A wireless access point controls Carrier Aggregation (CA) over a wireless repeater chain. The wireless access point exchanges signaling with User Equipment (UE) over the wireless repeater chain which uses a number of repeater hops. The wireless access point selects a radio frequency for a Primary Component Carrier (PCC) based on the number of repeater hops. The wireless access point exchanges user data with the UE over the wireless repeater chain using the selected radio frequency for the PCC. The wireless access point determines uplink throughput for the user data. The wireless access point re-selects the radio frequency for the PCC based on the number of repeater hops and the uplink throughput. The wireless access point exchanges additional user data with the UE over the wireless repeater chain using the re-selected radio frequency for the PCC.