The double net network-building method of a kind of subway based on LTETechnical field
The application relates to mobile communication technology field, particularly to the double net network-building method of a kind of subway based on LTE.
Background technology
Communication-based train control (Communication-Based Train Control is called for short CBTC system)For supporting the train operation control system of movable block, it is the automatic control system of a kind of continuous data transmission, profitPosition with high-precision train, it is achieved two-way train-ground communication continuous, jumbo, it is possible to perform train and automatically preventProtect, the function such as ATO and train automatic monitoring.It is applicable not only to newly-built various city rails and hands overLogical, it is also applied for the transformation of old line, different marshalling operation and the movement across lines of different circuit.In recent years, along withThe development of communication technology, especially radio communication, computer networking technology and Digital Signal Processing rapidDevelopment, the redundancy of signaling system, fault-toleranr technique are perfect, and the development developing into CBTC of signal is laid a good foundation,CBTC system is the most gradually approved by signal circle.
CBTC networking at present is mainly undertaken by WIFI network, but underlying cause makes WIFI at subway CBTCIncreasingly it is restricted on signaling bearer:
1, the frequency range that WIFI uses is open frequency range, is easily subject to interference, and this causes CBTC signal to be appliedPoor stability；
2, WIFI coverage distance is short, and website number is many, difficult in maintenance, costly；
3, the speed per hour more than 80 kilometers/hour cannot be supported.
Summary of the invention
This application provides the double net network-building method of a kind of subway based on LTE, to realize the reliable of CBTC businessTransmission, and solve the common network problem of CBTC Yu PIS.
This application discloses the double net network-building method of a kind of subway based on LTE, including:
In subway system, lay two throw the net network, described two throw the net network that network is independent frequency point；
Car at subway is first and the tailstock respectively arranges an in-vehicle wireless device；
Two in-vehicle wireless devices are respectively connected to described two throw the net in network one, and two onboard wireless are setThe standby communication-based train control CBTC equipment being all connected in described subway；
The network that CBTC signal is accessed at this in-vehicle wireless device by wherein in-vehicle wireless device withTransmit between CBTC equipment, CBTC signal and passenger information system PIS signal are passed through another onboard wirelessEquipment transmits between network and the CBTC equipment that this in-vehicle wireless device is accessed.
Two in-vehicle wireless devices be respectively connected to described two throw the net in network one include it is also preferred that the left described:
Throw the net according to described two the amount of bandwidth of network, the onboard wireless of transmission CBTC signal and PIS signal is setStandby access described two and throw the net in the bigger network of bandwidth in network, the in-vehicle wireless device of transmission CBTC signal is connectEnter described two to throw the net in the less network of bandwidth in network.
Two in-vehicle wireless devices be respectively connected to described two throw the net in network one include it is also preferred that the left described:
Using the mode of frequency locking, first and the tailstock two in-vehicle wireless devices of car are locked in described two respectively and throw the net networkTwo frequency bins on.
Two in-vehicle wireless devices be respectively connected to described two throw the net in network one include it is also preferred that the left described:
When network is opened an account, two in-vehicle wireless devices are respectively connected to described two and throw the net network.
It is also preferred that the left the method also includes: by the priority level initializing of CBTC business for higher than PIS business.
It is also preferred that the left the described two bandwidth compound modes throwing the net network include but not limited to: 5M+15M, 15M+5M,10M+10M。
It is also preferred that the left the method also includes:
CBTC server, PIS server and CCTV server all throw the net network simultaneously by switch with described twoConnect；
The CBTC signal of CBTC server carries out individual transmission respectively by described two networks of throwing the net；
The PIS signal of PIS server has only to be transmitted by the described two wherein networks of throwing the net throwing the net network.
As seen from the above technical solution, the double net network-building method of subway based on LTE that the application provides is by groundFerrum system is laid the network of two independent frequency points, and respectively arranges an onboard wireless at the car head of subway with the tailstockEquipment；Two in-vehicle wireless devices are respectively connected to described two throw the net in network one, and by two onboard wirelessEquipment is all connected to the CBTC equipment in described subway；CBTC signal is set by wherein onboard wirelessStandby transmission between network and the CBTC equipment that this in-vehicle wireless device is accessed, by CBTC signal and PISSignal passes through another in-vehicle wireless device between network and the CBTC equipment that this in-vehicle wireless device is accessedTransmission, it is achieved that the transmitting of CBTC business, and solve the common network problem of CBTC Yu PIS.
Accompanying drawing explanation
Fig. 1 is the double net networking structure figure of subway based on LET of the present invention；
Fig. 2 is the preferable networking structure schematic diagram of the present invention one.
