Overload control strategies in a multiprocessor system with distributed data

This paper addresses overload control issues for distributed control systems, i.e. multiprocessor systems, in telephone exchanges, signalling transfer points, service control points, home location registers, etc. Three different strategies for rejecting calls, due to severe overload conditions, are examined. The strategies differ in that they allow call rejection during different time epochs of the entire life time of the call. The optimal solution, i.e. the largest throughput, can only be obtained by a centrally placed overload control mechanism which collects data from all processors in the syste