CN103945409A - Wireless link quality detection method and device - Google Patents

Wireless link quality detection method and device Download PDF

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Publication number
CN103945409A
CN103945409A CN201410106220.2A CN201410106220A CN103945409A CN 103945409 A CN103945409 A CN 103945409A CN 201410106220 A CN201410106220 A CN 201410106220A CN 103945409 A CN103945409 A CN 103945409A
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sta
transmitting power
signal strength
power
strength values
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CN103945409B (en
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聂树伟
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Hangzhou H3C Technologies Co Ltd
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Hangzhou H3C Technologies Co Ltd
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Abstract

The invention provides a wireless link quality detection method and device. The method includes the steps that according to acquired transmitting power of a terminal STA, transmitting power between an AP and the STA is adjusted, and the AP sends a detection message to the STA according to the adjusted transmitting power of the AP; based on a response message, returned by the STA for the detection message, acquired by the AP, a signal intensity value from the STA to the AP and current transmitting power of the STA are acquired; according to the transmitting power of the AP before adjustment, the signal intensity value from the STA to the AP and the current transmitting power of the STA, a signal intensity value from the AP to the STA is determined. By the adoption of the wireless link quality detection method and device, the problem that in the prior art, signal intensity from the AP to the STA cannot be determined is solved.

Description

A kind of detection method of radio link quality and device
Technical field
The present invention relates to communication technical field, particularly a kind of detection method of radio link quality and device.
Background technology
At present, WLAN (Wireless Local Area Networks, WLAN) application is more and more universal, and thing followed problem is ruuning situation, the especially signal coverage varies how network design and keeper hold whole network accurately.The transmission medium of WLAN is air, when a terminal (station, STA) is successfully connected to an access point (Access Point, AP) above, need to understand the link-quality of this connection, to adjust.
The realization of existing radio link quality test is: utilize AP to send message to STA, and obtain the signal strength values of STA response message.But this signal strength signal intensity is the signal strength values of STA to AP, prior art scheme cannot be determined the signal strength signal intensity of AP to STA.
Summary of the invention
In view of this, the invention provides a kind of detection method and device of radio link quality, cannot determine the signal strength problem of AP to STA to solve in prior art.
The embodiment of the present invention provides a kind of detection method of radio link quality, comprising:
According to the transmitting power of the terminal STA obtaining, adjust the transmitting power between access point AP and STA, and utilize the transmitting power of the AP after adjusting to send probe messages by AP to described STA;
The response message that the described STA obtaining based on AP returns for described probe messages, obtains the signal strength values of STA to AP, and the current transmit power of STA;
Transmitting power before adjusting according to AP, and described STA is to the current transmit power of signal strength values and the STA of AP, determines the signal strength values of AP to STA.
Preferably, described according to the transmitting power of the terminal STA obtaining, adjust the transmitting power between access point AP and STA, specifically comprise:
According to the transmitting power of STA obtaining, when the transmitting power that judges described STA is less than or equal to the transmitting power of access point AP, the transmitting power that the transmitting power of adjusting AP is described STA.
Preferably, described according to the transmitting power of the terminal STA obtaining, adjust the transmitting power between access point AP and STA, specifically comprise:
According to the transmitting power of the terminal STA obtaining, when the transmitting power that judges described STA is greater than the transmitting power of access point AP, the transmitting power that maintains AP is constant, and transmission power indicative information is given described STA, indicate described STA to adjust transmitting power, using the transmitting power of described AP as maximum transmission power work;
Obtain the transmitting power after described STA adjusts, and the transmitting power of AP is adjusted into identical with the transmitting power after described STA adjustment.
Preferably, described definite AP, after the signal strength values of STA, further comprises:
Utilize AP to STA transmitted power message recovery, described power message recovery is used to indicate and makes STA return to the transmitting power work before of the described power Indication message of reception.
Preferably, described method further comprises:
Utilize the transmitting power of the AP after adjusting to send multiple probe messages by AP to described STA;
The response message that the described described STA obtaining based on AP returns for described probe messages, obtains the signal strength values of STA to AP, specifically comprises:
The multiple response messages that return for described multiple probe messages that obtain based on AP, obtain STA that described multiple response message the is corresponding mean value to multiple signal strength values of AP, arrive the signal strength values of AP using described mean value as STA.
