CN102882567B - Antenna switching method, device and WAP - Google Patents
Antenna switching method, device and WAP Download PDFInfo
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Abstract
The invention provides a kind of antenna switching method, device and WAP, this antenna switching method comprises: message transmitted signal and the channel free signal of monitoring AP; If determine that AP is receiving message, obtain the first sampled value of the received power of omnidirectional antenna; If the first sampled value is than the high predetermined threshold of the second sampled value of the received power of the above-mentioned omnidirectional antenna of preserving, in at least one high-gain aerial of above-mentioned AP, carry out antenna switching, often once switch, received power to the current high-gain aerial being switched to is sampled, and obtains and preserve the sampled power of the current high-gain aerial being switched to; Above-mentioned at least one high-gain aerial all switch complete after, select high-gain aerial that sampled power is the highest as reception antenna. The present invention can realize the accuracy that improves antenna switching judging, strengthens the ascending power of website to AP, and then can meet large-scale covering demand.
Description
Technical field
The present invention relates to the communication technology, relate in particular to a kind of antenna switching method, device and WAP.
Background technology
In WLAN, WAP (AccessPoint; Hereinafter to be referred as: merit AP)Rate is larger, and website (Station; Hereinafter to be referred as: power STA) is lower, general AP and STAThe missionary society of power reach 10dB more than. Therefore for wireless coverage, from STA to APPower Limitation the scope of AP wireless coverage.
In prior art, the scheme that strengthens upward signal power mainly contains two kinds: Digital Signal Processing(DigitalSignalProcessing; Hereinafter to be referred as: DSP) and antenna handoff technique.
Wherein, DSP utilizes multiple reception antennas, receives the signal that STA sends simultaneously, passes throughAlgorithm, adjusts phase place and the amplitude of each antenna, thereby the general direction of multiple reception antennas is pointed toSTA, thus the gain of antenna is strengthened greatly, and corresponding STA receives signal also to be increased thereupon. ButThe cost of DSP is very high, and the construction cycle is long, is therefore seldom used.
Antenna handoff technique is to utilize multiple high-gain aerials to point to diverse location, once STA be detectedThe direction at place, by antenna alignment STA, thus the signal of enhancing STA. Prior art is generalAdopt the specific waveforms of detected transmission message or the mode of signal power, make antenna alignment STA. ButBe adopt aforesaid way, under the noisy environment of tool, interference can cause misjudgment, make antenna withoutMethod is aimed at STA, and the accuracy rate of antenna switching judging is lower.
Summary of the invention
The invention provides a kind of antenna switching method, device and WAP, cut to realize raising antennaChange the accuracy rate of judgement, strengthen the ascending power of STA to AP.
One aspect of the present invention provides a kind of antenna switching method, comprising:
Message transmitted signal and the channel free signal of monitoring wireless access point;
If just determining described WAP according to described message transmitted signal and described channel free signalReceiving message, the received power of the omnidirectional antenna to described WAP is sampled, and obtains instituteState the first sampled value of the received power of omnidirectional antenna;
If described the first sampled value is higher than the second sampled value of the received power of the described omnidirectional antenna of preservingPredetermined threshold carries out antenna switching at least one high-gain aerial of described WAP, everyOnce switch, the received power of the current high-gain aerial being switched to is sampled, obtain and protectDeposit the sampled power of the current high-gain aerial being switched to;
After the whole switchings of described at least one high-gain aerial are complete, select the highest height of sampled powerGain antenna is as reception antenna, until described message receives.
