无线传感器网络跳数和通信距离自适应差错控制策略

Adaptive error control scheme for wireless sensor networks based on hops and communication distance

无线传感器网络(WSNs)的动态信道特性、网络带宽和节点能量受限等特点,使得在无线环境下为数据传输提供可靠性保证面临更大的挑战.本文提出一种适用于WSNs的自适应链路层差错控制策略(AEC--Hops/RSSI),以便改善WSNs的通信性能.首先建立数学模型,分析数据帧被转发所经历的跳数与能效的变化规律,然后分析前向纠错(FEC)、自动重传请求(ARQ)和Chase合并的混合自动重传请求(HARQ)能效与数据帧的发送节点与下一跳接收节点之间的通信距离之间的规律,最后根据跳数原则和通信距离原则建立一种自适应差错控制策略,为数据帧选择最佳差错控制策略.数学分析表明,该策略有效地提高了WSNs中多媒体数据传输的可靠性同时保持高能效.

The reliability guarantee of data delivery over wireless sensor networks（WSNs） is a big challenge due to the unreliable and dynamic characteristics of WSNs,limited bandwidth and battery power of sensor nodes.This paper proposes an adaptive error control mechanism for WSNs,called AEC--Hops/RSSI,in order to improve the communication performance of WSNs.First,based on the mathematical analysis model,the characteristics of the hops of link layer frames with the energy consumption is researched deeply.Second,the feature of communication distance between sending node of link layer frames and next-hop receiving node with the energy efficiency is discussed,which is between forward error correction（FEC）,automatic repeat request（ARQ） and chase combing hybrid ARQ（HARQ）.Finally,according to the above analytical results,an adaptive error control mechanism（AEC--Hops/RSSI） is proposed,which can improve the performance of WSNs communication by scheduling the optimal error control mechanisms.The mathematical analysis shows that the AEC--Hops/RSSI mechanism achieves better performance compared with FEC,ARQ and HARQ,in terms of communication reliability and energy efficiency in WSNs.