CN107889181B - Switching method, device and the train of wireless access point - Google Patents
Switching method, device and the train of wireless access point Download PDFInfo
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- CN107889181B CN107889181B CN201710537047.5A CN201710537047A CN107889181B CN 107889181 B CN107889181 B CN 107889181B CN 201710537047 A CN201710537047 A CN 201710537047A CN 107889181 B CN107889181 B CN 107889181B
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Classifications
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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
Abstract
The invention discloses a kind of switching method of wireless access point, device and trains.Wherein method includes: multiple wireless aps to be connected that detection is located at around vehicle-mounted AP；Determine that currently there is the current of communication connection with vehicle-mounted AP connects wireless aps in link setup；The first signal strength indication of each wireless aps to be connected in preset time is obtained, and obtains the current second signal intensity value for connecing wireless aps in link setup in preset time；The first time window factor of each wireless aps to be connected is calculated separately according to first signal strength indication；The second time window factor of wireless aps currently is connect in link setup according to the calculating of second signal intensity value；According to the first time window factor of the second time window factor and each wireless aps to be connected, target wireless aps to be connected are determined in wireless aps wait connect from multiple；Vehicle-mounted AP is switched in target wireless aps to be connected.This method can effectively avoid club after line AP signal coverage enhancement from the ping-pong problem of car-ground radio AP switching occur.
Description
Technical field
The present invention relates to wireless communication field more particularly to a kind of switching methods of wireless access point, device and train.
Background technique
Vehicle-ground wireless communication in Urban Rail Transit Signal and communication system usually utilizes WLAN (Wireless
Local Area Network, WLAN) or the communication standards such as LTE (Long Term Evolution, long term evolution),
It is established a series of wireless aps (Access Point, access point) in trackside, each wireless aps point of trackside passes through communications optical cable
Terrestrial communication networks are formed, while setting vehicle-mounted wireless access point AP is as mobile terminal ON TRAINS, train is in operational process
In by between the AP of vehicle-mounted AP and trackside establish wirelessly communicate, to realize the function of vehicle-ground wireless communication.
In the related technology, train is in moving process, the reality of the switching between wireless access point in vehicle-ground wireless communication
Existing process is generally as follows: vehicle-mounted AP is judged by detecting the network information for multiple wireless access point APs that trackside is closer
Currently whether the signal strength with associated first AP of website is lower than network signal intensity threshold value, if so, in MAC
The MAC of each AP is searched in multiple AP in (Media Access Control, media access control) address mapping table
The corresponding geographical location information in location, and according to the corresponding geographical location information of each AP determine vehicle-mounted AP in moving process with its
Geographical location multiple 2nd AP close to each other, and it is strong that website from the first AP is switched to network signal in multiple 2nd AP
Spend strongest 2nd AP.
But presently, there are the problem of be that the bend of current track traffic above ground portion is more and more, route operation after rail
Increased building is also more and more near road, during switching AP using traditional wireless access point switching method, due to
The complexity of on-board running route ambient enviroment and the uncertainty of external interference signal, using threshold value or dynamic point threshold value come
The foundation condition switched is done, in the case where jump, the ping-pong of switching is easy to appear in signal strength, causes repeatedly
Switching reduces the stability of switching and increases the probability of delay and the error of wireless communication.
Summary of the invention
The purpose of the present invention is intended to solve above-mentioned one of technical problem at least to a certain extent.
For this purpose, the first purpose of this invention is to propose a kind of switching method of wireless access point.This method can have
Effect avoids club after line AP signal coverage enhancement from the ping-pong problem of car-ground radio AP switching occur, substantially reduces switching
Time, and improve the reliability of signal link.
Second object of the present invention is to propose a kind of switching device of wireless access point.
Third object of the present invention is to propose a kind of train.
