Packet service in UMTS: effects of the radio interface parameters on the performance of the downlink shared channel

  • Flamini Borgonovo
  • Antonio Capone
  • Matteo Cesana
  • Luigi Fratta


The UMTS W-CDMA radio interface is characterized by great flexibility and a variety of different physical and logical channel types. For example, on the downlink, the DCH offers circuit switching, the FACH uses packet switching and the DSCH uses packet switching with closed loop power control. Furthermore, several user rates and protections are possible, by choosing suitable parameters, such as spreading factors, code rates and ARQ schemes. In this paper we present the results, obtained by a detailed simulation, about the effect of several parameters and system alternatives on the capacity of the downlink segment of the W-CDMA interface with packet service. In particular, we investigate the effect of the spreading factor and the code rate on the DSCH capacity and delay-throughput performance.


Power Control Code Rate Spreading Factor Universal Mobile Telecommunication System Radio Interface 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    A. Samukic, UMTS universal mobile telecommunications system: development of standards for the third generation, IEEE Transactions on Vehicular Technology, vol. 47, no. 4, Nov. 1998, pp. 1099–1104.CrossRefGoogle Scholar
  2. [2]
    K.W. Richardson, UMTS overview, Electronics & Communication Engineering Journal, vol. 12, no. 3, June 2000, pp. 93–100.CrossRefGoogle Scholar
  3. [3]
    A.M. Viterbi, A.J. Viterbi, Erlang capacity of a power controlled CDMA system, IEEE Journal on Selected Areas in Communications, vol. 11, no. 6, Aug. 1993, pp. 892–900.CrossRefGoogle Scholar
  4. [4]
    J. Y. N. Hui, Throughput analysis for Code Division Multiple Access of the Spread Spectrum Channel, IEEE Journal on Selected Areas in Communications, vol. 2, no. 4, July 1984.Google Scholar
  5. [5]
    R.J. McEliece, W.E. Stark, Channels with block interference, IEEE Trans. on Information Theory, Vol. 30, No. 1, January 1984.Google Scholar
  6. [6]
    F. Borgonovo, A. Capone, L. Fratta, Retransmissions Versus FEC Plus Interleaving for Real-Time Applications: A Comparison Between CDPA and MC-TDMA Cellular Systems, IEEE Journal on Selected Areas in Communications, vol. 17, no. 11, Nov. 1999.Google Scholar
  7. [7]
    UMTS 30.03, Annex B: Test environments and deployment models, TR 101 1112 v.3. 2. 0, April 1998.Google Scholar
  8. [8]
    rd Generation Partnership Project, RLC Protocol Specification, 3G TS 25. 322, December 2001.Google Scholar
  9. [9]
    rd Generation Partnership Project, MAC protocol specification, 3G TS 25. 321, December 2001.Google Scholar
  10. [10]
    A. Bellini, M. Ferrari, Personal communication, Politecnico di Milano, 2000.Google Scholar
  11. [11]
    rd Generation Partnership Project, RF system scenarios, 3G TR. 25. 942, December 2001.Google Scholar
  12. [12]
    rd Generation Partnership Project, Physical channels and mapping of transport channels onto physical channels (FDD), 3G TS 25. 211, December 2001.Google Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2002

Authors and Affiliations

  • Flamini Borgonovo
    • 1
  • Antonio Capone
    • 1
  • Matteo Cesana
    • 1
  • Luigi Fratta
    • 1
  1. 1.DEIPolitecnico di MilanoItaly

Personalised recommendations