ACM Transactions on Computer Systems (TOCS)
A high-throughput path metric for multi-hop wireless routing
Proceedings of the 9th annual international conference on Mobile computing and networking
Comparison of routing metrics for static multi-hop wireless networks
Proceedings of the 2004 conference on Applications, technologies, architectures, and protocols for computer communications
Routing in multi-radio, multi-hop wireless mesh networks
Proceedings of the 10th annual international conference on Mobile computing and networking
On accurate measurement of link quality in multi-hop wireless mesh networks
Proceedings of the 12th annual international conference on Mobile computing and networking
Studying wireless routing link metric dynamics
Proceedings of the 7th ACM SIGCOMM conference on Internet measurement
What is wrong with broadcast probing based ETX estimation for wireless links?
Proceedings of the 10th ACM international symposium on Mobility management and wireless access
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In wireless mesh routing, it is common to use periodic estimation of link quality to identify high throughput paths. While extensive work has been devoted to the design and static throughput evaluation of path metrics, evaluating the accuracy of the underlying link cost metrics under dynamic conditions has not received due attention. We introduce an experimental and analytical methodology that quantifies the ability of link cost metrics to accurately estimate link capacity. We use this methodology on a wireless mesh testbed to evaluate network layer and cross-layer estimation approaches of ETT, a popular wireless link cost metric. Our results show that the network layer approach exhibits low correlation with link capacity across time and across multiple links. On the other hand, cross layer information obtained by our methodology can significantly improve accuracy and can aid in identifying the dominant factors that lead to link cost metric inaccuracies.