To achieve the goals above, the switching method for the wireless access point that first aspect present invention embodiment proposes, comprising:
Detection is located at multiple wireless access point APs to be connected around vehicle-mounted wireless access point AP；Determination currently connects with the onboard wireless
Wireless aps are connect there is the current of communication connection in link setup in access point AP；Obtain first of each wireless aps to be connected in preset time
Signal strength indication, and obtain the second signal intensity value that wireless aps are currently connect in link setup in the preset time；According to
First signal strength indication of each wireless aps to be connected in the preset time calculates separately each wireless aps to be connected
The first time window factor；Second time window that wireless aps are currently connect in link setup is calculated according to the second signal intensity value
The factor；According to the first time window factor of the second time window factor and each wireless aps to be connected, from the multiple
Target wireless aps to be connected are determined in wireless aps wait connect；The vehicle-mounted wireless access point AP is switched to the target to wait connecting
It connects in wireless aps.
The switching method of wireless access point according to an embodiment of the present invention, the method filtered using the time window factor, can be with
It solves loop wire Straddle type monorail reliably to switch under lesser turning radius, effectively avoids wireless aps signal coverage enhancement
There is the ping-pong problem of car-ground radio AP switching in club afterwards, substantially reduces the time of switching, and improve signal link
Reliability.
To achieve the goals above, the switching device for the wireless access point that second aspect of the present invention embodiment proposes, comprising:
Detection module, for detecting the multiple wireless access point APs to be connected being located at around vehicle-mounted wireless access point AP；First determines mould
Block, for determining that currently there is the current of communication connection with the vehicle-mounted wireless access point AP connects wireless aps in link setup；Obtain mould
Block for obtaining the first signal strength indication of each wireless aps to be connected in preset time, and obtains in the preset time
The second signal intensity value that wireless aps are currently connect in link setup；First computing module, for according in the preset time
Each wireless aps to be connected the first signal strength indication, calculate separately the first time windows of each wireless aps to be connected because
Son；Second computing module, it is described currently when link setup connects the second of wireless aps for being calculated according to the second signal intensity value
Between the window factor；Second determining module, for according to the first of the second time window factor and each wireless aps to be connected
The time window factor determines target wireless aps to be connected wait connect from the multiple in wireless aps；Switching module, being used for will be described
Vehicle-mounted wireless access point AP is switched in target wireless aps to be connected.
The switching device of wireless access point according to an embodiment of the present invention, the method filtered using the time window factor, can be with
It solves loop wire Straddle type monorail reliably to switch under lesser turning radius, effectively avoids wireless aps signal coverage enhancement
There is the ping-pong problem of car-ground radio AP switching in club afterwards, substantially reduces the time of switching, and improve signal link
Reliability.
To achieve the goals above, the train that third aspect present invention embodiment proposes is provided at least on the train
One vehicle-mounted wireless access point AP, the vehicle-mounted wireless access point AP are for executing nothing described in first aspect present invention embodiment
The switching method of line access point.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is the flow chart of the switching method of wireless access point according to an embodiment of the invention；
Fig. 2 is the exemplary diagram of the time window factor model of trackside according to an embodiment of the present invention wireless aps to be connected；
Fig. 3 is the example for the time window factor model that trackside according to an embodiment of the present invention currently connects wireless aps in link setup
Figure；
Fig. 4 is the flow chart of the switching method of wireless access point in accordance with another embodiment of the present invention；
Fig. 5 is the exemplary diagram of car-ground radio AP link according to an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of the switching device of wireless access point according to an embodiment of the invention；
Fig. 7 is the structural schematic diagram of the switching device of wireless access point in accordance with another embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the switching method, device and train of the wireless access point of the embodiment of the present invention are described.
Fig. 1 is the flow chart of the switching method of wireless access point according to an embodiment of the invention.It should be noted that
The switching method of the wireless access point of the embodiment of the present invention can be applied to the switching device of the wireless access point of the embodiment of the present invention.
Wherein, which can be configured in train.For example, the switching device can be the vehicle-mounted line access point being set in train
AP.In other words, the switching method of the embodiment of the present invention wireless access point can be described from the vehicle-mounted side line access point AP.
As shown in Figure 1, the switching method of the wireless access point may include:
S110, detection are located at multiple wireless access point APs to be connected around vehicle-mounted wireless access point AP.
