Prediction Based Access Control in Integrated Voice/Data CDMA Systems

We propose access control protocols for integrated voice/data CDMA systems that are based on estimating the residual capacity available for data users. The residual capacity is derived from the feasibility condition for power control using an adaptive prediction technique based on Delta Modulation. The analysis is extended for the case of imperfect power control. Two access control protocols are considered: Modified Delta Modulation with scheduled access (MDM–S), and Modified Delta Modulation with random access (MDM–R). Comparisons with earlier proposed protocols reveal a better performance in terms of data mean access delay for a given system capacity and outage probability.