Mobile communication system, mme, incoming call control method for mobile communication system, and incoming call control method for mme

摘要

A mobility management device makes an ISR feature operate in collaboration with an SGSN. It is assumed that a location registration area managed by the mobility management device exists within a location registration area managed by the SGSN, and an incoming voice call is made to a mobile communication device during when the mobile communication device is moving out of the location registration area. The mobility management device includes an incoming voice call control unit that, in the above case, sends a response message indicating that the mobile communication device is moving to a switching device and, when an incoming voice call message is sent again from the switching device to a switching device after the lapse of a specified period of time, performs call attempt to the mobile communication device.