Dynamic allocation of frequency bands to user devices

A method, system, and medium are provide for dynamically allocating frequency bands transmitted by a base station to a user device to optimize signal strength at the device. A distance from the base station to the user device is determined, and if the distance is greater than a distance threshold, a lower-frequency band is allocated to the device. If the distance is less than the distance threshold, a penetration loss factor for the device is calculated. If the penetration loss factor is greater than a penetration loss threshold, a lower-frequency band is allocated to the device, and if the penetration loss factor is less than the penetration loss threshold, a higher-frequency band is allocated to the device.