CN105208615A - Switching method based on adjustable prediction threshold hysteresis margin in super-dense network - Google Patents
Switching method based on adjustable prediction threshold hysteresis margin in super-dense network Download PDFInfo
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- CN105208615A CN105208615A CN201510334856.7A CN201510334856A CN105208615A CN 105208615 A CN105208615 A CN 105208615A CN 201510334856 A CN201510334856 A CN 201510334856A CN 105208615 A CN105208615 A CN 105208615A
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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
- H04W36/24—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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
Abstract
In a fifth generation (5G) mobile system, large-scale MIMO antennas and super-dense deployment networks are two modes for realizing high throughout. In allusion to a problem of frequent switching of super-dense networks, the invention provides a switching management method for hysteresis margin automatic adjustment according to movement conditions of terminal equipment based on an idea of super-dense network clustering. According to the invention, clustering management is carried out on small base stations, switching of user equipment between cells is divided into a pre-switching stage and a formal switching stage, and the switching threshold hysteresis margin is adjusted correspondingly according to the speed of the equipment, thereby completing a switching process of the equipment between the cells. The method provided by the invention can effectively reduce the switching time delay and the switching failure rate of the equipment.
Description
Technical field
The present invention relates to mobile communication technology field, particularly to relate in 5G system changing method adjustable based on prediction thresholding hysteresis margin in a kind of super-intensive Cluster Networks.
Background technology
In the 5th generation (5G) mobile system, extensive mimo antenna and super-intensive on-premise network realize two kinds of modes of high-throughput.Along with the fast development of internet, applications and the explosion type of data traffic requirement increase, wireless network is faced with huge challenge.In order to meet the demand of mass data communication, need to dispose little base station on a large scale in some hot spot regions.In the face of the complexity of network design and the complexity of user behavior, super-intensive on-premise network has larger advantage.In theory, network capabilities is relevant with the base station number of unit are.The large base station that the coverage of little base station is relatively traditional is less, large area can dispose, can improve the network throughput of current area greatly, solve the network throughput needs of problems of hot spot region inside certain region.
In the dense deployment of network, mobile management is the major issue of network research.In the super-intensive network in future, the continuous movement of equipment will cause a large amount of handover operations, thus brings a large amount of Signalling exchanges, considerably increases the burden of network parts.Therefore, traditional motion management method can not meet the deployment request of following super-intensive wireless network well, and the wireless network that following super-intensive is disposed needs better mobile management model and method for analyzing performance.
Summary of the invention
Technical problem: the diversified feature that the present invention is directed to the complicated of user terminal movement and business, propose changing method adjustable based on prediction thresholding hysteresis margin in a kind of super-intensive Cluster Networks, and select different Target cells according to the motion conditions of user terminal.Adopt pre-switch and two stages of formal switching, significantly reduce the formal time delay switched, adopt adjustable prediction thresholding hysteresis margin, equipment can be made in case of higher speeds, accelerate the process switched, minimizing handover failure rate.
Technical scheme: the present invention is to provide handoff algorithms adjustable based on prediction thresholding hysteresis margin in a kind of super-intensive Cluster Networks, comprise the following steps:
The signal quality of the monitoring cell base station of A, mobile terminal period, comprises macro base station and little base station;
Whether the wireless signal strength of B, detection resources base station is greater than pre-switch thresholding, if meet pre-switch condition, performs step C; Otherwise execution steps A;
C, source base station constantly measure the movement velocity of described mobile terminal, if the speed of described mobile terminal is greater than thresholding speed, perform step D; Otherwise execution step e;
D, to macro base station controller reporting, described mobile terminal pre-switch community is macrocell, performs step F;
E, base station controller report to corresponding Microcell bunch, described mobile terminal pre-switch cell preference selects Microcell, performs step F;
F, source base station monitor the cell-of-origin wireless signal strength of described mobile terminal, and controller, according to the motion conditions of described mobile terminal, selects best Microcell, and calculate the numerical value of hysteresis margin according to the speed of described mobile terminal, perform step G;
Whether the wireless signal strength of G, source base station reaches the formal thresholding switched, if meet the formal condition switched, described mobile terminal starts to carry out handover operation, process ends; If meet, perform step F.
