CN107995663A - Switching determines method and device - Google Patents
Switching determines method and device Download PDFInfo
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- CN107995663A CN107995663A CN201711019220.9A CN201711019220A CN107995663A CN 107995663 A CN107995663 A CN 107995663A CN 201711019220 A CN201711019220 A CN 201711019220A CN 107995663 A CN107995663 A CN 107995663A
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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
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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
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Disclose a kind of switching and determine method and device.One embodiment, its step include：The cell residence time based on moving body, selection target base station, and power is received based on reference symbol, start to switch to the target BS.
Description
Technical field
Following embodiments are related to switching and determine method and device.
Background technology
Long Term Evolution (Long Term Evolution；LTE) network is divided into LET parts and evolution block core
(Evolved Packet Core；EPC) part.LTE parts are related to wireless access network (E-UTRAN) correlation technology, EPC parts
It is related to core (core) net correlation technology.LTE network reference model includes LTE entities and EPC entities.
In LTE entities, node B (the evolved Node B of evolution；ENB) when particular event occurs, order terminal is led to
Cross measurement configuration information (Measurement Configuration message), report received signal strength.Measuring configuration is believed
Breath is included in RRC access reconfiguration messages (wireless heterogeneous networks (Radio Resource Control；RRC)Connection
Reconfiguration message) it is communicated.The terminal of serving BS and adjacent base station received signal strength is measured, is received
When configuring message (configuration message), pass through measurement report message (Measurement Report
Message) the signal strength of report measurement.For eNB based on this message, the eNB that sets the goal performs switching.
The content of the invention
Technical task
Embodiment can provide the technology for the target BS for being selected to serving BS switching object.
Embodiment can provide the technology for preventing serving BS frequent switching.
Embodiment can provide serving BS and start switching with target BS, calculate the technology of time.
In addition, embodiment can provide the technology for improving serving BS handover success rate.
Technical solution
According to one embodiment, switch the method for determining, its step may include：The cell residence time based on moving body
(cell residence time (CRT)), selection target base station, and power (Reference is received based on reference symbol
Symbol Received Power (RSRP)), start to switch to the target BS.
The step of beginning, may include：When the reference symbol reception power is less than critical value, calculates and be used for described
The triggered time of target BS triggering switching, and the switching is started based on the triggered time.
Selected step may include：For multiple adjacent base stations, the cell residence time is calculated, and it is described more
In a base station, by the cell residence time longest base station, target BS described in selected as.
The critical value can be the switch threshold value through 3GPP LTE HO Event A2.
The step of starting the switching based on the triggered time may include：The reference symbol receives power from critical value
By the triggered time, then start the switching.
The calculation procedure may include：Use switch threshold value, Radio Link Failure (radio link failure
(RLF)), switch it is at least one in time and path loss model (path loss model), when calculating the triggering
Between.
Determine the switching determining device of base station switching, may include according to the switching determining device of one embodiment：Controller,
Cell residence time selection target base station based on moving body, receives power based on reference symbol, is opened to the target BS
Begin to switch.
The controller calculates when the reference symbol receives power and is less than critical value and is used to touch to the target BS
The triggered time of switching is sent out, the switching can be started based on the triggered time.
The controller calculates the cell residence time to serving BS and multiple adjacent base stations, by the multiple base
The longest base station of cell residence time described in standing, may be selected to be the target BS.
The critical value can be the switch threshold value through 3GPP LTE HO Event A2.
The reference symbol receives power and passes through the triggered time from critical value, and the controller can start described cut
Change.
The controller is accurate using switch threshold value, Radio Link Failure (radio link failure (RLF)), switching
It is at least one in standby time and path loss model (path loss model), calculate the triggered time.
Brief description of the drawings
Fig. 1 is to show that explanation switching determines an example of system.
Fig. 2 is the general configuration figure for showing the switching determining device according to one embodiment.
Fig. 3 is an example for showing explanation computing unit lattice residence time method.
Fig. 4 is the distance shown according to moving body, and display reference symbol receives the chart of watt level change.
Fig. 5 is to show that explanation calculates an example of triggered time method.
Fig. 6 is to show that explanation determines an example of the action of switching in the switching determining device shown in Fig. 2.
Fig. 7 is to show that explanation switching determines an exemplary precedence diagram of method.
Fig. 8 is the example shown for evaluating switching determining device performance graph.
Fig. 9 is other examples shown for evaluating switching determining device performance graph.
Embodiment
It is in the embodiment to concept of the present invention of this disclosure, specific structure or technical ability explanation, its purpose
The embodiment of example, according to the present invention concept for the embodiment for illustrating concept of the present invention, can be implemented by variform, and not
It is defined in the embodiment illustrated in this specification.
