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Enhanced Channel Access Joint Proposal for Enhanced Contention Mechanisms

Combined proposal of P-DCF and V-DCF mechanisms into Enhanced Channel Access mechanism, preserving key features. Includes proposed Content Access Resolution and Contention Control Update elements to improve channel efficiency.

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Enhanced Channel Access Joint Proposal for Enhanced Contention Mechanisms

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  1. Enhanced Channel AccessJoint 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

  2. 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 • 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 • 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

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