CN105636145A - 1.8GHz-based TD-LTE (Time Division Long Term Evolution) system used for subway rail communication - Google Patents
1.8GHz-based TD-LTE (Time Division Long Term Evolution) system used for subway rail communication Download PDFInfo
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- CN105636145A CN105636145A CN201510979562.XA CN201510979562A CN105636145A CN 105636145 A CN105636145 A CN 105636145A CN 201510979562 A CN201510979562 A CN 201510979562A CN 105636145 A CN105636145 A CN 105636145A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
- H04W40/16—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality based on interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
- B61L27/30—Trackside multiple control systems, e.g. switch-over between different systems
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a 1.8GHz-based TD-LTE (Time Division Long Term Evolution) system used for subway rail communication, relating to the field of subway rail communication. The TD-LTE system comprises an EPC (Evolved Packet Core), vehicle-mounted terminal equipment and a plurality of LTE base stations, wherein the TD-LTE system works in a 1.8GHz frequency band; the EPC is connected to a CBTC (Communication Based Train Control) system on the ground; the LTE base stations are distributed along a subway rail line and are connected to the EPC through optical fibers after passing through switches; the vehicle-mounted terminal equipment comprises front LTE CPE (Customer Premise Equipment) and rear LTE CPE, wherein the front LTE CPE and the rear LTE CPE are both connected to the vehicle-mounted CBTC system and are connected to the LTE base stations through a wireless network. The TD-LTE system utilizes the special 1.8GHz frequency band, so that a problem of radio interference is avoided from the source, the driving operation safety is guaranteed to the greatest extent, and meanwhile, the future rail transit development trend and the long-term benefit of the operating unit are both considered.
Description
Technical field
The present invention relates to the underground railway track communications field, be specifically related to a kind of TD-LTE system based on 1.8GHz for underground railway track communication.
Background technology
Urban track traffic has the feature of high speed, high density, uninterruptedly operation so that control the signaling system that track traffic runs, and in ensureing track traffic safe operation, raising track traffic handling capacity etc., plays vital effect. At present, the signaling system of China's new subway circuit, that the overwhelming majority adopts is CBTC (CommunicationBasedTrainControl, communication-based train control) system, CBTC system is by substantial amounts of data exchange between car ground, make the train can uploading position, report in real time receive the control information such as mobile authorization on ground, it is achieved train movable block or virtual block control.
CBTC system has following characteristics:
(1) the continuous two-way train-ground communication passage of Large Copacity is established;
(2) ground and mobile unit all adopt fail-safe computer, process train status, control command in real time, it is achieved continuous print Separation control, access way control, velocity protection, automatic Pilot etc.;
(3) high-precision train location;
(4) device integration is high, simple in construction, and reliability, maintainability are higher.
CBTC system includes ATS (AutomaticTrainSupervision; train automatic monitoring system), CBI (computer interlock system), ATP (time interval between to trains), ATO (ATO), DCS (data communication system) etc.; wherein; the data communication system setting up train-ground communication network is the key in CBTC system, is to ensure that CBTC system is highly reliable, the important foundation of Effec-tive Function.
Data communication system is made up of landline net, car-ground radio net, vehicle-mounted wired network three part, wherein, what car-ground radio mesh portions was commonly used is based on the 2.4GHz wireless local area network technology of IEEE802.11 series standard, and frequency range is 2.4GHz-2.4835GHz. But, in the management of China frequency range, clear stipulaties 2.4GHz is the unlicensed band being not protected. In this band limits, all kinds of radio communication equipments and the non-wireless communication device such as industry, science and medical treatment that meet transmitting power restriction all can use. Owing to types of applications and user concentrate in a large number, result in the ubiquity of air interference.
In November, 2012, there is a lot of suddenly urgent stagnation of movement accident in Shenzhen Metro Shekou line, many trains of ring center line in running way, causes the system cannot be properly functioning, and a large amount of passengers are detained. Survey result is: the wifi router that passenger carries with disturbs the car-ground radio net of data communication system, causes that data communication system cannot complete the transmission of normal information, thus the urgent stagnation of movement accident of train occurs. Afterwards through extensive investigation, it has been found that the CBTC system of all employing 2.4GHz fixed channels is respectively provided with this potential safety hazard, and wireless interference problems has become as the bottleneck affecting track traffic safe operation, constrains the development of rail traffic signal system.
