Study On Routing Protocols In Wireless Sensor Network With Mobile Sink

Wireless sensor network (WSN) contains two main types of nodes, the sensor nodes for data collection and the sink nodes for aggregation of data. A large number of sensor nodes distributed in the region constituted the communication network by the way of self-organization, and the en-vironment information collected by the sensor nodes are transmitted to the sink nodes by the way of multi-hop, then the sink nodes transmit data to the users. Previously, nodes are stationary in WSN. In recent years, with the diversity development of WSN applications, nodes need to have the ability to move in some application scenarios, such as battlefield re-connaissance, 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 around sink, thus extend-ing the life cycle for the energy-constrained network. Hierarchical routing protocol TTDD (Two-Tier Data Dissemination) proposed a solution for mobility problems which has been widely recognized by researchers, and the core idea is to build a virtual grid structure in the whole network and set two agents for mobile Sink nodes. Based on in-depth studying TTDD protocol, this paper proposes an improved routing protocol I-TTDD fo-cusing on the deficiencies of large overhead on building and maintaining grid structure and simple scenarios. The main idea of the improved pro-tocol is to build a multiplexed grid structure with clustering algorithm, which made energy consumption reduced. while the improved protocol supports networks with different priority data types, supports for que-ry-driven data communication model, and enriches the application sce-narios. Experiments of two routing protocols of I-TTDD and TTDD are conducted in the NS2simulation environment, and verified that the ad-vanced of I-TTDD. Finally, based on the summary description, the lack of direction and improvement of existing work are illustrated.