CN101483895A - Overhand optimization method for GSM-R network - Google Patents
Overhand optimization method for GSM-R network Download PDFInfo
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- CN101483895A CN101483895A CNA2009100780214A CN200910078021A CN101483895A CN 101483895 A CN101483895 A CN 101483895A CN A2009100780214 A CNA2009100780214 A CN A2009100780214A CN 200910078021 A CN200910078021 A CN 200910078021A CN 101483895 A CN101483895 A CN 101483895A
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Abstract
The invention discloses a method for optimizing GSM-R network cross-zone switching. According to the thread coverage characteristic of a railway GSM-R network, under a situation only single network coverage is considered, adjacent districts only have two, that is, a front one and a back one, if the motion direction of a train is affirmed, a switching target district can be determined, thus simplifying a target district list. The invention puts forward a method for determining the motion direction of the train, namely, a BSC switching recording statistical method, which refers to that the previous switching of one special user at the BSC is tracked, the target districts switched orderly by the user in previous N (N is more than and equal to 3) times switching are recorded, and the motion direction of the train is judged according to the order list of districts which are stored in the coverage area of the BSC and follow the network direction. Therefore, a newly obtained switching adjacent district list can simplify switching process, shortening switching time, improving switching reliability, solving the toggle switching problem of districts within the network, and meanwhile avoiding the phenomenon of backward switching.
Description
Technical field
The present invention relates to a kind of GSM-R network handover optimization method, belong to moving communicating field.
Background technology
In the GSM-R system, the radius of sub-district is less relatively, and train is high-speed cruising along the railway, and call can experience repeatedly and switch.During calling out, travelling carriage is responsible for measuring the signal strength signal intensity of wireless subsystem down-link performance and peripheral cell, the base station is regularly measured and is assessed the signal of travelling carriage, when detecting abnormal conditions, alarm signal is sent to MSC (mobile switching centre) or BSC (base station controller) immediately in the base station, MSC or BSC can seek a new sub-district or new channel, and send a switching after finding; Otherwise the communication meeting is proceeded on original channel, and simultaneously, the process of attempting switching periodically repeats.If finish switching, channel originally just is released, and more than is whole handoff procedure.
In the handover of railway GSM-R network, the adjacent sub-district of scanning process is generally former and later two, BTS (base station transceiver) and MS (travelling carriage) need measure 2 sub-districts, and select one of them preferably in selection course, need long switching time.In the higher environment of train speed per hour, if it is long to switch time, train also comes and switches just to have left the overlay region, because speed is very high, time less than in the former sub-district, will cause communication disruption.In addition, when the base station signal at train rear was strong, it was switching target small area that network will be selected the sub-district at rear according to handoff algorithms, but train travels forward, will cause table tennis to switch.Therefore, how designing switching adjacent cell list and definite target switching cell is simplification handoff procedure, the switching of avoiding rattling, prevents that travelling carriage from back switching, improving the key issue of handover success rate.
Simultaneously, be the process of a random distribution because the field intensity in somewhere covers, the antenna-feedback system of each travelling carriage and receiver performance be difference to some extent also, and the variation on wireless field density covers can not significantly be reflected to each above the travelling carriage.Even for same travelling carriage, neither be duplicate in different by the behavior that same zone showed.Find these problems, must follow the tracks of for a long time and add up a plurality of travelling carriages.These have all proposed challenge to maintenance work.
But, it is that wire covers that railway covers, and train also only may be advanced forward, according to these characteristics, we can improve existing handoff algorithms, and design is suitable for the handoff algorithms of the uniqueness of railway, so both can improve switching efficiency, can avoid above-mentioned described problem effectively again, finally improve success rate for switching and efficient greatly, reduce and switch the break period that transfer of data is caused.
Summary of the invention
The invention provides a kind of GSM-R network handover optimization method, characteristics according to the covering of railway GSM-R network wire, only considering under the situation that single net covers, neighbor cell has only former and later two, know the direction of motion of train by certain technology, determine the Target cell of switching, thereby simplify the Target cell tabulation.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of GSM-R network handover optimization method, utilize Abis interface at the BSC place preceding the switching several times to a certain specific user who is in dedicated mode do tracking, N time (N 〉=3) switch the Target cell that this user is switched successively before the record, in its coverage of corresponding BSC stored along network side to the sub-district sequential list judge the traffic direction of train, optimize the handover after carrying out in this BSC control range again behind the cell list.
