange by the QoS in mature protocol simultaneously(QoS(QualityofService) service quality, is a kind of security mechanism of network, is for separatingA kind of technology of the problems such as network delay and obstruction of determining. To key application and multimedia application, work as network over loadingOr when congested, QoS can guarantee that important service amount is not postponed or abandons, and ensures the efficient operation of network simultaneously)Realize. Therefore, particularly security control data of data often become with time delay in the bandwidth of transmission in wireless networkFor passing judgment on one of key factor of whole data communication network performance quality. How according to train control systemFeature, ensures the prioritised transmission of security control data in wireless network part, realizes end-to-end priority controlBecome the problem that needs solution.
Summary of the invention
Technical problem to be solved by this invention is to provide one and applies based on IP address in train control systemThe method of Radio priority level, it can be for the feature of train control system communication, optimization data is logicalWireless transmission method in letter subsystem.
In order to solve above technical problem, the invention provides one and apply based on IP in train control systemThe method of the Radio priority level of address, is characterized in that, for wireless train control system devices allocation subnet andCorresponding IP address, safety means are divided into safe subnet, and non-security classification of equipment is non-security subnet; In nothingThe data of the safe subnet of line channel prioritised transmission.
Beneficial effect of the present invention is: for the feature of train control system communication, optimization data is logicalWireless transmission method in letter subsystem. Issue the instruction of Vehicle Controller for Regional Control Center, andVehicle Controller passes back to relevant train position, speed, traffic direction and the vehicle-mounted control of Regional Control CenterThe relevant security control data such as the state of device, guarantee its prioritised transmission in wireless network.
For the IP address of the same subnet of management level devices allocation, become non-security subnet.
For the IP address of the same subnet of devices allocation of operation layer and execution level, become safe subnet.
The equipment of described execution level comprises Region control equipment, trackside control appliance and onboard control device.
Source address and destination address to packet are analyzed, and are safe subnet by source address and destination addressPacket be mapped to the high priority of MAC layer, in wireless channel prioritised transmission.
By trackside and onboard wireless unit, source address and the destination address to packet analyzed.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Accompanying drawing 1 is based on IP address Radio priority level implementation schematic diagram;
Accompanying drawing 2 is end-to-end time delay schematic diagrames of communication between Region control equipment and onboard control device;
Accompanying drawing 3 is wireless train control system exemplary plot.
Detailed description of the invention
The present invention is directed to the feature of train control system communication, wireless in optimization data communication subsystemTransmission means. Issue the instruction of Vehicle Controller for Regional Control Center, and Vehicle Controller passes back toThe states of relevant train position, speed, traffic direction and the Vehicle Controller of Regional Control Center etc. are correlated withSecurity control data, guarantee its prioritised transmission in wireless network.
The present invention, according to the logical construction of wireless train control system, is the same subnet of management level devices allocationIP address (non-security IP subnet), for the equipment of operation layer and execution level (comprise Region control equipment,Trackside control appliance and onboard control device) distribute the IP address (safe IP subnet) of same subnet.
Belonging to what between the equipment of safe subnet, transmit is security control information, need to ensure prioritised transmission.For the Wireless Telecom Equipment in data communication system, by source IP address and object in analyzing IP packetSubnet under IP address, can analyze the attribute of judgement information, simultaneously according to certain dispatching algorithm, ensuresThe prioritised transmission of security control information. For the Wireless Telecom Equipment in data communication subsystem, (trackside is wirelessAccess point AP and the STA of vehicle-mounted mobile radio station), increased possess above-mentioned functions semantic conversion module andAfter scheduler module, can determine and realize data priority:
Semantic conversion module: analyze the affiliated subnet of source IP address and object IP address of packet, according toThe type of affiliated subnet, is mapped to different MAC layer grades and (for example, is set as 8 according to IEEE802.1PIndividual grade). In general, train safe control information must be mapped to the limit priority of MAC layer. ForOther supervision and management information of train control system can be mapped to the inferior priority of MAC layer. Meanwhile, rightCan be mapped to lower priority in information such as the train video monitorings likely merging in the future.
Scheduler module: based on MAC dispatching algorithm, for each MAC layer grade safeguarded corresponding queue, and pointJoin different weights. Due to the weighted of different brackets frame, thus their select keep out of the way the average phase of time delayHope also different. Like this, in the time that Channel Detection arrives the free time, the average waiting time delay of high-grade frame is little, accessProbability is larger.
The present invention is by the semantic conversion of IP address and MAC layer grade mapping, and MAC dispatching algorithm, protectsHaving demonstrate,proved the secure data that source IP address and object IP address all belong to safe subnet can pass on when minimumDefeated.
By IP address-based Radio priority level control, ensure that train control system security control data existWireless portion can prioritised transmission, and the propagation delay time of security control data can meet train control system safetyThe requirement of operation, has promoted train control system performance.
