QoS保证的传感器网络拓扑控制算法的设计

Design and Simulation of QoS-based Topology Control Algorithm for Wireless Sensor Networks

传感器网络技术的发展对网络服务质量提出了要求,如何在满足一定的服务质量要求前提下实现能量的优化是传感器网络设计必须面对的问题。现有的相关研究主要集中在如何从路由层和链路层来保证一定的QoS指标,本工作将传感器网络中的QoS支持延伸到拓扑管理层,提出了一种支持一定QoS要求的高效的拓扑控制算法,该算法构造一种具有梯度分布特征的节点拓扑结构以平衡网络数据流在sink节点处的聚集。NS2仿真证明了该结构对QoS支持的可行性。仿真表明,该算法以较少的冗余节点增加可将延时和丢包率分别降低50%和40%,证明了该机制在高速率数据场景下的高效性。还通过NS仿真分析了算法实现中关键参数的选取原则。

With the rapid development of wireless sensor networks, the requirements for quality of service are growing, particularly in applications where real time imaging, video or audio communications are involved. The system needs to meet optimized energy consumption design criterion and to satisfy certain QoS requirements at the same time. Most of the existing works deal with strategies on MAC or routing layer to achieve QoS,A novel and efficient topology control algorithm was proposed and QoS support was extended to the topology control layer by introducing a number of active nodes distributed in a gradient fashion based on their logical distances to the sink node, Simulation results show that data loss rate and latency are improved by 50% and 40% respectively at little energy cost. The selection method of some critical parameters in this algorithm was analyzed.