The embodiment of concept according to the present invention, can add various change, and can add variform, so, it will implement to show
Go out in example, be described in detail in this specification.But this embodiment for not limiting concept according to the present invention is specifically disclosed
Form, and it is included in the thought of the present invention and change, the equipollent of technical scope, or substitute.
First or second grade term can be used to illustrate a variety of inscapes, but the inscape be not limited to it is described
Term.The term is the purpose an inscape to be distinguished from other inscapes, for example, not departing from from the present invention
The interest field of concept, the first inscape can be named as the second inscape, and similarly the second inscape can also be ordered
Entitled first inscape.
It is appreciated that some inscapes are mentioned " connection " or " access " in other inscapes, can directly connect
Connect or access in other inscapes, but other inscapes also may be present in centre.
, can be with the contrary, some inscapes are mentioned " being directly connected to " or " being directly accessed " in other inscapes
It is interpreted as middle and other inscapes is not present.Illustrate the term of relation between inscape, such as "~between " and " just~
Between ", or " direct neighbor~" etc., also explained in the same manner.The term used in this specification is simply to illustrate that specific
Embodiment and use, so being not intended to define the intention of embodiment.The performance of odd number except clearly specifying it in terms of content
Outside, including plural number shows.In the present specification, the term such as " comprising " or " having " is understood to, and is specified described in specification
Feature, numeral, step, operation, inscape, component either these combination presence rather than in advance exclude one or
Other features more than it either numeral, step, operation, inscape, component either presence of these combinations or it is additional can
Can property.
Except being in addition defined, all terms used herein including technology or scientific words are led with the present invention
The technical staff in domain is commonly understood by having the identical meaning.The term being defined in advance used in general is parsed into and related skill
Art has the meaning equivalent in meaning, and except not defined clearly in this specification, it is impossible to is construed to preferably or excessively
The meaning of form.
Hereinafter, embodiment is described in detail in refer to the attached drawing.But the scope of patent application is not limited or is defined in
These embodiments.Identical component is shown in the same reference numeral respectively illustrated.
It may imply that what is illustrated in this specification in the module (module) of this specification, function can perform according to each title
With the hardware of action, the computer program code of executable specific function and action also mean that, or may imply that carrying can
The electronic record medium of the computer program code of specific function and action is performed, for example, processor or microprocessor.
That is, module may imply that hardware for performing the technology of the present invention thought and/or described hard for driving
The function and/or structure of the software of part combine.
Fig. 1 is to show that explanation switching determines an example of system.
With reference to figure 1, switch and determine that system 10 may include moving body 100 and multiple base stations 200,210-1 and 210-2.In addition,
Switching determines that system 10 may also include switching determining device 300.
Moving body 100 can communicate with one in multiple base stations 200,210-1 and 210-2.For example, moving body 100
And multiple base station 200,210-1 and 210-2, it can be performed and be in communication with each other by each antenna.That is, moving body 100 and multiple base stations
200th, 210-1 and 210-2 may include antenna.
Multiple base station 200,210-1 and 210-2 may include serving BS 200 and adjacent base station 210-1 and 210-2.It is adjacent
Base station 210-1 and 210-2 include the first adjacent base station 210-1 and the second adjacent base station 210-2, can be and serving BS 200
Adjacent base station.
Multiple base station 200,210-1 and 210-2 can be designed by dual net, be densely aligned.Multiple base stations 200,
210-1 and 210-2 provides service with single-frequency, so, it may be desired to cover dual.Multiple base station 200,210-1 and 210-2
Interval be densely aligned, the covering of the cell of base station 200,210-1 and 210-2 can be overlapping.In this regard, base station is for example in base
200 are stood when breaking down, instead of the base station 200 of failure, the base station 210-1 or 210-2 on periphery can provide service.
LTE protocol can be used in moving body 100 and multiple base stations 200,210-1 and 210-2.In this case, Duo Geji
The 200,210-1 and 210-2 that stands can become the main body operation of switching.
In addition, unlicensed band (un-license can be used in moving body 100 and multiple base stations 200,210-1 and 210-2
) and/or licensed band (license band) band.For example, licensed band can be the LTE railway networks.Licensed band is not because having
Ambient signal disturbs, and switching determining device 300 can calculate the distance and speed of moving body 100 based on signal strength.
Moving body 100 can move on by fixed path.For example, moving body 100 is train, it is railway by fixed path.
When moving body 100 is with high-speed mobile, moving body rests on the time of the cell Covering domain of base station 200,210-1 or 210-2
(cell residence time) is short, and multiple base station 200,210-1 and 210-2 may frequently perform switching.For example, moving body 100 with
350km/h is moved, and when the cell Covering domain of multiple base stations 200,210-1 and 210-2 is 5km radiuses, serving BS 200 is every
Executable switching in 50 seconds.