The advantage of switching optimization method provided by the invention is:
1, simplifies adjacent cell list, shortened switching time, improved the reliability of switching, solved the table tennis switching problem of sub-district in the net, avoided the phenomenon of back switching simultaneously.Success rate for switching and efficient have been improved widely.
2, do not need MS to cooperate, whole process just utilize in the Abis interface monitoring to the specific user handoff procedure make track record and get final product.
3, can not come according to the operation method of train the optimization aim sub-district except N time initial switching, handover afterwards can both accurately be judged the direction of motion of train according to this method.
4, this method does not require the speed of train, is fit to certainly be applied to represent in the bullet train communication of current social development trend.
5, implement simply, the software that only needs to revise among the BSC gets final product.
Description of drawings
Fig. 1 GSM-R chain-shaped network;
Fig. 2 switch decision flow chart.
The present invention is further described below in conjunction with drawings and Examples.
Embodiment
The present invention proposes a kind of method of the GSM-R of optimization network handover.The characteristics that cover according to railway GSM-R network wire considering that neighbor cell has only former and later two under the situation that single net covers, if know the direction of motion of train again, can be determined the Target cell that switches, thereby simplify the Target cell tabulation.The present invention proposes a kind of method of definite train movement direction, be that BSC switches the record statistic law, preceding the switching several times at the BSC place to a certain specific user cooked tracking, N time (N 〉=3) switch the Target cell that this user is switched successively before the record, its coverage of corresponding BSC stored interior along network side to the sub-district sequential list can judge the traffic direction of train.
For each MS, BSC will carry out following operation when carrying out switching judging:
A, in each MS enters this BSC control range and before carrying out the handoff request first time, tables of data among the initialization BSC, if the GSM-R chain-shaped network as shown in Figure 1, and in the BSC internal memory contains its coverage along network side to the sub-district sequential list, shown in the sub-district sequential list of table 1BSC stored;
Table 1
| The sub-district serial number | The BTS | Cell name | |
| 1 | BTS1 | C 1 | |
| 2 | BTS2 | C 2 | |
| …… | …… | …… | |
| N | BTS?N | C N | |
| …… |
When b, MS carry out handoff request, if the not enough N of switching times then carries out conventional handover, and the record data table;
If c switches for the N+1 time, then judge current of traffic according to tables of data, optimize adjacent cell list, carry out again and switch;
D, if switching times greater than N+I, then carries out conventional handover according to the adjacent cell list after optimizing.
Described step b specifically comprises:
Step b1: be recorded in BTS title and the place cell name of switching forward direction BSC reporting measurement reports;
Step b2: the best Target cell frequency of incoming level is determined in tabulation according to BA;
Step b3: the corresponding relation by the frequency planning table obtains the pairing concrete switching target small area of this frequency, the title of record BTS title and sub-district;
Step b4: carry out successively, write down sub-district, front and back and the BTS title switched for N time.
Described step c specifically comprises:
Step c1: establish the GSM-R chain-shaped network as shown in Figure 1, in this BSC control range, have 〉=a N sub-district, if the switch data table of BSC record is shown in the switch data table of table 2 BSC record, after then the traffic direction of train is served as reasons as can be known forward; If the order of switching target small area can judge then that with opposite shown in the table 2 current of traffic is by behind the forward direction.
Table 2
Step c2: according to the traffic direction of train, the neighbor cell that can determine each sub-district in this BSC control range is the sub-district in its traffic direction the place ahead, if after the direction of train operation is served as reasons forward, sub-district C then
NNeighbor cell have only C
N+1If the direction of train operation is by behind the forward direction, then sub-district C
NNeighbor cell have only C
N-1, so just optimized cell list;
Step c3: the adjacent cell list according to after optimizing, carry out handover.
The GSM-R chain-shaped network as shown in Figure 1, the sub-district sequential list example of BSC stored is as shown in table 1, the switch data table example of BSC record is as shown in table 2, the switch decision flow chart is as shown in Figure 2.
Claims (3)
1. method of optimizing GSM-R network handover, it is characterized in that: utilize Abis interface at the BSC place preceding the switching several times to a certain specific user who is in dedicated mode do tracking, N time (N 〉=3) switch the Target cell that this user is switched successively before the record, in its coverage of corresponding BSC stored along network side to the sub-district sequential list judge the traffic direction of train, optimize the handover after carrying out in this BSC control range again behind the cell list.
2. a kind of method of optimizing GSM-R network handover according to claim 1 is characterized in that: for each MS, BSC will carry out following operation when carrying out switching judging:
A, in each MS enters this BSC control range and before carrying out the handoff request first time, the tables of data among the initialization BSC, and in BSC, be stored in its coverage along network side to the sub-district sequential list;
When b, MS carry out handoff request, if the not enough N (N 〉=3) of switching times then carries out conventional handover, and the record data table;
If c switches for the N+1 time, then judge current of traffic according to tables of data, optimize adjacent cell list, carry out again and switch;
D, if switching times greater than N+1, then carries out conventional handover according to the adjacent cell list after optimizing.
3. a kind of method of optimizing GSM-R network handover according to claim 2 is characterized in that:
Described step b comprises:
Step b1: be recorded in BTS title and the place cell name of switching forward direction BSC reporting measurement reports;
Step b2: after the switching, the title of record object sub-district and BTS title;
Step b3: carry out successively, write down sub-district, front and back and the BTS title switched for N time;
Described step c comprises:
Step c1: to the GSM-R chain-shaped network, in this BSC control range, have 〉=a N sub-district, and have the sequential list of these sub-districts in the BSC; The sub-district sequential list that the switch data table and the BSC of comparison BSC record deposited is by the traffic direction of its corresponding relation judgement train;
Step c2: according to the traffic direction of train, can determine the sub-district of the neighbor cell of each sub-district in this BSC control range, optimize cell list for its traffic direction the place ahead;
Step c3: the adjacent cell list according to after optimizing, carry out handover.
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820655A (en) * | 2010-01-04 | 2010-09-01 | 北京交通大学 | RBC soft handoff method in CTCS-3 train control system |
| CN102123461A (en) * | 2011-03-11 | 2011-07-13 | 北京交通大学 | Handover method for global system for mobile communications for railway (GSM-R) based on train function numbers |
| CN102566429A (en) * | 2012-01-09 | 2012-07-11 | 上海交通大学 | Petri network based high speed railway train working permission transmission and analysis system and application |
| CN102655648A (en) * | 2011-03-02 | 2012-09-05 | 鼎桥通信技术有限公司 | User mobility identification method, device and system |
| WO2012129740A1 (en) * | 2011-03-25 | 2012-10-04 | 上海磁浮交通发展有限公司 | Train-ground wireless communication system for rail transportation and handover method between base stations thereof |
| CN102932864A (en) * | 2011-08-09 | 2013-02-13 | 鼎桥通信技术有限公司 | Method for determining running direction of high-speed train and network-side equipment |
| CN103167532A (en) * | 2011-12-16 | 2013-06-19 | 鼎桥通信技术有限公司 | Method for accessing user equipment into neighbourhood and radio network controller |
| CN103874149A (en) * | 2012-12-10 | 2014-06-18 | 索尼公司 | Mobile switching management method, equipment and system in wireless communication network |
| CN104202781A (en) * | 2014-09-17 | 2014-12-10 | 同济大学 | Community speech transmission method for community switching in multimode cellular system |
| CN104904250A (en) * | 2012-11-06 | 2015-09-09 | 发尔泰公司 | Context-aware wireless roaming |
| CN106102108A (en) * | 2016-08-18 | 2016-11-09 | 北京大学深圳研究院 | A kind of intelligent switch method of High Speed Railway Trains wireless access network |
| CN106304215A (en) * | 2016-08-30 | 2017-01-04 | 湖南中车时代通信信号有限公司 | Self adaptation railway private network and the method and system of public network |
| CN108235231A (en) * | 2016-12-19 | 2018-06-29 | 广东新岸线计算机系统芯片有限公司 | Train direction of travel method of discrimination and device in rail traffic |
| CN109462873A (en) * | 2018-11-15 | 2019-03-12 | 武汉虹信通信技术有限责任公司 | A kind of optimization method of communication-based train control system pingpang handoff |
| CN111510974A (en) * | 2020-04-21 | 2020-08-07 | 维沃移动通信有限公司 | Cell reselection method and electronic equipment |
| CN113830138A (en) * | 2020-06-23 | 2021-12-24 | 北京新岸线移动通信技术有限公司 | Method and device for distinguishing train advancing direction in rail transit |
