Research On Key Technologies Of Wireless Sensor Networks' Security And Energy Efficiency

Since the entering of 21st century, with the rapid development of new technology, the multi-disciplinary and cross-cutting area has become a hot research topic. The developmentand integration of MEMS (Micro-Electro-Mechanical System), wireless communication, embedded system and sensor technology promoted the emergence and development of wireless sensor networks (WSN). WSN are networks of wireless nodes that are an area for the purpose of monitoring certain phenomena of interest. As a new technology in the field of communication, automation and computer science, it has been researched and applied to many fields including military defense, city management, environment detection and remote monitor and control of dangerous circumstance. With such a background, this paper explores and researches on a wireless sensor network that is easy and quick to construct the networks, smooth to communicate, energy efficient and size small.This paper begins with a review of the research on wireless sensor networks and ad hoc technology. After careful analysis of the project requirements, the energy-efficient Zigbee standard is chosen as the basic network protocol and CC2420 is chosen as the wireless transceiver correspondingly, and the application of the wireless sensor network is constructed on it.This paper focuses on the improvement of AODV's energy-efficiency and time-delay performance. Energy-efficiency is one of the most important requirements in wireless sensor networks. Based on the various research results home and abroad, we propose a new protocol to improve low-mobile Ad Hoc network's energy saving and time delay performance, including judgment of CMMBR'S threshold value, dynamic transmission power modulation, energy aware route selection, flood control and passive route update. Compared with existing research achievements, our energy saving strategy brings the optimization of time delay performance. Using NS-2 to stimulate our proposed protocol, we can see that, it not only improves the energy saving performance, but also deduct the network's time delay time by about 20% to 34%. This paper also focuses on the network's transmission security. After a brief analysis of the probable security threats in Ad Hoc networks, we propose a new protocol named Safe Zone Routing Protocol (SZRP) based on Zone Routing Protocol (ZRP). This hybrid routing protocol compromises the advantages of proactive routing protocol and reactive routing protocol, as well as security mechanism to ensure routing's security. Using NS-2 to simulate SZRP, it demonstrates that we get satisfied results on those performance metrics, namely Average Packet Delivery Fraction, Average Routing Load, Average Routing Acquisition Latency and Percentage of Packets Dropped that Passed through Malicious Nodes.