1. Enhanced Channel Access Joint Proposal
Month 1998
doc.: IEEE /xxx
January 2001
Enhanced Channel Access Joint Proposal
Jin-Meng Ho TI
Khaled Turki TI
Sid Schrum TI
Wim Diepstraten Agere Systems
Menzo Wentink Intersil
Maarten Hoeben Intersil
Greg Chesson Atheros
Harold Teunissen Lucent Technologies
Wim Diepstraten, Agere Systems
John Doe, His Company

2. January 2001
P-DCF, V-DCF merger
This is a combined proposal of P-DCF and V-DCF mechanisms.
Into an ECA (Enhanced Channel Access) mechanism
preserving the main characteristics of the individual proposals
This primarily relates to the “contention access resolution” mechanisms
But we do assume that a Contention free bursting mechanism exists on top of this “contention Access Resolution” mechanism
Wim Diepstraten, Agere Systems

3. Elements of the joint proposal
January 2001
Elements of the joint proposal
Combined Enhanced Contention Channel Access Method.
The AP will distribute the differentiation parameters per TC using a TCPP value (use of CO to be investigated).
A “Contention Control Update” element can be send in a separate frame
Or in a Beacon.
Allowing stations to use a uniform or geometric distribution implementation.
For the TxOp event generation.
And use a separate scheduler algorithm selecting from which TC to transmit, based on the TCPP’s.
EAP will indicate in its contention control update whether the contending ESTAs shall adjust the CWs based on the latest broadcast TCPP values or on a retry backoff rule which is doubling the CW after the xth retry.
Wim Diepstraten, Agere Systems

4. References Ref 1: Doc 00/467r2 latest P-DCF proposal
January 2001
References
Ref 1: Doc 00/467r2 latest P-DCF proposal
Ref 2: Doc 00/399 latest V-DCF proposal
The new retry Backoff procedure for V-DCF is defined as:
Start exponential backoff by CW doubling after the first retry, on all Q’s, so per station.
In an AP CW doubling per Q is more effective.
Specific reference to the proposed schedule algorithm is given in ref 1 on slide 11.
Wim Diepstraten, Agere Systems