Research On MAC Protocol With Cross-layer Design For Wireless Cooperative Networks

Cross-layer design is an important theoretical innovation for wireless cooperativecommunication. Different from the layered design,it views seperative network layers as a wholedesign.This dissertation studies on MAC protocol with cross-layer design in wireless cooperativecommunication,and focus on protocol design for the energy limitied wireless cooperativenetworkscenarios.In this paper, to extern the lifetime of the node energy limited wireless cooperative network,a node-utility-based with cross-layer cooperative MAC protocol is presented. Remain energy andchannel state information are considered to select a best relay in the data link layer. Then power isoptimally allocated to source and relay nodes with the objective of minimizing the totaltransmission power.The simulation results show that the node-utility-based MAC protocol can wellprolong the lifetime of the wireless cooperative network.Considering the data link layer signaling overhead to the impact of energy consumption, thispaper proposes a cooperative MAC protocol based on cross layer design.In this MAC protocol,AFand power allocation are considered in physical layer.Signaling overhead and three kinds ofcompetitive way (Intra-Competition,Inter-Competition,Conflict-Competition) are considered in datalink layer.With the combination of the physical layer and data link layer,this paper puts forward theconcept of link performance,with this concept the netwok chooses the best relay.The optimal relaynode occupies high data transfer rate and higher residual energy.Simulation results show that theproposed cross-layer cooperative MAC protocol can effectively prolong the network life cycle,and improve energy utilization.