Collision-Free Channel Assignment Is Possible in IEEE802.11-Based Wireless Mesh Networks
Takuya Yoshihiro, Takahiro Noi · 2017
IEEE802.11-based Wireless Mesh Networks (WMNs) has been deeply studied as a low-cost wireless mesh networks. However, they still suffer from severe interference due to hidden terminals, which significantly degrades the performance to an impractical level. Several studies tried to use multiple frequency channels to avoid collisions among wireless links. However, static channel assignment requires so many orthogonal channels to achieve collision-freedom, resulting in that we still suffer from severe collisions as long as we use the well-populated IEEE802.11 standards. In this paper, we propose a new static channel assignment scheme CASCA (CSMA-aware Static Channel Assignment) that achieves collision-free channel assignment under 3-4 available channels by incorporating a CSMA-aware interference model as well as partially a routing functionality in it. CASCA enables us to realize collision-free WMNs using the license-free IEEE802.11 devices.