• Title/Summary/Keyword: Secondary Scramble Code

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Efficient Usage of Secondary Scramble Code via Optical Repeater in W-CDMA System (W-CDMA 시스템에서 광중계기를 이용한 secondary-스크램블 코드의 효율적 활용방안에 대한 연구)

  • Jeon, Eun-Sung;Park, Jun-Hyo;Yang, Jang-Hoon;Kim, Dong-Ku
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.8C
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    • pp.731-741
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    • 2009
  • 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