CN102497429A - Multi-redundancy processing method for train-ground data transmission in rail transit - Google Patents
Multi-redundancy processing method for train-ground data transmission in rail transit Download PDFInfo
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Abstract
The invention discloses a multi-redundancy processing method for train-ground data transmission in rail transit. The method is characterized in that: a redundancy design is adopted for all hardware related to security transmission, wherein 1, dual wireless network cards are used for a trackside access point (AP) and vehicular stations (STA); 2, a vehicular STA is configured at each of the head and tail of a train, and the STAs at the head and tail of the train are connected with each other through a special train line to realize mutual hot backup; 3, a central communication gateway is subjected to redundancy configuration to realize the mutual hot backup of the two STAs; 4, the redundancy design is adopted for a trackside data transmission network; and 5, wireless signals can realize complete redundancy coverage. Four copies are made by the central communication gateway for a downlink data message which is transmitted to a vehicular application host by a ground application host, transmitted to a destination train through four different wireless links, verified by an STA corresponding to a vehicular destination host and transmitted to the destination host; and an uplink data message in an opposite direction is subjected to the same processing. By the multi-redundancy processing method, identical data can be transmitted through a plurality of different links at the same time, the influence of a single point failure on data transmission quality in a system is avoided, the packet loss rate of the system reaches 10<-6> magnitude, and data transmission security is high.
Description
Technical field
The present invention relates to car in a kind of track traffic-ground transfer of data multiple redundancy treatment mechanism; Especially a kind of multilink transmission technology that provides the car-ground double-direction radio data communication of high reliability, high availability to design for urban track traffic CBTC system, transfer of data multiple redundancy processing method in car ground in specifically a kind of track traffic.
Background technology
As everyone knows, early stage railway signal system mainly utilize interlock device guarantee train on fixed track by assigned direction safety, operation effectively.Current; Technology rapid development along with computer, communication and automatic control; City rail traffic signal system has developed into an advanced person's automatic control system---and be train automatic controlling system (being called for short the ATC system), it is the principal security of train safe, efficient operation.The ATC system develops into present movable block system by early stage fixed blocking system---promptly based on the Train Control (CBTC) of communicating by letter; Data communication system (DCS) is intended to solve the key issue in car in the CBTC system-ground transmission, and it is reliable and stable to guarantee in train high-speed mobile process that promptly the other network of train and rail is connected.Transmission CBTC high security message can not produce the packet loss phenomenon, and any Single Point of Faliure of simultaneity factor does not influence the transmission of CBTC safe packet.
Raising reliability of data transmission and availability commonly used at present, the mode that redundant ability is provided mainly is to set up A, two wireless networks of B simultaneously.
Summary of the invention
The objective of the invention is demand, invent transfer of data multiple redundancy processing method in car ground in a kind of track traffic according to high security and high reliability request in the CBTC transfer of data.
Technical scheme of the present invention is:
Transfer of data multiple redundancy processing method in car ground is characterized in that the hardware relevant with safe transmission is all adopted Redundancy Design in a kind of track traffic, and described hardware redundancy design comprises: in other AP of rail and vehicle-mounted STA, use two wireless network cards 1.; 2. all dispose vehicle-mounted STA at the headstock and the tailstock, and headstock and tailstock STA interconnect through professional train line all, realize that heat is equipped with each other; 3. make center communication gate redundant configuration, heat is equipped with each other; 4. the other data transmission network of rail adopts Redundancy Design; 5. the wireless signal fully redundance covers; After the downlink data message that the Ground Application main frame mails to the vehicular applications main frame duplicates four parts by the center communication gate; Mail to the purpose train through four different Radio Links, issue destination host after by the corresponding STA of vehicle-mounted destination host four parts of messages being verified processing again; Rightabout uplink data messages is also passed through same processing; Therefore, CBTC uses message simultaneously via four different link transmission, guarantees to transmit not packet loss, and intrasystem any Single Point of Faliure does not influence the transmission of data.
The other data transmission network of described rail adopts Redundancy Design for adopting double-core+high-performance optical fiber looped network.
One of described headstock and tailstock STA are at headstock, and another is at the tailstock; The default gateway of vehicular applications main frame all points to STA direct-connected with it, and therefore the data from In-vehicle networking at first arrive corresponding vehicle-mounted STA; This STA copy data also adds fields such as timestamp, sequence number, calls data forwarding module on the one hand through radio port, and the AP other through rail mails to communication gate; On the other hand, data pass to opposite end STA through special-purpose train line, connect situation by opposite end STA according to the self radio link, mail to communication gate via the other AP of rail independently; Therefore, all ATC applied business data are transferred to the Ground Application system through these two STA simultaneously, and are same, and the data of Ground Application system are transferred to the vehicular applications system via two STA simultaneously; Two STA provide the full redundancy to communication link, have guaranteed reliabilty and availability with the redundancy of equipment and link.
