基于RSSI组播环境下的中继网络编码协作传输策略研究

Research on collaborative transmission strategy of relay aided network coding based on RSSI multicast environment

最大限度减少汇聚节点在处理数据过程中能量的耗散,是设计无线传感器网络主要目标之一,相比较传统自动重发请求（ARQ）传输机制,网络编码能够提高MAC层数据包数据传输的效率,减少中继节点在通信过程中承担过多的数据处理任务。但是实际应用的场景往往比较复杂,经常存在因为节点之间通信距离过长,被检测的目标时刻移动等问题,从而产生数据包转发效率低,节点的能耗较高的现象。通过分析组播环境下的无线传感器网络,利用RSSI筛选出相应的中继节点,结合中继辅助下的网络编码传输机制,减少数据包重传次数的同时,降低了汇聚节点在数据处理过程中的能耗。数值仿真结果表明,该RA-RANC策略相比传统的网络编码策略,在减少广播完成的时间和提高数据转发效率方面较好,更适用于实际应用场景。

Minimizing the energy dissipation of sink nodes during the process of data process is one of the main goals of designing wireless sensor networks.Compared with the traditional automatic repeat request（ARQ）transmission mechanism,network coding can improve the efficiency of data packet transmission in MAC layer,and reduce the massive data processing tasks of relay node in the communication process.However,it is often more complicate in the reality scene,due to the communication distance between nodes is too long,the detected target always moving and other issues,resulting the data packet forwarding efficiency is low and node’s energy consumption is too high.In this paper,by analyzing the multicast environment of wireless sensor networks,we select the corresponding relay nodes by using RSSI and combine with the relay aided network transmission mechanism,at the same time,it reduces the number of packet retransmission,and decrease the energy consumption in the data processing.Numerical simulation results show that,the RA-RANC strategy is better than the traditional network coding in the aspect of reducing the broadcast completion time and improving the data forwarding efficiency,and is more suitable for the practical application.