1. January 2001 Don Shaver, et.al. Texas InstrumentsSlide 1 doc.: IEEE 802.11-01/036 Submission 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. January 2001 Don Shaver, et.al. Texas InstrumentsSlide 2 doc.: IEEE 802.11-01/036 Submission 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. January 2001 Don Shaver, et.al. Texas InstrumentsSlide 3 doc.: IEEE 802.11-01/036 Submission 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 Introduction

4. January 2001 Don Shaver, et.al. Texas InstrumentsSlide 4 doc.: IEEE 802.11-01/036 Submission Contention-Based Access: Simulation Result Operation “recovered” from congestion as frames exceeding retry counts were discarded Smaller CWmin (higher priority) produced longer delays

5. January 2001 Don Shaver, et.al. Texas InstrumentsSlide 5 doc.: IEEE 802.11-01/036 Submission 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