Beneficial effect of the present invention:
1, many different links of disposal of Redundancy mechanism of the present invention transmit identical data simultaneously, and the Single Point of Faliure in the system does not influence data transmission quality, and the system packet loss of making reaches 10
-6Magnitude;
2, disposal of Redundancy mechanism of the present invention both had been applicable to that 3 got 2 vehicular applications main frame and are applicable to that also 2 take advantage of 2 to get 2 vehicular applications main frame, flexible configuration;
3, disposal of Redundancy mechanism of the present invention can effectively be protected threats such as " deletion ", " insertion ", " repetition ";
4, disposal of Redundancy mechanism ability of the present invention and ipsec encryption authentication framework combine, and realize the high security of transfer of data.
Description of drawings
Fig. 1 is system topology figure of the present invention.
Fig. 2 is a transfer of data sketch map of the present invention.
Fig. 3 is a CG flow chart of the present invention.
Fig. 4 is a STA flow chart of the present invention.
Fig. 5 is that MAC Address of the present invention obtains and forwarding process figure.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Shown in Fig. 1-5.
Transfer of data multiple redundancy processing method in car ground in a kind of track traffic; Key all adopts Redundancy Design to the hardware relevant with safe transmission, and described hardware redundancy design comprises: in other AP (Access Point WAP) of rail and vehicle-mounted STA (Station radio station), use two wireless network cards 1.; 2. all dispose vehicle-mounted STA at the headstock and the tailstock, and headstock and tailstock STA interconnect through professional train line all, realize that heat is equipped with each other; 3. make center communication gate redundant configuration, heat is equipped with each other; 4. the other data transmission network of rail adopts Redundancy Design (as adopting double-core+high-performance optical fiber looped network); 5. the wireless signal fully redundance covers; After the downlink data message that the Ground Application main frame mails to the vehicular applications main frame duplicates four parts by the center communication gate; Mail to the purpose train through four different Radio Links, issue destination host after by the corresponding STA of vehicle-mounted destination host four parts of messages being verified processing again; Rightabout uplink data messages is also passed through same processing; Therefore, CBTC uses message simultaneously via four different link transmission, guarantees to transmit not packet loss, and intrasystem any Single Point of Faliure does not influence the transmission of data.Though on the physical connection, have more loop in the system, adopt transmission end to end, eliminate 2 layer loops and 3 layer loops, make system works stable, there is not the broadcast storm problem.
Data forwarding comprises data uplink and descending two parts.Data uplink is meant vehicular applications main frame applied host machine transmission data earthward, arrives destination host through STA, AP, communication gate; Data downstream is meant that data arrive the vehicular applications main frame from the Ground Application main frame via communication gate, AP and STA.
On two STA of same train, one at headstock, and another is at the tailstock.The default gateway of vehicular applications main frame all points to STA direct-connected with it, and therefore the data from In-vehicle networking at first arrive corresponding vehicle-mounted STA; This STA copy data also adds fields such as timestamp, sequence number, calls data forwarding module on the one hand through radio port, and the AP other through rail mails to communication gate; On the other hand, data pass to opposite end STA through special-purpose train line, connect situation by opposite end STA according to the self radio link, mail to communication gate via the other AP of rail independently.Therefore, all ATC applied business data are transferred to the Ground Application system through these two STA simultaneously, and are same, and the data of Ground Application system are transferred to the vehicular applications system via two STA simultaneously.Therefore, two STA provide the full redundancy to communication link, with the higher reliabilty and availability of redundancy acquisition of equipment and link.The work signal is as shown in Figure 2.
It is as shown in Figure 1 that data communication system is simplified network topology structure, and its main component devices has:
1. communication gate CG (Communication Gateway communication gate) is a terrestrial interface equipment, the STA that management simultaneously is all completely.The data that needs are forwarded to the vehicular applications main frame also increase the information word of routing except that increasing information such as timestamp, sequence number, guarantee that data accurately mail to purpose train and destination host.The train that receives is mail to the data message of ground host, carry out disposal of Redundancy and checking after, mail to the ground destination host.
2. vehicle-mounted STA is vehicle-mounted interface equipment, and needs are forwarded to the data of Ground Application main frame, and vehicle-mounted STA increases information such as timestamp, sequence number, is transmitted to corresponding communication gate through 4 different space links, transmits ground data in the other direction to corresponding mobile unit.Respectively have a chassis to carry STA in each train head and the tailstock, each unit has two wireless network cards that are operated in different channels, sets up related with the other AP of different rails respectively.
