CN109104750A - A kind of LTE-R method of handover based on speed triggering - Google Patents
A kind of LTE-R method of handover based on speed triggering Download PDFInfo
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- CN109104750A CN109104750A CN201810984187.1A CN201810984187A CN109104750A CN 109104750 A CN109104750 A CN 109104750A CN 201810984187 A CN201810984187 A CN 201810984187A CN 109104750 A CN109104750 A CN 109104750A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 30
- 230000004913 activation Effects 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 3
- 238000012986 modification Methods 0.000 claims description 3
- 230000007420 reactivation Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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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
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
-
- 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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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention relates to a kind of LTE-R method of handover based on speed triggering, belong to wireless communication handoff techniques field.The measurement report that the present invention is uploaded by train mobile terminal compares the Reference Signal Received Power of Target cell and serving cell to decide whether triggering switching；Next, train present speed is compared with the speed threshold value of setting, to decide whether to start fast handover procedure, not up to speed threshold value just runs conventional changeover program；Finally, the time that the train being calculated must be reached to switching reference point is compared with the time gate limit value of setting if court verdict is operation fast handover procedure, next measurement report is waited to switch over again if the time is less than time gate limit value.This hair solve the prior art to LTE-R handover not in time, phenomena such as success rate is not high, increase train in the validity and success rate of handover between cells.
Description
Technical field
The present invention relates to a kind of LTE-R method of handover based on speed triggering, belong to wireless communication and get over area and cut
Change technical field.
Background technique
When train high-speed cruising on rail, due to excessive velocities will lead to signal in handover between cells showing not in time
As occurring, therefore train quickly and efficiently can carry out signal switching in minizone, and in terms of improving
Research is of great significance.
Currently, the handover for train on rail, traditional algorithm is using the joint based on RSRP and RSRQ
Decision algorithm can avoid to a certain extent frequent switching and cutting off rate excessively high in this way；But when train is run with friction speed
It is still made decisions using the identical sluggish and trigger delay time, is easy for causing switching too early or both of these case goes out too late
It is existing.
The optimization algorithm of the handoff parameter based on movement speed characteristic is had also been proposed later, although this solves train not
With the switching problem under speed, but its measurement report uploaded can reduce the accuracy of switch decision, therefore still have much room for improvement, and mention
A kind of handoff algorithms rapidly and efficiently are a problem to be solved out.
Summary of the invention
The technical problem to be solved by the present invention is to be directed to the limitation and deficiency of the prior art, provide a kind of based on speed triggering
LTE-R method of handover, with solve the prior art to LTE-R handover not in time, success rate is not high phenomena such as, endeavour
Increase train in the validity and success rate of handover between cells in carrying out Pre-handoff after making decisions to train speed.
The technical scheme is that a kind of LTE-R method of handover based on speed triggering, mobile eventually by train
The measurement report uploaded is held, compares the Reference Signal Received Power of Target cell and serving cell to decide whether that triggering is cut
It changes；Next, train present speed is compared with the speed threshold value of setting, to decide whether that starting is switched fast journey
Sequence, not up to speed threshold value just run conventional changeover program；Finally, if court verdict is operation fast handover procedure, it must
The time that the train being calculated reaches switching reference point is compared with the time gate limit value of setting, if the time is less than the time
Threshold value then waits next measurement report to switch over again；
Specific steps are as follows:
Step1: place when switching over to train carries out a large amount of measurement statistics, obtains the switching reference of an estimation
Point P (x1,y1), whether start for train and be switched fast algorithm one speed threshold V_threshold of setting, to be confirmed whether to swash
A switching time thresholding T_threshold is arranged in Target cell channel living；
Wireless base station eNodeB in Step2:LTE network initiates modification measurement to train mobile terminal UE, measures train
Speed V, direction D, the position coordinates Q (x of current location2,y2), serving cell Reference Signal Received Power thresholding RSRPS, A3 thing
Part triggers hysteresis factors H, Target cell Reference Signal Received Power thresholding RSRPT；The wherein calculation of serving cell RSRP
Such as formula (1), P in formula (1)RSIt is the mean receiving power for carrying each resource particle of reference signal, PnoiseIt is carrying with reference to letter
Number each resource particle average noise power；
RSRP=PRS-Pnoise (1)
Step3: when the measurement report that train mobile terminal UE measurement obtains meets reporting conditions, measurement report is uploaded to
Wireless base station eNodeB in LTE network；
Step4: judging whether the Reference Signal Received Power of serving cell and Target cell meets formula (2) condition,
Under the conditions of "Yes", triggering switching；Conversely, turning again to measurement report；
RSRPT > RSRPS+H (2)
Step5: under conditions of meeting formula (2), judging whether Target cell channel has activated, and sends switching if activation
Order；If un-activation, conventional changeover program is run；
Step6: train present speed V is compared with the speed threshold V_threshold of setting, if train speed V
Greater than speed threshold V_threshold, then starting is switched fast algorithm；Conversely, running conventional changeover program；
Step7: train is calculated to the distance S of switching reference point, such as formula (3), and obtains estimating switching time T, such as formula
(4)；
Step8: comparing estimation switching time T and switching time thresholding T_threshold size, if estimation switching time T
Greater than the switching time thresholding T_threshold of setting, then activation Target cell channel is confirmed；Conversely, then waiting next survey
Amount report, completes handoff procedure.
Further, in the Step1 and Step2, GPS system need to be installed to train, mobile station could be by train position
Network is reported to measurement report with velocity information.
Further, in the Step2, current of traffic D is judged according to train number number.
Further, in the Step2, it is current service cell and consecutive target cell that A3 event, which triggers hysteresis factors H,
Reference Signal Received Power RSRP difference, which can and sets itself different according to communication environment.
Further, in the Step5, conventional changeover program refers to train reactivation mesh after having carried out handover trigger
Mark cell channel.
Further, in the Step6, be switched fast algorithm refer to it is just complete to Target cell channel before handover trigger
At activation, i.e., according to train running speed, direction, position, just fulfil target ahead of schedule when train does not enter 2 cell overlapping region
The distribution and activation of cell channel.
Further, in the Step6, setting switch speed thresholding V_threshold for high-speed mobile train and
Speech will will start during switching execution and be switched fast algorithm, and train operation distance can significantly reduce, and can reduce cut in this way
It changes failure rate, improve call reliability.
Further, in the Step8, setting switching time thresholding T_threshold is in order to prevent in the switching time limit
It is interior, if the appearance for the case where not completing switching and causing network congestion.
The beneficial effects of the present invention are: solve the prior art to LTE-R handover not in time, success rate it is not high existing
As increasing train in the validity and success rate of handover between cells.
Detailed description of the invention
Fig. 1 is flow diagram of the present invention；
Fig. 2 is handover procedure schematic diagram of the present invention.
Specific embodiment
With reference to the accompanying drawings and detailed description, the invention will be further described.
Embodiment 1: as shown in Figs. 1-2, a kind of LTE-R method of handover based on speed triggering is mobile by train
The measurement report that terminal uploads compares the Reference Signal Received Power of Target cell and serving cell to decide whether that triggering is cut
It changes；Next, train present speed is compared with the speed threshold value of setting, to decide whether that starting is switched fast journey
Sequence, not up to speed threshold value just run conventional changeover program；Finally, if court verdict is operation fast handover procedure, it must
The time that the train being calculated reaches switching reference point is compared with the time gate limit value of setting, if the time is less than the time
Threshold value then waits next measurement report to switch over again；
Specific steps are as follows:
Step1: place when switching over to train carries out a large amount of measurement statistics, obtains the switching reference of an estimation
Point P (x1,y1), whether start for train and be switched fast algorithm one speed threshold V_threshold of setting, to be confirmed whether to swash
A switching time thresholding T_threshold is arranged in Target cell channel living；
Wireless base station eNodeB in Step2:LTE network initiates modification measurement to train mobile terminal UE, measures train
Speed V, direction D, the position coordinates Q (x of current location2,y2), serving cell Reference Signal Received Power thresholding RSRPS, A3 thing
Part triggers hysteresis factors H, Target cell Reference Signal Received Power thresholding RSRPT；The wherein calculation of serving cell RSRP
Such as formula (1), P in formula (1)RSIt is the mean receiving power for carrying each resource particle of reference signal, PnoiseIt is carrying with reference to letter
Number each resource particle average noise power；
RSRP=PRS-Pnoise (1)
Step3: when the measurement report that train mobile terminal UE measurement obtains meets reporting conditions, measurement report is uploaded to
Wireless base station eNodeB in LTE network；
Step4: judging whether the Reference Signal Received Power of serving cell and Target cell meets formula (2) condition,
Under the conditions of "Yes", triggering switching；Conversely, turning again to measurement report；
RSRPT > RSRPS+H (2)
Step5: under conditions of meeting formula (2), judging whether Target cell channel has activated, and sends switching if activation
Order；If un-activation, conventional changeover program is run；
Step6: train present speed V is compared with the speed threshold V_threshold of setting, if train speed V
Greater than speed threshold V_threshold, then starting is switched fast algorithm；Conversely, running conventional changeover program；
Step7: train is calculated to the distance S of switching reference point, such as formula (3), and obtains estimating switching time T, such as formula
(4)；
Step8: comparing estimation switching time T and switching time thresholding T_threshold size, if estimation switching time T
Greater than the switching time thresholding T_threshold of setting, then activation Target cell channel is confirmed；Conversely, then waiting next survey
Amount report, completes handoff procedure.
Further, in the Step1 and Step2, GPS system need to be installed to train, mobile station could be by train position
Network is reported to measurement report with velocity information.
Further, in the Step2, current of traffic D is judged according to train number number.
Further, in the Step2, it is current service cell and consecutive target cell that A3 event, which triggers hysteresis factors H,
Reference Signal Received Power RSRP difference, which can and sets itself different according to communication environment.
Further, in the Step5, conventional changeover program refers to train reactivation mesh after having carried out handover trigger
Mark cell channel.
Further, in the Step6, be switched fast algorithm refer to it is just complete to Target cell channel before handover trigger
At activation, i.e., according to train running speed, direction, position, just fulfil target ahead of schedule when train does not enter 2 cell overlapping region
The distribution and activation of cell channel.
Further, in the Step6, setting switch speed thresholding V_threshold for high-speed mobile train and
Speech will will start during switching execution and be switched fast algorithm, and train operation distance can significantly reduce, and can reduce cut in this way
It changes failure rate, improve call reliability.
Further, in the Step8, setting switching time thresholding T_threshold is in order to prevent in the switching time limit
It is interior, if the appearance for the case where not completing switching and causing network congestion.
In conjunction with attached drawing, the embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned
Embodiment within the knowledge of a person skilled in the art can also be before not departing from present inventive concept
Put that various changes can be made.
Claims (6)
1. a kind of LTE-R method of handover based on speed triggering, it is characterised in that: the survey uploaded by train mobile terminal
Amount report compares the Reference Signal Received Power of Target cell and serving cell to decide whether triggering switching；Next, will
Train present speed is compared with the speed threshold value of setting, to decide whether to start fast handover procedure, not up to speed
Threshold value just runs conventional changeover program；Finally, if court verdict is operation fast handover procedure, the column that must will be calculated
The time that vehicle reaches switching reference point is compared with the time gate limit value of setting, under waiting if the time is less than time gate limit value
One measurement report switches over again；
Specific steps are as follows:
Step1: place when switching over to train measures statistics, obtains the switching reference point P (x of an estimation1,y1),
Whether start for train and be switched fast algorithm one speed threshold V_threshold of setting, to be confirmed whether to activate Target cell
A switching time thresholding T_threshold is arranged in channel；
Wireless base station eNodeB in Step2:LTE network initiates modification measurement to train mobile terminal UE, and measurement train is current
Speed V, direction D, the position coordinates Q (x of position2,y2), serving cell Reference Signal Received Power thresholding RSRPS, A3 event touching
Send out hysteresis factors H, Target cell Reference Signal Received Power thresholding RSRPT；The wherein calculation of serving cell RSRP such as formula
(1), P in formula (1)RSIt is the mean receiving power for carrying each resource particle of reference signal, PnoiseIt is carrying reference signal
The average noise power of each resource particle；
RSRP=PRS-Pnoise (1)
Step3: when the measurement report that train mobile terminal UE measurement obtains meets reporting conditions, measurement report is uploaded to LTE
Wireless base station eNodeB in network；
Step4: judging whether the Reference Signal Received Power of serving cell and Target cell meets formula (2) condition, in "Yes" item
Under part, triggering switching；Conversely, turning again to measurement report；
RSRPT > RSRPS+H (2)
Step5: under conditions of meeting formula (2), judging whether Target cell channel has activated, and switching life is sent if activation
It enables；If un-activation, conventional changeover program is run；
Step6: train present speed V is compared with the speed threshold V_threshold of setting, if train speed V is greater than
Speed threshold V_threshold, then starting is switched fast algorithm；Conversely, running conventional changeover program；
Step7: train is calculated to the distance S of switching reference point, such as formula (3), and obtains estimating switching time T, such as formula (4)；
Step8: comparing estimation switching time T and switching time thresholding T_threshold size, if estimation switching time T is greater than
The switching time thresholding T_threshold of setting then confirms activation Target cell channel；Conversely, next measurement is then waited to report
It accuses, completes handoff procedure.
