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networks (WSNs) are deployed in inhospitable environments and therefore the nodes are at increased risk of failure. Large scale damage may partition a network into disjoint segments, which has very negative effect on the application. Mobile nodes have been exploited to act as mobile data collectors (MDCs) among segments to restore the connectivity of WSNs in the previous works. However, almost all of the works assumed that mobile nodes travel via a direct path, which may not be the case in real-world applications. In order to improve the applicability of the recovery strategy, obstacles should be taken into account. In this paper, we present an obstacle aware connectivity restoration strategy (OACRS) to fit these requirements. Our algorithm is designed for the scenarios that the number of available relays is less than the number of relays required to construct stable links and more than the number of segments. At first we construct and optimize the obstacle-avoiding minimum spanning tree of the segments and then determine the relays which keep static and the ones which act as MDCs. 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The effectiveness of the proposed algorithm is validated through simulation experiments. <\/jats:p>","DOI":"10.1155\/2016\/6469341","type":"journal-article","created":{"date-parts":[[2016,5,17]],"date-time":"2016-05-17T21:03:20Z","timestamp":1463519000000},"page":"6469341","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":8,"title":["Obstacle Aware Connectivity Restoration for Disjoint Wireless Sensor Networks Using a Mix of Stationary and Mobile Nodes"],"prefix":"10.1177","volume":"12","author":[{"given":"Guizhen","family":"Ma","sequence":"first","affiliation":[{"name":"State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China"},{"name":"Tourism College of Beijing Union University, Beijing 100106, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yang","family":"Yang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xuesong","family":"Qiu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhipeng","family":"Gao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2016,5,17]]},"reference":[{"key":"B1-2016-6469341","doi-asserted-by":"publisher","DOI":"10.1109\/jsen.2015.2493102"},{"key":"B2-2016-6469341","doi-asserted-by":"publisher","DOI":"10.1109\/tpds.2014.2333011"},{"key":"B3-2016-6469341","doi-asserted-by":"publisher","DOI":"10.1109\/jsen.2014.2357030"},{"key":"B4-2016-6469341","doi-asserted-by":"publisher","DOI":"10.1109\/tc.2013.85"},{"key":"B5-2016-6469341","doi-asserted-by":"publisher","DOI":"10.1109\/jsen.2015.2426177"},{"key":"B6-2016-6469341","doi-asserted-by":"publisher","DOI":"10.1109\/tc.2009.120"},{"key":"B7-2016-6469341","first-page":"1","volume-title":"Proceedings of the IEEE International Conference on Communications (ICC '11)","author":"Mi Z."},{"key":"B8-2016-6469341","doi-asserted-by":"publisher","DOI":"10.1002\/dac.2819"},{"key":"B9-2016-6469341","doi-asserted-by":"publisher","DOI":"10.1109\/ICC.2012.6364467"},{"key":"B10-2016-6469341","doi-asserted-by":"publisher","DOI":"10.1109\/jsen.2015.2456931"},{"key":"B11-2016-6469341","doi-asserted-by":"publisher","DOI":"10.1016\/j.adhoc.2014.07.003"},{"key":"B12-2016-6469341","doi-asserted-by":"publisher","DOI":"10.1109\/TMC.2009.161"},{"key":"B13-2016-6469341","doi-asserted-by":"publisher","DOI":"10.1109\/lcn.2012.6423631"},{"key":"B15-2016-6469341","volume-title":"Proceedings of the IEEE International Symposium and Computers and Communications (ISCC '12)","author":"Senturk I."},{"key":"B16-2016-6469341","volume-title":"Proceedings of the 4th ACM International Workshop on Mobility Management and Wireless Access (MOBIWAC '06)","author":"Chatzigiannakis I."},{"key":"B17-2016-6469341","doi-asserted-by":"publisher","DOI":"10.1109\/VTCFall.2012.6399097"},{"key":"B18-2016-6469341","doi-asserted-by":"crossref","unstructured":"Stanislaus J. 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