Abstract: Recent researches show network coding can improve data transmission reliability in wireless sensor networks, existing network coding-based data transmission strategies select encoding vectors randomly and use fixed paths to transmit packets, which causes performance deficiencies. This paper designs a new scheme for constructing encoding matrix, and proposes a novel reliable data transmission method. Any k encoding vectors of the new encoding matrix are linearly independent and encoding vectors are not need to be transmitted to sink. Data forwarding uses “region pushing” mechanism, which automatically selects the best forwarding nodes to “push” packets from one area to another area closer to sink. Analysis and simulation results illustrate that the new proposed method can improve data transmission reliability and reduce network energy consumption.

Key words: wireless sensor network, network coding, data transmission, encoding matrix, reliability

摘要： 网络编码能提高无线传感器网络数据传输可靠性，针对现有基于网络编码的数据传输策略随机选取编码向量和使用固定路径所带来的缺陷，设计了一个新的编码矩阵构造方法，并提出了一种新型的基于网络编码的可靠数据传输方法。该编码方案能保证任意k个编码向量线性无关，且不用传输编码向量。数据转发使用“区域推进”机制，自动选取最佳转发节点，将数据包可靠地向sink“推进”，并实现了最少冗余传输和网络均衡能耗。分析与仿真表明，新的数据传输策略能消除现有方法的缺陷，提高数据传输可靠性，降低能耗。

关键词: 无线传感器网络, 网络编码, 数据传输, 编码矩阵, 可靠性