IW612 guard interval: What is the default setting?

[jun_1]

What is the default guard interval for IW612? Is it fixed value or a dynamically variable value? I tried to check the details using mlanutl, but could not find the corresponding command.

[jun_1]

Thank you for your reply.

[jun_1]

Let me give a supplementary explanation.

I'd like to know the default guard interval for 802.11n/802.11ac/802.11ax.

[weidong_sun]

Dear @jun_1 ,

See below, please!

-- For 802.11n/802.11ac, Guard Interval has 2 options:

(1) long GI : 800ns (0.8us) , it is also call 'normal' 

(2)short GI: 400ns (0.4us)

-- For 802.11 ax, Guard Interval has 3 options:

(1) long GI : 800ns (0.8us) , it is also call 'normal' 

(2)double: 1600ns (1.6us)

(3)quadruple: 3200ns (3.2us)

-- Using mlanutl to get or set Guard Interval

(1)Checking GI type

In README_MLAN document, you can see descriptions on if short GI or normal is enabled or disabled , no concrete time (period) of the GUI, because the correspond time has been fixed in 802.11 spec, like above. So you only need to check whether long GI or short GI, etc is enabled.

(2) For WiFi 6 setting

please refer to 'txratecfg'  session, definitions are like below:

For HE:
0 = 1xHELTF + GI0.8us
1 = 2xHELTF + GI0.8us
2 = 2xHELTF + GI1.6us
3 = 4xHELTF + GI0.8us if DCM = 1 and STBC = 1
4xHELTF + GI3.2us, otherwise.

So you can get default GI value when loading WiFi driver is done using mlanutl tool.

Thanks!

Regards,

weidong

[Christine_Li · Accepted solution]

Hi, @jun_1 

Thanks for creating case to us.

Let me check internally and feedback to you ASAP.

Best regards,

Christine.