CN104486172A - Urban track traffic integrated wireless transmission system based on LTE (long term evolution) - Google Patents
Urban track traffic integrated wireless transmission system based on LTE (long term evolution) Download PDFInfo
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Abstract
The invention relates to an urban track traffic integrated wireless transmission system based on LTE (long term evolution). The urban track traffic integrated wireless transmission system comprises an interface module and two groups of network transmission sub systems, wherein each group of network transmission sub systems comprises LTE core network center equipment, a station baseband processing unit, trackside remote radio equipment, vehicle-mounted equipment and a wireless transmission network, each piece of core network center equipment and the corresponding vehicle-mounted equipment are in network connection through the corresponding trackside remote radio equipment and the corresponding station baseband processing unit, the LTE core network center equipment and an track traffic service system are in network connection through the interface module, and the vehicle-mounted equipment and a vehicle-mounted terminal corresponding to the track traffic service system are in network connection through the interface module. When the urban track traffic integrated wireless transmission system based on the LTE is adopted, combined path transmission of multiple systems in the urban track traffic industry can be realized, the multi-service bearing is realized, in addition, different QoS (quality of service) guarantee strategies are defined according to significance and priority of different services, and the transmission requirement of various services is met.
Description
Technical field
The present invention relates to technical field of rail traffic, particularly a kind of urban track traffic comprehensive wireless transmission system based on LTE.
Background technology
Urban track traffic occurs in city as public transport very early, plays a part more and more important.At present, in the application of urban track traffic, land mobile communication system major part uses public ISM band, is very easily subject to the interference of extraneous wireless environment, thus affects the safe operation of track traffic; Further, by the impact of 802.11 wireless technologys, the translational speed of current wireless transmission method to track traffic has certain restriction.
In application in track transportation, the systems such as existing CBTC, PIS and CCTV adopt WLAN (wireless local area network) to carry out vehicle-ground wireless communication, substantially the demand of present stage urban track traffic can be met, but along with the construction of administrative region of a city circuit and the demand of urban track traffic production integrated service, existing having some limitations property of wireless local area network technology.
Realizing in process of the present invention, inventor finds that in prior art, at least there are the following problems:
Existing urban track traffic wireless transmitting system, the supportive difference of fast mobile terminal speed, the highest translational speed that can support is only 120km/h, very fast to the train data transmission bandwidth suppression ratio of high-speed cruising, packet loss is relatively more serious, and the train high-speed mobile support for administrative region of a city circuit has very large challenge; Air interference is serious, and owing to using open frequency range, domestic consumer is more, and the possibility that there is air interference is larger; Bearing capacity for integrated service is not enough, can not ensure the quality of service requirement of multi-service transport; Coverage is little, and website quantity is many, maintainable poor.
Based on above shortcoming, inventors herein propose a kind of urban track traffic comprehensive wireless transmission system based on LTE to solve above deficiency.
Summary of the invention
For solving the problem, the present invention proposes a kind of urban track traffic comprehensive wireless transmission system based on LTE, for realizing the mixed transfer of the multisystems such as CBTC, PIS, CCTV in urban track traffic industry, bearing multiple service simultaneously.
A kind of urban track traffic comprehensive wireless transmission system based on LTE that the present invention proposes, described system comprises interface module and two group network transmission subsystems;
Every group network transmission subsystem comprises LTE core network central apparatus, station baseband processing unit, trackside radio frequency remote equipment, mobile unit and wireless-transmission network; Described core net central apparatus carries out network by described trackside radio frequency remote equipment and station baseband processing unit with mobile unit and is connected, described LTE core network central apparatus carries out network by described interface module and track traffic operation system and is connected, and described mobile unit carries out network connection by the car-mounted terminal that described interface module is corresponding with described track traffic operation system.
Preferably, described two group network transmission subsystems adopt the wireless network transmissions pattern with the two net in site to carry out the car-ground radio transmission of track traffic.
Preferably, described LTE core network central apparatus comprises data allocation module and QoS sort module; Described data allocation module transmits the source/destination IP address of data, source/destination IP port numbers and/or protocol number according to user and described user is transmitted data-mapping in different carryings; Described QoS sort module is according to the bearer service type preset and the corresponding relation of QoS, set up QoS classification chart, and the priority corresponding according to scale value in described QoS classification chart carries out Resource Allocation in Networks and scheduling.