Show that switching determining device 300 is embodied in the outside of multiple base stations 200,210-1 and 210-2 in Fig. 1, but not
This is necessarily defined in, switching determining device 300 can be embodied in the inside of multiple base stations 200,210-1 and 210-2.
Switching determining device 300 may be selected in multiple adjacent base station 210-1 and 210-2, become the target base of switching object
Stand.In such cases, switching determining device 300 is based on the cell residence time (cellresidence time (CRT)), can
Selection target base station.
For example, the cell residence time for the moving body 100 of the first adjacent base station 210-1 is C1, for the second phase
The cell residence time of the moving body 100 of adjacent base station 210-2 can be C2.Stop in the cell of the second adjacent base station 210-2
When staying the time C2 to be longer than the cell residence time C1 of the first adjacent base station 210-1, switching determining device 300 can be by moving body
100 cell residence time longest second adjacent base station 210-2 selected as target BS.That is, target BS can be with
Moving body 100 is apart from farthest base station.
In addition, switching determining device 300 is using the handoff algorithms based on 3GPP LTE HO Event A1 to A6.Example
Such as, switch determining device 300 and utilize the handoff algorithms based on 3GPP LTE HO Event A2, the profit that moving body 100 can be maximum
With the resource of target BS., can be such as table 1 based on the handoff algorithms of 3GPP LTE HO Event A1 to A6.
Switching determine method 300 when the signal strength of serving BS 200 is less than critical value, can make serving BS 200 to
Target BS 210-2 switchover operations trigger.The signal strength of serving BS 200 can receive power by reference symbol
(Reference Symbol Received Power；RSRP) show.
Switch determining device 300 and be based on reference symbol reception power, can calculate will switch the triggered time for being used for triggering.
Switch determining device 300 and adjust the triggered time, can prevent late handoff failure (late handover failure).
When late handoff failure is that the translational speed of moving body 100 is too fast, reference symbol receives power ratio handover parameter values rapid decay
Phenomenon.In this regard, Radio Link Failure (radio link failure can occur for moving body 100；RLF).Switch determining device 300
The adjustment triggered time prevents Radio Link Failure, can improve the handover success rate of serving BS 200.
By this, switching determining device 300 can reduce unnecessary switching times.
Fig. 2 is the general configuration figure for showing the switching determining device according to one embodiment.
Referring to figs. 1 to Fig. 2, switching determining device 300 may include controller 310.Controller 310 may include selecting module
311 and switching determining module 313.
Selecting module 311 calculates the cell residence time of moving body 100, based on the cell residence time, may be selected more
Target BS 210-2 in a adjacent base station 210-1 and 210-2.
Switch determining module 313 and calculate the triggered time for being used for triggering switching, can start to switch based on the triggered time.
Hereinafter, with reference to figure 3 to Fig. 5, controller 310, for example, selecting module 311 and switching 313 selection target of determining module
Base station 210-2, for being determined to perform the action of the initial point switched by target BS 210-2, reference chart illustrates.
Fig. 3 is an example for showing explanation computing unit lattice residence time method.
With reference to figure 3, moving body 100 is in the communication range of adjacent base station 210, can be with adjacent base as path 900 is moved
Stand and 210 communicate.
Selecting module 311 can calculate the cell residence time of moving body 100.The cell residence time of moving body 100,
It can be the time that moving body 100 rests on stop field, the i.e. cell 800 of adjacent base station 210.Cell 800 can be
In the communication range of adjacent base station 210, the reference symbol of moving body 100 receives power and is based on 3GPP LTE HO Event A2
Switch threshold value more than field.
That is, selecting module 311 calculates d in 100 mobile unit lattice 800 of moving bodywrApart from the required time, movement can be calculated
The cell residence time of body 100.
Translational speed of the selecting module 311 based on moving body 100, can calculate the cell residence time of moving body 100.Example
Such as, selecting module 311 uses mathematical expression 1, can calculate the cell residence time of moving body 100.
【Mathematical expression 1】
Wherein, CiIt is the cell residence time in i-th of adjacent base station of moving body 100, dwrIt is that reference symbol receives
Field more than switch threshold value of the power based on 3GPP LTE HO Event A2, v can be the mobile speed of moving body 100
Degree.
The reference symbol of moving body 100, which receives power, can follow path loss model.It is strong that path loss model includes signal
Attenuance component is spent, signal intensity attenuation component may include that large scale fading (large scale fading) and/or small scale decline
Subtract.Large scale fading is the signal intensity attenuation component according to distance, and small scale decay can be through shade in same distance
(shadowing) and noise (noise) change (fluctuate) into sub-element.According to the movement with 210 distance of adjacent base station
The path loss model (path loss mode) of body 100 can be such as mathematical expression 2.
