Based On The Ns2 Wireless Multimedia Sensor Networks, Multi-path Routing Algorithm Simulation And Realization

Wireless Sensor Networks as a kind of multi-hop, self-organization distributed wireless network, which consist of large of micro sensors with wireless communications and computation capability, have wide applications, including military, environment monitoring, medical monitoring, traffic control, industrial and manufacturing automation, and so on. Wireless Sensor Networks have become a hot research topic and attracted much focus from military, academic and industrial fields since they appeared. Audio, video and images are introduced into the traditional Wireless Sensor Networks because of the environment complexity and multimedia devices low costing. This gave birth to Wireless Multimedia Sensor Networks, a kind of special Wireless Sensor Networks. Wireless Multimedia Sensor Networks have the virtue of Wireless Sensor Networks'self-organization, unattended, and they introduced the advantages of the multimedia technology's rich sensing.Because of introducing the multimedia content sensing, on the one hand Wireless Multimedia Sensor Networks have the character of Wireless Sensor Networks'limited resources, multi-hop and so on. On the other hand Wireless Multimedia Sensor Networks have much higher requirements on the energy cost and quality of service. So the technologies of traditional Wireless Sensor Networks can not meet the Wireless Multimedia Sensor Networks'requirements and should be improved or new ideas should be created. Because of the specialty and wide applications of the Wireless Multimedia Sensor Networks, the related technologies of the Wireless Multimedia Sensor Networks have become the new research hotspots. The research topics of Wireless Multimedia Sensor Networks are very wide, including bottom devices, communication protocols. Among of them, the routing of communication protocols is one of the key problems. This paper mainly researches the. Wireless Multimedia Sensor Networks'routing and it's simulation on NS2.Firstly, we introduced the present simulation tools of Wireless Sensor Networks. Although some simulation tools support Wireless Sensor Networks simulating, they did not consider the environment. Under the real scene, the sensors start to send messages to the monitor node and tell what happened, when the temperature varied or someone entered the monitor fields. This will cause the change of Wireless Sensor Networks'behaviors. The simulation tools now have not the environment model. So the simulation can not exactly reflect the changes of the Wireless Sensor Networks'behavior when the monitored target changed. This paper added the environment model above the NS2 basic framework according to the owned character of Wireless Sensor Networks. In the environment model, we defined the environment node which simulating the monitored target and the sensing channel which is used to transfer messages between environment nodes and sensor nodes. The environment node can send messages to the sensor nodes by the special sensing channel periodically or triggered to simulate the behavior when the monitored environment or target changed. At the same time, the extension of simulation for specific sensor network applications is discussed and the extension method is proposed.Secondly, this paper introduced the challenges and research status and analyzed the ant colony algorithm. We proposed a new multipath routing algorithm for the Wireless Multimedia Sensor Networks according to Wireless Multimedia Sensor Networks'character and the ant colony algorithm's self-organization, adaptive, dynamic optimization. The traditional ant colony algorithm has two problems when it is used to search path from the source node to the sink node in the Wireless Multimedia Sensor Networks. One is that algorithm is easy to fall into local optimum. The artificial ants may stop when they search, so it can not find the global optimum path. One another, when the global optimum path was found, all messages would be transferred along it. Then all the nodes among this path would die quickly because of energy cost rapidly. And the lifetime of the whole network would be affected. So this paper proposed multipath routing algorithm based on the ACS ant colony algorithm, and combined the ant-net algorithm and the max-min ant colony, algorithm. This algorithm can find the best global optimum path in parallel and keep the second best path to form multipath. The multipath routing can meet the high bandwidth of the Wireless Multimedia Sensor and improved quality of service. Finally, the proposed algorithm is evaluated in the simulation environment and compared to the DD algorithm. The results show the proposed algorithm has better performance.