CN103327506B - WLAN overlapping control method, emission parameter optimization method, device and system - Google Patents
WLAN overlapping control method, emission parameter optimization method, device and system Download PDFInfo
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Abstract
The embodiment of the present invention provides WLAN overlapping control method, emission parameter optimization method, device and system, the probability received with the terminal reduced outside network information coated region, strengthens network security.Described method includes: obtain optimum emission parameter；According to the type of current frame to be sent, using described optimum emission parameter or calculate the emission parameter described current frame to be sent of transmission of gained according to multiple antenna scheduling algorithm, the type of described current frame to be sent includes managing frame and Frame.The WLAN overlapping control method that the embodiment of the present invention provides, both ensure that the quality of terminal received signals in overlay area, in turn ensure that the network key information that management frame carries only can receive in specific region, enhance the safety of network, meanwhile, treat Frame and the transmission of management frame with a certain discrimination, achieve trading off between Coverage Control and multiple antennas processing gain to a certain extent, thus obtain enough multiple antenna scheduling flexibility ratios.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to WLAN overlapping control method, emission parameter optimization method, device
And system.
Background technology
Along with developing rapidly of broadband wireless access demand, WLAN (Wireless Local Area
Network, WLAN) technology and industry increasingly mature and universal.The WLAN of main flow can provide at a high speed at lower cost
Data transmission performance.For the consideration of the factors such as compatible, cost and transmission bandwidth, WLAN generally uses open frequency
Section and simple wireless access mechanism.When wireless local area network technology is used for the network of relative closure, the coverage pair of signal
Performance of wireless local area networks has a major impact.When there is multiple adjacent WLAN, the coverage of control signal can be kept away
Exempt to interfere with each other, because the technology (such as, 802.11) that most of WLAN uses is quite sensitive to interference.Control signal
Coverage be not only the mode avoided interference, and one of be means of protection network security, such as, if institute's networking
Network is the network of the relative closures such as a kind of similar WLAN, then the coverage of control signal mainly avoids signal to reveal
Beyond expectation overlay area (such as, Administrative Area), expect that the terminal outside overlay area receives the network information to reduce
Probability, thus the attempting or finding and the probability of attacking network of accessing terminal to network outside reducing expectation overlay area.
On the other hand, the wireless local area network technology (such as, 802.11) of current main flow have employed random access collision and keeps out of the way
Access mechanism, all terminals can seize channel time slot coequally, and a result of this access mechanism is: when participating in robbing
The terminal number accounting for channel increases to a certain degree, and throughput of system is by degradation.This feature of above-mentioned access mechanism is very
Easily it is utilized and network is carried out malicious attack.Although there being the multiple cipher mode exclusively for WLAN design at present, but
It is that these cipher modes can only solve packet by interception problem.The terminal once intending to carry out malicious attack is found that a nothing
Line local net network, can seize channel simply by malice rather than just can reach attacking network by interception packet
Purpose.
Knowable to being analyzed above, when setting up WLAN, it is necessary to consider the Coverage Control of wireless local.Wireless local
The Coverage Control of net is the planning problem of a relative quiescent, i.e. by controlling each access point (Access Point, AP)
Launch power and launch direction, providing satisfactory signal intensity to cover for specific region.But, use letter with cellular network
Signaling channel is machine-processed different with data channel, and WLAN transmits data the most in the form of frames, and management frame and Frame are all
Take identical channel, send in a time multiplexed manner.From the point of view of frequency domain angle, channel refers to certain the frequency model on frequency domain
Enclose, owing to Coverage Control is by controlling the transmitting power of access point transmitter and launching direction acquisition, and launch power and send out
Penetrate direction to arrange, therefore for specific frequency, it is however generally that, the Coverage Control of WLAN is for specific letter
Road is carried out.
But, in terms of the Coverage Control of WLAN, prior art there is no preferable scheme, access point remain with
Full power, omnirange send management frame, and this technology without any Coverage Control measure is not appropriate for such as WLAN etc.
Need the occasion that control signal covers.
Summary of the invention
The embodiment of the present invention provides WLAN overlapping control method, emission parameter optimization method, device and system, to reduce net
The probability that terminal outside network information coated region receives, strengthens network security.
The embodiment of the present invention provides a kind of WLAN overlapping control method, and described method includes: obtain optimum emission parameter, institute
State transmitting power and antenna parameter, the described expectation spreadability of access point when optimum emission parameter includes obtaining expectation covering performance
In including being expected to overlay area, zones of different has different signal intensitys；According to the type of current frame to be sent, use
Described optimum emission parameter or the emission parameter according to multiple antenna scheduling algorithm calculating gained send described current frame to be sent,
The type of described current frame to be sent includes managing frame and Frame.
Alternatively, the described optimum emission parameter that obtains includes: receives access controller and calculates according to optimized algorithm and configure
Transmitting power and antenna parameter to described access point.
Alternatively, the described optimum emission parameter that obtains includes: receive access controller spreadability in described overlay area
Recalculate and be configured to transmitting power and the antenna parameter of described access point after changing according to optimized algorithm.
Alternatively, the type of the current frame to be sent of described basis, use described optimum emission parameter or according to multiple antennas
Dispatching algorithm calculates the emission parameter of gained and sends described current frame to be sent and include: judge that whether described current frame to be sent is
Described management frame；If described current frame to be sent is described management frame, then described optimum emission parameter is used to send described management
Frame.
