Research On Routing Algorithms In Wearable Wireless Sensor Network

In recent years,man-made and natural disasters have been increasing in worldwide.During the disaster,disaster relief personnel and rescue teams may face various uncertainties and dangers.These unfavorable factors not only affect the rescue operations of disaster relief personnel,but also may endanger their life and health.Therefore,in such emergencies,a disaster response network which is stable,efficient and easy to deploy becomes very important.Wearable Wireless Sensor Network(WWSN)can meet these requirements.The network is a self-organizing network based on the human body.WWSN can not only be composed quickly,but also collect human physiological indicators and surrounding environment information in real time and transmit them to the command center.Due to the special nature of disaster relief,data aggregation and transmission in this environment should be real-time,accurate and efficient.Therefore,for WWSN in disaster rescue environments,the routing algorithms used for On-Body network and Body-to-Body network(B2B)are critical.This thesis fully considers the particularity of the routing algorithm under the disaster relief scenario.For the On-Body network,we propose the Energy Consumption Balanced Topology Variable Routing Algorithm(ECB-TV).In the normal state of the network,the multi-hop routing is designed based on the premise of energy balance to extend the network lifetime.When the network is abnormal,single-hop routing is adopted to ensure that abnormal data can be sent out with the lowest delay.Thereby effectively protecting the lives of disaster relief personnel.For the B2B network,we propose the Robust Routing Algorithm Based on Link Stability in B2B Network(RRLS-B2B)for the frequent change of the topology of B2B network.The algorithm brings the moving speed and direction of the node,and considers the node busy rate and the energy effective amount of the coordinator node.Finally,a most suitable routing path is selected for data transmission by calculating the comprehensive stability of the routing path.The simulation results show that compared with the single-hop strategy,the ECB-TV routing algorithm can ensure the energy consumption balance in normal conditions and low transmission delay in abnormal situation.For the B2B network,the RRLS-B2B routing algorithm proposed in this thesis has good performance in terms of delay,packet loss rate and energy consumption.