Effects of Non-Uniform Traffic Distribution on the Capacity of Reverse Link CDMA System

  • Published : 2000.12.01

Abstract

In this paper, we analyzed the other-cell interference characteristics for various non-uniform traffic distributions and their effects on the capacity of multi-cell CDMA system. We consider three different traffic distributions, i.e., linear, exponential and Gaussian traffic distribution with distribution parameters. Changing the distribution parameter, we can obtain the center-focused distributions or uniform distributions for each model. From the results of other-cell interference calculation we can see that the other-cell interference decreases, as the user concentrates on the base station. Also using frequency reuse efficiency indicating the capacity reduction of a multi-cell system when compared to a single cell system, we evaluate the effect of traffic distribution on the reverse link CDMA capacity. For linear case, the capacity of multi-cell system is reduced to 0.637∼0.867 times that of single cell system. On the other hand, for both exponential and Gaussian cases, the capacity under a multi-cell environment is equal to 70∼100% of that under a single cell. Therefore, we conclude that the average capacity of multi-cell CDMA system are increased when users are likely to be at near the cell base station due to reduced total other-cell interference and decreased when users exist at near the cell edge regardless of traffic distribution models.

Keywords

References

  1. IEEE J. Select. Areas Commun. v.11 Erlang capacity of a power controlloed CDMA system A.M.Viterbi;A.J.Viterbi
  2. IEEE Trans. Commun. v.COM-40 On the Capacity of a Cellular CDMA System K.S.Gilhouse;J.M.Jacob;R.Padovani;A.J.Viterbi;L.A.Weaver;C.E.WheatlyIII
  3. CDMA systems engineering handbook J.S.Lee;L.E.Miller
  4. Proc. IEEE ICUP'97 Effect of mobile distributions on performance of a cellular CDMA systems R.Ganesh;K.Joseph
  5. IEEE Trans. VT v.42 CDMA cellular engineering issues K.I.Kim