A framework for load control in 3rd generation CDMA networks

In this paper we present a theoretical framework for load control in third-generation CDMA systems and discuss its application with a few examples. Starting with the general transmission model we derive a unified description of resource consumption and system load for the uplink and for the downlink. The basic resources in a CDMA system are the total received power in the uplink and the total transmitted power in the downlink. It turns out that very similar relations can be found for the uplink and for the downlink. In addition to the well-known formulation of the uplink noise rise we introduce the novel concept of downlink power rise to define the system load in the downlink. The impacts of intrinsic system attributes such as loss of orthogonality in the downlink and variable data rate transmission are studied. Moreover, it is shown how the load control theory can be applied to admission control, random access control and dynamic scheduling in UMTS