1. A method for wireless communication at a user equipment (UE) having a first radio supporting communications via a first frequency band and a second radio supporting communications via a second frequency band, comprising:receiving, via a first communication link in the first frequency band of a first cell, a configuration for a second communication link in the second frequency band of a second cell;
determining whether an uplink for the second communication link can connect;
activating the second radio based at least in part on the configuration;
receiving, via the second radio, a downlink transmission over the second communication link; and
transmitting uplink control information responsive to the downlink transmission over the first communication link or over the second communication link based at least in part on the determining whether the uplink for the second communication link can connect.