CN105916180B - A kind of quick two layer switching method adaptive with rate travel - Google Patents
A kind of quick two layer switching method adaptive with rate travel Download PDFInfo
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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
- H04W36/0094—Definition of hand-off measurement parameters
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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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Abstract
The present invention is designed with the adaptive quick two layers of switching method of rate travel, comprising the following steps: 1 mobile terminal through-rate sensor module obtains current rate travel and obtains current received signal strength parameter by wireless network card；2 calculate trigger parameter according to present rate information；The trigger parameter they 3 comparisons current received signal strength parameter and be calculated, executes 4 if meeting；4 execute triggering handover operation when the parameter of step 3 is eligible；5 mobile terminals are respectively connected to the access point on two known channels and sounding channel, and selection signal intensity is stronger to be used as access point to be connected.Present invention uses the sensors of low cost to obtain reliable rate information, it is applied in the triggering switchover policy of mobile terminal, reliable quick two layers of handoff procedure is realized, in the drop probabilities for guaranteeing to reduce handoff procedure in the case where being reliably connected, there is preferable generalization.
Description
Technical field
The present invention relates to wireless communication technology field, cut in particular to a kind of with adaptive quick two layers of rate travel
Change method.
Background technique
With the fast development of wireless communication technique, for the prioritization scheme of communication bandwidth and communication distance also with various
Establishment of standard and gradually promote and come.But it in order to realize more extensive wireless coverage, more and more wirelessly connects
Access point is deployed in public domain, thus switching of the mobile terminal between multiple wireless access point just with the movement of user and
Frequently occur.The two layers of handoff procedure occurred between access points are not defined in traditional WLAN standard,
And by wireless network card production firm autonomous Design handover scheme, exactly traditional wireless network card production firm has selected will be single
Thresholding of the received signal strength as triggering switching, and it is relatively fixed, therefore work as terminal with different rate travels multiple
When moving between access point, the triggering handoff threshold fixed seriously limits switching efficiency, then using certainly in handoff procedure
The triggering handoff threshold method of adaptation is just of great significance.
Such as a kind of two layer fast switching methods based on motion prediction of Patent No. 101902794, this method passes through meter
Calculate database in each access point to vehicle distance and calculate pre-switch triggering moment, final choice is apart from the smallest access point
As next-hop access point.Since this method is applied to the car networking network for having car-mounted terminal and roadside node and database
In, application range is narrow, and promotional value is low.
Such as document Qian H, Chen B, Qin X.A Novel Mobility Management Protocol
Supporting Network Seamless Roaming[J].Journal of Networks,2010,5(3):367-374
It is proposed it is a kind of according to rate travel change triggering switching condition algorithm, the algorithm need constantly obtain terminal moving direction with
The angle information of access point calculates the minimum signal strength value under the rate according to rate and angle information and in this, as triggering
Judgment condition.Since acquisition angle information is more difficult in actual scene and accuracy is low, the program exists in popularization
Certain limitation.
In addition, the handoff algorithms based on speed perception being applied in the Vertical Handover of heterogeneous network being capable of adjust automatically touching
Handoff threshold is sent out to adapt to different moving velocity of terminal, effectively improves Vertical Handover efficiency, although algorithm has abandoned mobile end
The speed and coordinate information at end, but the velocity variations of terminal are characterized using history measurement received signal strength data, and with
This predicts the received signal strength information at lower a moment, improves the accurate judgement to triggering switching time, but the algorithm is mainly answered
For switching for two layers between multiple wireless access point in homogeneous network described in this patent simultaneously uncomfortable in heterogeneous network
With.
Summary of the invention
Present invention aim to provide a kind of quick two layer switching method adaptive with rate travel, this method
Triggering handoff threshold can be adaptively adjusted according to the rate travel of terminal, cooperate the auxiliary of distributed channel allocation strategy, reach
To handover delay is reduced, the purpose of switching efficiency is improved.
