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Performance Evaluation of Dynamic CCA-ED Threshold Control Scheme for WLAN
Minseok Oh(오민석),Hyeonho Na(나현호) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.12
An effort has been made to achieve and maintain a high data rate, which is actually experienced by the users and less affected by the nearby devices even in a Wi-Fi dense area. An IEEE 802.11ax TG (task group) was formed to standardize these efforts, so called HEW (high efficiency WLAN). As a way of alleviating the effect of nearby devices, the IEEE 802.11ax TG is considering a scheme which changes the CCA (clear channel assessment) threshold dynamically. In this paper we explain how the scheme tries to resolve the hidden terminal problem and the exposed terminal problem at the same time. We also analyze the performance of the dynamic CCA threshold control scheme in various density of APs/STAs through simulation.