The present invention provides a kind of antenna-switching device on the other hand, comprising: monitoring modular, sampling module,Handover module, preservation module and selection module;
Described monitoring modular, for message transmitted signal and the channel free signal of monitoring wireless access point;
Described sampling module, for working as according to described message transmitted signal and the institute of described monitoring module monitorsState channel free signal and determine when described WAP is receiving message, to described WAPThe received power of omnidirectional antenna is sampled, and obtains the first sampled value of the received power of described omnidirectional antenna;
Described handover module, the institute preserving for described the first sampled value ratio obtaining when described sampling moduleWhile stating the high predetermined threshold of the second sampled value of received power of omnidirectional antenna, at described WAP extremelyIn a few high-gain aerial, carry out antenna switching;
Described sampling module, also in the time that described handover module often once switches, to current switchingTo the received power of high-gain aerial sample, obtain the sampling of the current high-gain aerial being switched toPower;
Described preservation module, for preserving the sampled power of the high-gain aerial that described sampling module obtains;
Described selection module, for after the whole switchings of described at least one high-gain aerial are complete, choosingSelect high-gain aerial that sampled power is the highest as reception antenna, until described message receives.
Further aspect of the present invention provides a kind of WAP, comprises antenna-switching device as above.
The technique effect of one aspect of the present invention is, the message transmitted signal of monitoring wireless access point and channel skyNot busy signal, is determining that according to message transmitted signal and channel free signal this WAP is receiving reportAfter literary composition, the received power of the omnidirectional antenna to this WAP is sampled, and obtains above-mentioned omnidirectional antennasThe first sampled value of the received power of line; If this first sampled value is than the reception merit of the omnidirectional antenna of preservingThe high predetermined threshold of the second sampled value of rate enters at least one high-gain aerial of this WAPRow antenna switches, and often once switches, and the received power of the current high-gain aerial being switched to is carried outSampling, the sampled power that obtains and preserve the current high-gain aerial being switched to; Above-mentioned at least one highGain antenna all switch complete after, select high-gain aerial that sampled power is the highest as reception antenna,Until above-mentioned message receives; Thereby can realize the accuracy that improves antenna switching judging, strengthen stationPoint arrives the ascending power of WAP, and then can meet large-scale covering demand.
Brief description of the drawings
Fig. 1 is the flow chart of an embodiment of antenna switching method of the present invention;
Fig. 2 is the flow chart of another embodiment of antenna switching method of the present invention;
Fig. 3 is the structural representation of an embodiment of antenna-switching device of the present invention;
Fig. 4 is the structural representation of another embodiment of antenna-switching device of the present invention;
Fig. 5 is the structural representation of another embodiment of antenna-switching device of the present invention.
Detailed description of the invention
Fig. 1 is the flow chart of an embodiment of antenna switching method of the present invention, as shown in Figure 1, and this antennaChanging method can comprise:
Step 101, message transmitted signal and the channel free signal of monitoring AP.
Step 102, if determine above-mentioned AP according to above-mentioned message transmitted signal and above-mentioned channel free signalReceiving message, the received power of the omnidirectional antenna to above-mentioned AP is sampled, and obtains above-mentioned completeTo the first sampled value of the received power of antenna.
Step 103, if above-mentioned the first sampled value is than second of the received power of this omnidirectional antenna of preservingThe high predetermined threshold of sampled value carries out antenna switching at least one high-gain aerial of above-mentioned AP,Often once switch, the received power of the current high-gain aerial being switched to is sampled, obtain alsoPreserve the sampled power of the current high-gain aerial being switched to.
Wherein, above-mentioned predetermined threshold can be 3dB, and the present invention is not limited to this certainly, above-mentioned predeterminedThe size of threshold value can, in the time of specific implementation, be set according to performance requirement or actual demand etc. voluntarily, thisThe bright size to above-mentioned predetermined threshold is not construed as limiting.
In the present embodiment, if above-mentioned the first sampled value is than the high predetermined threshold of the second sampled value, represent APReally receiving message, preventing from determining this according to above-mentioned message transmitted signal and above-mentioned channel free signalWhen AP is receiving message, there is erroneous judgement, thereby can improve the accuracy rate of antenna switching judging.
Step 104, after the whole switchings of above-mentioned at least one high-gain aerial are complete, selects sampling meritThe highest high-gain aerial of rate is as reception antenna, until above-mentioned message receives.
