A Network Lifetime Extension-Aware Cooperative MAC Protocol for MANETs With Optimized Power Control

Abstract

In this paper, a cooperative medium access control (CMAC) protocol, termed network lifetime extension-aware CMAC (LEA-CMAC) for mobile ad-hoc networks (MANETs) is proposed. The main feature of the LEA-CMAC protocol is to enhance the network performance through the cooperative transmission to achieve a multi-objective target orientation. The unpredictable nature of wireless communication links results in the degradation of network performance in terms of throughput, end-to-end delay, energy efficiency, and network lifetime of MANETs. Through cooperative transmission, the network performance of MANETs can be improved, provided a beneficial cooperation is satisfied and design parameters are carefully selected at the MAC layer. To achieve a multi-objective target-oriented CMAC protocol, we formulated an optimization problem to extend the network lifetime of MANETs. The optimization solution led to the investigation of symmetric and asymmetric transmit power policies. We then proposed a distributed relay selection process to select the best retransmitting node among the qualified relays, with consideration on a transmit power, a sufficient residual energy after cooperation, and a high cooperative gain. The simulation results show that the LEA-CMAC protocol can achieve a multi-objective target orientation by exploiting an asymmetric transmit power policy to improve the network performance.

A Multi-Objective Target-Oriented Cooperative MAC Protocol for Wireless Ad-hoc Networks With Energy Harvesting

“…They are placed in the middle of the source and destination terminals. In a reactive relaying transmission system, data packets are [12], [29].…”

“…This happens when the harvested energy cannot be contained by the relay's battery buffer and/or the use of relay's own energy in an unjustified manner (energy theft) which is peculiar to cooperative relaying scheme [12]. Packet transmission for EH-CMAC protocol [12], [29].…”

“…The EH-CMAC protocol depicted in Figure 2 is similar to that in [12], [29]. It is an extension of the Legacy 802.11 MAC to ensure a better overall MAC layer stack performance of a network.…”

“…Based on this information, the proposed EH-CMAC protocol is designed to adapt to the requirement of instantaneous network performance. The proposed relay selection process is an extension of that in [29]. If traditional cooperation is desired, the helper nodes that satisfy this condition become the potential helper candidates.…”

“…The protocol showed a significant improvement in network lifetime and energy efficiency over CoopMAC. The work in [29], proposed a CMAC protocol with the ability to have network lifetime extension. Optimization, in this work was accomplished based on multi-objective targets.…”