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JORCA: joint opportunistic routing and channel assignment

Opportunistic routing (OR) can improve the throughput of wireless mesh networks (WMNs). Most existing studies on OR focus on single-radio WMNs, where the severe interference may largely decrease the performance. Only a few works have studied OR in multi-radio multi-channel WMNs, while they either select opportunistic route with given channel assignment, or assign channel based on selected opportunistic routing, which separate the interdependency of opportunistic routing and channel assignment, and can hardly achieve good performance. This paper formulates the joint problem of opportunistic routing and channel assignment as a mixed integer programming (MIP) problem and proves it to be NP-hard. To solve it, we propose a heuristic iterative algorithm named joint opportunistic routing and channel assignment (JORCA) which exploits multi-user diversity and channel resource. The simulation results demonstrate that, comparing with the two existing solutions, JORCA improves 44% and 15.5% in total throughput.