In above-described embodiment, when determining that according to message transmitted signal and the channel free signal of monitoring AP justIn the time receiving message, the received power of the omnidirectional antenna to this AP is sampled, and obtains above-mentioned omnidirectional antennasThe first sampled value of the received power of line, if above-mentioned the first sampled value connecing than this omnidirectional antenna of preservingThe high predetermined threshold of the second sampled value of receiving power carries out at least one high-gain aerial of this APAntenna switches, and often once switches, and the received power of the current high-gain aerial being switched to is adoptedSample, the sampled power that obtains and preserve the current high-gain aerial being switched to. In above-mentioned at least one high increasingBenefit antenna all switch complete after, select high-gain aerial that sampled power is the highest as reception antenna,Until above-mentioned message receives. Thereby can realize the accuracy that improves antenna switching judging, strengthen STATo the ascending power of AP, and then can meet large-scale covering demand.
Fig. 2 is the flow chart of another embodiment of antenna switching method of the present invention, as shown in Figure 2, and this skyLine changing method can comprise:
Step 201, controls the omnidirectional antenna of AP in listen mode, and reception to above-mentioned omnidirectional antennaPower is sampled, and obtains and preserve the second sampled value of the received power of this omnidirectional antenna. Then carry outStep 203.
Particularly, the received power of above-mentioned omnidirectional antenna is sampled, obtain and preserve this omnidirectional antennaThe second sampled value of received power can be: timing or the periodically received power to above-mentioned omnidirectional antennaSample, obtain the second sampled value of the received power of above-mentioned omnidirectional antenna, and with of this acquisitionTwo sampled values are upgraded last the second sampled value obtaining.
That is to say, can regularly or periodically sample to the received power of above-mentioned omnidirectional antenna, exampleAs: can sample to the received power of above-mentioned omnidirectional antenna every 5 microseconds, obtain above-mentioned omnidirectional antennasThe second sampled value of the received power of line, and preserve the second sampled value of up-to-date acquisition, by what preserve beforeThe second sampled value is deleted.
Step 202, the message of monitoring AP sends (Tx_frame) signal and channel idle (Rx_clear)Signal. Then perform step 203.
In the present embodiment, step 201 and step 202 executed in parallel, without sequencing.
Whether step 203, determine above-mentioned AP according to above-mentioned message transmitted signal and above-mentioned channel free signalReceiving message. If so, perform step 204; If according to above-mentioned message transmitted signal and upperState channel free signal, AP determines the current message that do not receive of this AP, returns to execution step 201 HesStep 202.
Particularly, message transmitted signal is that high level shows that AP is sending message, channel free signalThe channel that shows the current place of AP for high level does not have Energy Transfer. If therefore channel free signal isLow level, and message transmitted signal is low, shows the channel at the current place of AP, has energy passingDefeated, and be not that AP is sending message, AP is receiving message; If channel free signal is highLevel, shows that the channel at the current place of AP does not have energy at transmission, the i.e. current message that do not receive of AP.
Step 204, the received power of the omnidirectional antenna to this AP is sampled, and obtains above-mentioned omnidirectional antennaThe first sampled value of received power.
In the present embodiment, if determine this AP according to above-mentioned message transmitted signal and above-mentioned channel free signalReceiving message, the received power of the omnidirectional antenna to this AP is sampled immediately, obtains above-mentionedThe first sampled value of the received power of omnidirectional antenna.
Step 205, judges that the first sampled value is than the whether high predetermined threshold of the second sampled value of preserving. IfTo perform step 206; If the first sampled value is unlike the high predetermined threshold of above-mentioned the second sampled value,Execution step 208.
Wherein, above-mentioned predetermined threshold can be 3dB, and the present invention is not limited to this certainly, above-mentioned predeterminedThe size of threshold value can, in the time of specific implementation, be set according to performance requirement or actual demand etc. voluntarily, thisThe bright size to above-mentioned predetermined threshold is not construed as limiting.
