Energy – Effectual Strategies for Conjunctive Multichannel MAC Protocols

Abstract: This paper presents the energy efficient strategies and the importance of Altruistic approach in the absence of nearest neighboring nodes to the receiver. Two energy-efficient strategies are proposed: in-situ energy conscious DISH, which uses existing nodes only, and altruistic DISH, which requires additional nodes called altruists. Generally comparison is done with five protocols with respect to these strategies and identifies altruistic DISH to be the right choice in general: it 1) conserves 40-80 percent of energy, 2) maintains the throughput advantage, and 3) more than doubles the cost efficiency compared to protocols without this strategy. On the other hand, our study also shows that in-situ energy conscious DISH is suitable only in certain limited scenarios. a new notion of cooperation was proposed to solve multi-channel coordination problems. When a transmit- receive pair wishes to initiate communication, neighboring nodes share their knowledge of channel usage. This helps to substantially reduce collisions and increases throughput significantly. However, it comes at the cost of increased energy consumption since idle nodes have to stay awake to overhear and acquire channel usage information. In fact this can be as high as 264% of a power-saving protocol without cooperation. The core idea is to introduce specialized nodes called altruists in the network whose only role is to acquire and share channel usage information. All other nodes, termed peers, go in to the sleep mode when idle. This strategy seems naïve because it needs additional nodes to be deployed.

Keywords: Cooperation, Energy Efficiency, MAC Protocol, Multi-Channel, in-situ energy conscious DISH, wireless ad hoc networks