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

  • 제34권8C호
  • /
  • Pages.731-741
  • /
  • 2009
  • /
  • 1226-4717(pISSN)
  • /
  • 2287-3880(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
권호 표지

W-CDMA 시스템에서 광중계기를 이용한 secondary-스크램블 코드의 효율적 활용방안에 대한 연구

Efficient Usage of Secondary Scramble Code via Optical Repeater in W-CDMA System

  • 전은성 (연세대학교 전기전자공학과 이동통신 연구실) ;
  • 박준효 (연세대학교 전기전자공학과 이동통신 연구실) ;
  • 양장훈 (연세대학교 전기전자공학과 이동통신 연구실) ;
  • 김동구 (연세대학교 전기전자공학과 이동통신 연구실)
  • 발행 : 2009.08.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

최근 셀 커버리지 증대와 음영지역 및 핫스팟(hot spot) 지역의 서비스 공급을 위해 추가적인 기지국 설치를 하지 않고 중계기를 활용하고 있다. 중계기는 기지국과 지형적으로 떨어져 있기 때문에 중계기와 기지국이 서로 다른 스크램블 코드를 사용할 때, 코드간 간섭이 줄어들 수 있다. 본 논문은 이와 같은 사실을 이용하여 중계기를 활용한 primary-secondary 스크램블 코드 활용 방안을 연구한다.. 이를 위해서 다섯 가지의 시나리오를 제시하고, 각 시나리오 별 성능을 시스템 레벨 시뮬레이션을 통해 비교한다. 이에 더하여, secondary 스크램블 코드의 미치는 간섭을 줄이고, 아웃티지(outage) 성능을 향상시키기 위해서 기지국-중계기간 스위칭(switching) 기법과 primary-secondary 스크램블 코드간 리플레이싱(replacing) 기법을 제안한다.

Optical repeater is often installed at the isolated area. Spatial separation makes it possible to reduce the inter-code interference when secondary scrambling codes are used for traffic connected through repeater. In this paper, we propose five secondary scrambling code usage scenarios with the aids of optical repeater to maximize the user capacity. In order to evaluate the performance, dynamic system level simulation is performed. We also propose a base station-repeater switching where each active users can change access points by comparing the channel condition from base station and repeater thorough secondary common pilot channel (S-CPICH) signal to noise-interference ratio (SINR). Moreover, primary-secondary scramble code replacing scheme is proposed which replaces secondary scramble code with primary scramble code when a call using primary scramble code is ended and its corresponding OVSF code is available to users using the secondary scramble code

키워드

참고문헌

  1. "IxEV-DV Evaluation Methodology-Addendum (V6)", 3GPP2 WG5 Evaluation Ad Hoc, July 25, 2001
  2. (2005) Physical Channels and Mapping of Transport Channels onto Physical Channels (FDD). 3GPP TS 25.211. [Online]. Available: http://www.3gpp.org
  3. (2005) Spreading and Modulation (FDD). 3GPP TS 25.213. [Online]. Available: http://www.3gpp.org
  4. H. Holma and A. Toskala, WCDMA for UMTS, 2nd ed., West Syssex: John Wiley & Sons, 2002
  5. Maclej J. Nawrocki, M. Dohler and A. H. Aghvami 'Understanding UMTS Radio Network : Modeling, Planning and Automated Optimisation,' John Wiley & Sons, 2006
  6. Frank Brouwer, "Performance Analysis and Allocation Strategy for the WCDMA Second Scrambling Code," LNCS 3260, pp. 389-398, 2004
  7. Hu Rong and Kimmo Hiltunen, "Performance Investigation of Secondary Scrambling Codes in WCDMA Systems," IEEE VTC-spring, vol 2, pp. 698-702, May 2006
  8. Y.Tseng, C.Cha and S.Wu, "Code Placement and Replacement Strategy for Wideband CDMA OVSF Code Tree Management," IEEE Trans. on Mobile Computing, Vol.1, No.4, Oct.-Dec. 2002, pp.293-302 https://doi.org/10.1109/TMC.2002.1175542
  9. Ramiro-Moreno. J, Pedersen K. I. and Morgensen P.E. 'Capacity Gain of Beamforming Techniquesin a WCDMA System Under Channelization Code Constraints,' IEEE Trans. Commun., Vol 3, pp.1199-1208, July 2006
  10. D.Staehle, 'On the Code and Soft Capacity of the UMTS FDD Downlink and the Capacity Increase by using a Secondary Scrambling Code,' IEEE Int. Symp. Personal Indoor and Mobile Radio Communication, 2005
  11. Mehta. N.B., Greenstein L.J., Willis. T.M. and Kostic. Z 'Analysis and Results for the Orthogonality Factor in WCDMA Downlinks,' IEEE Trans. Commun. Vol2. No. 6, Nov 2003 https://doi.org/10.1109/TWC.2003.816801
  12. Recommendation ITU-R M.1225, Guideline for Evaluation of Radio Transmission Technologies for IMT-2000, 1997
  13. R.Patachaianand and K. Sandrasegaran, 'System-Level Modeling and Simulation of Uplink WCDMA,' Proc. 5th Int. Conf. on Information Technology, pp.1071-1076, 2008
  14. S.A.Ghorashi, E. Homayounvala, F. Said and A.H. Aghvami, 'Dynamic Simulator for Studying WCDMA Based Hierarchical Cell Structures,' IEEE Int. Symp. Personal Indoor and Mobile Radio Communication, Sep. 2001.
  15. B. Goransson, B. Hagerman, S. Pertersson, 'Advanced antenna systems for WCDMA: Link and system level results',IEEE PIMRC 2000, vol. 1, pp.A.26-A.30, Sep. 2000
  16. Y.Li and Y.L.Guan, 'Modified Jake's Model for Simulating Multiple Uncorrelated Fading Waveforms,' IEEE International Conference on Communication, vol.1, pp46-49, 2000. https://doi.org/10.1109/ICC.2000.853061
  17. M. Gudmundson, 'Correlation Model for Shadow Fading in Mobile Radio Systems,' Electronics Letters, vol. 27, pp. 2145–2146, 1991 https://doi.org/10.1049/el:19911328
  18. K. Jeong, J. Cheong, T. Park, T. Kim and S. Park, 'Performance analysis of DS-CDMA reverse link with fiber-optic repeaters', in Proc. IEEE VTC-spring, May 2000
  19. W. Lee and D. Lee, 'The impact of repeaters on CDMA system performance,' in Proc. IEEE VTC-spring, May, 2000
  20. K. Hiltunen, 'Using RF Repeaters to Improve WCDMA HSDPA Coverage and Capacity Inside Buildings,' IEEE Int. Symp. Personal Indoor and Mobile Radio Communication, 2006