Maintaining time alignment with multiple uplink carriers
First Claim
1. A wireless transmit/receive unit (WTRU), comprising:
- a memory; and
a processor, the processor configured, at least to;
determine two or more sets of uplink (UL) component carriers, each of the two or more sets of UL component carriers being associated with a respective group index, and each of the two or more sets of UL component carriers comprising UL carriers that are configured to operate with a common Timing Advance (TA);
start or restart a Time Alignment Timer (TAT) associated with a first set of UL component carriers of the two or more sets of UL component carriers;
receive a first common TA value associated with the first set of UL component carriers;
apply the first common TA value to at least a first uplink carrier that is included in the first set of UL component carriers;
determine whether the first set of UL component carriers comprises a primary cell (PCell);
release one or more configurations for at least one cell in each of the two or more sets of UL component carriers when the first set of UL component carriers includes the PCell and the TAT has expired for the first set of UL component carriers; and
release one or more configurations for at least one cell in the first set of UL component carriers when the first set of UL component carriers does not include the PCell and the TAT has expired for the first set of UL component carriers.
0 Assignments
0 Petitions
Accused Products
Abstract
Maintaining time alignment with multiple carriers is contemplated. A group of uplink carriers (UL CC sets) 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'"'"'s (WTRU) capability of using multiple TAs may define a group index of a few bits for each UL CC set. 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 based on which DL carrier the command was transmitted from. The WTRU may determine which UL CC set the TA value applies to based on the Group Index being explicitly provided in the command. The WTRU may release multi-CC configurations upon Time Alignment Timer (TAT) expiry.
16 Citations
20 Claims
-
1. A wireless transmit/receive unit (WTRU), comprising:
-
a memory; and a processor, the processor configured, at least to; determine two or more sets of uplink (UL) component carriers, each of the two or more sets of UL component carriers being associated with a respective group index, and each of the two or more sets of UL component carriers comprising UL carriers that are configured to operate with a common Timing Advance (TA); start or restart a Time Alignment Timer (TAT) associated with a first set of UL component carriers of the two or more sets of UL component carriers; receive a first common TA value associated with the first set of UL component carriers; apply the first common TA value to at least a first uplink carrier that is included in the first set of UL component carriers; determine whether the first set of UL component carriers comprises a primary cell (PCell); release one or more configurations for at least one cell in each of the two or more sets of UL component carriers when the first set of UL component carriers includes the PCell and the TAT has expired for the first set of UL component carriers; and release one or more configurations for at least one cell in the first set of UL component carriers when the first set of UL component carriers does not include the PCell and the TAT has expired for the first set of UL component carriers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method for establishing a timing advance, comprising:
-
determining two or more sets of uplink (UL) component carriers, each of the two or more sets of UL component carriers being associated with a respective group index, and each of the two or more sets of UL component carriers comprising UL carriers that are configured to operate with a common Timing Advance (TA); starting or restarting a Time Alignment Timer (TAT) associated with a first set of UL component carriers of the two or more sets of UL component carriers; receiving a first common TA value associated with the first set of UL component carriers; applying the first common TA value to at least a first uplink carrier that is included in the first set of UL component carriers; determine whether the first set of UL component carriers comprises a primary cell (PCell); release one or more configurations for at least one cell in each of the two or more sets of UL component carriers when the first set of UL component carriers includes the PCell and the TAT has expired for the first set of UL component carriers; and release one or more configurations for at least one cell in the first set of UL component carriers when the first set of UL component carriers do not include the PCell and the TAT has expired for the first set of UL component carriers. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification