1. Management Frame Channel Access Latency in TGh
March 2002
doc.: IEEE /xxx
March 2002
Management Frame Channel Access Latency in TGh
J. Del Prado, A. Soomro and S. Choi
[amjad.soomro, sunghyun.choi,
J. Del Prado, A. Soomro & S. Choi, Philips
J. Del Prado, A. Soomro & S. Choi, Philips

2. Introduction Current Management Frame Issues Proposed Changes
March 2002
Introduction
Current Management Frame
Issues
Latency
Proposed Changes
Conclusions
J. Del Prado, A. Soomro & S. Choi, Philips

3. The Current Management Frame
March 2002
The Current Management Frame
The current draft uses Action Frames
Before transmission need to contend for medium
No prioritized Access
J. Del Prado, A. Soomro & S. Choi, Philips

4. Issues Fast Channel access is important
March 2002
Issues
Fast Channel access is important
Regulatory reasons
To stop transmissions quickly
To announce channel switch swiftly
To perform measurements instantly
Latency is a issue Immediate  IMMEDIATE
DCF channel contention
Could be relatively long periods depending on network traffic
‘Immediately’ as good as channel access latency
J. Del Prado, A. Soomro & S. Choi, Philips

5. Proposed Changes Add the following text:
March 2002
Proposed Changes
Add the following text:
The AP is permitted to send Spectrum Management Action Frames, without performing backoff, after determining the WM to be idle for one PIFS period.
J. Del Prado, A. Soomro & S. Choi, Philips

6. March 2002
Example Usage
In DCF mode of operation, AP needs to announce channel switch information quickly
Access the channel after PIFS quiet period and send Spectrum Management Action Frame immediately
AP can send the frame multiple times, each separated by PIFS idle time, to increase the odds of its correct reception by STAs.
In DCF mode AP can send Measurement Frame to do measurements immediately and these can occur immediately.
J. Del Prado, A. Soomro & S. Choi, Philips

7. Conclusions Latency issue identified in the current draft.
March 2002
Conclusions
Latency issue identified in the current draft.
Important for regulatory reasons
A solution proposed
Simple solution
J. Del Prado, A. Soomro & S. Choi, Philips