Patent ID: 11917455
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 3:
4. A transmission parameter control method in a radio communication system that includes a plurality of radio base stations and a control station, each of the radio base stations performing, with a plurality of radio terminal stations, communication of a first method in which reception confirmation is enabled and communication of a second method in which reception confirmation is not possible, the control station controlling the plurality of radio base stations, wherein the communication of the first method is unicast communication, and the communication of the second method is multicast communication or broadcast communication wherein
each of the radio base stations collects radio communication information in the communication of the first method with the radio terminal stations and radio environment information about radio communication except own station, transmits the collected information to the control station, and receives, from the control station, transmission parameters in the communication of the second method with the radio terminal stations, and
the control station determines the transmission parameters in the communication of the second method between each of the radio base stations and the radio terminal stations based on the radio communication information and the radio environment information received from the plurality of radio base stations, and transmits the transmission parameters to the radio base stations,
wherein transmission parameters include all of a modulation level, a length of guard interval, a number of transmission streams, bandwidth, and an error method.