A base station or other device may have access to multiple channels for communicating with a mobile device or other client device. In some cases, these channels may include high power channels and low power channels, where the high power channels are in frequency bands in which higher power signals are legally allowed relative to those of channels in other frequency bands. When allocating bandwidth for use in communicating with the mobile device, the base station is configured to preferentially use channels using relatively low power signals over channels that use relatively high power signals.