The channel adaptive routing for hybrid networks

Ad hoc network is expected to play a major role in future wideband wireless access to the Internet. The dual mode system that multi-hop network overlaid with a cellular structure is more and more attractive for researchers. However, routing is important for such networks due to the dynamic nature of network topology and the resource constraints. To maximize the resource utilization and minimize the network transfer delay along the path, the shortest path with minimum hops approach is often adopted. However, the quality of wireless channel among the mobile nodes is time varying due to fading, shadowing and path loss. Considering adaptive channel coding and modulation scheme, the channel state can be characterized by different link throughput. In this paper, a channel adaptive routing (CHAR) is presented. The CHAR transform link throughput into the channel quality factor and finds the shortest routing according to the channel quality measure. Simulation results show that the proposed routing may reduce the average transfer delay and increase the packet deliver rate.