1. Solution for 40MHz in 2.4 GHz band
Month Year
doc.: IEEE yy/0XXXr0
June 2006
Solution for 40MHz in 2.4 GHz band
Date:
Authors:
Name
Company
Address
Phone
Assaf Kasher
Intel
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Assaf Kasher et al. (Intel)
Assaf Kasher (Intel)

2. Addresses Comments with CIDs
Month Year
doc.: IEEE yy/0XXXr0
June 2006
Addresses Comments with CIDs
104, 258, 286, 288, 430, 431, 689, 705, 706, , 1493, 1558, 1560, 1561, 1728, 2848, 3471, 3501, 3502, 3602, 4570, 4571, 7010, 7193, 7195, 7312, 7313, 7314, 7315, 7871, 7925, 8138, 8186, 8194, 8282, 10272
Assaf Kasher et al. (Intel)
Assaf Kasher (Intel)

3. The Concept See Document 1699r1 for details
Month Year
doc.: IEEE yy/0XXXr0
June 2006
The Concept
Allow 40MHz operations in 2.4GHz only when there is no substantial load in or near the extension channel. Otherwise: mandate BSS transition to 20 MHz
“In” the extension channel means devices 20MHz off the control channel
“Near” the extension channel means devices 20/25/30MHz off the control channel
See Document 1699r1 for details
Assaf Kasher et al. (Intel)
Assaf Kasher (Intel)

4. Switching from 40 to 20 A 40MHz STA/AP shall switch to 20MHz operation
June 2006
Switching from 40 to 20
A 40MHz STA/AP shall switch to 20MHz operation
When the signal in the extension channel passes the detection threshold for N% duty cycle (time) for the preceding M seconds.
M and N are values selected by the AP and specifed in the HT information element.
Each of these values has one of 8 possible values:
2%-16% for N
1s-18s for M.
Assaf Kasher et al. (Intel)

5. Announcing the Switch STA Tranisition: AP Transition
Month Year
doc.: IEEE yy/0XXXr0
June 2006
Announcing the Switch
STA Tranisition:
Change to Notify Channel Width frame:
Add a value of 2 specifying that the STA can no longer receive 40MHz frames
AP Transition
Use the extended Channel Switch announcement.
Assaf Kasher et al. (Intel)
Assaf Kasher (Intel)

6. Month Year
doc.: IEEE yy/0XXXr0
June 2006
Switching Back to 40MHz
An AP/STA can switch back to 40MHz L seconds after it has switched to 20MHz.
L is selected by the AP.
5s-640s
After switching back to 40MHz, it shall not transmit at 40 for at least M seconds.
Assaf Kasher et al. (Intel)
Assaf Kasher (Intel)