Alternatively, the type of the current frame to be sent of described basis, use described optimum emission parameter or according to multiple antennas
Dispatching algorithm calculates the emission parameter of gained and sends described current frame to be sent and include: judge that whether described current frame to be sent is
Described Frame；If described current frame to be sent is described Frame, then use described optimum emission parameter or according to many days
Line dispatching algorithm calculates the emission parameter of gained and sends described Frame.
The embodiment of the present invention provides a kind of emission parameter optimization method, and described method includes: some in obtaining overlay area
Measuring the performance parameter of point, the performance parameter of described measurement point includes the described intensity of signal that point receives or described measured
Measure the propagation attenuation parameter between point and access point；If according to the performance parameter of dry measure point in overlay area, calculate optimum
Emission parameter, described optimum emission parameter includes transmitting power and antenna parameter, the institute obtaining access point when expecting covering performance
State zones of different in expectation covering performance includes being expected to overlay area and there is different signal intensitys.
Alternatively, if described dry measure point is the position disposing M sensor in described overlay area, described M is more than 1
Integer；If in described acquisition overlay area, the performance parameter of dry measure point includes: receive the described of described M sensor feedback
M the received signal strength value measuring point；If described according to the performance parameter of dry measure point in overlay area, calculate optimum and launch
Parameter includes: according to described M the received signal strength value measuring point, calculates according to optimized algorithm and makes terminal in overlay area
Received signal strength and the transmitting power of access point and antenna parameter when receiving signal expectation strength error minimum.
Alternatively, if the performance parameter of dry measure point includes in described acquisition overlay area: measure access point and M measurement
Propagation attenuation parameter between point, described M is the integer more than 1；If it is described according to the performance ginseng of dry measure point in overlay area
Number, calculates optimum emission parameter and includes: measure the propagation attenuation parameter between point according to described access point and M, according to optimization
Algorithm calculates and makes terminal received signals intensity in overlay area and the sending out of access point when receiving signal expectation strength error minimum
Penetrate power and antenna parameter.
The embodiment of the present invention provides a kind of WLAN Coverage Control device, and described device includes: acquisition module, for obtaining
Excellent emission parameter, described optimum emission parameter includes transmitting power and the antenna parameter obtaining access point when expecting covering performance,
In described expectation covering performance includes being expected to overlay area, zones of different has different signal intensitys；Sending module, is used for
According to the type of current frame to be sent, use described optimum emission parameter or calculate sending out of gained according to multiple antenna scheduling algorithm
Penetrating parameter and send described current frame to be sent, the type of described current frame to be sent includes managing frame and Frame.
Alternatively, described acquisition module includes: first receive unit, by receive access controller according to optimized algorithm based on
Calculate and be configured to transmitting power and the antenna parameter of described access point.
Alternatively, described acquisition module includes: second receives unit, is used for receiving access controller in described overlay area
Interior covering performance recalculates and is configured to transmitting power and the antenna ginseng of described access point according to optimized algorithm after changing
Number.
Alternatively, described sending module includes: the first judging unit, is used for judging whether described current frame to be sent is institute
State management frame；First transmitting element, if judging that current frame to be sent is described management frame for described first judging unit, then makes
Described management frame is sent with described optimum emission parameter.
Alternatively, described sending module includes: the second judging unit, is used for judging whether described current frame to be sent is institute
State Frame；Second transmitting element, if judging that current frame to be sent is described Frame for described second judging unit, then makes
Emission parameter with described optimum emission parameter or according to multiple antenna scheduling algorithm calculating gained sends described Frame.
The embodiment of the present invention provides a kind of emission parameter to optimize device, and described device includes: acquisition module, covers for acquisition
If the performance parameter of dry measure point in cover region territory, the performance parameter of described measurement point includes described measuring the signal that point receives
Propagation attenuation parameter between intensity or described measurement point and access point；Computing module, for according to some in overlay area
Measuring the performance parameter of point, calculate optimum emission parameter, described optimum emission parameter includes accessing when obtaining expectation covering performance
The transmitting power of point and antenna parameter, in described expectation covering performance includes being expected to overlay area, zones of different has different
Signal intensity.
The embodiment of the present invention provides a kind of WLAN Coverage Control system, and described system includes access controller and access point；
Described access controller, if the performance parameter of dry measure point in obtaining overlay area, if according to dry measure in overlay area
The performance parameter of point, calculates optimum emission parameter, and the performance parameter of described measurement point includes the signal that described measurement point receives
Intensity or described measurement point and access point between propagation attenuation parameter, described optimum emission parameter includes that obtaining expectation covers
The transmitting power of access point and antenna parameter during lid performance, described expectation covering performance includes being expected to Nei Bu same district, overlay area
Territory has different signal intensitys；Described access point, calculates the optimum emission parameter of gained for obtaining described access controller,
According to the type of current frame to be sent, use described optimum emission parameter or calculate sending out of gained according to multiple antenna scheduling algorithm
Penetrating parameter and send described current frame to be sent, the type of described current frame to be sent includes managing frame and Frame.
