The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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A Cell Selection Technique Considering MIMO Precoding

MIMO 프리코딩을 고려한 셀 탐색 기법

  • Kim, Han Seong (School of Electric & Electronic Engineering, Chung-Ang University) ;
  • Hong, Tae Howan (School of Electric & Electronic Engineering, Chung-Ang University) ;
  • Cho, Yong Soo (School of Electric & Electronic Engineering, Chung-Ang University)
  • Received : 2012.09.12
  • Accepted : 2012.11.30
  • Published : 2012.12.28
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Abstract

In the CS/CB(Coordinated Scheduling/Beamforming) scheme, the cell edge user throughput is increased by selecting MIMO (Multiple Input Multiple Output) precoders which can minimize the interferences from adjacent base stations (BSs). However, in current LTE(Long Term Evolution) systems, the serving cell is selected in the initialization stage by using the synchronization signals and cell specific reference signals transmitted by adjacent BSs with a single antenna. The selected BS in the initialization stage may not be the best one since the MIMO precoding gain has not been considered in the cell selection stage. In this paper, a new cell selection technique is proposed for LTE systems with MIMO precoder by taking into account the effect of the precoder in the initialization stage. The proposed technique enables a user equipment (UE) in the cell boundary to select the serving BS by using the information (channel rank, effective channel capacity, and effective SINR(Signal to Interference plus Noise Ratio)) acquired from cell specific reference signals of candidate BSs. It is verified by computer simulation that the proposed technique can increase the channel capacity significantly in the multi-cell environments, compared with the conventional CS/CB scheme.

CS/CB(Coordinated Scheduling/Beamforming) 방식은 인접 기지국으로부터의 간섭신호를 최소화시키는 MIMO(Multiple Input Multiple Output) 프리코더를 선택함으로써 셀 경계 사용자의 수율을 증가시킨다. 그러나 현재의 LTE(Long Term Evolution) 시스템에서는 안테나 한 개를 사용하여 주위 기지국으로부터 전송된 동기신호와 기준신호를 사용하여 초기화 단계에서 서빙 셀이 선택된다. 이와 같이 선택된 셀은 초기화 단계에서 MIMO 프리코더 이득을 고려하지 않고 선택되었기 때문에 데이터 전송시 최적의 선택이 아닐 수 있다. 본 논문에서는 MIMO 프리코더를 갖는 LTE 시스템을 위하여 초기화 단계에서 프리코더의 영향을 고려하여 셀을 선택하는 기법을 제안한다. 제안된 기법은 후보 기지국들에서 전송한 기준신호를 사용하여 획득한 정보(랭크, 유효 채널 용량, 유효 SINR(Signal to Interference plus Noise Ratio))를 사용하여 셀 경계의 단말이 서빙 기지국을 선택할 수 있도록 한다. 제안한 기법은 기존의 기법과 비교하여 다중 셀 환경하의 LTE 시스템에서 채널 용량을 크게 향상시킬 수 있음을 모의실험을 통하여 확인한다.

Keywords

Acknowledgement

Supported by : 정보통신산업진흥원, 한국연구재단

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