CN103945479A - Throughput-based high-speed rail wireless special network cell switching optimal switching point determining method - Google Patents
Throughput-based high-speed rail wireless special network cell switching optimal switching point determining method Download PDFInfo
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Abstract
The invention provides a high-speed rail wireless special network cell switching optimal switching point determining method based on source-destination eNodeB (evolved Node B) throughput for the selecting problem of the optimal switching reference point of a high-speed rail fixed point switching algorithm. A train loads downlink full-load service, implements fixed point switching processes for every switching reference point, records the difference value between throughputs in certain periods before and after switching, operates train records for a plurality of times and calculates the average difference value between the throughputs of every preset candidate switching reference point before and after switching, and selects the point with the lowest difference value of the system throughput before and after switching as the optimal switching reference point. In engineering, the optimal switching reference points can be determined for the entire high-speed rail through the high-speed rail wireless special network cell switching optimal switching point determining method based on the source-destination eNodeB throughput and under a geographic-position-based switching method. The high-speed rail wireless special network cell switching optimal switching point determining method based on the source-destination eNodeB throughput can solve the rapid switching problem in a high-speed moving environment, reduce the number of times of call dropping, improves the switching success rate and enhances the service quality of high-speed broadband mobile services.
Description
Technical field:
The present invention is directed to high-speed railway wireless private network time division duplex Long Term Evolution (Time-Division Duplex Long Term Evolution, TDD-LTE or TD-LTE) community of communication system switches frequent, switching time is short, the requirement that handover success rate is high, on the basis of the existing quick handoff algorithms based on geographical location information, a kind of confirmation method of the high ferro wireless private network community switching optimum switching point based on source target BS throughput is proposed.The method can be applicable to TD-LTE, Frequency Division Duplexing (FDD) Long Term Evolution (Frequency-Division Duplex Long Term Evolution, FDD-LTE or FD-LTE) communication system under high ferro environment in the quick handoff algorithms based on geographical location information.
Background technology:
Conventionally, the handoff procedure in LTE system is divided into following three steps:
1. handover measurement (comprise and measure filtering, algorithm triggers, measurement report);
2. switch decision (handoff algorithms);
3. switch and carry out;
Handover measurement is by user terminal (User Equipment, and LTE base station UE), be called evolved Node B (Evolved Node B, eNode B) complete, switch decision carries out in base station, switch to carry out under the common cooperation of user terminal UE, base station and mobile management entity (Mobility Management entity, MME) and complete.Dispose for high-speed railway TD-LTE networking, what adopt at present is identical networking scheme, and the center frequency point that neighbor cell adopts is identical.LTE system same frequency switch decision event criteria adopts A3 event, when the adjacent cell quality of measuring is higher than Serving cell quality, and difference exceedes certain thresholding, one section of triggered time (Trigger to Time of this state continuance, TTT) after, user terminal UE reports A3 event report to network side, network side is received after this report, carry out switch decision, after adjudicating successfully, adjacent cell is carried out to switching command, because may having multiple adjacent cells, synchronization meets A3 event report simultaneously, therefore, in A3 report, can comprise the adjacent area that multiple cell quality meet switching condition simultaneously.For macrocellular, networking adopts this decision rule can meet the demand of system completely at present.
When train speed per hour reaches 350 kilometers/hour, the base station spacing of 10 kilometers, the time interval of switching between base station is reduced to 100 seconds, has caused frequently passing through of community.Because translational speed improves the lifting receiver threshold level that is bound to.For ensureing transmitting and certain efficiency of transmission, generally all need by dwindling base station spacing, improve and cover field intensity and solved.But this is not unique method, if effectively suppress the lifting degree of at a high speed lower threshold level, maintain the existing base station spacing of 6-10 kilometer as far as possible, by laying Remote Radio Unit (Radio Remote Unit, RRU) will at utmost effectively utilize existing resource, reduce a large amount of engineerings and drop into, and be beneficial to maintenance.But to the resource management of base station, switching time and quality propose higher requirement.
But then, High Speed Railway Trains broadband communication link has himself feature:
Because railway line strip distributes, so being different from the plane of general cellular communication, the distribution of base station covers feature.Thereby cause the predictability of base station distribution, can predicting of train operation circuit, train position can be predicted, the time that train passes through community can predict etc. many to system is helpful can pre-known information, these information can be used for improving the performance of system, reduce the complexity of system and operation, and can contribute to reduce the complexity of some algorithms, obtain than under equal conditions higher spectrum efficiency and transmission quality of general cellular communication, improve the flatness that switch community.