In the present embodiment, if the first sampled value is than the high predetermined threshold of the second sampled value, represent that AP is trueThe real message that receiving. If the first sampled value, unlike the high predetermined threshold of above-mentioned the second sampled value, representsThe current message that do not receive of AP, this explanation is true according to above-mentioned message transmitted signal and above-mentioned channel free signalThere is erroneous judgement in fixed this AP, therefore, in the present embodiment, needs further to determine first while receiving messageSampled value is than after the high predetermined threshold of the second sampled value, then carries out antenna switching, thereby can improve antennaThe accuracy rate of switching judging.
Step 206 is carried out antenna switching at least one high-gain aerial of this AP, often carries out onceSwitch, the received power of the current high-gain aerial being switched to is sampled, obtain and preserve current cuttingThe sampled power of the high-gain aerial of changing to.
Step 207, after the whole switchings of above-mentioned at least one high-gain aerial are complete, selects sampling meritThe highest high-gain aerial of rate is as reception antenna, until above-mentioned message receives. This flow process finishes.
In the present embodiment, AP can determine that above-mentioned message receives according to above-mentioned channel free signal, asThe above-mentioned channel free signal of fruit is high level, shows that the channel at the current place of AP does not have energy in transmission,At this moment, AP can determine that above-mentioned message receives.
In the present embodiment, whole handoff procedures of above-mentioned at least one high-gain aerial, complete in 2 microsecondsBecome, can not destroy the demodulation of normal message.
Step 208, selects above-mentioned omnidirectional antenna as reception antenna, and returns to execution step 201 and stepRapid 202.
Above-described embodiment can be realized the accuracy that improves antenna switching judging, and enhancing STA is upper to AP'sRow power, and then can meet large-scale covering demand, and realize simply, cost is low.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the methodSuddenly can complete by the relevant hardware of programmed instruction. Aforesaid program can be stored in a computer canRead in storage medium. This program, in the time carrying out, is carried out the step that comprises above-mentioned each embodiment of the method; AndAforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. are various can be program code storedMedium.
Fig. 3 is the structural representation of an embodiment of antenna-switching device of the present invention, the sky in the present embodimentLine switching device shifter can be realized the present invention's flow process embodiment illustrated in fig. 1, and as shown in Figure 3, this antenna is cutChanging device can comprise: monitoring modular 31, sampling module 32, handover module 33, preservation module 34 andSelect module 35;
Monitoring modular 31, for monitoring message transmitted signal and the channel free signal of AP;
Sampling module 32, for the above-mentioned message transmitted signal when monitoring according to monitoring modular 31 and above-mentionedChannel free signal is determined when above-mentioned AP is receiving message, the reception merit of the omnidirectional antenna to above-mentioned APRate is sampled, and obtains the first sampled value of the received power of this omnidirectional antenna;
Handover module 33, the above-mentioned omnidirectional preserving for the first sampled value ratio obtaining when sampling module 32When the high predetermined threshold of the second sampled value of the received power of antenna, at least one high-gain of above-mentioned APIn antenna, carry out antenna switching; Wherein, above-mentioned predetermined threshold can be 3dB, and the present invention also not only certainlyBe limited to this, the size of above-mentioned predetermined threshold can be in the time of specific implementation, according to performance requirement or actual demandSet Deng voluntarily, the present invention is not construed as limiting the size of above-mentioned predetermined threshold;
Sampling module 32, also, in the time that handover module 33 often once switches, is switched to currentThe received power of high-gain aerial sample, obtain the sampling merit of the current high-gain aerial being switched toRate;
Preserve module 34, for preserving the sampled power of the high-gain aerial that sampling module 32 obtains;
Select module 35, for after the whole switchings of above-mentioned at least one high-gain aerial are complete, selectThe highest high-gain aerial of sampled power is as reception antenna, until above-mentioned message receives.
Above-mentioned antenna-switching device can improve the accuracy of antenna switching judging, strengthens STA to AP'sAscending power, and then can meet large-scale covering demand.
Fig. 4 is the structural representation of another embodiment of antenna-switching device of the present invention, in the present embodimentAntenna-switching device can be arranged in AP, realizes Fig. 1 of the present invention or flow process embodiment illustrated in fig. 2.Compared with the antenna-switching device providing embodiment illustrated in fig. 3, difference is, the sky shown in Fig. 4Line switching device shifter can also comprise: control module 36;
Control module 36, for the omnidirectional antenna of controlling AP in listen mode;
Sampling module 32, also samples for the received power to above-mentioned omnidirectional antenna, obtains above-mentioned completeTo the second sampled value of the received power of antenna;
Preserve module 34, also for preserving the received power of the above-mentioned omnidirectional antenna that sampling module 32 obtainsThe second sampled value.
Particularly, in the present embodiment, the received power of the omnidirectional antenna at sampling module 32 to AP is carried outSampling, before obtaining first sampled value of received power of above-mentioned omnidirectional antenna, monitors at monitoring modular 31When the message transmitted signal of AP and channel free signal, control module 36 is controlled the omnidirectional antennas of APLine is in listen mode, the omnidirectional antenna of controlling AP in control module 36 in listen mode orAfterwards, sampling module 32 is sampled to the received power of above-mentioned omnidirectional antenna, obtains above-mentioned omnidirectional antennaThe second sampled value of received power, then preserve module 34 and preserve above-mentioned complete that sampling module 32 obtainsTo the second sampled value of the received power of antenna.
After monitoring modular 31 is monitored the message transmitted signal and channel free signal of AP, if according toAbove-mentioned message transmitted signal and above-mentioned channel free signal are determined the current message that do not receive of AP, triggerControl module 36, sampling module 32 and preservation module 34 are carried out the omnidirectional antenna of controlling AP in monitoringPattern, and the received power of above-mentioned omnidirectional antenna is sampled, obtain and preserve connecing of omnidirectional antennaReceive the step of the second sampled value of power, and trigger monitoring modular 31 and carry out the message transmission of monitoring APThe step of signal and channel free signal.
Further, in above-mentioned antenna-switching device, select module 35, also for working as above-mentioned the first samplingWhile being worth unlike the high predetermined threshold of above-mentioned the second sampled value, select above-mentioned omnidirectional antenna as reception antenna, andTrigger control module 36, sampling module 32 and preserve module 34 carry out the omnidirectional antenna of controlling AP inListen mode, and the received power of above-mentioned omnidirectional antenna is sampled, obtain and preserve omnidirectional antennaThe step of the second sampled value of received power, and trigger monitoring modular 31 and carry out the message of monitoring APThe step of transmitted signal and channel free signal.
Particularly, sampling module 32 can regularly or periodically carry out the received power of above-mentioned omnidirectional antennaSample, obtain the second sampled value of the received power of above-mentioned omnidirectional antenna; Preserving module 34 can be with samplingThe second sampled value of module 32 these acquisitions is upgraded last the second sampled value obtaining of sampling module 32.
Above-mentioned antenna-switching device can improve the accuracy of antenna switching judging, strengthens STA to AP'sAscending power, and then can meet large-scale covering demand.
Fig. 5 is the structural representation of another embodiment of antenna-switching device of the present invention, as shown in Figure 5,This antenna-switching device can comprise: AP network interface card 51, coupler 52, power detection module 53, modulus(AnalogDigital; Hereinafter to be referred as: AD) sampling module 54, PLD 55 and antennaSwitch body 56.
Wherein, AP network interface card 51, for transmitting message transmitted signal and channel free signal.
Antenna switches body 56 can be controlled by PLD 55, and antenna switches body 56 and possesses at least oneThe switchable high-gain aerial of root, and an omnidirectional antenna.
