r0nttcca阈值定义讨论.pdf

Discussions on the Definition of CCA Threshold Date: 2015-01-09 Authors: Yusuke Asai Akira Yamada Slide 1 NTT, NTT O • A lot of discussions and evaluations about CCA level control (CCAC) / Dynamic Sensitivity Control (DSC) are presented in the TG ax. • However, the baseline of CCAC / DSC has not yet reached agreement. • Some topics should be determined to introduce CCAC / DSC into 802.11ax specification functions. – The definition of CCA threshold – Threshold types to be changed • We make a brief proposal of our CCAC / DSC design concept which aims to realize high efficiency WLAN. Slide 2 NTT, NTT O Contributions on CCAC / DSC in DensiFi • CCAC / DSC can improve system performance according to evaluations of these contributions. – However, there are some problems in order to apply CCAC / DSC adequa y. – Parameter settings and scenarios have a large impact on the performance of CCAC / DSC. Title Summary •Performance Gains from CCA Optimization •Simulation results for scenario 1-3 are shown. •CCA optimization provides 2x or greater gain in many scenarios both mean and 5% TPUT. •Dynamic CCA threshold selection still an open problem. m •Effect of CCA levels in Residential Scenario •Effect of changing CCA levels is evaluated. •Opt