Call admission control in mobile cellular CDMA systems using fuzzy associative memory

Rupenaguntla Naga Satish Chandra, Dilip Sarkar

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


In a mobile cellular system Quality of Service (QoS) to mobile terminals (MTs) is measured by the Probability of Forced Termination P ft and/or Probability of New Call Blocking (P b). Since, both cannot be reduced simultaneously, usually keeping the P ft below a designated level DP ft is considered as QoS guarantee to the users of the system. However, P ft is related to system parameters namely, maximum capacity of the cell C, the average new call arrival rate λ, the average call holding time 1/μ, and the average cell dwell time 1/ηn by complex non linear equations. Therefore, Call Admission Control (CAC) for maintaining P ft at DP ft is a very challenging task. A fuzzy controller is proposed to dynamically maintain P ft at DP ft with changes in system parameters. Also, current cellular networks are employing CDMA as the multiple access technique since it provides much more capacity than other techniques. Interference received at the base station (BS) of a cell is considered in the decision making process of whether to admit a call or not. We describe the CAC criteria used in CDMA cellular networks in this paper. Also, through simulation we show that fuzzy controller can be integrated with other CAC schemes to guarantee QoS to the users.

Original languageEnglish (US)
Pages (from-to)4082-4086
Number of pages5
JournalIEEE International Conference on Communications
StatePublished - Aug 30 2004
Event2004 IEEE International Conference on Communications - Paris, France
Duration: Jun 20 2004Jun 24 2004


  • CDMA
  • Call Admission Control
  • Call holding time
  • Cell dwell time
  • Fuzzy Associative Memory
  • QoS

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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