VE-mobicast: a variant-egg-based mobicast routing protocol for sensornets

In this paper, we present a new “spatiotemporal multicast”, called a “mobicast”, protocol for supporting applications which require spatiotemporal coordination in sensornets. The spatiotemporal character of a mobicast is to forward a mobicast message to all sensor nodes that will be present at time t in some geographic zone (called the forwarding zone) Z, where both the location and shape of the forwarding zone are a function of time over some interval (t _start ,t _end ). The mobicast is constructed of a series of forwarding zones over different intervals (t _start ,t _end ), and only sensor nodes located in the forwarding zone in the time interval (t _start ,t _end ) should be awake in order to save power and extend the network lifetime. Existing protocols for a spatiotemporal variant of a multicast system were designed to support a forwarding zone that moves at a constant velocity, , in sensornets. To consider the path of a mobile entity which includes turns, this work mainly develops a new mobicast routing protocol, called the variant-egg-based mobicast (VE-mobicast) routing protocol, by utilizing the adaptive variant-egg shape of the forwarding zone to achieve high predictive accuracy. To illustrate the performance achievement, a mathematical analysis is conducted and simulation results are examined. Yuh-Shyan Chen received the M.S. and Ph.D. degrees in Computer Science and Information Engineering from the National Central University, Taiwan, Republic of China, in June 1991 and Jan. 1996, respectively. He joined the faculty of Department of CSIE, Chung-Hua University, Taiwan, in 1996. He joined the Department of Statistic, National Taipei University in Aug. 2000, and joined the Department of CSIE, National Chung Cheng University in Aug. 2002. Dr. Chen is an associate Professor from Aug. 2003. Since 2006, he has been a Professor at the Department of CSIE, National Taipei University, Taiwan. Dr. Chen served as Co-Editors-in-Chief of International Journal of Ad Hoc and Ubiquitous Computing (IJAHUC); Editorial Board Member of Telecommunication System; Guest Editor of Telecommunication Systems, special issue on “Wireless Sensor Networks” (2004). He was a Vice Co-Chair, Wireless IP Symposium of WirelressCOM, USA (2005); Workshop Co-Chair, IEEE AHUC06, Taiwan (2006); Program Co-Chairs, IFIP NCUS06, Korea (2006). Dr. Chen also served as Program Committee Member of ICPP’03, ICDCS’04, ICCCN’01–06, MSN’05, CCN’02–06, CSA’04 06, NCS’06, MSEAT’03–06, WASN06, USN06, MHNET06, PESYS06, ML06, IWWN06, UIC06, ICWMC06, and HWN-RMQ06; IASTED Technical Committee on Telecommunications (2002–2005); WSEAS International Scientific Committee Member (from 2004). His paper wins the 2001 IEEE 15th ICOIN-15 Best Paper Award. Dr. Chen was a recipient of the 2005 Young Scholar Research Award given by National Chung Cheng University to four young faculty members, 2005. His recent research topics include mobile ad-hoc network, wireless sensor network, and 4G system. Dr. Chen is a member of the IEEE Computer Society and Phi Tau Phi Society. Shin-Yi Ann received the B.S. degree in computer science and engineering from the National Taiwan Ocean University, Taiwan, Republic of China, in June 2002 and the M.S. degree in computer science and information engineering from National Chung Cheng University, Taiwan, Republic of China, in July 2004. His research interest includes wireless sensor network. Yun-Wei Lin received the B.S. degree in computer and information science from the Aletheia University, Taiwan, Republic of China, in June 2003 and the M.S. degree in computer science and information engineering from National Chung Cheng University, Taiwan, Republic of China, in July 2005. His research interests include mobile ad hoc network and wireless sensor network.