CN105704673B - A kind of rail traffic radio data transmission method based on LTE - Google Patents
A kind of rail traffic radio data transmission method based on LTE Download PDFInfo
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- CN105704673B CN105704673B CN201610235076.1A CN201610235076A CN105704673B CN 105704673 B CN105704673 B CN 105704673B CN 201610235076 A CN201610235076 A CN 201610235076A CN 105704673 B CN105704673 B CN 105704673B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/06—Reselecting a communication resource in the serving access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/20—Performing reselection for specific purposes for optimising the interference level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/025—Services making use of location information using location based information parameters
- H04W4/027—Services making use of location information using location based information parameters using movement velocity, acceleration information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The present invention proposes a kind of rail traffic radio data transmission method based on LTE, is one kind in the limited situation of the resource of frequency range, the method for solving the problem of co-channel interference between train LTE data transmission network.The present invention triggers frequency range switching or ICIC by the way of judging that train speed and distance are combined by base station, it allows the UE progress alien frequencies on train to be switched to the enterprising line frequency multiplexing of same frequency range, is staggered to complete interference elimination with other adjacent train frequencies to reach.This invention ensures that when no enough frequency ranges carry out interference elimination using different frequency ranges to supply two trains, train-installed terminal new method can solve the interference problem in station between two trains in such a way that dynamic frequency switches, to train transmission performance and capacity impact all very littles.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly it relates to it is a kind of based on the rail traffic of LTE without
Line data transmission method.
Background technique
City Rail Transit System has freight volume as the important means and effective measures for solving the problems, such as city traffic
Greatly, the advantages that speed is fast, safe, punctual, comfortable, and urban land resource comprehensive development and utilization can be driven, to the long-range hair in city
Exhibition is of great significance.Meanwhile as Information and Communication Technology is to broadband rapid development, the need of rail traffic informatization
Ask also constantly promotion.Rail transit field wireless communication system is mainly used for arranging as the critical system of rail traffic informationization
Two-way, stable, reliable, high speed wireless data transmission channel is established between vehicle and ground, other business provide for rail traffic
Basic bearer network.System is mainly made of train station subsystem and onboard subsystem two parts
By Fig. 1, it can be seen that, there are two vehicle-mounted UE on train, also there are two wireless base stations at station, this is that one kind generally makes
AB Double coverage scheme, two net work provide Double redundancy backup, will not interfere with each other in arbitrary two frequency ranges.UE A
Access base station A, UE B access base station B, A net signal will not impact the transmitted in both directions that B is netted, and equally, B net signal will not
A net transmitted in both directions is impacted.
Current track traffic vehicle-ground wireless communication system has more and more used LTE as air interface transmission technology,
AB net uses completely self-contained double LTE network systems, works in two different frequency ranges, while undertaking the biography of the data between vehicle ground
Defeated, two network datas are mutually backups.
Train individually track when driving, since A net and B net use different frequency ranges, two net of AB of same vehicle
Between do not interfere with problem, but AT STATION/transfer stop when, it may occur that the problem of two trains meet, due to the same frequency of LTE
Interference can have interference if the frequency range that this two trains use is overlapped between this two trains, serious can influence logical
The quality of letter.It technically can solve this problem as long as two vehicles use different frequency ranges, but underground railway track can be supplied at present
The frequency range that traffic uses is very limited, usually only 10MHZ, and A net and B net each need 5MHZ to come using a train will just make
With 10MHZ, two trains are supplied without enough frequency ranges and use different frequency ranges.Therefore need to propose that a kind of new method is come
Solve the interference problem in station between two trains.
Summary of the invention
Present invention solves the technical problem that:
In the limited situation of the resource of frequency range, the problem of co-channel interference between train LTE data transmission network is solved.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
Frequency range switching or ICIC are triggered by the way of judging that train speed and distance are combined by base station, make same row
UE on vehicle carry out alien frequencies be switched to the enterprising line frequency multiplexing of same frequency range or switching at runtime distribution frequency range, make on two trains away from
It is in different frequency ranges from nearest vehicle-mounted UE, so that adjacent train frequency is staggered to complete interference and eliminate.
