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WIFI coverage configurati...

WIFI coverage configuration suggestion

Created: Dec 14, 2020 12:04:19Latest reply: Dec 15, 2020 14:51:36 540 6 0 0 0
  Rewarded HiCoins： 5 (problem resolved)
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customer has these below requiremnt about coverage, how can I set the parameters when I configure?

The following limits must not be violated: 

Min. signal strength, measured at client (RSSI):    -75 dB 

Min. Signal-/Noise Ratio, measured at client (SNR):    25 dB 

Max. transmit power at AP (included antenna gain)     25 dBm 

Max. 10 Access Points on same channel visible at the same time for client (-80 dB threshold)   

No other (Non-Wi-Fi  and rogue APs) radio sources within IEEE 802.11a/b/g/n frequency band 

 

Note: Max. transmit power limit must not be exceeded! We also highly recommend always to go with fixed transmit power levels in order to get reproducible results. 


WIFI coverageDesign

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chenhui
Admin Created Dec 15, 2020 06:23:59

Posted by Anderm at 2020-12-14 12:26 we already bought the AP, but and try to configure it. I think we should do some parameters to mat ...

Hi, 

The measurement value based on the detailed enviroment and the distance between the measuring device and the AP. While in your situation, you doesn't assgin the distance that you want to the set between the measuring device and the AP. For example, from the formula RSSI = Radio transmit power + TX antenna gain – Path loss – Signal attenuation caused by obstacles + RX antenna gain and 2.4 GHz: L = 46 + 25lg(d)[Indoor semi-open scenario], suppose the receiver is a mobile phone (the antenna gain is usually 0), signal attenuation caused by obstacles is 8dB we'll have an equation:

-75=25-(46+25lg(d))-8 

then we can get the coverage distance d is 69 meters.

If you want to lower down the transmit power at AP, the coverage distance will be small. In addition, more obstacles will cause the coverage distance small, too.

The SNR relatives to the noise power, which corresponds to the detailed implement enviroment. If you want to enlarge the SNR, you can set the transmit power up or cut the coverage distance down.


You are recommended to refer https://support.huawei.com/hedex/hdx.do?docid=EDOC1000088060&id=EN-US_TOPIC_0199760431&lang=en to design the WLAN network coverage.

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stephen.xu
stephen.xu Admin Created Dec 14, 2020 12:05:01

Hello, friend. Please kindly wait for a minute.
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Popeye_Wang
Popeye_Wang Admin Created Dec 14, 2020 12:16:48

Hi, Do you mean to find APs that meet the requirements?
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4#
Anderm
Anderm Created Dec 14, 2020 12:26:45

Posted by Popeye_Wang at 2020-12-14 12:16 Hi, Do you mean to find APs that meet the requirements?
we already bought the AP, but and try to configure it. I think we should do some parameters to match customer's requirement.
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5#
chenhui
chenhui Admin Created Dec 15, 2020 06:23:59

Posted by Anderm at 2020-12-14 12:26 we already bought the AP, but and try to configure it. I think we should do some parameters to mat ...

Hi, 

The measurement value based on the detailed enviroment and the distance between the measuring device and the AP. While in your situation, you doesn't assgin the distance that you want to the set between the measuring device and the AP. For example, from the formula RSSI = Radio transmit power + TX antenna gain – Path loss – Signal attenuation caused by obstacles + RX antenna gain and 2.4 GHz: L = 46 + 25lg(d)[Indoor semi-open scenario], suppose the receiver is a mobile phone (the antenna gain is usually 0), signal attenuation caused by obstacles is 8dB we'll have an equation:

-75=25-(46+25lg(d))-8 

then we can get the coverage distance d is 69 meters.

If you want to lower down the transmit power at AP, the coverage distance will be small. In addition, more obstacles will cause the coverage distance small, too.

The SNR relatives to the noise power, which corresponds to the detailed implement enviroment. If you want to enlarge the SNR, you can set the transmit power up or cut the coverage distance down.


You are recommended to refer https://support.huawei.com/hedex/hdx.do?docid=EDOC1000088060&id=EN-US_TOPIC_0199760431&lang=en to design the WLAN network coverage.

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Barret_Liu
Barret_Liu Created Dec 15, 2020 14:42:10

Posted by chenhui at 2020-12-15 06:23 Hi, The measurement value based on the detailed enviroment and the distance between the measuring ...
do I need to configure EIRP 25?
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chenhui
chenhui Admin Created Dec 15, 2020 14:51:36

Posted by Barret_Liu at 2020-12-15 14:42 do I need to configure EIRP 25?
Hi,
It depends.
As described previous, when setting it to 25dbm, the maximum coverage distance is about 69 meters. But you said the value must not exceed 25dbm, so, you should consider the live network environment to decide the detailed value. Maybe 25, or 20.
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