Title: A preemptive dynamic bandwidth reallocation algorithm for group handover in IEEE 802.16j-enabled vehicular networks

Authors: Lianhai Shan, Fuqiang Liu, Kun Yang, Yumin Wu, Yusheng Ji

Addresses: Room 760, Communication Engineer Dept., School of Electronics and Information Engineering, Tongji University, 201804, P.R. China. ' Room 760, Communication Engineer Dept., School of Electronics and Information Engineering, Tongji University, 201804, P.R. China. ' School of Computer Science and Electronic Engineering (CSEE), University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ, UK. ' School of Computer Science and Electronic Engineering (CSEE), University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ, UK. ' Room 1503, National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan

Abstract: Current researches on vehicular networks usually assume one hop between roadside infrastructure such as a base station (BS) and a vehicle. Less research has concerned about a common scenario where there is another layer of nodes between a BS and a vehicle, i.e., a mobile relay station (MRS). This paper proposes to utilise IEEE 802.16j as an enabling technology, which supports multi-hop relaying services, to implement a vehicular network with particular focus on group handover (GHO), i.e., a group of MS is handed over to a new BS at the same time. A preemptive dynamic bandwidth reallocation algorithm that is able to borrow subchannels from other services is proposed for GHO. A Markov chain model is devised to evaluate the overall performance of the algorithm. The evaluation results have shown that the proposed algorithm leads to lower handover blocking probability and less latency than multiple single handovers.

Keywords: vehicular networks; IEEE 802.16j; mobile relay stations; MRS; group handover; GHO; single handover; SHO; dynamic bandwidth reallocation; subchannel borrowing; vehicle communications.

DOI: 10.1504/IJUWBCS.2010.031817

International Journal of Ultra Wideband Communications and Systems, 2010 Vol.1 No.3, pp.181 - 195

Published online: 24 Feb 2010 *

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