1. A communications system comprising: a plurality of subsystems; a reference oscillator coupled to the plurality of subsystems, wherein the reference oscillator is configured to provide a reference signal to the plurality of subsystems; and a controller coupled to the reference oscillator and the plurality of subsystems, wherein the controller is configured to: receive, from a first subsystem in the plurality of subsystems, a request to change a characteristic of the reference oscillator, determine, based on a priority of the request, whether to process the request, send, in response to determining that the request should be processed, a notification to the plurality of subsystems of an upcoming change to the characteristic of the reference oscillator, initiate, in response to determining that the request should be processed, a reconfiguration of the reference oscillator to meet a requirement of the first subsystem, determine whether performance of one or more subsystems in the plurality of subsystems will be impaired by the reconfiguration of the reference oscillator, and mitigate an impact on the one more subsystems in the plurality of subsystems by initiating a frequency tuning of respective one or more internal oscillators of the one or more subsystems in the plurality of subsystems.