CN103391142A - Method and device for determining RSSI value of channel, and access point equipment - Google Patents

Abstract

The invention discloses a method and a device for determining an RSSI (Received Signal Strength Indicator) value of a channel, and access point (AP) equipment. The method comprises the steps that A, an RSSI value in a received message is acquired, whether a current RSSI value of an AP is an initial value is determined, if so, Step D is executed, and if not, Step B is executed; B, an absolute value of a difference between the current RSSI value of the AP and the acquired RSSI value in the message is calculated, whether the absolute value is greater than a preset difference threshold value is determined, if so, Step D is executed, and if not, Step C is executed; C, the RSSI value of the AP is readjusted according to the current RSSI value of the AP, the acquired RSSI value in the message and a preset average value; and D, the acquired RSSI value in the message serves as the current RSSI value of the AP. With the adoption of the scheme, the RSSI value of the AP can be determined more precisely.

Description

A kind of definite method, device and access point apparatus of RSSI value of channel

Technical field

The present invention relates to communication technical field, espespecially definite method, device and the access point apparatus of a kind of received signal strength indicator of channel (Received Signal Strength Indication, RSSI) value.

Background technology

Along with the fast development of cordless communication network technology, and the rapid growth of business, the usable spectrum resource is fewer and feweri.And most of user and emerging wireless access technology often are partial to those limited and crowded frequency ranges, and this has just reduced the practical efficiency of usable spectrum resource.

In 802.11 agreements, an access point (Access Point, AP) forms a Basic Service Set (Basic Service Set, BSS) with a plurality of websites (Station, STA) of this AP of access.Along with the evolution of 802.11 agreements, channel expands to 40M, 80M, 120M etc. from original 20M, and these large bandwidth are to be formed by several 20M bindings, and for example, 40M is formed by two 20M bindings.If an AP is operated in the first channel, the bandwidth of work is 20M/40M, another one AP also is operated in the first channel, bandwidth of operation is 20M/40M/80M, the probability that bumps when with STA, adopting large bandwidth for transmission data of these two AP increases so, and then has reduced the efficiency of large wideband transmit.

In order to address the above problem, the generation of meeting the tendency of various channel adjusting methods, the most frequently used is dynamic channel allocation (Dynamic Channel Allocation, DCA) algorithm.Detailed process is: the noise of monitoring each available channel, for the channel of noise less than or equal to the first threshold value, continue the monitor interference value, and calculate the RSSI value of interference value less than or equal to the channel of the second threshold value, the channel that the RSSI value is minimum is as working channel.As seen, the factor that channel adjustment is played a decisive role is the RSSI value of channel, and the RSSI value of calculating at present channel adopts traditional arithmetic average algorithm usually, namely add up in trace interval, the RSSI value of carrying in message and the number of message, ask arithmetic mean to obtain the RSSI value of channel to the RSSI value of all messages.

Suppose, the RSSI value that three messages in first channel carry is respectively 1,6,11, and the RSSI value that the calculating arithmetic mean obtains first channel is (1+6+11)/3=6; The RSSI value that three messages in second channel carry is respectively 5,6,8, and calculating the RSSI value that arithmetic mean obtains second channel is (5+6+8)/3=6.3.Single the quality of first channel is better than second channel from result of calculation, but in fact second channel is more stable, and quality is better than first channel.Because the arithmetic average algorithm is in situation to equal probability of happening, just can come into force, can only roughly estimate by-level, and can not consider the fluctuation situation, therefore adopt the RSSI value of the channel that the arithmetic average algorithm obtains can not accurately reflect the quality of channel quality.

Summary of the invention

The embodiment of the present invention provides a kind of definite method, device and access point apparatus of RSSI value of channel, can not accurately reflect the problem of channel quality quality in order to the RSSI value that solves the channel that available technology adopting arithmetic average algorithm obtains.

Therefore,, according to one embodiment of the invention, provide a kind of definite method of RSSI value of channel, having comprised:

A, obtain the RSSI value in the message that receives, and whether the current RSSI value of definite access point AP be initial value, if carry out D; If not, carry out B;

The absolute value of the difference of the RSSI value in the current RSSI value of B, the described AP of calculating and the message that obtains, and whether determine described absolute value greater than the preset difference value threshold value, if, carry out D, otherwise, C carried out;

C, according to the RSSI value in the current RSSI value of described AP, the message that obtains with preset mean value and readjust the RSSI value of described AP;

RSSI value in D, the message that will obtain is as the current RSSI value of described AP.

