ACM Transactions on Computer Systems (TOCS)
Capacity of Ad Hoc wireless networks
Proceedings of the 7th annual international conference on Mobile computing and networking
A high-throughput path metric for multi-hop wireless routing
Proceedings of the 9th annual international conference on Mobile computing and networking
Understanding Link Quality in 802.11 Mobile Ad Hoc Networks
IEEE Internet Computing
Link-level measurements from an 802.11b mesh network
Proceedings of the 2004 conference on Applications, technologies, architectures, and protocols for computer communications
ExOR: opportunistic multi-hop routing for wireless networks
Proceedings of the 2005 conference on Applications, technologies, architectures, and protocols for computer communications
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Several routing protocols for IEEE 802.11 mesh networks that operate at multiple RF channels have been described before [1][2][3]. However, only few facts about link-level characteristics in multi-channel environments have been published. This paper presents observations, made in an indoor testbed, about the impact of channel-assignment on the quality of links.We argue that the assumption 'all radio channels are equal' does not hold in almost all indoor scenarios. Hence, great care must be taken when assigning radio channels to individual links, in order not to spoil network performance. We found that for any given environment the quality and symmetry of a wireless link (quantified by delivery probability) varies significantly depending on the radio channel used. The delivery probability between the best and the worst case could easily exceed a factor of two.However, existing IEEE 802.11 multi-channel protocols assume that all channels are equal, which does not reflect real-world conditions. To remedy to this shortcoming we present the Multi Channel Extremely Opportunistic Routing MCExOR protocol [3].