基于链路层重传的传感器网络可靠传输模型

Reliable Transfer Model for Wireless Sensor Networks Based on Data Link Layer Retransmission

无线传感器网络的通信链路是极其不可靠的。提出了路径效率这一新的链路质量度量参数,以路径效率为主要指标分析了传统的数据链路层可靠传输模型,并提出了一种以效率为中心的组确认模型,该模型通过减少反向链路数据重传请求包的个数,有效地降低数据传输中的冗余信息,极大地提高网络的路径效率,从而节约能耗。通过NS-2仿真工具对组确认模型的性能进行了测试,结果表明该模型更适合于资源受限的传感器网络的应用。

Communication links between wireless sensor networks are extremely unreliable. A new metric of wireless link quality, path efficiency, was brought forward; and traditional reliable transfer models of data link layer were analyzed based on the parameter. A new Group-based Acknowledgement model, which was efficiency centric, was brought forward to guarantee reliable transfer. Through reducing the retransmission request packets, the new model could effectively decrease redundant information in the process of data delivery and improve the path efficiency of the whole network, which ensured energy conversation. Performance of the Group-based Acknowledgement model was tested through experiment using NS-2. The result proves that the new model is more suitable for the application of resource limited sensor networks.