In steps A of the present invention, definition time T is monitoring periods, and property performance period is monitored and upgraded positional information; If the signal quality of cell base station, comprise macro base station or little base station, when meeting pre-switch condition, mobile terminal will prepare to carry out pre-switch; If when the signal quality of cell base station does not meet pre-switch condition, mobile terminal will continue to monitor cell base station signals; The Internet resources of community are maximally utilised under the prerequisite ensureing optimal network signal.
In step B of the present invention, when equipment moves in community, device periodically uploads the measurement report of oneself to local controller, comprising the service conditions of equipment and the wireless signal strength value etc. of source base station and peripheral base station.The information that local controller is uploaded according to equipment, whether the state of judgment device arrives the pre-switch stage.When the wireless signal strength value of cell-of-origin arrives pre-switch thresholding, now pre-switch event triggers, and equipment starts the state information sending oneself to base station, comprises the position of equipment, speed, the wireless signal strength value etc. of business information and source base station and peripheral base station.The reporting information of base station receiver equipment, uploads to local controller.The data analysis that local controller is uploaded equipment, chooses candidate base station for equipment switches.If do not reach pre-switch condition, then continue the information that the described terminal of monitoring is uploaded.
In step C of the present invention, the speed of local controller monitoring equipment, if be greater than can the maximal rate that allows to little base station of successful switch for the translational speed of equipment, then to macro base station controller notice, equipment will be switched in corresponding macrocell.If the translational speed of equipment is less than allowed maximal rate, then peritropous controller is informed, equipment will be switched in small-cell.The information of local controller recording equipment, and by the tracking measurement of mobile device relative to the percentage speed variation of each candidate base station, choose optimum target candidate base station.Meanwhile, notify the controller of adjacent small-cell, the optimal objective community of annunciator pre-switch.
In step D of the present invention, the translational speed of described mobile terminal is greater than can the maximal rate that allows to little base station of successful switch, then to macro base station controller notice, equipment will be switched in corresponding macrocell.The information of local controller recording equipment, and by the tracking measurement of mobile device relative to the percentage speed variation of each candidate base station, choose optimum target candidate base station.
In step e of the present invention, the translational speed of described mobile terminal is less than allowed maximal rate, then peritropous controller is informed, equipment will be switched in small-cell.The information of local controller recording equipment, and by the tracking measurement of mobile device relative to the percentage speed variation of each candidate base station, choose optimum target candidate base station.Meanwhile, notify the controller of adjacent small-cell, the optimal objective community of annunciator pre-switch.
In step F of the present invention, source base station monitors the cell-of-origin wireless signal strength of described mobile terminal, and controller, according to the motion conditions of described mobile terminal, selects best Microcell.
Suppose that the angle that equipment enters community is arbitrary, the position that equipment enters community is the center of B point, O Dian Wei community, and set up coordinate system, OX is x-axis, and the angle of OB and OX is β; The position that equipment leaves community is E point, and the angle of OE and OX is γ.Therefore, can know that the probability density function of β is:
In like manner, the probability density function of γ is:
Suppose that equipment normal minimum movement distance accessed in community is l, if if namely equipment move distance is less than l, so equipment can not handover success.So have:
l＝vt
i(3)
Suppose d be equipment from entering community to the air line distance leaving community, i.e. the length of BE, can be in the hope of:
α is equipment from the line entering Dian He center, community and the angle of line leaving Dian He center, community, i.e. the angle of OB and OE, so have:
α＝|β-γ|(5)
Therefore the scope of α is: 0≤α≤2 π.β and γ is separate, and therefore their joint probability density function is:
The probability-distribution function formula that we can obtain α by (5) (6) is:
F
α(x)＝P(α＜x)＝P(|β-λ|＜x)＝P(-x＜β-λ＜x)(7)
As x < 0, F
α(x)=0; As x > 2 π, F
α(x)=1.As 0≤α≤2 π,
So have the probability density function of α to be according to probabilistic knowledge:
By (4) formula
the probability-distribution function that can be obtained d by probabilistic knowledge is:
So according to probabilistic knowledge, can obtain d has following probability-distribution function:
If t switching time of equipment
inecessarily, d
minifor equipment successful switch enters the shortest move distance of community.So when the speed of equipment is different, d will be affected
minivalue.Want to be switched in community, d
minimaximum be 2R.