2. the LTE-R method of handover according to claim 1 based on speed triggering, it is characterised in that: the Step1
In Step2, GPS system need to be installed to train, train position and velocity information could be reported to by mobile station with measurement report
Network.
3. the LTE-R method of handover according to claim 1 based on speed triggering, it is characterised in that: the Step2
In, current of traffic D is judged according to train number number.
4. the LTE-R method of handover according to claim 1 based on speed triggering, it is characterised in that: the Step2
In, A3 event triggering hysteresis factors H is the difference of the Reference Signal Received Power RSRP of current service cell and consecutive target cell
Value.
5. the LTE-R method of handover according to claim 1 based on speed triggering, it is characterised in that: the Step5
In, conventional changeover program refers to train reactivation Target cell channel after having carried out handover trigger.
6. the LTE-R method of handover according to claim 1 based on speed triggering, it is characterised in that: the Step6
In, be switched fast algorithm and refer to before handover trigger and just Target cell channel is completed to activate, i.e., according to train running speed,
Direction, position just fulfil the distribution and activation of Target cell channel ahead of schedule when train does not enter 2 cell overlapping region.
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Cited By (5)
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| CN111277975A (en) * | 2020-01-15 | 2020-06-12 | 北京锦鸿希电信息技术股份有限公司 | GSM-R handover switching method and device |
| CN111526481A (en) * | 2019-02-05 | 2020-08-11 | 丰田自动车株式会社 | Vehicle-mounted communication device, communication method, and server device |
| WO2020192763A1 (en) * | 2019-03-27 | 2020-10-01 | 华为技术有限公司 | Method and device for measuring reference signal |
| CN113133068A (en) * | 2019-12-31 | 2021-07-16 | 中国移动通信集团浙江有限公司 | Same-frequency switching method and device for endangered electric quantity terminal |
| CN115915314A (en) * | 2022-11-04 | 2023-04-04 | 苏州大学 | High-speed rail mobile communication network handover parameter self-adaption method and device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111526481A (en) * | 2019-02-05 | 2020-08-11 | 丰田自动车株式会社 | Vehicle-mounted communication device, communication method, and server device |
| WO2020192763A1 (en) * | 2019-03-27 | 2020-10-01 | 华为技术有限公司 | Method and device for measuring reference signal |
| CN113133068A (en) * | 2019-12-31 | 2021-07-16 | 中国移动通信集团浙江有限公司 | Same-frequency switching method and device for endangered electric quantity terminal |
| CN113133068B (en) * | 2019-12-31 | 2022-06-14 | 中国移动通信集团浙江有限公司 | Same-frequency switching method and device for endangered electric quantity terminal |
| CN111277975A (en) * | 2020-01-15 | 2020-06-12 | 北京锦鸿希电信息技术股份有限公司 | GSM-R handover switching method and device |
| CN111277975B (en) * | 2020-01-15 | 2022-08-26 | 北京锦鸿希电信息技术股份有限公司 | GSM-R handover switching method and device |
| CN115915314A (en) * | 2022-11-04 | 2023-04-04 | 苏州大学 | High-speed rail mobile communication network handover parameter self-adaption method and device |
| CN115915314B (en) * | 2022-11-04 | 2024-02-09 | 苏州大学 | High dynamic mobile communication network handover parameter self-adapting method and device |
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