Research On Routing Protocol For Asymmetric Energy Harvesting Wireless Sensor Network

In recent years,with the advent of energy harvesting technology,energy conversion technology and storage technology,it is possible for wireless sensor networks to get rid of energy-constrained constraints.Therefore,the energy harvesting wireless sensor network(EH-WSN)based on energy acquisition technology came into being.At the same time,some new problems have emerged: the ability of nodes to obtain energy from the outside is asymmetric due to the influence of environment and location.The routing protocol designed for traditional sensor networks is not applicable to EH-WSN.The goal of route optimization in EH-WSN has been transformed to use the collected energy maximize network performance,maintain stable network transmission to improve throughput and energy efficiency.Its routing protocol research is mainly divided into two categories: 1)using the energy harvested as the only energy source,to make the network run permanently under energy harvesting;2)using the energy harvested as an additional supplement to the battery,its purpose is extend the network survival time.This thesis focuses on this topic to study the EH-WSN clustering routing protocol,aiming at how to effectively utilize the node energy acquisition capability,improve the network energy efficiency and maximize network performance.The main research as follows:(1)For EH-WSN in solar environment with asymmetric energy harvesting,study how to construct an energy neutral clustering mechanism.The energy neutral constraint is constructed based on the energy harvesting perception.Under this constraint,introduce dynamic cluster head set to reduce the cluster failure probability,and the reasonable data transmission duty cycle is calculated for the cluster member node combined with the energy neutral constraint and the packet arrival rate,achieve the network continuous operate under energy harvesting conditions.Constructing Type-2 fuzzy logic cluster head selection system,integrating the remaining energy,relative position and the acquisition ability,improve the rationality of the cluster head election.Finally,experimental simulations show that the proposed mechanism can maintain the energy neutral state,and its throughput and energy efficiency is better than other comparative clustering mechanisms.(2)Aiming at the problem of network energy hole caused by multi-hop transmission between clusters,further reducing the throughput and energy efficiency,propose an energy-balanced multi-hop clustering routing protocol under vibration energy supply.Through reasonable regional division strategy,control the number of cluster head nodes in each area of the network to balance the energy consumption.Designing cluster radius adjustment strategy for cluster head nodes based on remaining energy,acquisition capacity and relative position,build a non-uniform hierarchical structure.In the inter-cluster routing stage,the improved gravitational search algorithm is used to optimize inter-cluster routing according to particle evolution,and the conditions of energy balance and energy state are incorporated into the fitness function design,present an energy-balanced inter-cluster data forwarding strategy.Finally,the simulation shows that the protocol can effectively balance network energy consumption,improve network throughput and life cycle.