Research Of Wireless Sensor Network Routing Protocols

Wireless sensor network (WSN) is constituted by a large number of sensor nodes distributed inthe region by the way of self-organization, and the environment information collected by the sensornodes are transmitted to the sink nodes by the way of multi-hop, then the sink nodes transmit data tothe users. Previously, nodes are stationary in WSN. In recent years, with the diversity developmentof WSN applications, nodes need to have the ability to move in some application scenarios, such asbattlefield reconnaissance, forest patrol, medical care, and so on.In WSN, sink nodes having the ability to move not only enrich the WSN application scenarios,but also provide an effective way to solve the energy bottleneck problem of the sensor nodes aroundsink, thus extending the life cycle for the energy-constrained network. Hierarchical routing protocolTTDD (Two-Tier Data Dissemination) proposed a solution for mobility problems which has beenwidely recognized by researchers, and the core idea is to build a virtual grid structure in the wholenetwork and set two agents for mobile Sink nodes. Based on in-depth studying TTDD protocol, thispaper proposes an improved routing protocol I-TTDD focusing on the deficiencies of largeoverhead on building and maintaining grid structure and simple scenarios. The main idea of theimproved protocol is to build a multiplexed grid structure with clustering algorithm, which madeenergy consumption reduced. while the improved protocol supports networks with different prioritydata types, supports for query-driven data communication model, and enriches the applicationscenarios. Experiments of two routing protocols of I-TTDD and TTDD are conducted in the NS2simulation environment, and verified that the advanced of I-TTDD. Finally, based on the summarydescription, the lack of direction and improvement of existing work are illustrated.