MAINTAINING TIME ALIGNMENT WITH MULTIPLE UPLINK CARRIERS
First Claim
1. A wireless transmit/receive unit (WTRU), comprising:
- a processor, the processor configured, at least to;
determine one or more sets of serving cells, each of the one or more sets of serving cells including at least one serving cell with a configured uplink component carrier (UL CC sets), each of the UL CC sets respectively associated with a group index of one or more group indices, each UL CC set of the one or more UL CC sets respectively including one or more uplink carriers that are associated with a same group index with which the UL CC set is associated, each of the one or more uplink carriers that are included in a respective UL CC set being configured to operate with a same Timing Advance (TA) of one or more Timing Advances (TAs), each of the UL CC sets having a respectively associated reference carrier providing a TA of the one or more TAs;
receive a first TA value via a first reference carrier, the first reference carrier associated with a first UL CC set; and
apply the first TA value to the one or more uplink carriers that are included in the first UL CC set.
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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.
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Citations
20 Claims
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1. A wireless transmit/receive unit (WTRU), comprising:
a processor, the processor configured, at least to; determine one or more sets of serving cells, each of the one or more sets of serving cells including at least one serving cell with a configured uplink component carrier (UL CC sets), each of the UL CC sets respectively associated with a group index of one or more group indices, each UL CC set of the one or more UL CC sets respectively including one or more uplink carriers that are associated with a same group index with which the UL CC set is associated, each of the one or more uplink carriers that are included in a respective UL CC set being configured to operate with a same Timing Advance (TA) of one or more Timing Advances (TAs), each of the UL CC sets having a respectively associated reference carrier providing a TA of the one or more TAs; receive a first TA value via a first reference carrier, the first reference carrier associated with a first UL CC set; and apply the first TA value to the one or more uplink carriers that are included in the first UL CC set. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for establishing timing advance, comprising:
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determining one or more sets of serving cells, each of the one or more sets of serving cells including at least one serving cell with a configured uplink component carrier (UL CC sets), each of the UL CC sets respectively associated with a group index of one or more group indices, each UL CC set of the one or more UL CC sets respectively including one or more uplink carriers that are associated with a same group index with which the UL CC set is associated, each of the one or more uplink carriers that are included in a respective UL CC set being configured to operate with a same Timing Advance (TA) of one or more Timing Advances (TAs), each of the UL CC sets having a respectively associated reference carrier providing a TA of the one or more TAs; receiving a first TA value via a first reference carrier, the first reference carrier associated with a first UL CC set; and applying the first TA value to the one or more uplink carriers that are included in the first UL CC set. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification