An Event-Driven Spectrum-Aware Routing Protocol Based on Hungarian Algorithm in Cognitive Radio Sensor Networks

An event-driven spectrum-aware routing algorithm based on the Hungarian algorithm (ESRH) is proposed to improve the spectrum utilization and the energy efficiency of cognitive radio sensor networks(CRSN). The method performs clustering in a distributed and self-organized manner and selects the node with the largest weight as the cluster head (CH). The Hungarian algorithm is used to assign the channels with smaller occupancy probability of primary user (PU), longer idle time and higher throughput to sensor nodes (SUs), which reduces the channel competition from SUs to PUs and improves the data transmission success rate. The gateway nodes and packet forwarding nodes are used for relay communication between clusters. Simulation results show that ESRH outperforms ESAC and ERP algorithms in terms of transmission performance, routing stability and network lifetime in a multi-round event-driven CRSN.