Concrete, according to the RSSI value in the current RSSI value of described AP, the message that obtains with preset mean value and readjust the RSSI value of described AP, specifically comprise:

Readjust the RSSI value of described AP by following formula:

$\mathrm{ap}\_\mathrm{rssi}\left(1\right)=\frac{\mathrm{ap}\_\mathrm{rssi}\left(0\right)\×(\mathrm{rssi}\_\mathrm{avg}-1)+\mathrm{RSSI}}{\mathrm{rssi}\_\mathrm{avg}};$

Wherein, the RSSI value of the AP after ap_rssi (1) expression is readjusted, the current RSSI value of ap_rssi (0) expression AP, rssi_avg represents default mean value, RSSI represents the RSSI value in the message that obtains.

Better, determine that described absolute value, greater than after the preset difference value threshold value, also comprises:

F, whether determine current count value more than or equal to the preset times threshold value, if carry out D; Otherwise, carry out G;

G, described current count value is added 1.

The embodiment of the present invention also provides a kind of definite device of RSSI value of channel, comprises determining unit, computing unit, adjustment unit and replacement unit, wherein:

Described determining unit, be used for obtaining the RSSI value of the message that receives, and whether the current RSSI value of definite access point AP be initial value, if turn to described replacement unit; If not, turn to described computing unit;

Described computing unit, for the absolute value of the current RSSI value of calculating described AP with the difference of the RSSI value of the message that obtains, and determine that whether described absolute value is greater than the preset difference value threshold value, if turn to described replacement unit; Otherwise, turn to described adjustment unit;

Described adjustment unit, be used for the RSSI value of the current RSSI value according to described AP, the message that obtains and preset mean value and readjust the RSSI value of described AP;

Described replacement unit, be used for the current RSSI value of the RSSI value of the message that will obtain as described AP.

Concrete, described adjustment unit, be used for the RSSI value of the current RSSI value according to described AP, the message that obtains and preset mean value and readjust the RSSI value of described AP, specifically is used for:

Readjust the RSSI value of described AP by following formula:

$\mathrm{ap}\_\mathrm{rssi}\left(1\right)=\frac{\mathrm{ap}\_\mathrm{rssi}\left(0\right)\×(\mathrm{rssi}\_\mathrm{avg}-1)+\mathrm{RSSI}}{\mathrm{rssi}\_\mathrm{avg}};$

Wherein, the RSSI value of the AP after ap_rssi (1) expression is readjusted, the current RSSI value of ap_rssi (0) expression AP, rssi_avg represents default mean value, RSSI represents the RSSI value in the message that obtains.

Better, also comprise judging unit and counting unit, wherein:

Described judging unit, be used for whether determining current count value more than or equal to the preset times threshold value, if turn to described replacement unit after described computing unit determines that described absolute value is greater than the preset difference value threshold value; Otherwise, turn to described counting unit;

Described counting unit, be used for described current count value is added 1.

The embodiment of the present invention also provides a kind of access point apparatus, comprises definite device of the RSSI value of above-mentioned channel.

This scheme can be according to the absolute value of the difference of the RSSI value of the RSSI value in the current message that receives and a upper message that receives, determine the RSSI value of AP, if absolute value is greater than the preset difference value threshold value, with the current RSSI value of the RSSI value in the message that obtains as AP; If absolute value is less than or equal to the preset difference value threshold value, according to the RSSI value in the current RSSI value of AP, the message that obtains with preset mean value and readjust the RSSI value of AP, RSSI value fluctuation can take into account message when determining the RSSI value of AP in, with respect to only adopting the arithmetic average algorithm can determine more exactly the RSSI value of AP in prior art, and then the AP that can choose exactly better quality carries out transfer of data.

Description of drawings

Fig. 1 is the flow chart of definite method of the RSSI value of channel in the embodiment of the present invention;

Fig. 2 is the structural representation of definite device of the RSSI value of channel in the embodiment of the present invention;

Fig. 3 is the structural representation of definite device of the RSSI value of preferred channel in the embodiment of the present invention.

Embodiment

The RSSI value of the channel that obtains for available technology adopting arithmetic average algorithm can not accurately reflect the problem of channel quality quality, the embodiment of the present invention provides a kind of definite method of RSSI value of channel, the flow process of the method as shown in Figure 1, setting in the scan period,, for each channel to be adjusted, carry out:

S10: flow process starts.

At first set four parameters, the RSSI of AP adopts parameter ap_rssi to represent; Current count value adopts parameters rs si_gap_cnt to represent; The preset difference value threshold value adopts parameters rs si_gap_max to represent; Default mean value adopts parameters rs si_avg to represent.The initial value of ap_rssi can be made as numerical value or character, and for example-1 ,-2,0, a, b etc., rssi_gap_max and rssi_avg can set according to actual needs, and perhaps statistics is determined.Scan period can be set according to actual needs, can be set as 100ms, 150ms etc. numerical value.

