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.