A computer-implemented method of sharing a spectrum channel by a first communication system and a second communication system, wherein the spectrum channel comprises a radio frequency channel, wherein the first communication system is configured to use the spectrum channel for communication sessions at time intervals and in an operation area, wherein the second communication system comprises a mobile communication network including at least one or more base stations providing coverage within the operation area of the first communication system, and wherein the second communication system is configured to use the spectrum channel to support communication traffic over at least said one or more base stations, the method comprising: transmitting a request, by a processor associated with the first communication system to a channel management server associated with the second communication system, to clear the communication traffic of said one or more base stations from the spectrum channel in use by the second communication system, wherein transmitting the request comprises sending, from the processor to the channel management server: an operation time parameter that indicates a temporal attribute of a planned communication session of the first communication system, the operation time parameter including a start time of the planned communication session, an operation geography parameter that indicates a geographical attribute of the planned communication session, and an identification of the spectrum channel to be used for the planned communication session; in response to the request, the second communication system clearing the communication traffic over said one or more base stations from the spectrum channel in use by the second communication system, wherein clearing the communication traffic comprises: transferring existing communication traffic over said one or more base stations from the spectrum channel in use by the second communication system to a different spectrum channel; and blocking the spectrum channel from future use by said one or more base stations; and initiating, by the first communication system, the planned communication session on the spectrum channel after the communication traffic over said one or more base stations has been cleared from the spectrum channel in use by the second communication system. transmitting a request, by a processor associated with the first communication system to a channel management server associated with the second communication system, to clear the communication traffic of said one or more base stations from the spectrum channel in use by the second communication system, wherein transmitting the request comprises sending, from the processor to the channel management server: an operation time parameter that indicates a temporal attribute of a planned communication session of the first communication system, the operation time parameter including a start time of the planned communication session, an operation geography parameter that indicates a geographical attribute of the planned communication session, and an identification of the spectrum channel to be used for the planned communication session; an operation time parameter that indicates a temporal attribute of a planned communication session of the first communication system, the operation time parameter including a start time of the planned communication session, an operation geography parameter that indicates a geographical attribute of the planned communication session, and an identification of the spectrum channel to be used for the planned communication session; in response to the request, the second communication system clearing the communication traffic over said one or more base stations from the spectrum channel in use by the second communication system, wherein clearing the communication traffic comprises: transferring existing communication traffic over said one or more base stations from the spectrum channel in use by the second communication system to a different spectrum channel; and blocking the spectrum channel from future use by said one or more base stations; and transferring existing communication traffic over said one or more base stations from the spectrum channel in use by the second communication system to a different spectrum channel; and blocking the spectrum channel from future use by said one or more base stations; and initiating, by the first communication system, the planned communication session on the spectrum channel after the communication traffic over said one or more base stations has been cleared from the spectrum channel in use by the second communication system.