It specifically, can be wide to transmission around vehicle-mounted wireless access point AP by way of broadcast in train moving process
Information is broadcast, the wireless aps around vehicle-mounted wireless access point AP can feed back corresponding information when receiving the broadcast message, lead to
The information of the feedback is crossed you can learn which wireless access point AP is currently located at around vehicle-mounted wireless access point AP has can be connected
It connects.
S120 determines that currently there is the current of communication connection with vehicle-mounted wireless access point AP connects wireless aps in link setup.
Specifically, it may be determined that it is current whether with the presence of with vehicle-mounted wireless access point AP to communicate to connect wireless aps, if so, then general
The wireless aps are used as and currently connect wireless aps in link setup.
S130, obtains the first signal strength indication of each wireless aps to be connected in preset time, and obtains preset time
The interior current second signal intensity value that wireless aps are connect in link setup.
Specifically, RSSI (the Received Signal of each wireless aps to be connected in preset time can be obtained respectively
Strength Indication, the instruction of received signal intensity) value, and obtain in preset time current connects wirelessly in link setup
The RSSI value of AP.Wherein, in an embodiment of the present invention, which can be is determined according to the actual application,
For example, the preset time can be 50 milliseconds.
S140, according to the first signal strength indication of each wireless aps to be connected in preset time, calculate separately it is each to
Connect the first time window factor of wireless aps.
Specifically, in one embodiment of the invention, for each wireless aps to be connected, using the preset time
The first signal strength indication in preset time is fitted to first straight line equation by window function, and calculates the first of first straight line equation
Slope KF, and by first slope KFAs the first time window factor.Wherein, in an embodiment of the present invention, when above-mentioned preset
Between window function can be expressed as follows:
Wherein, y is the signal strength indication in preset time, and Δ t is preset time, and x is current time, and k is slope, and b is
The intercept of time window function on the y axis.
More specifically, the preset time period can be chosen multiple moment, wherein each for each wireless aps to be connected
Duration between moment is identical, then, it is determined that signal strength indication corresponding to each moment, and utilize preset time window letter
Number carries out Linear Quasi using multiple moment as signal strength indication corresponding to abscissa, multiple moment as ordinate
It closes, obtains corresponding linear equation, later, the slope of the linear equation can be found out, and can be by the slope should nothing be connected
The first time window factor of line AP.
It is appreciated that train, in driving into some region, the wireless aps being located in the region should be wireless aps to be connected, and
Since these wireless aps to be connected are will to establish connection with the vehicle-mounted AP in train, i.e., these companies of waiting in preset time period
The signal strength indication for connecing wireless aps should be gradually increased, so, the time window factor for calculating the wireless aps to be connected should be
Positive number.For example, as shown in Fig. 2, being the time window factor model of trackside wireless aps to be connected, it can be seen that the preset time period
The signal strength indication of interior wireless aps to be connected is gradually increased, so the time window factor of calculated wireless aps to be connected
(slope K i.e. as shown in Figure 2F) it is positive number.
S150 currently connects the second time window factor of wireless aps in link setup according to the calculating of second signal intensity value.
Specifically, in one embodiment of the invention, it will be in preset time using preset time window function
Second signal intensity value is fitted to second straight line equation, and calculates the second slope of second straight line equation, and by the second slope
As the second time window factor.Wherein, in an embodiment of the present invention, above-mentioned preset time window function can be expressed as follows:
Wherein, y is the signal strength indication in preset time, and Δ t is preset time, and x is current time, and k is slope, and b is
The intercept of time window function on the y axis.
More specifically, the preset time period can be chosen by multiple moment, wherein the duration between each moment is identical, so
Afterwards, it determines signal strength indication corresponding to each moment, and utilizes preset time window function, using multiple moment as horizontal seat
Signal strength indication corresponding to mark, multiple moment carries out linear fit, obtains corresponding linear equation as ordinate, it
Afterwards, the slope K of the linear equation can be found outB, and by the slope KBThe second time window of wireless aps can be currently connect in link setup for this
The factor.