As d≤d
minitime, equipment handoff failure.So the probability of handoff failure is
As d > d
minitime, equipment will successful switch.Now the probability of equipment handoff failure is:
P
hf＝0(13)
So the probability of handoff failure is:
The time that equipment of considering will switch out community future is t
o, have d
mini=vt
i, d
mino=vt
o, wherein d
minifor successful switch enters the shortest move distance of community, d
minofor successful switch goes out the shortest move distance of community.If the time of staying t < t of equipment in community
i+ t
o, so equipment can only enter community by successful switch, and future can not go out community by successful switch.Its handover occurred is exactly unnecessary switching, and the probability of therefore unnecessary switching is:
Can know according to path loss model:
RSS＝E
t-P
L+ξ(16)
Wherein, E
tfor the transmitting power of base station, P
lbe path loss model, ξ is that to obey zero-mean, standard deviation be the shadow fading of σ, the signal strength signal intensity of the base station that RSS indication equipment receives.
Therefore, the equipment that can obtain in the RSS value of pre-switch and the relation of position is:
RSS
th0＝E
t-P
L1+ξ(17)
The equipment that simultaneously can obtain in the relation of the RSS value switched when starting and position is:
RSS
th1＝E
t-P
L2+ξ(18)
The variable quantity of RSS in equipment moving can be obtained according to formula (17) and (18)
△rSS is:
Wherein β is according to the constant in different path loss model situation.
Suppose that equipment is l from the pre-switch stage to the distance that formal switch step is walked
aA'.Suppose that equipment is t from the pre-switch stage to the time that formal switch step is walked
p, the translational speed of equipment is v, so just has:
l
AA'＝vt
p(20)
According to formula (19), the wireless signal strength changing value that can obtain changing to from pre-cut formal switching is:
When equipment moving speed is v, according to the speed of described mobile terminal, by the numerical value of the speed control lag surplus according to equipment.
a < 0, wherein a is constant.When v increases,
△rSS trends towards
△rSS constantly reduces.When device rate is faster, the hysteresis margin in algorithm is less, and equipment switching time more in advance.
In step G of the present invention, whether the wireless signal strength of source base station reaches the formal thresholding switched, if meet the formal condition switched, described mobile terminal starts to carry out handover operation; If do not reach condition, the rate of change of the wireless signal strength of base station controller records equipment.In the process of equipment moving, if the rate of change of the wireless signal strength of source base station becomes positive number from negative, and continue for some time t, equipment of can judging may counter motion, starts away from handoff boundary.When the wireless signal strength of cell-of-origin is greater than pre-switch thresholding, local controller is cancelled pre-switch and is prepared, and carries out normality monitoring to equipment.
Beneficial effect: the present invention compared with prior art, has the following advantages:
Invention introduces the sub-clustering centralized management of little base station, subregion centralized management is carried out according to the condition such as region location and signal strength signal intensity in little base station, effectively can reduce the signaling amount in core network, simplify and accelerate the transmitting procedure of signaling.Add pre-switch process before formal switching, the Resourse Distribute, authentication etc. in more original formal handoff procedures can be operated in the pre-switch stage completes, and can accelerate the formal flow process switched like this, reduce the time delay switched.When the signal strength signal intensity of source base station is less than the threshold value of setting, equipment switches formal initiation, compared to traditional changing method (target BS signal strength signal intensity is higher than the switching criterion of a source base station hysteresis margin), can effectively reduce unnecessary switching times, in this method, the hysteresis margin of handoff threshold value adjusts dynamically according to the speed conditions of equipment simultaneously, compared with the method for traditional permanent delay surplus, decrease the handover failure rate of equipment.The network improving user is experienced.
Accompanying drawing explanation
Fig. 1 is the switching flow figure of entirety provided by the present invention.
Fig. 2 is entire system Organization Chart provided by the present invention.
Fig. 3 is equipment provided by the present invention movement locus forecast model figure in the cell.
