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The proposed scheme uses only two anchor nodes and uses bilateration to estimate the coordinates of unknown nodes. Many localization algorithms for WSNs require the installation of extra components, such as a GPS, ultrasonic transceiver, and unidirectional antenna, to sensors. The proposed localization scheme is range-free (i.e., not demanding any extra devices for the sensors). In this scheme, two anchor nodes are installed at the bottom-left corner (Sink X) and the bottom-right corner (Sink Y) of a square monitored region of the WSN. Sensors are identified with the same minimum hop counts pair to Sink X and Sink Y to form a zone, and the estimated location of each unknown sensor is adjusted according to its relative position in the zone. This study compares the proposed scheme with the well-known DV-Hop method. Simulation results show that the proposed scheme outperforms the DV-Hop method in localization accuracy, communication cost, and computational complexity. <\/jats:p>","DOI":"10.1155\/2013\/620248","type":"journal-article","created":{"date-parts":[[2013,1,16]],"date-time":"2013-01-16T21:04:11Z","timestamp":1358370251000},"page":"620248","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":22,"title":["Range-Free Localization Scheme in Wireless Sensor Networks Based on Bilateration"],"prefix":"10.1177","volume":"9","author":[{"given":"Chi-Chang","family":"Chen","sequence":"first","affiliation":[{"name":"Department of Information Engineering, I-Shou University, Kaohsiung 84001, Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chi-Yu","family":"Chang","sequence":"additional","affiliation":[{"name":"Department of Information Engineering, I-Shou University, Kaohsiung 84001, Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yan-Nong","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Information Engineering, I-Shou University, Kaohsiung 84001, Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2013,1,16]]},"reference":[{"key":"B1-2013-620248","doi-asserted-by":"crossref","first-page":"2926","DOI":"10.1109\/GLOCOM.2001.965964","volume-title":"IEEE Global Telecommunicatins Conference (GLOBECOM\u203201)","volume":"5","author":"Niculescu D."},{"key":"B2-2013-620248","doi-asserted-by":"publisher","DOI":"10.1007\/978-0-387-49592-7_7"},{"key":"B3-2013-620248","doi-asserted-by":"publisher","DOI":"10.1002\/0470095121"},{"first-page":"166","volume-title":"Proceedings of the 7th Annual ACM\/IEEE International Conference on Mobile Computing and Networking (MobiCom \u203201)","author":"Savvides A.","key":"B4-2013-620248"},{"key":"B5-2013-620248","doi-asserted-by":"publisher","DOI":"10.1109\/SAHCN.2006.288442"},{"key":"B6-2013-620248","doi-asserted-by":"publisher","DOI":"10.1109\/98.878533"},{"first-page":"489","volume-title":"Proceedings of the 21st IEEE International Conference on Distributed Computing Systems (ICDCS-21\u203201)","author":"Bulusu N.","key":"B7-2013-620248"},{"first-page":"81","volume-title":"Proceedings of the 9th Annual International Conference on Mobile Computing and Networking (MobiCom \u203203)","author":"He T.","key":"B8-2013-620248"},{"key":"B9-2013-620248","doi-asserted-by":"publisher","DOI":"10.1109\/MWC.2009.4907560"},{"key":"B10-2013-620248","doi-asserted-by":"publisher","DOI":"10.1109\/TPDS.2008.239"},{"key":"B11-2013-620248","doi-asserted-by":"publisher","DOI":"10.1007\/s11235-010-9395-y"},{"key":"B12-2013-620248","doi-asserted-by":"publisher","DOI":"10.3390\/s120100839"},{"first-page":"321","volume-title":"Proceedings of the International Conference on Embedded and Ubiquitous Computing (IFIP \u203207)","author":"Li X.","key":"B13-2013-620248"},{"first-page":"685","volume-title":"Proceedings of the 23rd International Conference on Distributed Computing Systems Workshops","author":"Li K.","key":"B14-2013-620248"},{"key":"B15-2013-620248","doi-asserted-by":"publisher","DOI":"10.1023\/B:TELS.0000029040.85449.7b"}],"container-title":["International Journal of Distributed Sensor Networks"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/journals.sagepub.com\/doi\/pdf\/10.1155\/2013\/620248","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/journals.sagepub.com\/doi\/full-xml\/10.1155\/2013\/620248","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/journals.sagepub.com\/doi\/pdf\/10.1155\/2013\/620248","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,5,16]],"date-time":"2021-05-16T17:33:54Z","timestamp":1621186434000},"score":1,"resource":{"primary":{"URL":"http:\/\/journals.sagepub.com\/doi\/10.1155\/2013\/620248"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2013,1,1]]},"references-count":15,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2013,1,1]]}},"alternative-id":["10.1155\/2013\/620248"],"URL":"https:\/\/doi.org\/10.1155\/2013\/620248","relation":{},"ISSN":["1550-1477","1550-1477"],"issn-type":[{"type":"print","value":"1550-1477"},{"type":"electronic","value":"1550-1477"}],"subject":[],"published":{"date-parts":[[2013,1,1]]}}}