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Donald P. Shaver, Jin-Meng Ho, Sid Schrum, Khaled Turki and Matthew B. Shoemake

Enhanced Contention Period Proposal for QoS and Throughput Enhancements - Objectives and Introduction. Donald P. Shaver, Jin-Meng Ho, Sid Schrum, Khaled Turki and Matthew B. Shoemake Texas Instruments Incorporated 12500 TI Blvd. Dallas, Texas 75243

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Donald P. Shaver, Jin-Meng Ho, Sid Schrum, Khaled Turki and Matthew B. Shoemake

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  1. Enhanced Contention Period Proposal for QoS and Throughput Enhancements -Objectives and Introduction Donald P. Shaver, Jin-Meng Ho, Sid Schrum, Khaled Turki and Matthew B. Shoemake Texas Instruments Incorporated 12500 TI Blvd. Dallas, Texas 75243 (214) 480-4349 (Shaver), (214) 480-1994 (Ho), (919) 463-1043 (Schrum), (214) 480-6908 (Turki) (214) 480-2344 (Shoemake) shaver@ti.com, jinmengho@ti.com, sschrum@ti.com, khaled@ti.com, shoemake@ti.com

  2. Objectives • Conform to the QoS Baseline Proposal [1] • Unambiguously define a robust, optimized hybrid access method for use in the contention period [2] • Specify a hybrid coordination function to facilitate the reduction in conformance levels [3], [4], [5] • Analyze, model, and simulate the proposed method to minimize risk and gain confidence in the proposed solution [6] • Compare benefits and advantages with respect to other leading EDCF proposals [3], [6], [7]

  3. Introduction • Texas Instruments Proposal • Introduces contention-free access mechanisms and contention-free transfer rules into the CP • Enhances contention access in the CP by adaptively adjusting permission probabilities with channel load changes (p-DCF) • Shows p-DCF may be implemented via probability or backoff • Unifies contention-free and contention access in the CP • Simulation Results • Demonstrates improved EDCF performance and robustness are achieved using p-DCF access mechanism

  4. Contention-Based Access:Simulation Result Smaller CWmin (higher priority) produced longer delays Operation “recovered” from congestion as frames exceeding retry counts were discarded

  5. References [1] QoS Baseline Proposal - revision 1, IEEE 802.11-00/360r1 [2] Hybrid Channel Access for DCF QoS and Throughput Enhancements, IEEE 802.11-00/468 [3] Contention-Free and Contention-Based Access in Contention Period, IEEE 802.11-00/467r1 [4] An Integrated 802.11 QoS Model with Point-Controlled Contention Arbitration, IEEE 802.11-00/448 [5] A Hybrid Coordination Function for QoS, IEEE 802.11-00/452 [6] Simulation Results for p-DCF, v-DCF and Legacy, IEEE 802.1-01/xxx [7] p-DCF Proposal Summary, IEEE 802.11-00/xxx

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