Preferably, utilize following formula to calculate the signal strength values of AP to STA:
RSSI A-S=P+M;
Wherein, RSSI a-Sfor AP is to the signal strength values of STA, P is the transmitting power before AP adjusts, and M is the difference of described STA to the signal strength values of AP and the current transmit power of described STA.
The embodiment of the present invention also provides a kind of checkout gear of radio link quality, comprising:
Adjustment unit, for according to the transmitting power of the terminal STA obtaining, adjusts the transmitting power between access point AP and STA, and utilizes the transmitting power of the AP after adjusting to send probe messages by AP to described STA;
Acquiring unit, the response message returning for described probe messages for the described STA obtaining based on AP, obtains the signal strength values of STA to AP, and the current transmit power of STA;
Determining unit, for the transmitting power before adjusting according to AP, and described STA is to the current transmit power of signal strength values and the STA of AP, determines the signal strength values of AP to STA.
Preferably, described adjustment unit, specifically for according to the transmitting power of STA obtaining, when the transmitting power that judges described STA is less than or equal to the transmitting power of access point AP, the transmitting power that the transmitting power of adjusting AP is described STA.
Preferably, described adjustment unit, specifically for according to the transmitting power of terminal STA obtaining, when the transmitting power that judges described STA is greater than the transmitting power of access point AP, the transmitting power that maintains AP is constant, and transmission power indicative information gives described STA, indicate described STA to adjust transmitting power, using the transmitting power of described AP as maximum transmission power work; And obtain the transmitting power after described STA adjusts, and the transmitting power of AP is adjusted into identical with the transmitting power after described STA adjustment.
Preferably, described device also comprises: recovery unit, be used at definite AP, after the signal strength values of STA, utilizing AP to STA transmitted power message recovery, described power message recovery is used to indicate and makes STA return to the transmitting power work before of the described power Indication message of reception.
Preferably, described adjustment unit, sends multiple probe messages by AP to described STA specifically for the transmitting power of utilizing the AP after adjusting;
Described acquiring unit, specifically for the multiple response messages that return for described multiple probe messages that obtain based on AP, obtain STA that described multiple response message the is corresponding mean value to multiple signal strength values of AP, using described mean value as STA to the signal strength values of AP.
Preferably, utilize following formula to calculate the signal strength values of AP to STA:
RSSI A-S=P+M;
Wherein, RSSI a-Sfor AP is to the signal strength values of STA, P is the transmitting power before AP adjusts, and M is the difference of described STA to the signal strength values of AP and the current transmit power of described STA.
The embodiment of the present invention provides a kind of detection method and device of radio link quality, according to the transmitting power of the terminal STA obtaining, adjust the transmitting power between access point AP and STA, and utilize the transmitting power of adjusting rear AP to send probe messages to STA, the response message that the described STA obtaining based on AP returns for described probe messages, obtain the signal strength values of STA to AP, and the current transmit power of STA, and according to the transmitting power before AP adjustment, obtain the signal strength values of AP to STA, thereby solve in prior art and cannot determine the signal strength problem of AP to STA.
Brief description of the drawings
Fig. 1 is the method flow diagram that the embodiment of the present invention provides;
Fig. 2 is the method for adjustment flow chart for transmitting power between access point AP and terminal STA that the embodiment of the present invention provides;
Fig. 3 is the acquisition methods flow chart of the link complete attenuation value that provides of the embodiment of the present invention;
Fig. 4 is the apparatus structure schematic diagram that the embodiment of the present invention provides;
Fig. 5 is the hardware configuration schematic diagram that the embodiment of the present invention provides.
Embodiment
According to prior art, for the detection of the two-way link quality of wireless connections, prior art is by utilizing AP to send probe messages to STA, the response message that the STA obtaining according to AP returns for this probe messages, obtain the signal strength values of STA to AP, but prior art scheme cannot be determined the signal strength signal intensity of AP to STA.Because wireless connections are two-way, in the time that connection is adjusted, if can understand the signal strength signal intensity (Receive Signal Strength Indicator, RSSI) from wireless aps to STA, and STA is to the signal strength signal intensity of AP, just stronger to connecting the specific aim of adjusting so.