Preferably, described track traffic operation system includes but not limited to based on the train automatic controlling system communicated, passenger information system and/or CCTV system.
Preferably, described two group network transmission subsystems are separately positioned on the two ends of track train.
Preferably, described two group network transmission subsystems adopt the working method of two net redundancy carrying simultaneously to carry out service bearer.
Preferably, the network's coverage area of described two group network transmission subsystems is overlapping.
Preferably, described LTE core network central apparatus by Internet Protocol Security Ipsec mode with carry out network based on the train automatic controlling system communicated and/or passenger information system and be connected.
Preferably, described system adopts leaky cable or waveguide as wireless transmission medium.
The present invention proposes a kind of urban track traffic comprehensive wireless transmission system based on LTE, this system supports the mixed transfer of the multisystems such as CBTC, PIS, CCTV in urban track traffic industry, can bearing multiple service, set up the pattern that the many nets of rail transit field wireless transmission merge; According to importance and the priority of applied business different in Rail Transit System, define different QoS guarantee strategies, ensure the transmission requirement of multiple business.
Accompanying drawing explanation
Fig. 1 is a kind of urban track traffic comprehensive wireless transmission system module map based on LTE proposed in the embodiment of the present invention;
Fig. 2 is the structural representation of a kind of urban track traffic comprehensive wireless transmission system based on LTE proposed in the embodiment of the present invention;
Fig. 3 is the multi-service car-ground radio configuration diagram based on LTE proposed in the embodiment of the present invention;
Fig. 4 is the same two net frequency planning schematic diagram frequently of the colocation site based on LTE proposed in the embodiment of the present invention;
Fig. 5 is the connection diagram of the urban track traffic comprehensive wireless transmission network based on LTE proposed in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
For problems of the prior art, the present invention proposes a kind of urban track traffic comprehensive wireless transmission system based on LTE, effectively solve the application bottleneck of existing WLAN wireless technology in urban track traffic, and for the car-ground radio system of each specialty of urban track traffic provides comprehensive transmission platform, set up the pattern that the many nets of rail transit field wireless transmission merge.
A kind of urban track traffic comprehensive wireless transmission system based on LTE provided by the invention is introduced in detail below by enumerating specific embodiment.
Fig. 1 is a kind of urban track traffic comprehensive wireless transmission system module map based on LTE proposed in the embodiment of the present invention, as shown in Figure 1, described system comprises interface module 300 and two group network transmission subsystems, and two group network transmission subsystems include first network transmission subsystem 100 and second network transmission subsystem 200; Every group network transmission subsystem comprises LTE core network central apparatus, station baseband processing unit, trackside radio frequency remote equipment, mobile unit and wireless-transmission network; Described core net central apparatus carries out network by described trackside radio frequency remote equipment and station baseband processing unit with mobile unit and is connected, described LTE core network central apparatus carries out network by described interface module and track traffic operation system and is connected, and described mobile unit carries out network connection by the car-mounted terminal that described interface module is corresponding with described track traffic operation system.
Wherein, described track traffic operation system includes but not limited to based on the train automatic controlling system communicated, passenger information system and/or CCTV system etc.
In the embodiment of the present invention, each group network transmission subsystem includes independently LTE core network central apparatus EPC, station baseband processing unit BBU, trackside radio frequency remote equipment RRU and mobile unit TAU, and the composition such as transmission network, wherein station baseband processing unit BBU and trackside radio frequency remote equipment RRU is base station equipment, in the embodiment of the present invention, each group network transmission subsystem and interface module acting in conjunction, all can form complete vehicle-ground wireless communication system, this vehicle-ground wireless communication entire system framework as shown in Figure 2.
In order to ensure the reliability of network, A/B double-network redundant covering design is adopted based on the urban track traffic comprehensive wireless transmission system of LTE in the embodiment of the present invention, comprise two group network transmission subsystems, first network transmission subsystem and A net and second network transmission subsystem and B net.
Fig. 3 is the multi-service car-ground radio configuration diagram based on LTE proposed in the embodiment of the present invention;
As shown in Figure 3, the networking of core net redundancy adopts 2 independently core net central apparatus EPC A/B, be connected by S5/S10/SGi interface between EPC A/B, wherein, S5 interface transmits LTE flattening network user face data and chain of command information, S10 interface transfer control face data, SGi interface transmits user face data.
