A weighted interference estimation scheme for interface switching wireless mesh networks
2007 International Conference on Parallel and Distributed Systems
The co-channel interference problem in wireless mesh networks is extremely serious due to the heavy aggregated traffic loads and limited available channels. It is preferable for mesh routers to dynamically switch channels according to the accurate estimation of co-channel interference level in the neighborhood. Most developed interference estimation schemes, however, do not consider the impact of interface switching. Furthermore, the interference between wireless nodes has been extensively
... en extensively considered as an all-or-nothing event. In this paper, we develop a weighted interference estimation scheme (WIES) for interface switching wireless mesh networks. WIES takes a new version of multi-interface conflict graph to estimate the interference relationships between nodes/links. Besides, WIES uses a weight to estimate the interference level of a node/link on another one. The weight utilizes two empirical functions to denote the impacts of the relative distance between mesh nodes and characteristics of traffic loads in wireless mesh networks. Extensive NS2 simulations show that WIES achieves significant performance improvements, especially when the interference level of the network is high. We also validate that the interference level of networks is affected by the system parameters such as the number of available channels and the ratio between interference range and transmission range.