1. Extension Coexistence with OBSS
Month Year
doc.: IEEE yy/0857r0
June 2006
Extension Coexistence with OBSS
Date:
Authors:
Name
Company
Address
Phone
Assaf Kasher
Intel
Solomon Trainin
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Assaf Kasher (Intel)
Assaf Kasher (Intel)

2. CID numbers Partially addressing these comments:
Month Year
doc.: IEEE yy/0857r0
June 2006
CID numbers
Partially addressing these comments:
1430, 2730, 49, , 2723, 4640, 6813, 6938, 7178, 7319, 7767, 7839, 7893, 10016, 106, 291, 1517, 1503, 1559, 1625, 1635, 165, 3882, 4084, 4188, 4574, 6769, 7012, 7473, 7922, 10293, 10379, , 12111, 12245, 11730, 1405, 3513, 3414, 10018
Assaf Kasher (Intel)
Assaf Kasher (Intel)

3. How does a 40MHz device respect transmission in the extension channel
Month Year
doc.: IEEE yy/0857r0
June 2006
How does a 40MHz device respect transmission in the extension channel
It is impossible to respect the NAV in the extension channel
We cannot receive in the extension channel while we are transmitting in the control channel.
We need to set a mechanism that will enable reasonable coexistence between a 40MHz BSS and an overlapping BSS in the extension channel.
Assaf Kasher (Intel)
Assaf Kasher (Intel)

4. Month Year
doc.: IEEE yy/0857r0
June 2006
Proposal
The PHY senses CCA on both the control and extension channel. (CCA on the extension channel is energy based)
The 40MHz will fully respect NAV on the control channel.
When the backoff counter of a 40MHz device expires, when there is no transmission in the control channel (CCA(idle)), it will check CCA in the extension channel. If there is a CCA(busy) signal in extension channel, it shall not transmit a 40MHz transmission.
At this point:
It may choose to transmit in 20MHz.
If it chooses to transmit in 40MHz, it must wait for CCA to go to idle in the extension channel, and then restart the backoff counter in the control channel.
Assaf Kasher (Intel)
Assaf Kasher (Intel)