QoS Aware Hierarchical Routing Protocol Based on Signal to Interference plus Noise Ratio and Link Duration for Mobile Ad Hoc Networks.

Though node mobility allows quick network setup for Mobile Ad Hoc Networks (MANETs), it can lead to route failure if improper movements are taken. Therefore, how to maintain the reliability of routes has always been a challenge in MANETs. Since routes are composed of relaying-nodes hop-by-hop, how to select reliable relay nodes is of great importance. Existing researches of routing protocol mainly utilize the metric of Hop or Received Signal Strength (RSS), which ignores the interference from other nodes and cannot make a good indication for link quality. In allusion to this problem, we propose an extension of OLSR protocol, named QoS aware Hierarchical Routing Protocol (QHRP), by replacing its relay-node selection policy. To be specific, we use a new metric combining estimated signal to interference plus noise ratio (SINR) and link duration (LD) instead of the number of hops used in OLSR. Since SINR considers the accumulative interference from neighbor nodes, and LD considers the lifetime per link, it is expected that routes generated by QHRP can be more reliable. Extensive simulations show that QHRP can achieve an outstanding performance in terms of calculation of route, overhead and packet drop ratio.