Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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User Scheduling Algorithm Based on Signal Quality and Inter-User Interference for Outage Minimization in Full-Duplex Cellular Networks

전이중 셀룰라 네트워크에서 아웃티지 최소화를 위한 신호 품질과 사용자간 간섭량 기반의 사용자 스케쥴링 알고리즘

  • Choi, Hyun-Ho (Department of Electrical, Electronic and Control Engineering, Institute for Information Technology Convergence, Hankyong National University)
  • Received : 2015.09.16
  • Accepted : 2015.10.20
  • Published : 2015.11.30
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Abstract

In a full-duplex (FD) wireless cellular network, uplink (UL) users induce the severe inter-user interference to downlink (DL) users. Therefore, a user scheduling that makes a pair of DL user and UL user to use the same radio resource simultaneously influences the system performances significantly. In this paper, we first formulate an optimization problem for user scheduling to minimize the occurrence of outage, aiming to guarantee the quality of service of users, and then we propose a suboptimal user scheduling algorithm with low complexity. The proposed scheduling algorithm is designed in a way where the DL user with a worse signal quality has a higher priority to choose its UL user that causes less interference. Simulation results show that the FD system using the proposed user scheduling algorithm achieves the optimal performance and significantly decreases the outage probability compared with the conventional half-duplex cellular system.

전이중(full-duplex) 셀룰라 네트워크에서 상향링크 사용자는 하향링크 사용자에게 간섭을 유발하므로 같은 무선 자원을 동시에 사용하는 상 하향링크 사용자 쌍을 어떻게 결정하는 지가 시스템 성능에 큰 영향을 미친다. 본 논문에서는 사용자의 서비스의 질을 보장하기 위한 목적으로 아웃티지(outage) 발생의 최소화를 위한 최적화 문제를 제시하고, 낮은 복잡도를 갖는 차선의 사용자 스케쥴링 알고리즘을 제안한다. 제안하는 스케쥴링 방식은 나쁜 신호 품질을 갖는 하향링크 사용자에게 간섭을 덜 미치는 상향링크 사용자를 먼저 선택할 수 있도록 우선권을 주는 방식으로 동작한다. 시뮬레이션 결과 제안하는 사용자 스케쥴링 방식을 사용하는 전이중 시스템은 최적에 가까운 아웃티지 성능을 달성하면서 기존 반이중 모드의 셀룰라 시스템 대비 아웃티지 발생을 현저히 줄인다.

Keywords

References

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