Wireless Mesh Networks (WMN) operating in the 5 GHz band must implement Dynamic Frequency Selection (DFS) capabilities to cope with the presence of radar systems operating in the same frequencies. In particular, upon detection of a radar event, WMN devices must switch to a different channel within a given time specified by radio regulations. This is not only mandatory to avoid interference to radar systems, but is also convenient since radar pulses are a source of interference to the WMN itself. In this work we propose a solution for the deployment of WMNs using channels co-located with radar systems in an efficient and reliable manner. Our contribution is two-fold. First, we specify a distributed coordinated channel change procedure which reacts efficiently to radar events. We then formulate an optimization problem to find the best channel allocation which explicitly takes DFS into account, and provide a heuristic algorithm to solve it. We assess the proposed approach numerically and by simulation. Evaluation results motivate our work by confirming that DFS, which has been disregarded in previous work on WMN channel assignment, may have a significant impact on the performance of the network, and show that our solution is effective in finding a good trade-off between channel spatial reuse and DFS management.
|Autori:||Vallati, Carlo; Mingozzi, Enzo|
|Titolo:||Efficient design of wireless mesh networks with robust dynamic frequency selection capability|
|Anno del prodotto:||2015|
|Digital Object Identifier (DOI):||10.1016/j.comnet.2015.01.009|
|Appare nelle tipologie:||1.1 Articolo in rivista|