Economy

Abstract

This paper proposes ECONOMY, an Opportunistic Routing (OR) protocol that is free from duplicate transmission. OR utilizes overheard packets and takes multiple routes into consideration concurrently. It has been shown that OR outperforms traditional routing by close to 100% in term of throughput; however, duplicate transmissions may occur as relays cannot hear one another, and it consequently degrades the performance of OR. ECONOMY uses token passing along a path that relays can hear one another to eliminate duplicate transmission. When a token arrives, the relay is allowed to transmit unacknowledged packets according to the acknowledgement information within the received token. Therefore, ECONOMY can prevent duplicate transmission while keeping the advantages of OR. Simulation results show that while previous OR schemes suffer from duplicate transmission, ECONOMY can exploit the potential of OR and perform up to 100% better than traditional routing.