Interference Mitigation In Wireless Mesh Networks Through STDMA Wormhole Switching

Cognitive radio networks offer the promise of adaptively allocating resources on the fly. In this paper, we describe an interference mitigation technique that relies on intelligent resource allocation across a mesh network. In previous work, we presented a method for improving the performance of wireless mesh networks (WMN) through the use of multichannel wormhole switching. An approximate 800-fold improvement was shown in latency with slightly lower path setup times over carrier sense multiple access collision avoidance (CSMA/CA) 802.11-based wireless mesh networks. In addition, the goodput in terms of percent frames successfully received was improved from 40 to 80 percent. In this paper we present the results of applying interference-based conflict graphs and space-time division multiple access (STMDA) scheduling at the cost of increasing the latency to improve the goodput from 80 percent to close to 100 percent.