S11: obtain the RSSI value in the message that receives, and whether the current RSSI value of definite AP be initial value, if not, carry out S12; If carry out S16.

S12: the absolute value of the difference of the RSSI value in the current RSSI value of calculating AP and the message that obtains, and whether definite absolute value is greater than the preset difference value threshold value, if carry out S14; Otherwise, carry out S13.

S13: according to the RSSI value in the current RSSI value of AP, the message that obtains with preset mean value and readjust the RSSI value of AP, carry out S17.

S14: whether determine current count value more than or equal to the preset times threshold value, if carry out S16; Otherwise, carry out S15.

S15: current count value is added 1, carry out S17.

S16: the RSSI value in the message that will obtain, as the current RSSI value of AP, is carried out S17.

Can to previous message in the absolute value of difference of the RSSI value message number that all surpasses the preset difference value threshold value count, if current count value does not surpass the preset times threshold value, illustrate that it is not very large disturbing, can not change the current RSSI value of AP, if current count value is more than or equal to the preset times threshold value, illustrate that interference is very large, with the RSSI value of the RSSI value in last message as AP.So just can get rid of the larger situation of RSSI value fluctuation ratio in message, thereby can accurately determine the RSSI value of AP.

The preset times threshold value can be set according to actual needs, can be set as 3,4,5 etc. numerical value.

S17: whether the monitoring setting scan period expires, and, if not yet due, carries out S18; , if expire, carry out S19.

S18: obtain next message, carry out S11.

S19: with the current count value zero clearing, flow process finishes.

This scheme can be according to the absolute value of the difference of the RSSI value of the RSSI value in the current message that receives and a upper message that receives, determine the RSSI value of AP, if absolute value is greater than the preset difference value threshold value, with the current RSSI value of the RSSI value in the message that obtains as AP; If absolute value is less than or equal to the preset difference value threshold value, according to the RSSI value in the current RSSI value of AP, the message that obtains with preset mean value and readjust the RSSI value of AP, RSSI value fluctuation can take into account message when determining the RSSI value of AP in, with respect to only adopting the arithmetic average algorithm can determine more exactly the RSSI value of AP in prior art, and then the AP that can choose exactly better quality carries out transfer of data.

Concrete, the RSSI value in the current RSSI value according to AP in above-mentioned S13, the message that obtains and preset mean value and readjust the RSSI value of AP specifically comprises:

Readjust the RSSI value of AP by following formula:

$\mathrm{ap}\_\mathrm{rssi}\left(1\right)=\frac{\mathrm{ap}\_\mathrm{rssi}\left(0\right)\×(\mathrm{rssi}\_\mathrm{avg}-1)+\mathrm{RSSI}}{\mathrm{rssi}\_\mathrm{avg}};$

Wherein, the RSSI value of the AP after ap_rssi (1) expression is readjusted, the current RSSI value of ap_rssi (0) expression AP, rssi_avg represents default mean value, RSSI represents the RSSI value in the message that obtains.

Based on same inventive concept, the embodiment of the present invention provides a kind of definite device of RSSI value of channel, and this device can be arranged in access point apparatus, and structure as shown in Figure 2, comprise determining unit 20, computing unit 21, adjustment unit 22 and replacement unit 23, wherein:

Determining unit 20, be used for obtaining the RSSI value of the message that receives, and whether the current RSSI value of definite AP be initial value, if turn to replacement unit 23; Otherwise, turn to computing unit 21.

Computing unit 21, for the absolute value of the current RSSI value of calculating AP with the difference of the RSSI value of the message that obtains, and whether definite absolute value is greater than the preset difference value threshold value, if turn to replacement unit 23; Otherwise, turn to adjustment unit 22.

Adjustment unit 22, be used for the RSSI value of the current RSSI value according to AP, the message that obtains and preset mean value and readjust the RSSI value of AP.

Replacement unit 23, be used for the current RSSI value of the RSSI value of the message that will obtain as AP.

Concrete, above-mentioned adjustment unit, be used for the RSSI value of the current RSSI value according to AP, the message that obtains and preset mean value and readjust the RSSI value of AP, specifically is used for:

Readjust the RSSI value of AP by following formula:

$\mathrm{ap}\_\mathrm{rssi}\left(1\right)=\frac{\mathrm{ap}\_\mathrm{rssi}\left(0\right)\×(\mathrm{rssi}\_\mathrm{avg}-1)+\mathrm{RSSI}}{\mathrm{rssi}\_\mathrm{avg}};$

Wherein, the RSSI value of the AP after ap_rssi (1) expression is readjusted, the current RSSI value of ap_rssi (0) expression AP, rssi_avg represents default mean value, RSSI represents the RSSI value in the message that obtains.