In order to achieve this, with quick two layers of switching method that rate travel is adaptive designed by the present invention, it is special
Sign is, it the following steps are included:
Step 1: the mobile terminal access rate sensor in wireless network, due to adding for the mobile terminal in wireless network
Speed a characterizes the variation speed of the motion of mobile terminals speed v in wireless network, i.e. a=dv/dt, therefore works as rate and sense
After device obtains the acceleration a of mobile terminal, velocity magnitude is to integrate in certain time interval T to acceleration, can be obtained by following formula:
Step 2: after the rate information of mobile terminal has been obtained by calculation, needing to calculate the corresponding trigger signal of this rate
Intensity threshold, tool is that mobile terminal is from one section there are two the variation of the received signal strength of wireless access point in handover procedure
When moving to the other end, by experience received signal strength respectively by the process to change from weak to strong again that dies down by force, RSSI is definedtriggerFor
Received signal strength threshold value when driver sweep, RSSIrangeFor the corresponding reception signal of effective coverage range of wireless access point
Intensity threshold, dtriggerDistance of the mobile terminal to wireless access point, d when for driver sweeprangeFor the effective of wireless access point
Coverage area, i.e., when the distance of mobile terminal to wireless access point is more than drangeWhen, since signal strength at this time is not enough to mention
Show for what reliable data communication thus occurred disconnecting.Therefore Δ d can indicate the safe distance of handoff procedure:
Δ d=drange-dtrigger
Since the received signal strength RSSI numerical value of mobile terminal under free environments is obeyed:
RSSI=M-10nlogd+Xσ
Wherein, d is distance of the terminal to wireless access point, and M represents the transmission power loss value of near-earth reference distance, and n is
Path loss index, M and n are the parameter with environmental correclation, and when one timing of environment, numerical value is fixed, XσIt is to obey standard deviation
For the stochastic variable of the zero-mean gaussian random distribution of σ, RSSI numerical value is received signal strength indication value；
When mobile terminal detects that its received signal strength reaches RSSItriggerWhen, triggering mobile terminal execution is got over area and is cut
The scanning process changed, and select optimal node to carry out certification and re-association after scanning to neighboring access point selection, if moving
Dynamic terminal with speed v linear uniform motion, mobile terminal from start driver sweep it is successful to re-association when a length of Δ t, then only
There is distance after mobile terminal triggers and switches in handoff procedure linear movement to be less than Δ d and be just able to satisfy to be currently accessed leaving
Handover is completed before the coverage area of point, it may be assumed that
Δd≥v·Δt
Therefore, the received signal strength threshold value RSSI of triggering switching is obtainedtriggerObey following formula:
RSSItrigger≥M-10nlog(drange-v·Δt)
Step 3: when terminal calculates RSSI according to rate traveltriggerAfterwards, it needs to continue to obtain current reception signal
Intensity, due in step 2 in received signal strength expression formula there are the stochastic variable of a zero-mean gaussian random distribution, that is, pass through
There is more apparent shake in the RSSI that network interface card obtains, it is therefore necessary to handle the RSSI value of acquisition, to avoid its wink
False triggering caused by becoming or repeated trigger handover operation, concrete operations process are as follows:
Firstly, establishing the set comprising current rssi measurement value and n-1 historical measurements:
DRSSI{DRSSI0,DRSSI1,DRSSI2···DRSSIn-1}；
Then, the corresponding weight set of n rssi measurement value is established:
W{W0,W1,W2···Wn-1, wherein
Current measurement value is optimized according to the following formula further according to RSSI historical measurements, the reception letter after optimization
Number intensity is DRSSI:
DRSSI=DRSSI{DRSSI0,DRSSI1,DRSSI2···DRSSIn-1}*W{W0,W1,W2···Wn-1}
Step 4: mobile terminal is obtaining the received signal strength threshold value RSSI of triggering switchingtriggerAfter threshold value, in conjunction with
Received signal strength DRSSI after currently optimizing obtained in step 3, the two is compared, if current received signal strength
When not being greater than triggering switching received signal strength threshold value, then current received signal strength is persistently obtained, step 5 is otherwise executed；
Step 5: when mobile terminal triggering executes scanning, needing successively to access two different wireless channels, and exist respectively
Probe requests thereby is sent on two channels, waits reply to be detected, detection replies message as wireless access point to probe request message
Response, message contain the signal strength information of the wireless access point.Mobile terminal is according to wireless on two channels received
The detection of access point replies message, the stronger access point of selection signal intensity, as access point to be connected, i.e. completion rate travel
Adaptive quick two layers of switching.
Step 6: mobile terminal needs to complete certification and re-association after scan phase has selected preferably wireless access point
For process to continue data transmission, process includes link authentication, access authentication, key agreement, re-association and data forwarding, is moved
Dynamic terminal realizes link authentication by open system authentication, only just can connect to wireless access point after completing link authentication,
Hereafter it accesses in network, access and receiving network data, this process need to complete access authentication, which uses and be based on
The access authentication technique of 802.1X, key agreement are that it is applied to the number of communicating pair for negotiating interim conversation key
According to encrypted transmission.