【Mathematical expression 2】
Pr=PT-(PLo+10n log10(d)+X(σ))
Wherein, PrIt is that power, P are received according to the reference symbol of 210 distance of moving body 100 and adjacent base stationTIt is adjacent base station
210 transmission electric power, PLoIt is constant loss amount (constant loss), d is the antenna and moving body 100 of adjacent base station 210
Antenna between distance, X (σ) can be standard deviation be σ small scale decay (small scale fading).
Selecting module 311 is based on path consume model, can calculate between 100 antenna of 210 antenna of adjacent base station and moving body
Distance.Specifically, mathematical expression 2 can be showed again by mathematical expression 3.
【Mathematical expression 3】
Wherein, d (t1) it is t at any time1The distance between, 100 antenna of i-th of neighbouring base station antennas and moving body,
PTiIt is the transmission electric power of i-th of adjacent base station, PR, i(t1) can be t at any time1, the transmission electricity of i-th of adjacent base station
Power.The transmission electric power of i-th of adjacent base station considers the influence of landform and atural object, the interference effect formed according to dual etc., can
It is arranged differently than in each base station.
Selecting module 311 is based on mathematical expression 4, can calculate distance dwrThe d of general distancehr.In this case, mould is selected
D (the t that block 311 will can be calculated in mathematical expression 31) it is updated to mathematical expression 4.
【Mathematical expression 4】
Wherein, drIt is the beeline of 100 antenna of 210 antenna of adjacent base station and moving body, htIt is 210 antenna of adjacent base station
Height, hrIt is the height of 100 antenna of moving body, dsIt can be the beeline between adjacent base station 210 and path 900.
Selecting module 311 can calculate distance d based on mathematical expression 5hr.Mathematical expression 5 can be exported from mathematical expression 3 and mathematical expression 4.
【Mathematical expression 5】
Selecting module 311 uses mathematical expression 6, can calculate moving body during measurement interval (measurement interval)
The distance d of 100 movementsm.Moving body 100 is in arbitrary time t1Receive the first reference symbol and receive power, can be in the arbitrary time
t2Receive the second reference symbol and receive power.That is, t2Can with t1It is identical plus the value of measurement interval.
【Mathematical expression 6】
Wherein, d (t2) can be in time t2The distance between, 100 antenna of 210 antenna of adjacent base station and moving body.Selection
Module 311 can calculate d (t based on above-mentioned mathematical expression 32)。
Selecting module 311 seeks the speed of moving body 100 based on mathematical expression 7, and moving body 100 can be calculated based on mathematical expression 8
The cell residence time.Mathematical expression 7 is exported from mathematical expression 6, and mathematical expression 8 can be exported from mathematical expression 1 and mathematical expression 5.
【Mathematical expression 7】
dm=v × tm
【Mathematical expression 8】
dwr=2 × dhr
Selecting module 311 calculates each adjacent base station 210-1 and 210-2 cell residence time, when can cell be stopped
Between longest adjacent cells lattice 210-2 selected as Set cells.
In addition, adjacent base station 210-1 and 210-2 are not multiple but at one, selecting module 311 can not calculate cell
Residence time.In this case, selecting module 311 can start to switch with a unique adjacent base station.That is, selecting module
311 reduce the unnecessary calculating time, can efficiently perform switching.
Fig. 4 is the distance shown according to moving body, and display reference symbol receives the chart of watt level change, and Fig. 5 is to show
Go out the example that explanation calculates triggered time method.
With reference to figure 4 and Fig. 5, when the second adjacent base station 210-2 is selected as target BS, switching determining module 313 can be counted
Calculate the triggered time to target BS 210-2 triggering switchings.
Switching determines that the time 313 performs switching not directly to target BS 210-2, is cut by executable after the triggered time
Change.
Switch determining module 313 to improve handover success rate, prevent ping-pong (ping-pong effect), can count
Calculate the triggered time.Ping-pong is serving BS 200 and target BS 210-2 in turn to the antenna transmission signal of moving body 100
Phenomenon.Ping-pong can occur on the border of serving BS 200 and target BS 210-2.
In 3GPP TS 36.331, by the triggered time with 0,40,64,80,100,128,160,256,320,480,512,
640th, 1024,1280,2560 and 5120ms is defined, switching determining module 313 can by 0,40,64,80,100,128,160,256,
320th, one in 480,512,640,1024,1280,2560 and 5120ms, is calculated as the triggered time.
The antenna of moving body 100 can be identical with Fig. 4 from 200 received signal of serving BS.Moving body 100 is from serving BS
200 is more remote, and reference symbol receives power can be lower.For example, the reference according to distance between moving body 100 and serving BS 200
Symbol receives power, can be identical with above-mentioned mathematical expression 2.Switching determining module 313 can make moving body 100 not enter Radio Link
Failure field 410, starts to switch to target BS 210-2.