For the problems referred to above, the embodiment of the present invention provides a kind of detection method of radio link quality, and the method can comprise the following steps:
According to the transmitting power of the terminal STA obtaining, adjust the transmitting power between access point AP and STA, and utilize the transmitting power of the AP after adjusting to send probe messages by AP to described STA;
The response message that the described STA obtaining based on AP returns for described probe messages, obtains the signal strength values of STA to AP, and the current transmit power of STA;
Transmitting power before adjusting according to AP, and described STA is to the current transmit power of signal strength values and the STA of AP, determines the signal strength values of AP to STA.
The said method that the embodiment of the present invention provides, can be deployed in the such network equipment of access point controller, also can dispose other except access point controller and have the network equipment of similar functions.The method is by adjusting the transmitting power on AP, to STA emission detection message, and the signal strength values according to the STA getting to AP, the current transmit power of STA, and transmitting power before AP adjustment, determine the signal strength values of AP to STA.
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 clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the detection method of a kind of radio link quality providing for the embodiment of the present invention, the method can comprise the following steps:
Step 101: according to the transmitting power of the terminal STA obtaining, adjust the transmitting power between access point AP and STA, and utilize the transmitting power of the AP after adjusting to send probe messages by AP to described STA;
Wherein, wireless terminal STA comprises two kinds of band power mode Power states: awake mode Awake and park mode Doze.When STA is during in Awake state, STA works within the scope of the high transmit power of self; When STA is during in Doze state, STA cannot intercept channel.Therefore,, for the detection of radio link quality, carry out under Awake state at STA.
In real work, STA has a set of power of oneself and adjusts scheme, and in the time that STA receives the probe messages of access point (Access Point, AP) transmission, STA can be with this probe messages of power response after adjusting.When STA is during with transmitting power response AP after adjusting, AP can get the transmitting power after STA adjusts, the i.e. current transmit power of STA herein.
In the wireless networking of the embodiment of the present invention, AP and Radio Access Controller (Access Controller, AC) connect, and AC manages concentratedly and controls the AP in wireless networking, wherein, and AP and AC wired connection.In the present embodiment, the executive agent of step 101-step 103 just refers to AC equipment, and the signal of the STA that AC equipment can receive according to AP equipment is determined the transmitting power of STA, and adjust the transmitting power of AP, and can indicate AP with the transmitting power work after adjusting.
It will be appreciated by those skilled in the art that; in some wireless networkings; some AP also may bear centralized management and control; or bear part management and control function; in this case; the executive agent of step 101-step 103 can refer to these AP equipment; in fact; in actual networking applied environment; conventionally have the function that the network equipment that has management and control function performs step 101-step 103; this the present embodiment is not particularly limited executive agent, as long as carrying out the equipment of these functions.
As shown in Figure 2, be the method for adjustment of transmitting power between access point AP and terminal STA, in embodiments of the present invention, this method of adjustment can comprise the following steps:
Step 1011: carry out in the process of wireless connections at STA and AP, obtain the transmitting power S of STA in the power capability territory (Power Capability element) in the association request message sending to AP according to STA;
Step 1012: according to the transmitting power S of the STA obtaining, judge the magnitude relationship of the transmitting power S of STA and the transmitting power P of AP, in the time judging that the transmitting power S of described STA is less than or equal to the transmitting power P of AP, jump procedure 1013; In the time judging that the transmitting power S of described STA is greater than the transmitting power P of access point AP, jump procedure 1014;
Step 1013: the transmitting power that the transmitting power of adjusting AP is described STA, finishes;
Step 1014: the transmitting power that maintains AP is constant, and transmission power indicative information gives described STA, indicates described STA to adjust transmitting power, using the transmitting power of described AP as maximum transmission power work;
Step 1015: obtain the transmitting power after described STA adjusts, and the transmitting power of AP is adjusted into identical with the transmitting power after described STA adjustment.
In the step 1013 and step 1015 of the embodiment of the present invention, in transmitting power after the transmitting power of AP being adjusted into the transmitting power of STA and adjusting, the antenna number that the radio type of AP and AP can also be used be adjusted into the wireless type of STA and use antenna number identical, thereby makes the STA obtaining in subsequent step more accurate to the signal strength values of AP and the current transmit power of STA.