Knowable to the invention described above embodiment, optimum emission parameter be so that in overlay area terminal received signals intensity with
The transmitting power of access point and antenna parameter when receiving signal expectation strength error minimum, access point uses optimum emission parameter to send out
Send management frame, use optimum emission parameter or use the emission parameter transmission data calculating gained according to multiple antenna scheduling algorithm
Frame.Therefore, with prior art compared with send management frame or Frame do not carries out Coverage Control, the embodiment of the present invention provides
WLAN overlapping control method, both ensure that the quality of terminal received signals in overlay area, in turn ensure that the net that management frame carries
Network key message only can receive in specific region, enhances the safety of network, meanwhile, treats Frame with a certain discrimination
With the transmission of management frame, achieve trading off between Coverage Control and multiple antennas processing gain to a certain extent, thus obtain
Enough multiple antenna scheduling flexibility ratio.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, in prior art or embodiment being described below
The required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only some realities of the present invention
Execute example, for those skilled in the art, it is also possible to as these accompanying drawings obtain other accompanying drawing.
Fig. 1 is the WLAN overlapping control method schematic flow sheet that the embodiment of the present invention provides；
Fig. 2 is the emission parameter optimization method schematic flow sheet that the embodiment of the present invention provides；
Fig. 3 is the WLAN Coverage Control apparatus structure schematic diagram that the embodiment of the present invention provides；
Fig. 4 is the WLAN Coverage Control apparatus structure schematic diagram that another embodiment of the present invention provides；
Fig. 5 is the WLAN Coverage Control apparatus structure schematic diagram that another embodiment of the present invention provides；
Fig. 6 a is the WLAN Coverage Control apparatus structure schematic diagram that another embodiment of the present invention provides；
Fig. 6 b is the WLAN Coverage Control apparatus structure schematic diagram that another embodiment of the present invention provides；
Fig. 6 c is the WLAN Coverage Control apparatus structure schematic diagram that another embodiment of the present invention provides；
Fig. 7 a is the WLAN Coverage Control apparatus structure schematic diagram that another embodiment of the present invention provides；
Fig. 7 b is the WLAN Coverage Control apparatus structure schematic diagram that another embodiment of the present invention provides；
Fig. 7 c is the WLAN Coverage Control apparatus structure schematic diagram that another embodiment of the present invention provides；
Fig. 8 is that the emission parameter that the embodiment of the present invention provides optimizes apparatus structure schematic diagram；
Fig. 9 is the WLAN Coverage Control system structure schematic diagram that the embodiment of the present invention provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, the every other embodiment that those skilled in the art are obtained, broadly fall into the scope of protection of the invention.
Refer to accompanying drawing 1, be the WLAN overlapping control method schematic flow sheet of embodiment of the present invention offer, its executive agent
Can be the access point (Access Point, AP) in WLAN, mainly include step:
S101, obtains optimum emission parameter, access point when described optimum emission parameter includes obtaining expectation covering performance
Launching power and antenna parameter, described expectation covering performance is included in zones of different in overlay area, and to have different signals strong
Degree.
In embodiments of the present invention, when optimum emission parameter includes obtaining expectation covering performance access point transmitting power and
Antenna parameter etc., and expect covering performance be included in overlay area in zones of different there is different signal intensitys, access point is pressed
Launching power and antenna parameter in overlay area during zones of different transmission signal according to these, in these, zones of different receives
Actual signal intensity is minimum with the error of received signal strength expected value.Such as, certain during overlay area includes certain office building
One layer of Administrative Area, but this layer of Administrative Area is spaced apart different rooms, and what each room may be moved into is different enterprise or same
The different departments of one enterprise, so, the signal intensity in these different rooms has different requirement, such as, in certain room
Require to receive signal strong, but it is more weak to require to receive signal outside this room.
In order to obtain these optimum emission parameters, the first embodiment is: the access controller being connected with access point
(Access Controller, AC) first according to the received signal strength of the sensor feedback in access point overlay area according to
Certain optimized algorithm calculates optimum emission parameter, is then configured to access point, access point receive access controller according to
Optimized algorithm calculates and is configured to transmitting power and the antenna parameter of this access point.The second embodiment is: access controller
In measuring access point and this access point overlay area, several measure the propagation attenuation parameter between point, according to these propagation attenuations
Parameter, calculates optimum emission parameter according to optimized algorithm, is then configured to access point, and access point receives access controller
Calculate and be configured to transmitting power and the antenna parameter of this access point according to optimized algorithm.
It should be noted that in access point obtains the first embodiment of optimum emission parameter, once overlay area
The change of endogenous cause of ill environment, such as, the finishing layout change of overlay area and the accidental movement of access point position etc., cause covering
Performance changes, and such as, actual covering performance exceedes certain threshold value with the covering performance preset, then access controller is pressed
Recalculating optimum emission parameter according to optimized algorithm, be then configured to access point, access point receives access controller and presses
Calculate and be configured to transmitting power and the antenna parameter of this access point according to optimized algorithm.
S102, according to the type of current frame to be sent, uses described optimum emission parameter or calculates according to multiple antenna scheduling
Method calculates the emission parameter of gained and sends described current frame to be sent, and the type of described current frame to be sent includes managing frame sum
According to frame.
In embodiments of the present invention, the type of frame to be sent includes managing frame and Frame, and wherein, management frame can be nothing
Beacon, Probe Request & Response, Authentication, De-of line local area network standard 802.11 definition
authentication、Association Request & Response、Re-association Request &
Response, Dis-association and Announcement Traffic Indication Message etc. 11 kinds manage frame
In any one.
Access point can first determine whether the type of current frame to be sent, such as, judge whether current frame to be sent is management
Frame, if judging, current frame to be sent as management frame, then uses the optimum emission parameter of acquisition to send described management frame.Access point is also
May determine that whether current frame to be sent is Frame, if judging, described current frame to be sent is Frame, then use acquisition
Optimum emission parameter sends described Frame, or, the emission parameter calculating gained according to multiple antenna scheduling algorithm sends institute
State Frame.
It should be noted that multi-antenna technology is widely used in current radio communication, when carrying out business data transmission,
Access point, according to the channel status of current communications link, is dynamically selected antenna and power, to obtain more preferable laser propagation effect.Nothing
The line LAN overwhelming majority is operated in unauthorized open frequency range, and uses simple time division multiplexed scheme, in order to obtain more
Big link throughput, the most not to launch power limit, but by multiple antenna scheduling algorithm be dynamically determined transmitting power and
Antenna parameter.Owing to the Coverage Control of WLAN is a static process, i.e. to access point in a long time scale
Transmitting power and antenna parameter be defined, and multiple antenna scheduling is a dynamic process, i.e. according to different delivery times
Transmitting power and the antenna parameter of access point are adjusted by different channels state, in other words, and Coverage Control and multiple antenna scheduling
Exist a certain degree of compromise.Therefore, in embodiments of the present invention, access point selects to make according to the type of current frame to be sent
The emission parameter calculating gained according further to multiple antenna scheduling algorithm with optimum emission parameter sends, this benefit treated with a certain discrimination
It is: for the management frame sent from access point, carried out Coverage Control so that the network key information that management frame carries only exists
Can receive in specific region, enhance the safety of network；For the Frame sent from access point, both can use and obtain
The optimized parameter that takes sends to carry out Coverage Control, it is possible to use transmitting power that multiple antenna scheduling algorithm is dynamically determined and sky
Line parameter sends and does not carry out Coverage Control, and this achieves between Coverage Control and multiple antennas processing gain to a certain extent
Compromise, thus obtain enough multiple antenna scheduling flexibility ratios.
Knowable to the WLAN overlapping control method that the invention described above embodiment provides, optimum emission parameter is so that the area of coverage
In territory, terminal received signals intensity and the transmitting power of access point and antenna parameter when receiving signal expectation strength error minimum, connect
Access point uses optimum emission parameter to send management frame, uses optimum emission parameter or uses according to the calculating of multiple antenna scheduling algorithm
The emission parameter of gained sends Frame.Therefore, Coverage Control phase is not carried out with prior art at transmission management frame or Frame
Ratio, the WLAN overlapping control method that the embodiment of the present invention provides, both ensure that the quality of terminal received signals in overlay area, again
Ensure that the network key information that management frame carries only can receive in specific region, enhance the safety of network, with
This treats Frame and the transmission of management frame with a certain discrimination simultaneously, achieves Coverage Control to a certain extent and increases with multiple antennas process
Trading off between benefit, thus obtain enough multiple antenna scheduling flexibility ratios.
Refer to accompanying drawing 2, be the emission parameter optimization method schematic flow sheet of embodiment of the present invention offer, its executive agent
It can be the access controller (Access Controller, AC) in WLAN.AC is connected with one or more AP, real
The now management to AP.Such as, calculate optimum emission parameter for each AP and be configured to each AP so that each AP launches ginseng according to optimum
Number sends management frame or Frame etc..The emission parameter optimization method of accompanying drawing 2 example mainly includes step:
S201, if the performance parameter of dry measure point in obtaining overlay area, the performance parameter of described measurement point includes described
Measure the propagation attenuation parameter between intensity or described measurement point and the access point of the signal that point receives.
As first embodiment of the invention, in measuring the access point overlay area that point can be WLAN, deploy M
The position of individual sensor, wherein, M is greater than the integer of 1.The initial stage is set up, according to the region of required covering at WLAN
The number of the demand of size, environment, coverage strength and capacity required access point according to a preliminary estimate and position.Then, believe according to difference
Number coverage strength demand divides different regions, typical division methods be region is divided into inside WLAN, edge
With outside three regions.The sensor of some (such as, M) is disposed, the position choosing between sensor in zones of different
Select the position that communication environments is representative in certain region, and the communication environments dependency of different sensors present position should
The lowest.Access controller is connected with access point, receives the received signal strength of M measurement point of M sensor feedback
Value.
As second embodiment of the invention, it is also possible to set up the initial stage at WLAN, according to the region of required covering
The number of the demand of size, environment, coverage strength and capacity required access point according to a preliminary estimate and position.Then according to unlike signal
Coverage strength demand divides different regions, determines that M is typically measured a little, measure point and ownership in different regions
Propagation attenuation parameter between access point.Usually, the selection principle measuring point is chosen in same communication environments as far as possible
Heart point.
S202, if according to the performance parameter of dry measure point in overlay area, calculates optimum emission parameter, described optimum transmitting
Parameter includes transmitting power and the antenna parameter obtaining access point when expecting covering performance, and described expectation covering performance includes expectation
In overlay area, zones of different has different signal intensitys.
If corresponding to the performance parameter first embodiment of dry measure point in acquisition overlay area in step S201, as this
If bright according to the performance parameter of dry measure point in overlay area, calculate an embodiment of optimum emission parameter, access control point
Can calculate according to optimized algorithm make certain measurement in overlay area according to described M the received signal strength value measuring point
The transmitting power of access point and antenna parameter when the actual received signal strength of point and reception signal expectation strength error minimum.Specifically
Ground, it is assumed that having N number of access point in WLAN and deploy M sensor, access controller is connected with all of access point,
And transmitting power and the antenna parameter of access point can be controlled；Access point configuration multiple antennas, it is launched direction controlling and can pass through
Multiple scannings being differently directed the selection of wave beam, the synthesis wave beam of smart antenna or simple beam realize.Sensor measurement connects
Broadcast frame (one of the management frame) signal intensity that access point sends, and feed back to access controller, sensor is placed on certain bits
Put, the received signal strength of the measured value reflection region of the broadcast frame signal intensity of its feedback.In access controller side,
When calculating optimum emission parameter, can be that each sensor location sets a received signal strength expected value
{targeti, i=1,2 ..., M}, the terminal received signals intensity expectation of this received signal strength expected value namely this position
Value.The cost function of defined formula (1):
Wherein, wiFor the weighted value of i-th sensor, rcviReceived signal strength for i-th sensor current feedback
Measured value.By adjusting the weighted value of certain sensor, the importance of the covering performance of this sensor position can be adjusted,
Because Coverage Control is a complicated process, the actual coverage strength of zones of different there may be compromise, is weighted by adjustment
Value can better ensure that the covering performance of some important area.
Use cost letter defined in the measured value computing formula (1) of the received signal strength that current all the sensors feeds back
Numerical value, it can be estimated that when access point sends signal with current transmitting power and transmission parameter, terminal received signals in overlay area
Error between intensity and received signal strength expected value.Access controller is according to certain optimized algorithm, calculation cost function
The minima of cost, calculates shown in public equation below (2):
Wherein, P is the transmitting power of access point, and param is the antenna parameter of access point, and rcv is that received signal strength is vowed
Amount, comprises the measured value of the received signal strength of all the sensors feedback.The optimized algorithm root that formula (1) and formula (2) represent
Determining that Coverage Control has restrained according to the value of this cost function, or continue next round iterative process, its target is
Littleization cost function cost, in now corresponding transmitting power P and antenna parameter param are just so that overlay area, certain is measured
The actual received signal strength of point and the transmitting power of access point and antenna parameter during received signal strength expected value error minimum.
There is linear relationship with the received signal strength of certain position in switch-in point transmitting power, thus be accordingly used in linear relationship
Optimized algorithm can serve as receiving the optimized algorithm on controller, all of linear programming method (such as, Nelder-Mead
Algorithm) can serve as optimized algorithm, some heuristic methods (such as, genetic algorithm) can also be as optimized algorithm.Essence
On, optimized algorithm defines an iterative process, calculates current iteration knot according to previous round iteration result and cost function thereof
Really, flow process defined in different optimized algorithms is not quite similar, but inherently belongs to a kind of search procedure.At this programme
In, an iteration of optimized algorithm produces the new transmitting power of access point one and antenna parameter, and access point uses this new sending out
Penetrating power and antenna parameter and send broadcast frame, the signal intensity of its present position of sensor measurement also feeds back to access controller.
Error between optimized algorithm assessment measured value and expected value that access controller represents according to formula (1) and formula (2) (namely
Terminal received signals intensity and received signal strength expected value error in overlay area), produce new transmitting power and antenna ginseng
Number, such loop iteration, until specific optimal conditions meets.So-called specific optimal conditions, by the strategy of the process of optimization
Determining, conventional has: reach to preset maximum iteration time, cost function value convergence steadily or reaches the default control time, etc..
In the above-described embodiments, if covering performance changes in overlay area, then access controller is according to optimized algorithm
Recalculate optimum emission parameter, and be configured to access point.Specifically, optimized algorithm is used when access point according to access controller
After the emission parameter calculated sends signal, network enters the operation phase, provides business datum to pass for the terminal in overlay area
Send.But, in the change of environment may cause access point overlay area, covering performance changes, such as, and the dress of overlay area
Repair the accidental movement of layout change and/or access point position, etc..In embodiments of the present invention, after network enters the operation phase
System enters and covers the supervision stage, i.e. access controller is assessed currently by the measured value receiving signal of sensor feedback
Covering performance, when actual covering performance, relative to default covering performance deviation, (actual received signal strength is strong with reception signal
The error of degree expected value) exceed pre-determined threshold εcTime, start Coverage Control, recalculate transmitting power and the antenna ginseng of access point
Number.Cover the adjustment to switch-in point transmitting power and antenna parameter of the supervision stage with the coverage optimization and control stage to access point transmitting
The difference of the calculating of power and antenna parameter is, the adjustment covering the supervision stage is to be calculated in the coverage optimization and control stage
Launch the fine setting made on power and antenna parameter rather than as the extensive search in coverage optimization and control stage.It is worth note
Meaning, is covering the supervision stage, and the feedback cycle of measuring of sensor is far longer than the survey of coverage optimization and control stage sensor
Amount feedback cycle because cover the supervision stage covering performance change less, and cross frequently measure feedback data will waste nothing
The transmission bandwidth of line LAN.
In order to determine thresholding εc, need to limit, really according to the covering performance patient error of institute or minimum vertex-covering performance
Determine regional and can tolerate the error of covering performance, then can calculate acquisition thresholding ε according to formula (3)c。
Wherein, it is the group number that sensor is divided into by N, such as, the sensor of same area is classified as same group, δiIt is
The received signal strength deviation that i group sensor present position allows,For corresponding weighted value；targetiFor corresponding average
Target strength, as M=N, each sensor is one group.
