Abstract
The S-MAC protocol is a very classic competition-based MAC protocol [1]. Many MAC protocols proposed are modified on the basis of S-MAC protocol. However, most of the current improvements to traffic adaptation are for one or both of backoff mechanism [2], duty cycle mechanism [3] and power control mechanism [4]. The modified MAC protocols still have problems of single control factor. Therefore, this paper proposes a modified traffic self-adaptive MAC protocol called TSA-MAC1. In terms of backoff mechanism, a multi-factor cross-control backoff mechanism is proposed in this paper. Considering the duty cycle mechanism, the average flow factor is introduced for measuring network traffic, and the current value of duty cycle will vary around the initial duty cycle according to the range of that factor. Considering the power control mechanism, the formula of Friis is used to calculate the minimum transmission power. And an exponential function is chosen to multiply the minimum transmission power. Simulation results show that the proposed MAC protocol has significant advantages on energy consumption, throughput and transmission delay.
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