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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Power-Saving Mechanism Considering Round-Trip Delay in LTE Systems

LTE 시스템에서 양방향 지연을 고려한 전력절감 방식

  • 최현호 (국립한경대학교 전기전자제어공학과)
  • Received : 2013.10.14
  • Accepted : 2013.12.10
  • Published : 2013.12.31
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Abstract

In this paper, we propose a new power-saving mechanism (PSM) for Long-Term Evolution (LTE) systems by considering a round-trip delay between a user equipment (UE) and its correspondence node. The proposed PSM changes the order of the operational procedures of the legacy LTE PSM by taking the traffic arrival pattern suffering the round-trip delay into account. After modeling the round-trip delay, we numerically analyze the proposed PSM with respect to energy consumption and buffering delay. Then, we characterize these performances by employing a simple energy-delay tradeoff (EDT) curve according to the operational parameters. The resulting EDT curve clearly shows that the proposed PSM outperforms the legacy LTE PSM in terms of both the energy consumption and buffering delay.

본 논문에서는 Long-Term Evolution (LTE) 시스템에서 사용자 단말과 통신하는 상대노드 사이에 발생하는 양방향 지연을 고려하여 새로운 전력절감 알고리즘을 제안한다. 제안하는 전력절감 알고리즘은 양방향 지연을 겪는 트래픽 발생 패턴에 맞추어 기존 LTE 시스템의 전력절감 알고리즘에서 사용하는 단말 상태 천이 순서를 반대로 적용한다. 발생하는 양방향 지연을 수학적으로 모델링한 후 제안 전력절감 방식의 성능을 단말의 에너지 소비량과 패킷의 버퍼링 지연 관점에서 분석한다. 운용 파라미터의 변화에 따라 이들 성능을 에너지-지연 트레이드오프 곡선으로 특성화하고 이를 통해 제안하는 전력절감 방식이 기존 LTE 표준의 전력절감 방식과 비교하여 에너지와 지연 성능 모두를 효과적으로 향상시키고 있음을 확인한다.

Keywords

References

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