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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Shared Relay-Based Interference Management Schemes for Device-to-Device Radio Underlaying Cellular Networks

셀룰러 네트워크상의 D2D 통신을 위한 공유릴레이 기반 간섭 관리 기법

  • 양모찬 (숭실대학교 대학원 정보통신공학과) ;
  • 오선애 (숭실대학교 대학원 정보통신공학과) ;
  • 신오순 (숭실대학교 정보통신전자공학부) ;
  • 신요안 (숭실대학교 정보통신전자공학부)
  • Received : 2013.02.26
  • Accepted : 2013.03.05
  • Published : 2013.04.30
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Abstract

D2D (Device-to-Device) communication on an underlying cellular infrastructure which exploits the same spectrum has several advantages such as increased resource utilization and improved cellular coverage. However, D2D communication system needs to cope with ICI (Inter-Cell Interference) and interference between cellular and D2D links. As a result, macro UEs (User Equipments), especially those located near cell edge, will suffer from serious link performance degradation. We propose a novel interference avoidance mechanism assisted by SRN (Shared Relay Node) in this paper. SRN not only performs data re-transmission as a usual Type II relay but also has several features newly defined to avoid interference between cellular and D2D links. In particular, we suggest resource allocation methods based on the SRN for effective interference avoidance, and evaluate their performance through computer simulations.

셀룰러 인프라 구조에 기반하여 셀룰러 스펙트럼을 공유하여 사용하는 D2D (Device-to-Device) 통신은 몇 가지 장점이 있지만, 셀룰러 네트워크 사용자와 동일한 자원을 사용하므로 간섭이 생기는 큰 문제점이 있다. 특히, 다중 셀에서 셀 경계 D2D 사용자와 셀룰러 사용자 간의 간섭 문제는 셀의 중심부에서보다 훨씬 강도가 높게 발생한다. 따라서, 본 논문에서는 인접한 셀들의 중심에 위치한 SRN (Shared Relay Node)이 셀룰러 링크와 D2D 링크 사이에 발생하는 간섭을 효율적으로 관리하는 새로운 방식을 제안한다. 제안하는 SRN은 기존 Type II 릴레이와 같이 데이터 재전송 역할을 수행할 뿐만 아니라, 추가적으로 간섭 관리를 위한 기능을 수행하기 때문에 몇 가지 기능이 새롭게 정의된다. 셀룰러 링크와 D2D 링크 사이에 간섭 관리를 위한 구체적인 방법으로 본 논문에서는 셀 경계영역 사용자들의 간섭 회피를 위한 SRN 기반 자원할당 방법을 제안하고 이들의 성능을 모의실험을 통해 검증하였다.

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