CN105578506A - Switching method base on channel information under track traffic high speed moving environment - Google Patents

Switching method base on channel information under track traffic high speed moving environment Download PDF

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Publication number
CN105578506A
CN105578506A CN201510969883.1A CN201510969883A CN105578506A CN 105578506 A CN105578506 A CN 105578506A CN 201510969883 A CN201510969883 A CN 201510969883A CN 105578506 A CN105578506 A CN 105578506A
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train
switching position
base station
distance
prediction switching
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CN105578506B (en
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艾渤
王劲涛
赵越
马国玉
丁建文
何睿斯
官科
王茜
熊磊
钟章队
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Beijing Jiaotong University
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Beijing Jiaotong University
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Abstract

The invention disclose a switching method base on channel information under track traffic high speed moving environment, comprising steps of setting a prediction switching position of a train, calculating the distance between the prediction switching position and a base station to be switched, calculating the path loss of the prediction switching position according to the calculated distance and a channel model corresponding to the prediction switching position, calculating the reception signal field intensity of the reception signal of the train arriving at the prediction switching position according to the path loss, determining whether the field intensity of the signal reception achieves the threshold, if the reception signal field intensity is stronger or equal to the preset threshold, preparing to switch in order to make the train switch to the base station to be switched when the train arrives at the prediction switching position, if the reception signal field intensity is smaller than the preset threshold, repeating the above steps until the received signal field intensity achieves the threshold. The invention can realize the fast, smooth and reliable switching under the high speed movement complex scene.

Description

Based on the changing method of channel information under a kind of track traffic high-speed mobile environment
Technical field
The present invention relates to wireless mobile telecommunication technology field, particularly relate to the changing method based on channel information under a kind of track traffic high-speed mobile environment.
Background technology
Along with railway, subway, inter-city passenger rail, the especially fast development of the Rail Transit System such as high-speed railway, for train passenger provide reliably, in real time, broadband wireless network service efficiently, become the focus of domestic and international wide-band mobile communication research.But the Fast Handoff caused due to high-speed mobile and frequently cell reselection can cause the disconnecting of wireless link, produce call drop and data-transmission interruptions phenomenon, have a strong impact on communication quality and passenger's experience.Especially for for transmitting Train Control information and guaranteeing the Rail Transit System of the video monitoring information that train safe is runed, it is significant that it reliably switches.
Switching refers to be transferred to another base station with the communication link between base station from current base station by the current mobile subscriber carrying out conversing and maintains unbroken process that communicates.
The existing changing method based on level/power, requires there are two primary conditions when switching: the level/power of to be switched community is higher than threshold value; The level of to be switched community is higher than the some decibels of last Cell level/power.This kind of changing method, due to the impact of environmental change or interference, can make the level/power of to be switched community or higher than threshold value, or higher than last Cell level/power, like this, just can not can not produce call drop.
The existing method switched based on quality is because the wireless coverage quality of current area is too poor, therefore, the no matter wireless coverage what state of next switching cell, also carry out force handoff, this just causes cannot ensureing the wireless coverage quality after switching, especially edges cover at all.In addition, translational speed is higher, and the time of passing through overlay region is shorter, when the time that travelling carriage passes through overlay region is less than minimal time delay needed for system process switching, uses the handoff procedure of these class methods to complete, causes call drop.
The switching of the existing positional information based on satellite communication or GPS navigation, at train through high-speed railway such as tunnel or cannot position with the large-scale marshalling yard of canopy, station; Even if employ inertial navigation technology, positioning precision can be poor; If when use such as directly puts relay station as ground communication switch means, except bringing very high expense and maintenance issues, also can bring larger time delay when carrying out satellite or navigation signal is switched to ground network, this also can appreciable impact handover success rate.In addition, this kind of technology judges it is lean on drive test or calculate based on traditional link budget model, low precision for the received field strength of certain position.Therefore, these class methods are also not suitable for applying in the track traffic scenes such as the high-speed railway with high-speed mobile complex scene feature.
Further, existing handoff technique is all the position switched, and namely " switchover trigger point " place just starts to carry out switching judging, initiates the flow processs such as switch decision, easily produces the phenomenon of handoff, and communication quality is difficult to ensure, and it is more to expend time in.
Therefore, research is suitable for quick, the reliable handoff algorithms of high-speed mobile environment, for train control system provides reliable Train Control information, for passenger provides high-quality broadband network services anywhere or anytime, the construction and development for future track traffic system is significant.
