Abstract
An apparatus and method for maintaining time alignment with a plurality of carriers is disclosed. An uplink carrier group (UL CC set) operating with a single timing advance (TA) can be determined, and a 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 a few 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 in the UL CC set. The WTRU may determine which UL CC set the TA value is to be applied based on which DL carrier the command was transmitted. 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 multiple CC configurations upon expiration of the time alignment timer (TAT).
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| Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
| 5G | 07/11/2019 | ISLD-201910-015 | INTERDIGITAL INC |
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