Communication terminal
First Claim
1. A communication terminal, 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 having a same frequency as the primary carrier, of a first neighboring cell, and for a second corresponding carrier, having a same frequency as the secondary carrier, of a second neighboring cell; 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.
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Accused Products
Abstract
A communication terminal is capable of simultaneously communicating through a plurality of carriers by carrier aggregation, and the communication terminal comprises: a quality measurement unit for measuring the reception quality of a radio wave transmitted through a plurality of carriers from a base station of a connected cell to obtain a measured value; a primary carrier storage unit storing information specifying a primary carrier chosen from the plurality of carriers; a comparator for comparing a measured value of the primary carrier measured by the quality measurement unit to a threshold value; and a cell search unit for searching for another cell when the measured value of the primary carrier is less than or equal to the threshold value. Consequently, a search threshold value for carrier aggregation can be appropriately determined to perform a cell search and a quality measurement.
27 Citations
12 Claims
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1. A communication terminal, comprising:
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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 having a same frequency as the primary carrier, of a first neighboring cell, and for a second corresponding carrier, having a same frequency as the secondary carrier, of a second neighboring cell; 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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method performed by a communication terminal, the method comprising:
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controlling communication with a first base station through a plurality of carriers including at least a primary carrier and a secondary carrier by carrier aggregation, measuring reception quality of radio signals transmitted through the plurality of carriers from the first base station to obtain respective measured values; comparing the measured value of the primary carrier to a first threshold value; comparing the measured value of the secondary carrier to a second threshold value; 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, performing a neighboring cell measurement for a first corresponding carrier, having a same frequency as the primary carrier, of a first neighboring cell, and for a second corresponding carrier, having a same frequency as the secondary carrier, of a second neighboring cell; and when the measured value of the primary carrier is equal to or higher than the first threshold value, not performing the neighboring cell measurement; and when the 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. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification