Various solutions for power consumption reduction with respect to user equipment (UE) in mobile communications are described. A UE may receive first control information in a first transmission time interval (TTI). The UE may determine whether to turn on a radio frequency transceiver of the UE in a second TTI according to the first control information. The first control information indicates whether downlink data for the apparatus is scheduled in the second TTI. The UE may further monitor first control information in a first radio carrier. The UE may determine whether to turn on a radio frequency transceiver of the UE to receive downlink information in a second radio carrier according to the first control information. The first control information indicates whether downlink information for the apparatus is scheduled in the second radio carrier.