다중홉 릴레이 기반 셀룰러 OFDMA-TDD 시스템에서의 선택적 협력 전송 기법
Selective Cooperative Relay Scheme for the Multi-hop Relay-enhanced Cellular OFDMA-TDD System
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CTD는 다이버시티 경로를 위한 추가적인 자원 할당이 오버헤드의 요인이 되며 CRD는 자원의추가적인 할당은 없으나 MS가 MR-BS→RS 구간을엿듣도록 하기 위해 별도의 시그널링으로 인한 오버헤드가 존재한다. 한편 각 방식 별로 결합 이득에 따라CINR 값이 결정되고 이 값에 따라 지원 가능한 전송률이 정해진다. 이때 결합 이득은 단말의 위치와 채널 상1031 Telecommunications Review · 제17권 6호 · 2007년 12월MS1 MS3
Abstract
This paper first investigates the various types of cooperative transmission protocols that can be applicable to multi-hop relay-enhanced cellular broadband mobile access networks, and furthermore, studies the system-level performance characteristics for practical deployment. Cooperative communication turns out to be useful for improving the service outage performance subject to aggressive frequency reuse in the relay-enhanced cellular network. Depending on the position of mobile stations in the multi-hop relay system, various types of cooperative relaying schemes show the different level of throughput and outage performance, due to their inherent trade-off between diversity gain and overhead associated with cooperation. In order to improve both throughput and outage performance at the same time, we propose a unified selection criterion to deal with the different level of combining gain and overhead associated with each scheme, which allows for employing the different cooperative relaying scheme in the varying position of mobile station. Our system-level simulation results for IEEE 802.16j multi-hop relay confirm the varying level of trade-off among the different cooperative relaying schemes and show that the overall system performance can be improved with the proposed selective approach.