POWER CONTROL AND POWER HEADROOM FOR COMPONENT CARRIER

摘要

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may coordinate power utilization across component carriers (CCs) with different transmission time interval (TTI) configurations. For example, the UE may reserve a portion of the transmit power for a CC with a reduced TTI length (e.g., an enhanced CC (eCC)). In other examples, the UE may dynamically allocate power between CCs with overlapping uplink periods. That is, the UE may borrow power allocated to one CC to transmit on an eCC. The UE may use a prioritization scheme to determine the transmit power for each CC. In some cases, the UE may send a power headroom report based on the power level of the eCC. The power headroom may be a virtual power headroom based on predicted eCC transmission power, or an actual power headroom based on uplink scheduling.

主权项

1. A method of wireless communication at a user equipment (UE), comprising:
receiving a carrier aggregation configuration comprising a first carrier with a first transmission time interval (TTI) length, a second carrier with a second TTI length different from the first TTI length, and a power control configuration; selecting a first transmission power level for the first carrier during a first TTI of the first TTI length; selecting a second transmission power level for the second carrier during a second TTI of the second TTI length, wherein the first TTI overlaps the second TTI and the second transmission power level is based at least in part on the power control configuration and the first transmission power level; transmitting on the first carrier based at least in part on the first transmission power level; and transmitting on the second carrier based at least in part on the second transmission power level.