Patent ID: 9674842
Date: 2017-06-06
CPC Classifications: H04J,H04L,H04W

Claim:
1. A communication control method in a mobile communication system, comprising: transmitting, by a first base station, a first synchronization signal at a first frequency band in the center of a particular carrier, the first synchronization signal being for use to establish synchronization; transmitting, by the first base station in response to receiving uplink interference within the particular carrier, a second synchronization signal in a second frequency band different from the first frequency band within the particular carrier, the second synchronization signal being for use to establish synchronization; notifying, by a second base station, a second user terminal under control of the second base station of a radio resource to be used for the transmission of the second synchronization signal; performing, by the second user terminal, measurement based on the radio resource notified by the second base station; transmitting, by the second user terminal, a measurement report of the measurement to the second base station; determining, by the second base station, whether a Reference Signal Received Power (RSRP) measurement result for the first base station is contained in the measurement report; in response to determining that the RSRP measurement result for the first base station is contained in the measurement report, identifying, by the second base station, the second user terminal as an interference source causing the uplink interference received by the first base station within the particular carrier; and causing, by the second base station, the second user terminal identified as the interference source, to perform handover from the particular carrier to another carrier.