AN ADAPTIVE METHOD FOR OVERLOAD CONTROL OF A DISPATCH CONTROLLER
Original Publication Date: 1997-Mar-01
Included in the Prior Art Database: 2002-May-14
A dispatch controller (DAP) provides mobility management and call control for dispatch services. In general, a DAP is designed to operate at a point where a certain rate of location changes, call initia- tions, and push-to-talks can be sustained indefinite- ly. This is called the normal operating point (see Figure 1). Unexpected events and natural variations in traffic create rates that push the DAP operating point beyond the normal point. Usually, there is a capacity reserve to account for these momentary traffic peaks and the DAP is able to operate up to a peak operating point (see Figure 1). However, if the traffic load increases beyond this peak operating point, the capacity starts degrading because the DAP cannot keep up with load and it starts losing messages.