Journal of Advanced Navigation Technology (한국항행학회논문지)

The Korean Navigation Institute (한국항행학회)
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Distributed Subchannel ON/OFF Scheduling by using Load Distribution for Cellular Femto Systems

셀룰러 펨토 시스템에서 부하 분산을 통한 분산적 부채널 ON/OFF 스케쥴링 기법

  • Yoon, Kang-Jin (Department of Electrical and Electronics Eng., Yonsei University) ;
  • Kim, Young-Yong (Department of Electrical and Electronics Eng., Yonsei University)
  • 윤강진 (연세대학교 전기전자공학과) ;
  • 김영용 (연세대학교 전기전자공학과)
  • Received : 2012.05.25
  • Accepted : 2012.06.30
  • Published : 2012.06.30
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Abstract

In cellular femto systems, femto Base stations(f-BSs) can be installed unnecessarily and overcrowded in small areas. This will cause an interference problem and it can impact on the capacity, blocking probability, and coverage of femtocells in the shared channel systems. In this paper, we propose a load distribution scheme by using forced handover and probabilistic subchannel scheduling policy to resolve the problem. The proposed scheme operates in distributed manner though communication with neighboring f-BSs, and includes self-detection of overcrowded area and radio resource management based on measurements. We evaluate the performance of the proposed scheme in terms of average cell throughput and average throughput per users.

셀룰러 펨토 시스템에서 펨토 기지국(f-BS: femto base station)은 좁은 영역에 중복 설치 및 과밀 설치될 수 있다. 이러한 불필요한 설치는 채널을 공유하는 인접 f-BS간 간섭문제를 야기하여서 시스템의 용량과 커버리지에 영향을 미칠 수 있다. 본 논문은 셀룰러 펨토 시스템에서 발생할 수 있는 이러한 성능하락 문제를 해결하기 위하여 강제 핸드오버를 이용한 부하분산과 확률적 자원 이용방법을 제시한다. 제안하는 기법은 중앙 컨트롤러의 조정이 아닌 이웃 f-BS간의 통신을 통한 분산적인 방법이며, f-BS가 주변 정보를 수집하여 스스로 과밀지역에 분포하였음을 인식하고 부하 및 자원 이용의 조절하는 방법을 포함한다. 평균 셀 수율, 사용자당 평균 수율을 바탕으로 제안하는 기법의 성능 향상을 모의실험을 통해 검증하였다.

Keywords

References

  1. D. Lopez-Perez, A. Valcarce, G. de la Roche, and Zhang Jie, "OFDMA femtocells: A roadmap on inter ference avoidance," IEEE Communications Mag., vol.47, no.9, pp.41-48, September 2009.
  2. V. Chandrasekhar and J. G. Andrews, "Femtocell netw orks: A survey," IEEE Commun. Mag., vol. 46, no. 9, Sept. 2008, pp. 59-67. https://doi.org/10.1109/MCOM.2008.4623708
  3. H. Claussen, L.T.W. Ho, and L.G. Samuel, "Self-optimization of coverage for femtocell deployments," Wireless Telecommunications Symposium, pp.278-285, 24-26 April 2008.
  4. H. Zeng, C. Zhu, and W.-P. Chen, "System performance of self-organizing network algorithm in WiMAX femtocells," in Proceedings of the 4th Annual Intern ational Conference on Wireless Internet, ICST, Brussels, Belgium, 2008, pp. 25:1-25:9.
  5. Chiao Lee, Jane-Hwa Huang, and Li-Chun Wang, "Distributed channel selection principles for femtocells with two-tier interference," IEEE Vehicular Technology Conference (VTC 2010-Spring), pp.1-5, 16-19 May 2010.
  6. L.G.U. Garcia, I.Z. Kovacs, K.I. Pedersen, G.W.O Costa, and P.E. Mogensen, "Autonomous component carrier selection for 4G femtocells - A fresh look at an old problem," IEEE Journal on Selected Areas in Communications, vol.30, no.3, pp.525-537, April 2012. https://doi.org/10.1109/JSAC.2012.120403
  7. A. Golaup, M. Mustapha, and L.B. Patanapongpibul, "Femtocell access control strategy in UMTS and LTE," IEEE Communications Magazine, vol.47, no.9, pp.117-123, September 2009.
  8. 3GPP TS 36.300 V10.7.0, "Evolved universal terrestria l radio access (E-UTRA) and evolved universal terrestrial radio access network (E-UTRAN); overall description; stage 2," Mar. 2012.
  9. 3GPP TS 36.423 V11.0.0 "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 applicati on protocol (X2AP)," Mar. 2012.
  10. M. Kaneko, P. Popovski, and J. Dahl, "Proportional fairness in multi-carrier system: Upper bound and approximation algorithms," IEEE Communication Letters, vol. 10, no. 6, June 2006.
  11. IEEE 802.16m-08/004r5, IEEE 802.16m Evaluation Methodology Document (EMD).