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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Effective Frequency Reuse Scheme for OFDMA Cellular Multihop Networks for Improving Cell Throughput with Low Outage Ratio

OFDMA 셀룰러 다중홉 네트워크에서 셀 용량을 증가시키는 효율적인 주파수 재활용 방법

  • 임성국 (연세대학교 전기전자공학과 유비쿼터스 연구실) ;
  • 전한얼 (연세대학교 전기전자공학과 유비쿼터스 연구실) ;
  • 이재용 (연세대학교 전기전자공학과 유비쿼터스 연구실)
  • Received : 2010.11.23
  • Accepted : 2010.12.10
  • Published : 2010.12.31
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Abstract

Recently smart phone and tablet PC are regarded as the most valuable mobile devices, so the demand of customers for multimedia supporting has been greatly increased. The network operators are now considering the deployment of relay stations ensuring low installation costs for its service cell to improve the cell capacity. Enhancing the relay stations, however, increases intra-cell interference, which is affecting the quality of service and outage ratio. In this paper, we present MPFR(Multihop Partial Frequency reuse) as the new frequency reuse scheme to increase cell throughput while maintaining low outage ratio for the OFDMA cellular multihop networks. Dynamic power control is also introduced to improve cell capacity. Overall cell throughput and outage ratio are observed by the simulation, and comparison between MPFR and conventional multihop frequency reuse schemes is convincing the performance enhancement.

최근 스마트폰 및 타블릿 PC가 차세대 통신단말롤 급부상함에 따라 멀티미디어 서비스에 대한 사용자의 요구 또한 급격히 증가하였다. 기존의 통신네트워크사업자는 셀 용량의 증설을 위해 값이 저렴한 중계기의 도입을 적극 검토하고 있다. 그러나 중계기의 도입은 셀 내의 간섭을 심화시키고 이는 사용자 서비스 품질에 악영향을 미치며 서비스 불능(outage) 비율을 증가시키게 된다. 본 논문에서는 중계기를 사용하는 다중흡 셀룰러 네트워크에서 OFDMA에 적합한 효율적인 주파수 재활용 방법을 제안하여 서비스 불능 확률을 감소시키면서 동시에 데이터 수율을 증가시키고자 한다. 또한 동적 전력제어를 통해 추가적인 성능향상을 보장하며, 셀 전체의 데이터 수율과 서비스 불능 비율의 비교를 통해 성능을 검증한다.

Keywords

Acknowledgement

Supported by : 정보통신산업진흥원

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