1. QoS Poll Modifications Allowing Priority
Month 2000
doc.: IEEE /xxx
November, 2002
QoS Poll Modifications Allowing Priority
Author:
Matthew Sherman
AT&T Labs - Research
Date: November 12, 2002
Matthew Sherman, AT&T Labs
John Doe, His Company

2. November, 2002
Purpose
Define changes in the use of QoS Polls allowing the implementation of priority based scheduling disciplines
Matthew Sherman, AT&T Labs

3. November, 2002
The Problem
Existing draft does not permit priority based polling schemes
WSTA does not know polled priority
WSTA_1 may send lower priority traffic than WSTA_2
Strict priority not maintained
May drop higher priority traffic
Aggregate schedule forces all priorities to be grouped in single service period
Would like to support priority based scheduling
Matthew Sherman, AT&T Labs

4. Why support priorities
November, 2002
Why support priorities
802.1D only provides “priority”
Voice and Video likely arrive by 802.1D bridge
May only have “priority” available
Would like to support scheduling diciplines based on priority
Can be augmented by other parameters such as service time
Priority schedulers are very simple
Require proper admissions control
Matthew Sherman, AT&T Labs

5. Changes to draft Remove TXOP Limit field from Poll
November, 2002
Changes to draft
Remove TXOP Limit field from Poll
TXOP Limit fully duplicates information already available from Duration field
Subject of prior ballot comments (Why have both)
Made appropriate adjustments to text in draft
Makes room for new fields
Added two fields (5 bits)
Strict Priority (1 bit)
Polled TID (4 bits)
Added text describing usage
Schedule element no longer “aggregate”
Let WSTA do aggregation
Matthew Sherman, AT&T Labs

6. November, 2002
Notes on Aggregation
Doing schedule aggregation at WSTA rather than HC makes more sense
Less parameters for WSTA to track
Equivalent performance
Have single service period anyway
Either side can always renegotiate TSPEC
WSTA should always send most critical data first
No difference in performance if aggregation in HC or WSTA
Want disaggregated schedules to have same power save capabilities as aggregated
HC needs multiple TSPECs and schedules anyway
Gives station flexibility in choice of aggregation
Matthew Sherman, AT&T Labs

7. November, 2002
Proposed Motion
Instruct the TGe editor to incorporate the changes described in 02/706r0 into the TGe draft
Matthew Sherman, AT&T Labs