Patent ID: 8204072

Claim:
A method, comprising: providing a downlink transmission time interval; determining a plurality of available frequency ranges within a plurality of candidate frequency ranges for at least one communication device of a communication system, wherein an other communication system has a priority of usage of the plurality of candidate frequency ranges, wherein determining the plurality of available frequency ranges comprises: determining, after providing the downlink transmission time interval, for each candidate frequency range of the plurality of candidate frequency ranges, either that the candidate frequency range is an available frequency range within the plurality of candidate frequency ranges for the at least one communication device to operate in when the other communication system is at least temporarily not in operation in the candidate frequency range, or that the candidate frequency range is an unavailable frequency range when the other communication system is in operation in the candidate frequency range; providing an uplink transmission time interval for the plurality of available frequency ranges; determining that the other communication system is resuming operation in a particular candidate frequency range of the plurality of candidate frequency ranges; and vacating the particular candidate frequency range.