Opportunism Vs. Cooperation: Comparing Forwarding Strategies in Multihop Wireless Networks With Random Fading
A wide range of forwarding strategies have been developed for multi-hop wireless networks, considering the broadcast nature of the wireless medium and the presence of random fading that results in time-varying and unreliable transmission quality. Two recently proposed strategies are opportunistic forwarding, which exploits relay diversity by opportunistically selecting an overhearing relay as a forwarder, and cooperative forwarding, which relies on the synchronized transmissions of relays to reinforce received signal strengths. Although these strategies are well-known in the literature, they lack a thorough comparative analysis of their network-level performance in a realistic SINR (Signal-to-Interference-and-Noise Ratio) setting. In this paper, the authors develop Markov chain models for these protocols in the case of multiple competing flows in a general network setting.