Research On MAC Cooperation Protocol For Wireless Ad-hoc Network System

In recent years,from the academic and industrial,wireless communication network in the concept of cooperation has aroused more concern,it can effectively solve the user mobility and network resources caused by the scarcity of wireless network performance degradation.In this paper,the wireless ad hoc network cooperation protocol was studied,the main contents are as follows:Firstly,in order to improve the opportunity to relay agreement,we proposed distributed on-demand cooperation agreement.In the absence of information on the network topology information,based on the measurement of the instantaneous channel state and the measured value,how to quickly select the optimal relay protocol node solution was proposed.In order to solve when to start cooperation,and how to quickly select the optimal relay problem,a distributed on-demand cooperation protocol is proposed.Through the analysis and simulation of the collision probability and throughput of the relay node,the distributed on-demand cooperation protocol reduces the collision probability selected by the relay node in the case of keeping the throughput unchanged.Secondly,based on Stackelberg game theory,a new interference perception relay selection scheme is proposed.The resources of the relay node are treated as wealth,and the relay node is priced through the channel condition.As the leader of the game,the source node chooses the available relay node based on the price and the gain,and the relay node serves as the follower of the game to the relevant source node.In order to reduce the MAI,the optimizing relay node becomes a cooperative node based on the competition.In the ad-hoc network,each node in the case of no CSI,that is,only single-hop channel state,we proposed a new distributed interference perception relay selection scheme,which ambient the multi-relay access in the conflict resource.Thirdly,under the condition of limited probability of interruption,a power allocation algorithm is proposed to minimize the total power of single relay OWRT system.From the perspective of network service quality,that is,in the case of limited probability of interruption,DF cooperative forwarding is used to give the total power minimization power allocation algorithm.And then take into account the actual cooperation may fail in the case,given the total power minimization of the power distribution algorithm.Lastly,from the physical layer and the MAC layer of the relationship between energy and throughput cross-layer analysis.The time and energy consumption of packet transmission,packet reception and MAC layer operation are analyzed.The results show that either the direct transmission scheme or the relay scheme can obtain the maximum throughput or the minimum energy consumption by optimizing the power of the transmitted signal.Through the study of the relationship between energy throughput,we can use the optimal transmit power to obtain the best energy efficiency or bandwidth efficiency in different scenarios.