It is appreciated that train is in the process of moving, on the wireless aps that the vehicle-mounted AP in train is currently connected may be
When then train is driven into next region at this time, there is current connecing in link setup of linking with vehicle-mounted Ap in the wireless aps in one region
The signal strength indication of wireless aps can gradually become smaller, so, it is general to calculate the time window factor for currently connecing wireless aps in link setup
For negative.For example, as shown in figure 3, the time window factor model of wireless aps is currently connect in link setup for trackside, it can be seen that this is pre-
If the current signal strength indication for connecing wireless aps in link setup in the period be it is gradually smaller, so calculated currently in link setup
Connect the time window factor (slope K i.e. as shown in Figure 3 of wireless apsB) it is negative.
S160, according to the first time window factor of the second time window factor and each wireless aps to be connected, from multiple to even
It connects and determines target wireless aps to be connected in wireless aps.
Specifically, whether the second time window factor can be judged according to the first time window factor of each wireless aps to be connected
Meet the switching condition of wireless access point, if satisfied, then determining target wireless aps to be connected in wireless aps wait connect from multiple.
Wherein, in an embodiment of the present invention, switching condition for meeting wireless access point can include: the second time window factor is negative
Value；And second the time window factor absolute value be less than each wireless aps to be connected the first time window factor average value.
Specifically, in one embodiment of the invention, can determine whether the second time window factor is negative value, if the
The two time window factors are negative value, then further judge whether the absolute value of the second time window factor is less than each wireless aps to be connected
The first time window factor average value, if so, from it is multiple wait connect chosen in wireless aps have maximum first time window because
The wireless aps to be connected of son, and will have the wireless aps to be connected of the maximum first time window factor to wait connecting wirelessly as target
AP。
S170 switches to vehicle-mounted wireless access point AP in target wireless aps to be connected.
Specifically, from multiple wait after connecting and determining target wireless aps to be connected in wireless aps, can be by onboard wireless
The website of AP is currently switched in target wireless aps to be connected in the wireless aps that link setup connects from described, with realizing vehicle nothing
The process of wireless access point switching in line communication.
It is appreciated that when network is very poor or onboard wireless AP around there is no wireless access point when, may result in vehicle-mounted
Wireless aps are attached currently without any wireless access point with trackside, therefore, also need to consider it is this in special circumstances, how
Realize the switching of wireless access point.Optionally, in one embodiment of the invention, it is determining currently and vehicle-mounted wireless access point
There is the current before link setup connects wireless aps of communication connection in AP, as shown in figure 4, this wirelessly connects on the basis of as shown in Figure 1
The switching method of access point may also include that
S410, it is judged whether or not there are the first wireless aps of communication connection with vehicle-mounted wireless access point AP.
S420 if so, the first wireless aps are determined as currently to connect wireless aps in link setup, and continues to execute step S130.
S430, if it is not, then obtaining the first signal strength indication of each wireless aps to be connected in preset time respectively.
S440, according to the first signal strength indication of each wireless aps to be connected in preset time, calculate separately it is each to
Connect the first time window factor of wireless aps.
S450 has the maximum first time window factor wait connect to choose in wireless aps from multiple according to the first time window factor
Wireless aps to be connected.
S460 will have the wireless aps to be connected of the maximum first time window factor as target wireless aps to be connected.
That is, being not necessarily to when judging currently without the wireless aps that there is communication connection with vehicle-mounted wireless access point AP
Consider the problems of currently in the signal strength for the wireless aps for building connection, but can directly calculate the multiple wireless aps to be connected
The first time window factor, and according to the first time window factor from it is multiple wait connect chosen in wireless aps have it is maximum at the first time
The wireless aps to be connected of the window factor, and there are the wireless aps to be connected of the maximum first time window factor to wait connecting as target this
Wireless aps directly determine target wireless aps to be connected from multiple wireless aps to be connected, and then by vehicle-mounted wireless access point
AP is switched in target wireless aps to be connected, to realize the process of the switching of the wireless access point in vehicle-ground wireless communication.
