A framework for power and activity factor allocation in a multi-class CDMA system

X. Wu, R. Srikant

Research output: Contribution to journalConference articlepeer-review


We consider a multimedia CDMA uplink where there are multiple classes of users with different Quality-of-Service (QoS) requirements. Each user is modeled as an ON-OFF source, where in the ON state, the user transmits a fixed number of bits in each time slot and in the OFF state, the user is silent. The probability of being in the ON state, known as the activity factor, could be different for different users. Assuming a constant channel gain, we first characterize the set of transmit power levels, activity factors and number of users in each class that can be supported by a system with a given spreading gain under the constraint that each user's QoS requirement must be met. Using this characterization, we then present a utility function-based algorithm for choosing the activity factors of elastic users in the network.

Original languageEnglish (US)
Pages (from-to)138-149
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2001
EventScalability and Traffic Control in IP Networks - Denver, CO, United States
Duration: Aug 22 2001Aug 24 2001


  • Admission Control
  • CDMA
  • Elastic Users
  • Multiple call classes
  • Quality-of-Service

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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