Fig. 4 is the scene schematic diagram of the little area overlapping distribution of super-intensive provided by the present invention.
Fig. 5 is the schematic diagram of the signaling process of switching in same cell cluster provided by the present invention.
Fig. 6 is the schematic diagram of the signaling process of switching in different districts provided by the present invention bunch.
Embodiment
Below will be described in detail example of the present invention.
The present invention is to provide handoff algorithms adjustable based on prediction thresholding hysteresis margin in a kind of super-intensive Cluster Networks.The signal quality of the monitoring cell base station of mobile terminal period, comprise macro base station and little base station, property performance period is monitored and is upgraded positional information.When described terminal moves in community, equipment by the measurement report of periodically uploading oneself to local controller, comprising the service conditions of equipment and the wireless signal strength value etc. of source base station and peripheral base station.The information that local controller is uploaded according to equipment, whether the state of judgment device arrives the pre-switch stage.When the wireless signal strength value of cell-of-origin arrives pre-switch thresholding, now pre-switch event triggers, and equipment starts the state information sending oneself to base station, comprises the position of equipment, speed, the wireless signal strength value etc. of business information and source base station and peripheral base station.The reporting information of base station receiver equipment, uploads to local controller.The data analysis that local controller is uploaded equipment, chooses candidate base station for equipment switches.If do not reach pre-switch condition, then continue the information that the described terminal of monitoring is uploaded.
The speed of local controller monitoring equipment, if be greater than can the maximal rate that allows to little base station of successful switch for the translational speed of equipment, then to macro base station controller notice, equipment will be switched in corresponding macrocell.If the translational speed of equipment is less than allowed maximal rate, then peritropous controller is informed, equipment will be switched in small-cell.The information of local controller recording equipment, and by the tracking measurement of mobile device relative to the percentage speed variation of each candidate base station, choose optimum target candidate base station.Meanwhile, notify the controller of adjacent small-cell, the optimal objective community of annunciator pre-switch.
Suppose that the angle that equipment enters community is arbitrary, the position that equipment enters community is the center of B point, O Dian Wei community, and set up coordinate system, OX is x-axis, and the angle of OB and OX is β; The position that equipment leaves community is E point, and the angle of OE and OX is γ.Therefore, can know that the probability density function of β is:
In like manner, the probability density function of γ is:
Suppose that equipment normal minimum movement distance accessed in community is l, if if namely equipment move distance is less than l, so equipment can not handover success.So have:
l＝vt
i(3)
Suppose d be equipment from entering community to the air line distance leaving community, i.e. the length of BE, can be in the hope of:
α is equipment from the line entering Dian He center, community and the angle of line leaving Dian He center, community, i.e. the angle of OB and OE, so have:
α＝|β-γ|(5)
Therefore the scope of α is: 0≤α≤2 π.β and γ is separate, and therefore their joint probability density function is:
The probability-distribution function formula that we can obtain α by (5) (6) is:
F
α(x)＝P(α＜x)＝P(|β-λ|＜x)＝P(-x＜β-λ＜x)(7)
As x < 0, F
α(x)=0; As x > 2 π, F
α(x)=1.As 0≤α≤2 π,
So have the probability density function of α to be according to probabilistic knowledge:
By (4) formula
the probability-distribution function that can be obtained d by probabilistic knowledge is:
So according to probabilistic knowledge, can obtain d has following probability-distribution function:
If t switching time of equipment
inecessarily, d
minifor equipment successful switch enters the shortest move distance of community.So when the speed of equipment is different, d will be affected
minivalue.Want to be switched in community, d
minimaximum be 2R.
As d≤d
minitime, equipment handoff failure.So the probability of handoff failure is
As d > d
minitime, equipment will successful switch.Now the probability of equipment handoff failure is:
P
hf＝0(13)
So the probability of handoff failure is:
The time that equipment of considering will switch out community future is t
o, have d
mini=vt
i, d
mino=vt
o, wherein d
minifor successful switch enters the shortest move distance of community, d
minofor successful switch goes out the shortest move distance of community.If the time of staying t < t of equipment in community
i+ t
o, so equipment can only enter community by successful switch, and future can not go out community by successful switch.Its handover occurred is exactly unnecessary switching, and the probability of therefore unnecessary switching is:
Can know according to path loss model:
RSS＝E
t-P
L+ξ(16)
Wherein, E
tfor the transmitting power of base station, P
lbe path loss model, ξ is that to obey zero-mean, standard deviation be the shadow fading of σ, the signal strength signal intensity of the base station that RSS indication equipment receives.