PLD 55, switches the omnidirectional antenna of body 56 in listen mode for control antenna,And timing or the omnidirectional antenna of periodically notifying AD sampling module 54 to export power detection module 53Received power sample, for example: PLD 55 can be adopted every 5 microseconds notices ADThe received power of the omnidirectional antenna that original mold piece 54 is exported power detection module 53 is sampled, in acquisitionState the second sampled value of the received power of omnidirectional antenna, and with second of AD sampling module 54 these acquisitionsSampled value is upgraded last the second sampled value obtaining of AD sampling module 54. Meanwhile, programmable logic devicePart 55 is monitored message transmitted signal and the channel free signal that AP network interface card 51 transmits, according to above-mentioned messageTransmitted signal and above-mentioned channel free signal determine whether this AP is receiving message. If according to above-mentionedMessage transmitted signal and above-mentioned channel free signal are determined the current message that do not receive of this AP, continue everyThe reception merit of the omnidirectional antenna of power detection module 53 being exported every 5 microsecond notice AD sampling modules 54Rate is sampled, and obtains the second sampled value of the received power of above-mentioned omnidirectional antenna.
If PLD 55 is true according to above-mentioned message transmitted signal and above-mentioned channel free signalFixed this AP is receiving message, and it is right that PLD 55 is notified AD sampling module 54 immediatelyThe received power of the omnidirectional antenna that power detection module 53 is exported is once sampled, and obtains above-mentioned omnidirectional antennasThe first sampled value of the received power of line. Next, PLD 55 judges the first sampled value ratioThe whether high predetermined threshold of the second sampled value of preserving, if so, PLD 55 control antennasIn at least one high-gain aerial that switching body 56 comprises at antenna switching body 56, carry out antenna switching, everyOnce switch, PLD 55 notifies AD sampling module 54 to power detection module 53The received power of the current high-gain aerial being switched to of output is sampled, and obtains and preserve current switchingThe sampled power of the high-gain aerial arriving. After the whole switchings of above-mentioned high-gain aerial are complete, able to programmeLogical device 55 selects high-gain aerial that sampled power is the highest as reception antenna, until above-mentioned message connectsHarvest complete. In the present embodiment, whole handoff procedures of above-mentioned high-gain aerial complete in 2 microseconds, noCan destroy the demodulation of normal message.
If above-mentioned the first sampled value is unlike the high predetermined threshold of the second sampled value of preserving, FPGADevice 55 selects the omnidirectional antenna of antenna switching body 56 as reception antenna.
Wherein, above-mentioned predetermined threshold can be 3dB, and the present invention is not limited to this certainly, above-mentioned predeterminedThe size of threshold value can, in the time of specific implementation, be set according to performance requirement or actual demand etc. voluntarily, thisThe bright size to above-mentioned predetermined threshold is not construed as limiting.
In the time of specific implementation, above-mentioned PLD 55 can adopt CPLD(ComplexProgrammableLogicDevice; Hereinafter to be referred as: CPLD) or field programmable gateArray (FieldProgrammableGateArray; Hereinafter to be referred as: FPGA) etc., the present invention is not to thisBe construed as limiting.
In the present embodiment, coupler 52 switches by antenna the antenna power that body 56 exports and is divided into two-way respectivelyPass to AP network interface card 51 and power detection module 53. Particularly, coupler 52 can switch antennaThe antenna power that body 56 is exported for example, is divided into two-way by predetermined ratio (: 10: 1) and passes to respectively AP netCard 51 and power detection module 53.
AP network interface card 51 is also for utilizing the antenna power that coupler 52 transmits to receive the message that STA sends.
Power detection module 53 detects for the antenna power that coupler 52 is transmitted, and obtains antennaSwitch the received power of body 56 antennas used, and the received power of acquisition is exported to AD sampling module 54.
AD sampling module 54, for after receiving the notice of PLD 55, to powerThe received power that detection module 53 is exported is sampled.
In the present embodiment, the just size of part received power that power detection module 53 obtains, still,Because coupler 52 is all according to identical ratio, antenna to be switched to the antenna power that body 56 exports to be divided into twoRoad, the received power that therefore AD sampling module 54 is exported power detection module 53 obtains after samplingSampled value, can reflect and the magnitude relationship of antenna power not affect realization of the present invention.