Another factor that affects high-speed railway covering is quick switching.Suppose that switch area size is constant, the higher time of passing through switch area of translational speed is shorter so.Enough fast when user terminal UE translational speed, to such an extent as to being less than system, the time of passing through switch area processes the minimal time delay switching, switching flow cannot complete, and causes call drop.
Due to the particularity of high-speed railway channel circumstance and networking mode, above-mentioned A3 switch decision criterion cannot adapt to high-speed railway environment, and because train is run at high speed, switching time is shorter; In addition, the complicated factor such as landform and high-speed railway periphery electric equipment also can cause larger impact to channel circumstance, adopt A3 switch decision criterion can cause the frequent failure of switching, handover success rate reduces, communication quality declines, customer experience is poor, therefore must consider to adopt the decision rule that adapts to high-speed railway environment.
Quick handoff algorithms based on geographical location information proposes for the particularity of above-mentioned high-speed railway channel circumstance and networking mode, to shorten handover delay, ensure that user terminal UE switches in rational position, meets the requirement of switching fast under high-speed condition.Quick handoff algorithms based on geographical location information crucial step in engineering practice is to determine best position of switching reference point.Switch reference point locations and choose the cutting off rate of the direct user of impact in handoff procedure.
Summary of the invention:
The present invention is intended to the requirement for the quick handoff algorithms based on geographical location information of high-speed railway wireless private network TD-LTE communication system, propose a kind of high ferro wireless private network community based on Target cell, source throughput and switched the confirmation method of optimum switching point, solve the quick switching problem under high-speed mobile environment, reduce communication number of dropped calls, improve handover success rate, strengthen the service quality of high-speed wideband mobile service.
The present invention has realized choosing of optimum switching point in the quick handoff algorithms based on geographical location information, and concrete steps are as follows:
1, according to train operation position, speed and direction, after the network planning completes, generate in advance a adjacent cell list, and the switching position of pre-set each switching band, i.e. longitude and latitude positional information.
2, method is specified in application target community, and the community of shielding in train operation rear only comprises unique adjacent cell frequency point information, i.e. train operation ahead community to the adjacent cell of train report.
3, according to predefined distance threshold value, microzonation is divided into and switches band and non-switching band.Switching in band, according to pre-set sampled point thresholding, overlapping area is divided into some equal portions, get wherein section gap point and switch reference point candidate point set as the best.As shown in drawings, base station A is source eNodeB, and base station B is target eNode B, and overlapping area length is made as D rice, altogether overlay region is divided into n decile, and total n+1 switches reference point.If the A point that to be L rice far away in distance sources base station, for first switches reference point candidate point, is made as P
1, i switches reference point candidate point P
ibe d=L+ (i-1) * D/n rice apart from base station A distance.
4, in experimental network, train runs at high speed, and keep for a long time FTP downloading service to test, also be that train loads descending flowing full amount business, owing to only having user of train in experimental network, cell radio resource can all be distributed to train and use, and therefore the throughput of train is directly subject to train and base station radio link quality determines, in the time that train radio link-quality is relatively good, the full load throughput of train also can be larger accordingly.Therefore throughput parameter when train full load can well reflect the wireless link communication quality of train, switch at some fixing points for train, before and after switching, the difference of the throughput of identical following period of time train has reflected the quality of train performance in the time that this point switches to a certain extent, even switch throughput for the previous period and switch too early at this switching point than switching the rear excessive explanation of throughput, otherwise show to switch evening.Therefore select a good switching reference point to be converted into and select a switching point, make train fix a point to switch throughput poor minimum of full load business before and after the switching that obtains in this position, concentrated the best of switching reference point candidate point that this point just can be used as current sampling is switched reference point.
5. start this reconnaissance of initialization method, by source eNodeB, first switches reference point candidate point P
1be set to initially switch reference point, its geo-location parameter is write to source eNodeB.Train starts according to measuring configuration reporting measurement reports, measurement report comprises train self geographical position information, in the time that train arrives specified handoff candidate point position, the measurement report judgement that source eNodeB reports according to train triggers fixed point handover event, assign fixed point switching command to UE, at selected handoff candidate point position P
1fix a point to switch, record the average throughput of the FTP downloading service of a period of time t (for example 50ms determines according to Practical Project situation) before and after switching, be designated as respectively T
hobeforeand T
hoafter.Calculate the difference of train throughput before and after switching and be designated as Δ T, have Δ T=|T
hobefore-T
hoafter|.
