Abstract
An apparatus and method for maintaining time alignment with multiple carriers is disclosed. An uplink carrier group (UL CC set) that operates using a single timing advance (TA) can be determined and the TA value can be applied to a specific UL CC set. The ability of a wireless transmit / receive unit (WTRU) to use multiple TAs may define several bits of group bits for each UL CC set. The TA command received in the 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 to apply the TA value to based on which DL carrier the command was sent from. The WTRU may determine which UL CC set the TA value is to be applied based on the group index explicitly provided in the command. The WTRU may release the multiple CC configuration upon expiration of the time alignment timer (TAT).
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| 5G | 08/11/2019 | ISLD-201910-015 | INTERDIGITAL INC |
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