A method performed by a second base station for sharing air interface resources allocated to a first cell with a second cell, wherein the first cell uses a first radio access technology, RAT and is implemented by a first base station, and the second cell uses a second RAT and is implemented by the second base station, the method comprising: communicating, to a user equipment, UE, a second air interface resource configuration for a second air interface resource allocated to the second cell that uses the second RAT, the method being characterized by: receiving, from the first base station, a first air interface resource configuration for a first air interface resource allocated to the first cell that uses the first RAT, with the first air interface resource configuration being different from the second air interface resource configuration, and with the first cell at least partially overlapping the second cell; communicating, to the UE, the first air interface resource configuration; receiving a low-utilization indication for the first air interface resource; based on receiving the low-utilization indication, directing the UE to utilize the first air interface resource for transmitting uplink communications to the second base station using the second RAT; and receiving, from the UE, a first uplink communication using the first air interface resource and the second RAT. communicating, to a user equipment, UE, a second air interface resource configuration for a second air interface resource allocated to the second cell that uses the second RAT, the method being characterized by: receiving, from the first base station, a first air interface resource configuration for a first air interface resource allocated to the first cell that uses the first RAT, with the first air interface resource configuration being different from the second air interface resource configuration, and with the first cell at least partially overlapping the second cell; communicating, to the UE, the first air interface resource configuration; receiving a low-utilization indication for the first air interface resource; based on receiving the low-utilization indication, directing the UE to utilize the first air interface resource for transmitting uplink communications to the second base station using the second RAT; and receiving, from the UE, a first uplink communication using the first air interface resource and the second RAT. receiving, from the first base station, a first air interface resource configuration for a first air interface resource allocated to the first cell that uses the first RAT, with the first air interface resource configuration being different from the second air interface resource configuration, and with the first cell at least partially overlapping the second cell; communicating, to the UE, the first air interface resource configuration; receiving a low-utilization indication for the first air interface resource; based on receiving the low-utilization indication, directing the UE to utilize the first air interface resource for transmitting uplink communications to the second base station using the second RAT; and receiving, from the UE, a first uplink communication using the first air interface resource and the second RAT.