3. the effect of the other AP of rail is the wired and wireless network of bridge joint; For providing Radio Link, vehicle-mounted STA inserts; Pass through rational system design; Guarantee that the other wireless signal fully redundance of rail covers, the other different AP of the respectively related rail of two STA of headstock (or tailstock), such train has just had 4 different links.The other adjacent AP of rail has line end to be connected with communication gate through different switches or optical networking, and when the cable network that single AP or its connected lost efficacy, each train and communication gate still had more than 2 or 2 link exists.
The redundancy of hardware link also needs software to cooperate to realize the resources effective utilization, also may influence system's operate as normal otherwise not only waste resource, produces as network generation loop, end-to-endly receives problems such as duplicate packages, time delay be excessive.
When the data forwarding layer adopted link redundancy mechanism, the flow process that transmits an IP grouping from the Ground Application main frame to the vehicular applications main frame was following:
1. communication gate is intercepted and captured the IP grouping that the Ground Application main frame mails to on-vehicle host.
2. divide into groups to add ID, time stamp and route selection information to IP, new IP divides into groups as the packet of data communication system inside, and adds forwarding queue to.
3. 4 parts of the new packet copies in the forwarding queue and use UDP (User Datagram Protocol UDP) to be transmitted to vehicle-mounted STA through 4 links of corresponding train.
4. mail to and the own grouping that directly is connected the vehicular applications main frame if vehicle-mounted STA receives, then at first check to transmit whether there has been this grouping in the data pack buffer:, then abandon this grouping if exist according to ID and time stamp; If do not exist, the ID that then adds this grouping and time stamp are to buffer memory, and the forwarding initial IP is grouped into corresponding on-vehicle host.If vehicle-mounted STA receives the grouping of mailing to same train opposite end, then be transmitted to the opposite end through train head and the tail wire link.
5. the vehicular applications main frame receives this grouping.
The flow process that transmits a grouping from the vehicular applications main frame to the Ground Application main frame is similar with the former, and vehicle-mounted STA intercepts and captures IP that the vehicular applications main frame mails to the Ground Application main frame and divides into groups afterwards that redundancy is forwarded to the ground communication gateway, is transmitted to the corresponding ground applied host machine again.
Key technology mainly contains link redundancy configuration, packet disposal of Redundancy, MAC (Media Access Control medium access control system) address dynamic process and data intercepting and capturing and caching process etc.
Adopt redundant transmission mechanism to improve the reliability of data forwarding, but still need additional corresponding treatment mechanism reduce the influence of redundant transmission, otherwise can produce the end-to-end serious problems such as duplicate packages and forward delay be excessive of receiving using.
The data forwarding disposal of Redundancy flow process of communication gate and vehicle-mounted STA such as Fig. 3, shown in Figure 4.
Communication gate and vehicle-mounted STA are in the process of carrying out data forwarding, if do not take other measures, from receiving data to sending the data after handling the memory copying operation that needs for several times, this will cause bigger influence to forwarding performance.In order to reduce the influence of memory copying to forwarding performance, adopted the measure that reduces internal memory operation as much as possible, specific as follows:
1. owing to need before the raw data packets of intercepting and capturing, contents such as interpolation ID and time stamp come it is carried out encapsulation operation; So when using Packet Socket intercepted data frame; Be not the original position that is stored in it free core, but be that ID and time stamp etc. add the enough memory headrooms of content reservation in front.Directly add information words such as ID and time stamp then in the raw data packets front; Can directly send when transmitting the packet after encapsulating through UDP Socket; Need not add other memory copying operation, reduce taking of CPU and memory source greatly, improve forwarding performance.
2. pass through Packet Socket when applied host machine is transmitted raw data packets; Exist the respective hosts MAC Address not in the situation of cache list, dynamically obtain MAC Address and need spend the regular hour, at this moment need dump to packet in the formation of ARP metadata cache; After receiving arp reply, could transmit raw data packets; The whole raw data packets of unloading also will spend certain CPU and memory source, and especially the traffic carrying capacity burdensome time, this is huge cost to system resource.In order to reduce influence, the whole raw data packets of our not unloading, but deposit its internal memory first address and packet size in the formation of ARP metadata cache has reduced the taking of CPU and memory source, and has improved forwarding performance to a certain extent.
3. passing through Packet Socket when applied host machine is transmitted raw data packets; Be not to dump to other region of memory to raw data packets yet; But directly skew institute adds the size of information such as ID and time stamp, direct with this first address as the parameter that will send data.
Communication gate and vehicle-mounted STA need obtain the MAC Address of respective hosts when applied host machine sends initial data frame, for flexibility and the portability that improves system, taked dynamically to obtain MAC Address method and relevant treatment mechanism, and be as shown in Figure 5.