Summary of the invention
The object of the present invention is to provide the changing method based on channel information under a kind of track traffic high-speed mobile environment, to realize switching fast, smoothly, reliably under the scene of high-speed mobile.
For achieving the above object, the present invention adopts following technical proposals:
Based on a changing method for channel information under track traffic high-speed mobile environment, comprise the following steps:
The prediction switching position of S1, setting train, and calculate the distance between described prediction switching position and to be switched base station;
S2, according to the described distance that calculates and channel model corresponding to described prediction switching position, calculate the path loss of described prediction switching position;
S3, arrive the Received signal strength field intensity at described prediction switching position place according to described path loss calculation train;
S4, judge whether described Received signal strength field intensity reaches pre-determined threshold;
If S5-1 described Received signal strength field intensity is more than or equal to described pre-determined threshold, then carries out switching and prepare, when reaching described prediction switching position to make train, be switched to described to be switched base station;
If S5-2 described Received signal strength field intensity is less than described pre-determined threshold, then repeat step S1 to step S4, till described Received signal strength field intensity reaches described pre-determined threshold.
Preferably, step S1 comprises:
Obtain the distance D between train and current base station 1;
The distance D between described prediction switching position and to be switched base station is calculated according to following formula (1) 2:
D 2＝D-D 1-D p(1)
Wherein, D is the distance between described current base station and described to be switched base station, D pfor the distance between train and described prediction switching position.
Preferably, after setting described prediction switching position, the distance D between train and described prediction switching position pbetween 100m-500m.
Preferably, the distance D between train and current base station is obtained 1step comprise:
Obtain the distance D between transponder and current base station iD;
Measure the relative distance D of train and described transponder r;
Distance D between train and current base station 1equal D iDwith D rsum.
Preferably, the relative distance D of wheel track stadia surveying train and described transponder is adopted r.
Preferably, in step s 2, described path loss is calculated according to following formula (2):
PL(dB)＝A+Blog 10(D 2)(2)
Wherein, PL (dB) is described path loss, D 2for the distance between described prediction switching position and to be switched base station, when described channel model be respectively overpass, cutting, station, tunnel, city, suburb, rural area and river time, A with B is the preset parameter corresponding with described channel model.
Preferably, in step s 2, described path loss is calculated according to following formula (3):
PL(dB)＝Δ 1+74.52+26.16log 10(f)-13.82log 10(h b)
(3)
-3.2log 10(11.75h m) 2+[44.9-6.55log 10(h b)+Δ 2]log 10(D 2)
Wherein, f is operating frequency, h band h mrepresent the effective depth of described to be switched antenna for base station and the effective depth of train antenna respectively, D 2for the distance between described prediction switching position and to be switched base station, when described channel model be respectively overpass, cutting, station, tunnel, city, suburb, rural area and river time, Δ 1and Δ 2for the preset parameter corresponding with described channel model.
Preferably, in step s3, calculate according to following formula (4) the Received signal strength field intensity that train arrives described prediction switching position place:
P R＝P T-(PL+L BTX+L MRX+F T-G b-G m)(4)
Wherein, P rfor train arrives the Received signal strength field intensity at described prediction switching position place, P tfor the transmitting power of described to be switched base station transmitter, PL is described path loss, L bTXfor the device loss of described to be switched Base Transmitter link, L mRXfor the device loss of train receiver, F tfor retaining total nargin, G band G mrepresent described to be switched bs antenna gain and mobile portable antennas gain respectively.
Preferably, the total nargin F of described reservation tcalculated by following formula (5):
F T＝L SF+L MP+L HM+L IT+L OA+L TC(5)
Wherein, L sFfor shadow fading nargin, L mPfor multipath fading nargin, L hMfor high-speed mobile fade margin, L iTfor interference nargin, L oAfor device aging nargin, L tCfor row control business nargin.
Preferably, described pre-determined threshold is-85dB.
The present invention has following beneficial effect:
The present invention is based on the channel model set up for track traffic scene to predict, the prediction switching position will carrying out switching just can be doped before train arrives " switchover trigger point ", thus make train just prepare switching flow before this prediction switching position of arrival, the more time is reserved to handoff procedure, make realize switching fast, smoothly, reliably under high-speed mobile complex scene, this is of great significance for high-speed mobile environment tool.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is the flow chart of the changing method that the embodiment of the present invention provides;
Fig. 2 is that track traffic Private Mobile Communication Network network chain covers schematic diagram;
Fig. 3 is the flow chart of implementation procedure embodiment illustrated in fig. 2.
Embodiment
In order to be illustrated more clearly in the present invention, below in conjunction with preferred embodiments and drawings, the present invention is described further.Parts similar in accompanying drawing represent with identical Reference numeral.It will be appreciated by those skilled in the art that specifically described content is illustrative and nonrestrictive, should not limit the scope of the invention with this below.
The embodiment provides the changing method based on channel information under a kind of track traffic high-speed mobile environment, as shown in Figure 1, described changing method comprises the following steps:
The prediction switching position of S1, setting train, and calculate the distance between described prediction switching position and to be switched base station;
S2, according to the described distance that calculates and channel model corresponding to described prediction switching position, calculate the path loss of described prediction switching position;
S3, arrive the Received signal strength field intensity at described prediction switching position place according to described path loss calculation train;
S4, judge whether described Received signal strength field intensity reaches pre-determined threshold;
If S5-1 described Received signal strength field intensity is more than or equal to described pre-determined threshold, then carries out switching and prepare, when reaching described prediction switching position to make train, be switched to described to be switched base station;
If S5-2 described Received signal strength field intensity is less than described pre-determined threshold, then repeat step S1 to step S4, till described Received signal strength field intensity reaches described pre-determined threshold.
Here " prediction switching position " refers to the handover trigger position of prediction, and namely train operation carries out base station switching to during this position.The present invention is by predicting the position of handover trigger, and in conjunction with the channel model at described prediction switching position place, accurately can determine the position that train will carry out base station switching in advance, namely switching is triggered when mobile terminal moves to this position, effectively prevent handoff phenomenon, ensure that the communication quality of the next communication cell be switched to.
And, the present invention is in conjunction with track traffic scene and Channel Modeling, by the prediction to train shift position place's field intensity and multipath echo, dope switchover trigger point, namely described prediction switching position is judged, save in existing changing method and just start to carry out neighbor cell level measurement, contrast neighbor cell Field strength coverage situation, select a series of time such as optimum subdistrict, handover trigger judgement when arriving switchover trigger point, such that handover delay is very short, handoff procedure is more level and smooth.
In addition, based on the feature that railway base station chain covers, in forecasting process, only need to predict the field intensity of the next adjacent base station of train, and do not need as existing changing method, need to estimate the field intensity of all communities of travelling carriage periphery and the community selecting field intensity optimum switches.Therefore, method of the present invention can reduce switching time, makes switching faster, is more suitable for high-speed mobile environment.
Preferably, step S1 comprises:
Obtain the distance D between train and current base station 1;
The distance D between described prediction switching position and to be switched base station is calculated according to following formula (1) 2:
D 2＝D-D 1-D p(1)
Wherein, D is the distance between described current base station and described to be switched base station, D pfor the distance between train and described prediction switching position.
Further, the distance D between train and current base station is obtained 1step comprise:
Obtain the distance D between transponder and current base station iD;
Measure the relative distance D of train and described transponder r;
Distance D between train and current base station 1equal D iDwith D rsum.
Preferably, the relative distance D of wheel track stadia surveying train and described transponder is adopted r.
In the present invention, mainly based on the location to train current location that wheel track rangefinder and transponder realize, therefore can not the easy impact being subject to tunnel, shelter as GPS location.Further, owing to have employed transponder, can change with the change of track traffic scene along the line in each position field intensity and predicting the outcome of multipath echo train, flexibility is high.
Preferably, after setting described prediction switching position, the distance D between train and described prediction switching position pbetween 100m-500m.Here by the distance D between train and described prediction switching position pbe defined as " Prediction distance ", usually, Prediction distance is longer, leave for train receiving platform carry out switch prepare time longer, flatness, the accuracy of switching are better, and handoff rate is lower.
As one embodiment of the present invention, in step s 2, the path loss of described prediction switching position is calculated according to following formula (2):
PL(dB)＝A+Blog 10(D 2)(2)
Wherein, PL (dB) is described path loss, D 2for the distance between described prediction switching position and to be switched base station, when described channel model be respectively overpass, cutting, station, tunnel, city, suburb, rural area and river time, A with B is the preset parameter corresponding with described channel model.
Further, in step s 2, described path loss can be calculated by following formula (3):
PL(dB)＝Δ 1+74.52+26.16log 10(f)-13.82log 10(h b)
(3)
-3.2log 10(11.75h m) 2+[44.9-6.55log 10(h b)+Δ 2]log 10(D 2)
Wherein, f is operating frequency, h band h mrepresent the effective depth of described to be switched antenna for base station and the effective depth of train antenna respectively, D 2for the distance between described prediction switching position and to be switched base station, when described channel model be respectively overpass, cutting, station, tunnel, city, suburb, rural area and river time, Δ 1and Δ 2for the preset parameter corresponding with described channel model.The concrete numerical value of above-mentioned preset parameter will provide hereinafter.