Ms is the measurement result (measurement result) of serving BS 200, and Hys can be to 3GPP LTE HO
The magnetic hysteresis parameters (hysteresis parameter) of Event A3.PA2It is that the switching through 3GPP LTE HO Event A2 is critical
Value, PRLFIt can be Radio Link Failure critical value.
T1 places are that the reception reference symbol reception power of moving body 100 is PA2Place, T2 places be from T1 places pass through
The place of moving body 100 during the triggered time, T3 places can be that the reference symbol reception power that moving body 100 receives is PRLF's
Place.In addition, T3 places can prepare delay (HO preparation delay) time time shift from T2 places by switching
The place of kinetoplast 100.
When moving body 100 enters Radio Link Failure field 410 by T3 places, switching determining device 300 can basis
Radio Link Failure, unsuccessfully switches.
Switch determining module 313 and adjust T2 places, handover success rate can be improved.That is, the adjustment triggering of determining module 313 is switched
Time, can improve handover success rate.Handover success rate can be that moving body 100 does not enter Radio Link Failure field 410, perform
The probability of switching.
In T1 places, the distance of moving body 100 and serving BS 200 is d (PA2), moving body 100 and service base in T3 places
200 distance of standing can be d (PRLF).Untill moving body 100 reaches T3 places by T1 places, moving body 100 moves ddis
Distance.Such as Fig. 5, moving body 100 can be mobile to the direction of arrow (from left side to right side).
Switching determining module 313 is based on mathematical expression 9, can calculate untill moving body 100 reaches T3 places by T1 places and move
Dynamic distance.
【Mathematical expression 9】
Wherein, ddisIt is moving body 100 by T1 places, reaches the distance moved untill T3 places, d (PA2) it is constant value,
D (P can be calculated based on above-mentioned mathematical expression 3 by switching determining module 313RLF)。
Switching determining module 313 can be based on mathematical expression 10, calculate the triggered time for being used for ensureing 99% handover success rate.
99% is that 3 times of value is given in standard deviation, and the standard deviation of -3 σ can be used in switching determining module 313.Moving body 100 receives
Reference symbol receive power be PRLFProbability can be 1%.
【Mathematical expression 10】
Wherein, TTTTIt it is the triggered time, X (- 3 σ) is that the small scale that standard deviation is -3 σ is decayed, TPrCan be that switching prepares
Time delay.
Maximum in the value for meeting mathematical expression 10 can be determined as the triggered time by switching determining module 313.For example, switching
Determining module 313 by 3GPP TS 36.331 and can meet maximum in the value of mathematical expression 10, be arranged to the triggered time.
Fig. 6 is to show that explanation determines an example of the action of switching in the switching determining device shown in Fig. 2, and Fig. 7 is to show
Go out the exemplary precedence diagram that explanation switching determines method.
With reference to figure 6 to Fig. 7, in step 710, switching determining device 300 calculates movement to adjacent base station 210-1 and 210-2
The cell residence time of body 100, can be by cell residence time longest adjacent base station selected as target BS.For example, the
The cell residence time C2 of two adjacent base station 200-2, the cell residence time C1 long than the first adjacent base station 200-1.
In this regard, switching determining device 300 can be by the second adjacent base station 200-2 selected as target BS.
In step 730, switching determination device 300 can be calculated to be used to trigger target BS 210-2 triggerings in serving BS 200
Triggered time TTTT.Switching determining device 300 can calculate the triggered time T for preventing Radio Link FailureTTT。
For example, reference symbol receives power from critical value PA2_ThBegin to pass through triggered time TTTTAnd during switching preparation delay
Between TprepAfterwards, the executable switching of serving BS 200.In this case, triggered time TTTTWhen too short, switch determining device
300 can improve handover success rate, but ping-pong can occur.Triggered time TTTTWhen long, switching determining device 300 can prevent
Ping-pong, but Radio Link Failure can occur.That is, switching determining device 300 calculates appropriate triggered time TTTT, can improve
Handover success rate prevents ping-pong.
After Fig. 7 shows 300 selection target base station of switching determining device, triggered time T is calculatedTTT, but be not limited to
This, switching determining device 300 calculates triggered time TTTT, target BS also may be selected.
In step 750, switching determining device 300 can be based on triggered time TTTTStart to switch.For example, switching determining device
300 can transmit switching request signal to serving BS 200.For this reason, 200 response of serving BS asking in switching determining device 300
Signal is sought, can be to target BS, for example, the second adjacent base station 200-2 performs switching.
Fig. 8 is the example shown for evaluating switching determining device performance graph.
