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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Joint Operation of ABS with Power Control and Derivation of an Effective ABS Ratio for LTE Hetnet Environments

LTE-A 이종망 환경에서 ABS와 Power Control의 동시적용과 ABS 비율 도출

  • Sung, No-Hoon (Ajou University Graduate school of Information and Communication Technology) ;
  • Choi, Young-June (Ajou University Graduate school of Information and Communication Technology) ;
  • Jang, Ji-Woong (Ulsan College, Department of Information Technology)
  • Received : 2015.07.17
  • Accepted : 2015.11.30
  • Published : 2015.12.30
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Abstract

It has been known that interference occurs between macrocell ans small-cell base stations in a heterogeneous network (HetNet) of LTE-A. For solving this problem, 3GPP suggested eICIC (Enhanced Inter Cell Interference Coordination) that includes ABS (Almost Blank Subframe) and power control. This paper proposes to use ABS with power control and derives an effective ABS ratio as a function of the number of users and HeNBs. Through simulation, we confirm that integration of ABS and power control can mitigate interference than using ABS only. Furthermore, we verify that an effective ABS ratio is different depending on the number of users and HeNBs.

LTE-A 시스템의 이기종 네트워크(Heterogeneous Network, HetNet)에서는 스몰셀과 메크로셀 기지국 간의 간섭이 존재한다. 이를 해결하기 위해 3GPP에서는 eICIC(Enhanced Inter Cell Interference Coordination)를 제안하였으며 ABS(Almost Blank Subframe)와 전력 제어 방법이 대표적으로 알려져 있다. 본 논문에서는 전력제어와 ABS 방식의 동시 적용 방안을 제안하였으며 사용자수와 소형의 기지국 수를 고려하여 효율적인 ABS 비율을 도출하였다. ABS와 전력 제어를 동시에 적용한 결과 ABS를 단독 적용한 것보다 향상된 간섭 완화 효과를 얻었으며 사용자 수와 기지국 수에 따라 효율적인 ABS 비율이 다르다는 것을 확인하였다.

Keywords

References

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