Research And Design Of QoS Multicast Routing Algorithm Based On WSN

Sensor networks have broad prospects for the applications. It can be widely used in military, environmental monitoring, forecasting, health care and smart home, as well as surveillance of buildings'state, monitoring of complex machinery, urban transportation, space exploration, large workshops management, security monitoring in airports and so on. With the emergence of QoS strictly required services (such as real-time multimedia services, VoIP, etc.), wireless sensor network should be able to provide the corresponding quality of service (Quality of Service, QoS) ensurence.Sensor network system typically includes sensor (Sensor node), aggregation node (Sink node) and the management node. Within or near the monitoring area (sensor field) randomly deploys a large number of sensor nodes, which can constitute a network by self-organizing. Data are transmitted along the sensor nodes hop-by-hop and probably processed by multiple nodes before reaching the cluster, finally through the Internet or satellite received by management node. Users according to the management nodes configure, manage and issue tasks, as well as collect monitored data.Having the characteristics of multihop path, limited bandwidth, low computing ability and storage capacity and constrained energy, Wireless sensor networks can not copy the QoS routing protocols which work in traditional wired networks and wireless networks with centers. Therefore, new designed QoS routing algorithms specialized for wireless sensor networks are needed. Now it has become a challenging task and research hot spot.The main purpose of our research is to design a QoS routing algorithm in the wireless sensor network. Present achievements are mainly as follows:(1) Considering the wireless sensor network node characteristics and QoS constraints like the residual energy, delay, delay jitter and bandwidth, we propose Surplus Energy Qos Multicast Routing Algorithm based on WSN, SEQMRA-W for short. Our algorithm takes the maximum remainder energy as the first measure, meanwhile taking into account the node bandwidth, delay, delay jitter and so on. We also do some algorithm complexity analysis. Simulation results show the algorithm performs well in routing success rate, multicast tree costs and energy consumption.(2) For the QoS routing problems in mobile wireless sensor network, we introduce the Effective Neighbor and Choice Factor competition mechanisms and then propose a QoS multicast routing mechanism based on Choice Factor. This algorithm generates the optimal path to meet the requirements according to the Choice Factor. Simulation results prove the algorithm correct and effective, also able to enhance the network performance, thus it can be applied to a variety of real-time situation.As the rapid development of multimedia services in wireless sensor networks, QoS assurance has become an important supportive function in sensor network communication. Since the sensor network features makes QoS routing problem more complicated, there are still many urgent problems which need to be further studied.