Energy consumption is a primary concern in the Wireless Sensor Network. This leads to pursue the maximum energy saving at sensor nodes, where a relay is used to transfer the data packet. This leads to the increase in the data gathering latency due to low moving velocity of the mobile collector. In this paper we study the tradeoff between energy saving and data gathering latency in mobile data gathering by exploring a balance between the relay hop count of local data aggregation and the moving tour length of the mobile collector. In this we propose a polling based mobile gathering approach, which leads to optimization problem named bounded relay hop mobile data gathering (BHR - MDG). A subset of sensors are used for the polling points. Thus these are the two efficient algorithms for selecting polling points among sensors.

Wireless Sensor Networks, Mobile Data Gathering, Relay Hop Count, Polling Points, Moving Tour

[1] Bounded Relay Hop Mobile Data Gathering in Wireless Sensor Networks Miao Zhao, Member, IEEE, and Yuanyuan Yang, Fellow, IEEE 2012.
[2] Data Pre-Forwarding for Opportunistic Data Collection in Wireless Sensor Networks Xiuchao Wu, Kenneth N. Brown, and Cormack J. Sreenan Department of Computer Science, University College Cork, Ireland, 2010.
[3] Mobile Relay Configuration in Data-intensive Wireless Sensor Networks Fatme El-Moukaddem, Eric Torng, Guoliang Xing, 2010 .
[4] Analysis of Smartphone User Mobility Traces for Opportunistic Data Collection_Xiuchao Wu Kenneth N. Brown Cormac J. Sreenan Department of Computer Science, University College Cork, Ireland, 2012.
[5] Ubiquitous Data Collection for Mobile Users in Wireless Sensor Networks Zhenjiang Li��, Mo Li�, Jiliang Wang� and Zhichao Cao� �Department of Computer Science and Engineering, Hong Kong University of Science and Technology �School of Computer Engineering, Nanyang Technological University, 2010.
[6] TEEN: A Routing Protocol for Enhanced Efficiency in Wireless Sensor Networks Arati Manjeshwar and Dharma P. Agrawal Center for Distributed and Mobile Computing, ECECS Department, University of Cincinnati, Cincinnati, OH 45221-0030, 2001.
[7] A Coordinated Data Collection Approach: Design, Evaluation, and Comparison William C. Cheng, Cheng-Fu Chou, Leana Golubchik, Member, IEEE, Samir Khuller, and Yung-Chun (Justin) Wan, journal 2004.
[8] A Mobile Embedded Networked Sensor Platform Richard Pon1,2, Maxim A. Batalin1,3, Jason Gordon1,2, Aman Kansal1,2, Duo Liu1,2, Mohammad Rahimi1,3, Lisa Shirachi1,2, Yan Yu1,4, Mark Hansen1,5, William J. Kaiser1,2 , journal 2005.
[9] Joint Mobility and Routing for Lifetime Elongation in Wireless Sensor Networks Jun Luo Jean-Pierre Hubaux School of Computer and Communication Sciences Ecole Polytechnique F&rale de Lausanne (EPFL) , CH-1015 Lausanne, Switzerland , journal 2005.
[10] Mobile Element Scheduling with Dynamic Deadlines Arun A. Somasundara, Aditya Ramamoorthy, Member, IEEE, and Mani B. Srivastava, Senior Member, IEEE, journal 2007.
[11] SenCar: An Energy-Efficient Data Gathering Mechanism for Large-Scale Multihop Sensor Networks Ming Ma, Student Member, IEEE, and Yuanyuan Yang, Senior Member, IEEE journal 2007.
[12] ASAP: An Adaptive Sampling Approach to Data Collection in Sensor Networks Bugra Gedik, Member, IEEE, Ling Liu, Senior Member, IEEE, and Philip S. Yu, Fellow, IEEE journal 2007.
[13] A Distributed Algorithm for Maximum Lifetime Routing in Sensor Networks with Mobile Sink Marios Gatzianas and Leonidas Georgiadis, Senior Member, IEEE journal 2008.
[14] Adaptive Data Collection Strategies for Lifetime-Constrained Wireless Sensor Networks Xueyan Tang, Member, IEEE, and Jianliang Xu, Senior Member, IEEE journal 2008.
[15] Data Gathering in Wireless Sensor Networks with Mobile Collectors Ming Ma and Yuanyuan Yang Department of Electrical and Computer Engineering, State University of New York, Stony Brook, NY 11794, USA journal 2008.
[16] Maximizing the Lifetime of Wireless Sensor Networks with Mobile Sink in Delay-Tolerant Applications Young Sang Yun, Student Member, IEEE, and Ye Xia, Member, IEEE journal 2010.
[17] Efficient Data Gathering with Mobile Collectors and Space-Division Multiple Access Technique in Wireless Sensor Networks Miao Zhao, Student Member, IEEE, Ming Ma, and Yuanyuan Yang, Fellow, IEEE journal 2011.
[18] Analysis on Data Collection with Multiple Mobile Elements in Wireless Sensor Networks Liang He1,2, Jianping Pan1, and Jingdong Xu2 1University of Victoria, Victoria, BC, Canada 2Nankai University, Tianjin, China journal 2011.
[19] Wireless Sensor Networks F. L. LEWIS Associate Director for Research Head, Advanced Controls, Sensors, and MEMS Group Automation and Robotics Research Institute The University of Texas at Arlington 7300 Jack Newell Blvd. S Ft. Worth, Texas 76118-7115 journal 2004.