For example, it is assumed that the switching method of the wireless access point of the embodiment of the present invention is applied to the signal system of rail traffic
In system, wherein onboard wireless AP is arranged in the headstock and the tailstock of train, and trackside wireless aps are arranged in the unilateral side of track circuit or two sides
Network.In the moving process of train, onboard wireless AP generally detects 3 or 4 trackside wireless aps, such as car-ground radio in Fig. 5
Shown in AP link, in the process of moving, onboard wireless AP and trackside wireless aps 1 have built up link to train, and onboard wireless P is utilized
The current second signal intensity value that wireless aps are connect in link setup in time window function and preset time calculates currently building in real time
Link the second time window factor K of wireless apsB, meanwhile, using each wireless wait connect in time window function and preset time
The first signal strength indication of AP calculates wireless aps 2, wireless aps 3, the first time window factor of wireless aps 4, i.e. K in real timeF2、KF3、
KF4。
Then, judge the second time window factor KBFor negative value, and the second time window factor KBAbsolute value be less than wireless aps 2,
The each time window factor (i.e. K of wireless aps 3, wireless aps 4F2、KF3、KF4) average value, at this point, can be from wireless aps 2, wireless
That maximum wireless aps of time window factor values are found out in AP3, wireless aps 4, and wait connecting wirelessly using the wireless aps as target
AP, and onboard wireless AP is switched in target wireless aps to be connected.Have as a result, in the environment of vehicle driving stronger with frequency
When interference or vehicle are passing through lesser bend, the wireless aps of trackside will appear the variation of great-jump-forward, and the embodiment of the present invention can
It is once filtered by the trackside wireless aps that time window factor pair will establish connection, avoids table tennis effect when connection
It answers, enhances the validity of switching AP.
To sum up, the purpose of the present invention is the actual demands of vehicle-ground wireless communication in comprehensive current city rail traffic, especially
It is the actual demand for loop wire straddle-type monorail, proposes a kind of switching side of wireless access point based on the time window factor
Method.The switching method of the wireless access point of the embodiment of the present invention, using the time window factor filter method, can solve loop wire across
Sitting posture single track reliably switches under lesser turning radius, and club occurs after effectively avoiding wireless aps signal coverage enhancement
The ping-pong problem of car-ground radio AP switching, substantially reduces the time of switching, and improve the reliability of signal link.
Corresponding with the switching method of wireless access point that above-mentioned several embodiments provide, a kind of embodiment of the invention is also
A kind of switching device of wireless access point is provided, due to wireless access point provided in an embodiment of the present invention switching device with it is above-mentioned
The switching method for the wireless access point that several embodiments provide is corresponding, therefore the reality of the switching method in aforementioned wireless access point
The mode of applying is also applied for the switching device of wireless access point provided in this embodiment, is not described in detail in the present embodiment.Fig. 6
It is the structural schematic diagram of the switching device of wireless access point according to an embodiment of the invention.As shown in fig. 6, the wireless access
Point switching device may include: detection module 610, the first determining module 620, obtain module 630, the first computing module 640,
Second computing module 650, the second determining module 660 and switching module 670.
Specifically, what detection module 610 was used to detect around the vehicle-mounted wireless access point AP multiple wirelessly connects wait connect
Access point AP.
Currently there is the current in link setup of communication connection with vehicle-mounted wireless access point AP for determining in the first determining module 620
Connect wireless aps.
The first signal strength indication that module 630 is used to obtain each wireless aps to be connected in preset time is obtained, and is obtained
Take the current second signal intensity value that wireless aps are connect in link setup in preset time.
First computing module 640 is used for the first signal strength indication according to each wireless aps to be connected in preset time,
Calculate separately the first time window factor of each wireless aps to be connected.Specifically, in one embodiment of the invention, first
Computing module 640 is strong by the first signal in preset time using preset time window function for each wireless aps to be connected
Angle value is fitted to first straight line equation, and calculates the first slope of first straight line equation, and when using first slope as first
Between the window factor.Wherein, in an embodiment of the present invention, above-mentioned preset time window function representation is as follows:
Wherein, y is the signal strength indication in preset time, and Δ t is preset time, and x is current time, and k is slope, and b is
The intercept of time window function on the y axis.
