A high-throughput path metric for multi-hop wireless routing

This paper presents the expected transmission count metric (ETX), which finds high-throughput paths on multi-hop wireless networks. ETX minimizes the expected total number of packet transmissions (including retransmissions) required to successfully deliver a packet to the ultimate destination. The ETX metric incorporates the effects of link loss ratios, asymmetry in the loss ratios between the two directions of each link, and interference among the successive links of a path. In contrast, the minimum hop-count metric chooses arbitrarily among the different paths of the same minimum length, regardless of the often large differences in throughput among those paths, and ignoring the possibility that a longer path might offer higher throughput. This paper describes the design and implementation of ETX as a metric for the DSDV and DSR routing protocols, as well as modifications to DSDV and DSR which allow them to use ETX. Measurements taken from a 29node 802.11b test-bed demonstrate the ...

• Type: Conference
• Year: 2003
• Where: MOBICOM
• Authors: Douglas S. J. De Couto, Daniel Aguayo, John C. Bicket, Robert Morris
• Keywords: ETX Improves Performance, Metric, MOBICOM 2003, Multi-hop Wireless Networks