Downlink admission control strategies for CDMA systems in a Manhattan environment

Jens Knutsson, Peter Butovitsch, Magnus Persson, Roy D. Yates

Research output: Contribution to journalConference articlepeer-review

50 Scopus citations


Downlink admission control strategies and downlink power control strategies, for CDMA systems in a Manhattan environment, are investigated by simulation experiments. Different admission policies are compared by investigating system capacity versus grade of annoyance, defined as a weighted combination of call blocking and call dropping probabilities, or by just viewing the call dropping probabilities. The admission decision is based on output power levels from base stations (BSs) and the investigation focuses on whether the admission decision should be based on measurements from one BS or measurements from several BSs. Simulations indicate that the admission algorithms do not gain much from using information from more than one cell. However, using information from more than one cell decreases the call dropping probability for very high loads. Further, the performances of the proposed downlink algorithms are not as good as for some previously studied uplink admission control algorithms. Finally, having a maximum output power constraint on a BS basis instead of on a channel basis decreases the call dropping probability.

Original languageEnglish (US)
Pages (from-to)1453-1457
Number of pages5
JournalIEEE Vehicular Technology Conference
StatePublished - Dec 1 1998
Externally publishedYes
EventProceedings of the 1998 48th IEEE Vehicular Technology Conference, VTC'98. Part 2 (of 3) - Ottawa, Can
Duration: May 18 1998May 21 1998

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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