A new time-based outage criterion for the forward and reverse links of DS-CDMA cellular systems

Previous work on outage criteria and cell admission policies in direct sequence CDMA cellular systems has focused on the reverse, or subscriber-to-base link. Such criteria generally are based on noise at the receiver. We show that a simple received noise rise estimate is not sufficient to declare a blocking or outage situation. We resolve the problem by proposing a new outage calculation which includes both a time sequential factor and simultaneous consideration of the forward link. The outage criterion is based on the inability of the physical transmitting device to produce enough power to generate the subjectively required error rate over some time continuous period. We show how the calculation can be applied to any distribution of subscribers, and cells, and any propagation environment. The outage is calculated not just statistically but can also be located in a realistic environment.