Abstract
PROBLEM TO BE SOLVED: To maintain time alignment with multiple carriers.SOLUTION: A group of uplink carriers (UL CC set) that operate with a single Timing Advance (TA) may be determined, and a TA value may be applied to a specific UL CC set. A wireless transmit/receive unit (WTRU) may use multiple TAs. A group index of a few bits for each UL CC set may be defined. A TA Command received in a Random Access Response message may be used to apply the TA value to each UL carrier of the UL CC set. The WTRU may determine which UL CC set the TA value applies to on the basis of which DL carrier the command was transmitted from. The WTRU may determine which UL CC set the TA value is applied to on the basis of the Group Index being provided in the command. The WTRU may release multi-CC configurations upon Time Alignment Timer (TAT) expiry.
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