Further, in step s3, calculate according to following formula (4) the Received signal strength field intensity that train arrives described prediction switching position place:
P R＝P T-(PL+L BTX+L MRX+F T-G b-G m)(4)
Wherein, P rfor train arrives the Received signal strength field intensity at described prediction switching position place, P tfor the transmitting power of described to be switched base station transmitter, PL is described path loss, L bTXfor the device loss of described to be switched Base Transmitter link, L mRXfor the device loss of train receiver, F tfor retaining total nargin, G band G mrepresent described to be switched bs antenna gain and mobile portable antennas gain respectively.
Wherein, the total nargin F of described reservation tcalculated by following formula (5):
F T＝L SF+L MP+L HM+L IT+L OA+L TC(5)
In formula (5), L sFfor shadow fading nargin, L mPfor multipath fading nargin, L hMfor high-speed mobile fade margin, L iTfor interference nargin, L oAfor device aging nargin, L tCfor row control business nargin.
Preferably, the pre-determined threshold described in the inventive method is-85dB.Namely,-the 85dB that International Union of Railways UIC can be specified in the present invention is as the pre-determined threshold of judgement, if the Received signal strength field intensity at prediction switching position place is more than or equal to described pre-determined threshold, then carry out switching in advance to prepare, when train arrives prediction switching position from physical location, start switching at once, reserve enough switching times to handoff procedure, thus guarantee higher handover success rate.
Below specific embodiment of the invention process is explained in detail.
Fig. 2 is that track traffic Private Mobile Communication Network network chain covers schematic diagram, and wherein, B1 represents current base station, and B2 represents to be switched base station, and P1 represents prediction switching position.Fig. 3 is the flow chart of implementation procedure embodiment illustrated in fig. 2.
First, the current location of train is obtained.The ID of oneself is sent to train by transponder, obtains the distance D between transponder and current base station iD, adopt wheel track rangefinder to draw the relative distance D of train and transponder according to the rotational case of wheel simultaneously r, the distance D so between train and current base station 1formula D can be passed through 1=D iD+ D rdraw.
Based on wheel track rangefinder and transponder, train current location is located, the easy impact being subject to tunnel, shelter unlike GPS location.Further, owing to have employed transponder, can change with the change of track traffic scene along the line in each position field intensity and predicting the outcome of multipath echo train, flexibility is high.
Because rail transit train driving trace is fixing, the base station spacing of its communication network is also fixing, and the distance namely between current base station B1 and to be switched base B2 is D.As mentioned above, P1 represents prediction switching position, and the distance so between train and prediction switching position P1 is D p.Can obtain predicting the distance between switching position P1 and to be switched base station B2, formula (1) namely mentioned above according to the graphics relationship in Fig. 2:
D 2＝D-D 1-D p(1)
Wherein, D ppreferably be arranged between 100m-500m, Prediction distance is longer, leave for train receiving platform carry out switch prepare time longer, flatness, the accuracy of switching are better, and handoff rate is lower.
Afterwards, the channel model predicting that switching position P1 is corresponding is determined, the path loss of computational prediction switching position P1.As mentioned above, can according to the path loss of formula (2) or formula (3) computational prediction switching position P1:
PL(dB)＝A+Blog 10(D 2)(2)
PL(dB)＝Δ 1+74.52+26.16log 10(f)-13.82log 10(h b)
(3)
-3.2log 10(11.75h m) 2+[44.9-6.55log 10(h b)+Δ 2]log 10(D 2)
Wherein, PL (dB) is described path loss, D 2for the distance between prediction switching position P1 and to be switched base station B2, f is operating frequency, h band h mrepresent the effective depth of to be switched antenna for base station and the effective depth of train antenna respectively.
When described channel model be respectively overpass, cutting, station, tunnel, city, suburb, rural area and river time, A and B (or Δ 1and Δ 2) be the preset parameter corresponding with described channel model.Table 1 gives the Δ in formula (3) 1and Δ 2value.
Table 1
Be understandable that, according to the Δ in table 1 1and Δ 2value by arranging formula (3), the corresponding value of A and B in formula (2) can be obtained, repeat no more herein.
