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

Claim 0:
1. A method for a base station to make a transmission between the base station and a user equipment (UE) on an unlicensed carrier frequency, the method comprising:
operating, by the base station, a first serving cell on a licensed carrier frequency and a second serving cell on an unlicensed carrier frequency;
performing, by the base station, a listen before talk (LBT) on the unlicensed carrier frequency for a first time duration;
determining, by the base station, that the unlicensed carrier frequency is free;
transmitting, by the base station, an activation command on the first serving cell for receipt by the UE, the activation command being configured to activate the UE to receive transmissions from the base station on the second serving cell; and
transmitting, by the base station, after determining that the unlicensed carrier frequency is free, a reserve transmission on the unlicensed carrier frequency at least until the base station begins transmission of the activation command on the first serving cell.