If corresponding to performance parameter second embodiment of dry measure point in acquisition overlay area in step S201, as this
If bright according to the performance parameter of dry measure point in overlay area, calculate another embodiment of optimum emission parameter, access control point
The propagation attenuation parameter between point can be measured according to described access point and M, calculate according to optimized algorithm and make overlay area
In certain measures the actual received signal strength of point and the transmitting power of access point during reception signal expectation strength error minimum and sky
Line parameter.Specifically, it is assumed that measure M the propagation attenuation parameter { pl measuring point in certain access point overlay areai, i=1,
2 ..., M}, is { target at this M the expectation coverage strength measured on pointi, i=1,2 ..., M}, then the transmitting merit of access point
Rate and antenna parameter arrange the actual received signal strength on all measurement points under it should be made to cover and received signal strength phase
The global error of prestige value is minimum, and concrete computational methods depend on the antenna type with access point.To synthesize the smart antenna of wave beam
As a example by array, if N number of omnidirectional array element shown by antenna array, then in overlay area, Coverage Control problem is converted into and determines N × 1 dimension
Smart antenna weight vector, makes error minimize defined in formula (4), i.e. optimized design problem described by formula (5).
Wherein, vector wHFor the weight coefficient of aerial array, vector viFor the direction vector of access point to ith measurement point,
P is the peak power of transmitter.Weight vectors w obtained by solution formula (5)HI.e. can determine that this access point transmitting power and
Antenna parameter.
The adjustment parameter of dissimilar antenna is different, such as, the adjustable parameter of multi-beam switched system be beam selection and
Beam power.But the adjustment target of dissimilar antenna is similar with the adjustment target of above-mentioned smart antenna, is all and minimizes reality
Global error between border received signal strength and received signal strength expected value.
Refer to accompanying drawing 3, be the WLAN Coverage Control apparatus structure schematic diagram of embodiment of the present invention offer.For the ease of saying
Bright, illustrate only the part relevant to the embodiment of the present invention.The WLAN Coverage Control device of accompanying drawing 3 example can be wireless office
Access point (Access Point, AP) in the net of territory, it includes acquisition module 301 and sending module 302, wherein:
Acquisition module 301, is used for obtaining optimum emission parameter, and described optimum emission parameter includes obtaining expectation covering performance
Time the transmitting power of access point and antenna parameter, in described expectation covering performance includes being expected to overlay area, zones of different has
Different signal intensitys；
Sending module 302, for the type according to current frame to be sent, uses described optimum emission parameter or according to many
Antenna scheduling algorithm calculates the emission parameter of gained and sends described current frame to be sent, and the type of described current frame to be sent includes
Management frame and Frame.
It should be noted that in the embodiment of above WLAN Coverage Control device, the division of each functional module is only to lift
Example illustrates, can as required in actual application, the configuration requirement of such as corresponding hardware or the convenient consideration of the realization of software,
And above-mentioned functions distribution is completed by different functional modules, the internal structure of described gateway will be divided into different function moulds
Block, to complete all or part of function described above.And, in actual application, the corresponding function mould in the present embodiment
Block can be to be realized by corresponding hardware, it is also possible to is performed corresponding software by corresponding hardware and completes, such as, and aforesaid acquisition
Module, can be to have to perform the aforementioned hardware obtaining optimum emission parameter, such as getter, it is also possible to be to be able to carry out accordingly
Computer program thus complete general processor or other hardware devices of aforementioned function；The most aforesaid sending module, can
To be the type having and performing the current frame to be sent of aforementioned basis, use described optimum emission parameter or according to multiple antenna scheduling
Algorithm calculates the hardware of the emission parameter described current frame function to be sent of transmission of gained, such as transmitter, it is also possible to be can
Perform corresponding computer program thus complete the general processor of aforementioned function or other hardware devices (this specification provides
Each embodiment all can apply foregoing description principle).
In the WLAN Coverage Control device of accompanying drawing 3 example, acquisition module 301 can include the first reception unit 401, as
The WLAN Coverage Control device that another embodiment of the present invention shown in accompanying drawing 4 provides.First receives unit 401, is used for receiving access
Controller calculates according to optimized algorithm and is configured to transmitting power and the antenna parameter of described access point.
In the WLAN Coverage Control device of accompanying drawing 3 example, acquisition module 301 can also include the second reception unit 501,
The WLAN Coverage Control device that another embodiment of the present invention provides as shown in Figure 5.Second receives unit 501, connects for reception
Connect described in recalculating according to optimized algorithm after entering controller covering performance changing in described overlay area and being configured to
The transmitting power of access point and antenna parameter.
The finishing layout change of overlay area and the accidental movement of access point position etc., these overlay area endogenous cause of ill environment
Change cause covering performance to change, such as, actual covering performance exceedes certain threshold value with the covering performance preset,
Then access controller recalculates optimum emission parameter according to optimized algorithm, is then configured to access point, and second receives
Unit 501 receives access controller and recalculates and be configured to transmitting power and the antenna ginseng of this access point according to optimized algorithm
Number.