Step 7: when mobile terminal is when executing scan operation, sending and receiving data on other channels can be linked into, therefore with work as
Packet loss phenomenon will occur in data transmission between preceding associated wireless access point, and to solve this problem, terminal is closed to current first
The wireless access point of connection sends service suspension data frame, and after wireless access point receives service suspension data frame, caching will be sent
To the data of terminal, after standby communication terminal is associated with new wireless access point, then by data cached by between wireless access point
Data transmission mechanism is sent to new wireless access point and is transmitted to terminal, realizes that data update and guarantee that reliable data pass
It is defeated, avoid the generation of packet loss phenomenon in handoff procedure.
It is compared with existing technical solution, technical solution provided by this programme has the advantage that
1, relative to the algorithm using RSSI as triggering switching reference standard, the present invention utilizes the history rssi measurement weighted
Value optimizes processing to newest measured value, in this, as reference standard, to avoid being shaken because of RSSI caused by unnecessary switching
Phenomenon.
2, the triggering switch decision threshold algorithm adaptive with rate travel of design dependent on inertial sensor and connects
Signal strength historical data is received, comparing other location-based triggering decision threshold algorithms has higher precision and faster reaction
Speed.
Detailed description of the invention
Fig. 1 is quick two layers of handover network topological structure schematic diagram in the present invention；
Fig. 2 is quick two layers of switching execution flow chart in the present invention；
Fig. 3 is the relational graph of signal strength and distance in switching model of the invention；
Fig. 4 is the relational graph of the first received signal strength and distance in the present invention；
The relational graph of second received signal strength and distance in the present invention of the position Fig. 5；
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
The application scenarios of the method for the present invention are illustrated first in the present embodiment.If Fig. 1 is quick two layers of switching net
Network topological structure schematic diagram, wherein mobile terminal, fixed terminal, monitor node and be all made of laptop, mobile terminal and solid
Determine to carry out two-way communication between terminal, three wireless access point is connected through three cables using router, because wireless access point is same
In same local area network, therefore two layers of switching will occur for when mobile terminal moves in shown wireless coverage.The present invention
Method be ensuring that mobile terminal can fast and efficiently switch operation in different rate travels.
A kind of quick two layer switching method adaptive with rate travel, which is characterized in that it the following steps are included:
Step 1: (rate sensor is added the mobile terminal access rate sensor in wireless network using six axis of low-power consumption
Rate gyro unit instrument meter MPU6050 is realized), since the acceleration a of the mobile terminal in wireless network is characterized in wireless network
The variation speed of motion of mobile terminals speed v, i.e. a=dv/dt, therefore when rate sensor obtains the acceleration a of mobile terminal
Afterwards, velocity magnitude is to integrate in certain time interval T to acceleration, can be obtained by following formula:
Step 2: after the rate information of mobile terminal has been obtained by calculation, needing to calculate the corresponding trigger signal of this rate
Intensity threshold, there are two the variations of the received signal strength of wireless access point to be for tool in handover procedure, shown in Fig. 3, it is mobile eventually
End, by experience received signal strength respectively by the process to change from weak to strong again that dies down by force, is defined from when moving to the other end for one section
RSSItriggerReceived signal strength threshold value when for driver sweep, RSSIrangeIt is corresponding for the effective coverage range of wireless access point
Received signal strength threshold value, dtriggerDistance of the mobile terminal to wireless access point, d when for driver sweeprangeWirelessly to connect
The effective coverage range of access point, i.e., when the distance of mobile terminal to wireless access point is more than drangeWhen, since signal at this time is strong
Degree be not enough to provide reliable data communication thus occur disconnecting show.Therefore Δ d can indicate the safety of handoff procedure
Distance:
Δ d=drange-dtrigger
Since the received signal strength RSSI numerical value of mobile terminal under free environments is obeyed:
RSSI=M-10nlogd+Xσ
Wherein, d is distance of the terminal to wireless access point, and M represents the transmission power loss value of near-earth reference distance, and n is
Path loss index, M and n are the parameter with environmental correclation, and when one timing of environment, numerical value is fixed, XσIt is to obey standard deviation
For the stochastic variable of the zero-mean gaussian random distribution of σ, RSSI numerical value is received signal strength indication value；