6, to handoff candidate point set { p
1, p
2, p
3... p
nan inner candidate point p
iafter implementation step 5, artificially cut off being connected of train and target eNode B, train is switched back to source eNodeB, the fixed point of Bing Jiang community is switched reference point and is set to adjacent with it the best and switches reference point candidate point p
i+1, to adjacent with it next handoff candidate point p
i+1method shown in carry out step 5, can, in an operation of train through measuring the data of multiple candidate points in switching the process of being with, increase work efficiency like this.
7, because train running speed is very fast, and candidate point distributes than comparatively dense, may be with train by switching reference point candidate point p
iwith switching reference point candidate point p
i+1between inadequate implementation step 6 of time described in method, can be according to the dense degree of actual speed and candidate point, consider to jump and measure, measure the candidate point p with the enough steps performed 6 of distance of a upper candidate point phase cell
j, wherein j-i > 1, will switch reference point candidate point p
jbe set to measure reference point used next time, can reduce like this number of times that in Practical Project practice, train moves repeatedly, increase work efficiency.
8, train repeatedly drives towards target eNode B from source eNodeB, the step 5 that reruns many times, obtain each best multiple measurement data of switching reference point candidate point, each is switched to reference point candidate point data and carry out statistical average, obtain each poor mean value of throughput that switches reference point candidate point and be designated as respectively
then take out the point of the poor mean value minimum of throughput in these points, the best that this point is in these points is switched reference point.More intensive to switching cutting apart of band, the best obtaining is switched reference point also can be more accurate, can cut apart according to actual conditions, needs accurately can cut apart more intensively, need to reduce complexity and can cut apart more sparsely.
Brief description of the drawings
Fig. 1 high ferro scene community covers schematic diagram
The flow chart of the TD-LTE quick handoff algorithms of Fig. 2 based on geographical location information
Fig. 3 switches reference point and divides schematic diagram
The best reference point choosing method flow chart that switches of Fig. 4
Embodiment
Below in conjunction with drawings and Examples, specific embodiment of the present invention is described in further details:
1. after the line of high-speed railway network planning, can obtain the plot planning table of a line of high-speed railway, can precompute the position of the overlapping cover tape of switching of each community of Along Railway according to planning table, the switching band of every a pair of neighbor cell is used to method shown in foregoing invention content, obtain neighbor cell and switch the best switching reference point of the fixed point handoff algorithms of overlapping cover tape, the best that finally generates the fixed point handoff algorithms of a the whole network is switched reference point list, and switching band position and the best reference point locations of switching that base station, respective cell is preserved and oneself is associated.
2. according to the list of the best switching of obtained the whole network reference point locations, the best switching reference point place (or scope) of switching band in each neighbor cell sets up switches mark post (or transducer), and global positioning system (GPS) and corresponding transducer be installed in advance ON TRAINS, in train travelling process, constantly utilize measurement report information to source base station report position information, when train operation is to the best scope of switching reference point, the sensor sensing that train is installed by vehicle body is to best existence of switching reference point mark post, train just sends handover request to eNodeB, source eNodeB response handover request starts to start fixed point hand off signaling flow process, until train is switched to Target cell.
Fig. 1 is that in the present invention, high ferro scene community covers schematic diagram, distribute according to the wire of high-speed railway, the mobile communications network of line of high-speed railway adopts chain dedicated cell to cover, in order to reduce the number of times of switching, adopt the deployment way of Base Band Unit+distributed Remote Radio Unit of BBU (Baseband Unit)+RRU.
Fig. 2 is the flow chart of the quick handoff algorithms of TD-LTE based on geographical location information.This handoff algorithms needs user terminal UE that GPS navigation system is installed, to train position and velocity information are reported to source base station.
According to this flow chart, periodically report measurement information of user terminal UE, comprises active eNodeB and Reference Signal Received Power target eNode B, train running speed and positional information.Source base station triggers changeover program according to the speed of user terminal UE, when user terminal UE speed is greater than the speed threshold value Speed_threshold of setting:
s＞Speed_threshold
Source eNodeB will trigger quick changeover program.When the distance value of the longitude and latitude position coordinates of switching point default in longitude and latitude position coordinates that user terminal UE uploads and source base station meets switching criterion requirement, the distance difference of two positions is less than the threshold value Distance_threshold of a distance:
ΔL＜Distance_threshold
Source eNodeB starts quick switch signaling, and user terminal UE is switched to Target cell.If the speed that the user terminal UE that source eNodeB obtains reports is less than speed threshold value Speed_threshold, adopt conventional switching determination criterion to switch.
