Collision-Free Channel Assignment with Overlapped Channels in Multi-radio Multi-channel Wireless Mesh Networks

Multi-radio multi-channel (MRMC) technologies can greatly improve the performance of WMNs. In MRMC filed, using partially overlapped channel (POC) assignment is one of the most promising techniques, which can increase the network throughput by taking advantage of more simultaneous transmissions. In this study, we propose a joint routing and channel assignment scheme to achieve collision-free channel assignment with partially overlapped channels while considering traffic engineering. The idea in designing are as following: (1) We design a interference model with POCs. It is possible to enable all channels to be used, and more parallel transmissions result in higher peak throughput. (2) We jointly solve the channel assignment and routing problems using POCs, and we show that POCs are significantly effective to improve spatial reuse in WMNs. By systematically using all channels to avoid interference, we have achieved a higher number of simultaneous transmissions than using only three orthogonal channels.