Region control equipment with operation layer passes to the security control information between the onboard control device of execution levelDefeated is example, by Radio priority level control, can ensure end to end data transmission delay be controlled at 10ms withIn: network switch time delay 0.5ms in the station in cable network; The average delay of VPN equipment is 1.6ms;Backbone switches, because quantity is more, generally has the time delay of 1ms; The exchange of trackside wireless access internal institutionMachine uses storage and forward mechanism, in medium communication flows situation, will cause prolonging of average 0.8msLate; The average out to 6ms of the time delay of trackside wireless access unit and vehicle-mounted mobile radio station.
Taking wireless train control system shown in accompanying drawing 3 as example.
The first step, for equipment in wireless train control system carries out the planning of IP address. For management level devices allocationThe IP address (non-security IP subnet) of same subnet, for the equipment of operation layer and execution level (comprises regionControl appliance, trackside control appliance and onboard control device) distribute IP address (the safe IP of same subnetSubnet).
Second step, improves trackside and onboard wireless unit. According to shown in accompanying drawing 1, increase semantic conversion module andScheduler module. Semantic conversion module is by analyzing the affiliated son of source IP address and object IP address of packetNet, according to the type of affiliated subnet, is mapped to different MAC layer grades, wherein between safe subnet equipmentInformation be mapped to the highest MAC priority. Scheduler module, by dispatching algorithm, arrives idle in Channel DetectionTime, high-grade frame is preferentially sent to wireless channel.
Of the present invention by IP address-based Radio priority level control, guarantee belongs to the equipment of safe subnetBetween communication transmit with limit priority, and the following priority transmission of other information. And then ensure to be listed asIn vehicle control, the propagation delay time in wireless network part of security control category information also meets Train Control systemThe service requirement of system, realizes priority control end to end. These information comprise: train safe interval, rowCar permissible velocity, train position, current of traffic and the chain operation result of route etc.
The present invention is not limited to embodiment discussed above. Above the description of detailed description of the invention is intended toIn order to describe and illustrate the technical scheme the present invention relates to. Apparent conversion based on the present invention enlightenment orSubstitute and also should be considered to fall into protection scope of the present invention. Above detailed description of the invention is used for disclosing thisBright best implementation method, to make those of ordinary skill in the art can apply multiple enforcement of the present inventionMode and multiple alternative reach object of the present invention.
Claims (5)
1. in train control system, apply a method for IP address-based Radio priority level, its featureBeing, is wireless train control system devices allocation subnet and corresponding IP address, and safety means are divided into safetySubnet, non-security classification of equipment is non-security subnet; In the data of the safe subnet of wireless channel prioritised transmission;
Belonging to what between the equipment of safe subnet, transmit is security control information, in data communication systemWireless Telecom Equipment, divide by subnet under source IP address in analyzing IP packet and object IP addressAnalyse the attribute of judgement information, the packet that is all safe subnet by source IP address and object IP address is mapped toThe high priority of MAC layer, in wireless channel prioritised transmission.
2. as claimed in claim 1ly in train control system, apply IP address-based Radio priority levelMethod, it is characterized in that, for the IP address of the same subnet of management level devices allocation, become non-security sonNet.
3. as claimed in claim 1ly in train control system, apply IP address-based Radio priority levelMethod, it is characterized in that, be the IP address of the same subnet of devices allocation of operation layer and execution level, becomeFor safe subnet.
4. as claimed in claim 3ly in train control system, apply IP address-based Radio priority levelMethod, it is characterized in that, the equipment of described execution level comprise Region control equipment, trackside control appliance andOnboard control device.
5. as claimed in claim 1ly in train control system, apply IP address-based Radio priority levelMethod, it is characterized in that source address and the destination address to packet by trackside and onboard wireless unitAnalyze.
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| CN201210336711.7A CN102843444B (en) | 2012-09-12 | 2012-09-12 | In train control system, apply the method for IP address-based Radio priority level |
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| CN201210336711.7A CN102843444B (en) | 2012-09-12 | 2012-09-12 | In train control system, apply the method for IP address-based Radio priority level |
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| CN104702717B (en) * | 2015-04-03 | 2018-01-12 | 上海自仪泰雷兹交通自动化系统有限公司 | The planing method of data communication system IP address in CBTC |
| US11716372B2 (en) | 2019-10-01 | 2023-08-01 | Honeywell International Inc. | Method and system for centralized management of access subnetwork selection for mobile platform communications |
| CN112319551A (en) * | 2020-11-10 | 2021-02-05 | 交控科技股份有限公司 | Wireless communication method and system for train carriage |
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| CN1700632A (en) * | 2004-05-19 | 2005-11-23 | 株式会社日立制作所 | Information transmission system |
| CN101350134A (en) * | 2008-08-29 | 2009-01-21 | 同济大学 | Mechanism and system for transmitting vehicle emergency message based on DSRC |
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| CN1700632A (en) * | 2004-05-19 | 2005-11-23 | 株式会社日立制作所 | Information transmission system |
| CN101350134A (en) * | 2008-08-29 | 2009-01-21 | 同济大学 | Mechanism and system for transmitting vehicle emergency message based on DSRC |
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