Detailed description of the invention
For making the purpose of the application, technical scheme and advantage clearer, develop simultaneously enforcement referring to the drawingsExample, is described in further detail the application.
This application provides a kind of scheme using LTE system carrying CBTC signal.LTE network technical supportTrain high-speed mobile, maximum can support the speed of 500 kilometers/hour, and Ministry of Industry and Information plans to LTE simultaneouslySpecial frequency range, is susceptible to different system interference.The present invention uses A net and the mode of B net Double coverage,Subway system is laid two simultaneously and throws the net network to transmit CBTC signal and PIS (Passenger InformationSystem: passenger information system) signal.A net and B net are two independent frequency points (working band no overlap)Network, the double net of AB can be the sets of bandwidths that 5M+15M, 15M+5M, 10M+10M etc. are different respectivelyClosing, the present invention is not limited to a certain bandwidth compound mode, but can be to include a series of bandwidth selection mode.
Technical solution of the present invention respectively arranges an in-vehicle wireless device, wherein a car at car head and the tailstock of subwayCarry wireless device carrying CBTC signal, another in-vehicle wireless device at end carrying CBTC+PIS signal, twoIn-vehicle wireless device is connected with the CBTC equipment in this subway simultaneously, receives simultaneously and send CBTC signal,That is: CBTC signal is accessed at this in-vehicle wireless device by wherein in-vehicle wireless deviceTransmit between network and CBTC equipment, CBTC signal and passenger information system PIS signal are passed through another portionIn-vehicle wireless device transmits between network and the CBTC equipment that this in-vehicle wireless device is accessed, such as Fig. 1 instituteShow.Generally, the amount of bandwidth of network of throwing the net according to two, the onboard wireless of carrying CBTC+PIS signal setsFor being linked in the network that bandwidth is bigger, it is less that the in-vehicle wireless device of carrying CBTC signal is linked into bandwidthIn network.
Two throw the net network properly functioning time, two in-vehicle wireless devices are respectively connected to A net and B net, vehicle-mounted CBTCEquipment is thrown the net from two simultaneously and is obtained identical CBTC data network, a wherein car of two in-vehicle wireless devicesCarry wireless device and receive PIS business datum simultaneously.When the wherein network failure that A net and B net, thanWhen breaking down such as A net, the in-vehicle wireless device accessing A net does not access B net, but heavy after A network recoveryNew work；While A net breaks down, owing to vehicle-mounted CBTC equipment and the onboard wireless accessing B net setHaving connection between Bei, therefore, vehicle-mounted CBTC equipment still can obtain CBTC data from B net, withoutAffect the use of CBTC business, and, when breaking down due to A net, access the in-vehicle wireless device of A netWithout accessing B net, therefore, unparalleled net switching time, fully achieve the transmitting of CBTC business.
In-vehicle wireless device can have various ways to select A/B net, such as:
1) using the mode of frequency locking, two in-vehicle wireless devices of car first bus tail are locked in A net or B net respectivelyTwo frequency bins on, in-vehicle wireless device can pass through WEB UI interface configurations frequency locking parameter.
2) network ensures that two in-vehicle wireless devices are respectively connected to A net or B net when opening an account.
In-vehicle wireless device of the present invention accesses the mode of A net and B net and is not limited only to both the above, and other can make carCarry wireless device and be fixed on the method in a certain network all within the scope of the present invention comprises.
The priority of CBTC business during in order to ensure CBTC Yu PIS common network, the present invention is by CBTC businessPriority level initializing is higher than PIS business.For example, it is possible to by the QCI (service quality rating mark) of CBTS businessBeing set to 5, and the QCI of PIS business is set to 2, the priority of QCI5 is higher than QCI2, the energy when Bandwidth-ConstrainedEnsure the prioritised transmission of CBTC business, thus strengthen the reliability of CBTC business.
For realizing dual-network backup, the present invention proposes a kind of networking structure as shown in Figure 2.According to Fig. 2, CBTCServer, PIS server and CCTV server all throw the net network (A net and B net) together by switch and twoTime connect.CBTC server data carries out individual transmission respectively by A net and B net, to ensure transmission dataReliability, and PIS server has only to be transmitted by wherein one network of throwing the net.Train car head and carThe terminal of tail be respectively connected to two throw the net in, receive the CBTC server data netted from A net and B simultaneously,Thus realize the function of dual-network backup.
The foregoing is only the preferred embodiment of the application, not in order to limit the application, all in the applicationSpirit and principle within, any modification, equivalent substitution and improvement etc. done, should be included in the application protectWithin the scope of protecting.