A Call Admission Strategy for Multirate Wideband CDMA Systems
DS-CDMA is an interference multiple access technology. Both system capacity and quality of service (QoS) constraints are functions of multiple access interference (MAI). Since MAI is proportional to the transmit power strengths of other users, the level of transmit power by all participating users requires careful planning and control in order to attain QoS satisfaction and high system utilization. The power distribution of a multirate wideband CDMA system is investigated. The transmit power levels are shown to be functions of the spread bandwidth, user data rates, and the user QoS requirements. It is shown that the maximum allowable traffic load that satisfies QoS specification is upper bounded by the spread bandwidth. A call admission control algorithm to ensure QoS satisfaction is proposed. Numerical results which demonstrate the viability of the proposed call admission strategy are presented.
KeywordsPower Control Traffic Demand Call Admission Control Multiple Access Interference Transmit Power Level
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