Better, a kind of definite device of RSSI value of channel as shown in Figure 3, on the basis of Fig. 2, also comprises judging unit 24 and counting unit 25, wherein:

Judging unit 24, be used for whether determining current count value more than or equal to the preset times threshold value, if turn to replacement unit 23 after computing unit 21 determines that absolute value is greater than the preset difference value threshold value; Otherwise, turn to counting unit 25.

Counting unit 25, be used for current count value is added 1.

Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.

Claims (7)

1. definite method of the received signal strength indicator RSSI value of a channel, is characterized in that, comprising:

A, obtain the RSSI value in the message that receives, and whether the current RSSI value of definite access point AP be initial value, if carry out D; Otherwise, carry out B;

The absolute value of the difference of the RSSI value in the current RSSI value of B, the described AP of calculating and the message that obtains, and whether determine described absolute value greater than the preset difference value threshold value, if, carry out D, otherwise, C carried out;

C, according to the RSSI value in the current RSSI value of described AP, the message that obtains with preset mean value and readjust the RSSI value of described AP;

RSSI value in D, the message that will obtain is as the current RSSI value of described AP.

2. the method for claim 1, is characterized in that, according to the RSSI value in the current RSSI value of described AP, the message that obtains with preset mean value and readjust the RSSI value of described AP, specifically comprises:

Readjust the RSSI value of described AP by following formula:

$\mathrm{ap}\_\mathrm{rssi}\left(1\right)=\frac{\mathrm{ap}\_\mathrm{rssi}\left(0\right)\×(\mathrm{rssi}\_\mathrm{avg}-1)+\mathrm{RSSI}}{\mathrm{rssi}\_\mathrm{avg}};$

Wherein, the RSSI value of the AP after ap_rssi (1) expression is readjusted, the current RSSI value of ap_rssi (0) expression AP, rssi_avg represents default mean value, RSSI represents the RSSI value in the message that obtains.

3. method as claimed in claim 1 or 2, is characterized in that, determines that described absolute value, greater than after the preset difference value threshold value, also comprises:

F, whether determine current count value more than or equal to the preset times threshold value, if carry out D; Otherwise, carry out G;

G, described current count value is added 1.

4. definite device of the received signal strength indicator RSSI value of a channel, is characterized in that, comprises determining unit, computing unit, adjustment unit and replacement unit, wherein:

Described determining unit, be used for obtaining the RSSI value of the message that receives, and whether the current RSSI value of definite access point AP be initial value, if turn to described replacement unit; Otherwise, turn to described computing unit;

Described computing unit, for the absolute value of the current RSSI value of calculating described AP with the difference of the RSSI value of the message that obtains, and determine that whether described absolute value is greater than the preset difference value threshold value, if turn to described replacement unit; Otherwise, turn to described adjustment unit;

Described adjustment unit, be used for the RSSI value of the current RSSI value according to described AP, the message that obtains and preset mean value and readjust the RSSI value of described AP;

Described replacement unit, be used for the current RSSI value of the RSSI value of the message that will obtain as described AP.

5. device as claimed in claim 4, is characterized in that, described adjustment unit is used for the RSSI value of the current RSSI value according to described AP, the message that obtains and presets mean value and readjust the RSSI value of described AP, specifically is used for:

Readjust the RSSI value of described AP by following formula:

$\mathrm{ap}\_\mathrm{rssi}\left(1\right)=\frac{\mathrm{ap}\_\mathrm{rssi}\left(0\right)\×(\mathrm{rssi}\_\mathrm{avg}-1)+\mathrm{RSSI}}{\mathrm{rssi}\_\mathrm{avg}};$

Wherein, the RSSI value of the AP after ap_rssi (1) expression is readjusted, the current RSSI value of ap_rssi (0) expression AP, rssi_avg represents default mean value, RSSI represents the RSSI value in the message that obtains.

6. device as described in claim 4 or 5, is characterized in that, also comprises judging unit and counting unit, wherein:

Described judging unit, be used for whether determining current count value more than or equal to the preset times threshold value, if turn to described replacement unit after described computing unit determines that described absolute value is greater than the preset difference value threshold value; Otherwise, turn to described counting unit;

Described counting unit, be used for described current count value is added 1.

7. an access point apparatus, is characterized in that, comprises the definite device as the received signal strength indicator RSSI value of the arbitrary described channel of claim 4-6.

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