Patent ID: 9560677
Date: 2017-01-31
CPC Classifications: H04W

Claim:
1. A communication control method employed in a mobile communication system including a general cell supporting PTM distribution of MBMS data and a CSG (Closed Subscriber Group) cell not supporting PTM distribution of the MBMS data, the method comprising: a step A of transmitting, by a user terminal in an idle mode with the general cell selected as a serving cell, a connection establishment request message to the general cell; a step B of transmitting, by the general cell, in response to reception of the connection establishment request, a connection establishment message for establishing the connection, to the user terminal; and a step C of transmitting, by the user terminal, in response to reception of the connection establishment message, an establishment completion message indicating completion of establishment of the connection, to the general cell, wherein in the step B, the general cell transmits a notification request message together with the connection establishment message to the user terminal, the notification request message is for requesting transmission of a proximity notification indicating that the CSG cell exists near the user terminal, and in the step C, the user terminal determines, based on an autonomous search procedure, whether the CSG cell exists near the user terminal, and transmits, in response to the user terminal determining that the CSG cell exists near the user terminal, the proximity notification together with the establishment completion message to the general cell, the method further comprising: a step D of transmitting, by the general cell, in response to reception of the proximity notification from the user terminal, a measurement instruction instructing measurement of the CSG cell, to the user terminal, wherein said autonomous search procedure further comprises: