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Downlink Capacity Analysis of Collaborative Crossed Timeslots in CDMA TDD Systems

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Abstract

Traffic asymmetry between uplink and downlink is expected to be a remarkable 3G characteristic in cellular mobile multimedia communications. CDMA system with TDD is a good solution to this traffic asymmetry. However, the level of traffic asymmetry may be significantly different from a cell to another cell. To tackle this problem and to support the traffic hot spot, crossed slots are examined. The use of crossed slots is restricted within a certain range of a cell by investigating the inter-cell interference and the maximum planned load factor. We examine the radius of inner zone and discuss the capacity of downlink crossed slots for various neighbor cell environments. Computational results show that the capacity increase in the target cell is outstanding by reducing the service range of neighbor cells. When all six neighbors reduce their service range by 20%, the capacity at target cell crossed slot is increased by 35%. Monte Carlo simulation is performed with large scale fading to verify the numerical analysis.

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References

  1. Nasreddine, J., & Lagrange, X. (2003). Time slot allocation based on a path gain division scheme for TD-CDMA TDD systems. In IEEE Vehicular Technology Conference (VTC), Spring, 2003.

  2. Jeon W.S. and Jeong D.G. (2000). Comparison of time slot allocation strategies for CDMA/TDD Systems. IEEE Journal on Selected Areas in Communications 18(7): 1271–1278

    Article  Google Scholar 

  3. Wu, X., Yang, L. L., & Hanzo, L. (2002). Uplink capacity investigations of TDD/CDMA. In IEEE Vehicular Technology Conference (VTC), Spring, 2002.

  4. Wang, L. C., Huang, S. Y., & Tseng, Y. C. (2003). Interference analysis of TDD-CDMA systems with directional antennas. In IEEE Vehicular Technology Conference (VTC) (pp. 1369–1373), Fall, 2003.

  5. Ni, S., & Hanzo, L. (2005). Genetically enhanced performance of a UTRA-like time-division duplex CDMA network. In IEEE Vehicular Technology Conference, Spring, 2005.

  6. Blogh J.S., & Hanzo, L. (2002). Third-generation systems and intelligent wireless networking—smart antennas and adaptive modulation. Wiley and IEEE Press.

  7. Ni, S., Blogh, J. S., & Hanzo, L. (2003). On the network performance of UTRA-like TDD and FDD CDMA systems using adaptive modulation and adaptive beamforming. In Proceedings of the IEEE Vehicular Technology Conference (pp. 606–610), Spring, April, 2003.

  8. Godara L.C. (1997). Application of antenna arrays to mobile communications, part 2: Beam-forming and direction-of-arrival considerations. Proceedings of the IEEE 85: 1195–1245

    Article  Google Scholar 

  9. Nazzarri, F., & Ormondroyd, R. F. (2002). An effective dynamic slot allocation strategy based on zone division in WCDMA/TDD systems. In IEEE Vehicular Technology Conference, Fall, 2002.

  10. Lee, J., Han, Y., & Kwon, D. (2001). An adaptive time slot allocation strategy for W-CDMA/TDD system. In IEEE Vehicular Technology Conference, Spring, 2001.

  11. Haardt, M., Klein, A., Koehn, R., Oestreich, S., Purat, M., Sommer, V., & Ulrich, T. (2000). The TD-CDMA based UTRA TDD mode. IEEE Journal on Selected Areas in Communications, 18(8).

  12. Holma H. and Toskala A. (2004). WCDMA for UMTS (3rd ed.). Wiley, London

    Google Scholar 

  13. Sipilä, K., Honkasalo, Z. C., Laiho-Steffens, J., & Wacker, A. (2000). Estimation of capacity and required transmission power of WCDMA downlink based on a downlink pole equation. In IEEE Vehicular Technology Conference.

  14. Czezowski P.J., Morawej A. and McLeod R.D. (1999). GPS assisted resource allocation in mobile networks. Society for Computer Simulation 31(4): 153–156

    Google Scholar 

  15. Son, H. C., Lee, J. G., & Jee, G. I. (2003). Mobile station location using hybrid GPS and a wireless network. In IEEE Vehicular Technology Conference (pp. 2716–2720).

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Authors and Affiliations

  1. Department of Industrial Engineering, KAIST, 373-1 Kusung Dong, Taejon, South Korea

    Ki Won Sung, Chae Y. Lee & Kwang Hyuk Yim

  2. Department of Telecommunications, Services and Uses, INSA, Lyon, France

    Agnes Gravrand

Authors
  1. Ki Won Sung
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  2. Chae Y. Lee
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  3. Kwang Hyuk Yim
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  4. Agnes Gravrand
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Correspondence to Chae Y. Lee.

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Sung, K.W., Lee, C.Y., Yim, K.H. et al. Downlink Capacity Analysis of Collaborative Crossed Timeslots in CDMA TDD Systems. Wireless Pers Commun 50, 469–481 (2009). https://doi.org/10.1007/s11277-008-9618-7

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  • DOI: https://doi.org/10.1007/s11277-008-9618-7

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