基于链路可靠性的两跳QoS路由

针对工业无线传感器网络对路由协议的QoS要求，研究了一种基于链路可靠性的两跳QoS路由（Link-Reliability Based Two-Hop Routing for QoS Guarantee in Industrial Wireless Sensor Networks， LRTHQR）.采用两跳速度策略和数据优先级调度策略提高实时性，采用改进的信任评估模型以选择可信路径进行路由，采用基于接收功率的链接概率和数据包重传次数作为衡量链路可靠性的指标，同时采用能够综合考虑节点剩余能量和转发能耗的转发策略，以改善网络寿命.仿真结果显示：与未考虑链路可靠性的NCSRT （NodeCredible Security Routing for IWSN Based on THTR）算法相比， LRTHQR算法在丢包率、时延以及包平均能耗方面有着明显优势；与同样侧重QoS要求的LRTHR （Link-Reliability based Two-Hop Routing）算法相比， LRTHQR算法在截止期错失率、路由开销以及包平均能耗方面有着显著提升.

Research on Two-hop QoS Routing Based on Link Reliability

Aiming at the quality of service (QoS) requirements of industrial wireless sensor networks for routing protocols, a link-reliability based two-hop QoS routing (LRTHQR) is studied. The two-hop speed strategy and packet prioritization strategy are adopted to improve the real-time performance. The improved trust evaluation model is adopted to select the trusted path for routing. The link probability and the number of packet retransmissions based on the received power are used as the indicators to measure the link reliability. Meanwhile, the forwarding strategy, which can comprehensively consider the residual energy of nodes and the energy consumption of forwarding, is adopted to improve the network lifetime. The simulation results show that compared with the NCSRT (node credible security routing for IWSN based on THTR) algorithm without considering the link reliability, the LRTHQR algorithm has remarkable advantages in packet loss rate, delay, and packet average energy consumption. Compared with the link-reliability based two-hop routing (LRTHR) algorithm, which also focuses on QoS requirements, the LRTHQR algorithm features significant improvements in deadline miss rate, routing overhead, and average packet energy consumption.