DTFMM:A Novel Multi-Channel MAC Protocol for Wireless Multimedia Sensor Networks
Wei Lu · Chuangan jishu xuebao · 2011
This paper presents an energy efficient,scalable and collision free MAC protocol-DTFMM(Distributed Time and Frequency Division Multi-Channel MAC),which combines frequency and time division principles for medium sharing.It employs a distributed local coordinate algorithm for arbitrating channels among clusters to enable simultaneous non-interfering data collection.Intra-cluster transmissions are scheduled by the cluster head(CH)based on time slot.CHs aggregate the gathered data and forward it over inter-CH paths to the base-station.Distinct channels are adopted by the independent branches of the inter-CH routing tree.Data transmission and reception on a branch is further scheduled in depth-first ordering.DTFMM allows nodes to stay in sleep mode for the longest duration and thus it minimizes energy consumption.Simulation experiments demonstrate the superiority of DTFMM in terms of throughput and delay performance when compared with well-known protocol MMSN.