When mobile terminal detects that its received signal strength reaches RSSItriggerWhen, triggering mobile terminal execution is got over area and is cut
The scanning process changed, and select optimal node to carry out certification and re-association after scanning to neighboring access point selection, if moving
Dynamic terminal with speed v linear uniform motion, mobile terminal from start driver sweep it is successful to re-association when a length of Δ t, then only
There is distance after mobile terminal triggers and switches in handoff procedure linear movement to be less than Δ d and be just able to satisfy to be currently accessed leaving
Handover is completed before the coverage area of point, it may be assumed that
Δd≥v·Δt
Therefore, the received signal strength threshold value RSSI of triggering switching is obtainedtriggerObey following formula:
RSSItrigger≥M-10nlog(drange-v·Δt)
Step 3: when terminal calculates RSSI according to rate traveltriggerAfterwards, it needs to continue to obtain current reception signal
Intensity, due in step 2 in received signal strength expression formula there are the stochastic variable of a zero-mean gaussian random distribution, that is, pass through
There is more apparent shake in the RSSI that network interface card obtains, as shown in Figure 4, it is therefore necessary to the RSSI value of acquisition is handled,
To avoid false triggering caused by its transition or repeated trigger handover operation, concrete operations process are as follows:
Firstly, establishing the set comprising current rssi measurement value and n-1 historical measurements:
DRSSI{DRSSI0,DRSSI1,DRSSI2···DRSSIn-1}；
Then, the corresponding weight set of n rssi measurement value is established:
W{W0,W1,W2···Wn-1, wherein Wi=W0 i；
Current measurement value is optimized according to the following formula further according to RSSI historical measurements, the reception letter after optimization
Number intensity is DRSSI:
DRSSI=DRSSI{DRSSI0,DRSSI1,DRSSI2···DRSSIn-1}*W{W0,W1,W2···Wn-1}
Received signal strength after optimization is indicated by DRSSI, works as n=10, W0When=0.8, obtain as shown in Figure 5 as a result,
From the figure, it can be seen that the RSSI value after the historical measurement data optimization being weighted makes it more more close to RSSI theoretical value
With confidence level；
Step 4: mobile terminal is obtaining the received signal strength threshold value RSSI of triggering switchingtriggerAfter threshold value, in conjunction with
Received signal strength DRSSI after currently optimizing obtained in step 3, the two is compared, if current received signal strength
When not being greater than triggering switching received signal strength threshold value, then current received signal strength is persistently obtained, step 5 is otherwise executed；
Step 5: when mobile terminal triggering executes scanning, needing successively to access two different wireless channels, and exist respectively
Probe requests thereby is sent on two channels, waits reply to be detected, detection replies message as wireless access point to probe request message
Response, message contain the signal strength information of the wireless access point.Mobile terminal is according to wireless on two channels received
The detection of access point replies message, the stronger access point of selection signal intensity, as access point to be connected, i.e. completion rate travel
Adaptive quick two layers of switching.
Step 6: mobile terminal needs to complete as shown in Figure 2 after scan phase has selected preferably wireless access point
Certification with re-association process with continue data transmission, process include link authentication, access authentication, key agreement, re-association with
And data forwarding, mobile terminal are realized link authentication by open system authentication, could only be connected after completing link authentication
It to wireless access point, hereafter accesses in network, access and receiving network data, this process need to complete access authentication, the process
Using the access authentication technique based on 802.1X, key agreement is applied to it logical for negotiating interim conversation key
Believe the Data Encryption Transmission of both sides.
Step 7: when mobile terminal is when executing scan operation, sending and receiving data on other channels can be linked into, therefore with work as
Packet loss phenomenon will occur in data transmission between preceding associated wireless access point, and to solve this problem, terminal is closed to current first
The wireless access point of connection sends service suspension data frame, and wireless access point receives service and hangs up (service suspend) data
After frame, caching will be sent to the data of terminal, after standby communication terminal is associated with new wireless access point, then will be data cached logical
The data transmission mechanism crossed between wireless access point is sent to new wireless access point and is transmitted to terminal, realizes that data are updated and protected
Reliable data transmission is demonstrate,proved, the generation of packet loss phenomenon in handoff procedure is avoided.
In above-mentioned technical proposal, in the step 1, the mobile terminal in wireless network is passed by USB interface access rate
Sensor.