Therefore, the equipment that can obtain in the RSS value of pre-switch and the relation of position is:
RSS
th0＝E
t-P
L1+ξ(17)
The equipment that simultaneously can obtain in the relation of the RSS value switched when starting and position is:
RSS
th1＝E
t-P
L2+ξ(18)
The variable quantity of RSS in equipment moving can be obtained according to formula (17) and (18)
△rSS is:
Wherein β is according to the constant in different path loss model situation.
Suppose that equipment is l from the pre-switch stage to the distance that formal switch step is walked
aA'.Suppose that equipment is t from the pre-switch stage to the time that formal switch step is walked
p, the translational speed of equipment is v, so just has:
l
AA'＝vt
p(20)
According to formula (19), the wireless signal strength changing value that can obtain changing to from pre-cut formal switching is:
When equipment moving speed is v, according to the speed of described mobile terminal, by the numerical value of the speed control lag surplus according to equipment.
a < 0, wherein a is constant.When v increases,
△rSS trends towards
△rSS constantly reduces.When device rate is faster, the hysteresis margin in algorithm is less, and equipment switching time more in advance.
When the wireless signal strength of source base station reaches the formal thresholding switched, described mobile terminal starts to carry out handover operation; If do not reach condition, the rate of change of the wireless signal strength of base station controller records equipment.In the process of equipment moving, if the rate of change of the wireless signal strength of source base station becomes positive number from negative, and continue for some time t, equipment of can judging may counter motion, starts away from handoff boundary.When the wireless signal strength of cell-of-origin is greater than pre-switch thresholding, local controller is cancelled pre-switch and is prepared, and carries out normality monitoring to equipment.
Claims (8)
1. in super-intensive network based on the changing method that prediction thresholding hysteresis margin is adjustable, it is characterized in that the method comprises the following steps:
The signal quality of the monitoring cell base station of A, mobile terminal period, comprises macro base station and little base station;
Whether the wireless signal strength of B, detection resources base station is greater than pre-switch thresholding, if meet pre-switch condition, performs step C; Otherwise execution steps A;
C, source base station constantly measure the movement velocity of described mobile terminal, if the speed of described mobile terminal is greater than thresholding speed, perform step D; Otherwise execution step e;
D, to macro base station controller reporting, described mobile terminal pre-switch community is macrocell, performs step F;
E, base station controller report to corresponding Microcell bunch, described mobile terminal pre-switch cell preference selects Microcell, performs step F;
F, source base station monitor the cell-of-origin wireless signal strength of described mobile terminal, and controller, according to the motion conditions of described mobile terminal, selects best Microcell, and calculate the numerical value of hysteresis margin according to the speed of described mobile terminal, perform step G;
Whether the wireless signal strength of G, source base station reaches the formal thresholding switched, if meet the formal condition switched, described mobile terminal starts to carry out handover operation, process ends; If meet, perform step F.
2. method according to claim 1, is characterized in that, in described steps A, definition time T is monitoring periods, and property performance period is monitored and upgraded positional information; If the signal quality of cell base station, comprise macro base station or little base station, when meeting pre-switch condition, mobile terminal will prepare to carry out pre-switch; If when the signal quality of cell base station does not meet pre-switch condition, mobile terminal will continue to monitor cell base station signals; The Internet resources of community are maximally utilised under the prerequisite ensureing optimal network signal.
