October 2008 doc.: IEEE 802.11-08/1241r1

IEEE P802.11
Wireless LANs

Coex October Conference Call Minutes
Date: 2008-10-29
Author(s):
Name / Company / Address / Phone / email
Eldad Perahia / Intel Corporation / 2111 NE 25th Ave
Hillsboro, OR 97124 / 503-712-8081 /

1  Conference Call Times

Date / Start Time / End Time
October 22 / 11 AM Eastern Time / 1 PM Eastern Time
October 29 / 11 AM Eastern Time / 1 PM Eastern Time

2  Attendance

Participant / Oct 22 / Oct 29
Dave Bagby (Calypso) / x / x
John Barr (Motorola) / x
Doug Chan (Cisco) / x / x
Vinko Erceg (Broadcom) / x / x
Padam Kafle (Nokia) / x
Kiran (Ralin) / x / x
Bruce Kraemer (Marvell) / x / x
Peter Loc (Ralink) / x / x
Eldad Perahia (Intel) / x / x
Adrian Stephens / x

3  Minutes from October 22, 2008 Conference Call

3.1  Agenda

·  Coex part of call began at 12 noon ET

·  Check to see if anyone is not familiar with the IEEE patent policy http://standards.ieee.org/board/pat/pat-slideset.pdf

·  Submission by Peter Loc & Kiran

o  https://mentor.ieee.org/802.11/file/08/11-08-1238-02-000n-optional-non-802-11-radio-scans-proposal.ppt

o 

3.2  Patent Policy

Noone was unfamiliar with the IEEE patent policy. No essential patents announced

3.3  Discussion on 08/1238r2

•  CID 10025

•  Adrian: Where do you define what a non-802.11 scan is?

–  Peter: need to add that.

•  Dave: what is IDO?

–  Peter: IBSS STA

–  Bruce: IDO only applies to 5GHz

•  Doug: are you tracking 802.19? when is the appropriate time to put something like this in?

•  Adrian: what is continuous RX/TX?

–  Kirin: normal channel access, with saturated traffic

•  Adrian : It appears that 40MHz provides better performance, why switch

•  Kiran & Peter: if 20MHz BSS is detected, need to switch. Degradation occurs on switch

•  Padam: what was BW of BT? How long was switch time?

–  5-10s switch time

•  Harish: if switch is made in 1s, will see impact?

•  Dave: opposed to changes to draft

–  Analysis is tech interesting, but not relevant.

–  In ISM, devices need to accept interference

–  Political agreement in Hawaii to add compromise informative text

–  Deal was not good, since issue is still coming up again

–  Text is specific to BT, unrealistic to specify scanning for types of devices

•  Peter: will interfere with emergency voice call

–  Bruce: these are not BT SCO measurements, so do not apply to BT voice

•  John Barr: coexistence mechanism in 802.15.2 was designed for smaller amount of spectrum than 40MHz. 11n should not use so much spectrum

•  Vinko: on slide 9, would the same behaviour occur with low duty cycle dot11 traffic?

–  Kiran: maybe, would need to make measurements

•  Vinko: old BT device, new BT devices would be have AFH engineered to 40MHz

•  Adrian: we are seeing in the graph the response of a specific AFH algorithm

•  Eldad: is it true that this is not BT SCO?

–  Bruce: stereo headset is A2DP

4  Minutes from October 29, 2008 Conference Call

4.1  Agenda

·  Coex part of call began at 12 noon ET

·  Check to see if anyone is not familiar with the IEEE patent policy http://standards.ieee.org/board/pat/pat-slideset.pdf

·  Submission by Peter Loc & Kiran

o  https://mentor.ieee.org/802.11/file/08/11-08-1238-02-000n-optional-non-802-11-radio-scans-proposal.ppt

o 

4.2  Patent Policy

Noone was unfamiliar with the IEEE patent policy. No essential patents announced

4.3  Continue discussion on 08/1238r2

·  Start discussion with slide 9

·  Vinko: would you conclude that similar BW occupied by 40MHz 11n as BT, in other words fair sharing of spectrum?

·  Peter: change slide 15 to counter

o  Have not defined non-802 scanning

o  Need to fix IDO STA reference

·  Peter: should we do SCO test?

o  Bruce: we have seen previous SCO results, was immune to interference. Past ACL results was vulnerable. Can not make voice conclusions based on ACL measurements.

·  Dave: the real problem is that the band is used up in ISM, devices will have a problem. Doesn’t matter what the interference is. Invalid assumption is that if 11n doesn’t do 40MHz, that there will extra spectrum. There are many different type of uses. What is the return on investement of adding scanning to 11n.

o  Peter: we have concerns with the switch between 20MHz to 40 MHz. Relatively easy for 11n to scan for energy.

· 

Submission page 3 Eldad Perahia, Intel