Intelligent call admission control for wideband CDMA cellular systems

Scott Shen*, Chung Ju Chang, Ching-Yao Huang, Qi Bi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


In this paper, we propose intelligent call admission control for wideband code-division multiple-access (CDMA) cellular systems to support differentiated quality-of-service (QoS) requirements, guarantee the forced termination probability of hand-offs, and maximize the spectrum utilization. The intelligent call admission controller (ICAC) contains a fuzzy call admission processor to make admission decision for a call request by considering QoS measures such as the forced termination (drop call) probability of handoff, the outage probability of all service types, the predicted next-step existing-call interference, the link gain, and the estimated equivalent interference of the call request. The pipeline recurrent neural network (PRNN) is used to accurately predict the next-step existing-call interference, and the fuzzy logic theory is applied to estimate the new/handoff call interference based on knowledge of effective bandwidth method. Simulation results indicate that ICAC achieves system capacity higher than conventional CAC schemes by an amount of more than 10% in both low and high moving speed cases. Moreover, ICAC can cope with the unpredictable statistical fluctuation of wireless multimedia traffic; it always fulfill QoS requirements for all service types and keep the forced termination probability satisfied, while the CAC of multimedia calls (MCAC) and SIR-based CAC with intercell interference prediction (PSM-CAC) fail to adapt to the variation of traffic conditions.

Original languageEnglish
Pages (from-to)1810-1821
Number of pages12
JournalIEEE Transactions on Wireless Communications
Issue number5
StatePublished - 1 Sep 2004


  • Call admission control
  • Equivalent interference
  • Fuzzy logic
  • Handoff
  • Neural network


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