A TOKEN-BASED METHOD FOR OVERLOAD CONTROL OF A DISPATCH CONTROLLER
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2002-Apr-29
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 indefinitely, This is called the normal operating point (see Fig- ure 1). Unexpected events and natural variations in trahic create rates that push the DAP operating point beyond the normal point. Usually, there is a capac- ity 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 traf- fic load increases beyond this peak operating point, the capacity starts degrading because the DAP can- not keep up with load and it starts losing messages.