Second computing module 650 is used to currently connect the second time of wireless aps in link setup according to the calculating of second signal intensity value
The window factor.Specifically, in one embodiment of the invention, the second computing module 650 can utilize preset time window function
Second signal intensity value in preset time is fitted to second straight line equation, and calculates the second slope of second straight line equation,
And using the second slope as the second time window factor.Wherein, in an embodiment of the present invention, above-mentioned preset time window function
It is expressed as follows:
Wherein, y is the signal strength indication in preset time, and Δ t is preset time, and x is current time, and k is slope, and b is
The intercept of time window function on the y axis.
Second determining module 660 be used for according to the first time window of the second time window factor and each wireless aps to be connected because
Son determines target wireless aps to be connected wait connect from multiple in wireless aps.As an example, as shown in fig. 7, this second really
Cover half block 660 may include: the first judging unit 661, second judgment unit 662, selection unit 663 and determination unit 664.
Wherein, the first judging unit 661 is for judging whether the second time window factor is negative value.Second judgment unit 662
It is each to even for when the second time window factor is negative value, further judging whether the absolute value of the second time window factor is less than
Connect the average value of the first time window factor of wireless aps.Selection unit 663 is used to be less than in the absolute value of the second time window factor
When each average value of the first time window factor wait connect wireless aps, have maximum the wait connect to choose in wireless aps from multiple
The wireless aps to be connected of the one time window factor.The nothing to be connected that determination unit 664 is used to have the maximum first time window factor
Line AP is as target wireless aps to be connected.
Switching module 670 is for switching to vehicle-mounted wireless access point AP in target wireless aps to be connected.
The switching device of wireless access point according to an embodiment of the present invention can solve loop wire Straddle type monorail lesser
Reliably switch under turning radius, car-ground radio AP switching occurs in club after effectively avoiding wireless aps signal coverage enhancement
Ping-pong problem, substantially reduces the time of switching, and improves the reliability of signal link.
In order to realize above-described embodiment, the invention also provides a kind of train, at least one vehicle may be provided on the train
Carry wireless access point AP, wherein vehicle-mounted wireless access point AP is for executing nothing described in any of the above-described a embodiment of the present invention
The switching method of line access point.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discussed suitable
Sequence, including according to related function by it is basic simultaneously in the way of or in the opposite order, Lai Zhihang function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
Expression or logic and/or step described otherwise above herein in flow charts, for example, being considered use
In the order list for the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system, including the system of processor or other can be held from instruction
The instruction fetch of row system, device or equipment and the system executed instruction) it uses, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium ", which can be, any may include, stores, communicates, propagates or pass
Defeated program is for instruction execution system, device or equipment or the dress used in conjunction with these instruction execution systems, device or equipment
It sets.The more specific example (non-exhaustive list) of computer-readable medium include the following: there is the electricity of one or more wirings
Interconnecting piece (electronic device), portable computer diskette box (magnetic device), random access memory (RAM), read-only memory
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, computer-readable medium can even is that the paper that can print described program on it or other are suitable
Medium, because can then be edited, be interpreted or when necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of column technology or their combination are realized: having a logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are understood that realize all or part of step that above-described embodiment method carries
It suddenly is that relevant hardware can be instructed to complete by program, the program can store in a kind of computer-readable storage medium
In matter, which when being executed, includes the steps that one or a combination set of embodiment of the method.
It, can also be in addition, each functional unit in each embodiment of the present invention can integrate in a processing module
It is that each unit physically exists alone, can also be integrated in two or more units in a module.Above-mentioned integrated mould
Block both can take the form of hardware realization, can also be realized in the form of software function module.The integrated module is such as
Fruit is realized and when sold or used as an independent product in the form of software function module, also can store in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only memory, disk or CD etc..Although having been shown and retouching above
The embodiment of the present invention is stated, it is to be understood that above-described embodiment is exemplary, and should not be understood as to limit of the invention
System, those skilled in the art can be changed above-described embodiment, modify, replace and become within the scope of the invention
Type.
