A Hierarchical Preamble Design Technique for Efficient Handovers in OFDM-Based Multi-Hop Relay Systems

Hyun-Il YOO
Young-Jun KIM
Kyung-Soo WOO
Jaekwon KIM
Sangboh YUN
Yong-Soo CHO

IEICE TRANSACTIONS on Communications   Vol.E92-B    No.12    pp.3907-3910
Publication Date: 2009/12/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.3907
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Transmission Systems and Transmission Equipment for Communications
multi-hop relays,  handover,  OFDM,  hierarchical preamble,  

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In this paper, a new handover procedure for OFDM-based multi-hop relay systems is proposed to reduce handover overhead by distinguishing an inter-cell handover event from an intra-cell handover event at the level of the physical layer using a preamble with a hierarchical design. A Subcell ID concept used to identify relay station in a cell is proposed in the hierarchical design that works in conjunction with the existing Cell ID used to identify base station. The proposed handover procedure can simplify the scanning procedure and skip/simplify the network re-entry procedure, resulting in a significant reduction in handover overhead.