Wireless-transmission network in A net is only connected by S1 interface with A core net, and wherein, S1 interface is a logic interfacing, the communication interface between LTE eNB and EPC, and the wireless-transmission network in B net is only connected by S1 interface with B core net; In the inside of A wireless-transmission network and B wireless-transmission network, be connected by X2 interface between base station eNB, wherein, X2 interface realizes the intercommunication between identical and different vendor eNBs; The base station A/B of different radio transmission network belongs to different core net central apparatus EPC A/B respectively, the mobile unit TAU that on the base station A/B of different radio transmission network, configuration is different.
In the present embodiment, the terminal of A net is by A wireless network transmissions data, and the terminal of B net is by B wireless network transmissions uplink and downlink data.
Further, the network's coverage area of described two group network transmission subsystems is overlapping.
Further, described two group network transmission subsystems adopt the wireless network transmissions pattern with the two net in site to carry out the car-ground radio transmission of track traffic.
In the embodiment of the present invention, redundant wireless networking adopts the mode with the design of site double-network redundant.Two-tier network overlay area with the two net in site is substantially overlapping, and the coverage mode, covering level etc. of each layer network are netted similar with common list.With two cell allocation different frequencies of base station, site, adjacent same layer cell allocation same frequency band, namely A wireless network uses identical frequency band, and B wireless network uses another frequency band.
Further, described two group network transmission subsystems adopt the working method of two net redundancy carrying simultaneously to carry out service bearer.
Further, described system adopts leaky cable or waveguide as wireless transmission medium.
In the embodiment of the present invention, the redundancy bearing mode work simultaneously of the two net of A/B double-layer network employing, namely there is not active and standby dividing in A/B double-layer network business, simultaneously bearer service data.Base station is arranged with site can save wireless signal mixer; Wireless transmission medium is according to leaky cable or waveguide, and it is few to interrupt position, has lifting for transmission performance; To implement with maintenance convenient simultaneously.With site with the two net frequency planning of frequency as shown in Figure 4.
Wherein, described two group network transmission subsystems are preferably arranged on the two ends of track train.
Further, described LTE core network central apparatus by Internet Protocol Security Ipsec mode with carry out network based on the train automatic controlling system communicated and/or passenger information system and be connected.
In the embodiment of the present invention, for guaranteeing the isolation of the fail safe that CBTC transmits and data, the transmission network of general LTE car-ground radio system is independently built, adopt three-layer network conceptual design, the core net of LTE system and BBU are connected on this transmission network, are connected by the mode of Internet Protocol Security IPsec with CBTC network and PIS network simultaneously, ensure the isolation of network, guarantee CBTC transmission security, its connected mode as shown in Figure 5.
Further, described LTE core network central apparatus comprises data allocation module and QoS sort module; Described data allocation module transmits the source/destination IP address of data, source/destination IP port numbers and/or protocol number according to user and described user is transmitted data-mapping in different carryings; Described QoS sort module is according to the bearer service type preset and the corresponding relation of QoS, set up QoS classification chart, and the priority corresponding according to scale value in described QoS classification chart carries out Resource Allocation in Networks and scheduling.
User data is mapped in different carryings by the contents such as in the embodiment of the present invention, LTE network can according to comprising source/destination IP address, source/destination IP port numbers, protocol number (being such as FTP or HTTP).All data traffics in same bearer ensure obtaining identical QoS, and dissimilar carrying provides different QoS to ensure.
LTE system can realize 9 dispatching priorities, and according to predefined possibility bearer service type, corresponding different service quality (time delay, packet loss etc.) requirements, define 9 QCI, the system priority corresponding according to QCI carries out Resource Distribution and Schedule, and the preferential Support Resource of the less person of its priority distributes and scheduling.LTE QoS classification chart is as shown in table 1, specific as follows:
Table 1 QoS classification chart
Associative list 1, the embodiment of the present invention carries the multiple business such as CBTC, CCTV and PIS based on the urban track traffic comprehensive wireless transmission system of LTE, and the ARP of each business distributes from high to low; Simultaneously according to the requirement of each business to reliability, time delay, system is that it distributes different scale value QCI, and then meets the quality requirement of different business, and wherein, comprehensive wireless transmission system service quality is as shown in table 2, specific as follows:
Table 2 comprehensive wireless transmission system service quality design table
| Sequence number | Type of service | QCI | Data packetloss rate | Priority | End-to-end data delay |
| 1 | CBTC | 5 | 10 -6 | 1 | 100ms |
| 2 | CCTV | 2 | 10 -3 | 4 | 150ms |
| 3 | PIS | 3 | 10 -6 | 5 | 300ms |
In the embodiment of the present invention, the comprehensive wireless transmission system service quality design shown in table 2, is only a preferred version of technical solution of the present invention, not limitation of the invention.
