Design And Implementation Of Data Classification Transmission System In Wireless Multimode Gateway

Wireless multimode gateway can be used in emergency communication and environment monitoring because of its various communication means and convenience in deployment.In addition,wireless multimode gateway can ensure the reliability of data transmission in areas lacking communication infrastructure by self-organizing network.In environmental monitoring system,the transmitted content may contain multiple types of data,such as audio,video and scalar data for environmental monitoring.Therefore,in wireless multimode gateway,an efficient transmission method is needed to deal with the problem of mixed data transmission.In this thesis,we propose a classification transmission method to cope with mixed data transmission problem.By studying the node classification method and the impact of node caching strategy on packet loss and retransmission,we design a wireless sensor network transmission protocol based on node classification.In this protocol,RNACK based mechanism is adopted to reduce the delay of packet retransmission.According to different functions of nodes,we design the packet processing algorithms of sender,receiver and intermediate node.In order to verify the feasibility of the protocol,we conduct simulation experiments with NS2 simulator.Results show that the new protocol can effectively reduce retransmission delay and improve transmission efficiency.According to the requirement and application scenario analysis of wireless multimode gateway,we design and implement an environmental monitoring system based on data classification transmission in multimode wireless gateway.In addition,we carny out experiments to verify our method.Results show that comparing with traditional transmission methods like PSFQ or RMST,our method has higher transmission efficiency,more stable performance,and better adaptability for mixed data transmission.