Analysis of an access control mechanism for data traffic in an integrated voice/data wireless CDMA system

Ashwin Sampath, Narayan B. Mandayam, Jack M. Holtzman

Research output: Contribution to journalConference articlepeer-review

15 Scopus citations


In [1], an access protocol for short data messages in an integrated voice/data CDMA system was studied. It was assumed that voice traffic had priority and was less tolerant to delay than data traffic. Hence, the transmission of data traffic could be controlled to guarantee acceptable quality of service for voice. The data messages were of short duration and as a result, closed loop power control for them was not possible. The access protocol considered was an extension of [2], which was for data-only systems. A slotted system was considered for data. At the end of every slot, the base station would control the transmission of data users by increasing/decreasing data permission probability. Measured QoS for voice was the criterion. An approximate model wherein a one-dimensional Markov chain of just the persistence state was considered and solved explicitly. Imperfect power control for voice was accounted for. In this work, the protocol is studied in greater detail. Stability of the protocol is investigated and critical data load values developed. The results also show that at high data loads additional admission control such as limited retries will be necessary to maintain stability. Simulation results show good agreement with the analysis, in the desirable operating regions.

Original languageAmerican English
Pages (from-to)1448-1452
Number of pages5
JournalIEEE Vehicular Technology Conference
StatePublished - 1996
EventProceedings of the 1996 IEEE 46th Vehicular Technology Conference. Part 1 (of 3) - Atlanta, GA, USA
Duration: Apr 28 1996May 1 1996

ASJC Scopus subject areas

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


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