A radiocommunication system supports high throughput rates over an air interface. An access network interface, e.g., between a base station and base station controller, conveys information between the base station and the rest of the terrestrial system. Techniques are provided to adjust transmission rates over the air interface based on loading of the access network. Techniques are also provided to control bandwidth allocation over the access network interface and distribute call blocking/delay percentages when there is an imbalance between the capacity of the air interface and the access network interface.