Research On Selection Cooperation With Packet Aggregation For Wireless Sensor Networks

Wireless sensor networks,transmit data by means of wireless communication,are widely used in various fields of life.While the data reliability requirement during transmission is high,the multipath fading problem existing in wireless communication will affect the reliable transmission of data.Cooperative communication technology can effectively combat multipath fading and improve data transmission reliability by sharing a multi-user single antenna to form a virtual multi-input multi-output system,so a wireless sensor network can be effectively improved through the technology.Among which the selection cooperation has always been a research hotspot in the field of cooperation communication due to its high reliability and low complexity.It can obtain the same diversity performance as full relay cooperation with only a selected optimal node for cooperation communication.In some industrial wireless sensor networks,the sink node need to frequently obtain the data information collected by source node,and the data is often a packet with a small size.However,frequent communication between the source node and the sink node during data transmission may result in excessive interaction overhead,increased transmission delay,excessive energy consumption,and low spectrum utilization.Therefore,this thesis designs selection cooperation methods in multi-source multi-destination networks and multi-source single-destination network to combine packet aggregation and selection cooperation methods into wireless sensor network,and analyzes the transmission performance and energy consumption of the system.Main contributions as follows:1.The principles and key technologies of cooperative communication are researched,so as the relay forwarding mechanism and relay cooperation method.And the performance evaluation index of collaborative network is presented.2.A selection cooperation method based on packet aggregation in multi-source multi-destination cooperative network with low data packet between unequal source nodes and target nodes is proposed.Firstly,the multi-source multi-destination cooperative network is transformed into multiple multi-source single-destination cooperative networks by using the correlation matrix,which simplifies the network model.Meanwhile,a feedback-based distributed packet aggregation selection cooperation protocol is designed to improve the transmission.Besides,three time division multiple access scheduling methods are proposed to obtain the transmission order of source nodes.Finally,in order to improve data transmission reliability and balanced energy consumption,three optimal relay selection strategies based on channel quality,node residual energy,and relay election times are proposed.3.The thesis discusses the multiple packets aggregation selection strategy in multi-source single-destination cooperative network.In order to optimize system performance,the goal-oriented aggregation selection strategies is proposed.Firstly,the impact of the number of aggregated packets on network performance is investigated.In addition,a selection cooperation method supporting multiple packet aggregation is proposed in multi-source single-destination cooperative network.Subsequently,three target-oriented single-objective optimization selection strategies are proposed during aggregation transmission phase to optimize the performance of a certain aspect of the system according to the requirement.Finally,there may be multiple optimizations for single-objective optimization.Therefore,two multi-objective hierarchical optimization packet selection strategies are proposed to improve other performance of the system while ensuring the optimal performance of the single target of the network.