Claims (9)
1. a kind of switching method of wireless access point, which comprises the following steps:
Detection is located at multiple wireless access point APs to be connected around vehicle-mounted wireless access point AP；
Determine that currently there is the current of communication connection with the vehicle-mounted wireless access point AP connects wireless aps in link setup；
The first signal strength indication of each wireless aps to be connected in preset time is obtained, and obtains the institute in the preset time
It states and currently connects the second signal intensity value of wireless aps in link setup；
According to the first signal strength indication of each wireless aps to be connected in the preset time, calculate separately described each to even
Connect the first time window factor of wireless aps；
The second time window factor that wireless aps are currently connect in link setup is calculated according to the second signal intensity value；
Judge whether the second time window factor is negative value；
If the second time window factor is negative value, further judge whether the absolute value of the second time window factor is small
In the average value of the first time window factor of each wireless aps to be connected；
If so, from the multiple wait connect the wireless aps to be connected chosen in wireless aps and there is the maximum first time window factor；
Using the wireless aps to be connected with the maximum first time window factor as target wireless aps to be connected；
The vehicle-mounted wireless access point AP is switched in target wireless aps to be connected；
Wherein, currently there is the current of communication connection with the vehicle-mounted wireless access point AP in the determination and connect wireless aps in link setup
Before, further includes:
It is judged whether or not there are the first wireless aps of communication connection with the vehicle-mounted wireless access point AP；
If so, first wireless aps are determined as described currently to connect wireless aps in link setup；
If it is not, then obtaining the first signal strength indication of each wireless aps to be connected in the preset time respectively；
According to the first signal strength indication of each wireless aps to be connected in the preset time, calculate separately described each to even
Connect the first time window factor of wireless aps；
There is the maximum first time window factor wait connect to choose in wireless aps from the multiple according to the first time window factor
Wireless aps to be connected；
Using the wireless aps to be connected with the maximum first time window factor as target wireless aps to be connected.
2. the switching method of wireless access point as described in claim 1, which is characterized in that described according to each in preset time
First signal strength indication of a wireless aps to be connected calculates separately the first time window factor of each wireless aps to be connected,
Include:
For each wireless aps to be connected, using preset time window function by the first signal strength indication in the preset time
It is fitted to first straight line equation；
The first slope of the first straight line equation is calculated, and using the first slope as the first time window factor.
3. the switching method of wireless access point as described in claim 1, which is characterized in that described according to second signal intensity value
Calculate the second time window factor that wireless aps are currently connect in link setup, comprising:
The second signal intensity value in the preset time is fitted to second straight line equation using preset time window function；
The second slope of the second straight line equation is calculated, and using second slope as the second time window factor.
4. the switching method of wireless access point as claimed in claim 2 or claim 3, which is characterized in that the preset time window letter
Number is expressed as follows:
Wherein, y is the signal strength indication in the preset time, and Δ t is the preset time, and x is current time, and k is slope,
B is the intercept of the time window function on the y axis.
