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It is well known that a packet loss in 802.11 can happen either due to collision or an insufficiently strong signal. However, discerning the exact cause of a packet loss, once it occurs, is known to be quite difficult. In this paper we take a fresh look at this problem of wireless packet loss diagnosis for 802.11-based communication and propose a promising technique called COLLIE. COLLIE performs loss diagnosis by using newly designed metrics that examine error patterns within a physical-layerdoi:10.1109/infocom.2008.124 dblp:conf/infocom/RayanchuMASB08 fatcat:fe2kragi5nc7fipyrkbkynzrrq