A Power Control MAC Protocol to Increase Spatial Reuse of WLANs

• Main Authors: Chien-Min Chou, 周建閔
• Other Authors: Kuei-Ping Shih
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/00736232504287758364

碩士 === 淡江大學 === 資訊工程學系 === 92 === Currently, wireless local area networks (WLAN) are applied to Internet accesses in numerous circumstances such as campuses, hotels, airports, etc. However, scarce resources (e.g., limited bandwidth and battery power) significantly restrict the applications of WLANs. Besides, the network with higher traffic loads and more stations is most likely incurs collisions, and further consumes bandwidth and energy. In this paper, a distributed protocol, Power-Efficient MAC Protocol (PEM), to avoid collisions and to save energy is proposed. PEM takes advantage of a power control technique which dynamically adjusts transmission power levels for different transmission pairs to reduce the interferences among transmission pairs. Based on the concept of Maximum Independent Set (MIS), a novel heuristic scheme with the aid of interference information is proposed in PEM to provide as many simultaneous transmission pairs as possible. To verify the performance of PEM, a lot of simulations are performed in the paper. The experimental results show that with the property of spatial reuse, PEM not only reduces power consumption, but also leads to higher network throughput in comparison with three different approaches, DCF, DCS, and DPSM.