In the present embodiment, AP network interface card 51 can be realized Fig. 3 of the present invention and middle monitoring embodiment illustrated in fig. 4The function of module 31; Above-mentioned PLD 55 and AD sampling module 54 can be realized the present inventionThe function of Fig. 3 and middle sampling module 32 embodiment illustrated in fig. 4; PLD 55 and antenna are cutChange body 56 and can realize the function of Fig. 3 of the present invention and middle handover module 33 embodiment illustrated in fig. 4; Can compileJourney logical device 55 can be realized Fig. 3 of the present invention and middle preservation module 34 embodiment illustrated in fig. 4 and selectThe function of module 35; Further, PLD 55 can also be realized shown in Fig. 4 of the present inventionThe function of control module 36 in embodiment.
Above-mentioned antenna-switching device can make STA greatly strengthen to the signal of AP, thereby meets on a large scaleThe demand covering. And it is high that above-mentioned antenna-switching device has switching judging accuracy rate, the advantage that cost is low.
The present invention also provides a kind of AP, and this AP can comprise shown in Fig. 3 of the present invention, Fig. 4 or Fig. 5 realExecute the antenna-switching device that example provides.
Finally it should be noted that: above each embodiment is only in order to technical scheme of the present invention to be described, but not rightIts restriction; Although the present invention is had been described in detail with reference to aforementioned each embodiment, this area commonTechnical staff is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified,Or some or all of technical characterictic is wherein equal to replacement; And these amendments or replacement, andDo not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (8)
1. an antenna switching method, is characterized in that, comprising:
Message transmitted signal and the channel free signal of monitoring wireless access point;
If just determining described WAP according to described message transmitted signal and described channel free signalReceiving message, the received power of the omnidirectional antenna to described WAP is sampled, and obtains instituteState the first sampled value of the received power of omnidirectional antenna;
If described the first sampled value is higher than the second sampled value of the received power of the described omnidirectional antenna of preservingPredetermined threshold carries out antenna switching at least one high-gain aerial of described WAP, everyOnce switch, the received power of the current high-gain aerial being switched to is sampled, obtain and protectDeposit the sampled power of the current high-gain aerial being switched to;
After the whole switchings of described at least one high-gain aerial are complete, select the highest height of sampled powerGain antenna is as reception antenna, until described message receives;
The received power of the described omnidirectional antenna to described WAP is sampled, and obtains described omnidirectionalBefore the first sampled value of the received power of antenna, also comprise:
Control the omnidirectional antenna of described WAP in listen mode, and connecing described omnidirectional antennaReceive power and sample, obtain and preserve the second sampled value of the received power of described omnidirectional antenna.
2. method according to claim 1, is characterized in that, the report of described monitoring wireless access pointAfter literary composition transmitted signal and channel free signal, also comprise:
If determine that according to described message transmitted signal and described channel free signal described WAP oughtBefore do not receive message, carry out the omnidirectional antenna of the described WAP of described control in listen mode,And the received power of described omnidirectional antenna is sampled, obtain and preserve the reception merit of described omnidirectional antennaThe step of the second sampled value of rate, and carry out message transmitted signal and the letter of described monitoring wireless access pointThe step of road idle signal.
3. method according to claim 1, is characterized in that, described to described WAPThe received power of omnidirectional antenna is sampled, and obtains the first sampled value of the received power of described omnidirectional antennaAfterwards, also comprise:
If described the first sampled value, unlike the high predetermined threshold of described the second sampled value, is selected described omnidirectionalAntenna is as reception antenna, and the omnidirectional antenna of carrying out the described WAP of described control is in monitoring mouldFormula, and the received power of described omnidirectional antenna is sampled, obtain and preserve connecing of described omnidirectional antennaReceive the step of the second sampled value of power, and carry out the message transmitted signal of described monitoring wireless access pointStep with channel free signal.
4. according to the method described in claim 1-3 any one, it is characterized in that, described to described completeReceived power to antenna is sampled, and obtains and preserve second the adopting of received power of described omnidirectional antennaSample value comprises:
Timing or periodicity are sampled to the received power of described omnidirectional antenna, obtain described omnidirectional antennaThe second sampled value of received power, and with the second sampled value of this acquisition upgrade last obtain theTwo sampled values.