With reference to figure 8, switching determining device 300 can be based on the cell residence time, confirm what is occurred during selection target base station
Switching times.Switching times can be different according to the interval between base station.
Carrier wave (carrier) frequency is 700MHz, and the antenna height of serving BS 200 is 30m, the antenna of moving body 100
Height is 2m, and the distance between serving BS 200 and moving body 100 are 100m, and the transmission electric power of serving BS 200 is 86dBm,
Event A2 critical values may be configured as -50dBm.Interval variation to 200m~1400m, moving body 100 between base station may be configured as
Mobile 50Km distances.
Reference chart, can confirm to consider the Event A3 models of the signal strength of serving BS 200 and target BS, and examine
Consider the Event A2 models of 200 critical value of serving BS, and the base station interval of the switching determining device 300 according to one embodiment
Switching times.
Interval between base station is narrower, can confirm according to the switching times of the switching determining device 300 of one embodiment for most
It is few.
The situation of Event A3 models, using serving BS 200 and the signal difference of target BS, each moving body 100
Switching is performed when running into target BS, total switching times can be identical with the number of base station in section.
The situation of Event A2 models, unrelated with target BS, the reference symbol that serving BS 200 receives receives power drop
When as low as by the switch threshold value of 3GPP LTE HO Event A2, it can switch.That is, Event A2 models are than Event
A3 models switch less.The situation of Event A2 models, during selected target base station, using nearest base station.
According to the switching determining device 300 of one embodiment, cell residence time longest adjacent base station may be selected.Cut
Determining device 300 is changed than Event A2 models, there are less switching times.Between switching determining device 300 between base station
When 200m~1000m is changed to, the switching than Event A3 models few 89% is performed, can perform fewer than Event A2 models
35% switching.
Fig. 9 is other examples shown for evaluating switching determining device performance graph.
With reference to figure 9, the handover success rate according to 100 speed of moving body can be confirmed.In this case, can confirm according to tactile
Send out the handover success rate of time.
Identical with Fig. 8, carrier frequency is 700MHz, and the antenna height of serving BS 200 is 30m, the antenna of moving body 100
Height is 2m, and the distance between serving BS 200 and moving body 100 are 100m, and the transmission electric power of serving BS 200 is 86dBm,
Event A2 critical values may be configured as -50dBm.In this case, the standard deviation that small scale decay occurs can be 4dB.
Reference chart, may compare the handover success rate of the switching determining device 300 according to one embodiment, and utilize service
The Event A2 models of 200 critical value of base station, utilize the handover success rate for the TTT value situations being defined in 3GPP standards.
The speed of moving body 100 more increases, and can be reduced using the handover success rate of the Event A2 models of fixed TTT values.
According to one embodiment, switching determining device 300 will can also switch in the situation of the velocity variations of moving body 100
Success rate maintains 99%.For example, when the speed of moving body 100 is 350km/h, according to the switching determining device of one embodiment
300, compared with TTT for 5120,2560,1025ms when, handover success rate can distinguish high 5%p, 2.1%p, 0.1%p.Switch successfully
Rate is more increased switching times increase, can also be increased to this with the handover success rate to single switching, the displacement distance of moving body 100
Handoff failure number.Preferably, during unmanned moving body 100, big accident can also only be led to by 1 failure, so, to carry
High handover success rate.
Triggered time hour will be arranged to, handover success rate can be improved, still, can occurred again to before through attenuating
Serving BS 200 performs the ping-pong of switching.According to one embodiment, in the triggered time that switching determining device 300 calculates
In the range of, will be arranged to maximum the triggered time can prevent ping-pong, improve handover success rate.
The device of described above can be by hardware inscape, software sharing key element, and/or hardware inscape and software structure
Combination into key element is embodied as.For example, the device and inscape of explanation, using similar processor, controller, arithmetical logic
It is unit ALU (arithmetic logic unit), digital signal processor (digital signal processor), miniature
Computer, field programmable gate array FPA (field programmable array), programmable logic cells PLU
(programmable logic unit), other any devices of microprocessor or execute instruction (instruction), one
Model above is embodied as with computer or specific purposes computer.Processing unit can perform operating system (OS) and the operating system
In performed more than one software application.In addition, processing unit can response software execution, accessing, storing, transporting
Row, processing, generation data.In order to make it easy to understand, processing unit is illustrated to be to use one, but in the related technical field, tool
Have usual knowledge it should be understood to the one skilled in the art that processing unit may include multiple treatment elements (processing element) and/
Or the treatment element of multiple types.For example, processing unit may include multiple processors or a processor, and a control
Device.In addition it is also possible to it is other processing configurations (processing of similar parallel processor (parallel processor)
configuration)。
Software is computer program (computer program), code (code), order (instruction) or can
Including one of combination above, and it can order and form processing unit, either independent or knot by the action being willing to
(collectively) processing unit closed.Software and/or data are explained through processing unit or in order to be carried to processing dress
For order or data, machine, inscape (component), physics dress which type (embody) is can be specific
Put, virtual bench (virtual equipment), computer-readable storage medium either device or in the signal wave being transmitted
(signal wave) is permanent, or for the moment.Software is dispersed in the computer system by network connection, with scattered side
Method is stored or can be performed.Software and data are storable in more than one computer-readable recording medium.