Summary of the invention
The invention aims to overcome the deficiency of above-mentioned background technology, a kind of TD-LTE system based on 1.8GHz for underground railway track communication is provided, use the special frequency range of 1.8GHz, the wireless problem being disturbed has been evaded root, ensure driving operation security substantially, also fully take into account track traffic development trend in the future simultaneously, take into account the long-term benefit of unit of operation.
The present invention provides a kind of TD-LTE system based on 1.8GHz for underground railway track communication, mutual for the communication-based train control system CBTC along the line with underground railway track, this TD-LTE system includes evolution block core net EPC, vehicle-mounted terminal equipment, some LTE base station, this TD-LTE system is operated in 1.8GHz frequency range, EPC is connected with the CBTC system on ground, some LTE base station are distributed along underground railway track circuit, and are connected to EPC by optical fiber through switch; Vehicle-mounted terminal equipment includes headstock LTE customer terminal equipment CPE, tailstock LTECPE, headstock LTECPE, tailstock LTECPE are all connected with vehicle-mounted CBTC system, and is connected with LTE base station by wireless network; EPC configures, manages whole TD-LTE system.
On the basis of technique scheme, described EPC is connected with all of LTE base station by the optical fiber of gigabit Ethernet, switch/router, configures the CBTC system on ground according to demand.
On the basis of technique scheme, described headstock LTECPE, tailstock LTECPE internal operation route selection algorithm, carrying out automatic Route Selection according to wireless status, switching state or EPC instruction, one that selects wireless environment good is transmitted, it is ensured that the service quality QoS of different business.
On the basis of technique scheme, the QoS granularity of described TD-LTE system refine to single business of UE from traditional single-user equipment UE, from source, purpose IP address, port numbers, protocol type parameter region separate service, distribute different QoS for it, it is ensured that the transmission bandwidth of high-priority service and transmission delay.
On the basis of technique scheme, indoor baseband processing unit BBU, far-end RF module RRU are integrated in integrated chassis by described LTE base station.
Compared with prior art, advantages of the present invention is as follows:
(1) TD-LTE system in the present invention uses the special frequency range of 1.8GHz, is absent from the frequency interferences of external system; Support high-speed mobility, it is possible to the high speed urban track traffic that reply coming 10 years is likely to occur; There is higher versatility and market value basis, it is possible to extend the life cycle of system, obtain better investment return ratio; Different business can be carried out prioritization, QoS (QualityofService, the service quality) grade that distribution matches, the data streams such as business, maintenance, alarm are carried out classification. Therefore, the TD-LTE system based on 1.8GHz has not only evaded the wireless problem being disturbed root, has ensured driving operation security substantially, also fully takes into account track traffic development trend in the future simultaneously, takes into account the long-term benefit of unit of operation.
(2) TD-LTE system in the present invention is at the headstock of subway train, the tailstock respectively installs a LTECPE, headstock LTECPE and tailstock LTECPE collaborative work, headstock LTECPE, tailstock LTECPE internal operation route selection algorithm, according to wireless status, switching state or EPC instruction carry out automatic Route Selection, utilize two LTECPE can not coexist the feature of switch area, good one of wireless environment is selected to be transmitted, ensure the QoS (QualityofService of different business, service quality), guarantee data security and integrity, improve systematic function.
(3) the QoS granularity in TD-LTE system is refine to single business from traditional single UE (subscriber equipment) by the present invention, from source, purpose IP address, port numbers, the parameter region separate service such as protocol type, distribute different QoS for it, it is ensured that the transmission bandwidth of high-priority service and transmission delay. In the good situation of wireless environment, all business can normal transmission, but when entering overlapping coverage areas, because the downstream signal of two base stations disturbs each other, overlapping coverage areas delivery flow rate be subjected to very big suppression, now in order to guaranteed qos priority-level high business transmission, to reduce or stop the business of low priority level, recover Deng system wireless signal, when flow increases, the transmission of low priority traffice will be automatically replied.
(4) BBU, RRU are integrated into a cabinet inside by the LTE base station in the TD-LTE system in the present invention, reduce equipment volume, it is simple to equipment portion in orbit lays; Adopt full Aluminum press casting apparatus case, improve radiating capacity of equipment, adapt to track and close applied environment.
(5) train in underground railway track does linearizing motion, the estimation of its uplink downlink can simplify, thus accelerating the algorithm of channel dispatch so that UE can heighten order of modulation with the fastest speed, distribute sufficient wireless resource block, reach optimal transmission bandwidth.