In the step 1) of above-mentioned technical proposal, the rate sensor module based on acceleration transducer is utilized to acceleration degree
According to being integrated to obtain current rate information, received signal strength information is contained in the physical layer information of wireless network card,
And it is smoothed using weighting historical measurement data to data are received.
In the step 2) of above-mentioned technical proposal, the side of triggering switching received signal strength threshold parameter is calculated by rate information
Method is utilized the relationship of distance and received signal strength in log-distance path loss model model, while converting distance to and moving
The dynamic related parameter of rate is realized the direct correlation of rate Yu received signal strength threshold parameter with this, and then completed to shifting
Move the adaptive of rate.
In the step 5) of above-mentioned technical proposal, plan is distributed since wireless access point each in network uses distributed channel
Slightly, has channel isolation between neighbor radio access points, therefore mobile terminal is only used on known two channels and detects, significantly
Shorten scanning delay.
In the step 6) of above-mentioned technical proposal, reliable authentication process is by link authentication, access authentication and key agreement three
A step composition.
In the step 7) of above-mentioned technical proposal, when mobile terminal triggering is scanned operation, access point associated with it will
Caching will be sent to the data of mobile terminal, and when completing re-association operation, new access point obtains caching from old access point
Data are simultaneously forwarded to mobile terminal again, avoid the packet loss phenomenon in handoff procedure.
In above-mentioned technical proposal, normalization weight is distributed to received signal strength historical measurements, and join according to the weight
Several received signal strengths to newest measurement optimize, and it is big that the result after optimization can improve received signal strength fluctuating range
The problem of, make it as handover trigger parameter with more confidence level.
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
Claims (4)
1. a kind of quick two layer switching method adaptive with rate travel, which is characterized in that it the following steps are included:
Step 1: the mobile terminal access rate sensor in wireless network, due to the acceleration of the mobile terminal in wireless network
A characterizes the variation speed of the motion of mobile terminals speed v in wireless network, i.e. a=dv/dt, therefore when rate sensor obtains
After the acceleration a for obtaining mobile terminal, velocity magnitude is to integrate in certain time interval T to acceleration, can be obtained by following formula:
Step 2: after the rate information of mobile terminal has been obtained by calculation, needing to calculate the corresponding trigger signal intensity of this rate
Threshold value, there are two the variations of the received signal strength of wireless access point to be for tool in handover procedure, and mobile terminal is from an end motion
When to the other end, experience received signal strength RSSI will be defined by the process to change from weak to strong again that dies down by force respectivelytriggerFor triggering
Received signal strength threshold value when scanning, RSSIrangeFor the corresponding received signal strength of effective coverage range of wireless access point
Threshold value, dtriggerDistance of the mobile terminal to wireless access point, d when for driver sweeprangeFor effective covering of wireless access point
Range, i.e., when the distance of mobile terminal to wireless access point is more than drangeWhen, due to signal strength at this time be not enough to provide can
The phenomenon that data communication leaned on thus disconnects, therefore Δ d can indicate the safe distance of handoff procedure:
Δ d=drange-dtrigger
Since the received signal strength RSSI numerical value of mobile terminal under free environments is obeyed:
RSSI=M-10n logd+Xσ
Wherein, d is distance of the terminal to wireless access point, and M represents the transmission power loss value of near-earth reference distance, and n is path
Loss index, M and n are the parameter with environmental correclation, and when one timing of environment, numerical value is fixed, XσIt is to obey standard deviation as σ
The stochastic variable of zero-mean gaussian random distribution, RSSI numerical value are received signal strength indication value；
When mobile terminal detects that its received signal strength reaches RSSItriggerWhen, triggering mobile terminal execution handover is swept
Process is retouched, and selects optimal node to carry out certification and re-association after scanning to neighboring access point selection, if mobile terminal
With speed v linear uniform motion, mobile terminal a length of Δ t when successful to re-association from beginning driver sweep, then only when shifting
Distance after dynamic terminal triggering switching in handoff procedure linear movement is just able to satisfy less than Δ d is leaving covering for current access point
Handover is completed before lid range, it may be assumed that
Δd≥v·Δt
Therefore, the received signal strength threshold value RSSI of triggering switching is obtainedtriggerObey following formula:
RSSItrigger≥M-10nlog(drange-v·Δt)
Step 3: when terminal calculates RSSI according to rate traveltriggerAfterwards, it needs to continue to obtain current received signal strength,
Due in step 2 in received signal strength expression formula there are the stochastic variable of a zero-mean gaussian random distribution, that is, pass through network interface card
There is more apparent shake in the RSSI of acquisition, it is therefore necessary to handle the RSSI value of acquisition, lead to avoid its transition
The false triggering of cause or repeated trigger handover operation, concrete operations process are as follows:
Firstly, establishing the set comprising current rssi measurement value and n-1 historical measurements:
DRSSI{DRSSI0,DRSSI1,DRSSI2···DRSSIn-1}；
Then, the corresponding weight set of n rssi measurement value is established:
W{W0,W1,W2···Wn-1, wherein
Current measurement value is optimized according to the following formula further according to RSSI historical measurements, the received signal strength after optimization
For DRSSI:
DRSSI=DRSSI{DRSSI0,DRSSI1,DRSSI2···DRSSIn-1}*W{W0,W1,W2···Wn-1}
Step 4: mobile terminal is obtaining the received signal strength threshold value RSSI of triggering switchingtriggerAfter threshold value, in conjunction with step 3
Obtained in currently optimize after received signal strength DRSSI, the two is compared, if current received signal strength is not greater than
When triggering switching received signal strength threshold value, then current received signal strength is persistently obtained, step 5 is otherwise executed；
Step 5: when mobile terminal triggering executes scanning, needing successively to access two different wireless channels, and respectively at two
Probe requests thereby is sent on channel, waits reply to be detected, detection replies message the response for wireless access point to probe request message,
Message contains the signal strength information of the wireless access point, and mobile terminal is according to wireless access point on two channels received
Detection reply message, the stronger access point of selection signal intensity, as access point to be connected, i.e. completion rate travel is adaptive
It is quick two layers switching.
2. the quick two layer switching method adaptive with rate travel according to claim 1, it is characterised in that: described
Further include step 6 after step 5: mobile terminal after scan phase has selected preferably wireless access point, need to complete certification with
For re-association process to continue data transmission, process includes link authentication, access authentication, key agreement, re-association and data
Forwarding, mobile terminal realize link authentication by open system authentication, only just can connect to after completing link authentication wireless
Hereafter access point accesses in network, access and receiving network data, this process need to complete access authentication, which uses
Access authentication technique based on 802.1X, key agreement are that it is applied to communicating pair for negotiating interim conversation key
Data Encryption Transmission.
3. the quick two layer switching method adaptive with rate travel according to claim 2, it is characterised in that: described
Further include step 7 after step 6: when mobile terminal is when executing scan operation, sending and receiving data on other channels, terminal can be linked into
Service suspension data frame is sent to current associated wireless access point first, after wireless access point receives service suspension data frame,
Caching will be sent to the data of terminal, after standby communication terminal is associated with new wireless access point, then by data cached pass through nothing
Data transmission between line access point is sent to new wireless access point and is transmitted to terminal.
4. the quick two layer switching method adaptive with rate travel according to claim 1, it is characterised in that: described
In step 1, the mobile terminal in wireless network passes through USB interface access rate sensor.
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| EP3286951B1 (en) * | 2016-03-31 | 2019-06-26 | Hewlett-Packard Enterprise Development LP | Calculation of an equivalent isotropic radiated power (eirp) of a reference access point (ap) in a network when predetermined conditions are satisfied |
| CN108235384B (en) | 2016-12-12 | 2020-10-16 | 华为技术有限公司 | Wireless network switching method and device |
| CN106604280A (en) * | 2017-01-06 | 2017-04-26 | 国网新疆电力公司电力科学研究院 | Handover method of wireless network |
| CN111211823B (en) * | 2018-11-22 | 2023-10-17 | 北京小米松果电子有限公司 | Method and device for switching transmitting antenna, storage medium and electronic equipment |
| CN113253725B (en) * | 2021-05-11 | 2023-06-27 | 北京京东乾石科技有限公司 | Robot path planning method and device, storage medium and electronic equipment |
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| CN103999511A (en) * | 2011-12-08 | 2014-08-20 | 苹果公司 | Mechanisms to improve mobile device roaming in wireless networks |
| CN103596231A (en) * | 2013-06-20 | 2014-02-19 | 北京邮电大学 | Vertical switching method and vertical switching device |
| CN103686896A (en) * | 2013-12-12 | 2014-03-26 | 广州市地下铁道总公司 | Method for switching wireless access points and terminal |
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| CN105916180A (en) | 2016-08-31 |
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