Method according to the embodiment can be recorded in the form of the programmed instruction that can perform by a variety of computer means and be counted
In calculation machine readable media.Computer-readable media may include independent or combination programmed instruction, data file, data structure
Deng.Media and programmed instruction can be especially designed and create for the present invention, or be answered for computer software technology personnel are known
With.The example of computer-readable media includes：Magnetic media (magnetic media), such as hard disk, floppy disk and tape；Optical media
(optical media), such as CD ROM, DVD；Magneto-optical media (magneto-optical media), such as CD (floptical
disk)；Be specially configured to storage and execute program instructions hardware unit, such as read-only storage (ROM), random access memory
Device (RAM) etc..The example of programmed instruction, both includes the machine code produced by compiler, also includes the use of interpretive program and simultaneously may be used
The higher-level language code being performed by computer.To perform the running of embodiment, the hardware unit can be configured as with one
Software mould more than a operates, and vice versa.
As it appears from the above, although the present invention is illustrated that the invention is not restricted to the reality by the embodiment sheath figure limited
Example is applied, and those skilled in the art can carry out various modifications and changes from these equipment.For example, explanation technology and say
The inscapes such as the different system for being performed and/or illustrating of bright method, structure, device, circuit are different from the method that rope is ordered
Combination of shape and state either combine or replaced through other inscapes or equipollent or displacement also can reach appropriate knot
Fruit.
Therefore, other embody, other embodiment and impartial with claim, fall within right described later.
Claims (16)
1. one kind switching determines method, its step includes：
Cell residence time based on moving body, selection target base station；And
Power is received based on reference symbol, starts to switch to the target BS.
2. switching according to claim 1 determines method, it is characterized in that, the step of beginning, includes：
When the reference symbol reception power is less than critical value, when calculating the triggering for switching to target BS triggering
Between；And
The switching is started based on the triggered time.
3. switching according to claim 1 determines method, it is characterized in that, selected step includes：
For multiple adjacent base stations, the cell residence time is calculated；And
In the multiple base station, by the cell residence time longest base station, target BS described in selected as.
4. switching according to claim 1 determines method, it is characterized in that, the critical value is through 3GPP LTE HO
The switch threshold value of Event A2.
5. switching according to claim 2 determines method, it is characterized in that, the switching is started based on the triggered time
Step includes：
The reference symbol receives power and passes through the triggered time from critical value, then starts the switching.
6. switching according to claim 2 determines method, it is characterized in that, the calculation procedure includes：
Using switch threshold value, Radio Link Failure, switching time and path loss model in it is at least one, described in calculating
Triggered time.
7. switching according to claim 6 determines method, it is characterized in that, the step of calculating, includes：
The triggered time is calculated based on following mathematical expression,
【Mathematical expression】
<mrow>
<msub>
<mi>T</mi>
<mrow>
<mi>T</mi>
<mi>T</mi>
<mi>T</mi>
</mrow>
</msub>
<mo>&le;</mo>
<mfrac>
<msub>
<mi>d</mi>
<mrow>
<mi>d</mi>
<mi>i</mi>
<mi>s</mi>
</mrow>
</msub>
<mi>v</mi>
</mfrac>
<mo>-</mo>
<msubsup>
<mi>T</mi>
<mrow>
<mi>H</mi>
<mi>O</mi>
</mrow>
<mrow>
<mi>p</mi>
<mi>r</mi>
<mi>e</mi>
<mi>p</mi>
</mrow>
</msubsup>
</mrow>
Wherein, TTTTIt is the triggered time, ddisIt is on the mobile route of the moving body, the reference symbol receives power and exists
The distance between the place of the switch threshold value and the place of the Radio Link Failure, v are the mobile speed of the moving body
Degree,It is the switching time.
8. switching according to claim 7 determines method, it is characterized in that, the triggered time is to meet the mathematical expression value
In maximum.
9. a kind of switching determining device of definite base station switching, it includes：
Controller, the cell residence time selection target base station based on moving body, receives power, to described based on reference symbol
Target BS starts to switch.
10. switching determining device according to claim 9, it is characterized in that, the controller is received in the reference symbol
When power is less than critical value, the triggered time being used for target BS triggering switching is calculated, is opened based on the triggered time
Begin the switching.
11. switching determining device according to claim 9, it is characterized in that, the controller is to serving BS and multiple phases
Adjacent base station calculates the cell residence time, by cell residence time longest base station described in the multiple base station, choosing
It is selected as the target BS.
12. switching determining device according to claim 9, it is characterized in that, the critical value is through 3GPP LTE HO
The switch threshold value of Event A2.
13. switching determining device according to claim 10, it is characterized in that, the reference symbol receives power from critical value
By the triggered time, the controller starts the switching.
14. switching determining device according to claim 10, it is characterized in that, the controller uses switch threshold value, nothing
It is at least one in wired link failure, switching time and path loss model, calculate the triggered time.
15. switching determining device according to claim 14, it is characterized in that, the controller is calculated based on following mathematical expression
The triggered time,
【Mathematical expression】
<mrow>
<msub>
<mi>T</mi>
<mrow>
<mi>T</mi>
<mi>T</mi>
<mi>T</mi>
</mrow>
</msub>
<mo>&le;</mo>
<mfrac>
<msub>
<mi>d</mi>
<mrow>
<mi>d</mi>
<mi>i</mi>
<mi>s</mi>
</mrow>
</msub>
<mi>v</mi>
</mfrac>
<mo>-</mo>
<msubsup>
<mi>T</mi>
<mrow>
<mi>H</mi>
<mi>O</mi>
</mrow>
<mrow>
<mi>p</mi>
<mi>r</mi>
<mi>e</mi>
<mi>p</mi>
</mrow>
</msubsup>
</mrow>
Wherein, TTTTIt is the triggered time, ddisIt is on the mobile route of the moving body, the reference symbol receives power and exists
The distance between the place of the switch threshold value and the place of the Radio Link Failure, v are the mobile speed of the moving body
Degree,It is the switching time.
16. switching determining device according to claim 15, it is characterized in that, the triggered time is to meet the mathematical expression
Maximum in value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2016-0140013 | 2016-10-26 | ||
| KR1020160140013A KR101849469B1 (en) | 2016-10-26 | 2016-10-26 | Method and an apparatus for determining a handover |
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|---|---|
| CN107995663A true CN107995663A (en) | 2018-05-04 |
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| CN201711019220.9A Pending CN107995663A (en) | 2016-10-26 | 2017-10-26 | Switching determines method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021030713A1 (en) * | 2019-08-15 | 2021-02-18 | Qualcomm Incorporated | Optimizations to support enhanced handover procedures |
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| CN102572982A (en) * | 2010-12-08 | 2012-07-11 | 同济大学 | Multi-attribute handover decision method for heterogeneous vehicle communication network |
| CN103945467A (en) * | 2014-04-21 | 2014-07-23 | 大唐移动通信设备有限公司 | Cell switching method and system, base station and terminal |
| US20140308952A1 (en) * | 2013-04-16 | 2014-10-16 | Electronics And Telecommunications Research Institute | Apparatus and method for providing handover information within femtocell network and terminal using the same |
| CN104320817A (en) * | 2014-10-21 | 2015-01-28 | 中国联合网络通信集团有限公司 | Switch method based on multi-mode network, base station and user equipment |
| CN105578506A (en) * | 2015-12-22 | 2016-05-11 | 北京交通大学 | Switching method base on channel information under track traffic high speed moving environment |
-
2016
- 2016-10-26 KR KR1020160140013A patent/KR101849469B1/en active IP Right Grant
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2017
- 2017-10-26 CN CN201711019220.9A patent/CN107995663A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| CN102572982A (en) * | 2010-12-08 | 2012-07-11 | 同济大学 | Multi-attribute handover decision method for heterogeneous vehicle communication network |
| US20140308952A1 (en) * | 2013-04-16 | 2014-10-16 | Electronics And Telecommunications Research Institute | Apparatus and method for providing handover information within femtocell network and terminal using the same |
| CN103945467A (en) * | 2014-04-21 | 2014-07-23 | 大唐移动通信设备有限公司 | Cell switching method and system, base station and terminal |
| CN104320817A (en) * | 2014-10-21 | 2015-01-28 | 中国联合网络通信集团有限公司 | Switch method based on multi-mode network, base station and user equipment |
| CN105578506A (en) * | 2015-12-22 | 2016-05-11 | 北京交通大学 | Switching method base on channel information under track traffic high speed moving environment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021030713A1 (en) * | 2019-08-15 | 2021-02-18 | Qualcomm Incorporated | Optimizations to support enhanced handover procedures |
| US11622309B2 (en) | 2019-08-15 | 2023-04-04 | Qualcomm Incorporated | Optimizations to support enhanced handover procedures |
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| KR101849469B1 (en) | 2018-04-16 |
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