멀티 채널 멀티 홉 무선 센서 네트워크의 Low Duty-cycle 상황하에서 데이터 보급방법

Abstract

Use of multiple frequency channels in a wireless sensor network alleviates bandwidth limitations in communication. Moreover, operating wireless sensor network with low duty-cycle conserves energy and thus prolongs network lifetime. With the benefits, these approaches bring challenges for data dissemination. In data dissemination each node tries to forward data to maximum neighbours in order to achieve maximum network coverage. It becomes difficult for each node to make forwarding decisions in a context where multiple channels are available with variable channels’ conditions and many of its neighbours are sleeping due to low duty-cycle. Hence, selection of the right channel is a critical issue for each node to disseminate data reliably and efficiently. In this paper, we present a distributed channel selection scheme for efficient data dissemination in low duty-cycle multi-channel multi-hop wireless sensor network and name it as a Smart Channel Selection Scheme. Proposed scheme allows sensor nodes to dynamically adapt their channel based on channels’ condition and number of active neighbours on each channel. Through simulations, we have analyzed the performance of our proposed approach and compared it with three relevant approaches i.e. Random Channel Selection, Channels' Condition based Channel Selection, and Neighbours based Channel Selection. Simulation results confirm that our approach outperforms the relevant approaches in terms of reliable and efficient data dissemination. With proposed Smart Channel Selection Scheme we can achieve near 75% packet delivery ratio under as low as 50% duty-cycle.