3GPP LTE-Advanced 네트워크에서 다중셀 공유 릴레이를 이용한 셀간 간섭 관리 기술
ICI Management Scheme Using Multi-cell Shared Relay Node in 3GPP LTE-Advanced Networks
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초록
본 논문은 3GPP LTE(3rd Generation Partnership Project Long Term Evolution)-Advanced 네트워크에서셀간 간섭을 회피하고 셀 용량을 높이기 위한 다중셀 공유 릴레이(Shared Relay Node; SRN) 기반의 셀간 간섭 관리기술을 제안한다. 현재 3GPP LTE-Advanced 네트워크에서 셀간 간섭을 극복하기 위한 후보 기술로 논의되고 있는다중셀 협력 전송 기술(CoMP: Coordinated Multi-Point Transmission/reception)은 채널 정보 수집과 백홀을 통한 전송 과정에서 발생하는 지연시간 때문에 채널 추정 오류가 발생하고 이로 인해 성능이 크게 저하되는 문제점이 있다. 따라서 본 논문에서는 인접한 셀들의 중심에 위치한 SRN이 셀간 간섭을 효율적으로 관리하는 새로운 방식을 제안한다. 제안하는 SRN은 인접한 eNB(enhanced Node-B)와 UE(User Equipment)가 전송하는 제어신호를Overhearing 함으로써 기존 Type II 릴레이와 같이 데이터 재전송 역할을 수행할 뿐만 아니라 추가적으로 셀간 간섭관리 기능을 수행한다. 또한 셀간 간섭 관리를 위한 구체적인 방법으로 본 논문에서는 셀 경계 영역 사용자들의 간섭회피를 위한 SRN 기반의 자원 할당 기법과 전력제어 기법을 제안하고 이들의 성능을 모의시험을 통해 검증한다
Abstract
In this paper, we propose an inter-cell interference management scheme using multi-cell SRN (Shared Relay Node), in order to avoid the inter-cell interference and to increase the cell throughput in 3GPP LTE (3rd Generation Partnership Project Long Term Evolution)-Advanced networks. Recently, CoMP (Coordinated Multi-Point transmission/reception) scheme has received growing attention as a promising technique for overcoming the inter-cell interference in 3GPP LTE-Advanced networks. In practice, however, when feedback delays and channel estimation errors are considered, the performance of CoMP scheme may severely degrade. The objective of this paper is to present a new SRN architecture located at the neighboring area of adjacent cells so as to manage the inter-cell interference. The SRN can overhear control signals transmitted by adjacent eNBs and UEs. Based on the overheard information, the SRN not only performs data re-transmission as a usual Type II relay, but also manages the inter-cell interference. In particular, we suggest a resource allocation scheme and a power control scheme based on the SRN for effective interference avoidance, and evaluate their performances through simulations.
참고문헌 (22)
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