User terminal, radio base station, radio communication method and radio communication system
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United States of America Patent
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May 29, 2018
Issued Date -
N/A
app pub date -
Dec 15, 2014
filing date -
Dec 26, 2013
priority date (Note) -
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Abstract
A user terminal that communicates with a plurality of cell groups (CG), each group being formed with one or more cells to use different frequency bands. The user terminal receives downlink signals transmitted from each cell, and selects at least one cell, from cells to which uplink control signals can be allocated, and which are configured in each CG, and controls the cell as a cell to transmit an uplink control signal. When information to indicate cross-carrier scheduling (CCS) is include in a downlink control signal, the user terminal decides whether or not the cell having received the downlink control signal and the cell to transmit the uplink control signal are the same, and determines the resource to allocate to the uplink control signal based on this decision. Thus, maintaining system performance even when CCS and uplink control signal transmission in secondary cells are employed at the same time.
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