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논문 기본 정보

저자정보
(Kwangwoon University)
저널정보
한국정보통신학회 한국정보통신학회논문지 한국정보통신학회논문지 제30권 제10호
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    초록·키워드

    IEEE 802.11 DCF, based on CSMA/CA with random backoff, performs well with few stations (STAs) but suffers rapidly rising collision probability and degraded performance as contention increases. This paper proposes a hybrid MAC scheme that adaptively switches modes according to congestion. When the number of active STAs n is at or below a threshold N<sub>th</sub>, the original DCF is used; when n exceeds N<sub>th</sub>, the Access Point piggybacks the next STA’s identifier onto the ACK frame, switching to collision-free sequential polling. Extending Bianchi[1]’s methodology, this study models the DCF mode via a Markov chain and the polling mode via a renewal-reward process, deriving the saturation throughput and the optimal N<sub>th</sub>. The analysis shows the proposed scheme significantly improves throughput over conventional DCF by reducing collisions in dense environments.

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