In the WLAN Coverage Control device of accompanying drawing 3 to accompanying drawing 5 any example, sending module 302 can include that first sentences
Disconnected unit 601 and the first transmitting element 602, as shown in accompanying drawing 6a, accompanying drawing 6b and accompanying drawing 6c, another embodiment of the present invention provides
WLAN Coverage Control device, wherein:
First judging unit 601, is used for judging whether described current frame to be sent is described management frame；
For described first judging unit 601, first transmitting element 602, if judging that current frame to be sent is described management
Frame, then use described optimum emission parameter to send described management frame.
In the WLAN Coverage Control device of accompanying drawing 3 example, sending module 302 can also include the second judging unit 701
With the second transmitting element 702, the WLAN that another embodiment of the present invention as shown in accompanying drawing 7a, accompanying drawing 7b and accompanying drawing 7c provides covers control
Device processed, wherein:
Second judging unit 701, is used for judging whether described current frame to be sent is described Frame；
For described second judging unit 701, second transmitting element 702, if judging that current frame to be sent is described data
Frame, then use described optimum emission parameter or calculate the emission parameter described data of transmission of gained according to multiple antenna scheduling algorithm
Frame.
Refer to accompanying drawing 8, be that the emission parameter that the embodiment of the present invention provides optimizes apparatus structure schematic diagram.For the ease of saying
Bright, illustrate only the part relevant to the embodiment of the present invention.It can be wireless office that the emission parameter of accompanying drawing 8 example optimizes device
Access controller (Access Controller, AC) in the net of territory, it includes acquisition module 801 and computing module 802, wherein:
Acquisition module 801, if the performance parameter of dry measure point in obtaining overlay area, the performance ginseng of described measurement point
Number includes the propagation attenuation parameter between described intensity or described measurement point and the access point measuring the signal that point receives；
Computing module 802, if for according to the performance parameter of dry measure point in overlay area, calculating optimum emission parameter,
Described optimum emission parameter includes transmitting power and the antenna parameter obtaining access point when expecting covering performance, and described expectation covers
In performance includes being expected to overlay area, zones of different has different signal intensitys.
Refer to accompanying drawing 9, be the WLAN Coverage Control system structure schematic diagram of embodiment of the present invention offer.For the ease of saying
Bright, illustrate only the part relevant to the embodiment of the present invention.The WLAN Coverage Control system of accompanying drawing 9 example includes that accompanying drawing 8 shows
The access controller 901 of example and the access point 902 of accompanying drawing 3 to accompanying drawing 7c any example, wherein:
Access controller 901, if the performance parameter of dry measure point in obtaining overlay area, if according in overlay area
The performance parameter of dry measure point, calculates optimum emission parameter, and the performance parameter of described measurement point includes that described point of measuring receives
Signal intensity or described measurement point and access point between propagation attenuation parameter, described optimum emission parameter includes obtaining
Expecting transmitting power and the antenna parameter of access point during covering performance, described expectation covering performance includes being expected in overlay area
Zones of different has different signal intensitys；
Access point 902, calculates the optimum emission parameter of gained, according to currently treating for obtaining described access controller 901
Send the type of frame, use described optimum emission parameter or calculate the emission parameter transmission of gained according to multiple antenna scheduling algorithm
Described current frame to be sent, the type of described current frame to be sent includes managing frame and Frame.
It should be noted that contents such as mutual, the execution processes of information between each module/unit of said apparatus, due to
The inventive method embodiment is based on same design, and its technique effect brought is identical with the inventive method embodiment, particular content
Can be found in the narration in the inventive method embodiment, here is omitted.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can
Complete instructing relevant hardware by program, such as following various methods one or more or all:
WLAN overlapping control method, described method includes: obtain optimum emission parameter；Class according to current frame to be sent
Type, uses described optimum emission parameter or calculates the emission parameter of gained according to multiple antenna scheduling algorithm and send and described currently treat
Sending frame, the type of described current frame to be sent includes managing frame and Frame, and described optimum emission parameter includes obtaining expectation
The transmitting power of access point and antenna parameter during covering performance, described expectation covering performance is different in including being expected to overlay area
Region has different signal intensitys.
A kind of emission parameter optimization method, described method includes: if the performance parameter of dry measure point in obtaining overlay area,
The described performance parameter measuring point include described measure the intensity of signal that point receives or described measurement point and access point it
Between propagation attenuation parameter；If according to the performance parameter of dry measure point in overlay area, calculate optimum emission parameter, described optimum
Emission parameter includes transmitting power and the antenna parameter obtaining access point when expecting covering performance, and described expectation covering performance includes
In being expected to overlay area, zones of different has different signal intensitys.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is can
Completing instructing relevant hardware by program, this program can be stored in a computer-readable recording medium, storage
Medium may include that read only memory (ROM, Read Only Memory), random access memory (RAM, Random
Access Memory), disk or CD etc..
WLAN overlapping control method, emission parameter optimization method, device and the system above embodiment of the present invention provided
Being described in detail, principle and the embodiment of the present invention are set forth by specific case used herein, above reality
The explanation executing example is only intended to help to understand method and the core concept thereof of the present invention；General technology simultaneously for this area
Personnel, according to the thought of the present invention, the most all will change, in sum, and this theory
Bright book content should not be construed as limitation of the present invention.
