Proceedings of the 10th annual international conference on Mobile computing and networking
Studying wireless routing link metric dynamics
Proceedings of the 7th ACM SIGCOMM conference on Internet measurement
Interference map for 802.11 networks
Proceedings of the 7th ACM SIGCOMM conference on Internet measurement
Minimum Interference Channel Assignment in Multiradio Wireless Mesh Networks
IEEE Transactions on Mobile Computing
CSpy: finding the best quality channel without probing
Proceedings of the 19th annual international conference on Mobile computing & networking
Computer Networks: The International Journal of Computer and Telecommunications Networking
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Multi-channel multi-radio architectures have been widely studied for 802.11-based wireless mesh networks to address the capacity problem due to wireless interference. They all utilize channel assignment algorithms that assume all channels and radio interfaces to be homogeneous. However, in practice, different channels exhibit different link qualities depending on the propagation environment for the same link. Different interfaces on the same node also exhibit link quality variations due to hardware differences and required antenna separations. We present a detailed measurement study of these variations using two mesh network testbeds in two different frequency bands --- 802.11g in 2.4GHz band and 802.11a in 5GHz band. We show that the variations are significant and `non-trivial' in the sense that the same channel does not perform well for all links in a network, or the same interface does not perform well for all interfaces it is paired up with for each link. We also show that using the channel-specific link quality information in a candidate channel assignment algorithm improves its performance more than 3 times on average.