The ARP agreement is to obtain the agreement of respective hosts data-link layer address according to network layer address, mainly is the MAC Address that obtains respective hosts according to the IP address here.Owing to ask to receive that from sending ARP arp reply need expend the regular hour; Although generally in 1ms; But still can cause influence definitely, so ARP request list (depositing the ARP request of having sent) and ARP metadata cache formation (depositing the initial data frame that does not get access to MAC Address but sent the ARP request) on the basis of MAC Address tabulation, have been increased to forwarding performance.Actual data forwarding is divided for 3 kinds of situation:
1. the destination host MAC Address that needs to transmit initial data frame exists in the MAC cache list, then directly transmits this Frame.
2. corresponding MAC Address does not exist in cache list, and does not send the request of corresponding MAC Address, then sends the ARP request of corresponding MAC Address, and adds request to the ARP request list, and dumps to the formation of ARP metadata cache to initial data frame.
3. corresponding MAC Address does not exist in cache list, but the request of having sent corresponding MAC Address then directly dumps to the formation of ARP metadata cache to initial data frame.
The present invention does not relate to all identical with the prior art prior art that maybe can adopt of part and realizes.
Claims (3)
1. car ground transfer of data multiple redundancy processing method in the track traffic is characterized in that the hardware relevant with safe transmission is all adopted Redundancy Design, and described hardware redundancy design comprises: in other AP of rail and vehicle-mounted STA, use two wireless network cards 1.; 2. all dispose vehicle-mounted STA at the headstock and the tailstock, and headstock and tailstock STA interconnect through professional train line all, realize that heat is equipped with each other; 3. make center communication gate redundant configuration, heat is equipped with each other; 4. the other data transmission network of rail adopts Redundancy Design; 5. the wireless signal fully redundance covers; After the downlink data message that the Ground Application main frame mails to the vehicular applications main frame duplicates four parts by the center communication gate; Mail to the purpose train through four different Radio Links, issue destination host after by the corresponding STA of vehicle-mounted destination host four parts of messages being verified processing again; Rightabout uplink data messages is also passed through same processing; Therefore, CBTC uses message simultaneously via four different link transmission, guarantees to transmit not packet loss, and intrasystem any Single Point of Faliure does not influence the transmission of data.
2. transfer of data multiple redundancy processing method in car ground in the track traffic according to claim 1 is characterized in that the other data transmission network of described rail adopts Redundancy Design for adopting double-core+high-performance optical fiber looped network.
3. transfer of data multiple redundancy processing method in car ground in the track traffic according to claim 1 is characterized in that one of described headstock and tailstock STA at headstock, and another is at the tailstock; The default gateway of vehicular applications main frame all points to STA direct-connected with it, and therefore the data from In-vehicle networking at first arrive corresponding vehicle-mounted STA; This STA copy data also adds fields such as timestamp, sequence number, calls data forwarding module on the one hand through radio port, and the AP other through rail mails to communication gate; On the other hand, data pass to opposite end STA through special-purpose train line, connect situation by opposite end STA according to the self radio link, mail to communication gate via the other AP of rail independently; Therefore, all ATC applied business data are transferred to the Ground Application system through these two STA simultaneously, and are same, and the data of Ground Application system are transferred to the vehicular applications system via two STA simultaneously; Two STA provide the full redundancy to communication link, have guaranteed reliabilty and availability with the redundancy of equipment and link.
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| CN102811415A (en) * | 2012-07-17 | 2012-12-05 | 北京交通大学 | Train-ground communication method of urban railway transportation |
| CN103179131A (en) * | 2013-04-09 | 2013-06-26 | 北京锦鸿希电信息技术股份有限公司 | Communication method, device and system for train control |
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| CN102811415B (en) * | 2012-07-17 | 2014-11-05 | 北京交通大学 | Train-ground communication method of urban railway transportation |
| CN102811415A (en) * | 2012-07-17 | 2012-12-05 | 北京交通大学 | Train-ground communication method of urban railway transportation |
| CN103179131A (en) * | 2013-04-09 | 2013-06-26 | 北京锦鸿希电信息技术股份有限公司 | Communication method, device and system for train control |
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| CN111405524A (en) * | 2020-03-25 | 2020-07-10 | 卡斯柯信号有限公司 | Multi-vehicle-ground wireless communication system and communication method thereof |
| CN111405524B (en) * | 2020-03-25 | 2022-07-12 | 卡斯柯信号有限公司 | Multi-vehicle-ground wireless communication system and communication method thereof |
| CN113721447A (en) * | 2020-05-26 | 2021-11-30 | 北京机械设备研究所 | Reconfigurable vehicle control system based on redundancy and control method |
| CN113721447B (en) * | 2020-05-26 | 2023-08-25 | 北京机械设备研究所 | Vehicle control system based on redundancy reconfiguration and control method |
| CN112078630A (en) * | 2020-08-25 | 2020-12-15 | 通号城市轨道交通技术有限公司 | Train control system |
| CN112078630B (en) * | 2020-08-25 | 2022-10-18 | 通号城市轨道交通技术有限公司 | Train control system |
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