5. a kind of switching device of wireless access point characterized by comprising
Detection module, for detecting the multiple wireless access point APs to be connected being located at around vehicle-mounted wireless access point AP；
First determining module, for determining that currently there is the current of communication connection with the vehicle-mounted wireless access point AP connects in link setup
Wireless aps；
Module is obtained, for obtaining the first signal strength indication of each wireless aps to be connected in preset time, and described in acquisition
The second signal intensity value that wireless aps are currently connect in link setup in preset time；
First computing module divides for the first signal strength indication according to each wireless aps to be connected in the preset time
The first time window factor of each wireless aps to be connected is not calculated；
Second computing module, it is described currently when link setup connects the second of wireless aps for being calculated according to the second signal intensity value
Between the window factor；
Second determining module, second determining module include: the first judging unit, for judging the second time window factor
It whether is negative value；
Second judgment unit, for the second time window factor be negative value when, further judge second time window because
Whether the absolute value of son is less than the average value of the first time window factor of each wireless aps to be connected；
Selection unit, when being less than each first wait connect wireless aps for the absolute value in the second time window factor
Between the window factor average value when, from it is the multiple wait connect chosen in wireless aps have the maximum first time window factor wait connect
Wireless aps；
Determination unit, it is wireless for waiting connecting using the wireless aps to be connected with the maximum first time window factor as target
AP；
Switching module, for switching to the vehicle-mounted wireless access point AP in target wireless aps to be connected；
Wherein, it is judged whether or not there are the first wireless aps of communication connection with the vehicle-mounted wireless access point AP；If so,
First wireless aps are determined as described currently to connect wireless aps in link setup；If it is not, then being obtained in the preset time respectively
First signal strength indication of each wireless aps to be connected；According to first of each wireless aps to be connected in the preset time the letter
Number intensity value, calculates separately the first time window factor of each wireless aps to be connected；According to the first time window factor
From the multiple wait connect the wireless aps to be connected chosen in wireless aps and there is the maximum first time window factor；Described will have most
The wireless aps to be connected of the big first time window factor are as target wireless aps to be connected.
6. the switching device of wireless access point as claimed in claim 5, which is characterized in that first computing module is specifically used
In:
For each wireless aps to be connected, using preset time window function by the first signal strength indication in the preset time
It is fitted to first straight line equation；
The first slope of the first straight line equation is calculated, and using the first slope as the first time window factor.
7. the switching device of wireless access point as claimed in claim 5, which is characterized in that second computing module is specifically used
In:
The second signal intensity value in the preset time is fitted to second straight line equation using preset time window function；
The second slope of the second straight line equation is calculated, and using second slope as the second time window factor.
8. the switching device of wireless access point as claimed in claims 6 or 7, which is characterized in that the preset time window letter
Number is expressed as follows:
Wherein, y is the signal strength indication in the preset time, and Δ t is the preset time, and x is current time, and k is slope,
B is the intercept of the time window function on the y axis.
9. a kind of train, at least one vehicle-mounted wireless access point AP is provided on the train, which is characterized in that the vehicle-mounted nothing
Line access point AP is used to execute the switching method of wireless access point according to any one of claims 1 to 4.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710537047.5A CN107889181B (en) | 2017-07-04 | 2017-07-04 | Switching method, device and the train of wireless access point |
| PCT/CN2018/083537 WO2019007134A1 (en) | 2017-07-04 | 2018-04-18 | Method and apparatus for switching wireless access point, and train |
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| CN201710537047.5A CN107889181B (en) | 2017-07-04 | 2017-07-04 | Switching method, device and the train of wireless access point |
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| CN107889181B true CN107889181B (en) | 2019-04-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107889181B (en) * | 2017-07-04 | 2019-04-19 | 比亚迪股份有限公司 | Switching method, device and the train of wireless access point |
| CN109257732B (en) * | 2018-09-30 | 2022-04-19 | Oppo广东移动通信有限公司 | Equipment control method and device and electronic equipment |
| CN110809251B (en) * | 2019-10-10 | 2022-08-19 | 锐捷网络股份有限公司 | Switching method and device of wireless access point |
| CN113650650A (en) * | 2020-05-12 | 2021-11-16 | 株洲中车时代电气股份有限公司 | Freight air rail vehicle remote control system |
| CN112492585B (en) * | 2020-11-13 | 2022-11-25 | 杭州迪普科技股份有限公司 | Method for connecting wireless terminal with wireless local area network and network system |
| CN114697921B (en) * | 2020-12-30 | 2023-07-04 | 美的集团股份有限公司 | Method and device for connecting devices, electronic device and storage medium |
| CN114501516B (en) * | 2022-02-14 | 2024-03-12 | 成都市以太节点科技有限公司 | Indoor test method and system for vehicle-ground wireless communication switching |
| CN115396969A (en) * | 2022-08-30 | 2022-11-25 | 深圳市创凌智联科技有限公司 | Method and device for realizing seamless switching between devices through WIFI signal strength |
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| CN107889181A (en) | 2018-04-06 |
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