5. an antenna-switching device, is characterized in that, comprising: monitoring modular, sampling module, switchingModule, preservation module and selection module;
Described monitoring modular, for message transmitted signal and the channel free signal of monitoring wireless access point;
Described sampling module, for working as according to described message transmitted signal and the institute of described monitoring module monitorsState channel free signal and determine when described WAP is receiving message, to described WAPThe received power of omnidirectional antenna is sampled, and obtains the first sampled value of the received power of described omnidirectional antenna;
Described handover module, the institute preserving for described the first sampled value ratio obtaining when described sampling moduleWhile stating the high predetermined threshold of the second sampled value of received power of omnidirectional antenna, at described WAP extremelyIn a few high-gain aerial, carry out antenna switching;
Described sampling module, also in the time that described handover module often once switches, to current switchingTo the received power of high-gain aerial sample, obtain the sampling of the current high-gain aerial being switched toPower;
Described preservation module, for preserving the sampled power of the high-gain aerial that described sampling module obtains;
Described selection module, for after the whole switchings of described at least one high-gain aerial are complete, choosingSelect high-gain aerial that sampled power is the highest as reception antenna, until described message receives;
Also comprise: control module;
Described control module, for the omnidirectional antenna of controlling described WAP in listen mode;
Described sampling module, also samples for the received power to described omnidirectional antenna, described in acquisitionThe second sampled value of the received power of omnidirectional antenna;
Described preservation module, also for preserving the reception merit of the described omnidirectional antenna that described sampling module obtainsThe second sampled value of rate.
6. device according to claim 5, is characterized in that,
Described selection module, also for working as described the first sampled value unlike the high predetermined threshold of described the second sampled valueWhen value, select described omnidirectional antenna as reception antenna, and trigger described control module, described sampling mouldPiece and described preservation module are carried out the omnidirectional antenna of controlling described WAP in listen mode, and rightThe received power of described omnidirectional antenna is sampled, and obtains and preserve the received power of described omnidirectional antennaThe step of the second sampled value, and trigger described monitoring modular and carry out the message of monitoring wireless access point and sendThe step of signal and channel free signal.
7. according to the device described in claim 5-6 any one, it is characterized in that,
Described sampling module, carries out the received power of described omnidirectional antenna specifically for timing or periodicitySample, obtain the second sampled value of the received power of described omnidirectional antenna;
Described preservation module, upgrades institute specifically for the second sampled value with described this acquisition of sampling moduleState last the second sampled value obtaining of sampling module.
8. a WAP, is characterized in that, comprises as described in claim 5-7 any oneAntenna-switching device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210202712.2A CN102882567B (en) | 2012-06-18 | 2012-06-18 | Antenna switching method, device and WAP |
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| CN201210202712.2A CN102882567B (en) | 2012-06-18 | 2012-06-18 | Antenna switching method, device and WAP |
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| CN102882567A CN102882567A (en) | 2013-01-16 |
| CN102882567B true CN102882567B (en) | 2016-05-04 |
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| US9100100B2 (en) * | 2013-12-31 | 2015-08-04 | Futurewei Technologies, Inc. | Wireless electronic device with switchable antenna system |
| US10681479B2 (en) | 2015-01-30 | 2020-06-09 | Cassia Networks Inc. | Methods, devices and systems for bluetooth audio transmission |
| US10178494B2 (en) | 2015-01-30 | 2019-01-08 | Cassia Networks Inc. | Bluetooth transparent relay |
| US9769594B2 (en) | 2015-01-30 | 2017-09-19 | Cassia Networks Inc. | Methods, devices and systems for increasing wireless communication range |
| CN104883218B (en) * | 2015-05-13 | 2018-08-07 | 国家电网公司 | High voltage transmission line based on beam switchover sets up region UAV Communication device and the method with UAV Communication |
| CN113824473B (en) * | 2021-09-30 | 2023-07-21 | 联想(北京)有限公司 | Control method, device and communication system |
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