Patent ID: 11902186
Assignee: SUN PATENT TRUST
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An integrated circuit for controlling a communication terminal, the integrated circuit comprising:
communication circuitry which, in operation, communicates with a first base station through a plurality of carriers, including at least a primary carrier and a secondary carrier, by carrier aggregation; and
control circuitry which, in operation:
measures reception quality of radio signals transmitted through the plurality of carriers from the first base station to obtain respective measured values;
compares the measured value of the primary carrier to a first threshold value; and
compares the measured value of the secondary carrier to a second threshold value, wherein the control circuitry, in operation:

when discontinuous reception is performed by the communication terminal, wherein periods during which the discontinuous reception is performed by the communication terminal include no data transmission and reception intervals of determined length:
when the measured value of the primary carrier is lower than the first threshold value, performs a neighboring cell measurement for a first corresponding carrier, of a first neighboring cell, having a same frequency as the primary carrier and for a second corresponding carrier, of a second neighboring cell, having a same frequency as the secondary carrier; and
when the measured value of the primary carrier is equal to or higher than the first threshold value, does not perform the neighboring cell measurement; and

when discontinuous reception is not performed by the communication terminal, sends measurement results to the first base station based on the measured value of the primary carrier and the measured value of the secondary carrier.