Wherein, the executive agent of this step 1011-step 1015 is AC, wherein obtains the transmitting power of STA, and transmission power indicative information is specifically realized by AP by AC.Because AC is the control centre of whole network, therefore, it is all to be managed and controlled by AC that AP carries out information transmission with which kind of parameter, and AP plays an average information and sends and transfer function.
For example, in step 1011, when STA is successfully connected to AP, when the wireless type of acquisition STA is the arbitrary type in 802.11b, 802.11g, 802.11a or 802.11ac,, in step 1013 and step 1015, the radio type of AP is adjusted into the wireless type of STA.
Step 102: the response message that the described STA obtaining based on AP returns for described probe messages, obtain the signal strength values of STA to AP, and the current transmit power of STA;
Step 103: the transmitting power before adjusting according to AP, and described STA is to the current transmit power of signal strength values and the STA of AP, determines the signal strength values of AP to STA.
In embodiments of the present invention, be described taking the transmitting power S of the transmitting power P of AP and the STA of acquisition as the scheme that example provides the embodiment of the present invention.
In embodiments of the present invention, AC receives by AP the response message that STA returns for probe messages, and wherein, the receiver of AP end, by this response message of antenna reception, by detecting the intensity of this response message, obtains the signal strength values RSSI of STA to AP s-A, and the current transmit power S of the STA carrying in acquisition response message 0.Wherein, this STA obtaining is to the signal strength values RSSI of AP s-A, be the signal strength signal intensity of STA through STA to the value after the link attenuation of AP.
Further, in order to obtain more accurately STA to the signal strength values RSSI of AP s-A, can utilize the transmitting power of the AP after adjustment to send multiple probe messages by AP to described STA;
The response message that the described described STA obtaining based on AP returns for described probe messages, obtains the signal strength values of STA to AP, specifically comprises:
The multiple response messages that return for described multiple probe messages that obtain based on AP, obtain STA that described multiple response message the is corresponding mean value to multiple signal strength values of AP, arrive the signal strength values RSSI of AP using described mean value as STA s-A.Like this, by sending multiple probe messages, and obtain corresponding multiple response message, more accurate to the signal strength values of AP as STA by obtaining the mean value of signal strength signal intensity of the plurality of response message.
In embodiments of the present invention, can utilize following formula to calculate the signal strength values of AP to STA:
RSSI A-S=P+M; (1)
Wherein, RSSI a-Sfor AP is to the signal strength values of STA, P is the transmitting power before AP adjusts, and M is link complete attenuation.This link complete attenuation mainly comprises path attenuation X and ground noise N.
Because P is known, therefore need to obtain the value of link complete attenuation M, the embodiment of the present invention obtains this M value by the following method.
As shown in Figure 3, the method for this acquisition M value can comprise the following steps:
Step 301: according to the current transmit power S of STA 0, judge S 0with the relation of the transmitting power S of the terminal STA of acquisition in step 101, if judged result is S 0=S, jump procedure 302, if judged result is S 0≠ S, jump procedure 303;
Step 302: if judged result is S 0=S, RSSI s-A=RSSI a-S;
Because transmitting radio frequency, use antenna number and the link attenuation of AP are all consistent with STA, the STA that the response message therefore returning according to STA obtains is to the signal strength values RSSI of AP s-Awith the signal strength values RSSI that sees AP on STA a-Scan think identical;
According to formula (1) RSSI a-S=P+M, obtains M=RSSI a-S-P=RSSI s-A-S=RSSI s-A-S 0;
Step 303: if judged result is S 0≠ S, STA has used Modulating Power, obtains M=RSSI according to formula (1) s-A-S+ (S-S 0)=RSSI s-A-S 0.Wherein, if S 0=S, link complete attenuation M=RSSI s-A-S; But S 0≠ S, therefore link complete attenuation M is at RSSI s-A(S-S has decayed again on the basis of-S 0).
According to such scheme, no matter S 0whether equal S, link complete attenuation M=RSSI s-A-S 0.Be that link complete attenuation M is the signal strength values RSSI of STA to AP s-Acurrent transmit power S with STA 0difference.
Therefore, the transmitting power P before adjusting according to AP, and described STA is to the signal strength values RSSI of AP s-Acurrent transmit power S with STA 0, and utilize formula (1) to determine the signal strength values RSSI of AP to STA a-S.
