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A Hierarchical Preamble Design Technique for Efficient Handover in OFDM-based Multi-hop Relay Systems  

Yoo, Hyun-Il (중앙대학교 디지털통신 연구실)
Kim, Yeong-Jun (중앙대학교 디지털통신 연구실)
Woo, Kyung-Soo (중앙대학교 디지털통신 연구실)
Kim, Jae-Kwon (연세대학교 원주캠퍼스 컴퓨터정보통신공학부)
Yun, Sang-Boh (삼성전자 정보통신연구소)
Cho, Yong-Soo (중앙대학교 디지털통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.4A, 2008 , pp. 342-351 More about this Journal
Abstract
In this paper, a new handover procedure for OFDM-based multi-hop relay systems is proposed to reduce the handover overhead by distinguishing inter-cell handover event from intra-cell handover event at the level of physical layer using a hierarchical design concept of preamble. A Subcell ID concept for identifying RS in a cell is proposed in the design of hierarchical manner, in addition to the existing Cell ID for identifying BS. The decision on either inter-cell handover or intra-cell handover is made by the signal quality measure of CBINR(Carrier of BS to Interference and Noise Ratio) and CRINR(Carrier of RS to Interference and Noise Ratio), provided by the hierarchical preamble. The proposed handover procedure can simplify scanning procedure and skip/simplify network re-entry procedure (capability negotiation, authorization, registration), resulting in a significant reduction of handover overhead.
Keywords
Multi-hop Relays; OFDM; Hierarchical Preamble; Handover;
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