Research On Cluster-based Routing Protocol In Multimedia Sensor Network

Wireless sensor networks, integrated with wireless communication techniques, embedded computation techniques, sensor techniques and distributed computation techniques, have become a hot research area of computer science and technology. The availability of low-cost hardware such as CMOS cameras and microphones and people's urgent demand of images, video and audio data has fostered the development of Multimedia Sensor Networks (MSNs). MSNs are expected to support multimedia services such as delivery of video and audio streams. The distinct features of multimedia sensor networks are various media category, large volume of data and complex processing task, thus can perform a complete and accurate environment monitoring. In the design of routing protocol, an important topic is to improve the energy efficiency as well as to satisfy QoS requirements at the same time.Because excellent network topology control can effectively reduce energy consumption of the nodes, prolong the network life cycle and improve performance of routing protocol. Cluster-based routing algorithm and real-time protocol was elaborated in this thesis. An efficient routing protocol called Cluster-based Real-time Protocol (CBRP) was proposed. In order to balance network load in wireless sensor network, CBRP suggests a physical/medium access control/network cross-layer analytical approach to determine the optimal number of clusters, on which the division of network region into uneven virtual grids is based. A node, according to its residual energy and the barycenter, independently makes its decision to compete for becom a cluster head. In the backbone networks, which are made of cluster heads transmit the data to the sink via multiple hops communication. In order to meet QoS transmission requirements as well as to balance network load in network at the same time, each data packet of cluster nodes has been classified according to the real-time demand. CBRP automatically adjusts data packets transmission rate dynamically and features an energy-balance forwarding policy.This thesis uses mobility framework based on OMNeT++ simulation software to simulate our proposed cluster-based protocol. Simulation results show that CBRP meets the requirement of QoS in real-time and reliability domains and can prolong the network life cycle.