Further, determining the signal strength values RSSI of AP to STA according to the method for the embodiment of the present invention a-Safterwards, the transmitting power that also needs AC to adjust AP returns to the transmitting power P before adjusting.And AC utilizes AP to STA transmitted power message recovery, described power message recovery is used to indicate the transmitting power work that STA is returned to receive before described power Indication message.
The method providing according to the embodiment of the present invention, can control AP and STA and use different emission rates to detect under different emission rates STA to the signal strength values RSSI of AP s-Awith the signal strength values RSSI of AP to STA a-S, to according to the signal strength values obtaining, wireless network is adjusted, guarantee that in wireless network, each link has best signal transmission performance.
As shown in table 1, for emission rate is respectively under 6Mbps and 9Mbps, the radio link quality test result of AP and STA.
Table 1:
Wherein, TxCnt sends message number, and RxCnt is for receiving message number, and Retries is number of retransmissions, RTT is the time interval that receives response message after transmission message, and TxCnt, RxCnt, Retries, RTT are the parameter obtaining in the process of the radio link quality test to AP and STA.At No.0, AC utilizes AP to send probe messages with emission rate 6Mbps to STA, wherein, the probe messages number that AC sends to STA altogether by AP is 5, and the response message number that AC receives by AP is 5, in the process sending in probe messages, system stability, there is not retransmitting phenomenon, and RTT is 0 in table 1, therefore to send out probe messages shorter to the time interval that receives response message, the method providing according to the embodiment of the present invention, obtaining STA is that 55, AP is 57 to the signal strength values of STA to the signal strength values of AP.In like manner, in table 1, AC utilizes AP to send probe messages with emission rate 9Mbps to STA, and obtaining STA is that 56, AP is 58 to the signal strength values of STA to the signal strength values of AP.
In embodiments of the present invention, the signal strength values RSSI to AP according to the STA obtaining s-Aand AP is to the signal strength values RSSI of STA a-P, obtain the two-way link quality of STA and AP wireless connections link.
The said method providing according to the embodiment of the present invention, by adjusting the transmitting power on AP, to STA emission detection message, get the current transmit power of STA to signal strength values and the STA of AP, transmitting power before adjusting according to AP, thus determine the signal strength values of AP to STA.Can obtain like this in wireless network the two-way link quality of link between AP and STA, be conducive to wireless network to be adjusted, to guarantee that in wireless network, each link can have best signal transmission performance.
Based on the design identical with method, the present invention also provides a kind of checkout gear 40 of radio link quality, is deployed in the such network equipment of access point controller, also can dispose other except access point controller and have the network equipment of similar functions.As shown in Figure 4, this device 40 can comprise:
Adjustment unit 401, for according to the transmitting power of the terminal STA obtaining, adjusts the transmitting power between access point AP and STA, and utilizes the transmitting power of the AP after adjusting to send probe messages by AP to described STA;
Acquiring unit 402, the response message returning for described probe messages for the described STA obtaining based on AP, obtains the signal strength values of STA to AP, and the current transmit power of STA;
Determining unit 403, for the transmitting power before adjusting according to AP, and described STA is to the current transmit power of signal strength values and the STA of AP, determines the signal strength values of AP to STA.
The specific implementation process of the device 40 that the embodiment of the present invention provides can, referring to the explanation of said method embodiment, not repeat them here.
In said apparatus 40, described adjustment unit 401, specifically can be used for according to the transmitting power of STA obtaining, when the transmitting power that judges described STA is less than or equal to the transmitting power of access point AP, and the transmitting power that the transmitting power of adjusting AP is described STA.
In said apparatus 40, described adjustment unit 401, specifically for according to the transmitting power of terminal STA obtaining, when the transmitting power that judges described STA is greater than the transmitting power of access point AP, the transmitting power that maintains AP is constant, and transmission power indicative information gives described STA, indicate described STA to adjust transmitting power, using the transmitting power of described AP as maximum transmission power work; And obtain the transmitting power after described STA adjusts, and the transmitting power of AP is adjusted into identical with the transmitting power after described STA adjustment.Correspondingly, this device 40 also can comprise: recovery unit 404, be used at definite AP, after the signal strength values of STA, utilizing AP to STA transmitted power message recovery, described power message recovery is used to indicate and makes STA return to the transmitting power work before of the described power Indication message of reception.
