COMMUNICATION SYSTEM

摘要

When a representative service control device receives a PDP context succession request signal according to a handover communication procedure prescribed in an applicable standard, the representative service control device transmits a P-TMSI contained in the PDP context succession request signal as an address request to a database device. When the representative service control device receives address information of a service control device from the database device, the representative service control device forwards the PDP context succession request signal received from the request transmission means to the received address.

主权项

1. A communication system that configures an IMS (IP Multimedia Subsystem) network, comprising:
a femtocell base station; a service control device; a core device that controls a call; and a database device, wherein said service control device has an SGSN (Serving GPRS Support Node) function section that sends back a signal transmitted from a network that uses a communication procedure different from that of the IMS network in the same manner as a signal transmitted from an SGSN, a plurality of service control devices being provided in said IMS network, wherein one of the plurality of service control devices has been designated as a representative service control device, wherein said database device comprises: storage means that correlatively stores a P-TMSI (Packet-Temporary Mobile Subscriber Identity) issued to a UE (User Equipment) and address information of a service control device that manages a femtocell base station to which the UE belongs; search means that searches said storage means for address information correlated with the P-TMSI received from said representative service control device; and address transmission means that transmits the address information for which said search means has searched said storage means to said representative service control device, and wherein said service control device comprises: request transmission means that is used as said representative service control device and transmits a P-TMSI contained in a PDP (Packet Data Protocol) context succession request signal received according to a handover communication procedure prescribed in an applicable standard as an address request to said database device; and forward control means that is used as said representative service control device and that forwards the PDP context succession request signal received by said request transmission means to an address represented by address information of the service control device received from said database device.