The present invention proposes a kind of urban track traffic comprehensive wireless transmission system based on LTE, there is following beneficial effect:
Support the mixed transfer of the multisystems such as CBTC, PIS, CCTV in urban track traffic industry, can bearing multiple service;
According to importance and the priority of applied business different in Rail Transit System, define different QoS guarantee strategies, ensure the transmission requirement of multiple business;
Carry out the network architecture conceptual design of urban track traffic broadband mobile platform, the application of LTE mobile platform in engineering project can be instructed.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and replacement, these improve and replace and also should be considered as protection scope of the present invention.
Claims (9)
1. the urban track traffic comprehensive wireless transmission system based on LTE, it is characterized in that, described system comprises interface module and two group network transmission subsystems, and every group network transmission subsystem comprises LTE core network central apparatus, station baseband processing unit, trackside radio frequency remote equipment, mobile unit and wireless-transmission network; Described core net central apparatus carries out network by described trackside radio frequency remote equipment and station baseband processing unit with mobile unit and is connected, described LTE core network central apparatus carries out network by described interface module and track traffic operation system and is connected, and described mobile unit carries out network connection by the car-mounted terminal that described interface module is corresponding with described track traffic operation system.
2. the system as claimed in claim 1, is characterized in that, described two group network transmission subsystems adopt the wireless network transmissions pattern with the two net in site to carry out the car-ground radio transmission of track traffic.
3. the system as claimed in claim 1, is characterized in that, described LTE core network central apparatus comprises data allocation module and QoS sort module; Described data allocation module transmits the source/destination IP address of data, source/destination IP port numbers and/or protocol number according to user and described user is transmitted data-mapping in different carryings; Described QoS sort module is according to the bearer service type preset and the corresponding relation of QoS, set up QoS classification chart, and the priority corresponding according to scale value in described QoS classification chart carries out Resource Allocation in Networks and scheduling.
4. the system as described in claim as arbitrary in claim 1-3, is characterized in that, described track traffic operation system includes but not limited to based on the train automatic controlling system communicated, passenger information system and/or CCTV system.
5. the system as described in claim as arbitrary in claim 1-3, is characterized in that, described two group network transmission subsystems are separately positioned on the two ends of track train.
6. the system as described in claim as arbitrary in claim 1-3, is characterized in that, described two group network transmission subsystems adopt the working method of two net redundancy carrying simultaneously to carry out service bearer.
7. system as claimed in claim 6, is characterized in that, the network's coverage area of described two group network transmission subsystems is overlapping.
8. system as claimed in claim 4, is characterized in that, described LTE core network central apparatus by Internet Protocol Security Ipsec mode with carry out network based on the train automatic controlling system communicated and/or passenger information system and be connected.
9. the system as claimed in claim 1, is characterized in that, described system adopts leaky cable or waveguide as wireless transmission medium.
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| CN108566633A (en) * | 2018-03-21 | 2018-09-21 | 广州地铁集团有限公司 | A kind of vehicle ground data transmission method and system |
| CN109005553A (en) * | 2018-03-26 | 2018-12-14 | 南京地铁建设有限责任公司 | It is a kind of that servicing method in the system of CBTC business is carried based on LTE |
| CN108834103A (en) * | 2018-05-03 | 2018-11-16 | 上海大学 | The big data of rail traffic LTE-M communication system Train Control business transmission monitors system and method |
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| CN110049056A (en) * | 2019-04-24 | 2019-07-23 | 广州铁科智控有限公司 | A kind of urban track traffic multi signal real-time processing method and system |
| CN110620821A (en) * | 2019-09-27 | 2019-12-27 | 天津七一二通信广播股份有限公司 | Broadband data transmission module for rail transit and implementation method |
| CN115696263A (en) * | 2022-09-02 | 2023-02-03 | 北京交通大学 | Urban rail vehicle-mounted service transmission method based on node cost and service priority |
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