In said apparatus 40, described adjustment unit 401, specifically can be used for utilizing the transmitting power of the AP after adjusting to send multiple probe messages by AP to described STA; Described acquiring unit 402, specifically can be used for the multiple response messages that return for described multiple probe messages that obtain based on AP, obtain STA that described multiple response message the is corresponding mean value to multiple signal strength values of AP, using described mean value as STA to the signal strength values of AP.
In said apparatus 40, specifically can utilize following formula to calculate the signal strength values of AP to STA:
RSSI A-S=P+M;
Wherein, RSSI a-Sfor AP is to the signal strength values of STA, P is the transmitting power before AP adjusts, and M is the difference of described STA to the signal strength values of AP and the current transmit power of described STA.
As shown in Figure 5, the present embodiment device corresponding with detection method above-mentioned a kind of radio link quality that provide, specifically also can realize by the hardware shown in Fig. 5, particularly, controller (CPU) in Fig. 5 is connected with memory and other hardware, wherein, deposited program or instruction in memory, CPU can be by program or instruction in read memory, carry out corresponding operation, other hardware, can be specifically communication interface etc., can receive or send message.
Particularly, CPU, by program or instruction in read memory, can carry out following operation:
CPU, by fetch program or instruction, for according to the transmitting power of the terminal STA obtaining, adjusts the transmitting power between access point AP and STA, and utilizes the transmitting power of the AP after adjusting to send probe messages by AP to described STA; The response message that the described STA obtaining based on AP returns for described probe messages, obtains the signal strength values of STA to AP, and the current transmit power of STA; Transmitting power before adjusting according to AP, and described STA is to the current transmit power of signal strength values and the STA of AP, determines the signal strength values of AP to STA.
CPU is by fetch program or instruction, for according to the transmitting power of the STA obtaining, and when the transmitting power that judges described STA is less than or equal to the transmitting power of access point AP, the transmitting power that the transmitting power of adjusting AP is described STA.
CPU is by fetch program or instruction, be used for according to the transmitting power of the terminal STA obtaining, when the transmitting power that judges described STA is greater than the transmitting power of access point AP, the transmitting power that maintains AP is constant, and transmission power indicative information is given described STA, indicate described STA to adjust transmitting power, using the transmitting power of described AP as maximum transmission power work; And obtain the transmitting power after described STA adjusts, and the transmitting power of AP is adjusted into identical with the transmitting power after described STA adjustment.
CPU is by fetch program or instruction, at definite AP to the signal strength values of STA after, utilize AP to STA transmitted power message recovery, described power message recovery is used to indicate and makes STA return to the transmitting power work before of the described power Indication message of reception.
CPU, by fetch program or instruction, sends multiple probe messages by AP to described STA for the transmitting power of utilizing the AP after adjustment; The multiple response messages that return for described multiple probe messages that obtain based on AP, obtain STA that described multiple response message the is corresponding mean value to multiple signal strength values of AP, arrive the signal strength values of AP using described mean value as STA.
CPU is by fetch program or instruction, for utilizing following formula to calculate the signal strength values of AP to STA:
RSSI A-S=P+M;
Wherein, RSSI a-Sfor AP is to the signal strength values of STA, P is the transmitting power before AP adjusts, and M is the difference of described STA to the signal strength values of AP and the current transmit power of described STA.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.

Claims (12)

1. a detection method for radio link quality, is characterized in that, comprising:
According to the transmitting power of the terminal STA obtaining, adjust the transmitting power between access point AP and STA, and utilize the transmitting power of the AP after adjusting to send probe messages by AP to described STA;
The response message that the described STA obtaining based on AP returns for described probe messages, obtains the signal strength values of STA to AP, and the current transmit power of STA;
Transmitting power before adjusting according to AP, and described STA is to the current transmit power of signal strength values and the STA of AP, determines the signal strength values of AP to STA.
2. the method for claim 1, is characterized in that, described according to the transmitting power of the terminal STA obtaining, and adjusts the transmitting power between access point AP and STA, specifically comprises:
According to the transmitting power of STA obtaining, when the transmitting power that judges described STA is less than or equal to the transmitting power of access point AP, the transmitting power that the transmitting power of adjusting AP is described STA.
