Performance of a two-level call admission control scheme for DS-CDMA wireless networks

  • Authors:

  • Abraham O. Fapojuwo;Yinggan Huang

  • Affiliations:

  • Department of Electrical and Computer Engineering, The University of Calgary, Calgary, Alberta, Canada;Department of Electrical and Computer Engineering, The University of Calgary, Calgary, Alberta, Canada

  • Venue:
  • EURASIP Journal on Wireless Communications and Networking
  • Year:
  • 2007

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Abstract

We propose a two-level call admission control (CAC) scheme for direct sequence code division multiple access (DS-CDMA) wireless networks supporting multimedia traffic and evaluate its performance. The first-level admission control assigns higher priority to real-time calls (also referred to as class 0 calls) in gaining access to the system resources. The second level admits nonreal-time calls (or class 1 calls) based on the resources remaining after meeting the resource needs for real-time calls. However, to ensure some minimum level of performance for nonreal-time calls, the scheme reserves some resources for such calls. The proposed two-level CAC scheme utilizes the delay-tolerant characteristic of non-real-time calls by incorporating a queue to temporarily store those that cannot be assigned resources at the time of initial access. We analyze and evaluate the call blocking, outage probability, throughput, and average queuing delay performance of the proposed two-level CAC scheme using Markov chain theory. The analytic results are validated by simulation results. The numerical results show that the proposed two-level CAC scheme provides better performance than the single-level CAC scheme. Based on these results, it is concluded that the proposed two-level CAC scheme serves as a good solution for supporting multimedia applications in DS-CDMA wireless communication systems.