Abstract
Radio frequency spectrum is a finite and scarce resource. How to efficiently use the spectrum resource is one of the fundamental issues for multi-radio multi-channel wireless mesh networks. However, past research efforts that attempt to exploit multiple channels always assume channels of fixed predetermined width, which prohibits the further effective use of the spectrum resource. In this paper, we address how to optimally adapt channel width to more efficiently utilize the spectrum in IEEE802.11-based multi-radio multi-channel mesh networks. We mathematically formulate the channel width adaptation, logical topology design, and routing as a joint mixed 0-1 integer linear optimization problem, and we also propose our heuristic assignment algorithm. Simulation results show that our method can significantly improve spectrum use efficiency and network performance.
Highlights
Wireless mesh networks (WMNs) consist of a multihop backbone of mesh routers which collect and relay the traffic generated by mesh clients [1]
The use of multiple radios which tuned into different channels can significantly improve the network capacity by employing concurrent transmissions under different channels, and that motivates the development of new protocols for multi-radio multi-channel (MR-MC) mesh networks
We model the wireless mesh networks by an undirected graph G(V, E), where V denotes the set of all vertices and E denotes the set of all edges
Summary
Wireless mesh networks (WMNs) consist of a multihop backbone of mesh routers which collect and relay the traffic generated by mesh clients [1]. By optimally adjusting channel width for every link, we can get the most efficient spectrum assignment scheme as Figure 2(d) shows. In a scenario with many interfering links, by “creating” more small-width orthogonal channels, we can greatly reduce the phenomena of contention and collision, and improve throughput as a result of fewer back-offs and reduced interference Another motivation for the channel width adaptable network architecture is the recent open spectrum effort [7] made by the spectrum regulation authority such as FCC. Our mathematical formulation takes into account the issues in traditional MR-MC mesh networks, such as the number of available interfaces, the interference constraints, and the expected traffic load, and determines at what center frequency and how wide a spectrum band an interface should use.
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