Efficiency of network initiated detach of inactive subscribers for GPRS

In today's GPRS networks, low service usage often coincides with a considerable large number of subscribers, which are booked into the SGSN-registers of the core network. Network initiated detach of inactive subscribers (NID) may be used to remove those subscribers from the SGSN, which do not really use GPRS. Within This work model calculations are presented, which are based on current traffic measurement results. They show that this approach achieves a gain in subscribers of factor 2-4 at given SGSN-capacity.