| The combination of sensor network and cooperative communication can combine sensor nodes,physical layer technology and wireless channel,and further optimize the research,so as to effectively improve the spectrum utilization and system performance of the whole wireless sensor network,and the difference of the traditional protocol design is need to understand the correlation between the layers in the system.In this paper,we mainly study the life cycle of cooperative MAC protocol based on relay selection and power allocation algorithm in wireless sensor networks with limited node energy.In the case of wireless sensor network,a relay selection and power allocation strategy based on decoding and forwarding is proposed to achieve the purpose of minimizing system transmission.To reduce energy consumption and improve network life,under the limit of maximum transmit power,average bit error rate and maximum channel SNR,the optimal power distribution is performed for the candidate relay nodes,and the relay selection is completed according to the transmission distance and the corresponding energy consumption.In the node energy-constrained wireless sensor network,the integrated rate factor and power factor are proposed based on multiple relay node optimized cooperative MAC protocol,the protocol based on the proposed relay selection algorithm,the first selected relay node to join the initial relay set.After obtaining the initial trunk set,the multi-relay optimization is carried out to obtain the optimal cooperation set.The simulation results show that the proposed cooperative MAC protocol based on multi-relay optimization effectively extend the network life cycle and reduce the node energy loss. |