(6) rotating function before increasing, the packet transmission abnormality occurred when switching is recovered, do not send or send abnormal packet before switching and can be forwarded to new base station continuation transmission, and ensure that the order of data is not chaotic, the packet loss index of LTE base station downstream transmission can be significantly improved, completing property of data and safety are improved significantly, it is possible to be effectively improved the performance of TD-LTE system.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the TD-LTE system based on 1.8GHz in the embodiment of the present invention for underground railway track communication.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Shown in Figure 1, the embodiment of the present invention provides a kind of TD-LTE (TimeDivisionLongTermEvolution based on 1.8GHz for underground railway track communication, timesharing Long Term Evolution) system, for the CBTC system interaction with ground, this TD-LTE system includes EPC (EvolvedPacketCore, evolution block core net), vehicle-mounted terminal equipment, some LTE base station, this TD-LTE system is operated in 1.8GHz frequency range, EPC is connected with the CBTC system on ground, some LTE base station are distributed along underground railway track circuit, and it is connected to EPC by optical fiber through switch, each LTE base station is by BBU (BuildingBasebandUnit, indoor baseband processing unit), RRU (RemoteRadioUnit, far-end RF module) it is integrated in integrated chassis, vehicle-mounted terminal equipment includes headstock LTECPE (CustomerPremiseEquipment, customer terminal equipment), tailstock LTECPE, headstock LTECPE, tailstock LTECPE are all connected with vehicle-mounted CBTC system, and is connected with LTE base station by wireless network, EPC configures, manages whole TD-LTE system, for instance: EPC is connected with all of LTE base station by the optical fiber of gigabit Ethernet, switch/router, configures the CBTC system on ground according to demand.
TD-LTE system in the embodiment of the present invention is at the headstock of subway train, the tailstock respectively installs a LTECPE, headstock LTECPE and tailstock LTECPE collaborative work, headstock LTECPE, tailstock LTECPE internal operation route selection algorithm, according to wireless status, switching state or EPC instruction carry out automatic Route Selection, utilize two LTECPE can not coexist the feature of switch area, good one of wireless environment is selected to be transmitted, ensure the QoS (QualityofService of different business, service quality), guarantee data security and integrity, improve systematic function.
The QoS granularity of TD-LTE system is refine to single business from traditional single UE by the embodiment of the present invention, from source, purpose IP address, port numbers, the parameter region separate service such as protocol type, distribute different QoS for it, it is ensured that the transmission bandwidth of high-priority service and transmission delay. In the good situation of wireless environment, all business can normal transmission, but when entering overlapping coverage areas, because the downstream signal of two base stations disturbs each other, overlapping coverage areas delivery flow rate be subjected to very big suppression, now in order to guaranteed qos priority-level high business transmission, to reduce or stop the business of low priority level, recover Deng system wireless signal, when flow increases, the transmission of low priority traffice will be automatically replied.
Tradition LTE system adopts BBU (BuildingBasebandUnit, indoor baseband processing unit)+RRU (RemoteRadioUnit, far-end RF module) base station architecture, usual indoor distributed system adopts the electric distribution mode of cable, and BBU+RRU scheme then adopts the distribution mode of fiber-optic transfer. Base band BBU concentrates and is placed on machine room, and RRU can mount to floor, adopts fiber-optic transfer between BBU and RRU, and RRU is connected to antenna again through coaxial cable and power splitter (bonder) etc., and namely trunk adopts optical fiber, and branch road adopts coaxial cable. BBU, RRU are integrated into a cabinet inside by the LTE base station in TD-LTE system in the embodiment of the present invention, reduce equipment volume, it is simple to equipment portion in orbit lays; Adopt full Aluminum press casting apparatus case, improve radiating capacity of equipment, adapt to track and close applied environment.
TD-LTE technology is the further evolution of third generation mobile communications technology, introduces the enhancement techniques of eating dishes without rice or wine such as OFDMA (OrthogonalFrequencyDivisionMultipleAccess, OFDM) and multi-antenna technology. In conjunction with current metro operation environment and development from now on, in the embodiment of the present invention, the TD-LTE system based on 1.8GHz possesses advantages below:
(1) use special frequency range, be absent from the frequency interferences of external system;
(2) high-speed mobility is supported, it is possible to the high speed urban track traffic that reply coming 10 years is likely to occur;
(3) there is higher versatility and market value basis, it is possible to extend the life cycle of system, obtain better investment return ratio;
(4) different business can be carried out prioritization, QoS (QualityofService, the service quality) grade that distribution matches, the data streams such as business, maintenance, alarm are carried out classification.
To sum up, it can be seen that the TD-LTE system based on 1.8GHz has not only evaded the wireless problem being disturbed root, ensure driving operation security substantially, also fully taken into account track traffic development trend in the future simultaneously, take into account the long-term benefit of unit of operation.
The embodiment of the present invention is specific to the solution of underground railway track communication scheme, feature by the application of abundant research and analysis subway, targetedly tradition LTE system is optimized and improves, so as to more agree with metro environment, more excellent service feature is provided under metro environment, the contrast ginseng of concrete technical specification is shown in Table 1, tradition LTE system adopts the base station architecture of BBU+RRU, TD-LTE system based on 1.8GHz adopts integrated base station architecture, is integrated in integrated chassis by BBU, RRU; The QoS granularity of tradition LTE system is embodied on UE (subscriber equipment), and switch speed is medium, and switching packet loss is more; QoS granularity based on the TD-LTE system of 1.8GHz is embodied in single business of UE, and switch speed is very fast, and switching packet loss is less; The tradition wireless connections of LTE system, channel dispatch complexity, adapt to multiple environment; Based on the wireless connections of TD-LTE system of 1.8GHz, channel dispatch simply, speed significantly improves; LTE base station only monitored by the webmaster of tradition LTE system, and the webmaster based on the TD-LTE system of 1.8GHz monitors LTE base station and CPE simultaneously.
Table 1, based on 1.8GHz TD-LTE system with tradition LTE system technical specification contrast
| Technical specification | TD-LTE system based on 1.8GHz | Tradition LTE system |
| Base station architecture | Integration | BBU+RRU |
| QoS granularity | Single business of UE | Single UE (subscriber equipment) |
| Switch speed | Hurry up | In |
| Switching packet loss | Few | Many |
| Wireless, channel dispatch | Simply, speed improves | Complexity, adapts to multiple environment |
| Network management monitoring | LTE base station and CPE | LTE base station |
Train in underground railway track does linearizing motion, the estimation of its uplink downlink can simplify, thus accelerating the algorithm of channel dispatch so that UE (subscriber equipment) can heighten order of modulation with the fastest speed, distribute sufficient wireless resource block, reaches optimal transmission bandwidth. Rotating function before increasing, the packet transmission abnormality occurred when switching is recovered, do not send or send abnormal packet before switching and can be forwarded to new base station continuation transmission, and ensure that the order of data is not chaotic, the packet loss index of LTE base station downstream transmission can be significantly improved, completing property of data and safety are improved significantly, it is possible to be effectively improved the performance of TD-LTE system.
The embodiment of the present invention can be carried out various modifications and variations by those skilled in the art, if these amendments and modification are within the scope of the claims in the present invention and equivalent technologies thereof, then these amendments and modification are also within protection scope of the present invention.
The prior art that the content not being described in detail in description is known to the skilled person.
Claims (5)
1. the TD-LTE system based on 1.8GHz for underground railway track communication, mutual for the communication-based train control system CBTC with ground, it is characterized in that: this TD-LTE system includes evolution block core net EPC, vehicle-mounted terminal equipment, some LTE base station, this TD-LTE system is operated in 1.8GHz frequency range, EPC is connected with the CBTC system on ground, some LTE base station are distributed along underground railway track circuit, and are connected to EPC by optical fiber through switch; Vehicle-mounted terminal equipment includes headstock LTE customer terminal equipment CPE, tailstock LTECPE, headstock LTECPE, tailstock LTECPE are all connected with vehicle-mounted CBTC system, and is connected with LTE base station by wireless network; EPC configures, manages whole TD-LTE system.
2. the TD-LTE system based on 1.8GHz for underground railway track communication as claimed in claim 1, it is characterized in that: described EPC is connected with all of LTE base station by the optical fiber of gigabit Ethernet, switch/router, configure the CBTC system on ground according to demand.
3. the TD-LTE system based on 1.8GHz for underground railway track communication as claimed in claim 1, it is characterized in that: described headstock LTECPE, tailstock LTECPE internal operation route selection algorithm, automatic Route Selection is carried out according to wireless status, switching state or EPC instruction, one that selects wireless environment good is transmitted, it is ensured that the service quality QoS of different business.
4. the TD-LTE system based on 1.8GHz for underground railway track communication as claimed in claim 1, it is characterized in that: the QoS granularity of described TD-LTE system refine to single business of UE from traditional single-user equipment UE, from source, purpose IP address, port numbers, protocol type parameter region separate service, distribute different QoS for it, it is ensured that the transmission bandwidth of high-priority service and transmission delay.
5. the TD-LTE system based on 1.8GHz for underground railway track communication as according to any one of Claims 1-4, it is characterised in that: indoor baseband processing unit BBU, far-end RF module RRU are integrated in integrated chassis by described LTE base station.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105933917A (en) * | 2016-06-30 | 2016-09-07 | 上海长合信息技术股份有限公司 | Vehicle-ground wireless communication trackside base station of subway and communication method |
| CN106341807A (en) * | 2016-08-29 | 2017-01-18 | 武汉虹信通信技术有限责任公司 | CBTC inter-section CPE switching method and system |
| CN107770287A (en) * | 2017-11-17 | 2018-03-06 | 南京泰通科技股份有限公司 | Interface equipment between a kind of railway STP systems and LTE network |
| CN107820285A (en) * | 2016-09-14 | 2018-03-20 | 卡斯柯信号有限公司 | A kind of wireless channel Active Control Method |
| CN107872778A (en) * | 2017-11-17 | 2018-04-03 | 南京泰通科技股份有限公司 | A kind of full IP railways STP systems based on LTE technologies |
| CN109862071A (en) * | 2018-12-21 | 2019-06-07 | 交控科技股份有限公司 | A kind of method and system that the vehicle-mounted log based on LTE uploads automatically |
| CN110022544A (en) * | 2018-01-09 | 2019-07-16 | 比亚迪股份有限公司 | The comprehensive bearing system of car-ground radio based on LTE-U and method |
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| CN116039393A (en) * | 2023-01-09 | 2023-05-02 | 西南交通大学 | Superconducting magnetic material suspension state monitoring system of superconducting magnetic suspension train |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105933917A (en) * | 2016-06-30 | 2016-09-07 | 上海长合信息技术股份有限公司 | Vehicle-ground wireless communication trackside base station of subway and communication method |
| CN106341807B (en) * | 2016-08-29 | 2019-07-23 | 武汉虹信通信技术有限责任公司 | CPE switching method and system between a kind of vehicle section for CBTC |
| CN106341807A (en) * | 2016-08-29 | 2017-01-18 | 武汉虹信通信技术有限责任公司 | CBTC inter-section CPE switching method and system |
| CN107820285B (en) * | 2016-09-14 | 2020-06-30 | 卡斯柯信号有限公司 | Wireless channel active control method |
| CN107820285A (en) * | 2016-09-14 | 2018-03-20 | 卡斯柯信号有限公司 | A kind of wireless channel Active Control Method |
| CN107872778A (en) * | 2017-11-17 | 2018-04-03 | 南京泰通科技股份有限公司 | A kind of full IP railways STP systems based on LTE technologies |
| CN107770287A (en) * | 2017-11-17 | 2018-03-06 | 南京泰通科技股份有限公司 | Interface equipment between a kind of railway STP systems and LTE network |
| CN110022544A (en) * | 2018-01-09 | 2019-07-16 | 比亚迪股份有限公司 | The comprehensive bearing system of car-ground radio based on LTE-U and method |
| CN110022543A (en) * | 2018-01-09 | 2019-07-16 | 比亚迪股份有限公司 | Track traffic synthetic bearing system |
| WO2019137395A1 (en) * | 2018-01-09 | 2019-07-18 | 比亚迪股份有限公司 | Comprehensive bearing system for track transport |
| WO2019137154A1 (en) * | 2018-01-09 | 2019-07-18 | 比亚迪股份有限公司 | Train-ground wireless integrated bearing system and method employing lte-u |
| CN110022544B (en) * | 2018-01-09 | 2020-11-06 | 比亚迪股份有限公司 | Vehicle-ground wireless comprehensive bearing system and method based on LTE-U |
| WO2019201175A1 (en) * | 2018-04-17 | 2019-10-24 | 江苏必得科技股份有限公司 | Train-ground lte communication system for damage data transmission of train components |
| CN109862071A (en) * | 2018-12-21 | 2019-06-07 | 交控科技股份有限公司 | A kind of method and system that the vehicle-mounted log based on LTE uploads automatically |
| CN113329370A (en) * | 2021-02-08 | 2021-08-31 | 徐州工程学院 | LTE train control information transmission system and method |
| CN116039393A (en) * | 2023-01-09 | 2023-05-02 | 西南交通大学 | Superconducting magnetic material suspension state monitoring system of superconducting magnetic suspension train |
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Application publication date: 20160601 |