Methods, systems, and devices for wireless communications are described. In some wireless communications systems, a base station may communicate with multiple user equipment (UEs) using multiple radio access technologies (RATs) on a single carrier. As described herein, a base station may transmit an indication that a carrier associated with a first RAT (e.g., Long Term Evolution (LTE)) may support communications using a second RAT (e.g., New Radio (NR)). The base station may transmit the indication in a control channel (e.g., physical broadcast control channel (PBCH)) on the carrier sent along with synchronization signals associated with the first RAT. A UE configured to communicate using the second RAT (e.g., NR) may receive the indication in the control channel and utilize the synchronization signals (e.g., LTE synchronization signals) to synchronize with the base station.