| CN114040460A (en) * | 2021-11-23 | 2022-02-11 | 新华三技术有限公司成都分公司 | Ping-pong switching suppression method and device |
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2009
- 2009-02-10 CN CNA2009100780214A patent/CN101483895A/en active Pending
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| CN101820655A (en) * | 2010-01-04 | 2010-09-01 | 北京交通大学 | RBC soft handoff method in CTCS-3 train control system |
| CN101820655B (en) * | 2010-01-04 | 2013-06-12 | 北京交通大学 | RBC soft handoff method in CTCS-3 train control system |
| CN102655648A (en) * | 2011-03-02 | 2012-09-05 | 鼎桥通信技术有限公司 | User mobility identification method, device and system |
| CN102123461B (en) * | 2011-03-11 | 2013-04-10 | 北京交通大学 | Handover method for global system for mobile communications for railway (GSM-R) based on train function numbers |
| CN102123461A (en) * | 2011-03-11 | 2011-07-13 | 北京交通大学 | Handover method for global system for mobile communications for railway (GSM-R) based on train function numbers |
| WO2012129740A1 (en) * | 2011-03-25 | 2012-10-04 | 上海磁浮交通发展有限公司 | Train-ground wireless communication system for rail transportation and handover method between base stations thereof |
| CN102932864B (en) * | 2011-08-09 | 2016-01-06 | 鼎桥通信技术有限公司 | High ferro travel direction method of discrimination and network equipment |
| CN102932864A (en) * | 2011-08-09 | 2013-02-13 | 鼎桥通信技术有限公司 | Method for determining running direction of high-speed train and network-side equipment |
| CN103167532B (en) * | 2011-12-16 | 2015-09-09 | 鼎桥通信技术有限公司 | The method of subscriber equipment access community and radio network controller |
| CN103167532A (en) * | 2011-12-16 | 2013-06-19 | 鼎桥通信技术有限公司 | Method for accessing user equipment into neighbourhood and radio network controller |
| CN102566429B (en) * | 2012-01-09 | 2013-12-11 | 上海交通大学 | Petri network based high speed railway train working permission transmission and analysis system, and application thereof |
| CN102566429A (en) * | 2012-01-09 | 2012-07-11 | 上海交通大学 | Petri network based high speed railway train working permission transmission and analysis system and application |
| CN104904250B (en) * | 2012-11-06 | 2020-06-19 | 发尔泰公司 | Context aware wireless roaming |
| CN104904250A (en) * | 2012-11-06 | 2015-09-09 | 发尔泰公司 | Context-aware wireless roaming |
| CN103874149A (en) * | 2012-12-10 | 2014-06-18 | 索尼公司 | Mobile switching management method, equipment and system in wireless communication network |
| CN103874149B (en) * | 2012-12-10 | 2020-06-09 | 索尼公司 | Mobile handover management method, equipment and system in wireless communication network |
| US10149223B2 (en) | 2012-12-10 | 2018-12-04 | Sony Corporation | Mobile handover management method, apparatus and system in wireless communication network |
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| CN104202781A (en) * | 2014-09-17 | 2014-12-10 | 同济大学 | Community speech transmission method for community switching in multimode cellular system |
| CN106102108A (en) * | 2016-08-18 | 2016-11-09 | 北京大学深圳研究院 | A kind of intelligent switch method of High Speed Railway Trains wireless access network |
| CN106304215A (en) * | 2016-08-30 | 2017-01-04 | 湖南中车时代通信信号有限公司 | Self adaptation railway private network and the method and system of public network |
| CN108235231A (en) * | 2016-12-19 | 2018-06-29 | 广东新岸线计算机系统芯片有限公司 | Train direction of travel method of discrimination and device in rail traffic |
| CN108235231B (en) * | 2016-12-19 | 2020-09-25 | 广东新岸线科技有限公司 | Method and device for distinguishing train advancing direction in rail transit |
| CN109462873A (en) * | 2018-11-15 | 2019-03-12 | 武汉虹信通信技术有限责任公司 | A kind of optimization method of communication-based train control system pingpang handoff |
| CN109462873B (en) * | 2018-11-15 | 2020-12-01 | 武汉虹信科技发展有限责任公司 | Communication-based train control system ping-pong switching optimization method |
| CN111510974A (en) * | 2020-04-21 | 2020-08-07 | 维沃移动通信有限公司 | Cell reselection method and electronic equipment |
| CN113830138A (en) * | 2020-06-23 | 2021-12-24 | 北京新岸线移动通信技术有限公司 | Method and device for distinguishing train advancing direction in rail transit |
| CN113830138B (en) * | 2020-06-23 | 2023-08-15 | 北京新岸线移动通信技术有限公司 | Method and device for judging train travelling direction in rail transit |
| CN114040460A (en) * | 2021-11-23 | 2022-02-11 | 新华三技术有限公司成都分公司 | Ping-pong switching suppression method and device |
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