Afterwards, carry out wireless link calculating, show that train arrives the Received signal strength field intensity at prediction switching position P1 place.Because down link can, based on the test of broadcast channel BCCH signal, can meet Li Shi sampling criterion calls, therefore the wireless link budget of track traffic Private Mobile Communication Network network be normally based on down link.
As described above, can calculate according to formula (4) the Received signal strength field intensity that train arrives prediction switching position P1 place:
P R＝P T-(PL+L BTX+L MRX+F T-G b-G m)(4)
Wherein, P rfor train arrives the Received signal strength field intensity at described prediction switching position place, P tfor the transmitting power of described to be switched base station transmitter, PL is described path loss, L bTXfor the device loss of described to be switched Base Transmitter link, L mRXfor the device loss of train receiver, F tfor retaining total nargin, G band G mrepresent described to be switched bs antenna gain and mobile portable antennas gain respectively.
The total nargin F of described reservation tformula (5) can be passed through calculate:
F T＝L SF+L MP+L HM+L IT+L OA+L TC(5)
Wherein, L sFfor shadow fading nargin, L mPfor multipath fading nargin, L hMfor high-speed mobile fade margin, L iTfor interference nargin, L oAfor device aging nargin, L tCfor row control business nargin.
Finally, the Received signal strength field intensity P will obtained rcompare with pre-determined threshold, if the Received signal strength field intensity P at prediction switching position P1 place rbe more than or equal to pre-determined threshold, then such as prepare the signaling channel distributed, activation one is new in advance, prepare the traffic channel distributed, activation one is new, prepare the processes such as startup timer.So when train arrives prediction switching position P1 from physical location, start switching at once, reserve enough switching times to handoff procedure, guarantee higher handover success rate.
Here-the 85dB that pre-determined threshold can adopt International Union of Railways UIC to specify.If the Received signal strength field intensity P at prediction switching position P1 place rbe less than pre-determined threshold, then repeatedly setting one prediction switching position, and repeat above-mentioned steps, till the Received signal strength field intensity of the prediction switching position of setting meets switching requirement.
It should be noted that, as shown in Figure 3, before train arrives prediction switching position, also can again set prediction switching position, to realize the switching that speed is faster, quality is higher, more level and smooth.
The feature that the present invention runs on fixing track in conjunction with Rail Transit System, its running orbit is certain, utilizes wheel track rangefinder and transponder accurately to locate train; Recycling train is from current location to the channel model of any position next cell base station running and environmental information, look-ahead goes out to meet the switchover trigger point switching requirement and (namely predicts switching position, and be more than or equal to pre-determined threshold in the Received signal strength field intensity of this position), thus prediction switching position place perform switching, realize in the track traffic scene of high-speed mobile complexity quick, level and smooth, switch reliably.
Obviously; the above embodiment of the present invention is only for example of the present invention is clearly described; and be not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give exhaustive to all execution modes, every belong to technical scheme of the present invention the apparent change of extending out or variation be still in the row of protection scope of the present invention.

Claims (10)

1. under track traffic high-speed mobile environment based on a changing method for channel information, it is characterized in that, comprise the following steps:
The prediction switching position of S1, setting train, and calculate the distance between described prediction switching position and to be switched base station;
S2, according to the described distance that calculates and channel model corresponding to described prediction switching position, calculate the path loss of described prediction switching position;
S3, arrive the Received signal strength field intensity at described prediction switching position place according to described path loss calculation train;
S4, judge whether described Received signal strength field intensity reaches pre-determined threshold;
If S5-1 described Received signal strength field intensity is more than or equal to described pre-determined threshold, then carries out switching and prepare, when reaching described prediction switching position to make train, be switched to described to be switched base station;
If S5-2 described Received signal strength field intensity is less than described pre-determined threshold, then repeat step S1 to step S4, till described Received signal strength field intensity reaches described pre-determined threshold.
2. changing method according to claim 1, is characterized in that, step S1 comprises:
Obtain the distance D between train and current base station 1;
The distance D between described prediction switching position and to be switched base station is calculated according to following formula (1) 2:
D 2＝D-D 1-D p(1)
Wherein, D is the distance between described current base station and described to be switched base station, D pfor the distance between train and described prediction switching position.
3. changing method according to claim 2, is characterized in that, after setting described prediction switching position, and the distance D between train and described prediction switching position pbetween 100m-500m.
4. changing method according to claim 2, is characterized in that, obtains the distance D between train and current base station 1step comprise:
Obtain the distance D between transponder and current base station iD;
Measure the relative distance D of train and described transponder r;
Distance D between train and current base station 1equal D iDwith D rsum.
