Communication control device and communication control method

A communication control method for managing a second wireless system that desires to secondarily use at least one frequency being used by a first wireless system different from the second wireless system, the at least one frequency being in the 3.5 GHz band, the communication control method performed by a communication device and comprising:

• acquiring, by the communication device from the second wireless system, desired communication parameter information regarding secondary use, by the second wireless system, of the at least one frequency in the 3.5 GHz band being used by the first wireless system;
• determining by the communication device whether the desired communication parameter information is either:
• a desired fixed communication parameter to include information regarding each of a maximum transmission power and a frequency in the 3.5 GHz band assigned to the first wireless system that are desired by the second wireless system, or
• a desired flexible communication parameter to include a requirement regarding each of a bandwidth and a transmission power range in the 3.5 GHz band assigned to the first wireless system that are desired by the second wireless system;
• setting by the communication device at least one tentative communication parameter for the second wireless system on a basis of the determined desired communication parameter information;
• determining, by the communication device by using a protection criterion for the first wireless system, that the at least one tentative communication parameter satisfies a prescribed requirement regarding the first wireless system,
• wherein the determining by the communication device that the at least one tentative communication parameter satisfies the prescribed requirement comprises:
• in a case where the desired communication parameter is determined by the communication device to be the desired fixed communication parameter, performing a fixed parameter Primary Protection function to determine that the desired maximum transmission power and the desired frequency in the 3.5 GHz band may be used by the second wireless system without hindering radio-wave use by the first wireless system, and
• in a case where the desired communication parameter is determined by the communication device to be the desired flexible communication parameter, performing a flexible parameter Primary Protection function to determine that the desired bandwidth and the desired transmission power range in the 3.5 GHz band may be used by the second wireless system without hindering radio-wave use by the first wireless system, followed by an Enhanced Spectrum Coordination function of adjusting at least one frequency in the desired bandwidth and at least one maximum allowable transmission power in the desired transmission power range to reduce or avoid interference in the 3.5 GHz band between communication nodes of the second wireless system;
• and
• reporting a permission communication parameter based on the tentative communication parameter by the communication device to the second wireless system.