1. Recommended Principles for 802.11y
January 2006
doc.: IEEE /xxxxr0
March 2006
Recommended Principles for y
Date:
Authors:
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Steve Shellhammer, Qualcomm
Steve Shellhammer, Qualcomm

2. January 2006
doc.: IEEE /xxxxr0
March 2006
Abstract
This is a submission in response to the “Call for Purpose, Principle and Vision,” Peter Ecclesine, /0247r1, February 2006
This document includes several recommended Principles for y and a brief rationale for each principle
Steve Shellhammer, Qualcomm
Steve Shellhammer, Qualcomm

3. Usage Scenarios Principle Rationale
March 2006
Usage Scenarios
Principle
The y amendment should support the following two usage scenarios
Long range infrastructure mode
Long range mesh networking of mesh enabled Access Points
Rationale
There are many situations where longer range would be very useful
The higher power permitted in this band makes long range meshing of access points practical
It would be a missed opportunity if the higher power permitted in this frequency band was not utilized
Steve Shellhammer, Qualcomm

4. Leverage Work of 802.11n Principle Rationale
March 2006
Leverage Work of n
Principle
The y amendment should be derived from the draft n amendment
Rationale
The industry has spent several years developing a new PHY with MAC enhancements resulting in many significant improvements
A draft is currently available and can be adapted for use in the 3650 MHz band
Long range AP mesh networking application can benefit greatly from the improved rates at range enabled by MIMO
Steve Shellhammer, Qualcomm

5. Silicon Reuse Principle Rationale
March 2006
Silicon Reuse
Principle
The y amendment should target to reuse n silicon
Rationale
Silicon for n will be prevalent and development costs and deployment time can both be dramatically improved through silicon reuse
Longer GI and narrower bandwidths are both feasible through clock scaling of available silicon1
Clock scaling the n 40 MHz system down by four increases the GI to 3.2 s and results in a 10 MHz bandwidth
1 S. Shellhammer, S. Nanda and R. Walton, Range in y and Ramifications on OFDM Symbol Format, IEEE /0172r0, January 2006/
Steve Shellhammer, Qualcomm

6. Asymmetric Protection Problem
March 2006
Asymmetric Protection Problem
The transmit power permitted in this band is different for fixed and mobile devices
This potentially leads to different TX power for access points and client stations
Often in the MAC uses an RTS/CTS frame exchange to protect nearby stations
This protection mechanism is based on symmetric TX power and hence symmetric protection areas
If the TX power in y is asymmetric we may need to address this issue
Steve Shellhammer, Qualcomm

7. Asymmetric Protection Problem
March 2006
Asymmetric Protection Problem
High Power AP
Clears out too much
Area. Poor Frequency
Reuse
RTS Coverage Area AP
STA
CTS Coverage Area
Steve Shellhammer, Qualcomm

8. Asymmetric Protection Problem
March 2006
Asymmetric Protection Problem
RTS Coverage Area
Interference Area
Hidden
Node (AP) AP
STA
CTS Coverage Area
Steve Shellhammer, Qualcomm

9. Asymmetric Protection Problem
March 2006
Asymmetric Protection Problem
Principle
The y amendment should solve the asymmetric protection problem
Rationale
The use of RTS/CTS is an important protection mechanism and needs to be extended to work with asymmetric power
Steve Shellhammer, Qualcomm

10. No Harmful Interference to Primary Users
March 2006
No Harmful Interference to Primary Users
Principle:
The y amendment shall employ means to demonstrably prevent causing harmful interference to the primary users in the 3650 MHz band (FSS and Radiolocation Services)
Rationale:
Use of the band represents a new opportunity for users
The technology must share the band properly to enable this opportunity
Proposals and their supporting simulations should demonstrate the levels of interference incurred by primary users
Steve Shellhammer, Qualcomm

11. Support for Other 802.11 Amendments
March 2006
Support for Other Amendments
Principle
The y amendment should be compatible with the following amendments
802.11i
802.11r
802.11s
Rationale
The use cases for y rely on these amendments
Steve Shellhammer, Qualcomm

12. March 2006
Motion
Move that the principles in this document be adopted by TGy and be included in the Purpose, Principles and Vision document
Move: Steve Shellhammer
Second:
Vote
Yes No
Abstain
Steve Shellhammer, Qualcomm