Risks of using AP locations discovered through war driving Export

@inproceedings{kim:wardriving, abstract = {Many pervasive-computing applications depend on knowledge of user location. Because most current location-sensing techniques work only either indoors or outdoors, researchers have started using 802.11 beacon frames from access points (APs) to provide broader coverage. To use 802.11 beacons, they need to know AP locations. Because the actual locations are often unavailable, they use estimated locations from \\emph{war driving}. But these estimated locations may be different from actual locations. In this paper, we analyzed the errors in these estimates and the effect of these errors on other applications that depend on them. We found that the estimated AP locations have a median error of 35\~{}meters. We considered the error in tracking user positions both indoors and outdoors. Using actual AP locations, we could improve the accuracy as much as 72\% for indoors and 42\% for outdoors. We also analyzed the effect of using estimated AP locations in computing AP coverage range and estimating interference among APs. The coverage range appeared to be shorter and the interference appeared to be more severe than in reality.}, author = {Kim, Minkyong and Fielding, Jeff and Kotz, David}, booktitle = {Proceedings of the Fourth International Conference on Pervasive Computing}, citeulike-article-id = {2820554}, citeulike-linkout-0 = {http://www.cs.dartmouth.edu/~minkyong/papers/minkyong-pervasive06-v20060503.pdf}, citeulike-linkout-1 = {#}, citeulike-linkout-2 = {http://dx.doi.org/10.1007/11748625_5}, doi = {10.1007/11748625_5}, keywords = {crawdad, dartmouth\_wardriving, measurement, wireless}, month = {May}, posted-at = {2008-05-21 17:13:08}, priority = {2}, title = {Risks of using {AP} locations discovered through war driving}, url = {http://dx.doi.org/10.1007/11748625_5}, year = {2006} }

TY - CONF ID - kim:wardriving L3 - citeulike-article-id:2820554 N2 - Many pervasive-computing applications depend on knowledge of user location. Because most current location-sensing techniques work only either indoors or outdoors, researchers have started using 802.11 beacon frames from access points (APs) to provide broader coverage. To use 802.11 beacons, they need to know AP locations. Because the actual locations are often unavailable, they use estimated locations from \\emph{war driving}. But these estimated locations may be different from actual locations. In this paper, we analyzed the errors in these estimates and the effect of these errors on other applications that depend on them. We found that the estimated AP locations have a median error of 35~meters. We considered the error in tracking user positions both indoors and outdoors. Using actual AP locations, we could improve the accuracy as much as 72% for indoors and 42% for outdoors. We also analyzed the effect of using estimated AP locations in computing AP coverage range and estimating interference among APs. The coverage range appeared to be shorter and the interference appeared to be more severe than in reality. TI - Risks of using {AP} locations discovered through war driving T2 - Proceedings of the Fourth International Conference on Pervasive Computing KW - crawdad KW - dartmouth_wardriving KW - measurement KW - wireless AU - Kim, Minkyong AU - Fielding, Jeff AU - Kotz, David PY - 2006/May// UR - http://dx.doi.org/10.1007/11748625_5 ER -