5. changing method according to claim 4, is characterized in that, adopts the relative distance D of wheel track stadia surveying train and described transponder r.
6. changing method according to claim 1, is characterized in that, in step s 2, calculates described path loss according to following formula (2):
PL(dB)＝A+Blog 10(D 2)(2)
Wherein, PL (dB) is described path loss, D 2for the distance between described prediction switching position and to be switched base station, when described channel model be respectively overpass, cutting, station, tunnel, city, suburb, rural area and river time, A with B is the preset parameter corresponding with described channel model.
7. changing method according to claim 1, is characterized in that, in step s 2, calculates described path loss according to following formula (3):
PL(dB)＝Δ 1+74.52+26.16log 10(f)-13.82log 10(h b)
(3)
-3.2log 10(11.75h m) 2+[44.9-6.55log 10(h b)+Δ 2]log 10(D 2)
Wherein, f is operating frequency, h band h mrepresent the effective depth of described to be switched antenna for base station and the effective depth of train antenna respectively, D 2for the distance between described prediction switching position and to be switched base station, when described channel model be respectively overpass, cutting, station, tunnel, city, suburb, rural area and river time, Δ 1and Δ 2for the preset parameter corresponding with described channel model.
8. changing method according to claim 1, is characterized in that, in step s3, calculates according to following formula (4) the Received signal strength field intensity that train arrives described prediction switching position place:
P R＝P T-(PL+L BTX+L MRX+F T-G b-G m)(4)
Wherein, P rfor train arrives the Received signal strength field intensity at described prediction switching position place, P tfor the transmitting power of described to be switched base station transmitter, PL is described path loss, L bTXfor the device loss of described to be switched Base Transmitter link, L mRXfor the device loss of train receiver, F tfor retaining total nargin, G band G mrepresent described to be switched bs antenna gain and mobile portable antennas gain respectively.
9. changing method according to claim 8, is characterized in that, the total nargin F of described reservation tcalculated by following formula (5):
F T＝L SF+L MP+L HM+L IT+L OA+L TC(5)
Wherein, L sFfor shadow fading nargin, L mPfor multipath fading nargin, L hMfor high-speed mobile fade margin, L iTfor interference nargin, L oAfor device aging nargin, L tCfor row control business nargin.
10. changing method as claimed in any of claims 1 to 9, is characterized in that, described pre-determined threshold is-85dB.
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CN106792944A (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
CN107995663A (en) * 2016-10-26 2018-05-04 韩国电子通信研究院 Switching determines method and device
CN108616803A (en) * 2016-12-21 2018-10-02 中国移动通信集团湖北有限公司 The localization method and device of high ferro user
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CN109905147A (en) * 2019-03-19 2019-06-18 深圳市元征科技股份有限公司 A kind of vehicle-mounted unmanned aerial vehicle communication means and system
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CN107995663A (en) * 2016-10-26 2018-05-04 韩国电子通信研究院 Switching determines method and device
CN108616803A (en) * 2016-12-21 2018-10-02 中国移动通信集团湖北有限公司 The localization method and device of high ferro user
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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
CN106792944B (en) * 2016-12-30 2019-10-15 广东海格怡创科技有限公司 High-speed rail private network cell switches point detecting method and system
CN108832985A (en) * 2018-05-02 2018-11-16 中国人民解放军32039部队 Mobile IP communication system and method for repeater satellite Incorporate network
CN111200788A (en) * 2018-11-16 2020-05-26 大众汽车有限公司 Method, device, vehicle and core network management equipment for implementing switching process
CN111200788B (en) * 2018-11-16 2021-10-15 大众汽车有限公司 Method, device, vehicle and core network management equipment for implementing switching process
CN111356193A (en) * 2018-12-24 2020-06-30 海能达通信股份有限公司 Terminal handover method and communication terminal
CN109905147A (en) * 2019-03-19 2019-06-18 深圳市元征科技股份有限公司 A kind of vehicle-mounted unmanned aerial vehicle communication means and system
CN109905147B (en) * 2019-03-19 2021-06-15 深圳市元征科技股份有限公司 Vehicle-mounted unmanned aerial vehicle communication method and system
CN113271566A (en) * 2021-04-06 2021-08-17 电子科技大学 Method and device for detecting communication field intensity time slot of high-speed maglev train
CN114339792A (en) * 2021-12-31 2022-04-12 浙江大学 Rapid switching method and system for LTE-M pre-bearing communication system of rail transit

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