Claims (7)
1. a WLAN overlapping control method, it is characterised in that described method includes:
Obtaining optimum emission parameter, described optimum emission parameter includes obtaining expectation covering performance and measuring some reality receiving signal
When intensity and reception signal expectation strength error minimum, the transmitting power of access point and antenna parameter, described expectation covering performance
Including zones of different in being expected to overlay area, there is different signal intensitys；
According to the type of current frame to be sent, use described optimum emission parameter or calculate gained according to multiple antenna scheduling algorithm
Emission parameter send described current frame to be sent, the type of described current frame to be sent includes managing frame and Frame；
The type of the current frame to be sent of described basis, uses described optimum emission parameter or calculates according to multiple antenna scheduling algorithm
The emission parameter of gained sends described current frame to be sent and includes:
Judge whether described current frame to be sent is described management frame；
If described current frame to be sent is described management frame, then described optimum emission parameter is used to send described management frame；
The type of the current frame to be sent of described basis, uses described optimum emission parameter or calculates according to multiple antenna scheduling algorithm
The emission parameter of gained sends described current frame to be sent and includes:
Judge whether described current frame to be sent is described Frame；
If described current frame to be sent is described Frame, then uses described optimum emission parameter or calculate according to multiple antenna scheduling
Method calculates the emission parameter of gained and sends described Frame.
2. the method for claim 1, it is characterised in that described acquisition optimum emission parameter includes: receive Access Control
Device calculates according to optimized algorithm and is configured to transmitting power and the antenna parameter of described access point.
3. the method for claim 1, it is characterised in that described acquisition optimum emission parameter includes: receive Access Control
Device recalculates according to optimized algorithm after covering performance changes in described overlay area and is configured to described access point
Launch power and antenna parameter.
4. a WLAN Coverage Control device, it is characterised in that described device includes:
Acquisition module, is used for obtaining optimum emission parameter, and described optimum emission parameter includes obtaining expectation covering performance and measurement
When the actual received signal strength of point and reception signal expectation strength error minimum, the transmitting power of access point and antenna parameter, institute
State zones of different in expectation covering performance includes being expected to overlay area and there is different signal intensitys；
Sending module, for the type according to current frame to be sent, uses described optimum emission parameter or adjusts according to multiple antennas
Degree algorithm calculates the emission parameter of gained and sends described current frame to be sent, and the type of described current frame to be sent includes managing frame
And Frame；
Described sending module includes:
First judging unit, is used for judging whether described current frame to be sent is described management frame；
First transmitting element, if judging that current frame to be sent is described management frame for described first judging unit, then uses institute
State optimum emission parameter and send described management frame；
Described sending module includes:
Second judging unit, is used for judging whether described current frame to be sent is described Frame；
Second transmitting element, if judging that current frame to be sent is described Frame for described second judging unit, then uses institute
State optimum emission parameter or calculate the emission parameter described Frame of transmission of gained according to multiple antenna scheduling algorithm.
5. device as claimed in claim 4, it is characterised in that described acquisition module includes:
First receives unit, for receiving the transmitting merit that access controller calculates according to optimized algorithm and is configured to described access point
Rate and antenna parameter.
6. device as claimed in claim 5, it is characterised in that described acquisition module includes:
Second receives unit, according to optimization after being used for receiving access controller covering performance changing in described overlay area
Algorithm recalculates and is configured to transmitting power and the antenna parameter of described access point.
7. a WLAN Coverage Control system, it is characterised in that described system includes access controller and access point；
Described access controller, if the performance parameter of dry measure point in obtaining overlay area, according to some in overlay area
Measuring the performance parameter of point, calculate optimum emission parameter, the performance parameter of described measurement point includes what described measurement point received
Propagation attenuation parameter between intensity or described measurement point and the access point of signal, described optimum emission parameter includes the acquisition phase
When hoping covering performance and measure the actual received signal strength of point with reception signal expectation strength error minimum, the transmitting merit of access point
Rate and antenna parameter, in described expectation covering performance includes being expected to overlay area, zones of different has different signal intensitys；
Described access point, calculates the optimum emission parameter of gained, according to current frame to be sent for obtaining described access controller
Type, use described optimum emission parameter or calculate the emission parameter of gained according to multiple antenna scheduling algorithm and send described working as
Front frame to be sent, the type of described current frame to be sent includes managing frame and Frame；
Described access point is additionally operable to: judge whether described current frame to be sent is described management frame；
If judging, current frame to be sent is described management frame, then use described optimum emission parameter to send described management frame；
Judge whether described current frame to be sent is described Frame；
If judging, current frame to be sent is described Frame, then use described optimum emission parameter or calculate according to multiple antenna scheduling
Method calculates the emission parameter of gained and sends described Frame.
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| CN104684007B (en) * | 2013-11-26 | 2018-05-25 | 智捷科技股份有限公司 | The automation handling capacity adapting method of wireless transmission |
| CN105992230A (en) * | 2015-03-04 | 2016-10-05 | 富士通株式会社 | Wireless network planning method and device |
| FR3060933A1 (en) * | 2016-12-15 | 2018-06-22 | Orange | METHOD FOR CONTROLLING RADIO SIGNAL ISSUED BY CORRESPONDING GATEWAY, GATEWAY AND COMPUTER PROGRAM |
| CN111698771B (en) * | 2019-03-15 | 2021-09-07 | 华为技术有限公司 | Power control method and device |
| CN110351669B (en) * | 2019-06-28 | 2022-05-31 | 南京中感微电子有限公司 | Bluetooth wireless broadcast transmitting and receiving method, equipment and communication system |
| CN117528422B (en) * | 2024-01-04 | 2024-03-29 | 深圳市博安智控科技有限公司 | Indoor environment wireless network coverage optimization method and device and network equipment |
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