Designing QoS Routing Protocols In MANETs

Mobile Ad-hoc NETworks (MANETs) are mobile and wireless networks without the support of any preestablished infrastructure, which is typically characterized by no centralized access, self-organizing, rapid deployment, dynamic topology, multiple hops, and so on. Due to such characteristics, MANETs have great potentials in many applications such as military combat readiness, disaster recovery, environment monitoring. With the prevalence of multimedia applications, it has become an important research field to provide QoS in MANETs.Due to the mobility of node and unpredicted change of topology in MANETs, it is difficult to discover and maintain routing path, especially in large scale networks building long routing path from the source to the destination that satisfies the QoS.This thesis proposes Piecewise QoS Routing Protocol(PQR) based on the segment by segment routing. It uses the anchor to maintain local topology information and builds the path segment by segment. It can improve the routing success ratio effectively and reduce the transmitting delay of data packets.This thesis also proposes a QoS routing protocol based on clustering. According to the connectivity degree and neighbour link bandwidth of node, this protocol divides the networks into clusters. In the case of intra-cluster, the members use the clustering routing table to route. In the case of inter-clusters, this protocol divides the networks into ring topology, then according to different routing requests, it uses different routing schemes to send data packets, thus it can improve the performance of the whole network.Simulation studies show that the proposed QoS routing protocols can improve the successful ratio of routing and have good performance in large scale networks.