Include the following steps；
Step 1: base station frequency range switching/ICIC is triggered with a distance from station by the speed and train for detecting train；
Step 2: the mode that VMIMO/ICIC is switched to after triggering carries out data transmission；
Step 3: when launch train sails out of station, base station released by detecting speed and the distance of train frequency range switching/
ICIC。
The step 1 the specific implementation process is as follows:
Base station judges whether train will arrive at a station by the speed and train for detecting train with a distance from station, sets door
Limit value M1 and M2, when train speed be less than leaving from station distance of thresholding M1 and train be less than thresholding M2, then trigger frequency range switching/
ICIC。
The specific implementation process of the step 2 includes one of following two processing mode:
(1): the vehicle-mounted UE on same train is switched to same frequency range by base station, uses the UE on same train identical
Frequency range does VMIMO transmission, i.e., the UE on same train transmits data to a base station using identical running time-frequency resource；
(2): frequency range used in vehicle-mounted UE on two vehicles is coordinated in base station, and switching at runtime distributes frequency range, make on two trains away from
Different frequency ranges is in from nearest vehicle-mounted UE.
The step 3 the specific implementation process is as follows:
Base station judges whether train i.e. will be leaving from station by the speed and train of train with a distance from station, sets threshold value
M3 and M4 is greater than thresholding M4 when train speed is greater than leaving from station distance of thresholding M3 and train, then releases frequency range switching/ICIC, vehicle
The transmission mode for carrying UE reverts to original mode.
Compared with prior art, the present invention triggers frequency by the way of judging that train speed and distance are combined by base station
Section switching or ICIC allow the UE progress alien frequencies on same row car team vehicle to be switched to the enterprising line frequency multiplexing of same frequency range or dynamically cut
It changes distribution frequency range, the vehicle-mounted UE that distance is nearest on two trains is made to be in different frequency ranges, to reach and adjacent two trains frequency
Rate is staggered to complete interference elimination.This invention ensures that using different frequencies in no enough frequency ranges to supply two trains
When Duan Jinhang interference is eliminated, train-installed terminal new method can solve in station two in such a way that dynamic frequency switches
Interference problem between train, to train transmission performance and capacity impact all very littles.
Detailed description of the invention
Fig. 1 is train AB net schematic diagram (prior art)；
Fig. 2 is the VMIMO scheme schematic diagram in the present invention；
Fig. 3 is the ICIC scheme schematic diagram in the present invention；
UE frequency error factor schematic diagram when train meets when Fig. 4 is ICIC scheme；
UE frequency error factor schematic diagram when train meeting when Fig. 5 is ICIC scheme；
UE frequency error factor schematic diagram when train is stopped when Fig. 6 is ICIC scheme；
Fig. 7 is flow chart of the method for the present invention.
Keyword is explained:
LTE Long Term Evolution long term evolution
VMIMO Virtual Multiple-Input Multiple-Output virtual MIMO
UE User Equipment user equipment
ICIC Inter Cell Interference Coordination inter-cell interference cancellation
Specific embodiment
The invention will be further described for embodiment shown in reference to the accompanying drawing.
The technical solution adopted in the present invention is divided into two kinds:
Scheme 1: train is flexibly switched to VMIMO mode and is transmitted AT STATION
The subway train of same route or different routes meets AT STATION, when two trains are all phases using AB net and AB net
Same frequency range, then two vehicles can generate serious interference AT STATION, in order to avoid the generation of interference, scheme needs two in AT STATION
The frequency range of vehicle is staggered.
Base station judges whether train will arrive at a station by the speed or train of train with a distance from station, can set here
A fixed threshold value is less than thresholding when train speed is less than leaving from station distance of thresholding or train, then starts frequency range switching, originally arrange
The vehicle-mounted UE 1A of vehicle is carried out data transmission using A frequency range and base station A, and vehicle-mounted UE 1B is transmitted using B frequency range and base station B.