Fig. 3 is that the best reference point of switching is divided schematic diagram, and as shown in the figure, it is D rice that overlap zone distance is switched in community, and it is divided into n decile, and total n+1 switches reference point candidate point.Wherein first switches reference point candidate point p
1be L rice apart from the distance of source eNodeB, i switches reference point P
iapart from base station A apart from d=L+ (i-1) * D/n rice.Train advances at utmost speed to target eNode B from source eNodeB.
Fig. 4 is the best reference point choosing method flow chart that switches.
Claims (8)
1. a system of selection of switching reference point for the best of high-speed railway fixed point handoff algorithms process, be applicable in the switching of high-speed railway fixed point, the best is switched the selection of reference point and determined, propose a kind of high ferro wireless private network community based on throughput and switched the best confirmation method that switches reference point, to realize the rapid switching function based on geographical location information of neighbor cell in high-speed railway.
2. method according to claim 1, its thought is: a period of time UE average throughput difference before and after switching according to switching point, before and after selecting to switch, throughput difference smallest point is switched reference point as the best.
3. method according to claim 2, according to pre-set sampled point interval, overlapping area, community is divided into some equal portions, getting wherein section gap point, as the best reference point candidate point set that switches, carries out the best based on this point set and switches reference point selection algorithm.
4. method according to claim 3, in the time that train enters Liang Ge community switching band, loads descending full load business to train, takies the whole resources in community, makes train downlink throughput capacity reach maximum, so that the measurement of a step is calculated after carrying out.
5. method according to claim 4, is characterized in that, successively each best reference point candidate point that switches is carried out to the calculating of throughput difference, and records measurement data.
6. method according to claim 5, repeats method described in claim 5, obtains repeatedly throughput measurement data and carries out statistical average, select switch before and after throughput difference smallest point switch reference point as this cell optimum.
7. every two different switching cells are due to propagated environment difference, and band, also by difference, is switched to different communities in the position of switching reference point for different wireless propagation environment the bests, and best switching reference point should re-start to measure to be chosen.
8. according to described in aforementioned claim, its engineering concrete practice is:
After the line of high-speed railway network planning, obtain the plot planning table of a high-speed railway, precompute the switching band position of each community of Along Railway, to the switching band of every a pair of neighbor cell according to right method described in aforementioned right, obtain all neighbor cells and switch the best switching reference point of band, the best that generates a the whole network is switched reference point list.
The best switching reference point place (or scope) of further switching band in each neighbor cell sets up switches mark post (or transducer), and global positioning system (GPS) and corresponding transducer be installed in advance ON TRAINS, when train operation is to optimum switching point scope, perceive the existence of mark post, send handover request to source base station, start fixed point hand off signaling flow process, until be switched to Target cell.
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| CN106792943A (en) * | 2016-12-30 | 2017-05-31 | 广东海格怡创科技有限公司 | High ferro private network cell switches point detecting method and system |
| CN106879037A (en) * | 2015-12-11 | 2017-06-20 | 展讯通信（上海）有限公司 | Cordless communication network reselecting method, device and terminal based on LTE |
| WO2017201833A1 (en) * | 2016-05-27 | 2017-11-30 | 中兴通讯股份有限公司 | Control method and mobile terminal |
| CN108668329A (en) * | 2018-07-30 | 2018-10-16 | 成都智慧海派科技有限公司 | Base station switching method |
| CN110493832A (en) * | 2019-04-26 | 2019-11-22 | 华为技术有限公司 | A kind of intelligent switch method and device |
| CN114916025A (en) * | 2022-05-09 | 2022-08-16 | 上海擎昆信息科技有限公司 | Tunnel two-end wireless communication network switching method and system |
| CN115942246A (en) * | 2023-03-10 | 2023-04-07 | 成都睿的欧科技有限公司 | Subway vehicle refined positioning method and system based on LTE wireless signal cell |
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| CN114916025A (en) * | 2022-05-09 | 2022-08-16 | 上海擎昆信息科技有限公司 | Tunnel two-end wireless communication network switching method and system |
| CN114916025B (en) * | 2022-05-09 | 2023-11-21 | 上海擎昆信息科技有限公司 | Tunnel two-end wireless communication network switching method and system |
| CN115942246A (en) * | 2023-03-10 | 2023-04-07 | 成都睿的欧科技有限公司 | Subway vehicle refined positioning method and system based on LTE wireless signal cell |
| CN115942246B (en) * | 2023-03-10 | 2023-05-12 | 成都睿的欧科技有限公司 | Subway vehicle fine positioning method and system based on LTE wireless signal cell |
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Application publication date: 20140723 |