Delay and Capacity Optimization in Multi-radio Multi-channel Wireless Mesh Networks

The technology of wireless mesh network (WMN) provides a flexible Internet access service in a wide region by employing multi-hop wireless routing and enhances the network performance by utilizing multi-radio and multi-channel. Delay analysis is a fundamental issue for delay-sensitive application such as VoIP and video conference, and delay constrained capacity is essential for a network to provide satisfied service. This paper models such a network and obtains the packet delay and network capacity by considering a queueing network formed by multi-radio mesh routers (MRs) and carrier sense multiple access (CSMA) mechanism is assumed for packet transmissions over links between MRs. We investigate the problems of intercluster dominated traffic, study the impact of the number of radios and channels to the delay and the capacity, and optimize the network performance by adjusting the MR deployment and the transmission power.