3. the method for claim 1, is characterized in that, described according to the transmitting power of the terminal STA obtaining, and adjusts the transmitting power between access point AP and STA, specifically comprises:
According to the transmitting power of the terminal STA obtaining, when the transmitting power that judges described STA is greater than the transmitting power of access point AP, the transmitting power that maintains AP is constant, and transmission power indicative information is given described STA, indicate described STA to adjust transmitting power, using the transmitting power of described AP as maximum transmission power work;
Obtain the transmitting power after described STA adjusts, and the transmitting power of AP is adjusted into identical with the transmitting power after described STA adjustment.
4. method as claimed in claim 3, is characterized in that, described definite AP, after the signal strength values of STA, further comprises:
Utilize AP to STA transmitted power message recovery, described power message recovery is used to indicate and makes STA return to the transmitting power work before of the described power Indication message of reception.
5. the method for claim 1, is characterized in that, described method further comprises:
Utilize the transmitting power of the AP after adjusting to send multiple probe messages by AP to described STA;
The response message that the described described STA obtaining based on AP returns for described probe messages, obtains the signal strength values of STA to AP, specifically comprises:
The multiple response messages that return for described multiple probe messages that obtain based on AP, obtain STA that described multiple response message the is corresponding mean value to multiple signal strength values of AP, arrive the signal strength values of AP using described mean value as STA.
6. according to the arbitrary described method of claim 1-5, it is characterized in that, utilize following formula to calculate the signal strength values of AP to STA:
RSSI A-S=P+M;
Wherein, RSSI a-Sfor AP is to the signal strength values of STA, P is the transmitting power before AP adjusts, and M is the difference of described STA to the signal strength values of AP and the current transmit power of described STA.
7. a checkout gear for radio link quality, is characterized in that, comprising:
Adjustment unit, for according to the transmitting power of the terminal STA obtaining, adjusts the transmitting power between access point AP and STA, and utilizes the transmitting power of the AP after adjusting to send probe messages by AP to described STA;
Acquiring unit, the response message returning for described probe messages for the described STA obtaining based on AP, obtains the signal strength values of STA to AP, and the current transmit power of STA;
Determining unit, for the transmitting power before adjusting according to AP, and described STA is to the current transmit power of signal strength values and the STA of AP, determines the signal strength values of AP to STA.
8. device as claimed in claim 7, it is characterized in that, described adjustment unit, specifically for according to the transmitting power of STA obtaining, when the transmitting power that judges described STA is less than or equal to the transmitting power of access point AP, the transmitting power that the transmitting power of adjusting AP is described STA.
9. device as claimed in claim 7, it is characterized in that, described adjustment unit, specifically for according to the transmitting power of terminal STA obtaining, when the transmitting power that judges described STA is greater than the transmitting power of access point AP, the transmitting power that maintains AP is constant, and transmission power indicative information is given described STA, indicate described STA to adjust transmitting power, using the transmitting power of described AP as maximum transmission power work; And obtain the transmitting power after described STA adjusts, and the transmitting power of AP is adjusted into identical with the transmitting power after described STA adjustment.
10. device as claimed in claim 9, it is characterized in that, described device also comprises: recovery unit, be used at definite AP after the signal strength values of STA, utilize AP to STA transmitted power message recovery, described power message recovery is used to indicate and makes STA return to the transmitting power work before of the described power Indication message of reception.
11. devices as claimed in claim 7, is characterized in that, described adjustment unit sends multiple probe messages by AP to described STA specifically for the transmitting power of utilizing the AP after adjusting;
Described acquiring unit, specifically for the multiple response messages that return for described multiple probe messages that obtain based on AP, obtain STA that described multiple response message the is corresponding mean value to multiple signal strength values of AP, using described mean value as STA to the signal strength values of AP.
12. according to the arbitrary described device of claim 7-11, it is characterized in that, utilizes following formula to calculate the signal strength values of AP to STA:
RSSI A-S=P+M;
Wherein, RSSI a-Sfor AP is to the signal strength values of STA, P is the transmitting power before AP adjusts, and M is the difference of described STA to the signal strength values of AP and the current transmit power of described STA.
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