A system and method for synchronizing SGSNs and GGSN in a mobile communication system that guarantees synchronization until a malfunction, if any, in an NTP server is cured. If malfunction occurs in the NTP server and an associated range, the NTP server is changed upon monitoring the malfunction and...http://www.google.fr/patents/US7339886?utm_source=gb-gplus-shareBrevet US7339886 - System and method for synchronizing SGSNs and a GGSN
System and method for synchronizing SGSNs and a GGSN
