Patent ID: 11889317
Assignee: MOTOROLA MOBILITY LLC
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. An apparatus comprising:
a controller that
operates a first serving cell on a licensed carrier frequency and a second serving cell on an unlicensed carrier frequency,
performs a listen before talk (LBT) on the unlicensed carrier frequency for a first time duration, and
determines that the unlicensed carrier frequency is free; and

a transceiver coupled to the controller, where the transceiver
transmits an activation command on the first serving cell for receipt by a user equipment (UE), the activation command being configured to activate the UE to receive transmissions from the apparatus on the second serving cell, and
transmits, after determining that the unlicensed carrier frequency is free, a reserve transmission on the unlicensed carrier frequency at least until the apparatus begins transmission of the activation command on the first serving cell.