After triggering switching, the vehicle-mounted UE 1A and UE 1B of train will use same frequency range, and frequency range A or frequency range B are ok, and with it is individual
One base station (base station A or B) carries out data transmission, as shown in Figure 2.It to be staggered with the frequency range of another of station train and base station.
Similarly, the UE2A on another at this time train and 2B is also using same frequency range.In order to guarantee the capacity of transmission, at this time same row
Two UE on vehicle do VMIMO transmission using identical frequency range, i.e., two UE on same train are provided using identical time-frequency
Source transmits data to a base station.Channeling in this way, the vehicle-mounted UE of two such can be reached using a band frequency
To two sections of effect, the capacity of data transmission ensure that.Low speed or stationary state when train stops station is also beneficial to VMIMO
The performance of performance.
When launch train sails out of station, base station is also to trigger train-installed UE by the speed or distance of detection train
It is switched to original transmission mode, i.e. two vehicle-mounted UE are from being converted into original AB net mode to the VMIMO of same base station transmission.
Scheme 2: it avoids interfering AT STATION by way of ICIC
The subway train of same route or different routes meets AT STATION, when two trains are all phases using AB net and AB net
Same frequency range, then two vehicles can generate serious interference AT STATION, in order to avoid the generation of interference, scheme needs to use up in AT STATION
The frequency range for measuring the vehicle-mounted UE of two vehicles is staggered.
Base station judges whether train will arrive at a station by the speed or train of train with a distance from station, can set here
A fixed threshold value is less than thresholding when train speed is less than leaving from station distance of thresholding or train, then triggers ICIC.Guarantee two column
The nearest vehicle-mounted UE of distance is in different frequency ranges on vehicle.As shown in figure 3, the vehicle-mounted UE 1A of train 1 with it is vehicle-mounted on train 2
UE 2A is closer, and at this moment base station will guarantee that the two UE are in different frequency ranges.
When launch train sails out of station, base station is also to trigger train-installed UE by the speed or distance of detection train
It releases ICIC and is switched to original transmission mode.
As shown in fig. 7, specific embodiment is carried out according to following procedure:
Step 1: frequency range switching/base station ICIC is triggered with a distance from station by the speed or train of train and is led in base station
The speed or train for crossing train judge whether train will arrive at a station with a distance from station, set threshold value M1 and M2 here, when
Train speed is less than leaving from station distance of thresholding M1 and train and is less than thresholding M2, then triggers frequency range switching/ICIC.
Step 2: the mode that VMIMO/ICIC is switched to after trigger threshold carries out data transmission
Scheme 1: the vehicle-mounted UE A and UE B of train are switched to same frequency range by base station, are at this moment needed UE a certain on train
It is switched in the base station of another UE, such as UEA is kept not change, trigger the alien frequencies switching of UEB, UEB is switched to the base of UEA
Stand A, at this moment dispatches running time-frequency resource identical with UEA for UEB and carries out data transmission, and two vehicle-mounted UE carry out VMIMO transmission.Base station
A receives the data of two UE, and two parts of data are Double redundancy backup.The principle of switching is the work of train-installed UE after guaranteeing switching
Frequency range will be staggered with the UE of another train in station.Base station will appreciate that the case where two vehicles is coordinated.
Scheme 2: frequency range used in vehicle-mounted UE on two vehicles is coordinated in base station, can switching at runtime distribution frequency range, guarantee two
The nearest vehicle-mounted UE of distance is in different frequency ranges on train.
Such as: when two vehicles meet, the frequency use condition of vehicle-mounted UE is as shown in Fig. 4, Fig. 5, Fig. 6.
Step 3: when launch train sails out of station, base station released by detecting speed or the distance of train frequency range switching/
ICIC
Base station judges whether train i.e. will be leaving from station, sets door here by the speed or train of train with a distance from station
Limit value M3 and M4, when train speed be greater than leaving from station distance of thresholding M3 and train be greater than thresholding M4, then release frequency range switching/
ICIC.The transmission mode of vehicle-mounted UE reverts to original AB net mode.
Claims (2)
1. a kind of rail traffic radio data transmission method based on LTE, it is characterised in that: judge train speed using by base station
The mode combined with distance triggers frequency range switching or ICIC, so that UE on same train is carried out alien frequencies and is switched to same frequency range
Enterprising line frequency multiplexing or switching at runtime distribute frequency range, so that the nearest vehicle-mounted UE of distance is in different frequencies on two trains
Section makes adjacent train frequency be staggered to complete interference and eliminate in turn；Wherein, frequency range switching refers in the two cars to meet AT STATION
The vehicle-mounted UE of a train be switched to same frequency range, the vehicle-mounted UE of another train is switched to another frequency range, also, after switching
Same train UE do VMIMO transmission using identical frequency range；
Include the following steps；
Step 1: base station frequency range switching/ICIC is triggered with a distance from station by the speed and train for detecting train；
Step 2: the mode that VMIMO/ICIC is switched to after triggering carries out data transmission；VMIMO refers to virtual Multiinputoutput,
ICIC refers to inter-cell interference cancellation；
Step 3: when launch train sails out of station, base station released by detecting speed and the distance of train frequency range switching/
ICIC；
The step 1 the specific implementation process is as follows:
Base station judges whether train will arrive at a station by the speed and train for detecting train with a distance from station, sets threshold value
M1 and M2 is less than thresholding M2 when train speed is less than leaving from station distance of thresholding M1 and train, then triggers frequency range switching/ICIC；
The specific implementation process of the step 2 includes one of following two processing mode:
(1): the vehicle-mounted UE on same train is switched to same frequency range by base station, and the UE on same train is made to use identical frequency range
VMIMO transmission is done, i.e., the UE on same train transmits data to a base station using identical running time-frequency resource；
(2): frequency range used in vehicle-mounted UE on two vehicles is coordinated in base station, and switching at runtime distributes frequency range, makes on two trains distance most
Close vehicle-mounted UE is in different frequency ranges.
2. a kind of rail traffic radio data transmission method based on LTE according to claim 1, it is characterised in that: institute
State step 3 the specific implementation process is as follows:
Base station judges whether train i.e. will be leaving from station by the speed and train of train with a distance from station, setting threshold value M3 and
M4 is greater than thresholding M4 when train speed is greater than leaving from station distance of thresholding M3 and train, then releases frequency range switching/ICIC, vehicle-mounted UE
Transmission mode revert to original mode.
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| CN106792557B (en) * | 2016-12-13 | 2021-01-15 | 武汉虹信科技发展有限责任公司 | Data scheduling method in LTE (Long term evolution) rail transit scene |
| CN106792907B (en) * | 2016-12-23 | 2019-08-20 | 武汉虹信通信技术有限责任公司 | A kind of LTE baseband processing unit real-time scheduling method based on antennal interface |
| CN107396403A (en) * | 2017-08-30 | 2017-11-24 | 武汉虹信通信技术有限责任公司 | A kind of anti-interference method and device for track traffic wireless communication system |
| CN107659969B (en) * | 2017-09-15 | 2020-09-08 | 武汉虹信通信技术有限责任公司 | Method and device for improving switching success rate in rail transit system |
| CN108366399B (en) * | 2018-01-23 | 2020-06-16 | 北京邮电大学 | Frequency band switching method and system for CBTC (communication based train-ground) communication system of urban rail transit |
| JP2020025199A (en) * | 2018-08-07 | 2020-02-13 | パナソニックＩｐマネジメント株式会社 | Management server and management method |
| CN118104298A (en) * | 2022-09-26 | 2024-05-28 | 北京小米移动软件有限公司 | Identification method and device of vehicle-mounted terminal equipment |
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| CN102387556B (en) * | 2011-10-18 | 2014-01-29 | 西南交通大学 | Inter-cell handover method of train-ground communication based on cooperative multipoint transmission in high-speed mobile environment |
| WO2015025613A1 (en) * | 2013-08-20 | 2015-02-26 | 株式会社日立製作所 | Radio communication system, control method thereof, and base station apparatus |
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