SYSTEMS AND METHODS FOR CARRIER AGGREGATION

摘要

A UE for performing carrier aggregation is described. The UE determines a duplex method of each serving cell for carrier aggregation. A primary cell is a FDD cell. A secondary cell is a time-division duplexing (TDD) cell. For transmitting HARQ-ACK information on a PUCCH f format 1b with channel selection in a later subframe n, the UE determines to use a single FDD serving cell HARQ-ACK reporting procedure based on whether a subframe n-4 is an uplink subframe for the secondary cell. Determining whether the subframe n-4 is an uplink subframe for the secondary cell is based on an uplink/downlink (UL/DL) configuration defined by a radio resource control common secondary cell (RRCCommonSCell) message.