3. method according to claim 1, it is characterized in that, in described step B, when equipment moves in community, device periodically uploads the measurement report of oneself to local controller, comprises the service conditions of equipment and the wireless signal strength value of source base station and peripheral base station; The information that local controller is uploaded according to equipment, whether the state of judgment device arrives the pre-switch stage; When the wireless signal strength value of cell-of-origin arrives pre-switch thresholding, now pre-switch event triggers, and equipment starts the state information sending oneself to base station, comprises the position of equipment, speed, the wireless signal strength value of business information and source base station and peripheral base station; The reporting information of base station receiver equipment, uploads to local controller; The data analysis that local controller is uploaded equipment, chooses candidate base station for equipment switches; If do not reach pre-switch condition, then continue the information that the described terminal of monitoring is uploaded.
4. method according to claim 1, it is characterized in that, in described step C, the speed of local controller monitoring equipment, can the maximal rate that allows to little base station of successful switch if the translational speed of equipment is greater than, then to macro base station controller notice, equipment will be switched in corresponding macrocell; If the translational speed of equipment is less than allowed maximal rate, then peritropous controller is informed, equipment will be switched in small-cell; The information of local controller recording equipment, and by the tracking measurement of mobile device relative to the percentage speed variation of each candidate base station, choose optimum target candidate base station; Meanwhile, notify the controller of adjacent small-cell, the optimal objective community of annunciator pre-switch.
5. method according to claim 1, it is characterized in that, in described step D, the translational speed of described mobile terminal is greater than can the maximal rate that allows to little base station of successful switch, then to macro base station controller notice, equipment will be switched in corresponding macrocell; The information of local controller recording equipment, and by the tracking measurement of mobile device relative to the percentage speed variation of each candidate base station, choose optimum target candidate base station.
6. method according to claim 1, is characterized in that, in described step e, the translational speed of described mobile terminal is less than allowed maximal rate, then peritropous controller is informed, equipment will be switched in small-cell; The information of local controller recording equipment, and by the tracking measurement of mobile device relative to the percentage speed variation of each candidate base station, choose optimum target candidate base station, simultaneously, notify the controller of adjacent small-cell, the optimal objective community of annunciator pre-switch.
7. method according to claim 1, is characterized in that, in described step F, source base station monitors the cell-of-origin wireless signal strength of described mobile terminal, and controller, according to the motion conditions of described mobile terminal, selects Microcell;
Suppose that the angle that equipment enters community is arbitrary, the position that equipment enters community is the center of B point, O Dian Wei community, and set up coordinate system, OX is x-axis, and the angle of OB and OX is β; The position that equipment leaves community is E point, and the angle of OE and OX is γ, therefore, can know that the probability density function of β is:
In like manner, the probability density function of γ is:
Suppose that equipment normal minimum movement distance accessed in community is l, if if namely equipment move distance is less than l, so equipment can not handover success.So have:
l＝vt
i(3)
Suppose d be equipment from entering community to the air line distance leaving community, i.e. the length of BE, can be in the hope of:
α is equipment from the line entering Dian He center, community and the angle of line leaving Dian He center, community, i.e. the angle of OB and OE, so have:
α＝|β-γ|(5)
Therefore the scope of α is: 0≤α≤2 π, β and γ are mutual
independent, therefore their joint probability density function is:
The probability-distribution function formula that can be obtained α by (5) (6) is:
F
α(x)＝P(α＜x)＝P(|β-λ|＜x)＝P(-x＜β-λ＜x)(7)
As x < 0, F
α(x)=0; As x > 2 π, F
α(x)=1; As 0≤α≤2 π,
So have the probability density function of α to be according to probabilistic knowledge:
By (4) formula
the probability-distribution function that can be obtained d by probabilistic knowledge is:
So according to probabilistic knowledge, can obtain d has following probability-distribution function:
If t switching time of equipment
ibe a fixed value, d
minifor equipment successful switch enters the shortest move distance of community, so when the speed of equipment is different, d will be affected
minivalue; Want to be switched in community, d
minimaximum be 2R;
As d≤d
minitime, equipment handoff failure, so the probability of handoff failure is
As d > d
minitime, equipment will successful switch, and now the probability of equipment handoff failure is:
P
hf＝0(13)
So the probability of handoff failure is:
The time that equipment of considering will switch out community future is t
o, have d
mini=vt
i, d
muno=vt
o, wherein d
minifor successful switch enters the shortest move distance of community, d
minofor successful switch goes out the shortest move distance of community; If the time of staying t < t of equipment in community
i+ t
o, so equipment can only enter community by successful switch, and future can not go out community by successful switch, and its handover occurred is exactly unnecessary switching, and the probability of therefore unnecessary switching is:
Can know according to path loss model:
RSS＝E
t-P
L+ξ(16)
Wherein, E
tfor the transmitting power of base station, P
lbe path loss model, ξ is that to obey zero-mean, standard deviation be the shadow fading of σ, the signal strength signal intensity of the base station that RSS indication equipment receives;
Therefore, the equipment that can obtain in the RSS value of pre-switch and the relation of position is:
RSS
th0＝E
t-P
L1+ξ(17)
The equipment that simultaneously can obtain in the relation of the RSS value switched when starting and position is:
RSS
th1＝E
t-P
L2+ξ(18)
Can obtain the variation delta RSS of RSS in equipment moving according to formula (17) and (18) is:
Wherein β is according to the constant in different path loss model situation;
Suppose that equipment is l from the pre-switch stage to the distance that formal switch step is walked
aA', suppose that equipment is t from the pre-switch stage to the time that formal switch step is walked
p, the translational speed of equipment is v, so just has:
l
AA'＝vt
p(20)
According to formula (19), the wireless signal strength changing value that can obtain changing to from pre-cut formal switching is:
When equipment moving speed is v, according to the speed of described mobile terminal, by the numerical value of the speed control lag surplus according to equipment;
wherein a is constant; When v increases, Δ RSS trends towards
Δ RSS constantly reduces; When device rate is faster, the hysteresis margin in method is less, and equipment switching time more in advance.
8. method according to claim 1, is characterized in that, in described step G, whether the wireless signal strength of source base station reaches the formal thresholding switched, if meet the formal condition switched, described mobile terminal starts to carry out handover operation; If do not reach condition, the rate of change of the wireless signal strength of base station controller records equipment; In the process of equipment moving, if the rate of change of the wireless signal strength of source base station becomes positive number from negative, and continue for some time t, equipment of can judging may counter motion, starts away from handoff boundary; When the wireless signal strength of cell-of-origin is greater than pre-switch thresholding, local controller is cancelled pre-switch and is prepared, and carries out normality monitoring to equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510334856.7A CN105208615B (en) | 2015-06-16 | 2015-06-16 | Based on the prediction adjustable switching method of thresholding hysteresis margin in a kind of super-intensive network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510334856.7A CN105208615B (en) | 2015-06-16 | 2015-06-16 | Based on the prediction adjustable switching method of thresholding hysteresis margin in a kind of super-intensive network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105208615A true CN105208615A (en) | 2015-12-30 |
| CN105208615B CN105208615B (en) | 2019-04-16 |
Family
ID=54955964
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| CN105933940A (en) * | 2016-05-24 | 2016-09-07 | 安徽科技学院 | Seamless handover method based on collaborative base station clustering in ultra-dense network |
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| CN107302778A (en) * | 2017-08-23 | 2017-10-27 | 河海大学常州校区 | A kind of vertically downward switch determining method between macro base station and Home eNodeB |
| CN109714801A (en) * | 2019-02-26 | 2019-05-03 | 南京邮电大学 | D2D implementation method under handover case |
| CN109714801B (en) * | 2019-02-26 | 2021-05-25 | 南京邮电大学 | D2D implementation method in handover situation |
| CN111586777A (en) * | 2020-03-25 | 2020-08-25 | 北京邮电大学 | Network switching method and device under indoor environment, electronic equipment and storage medium |
| CN111586777B (en) * | 2020-03-25 | 2021-09-28 | 北京邮电大学 | Network switching method and device under indoor environment, electronic equipment and storage medium |
| CN114173385A (en) * | 2020-09-10 | 2022-03-11 | 华为技术有限公司 | Cell measurement method, device and system |
| CN114173385B (en) * | 2020-09-10 | 2023-06-02 | 华为技术有限公司 | Cell measurement method, device and system |
| CN114915981A (en) * | 2022-05-20 | 2022-08-16 | 中电信数智科技有限公司 | Method for analyzing and early warning cell base station signal switching failure |
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