Controller, communication terminal, and wireless communication system

A communicating method for use in a controller, the method comprising:

• generating preferential data that is 2nd-type data, the 2nd-type data being different from 1st-type data wirelessly communicated between the controller and a communication terminal;
• determining a length of an active period included in a frame that is repetitive unit time, the active period being a period during which the controller communicates with the terminal in the frame;
• generating a broadcasting signal including information corresponding to the determined length of the active period;
• transmitting the broadcasting signal to the terminal on a frame basis by wireless communication with the terminal, and transmitting the 1st-type data during the active period, wherein in the determining, the length of the active period is shortened in the case where the 2nd-type data is generated in the generating of preferential data, and a preferential data period is set in an ex-active period obtained by the shortening of the active period, the preferential data period being a period during which the 2nd-type data is transmitted, and
• in the transmitting, the 2nd-type data is transmitted to the terminal during the preferential data period.

An integrated circuit comprising:

• a normal data generating unit configured to generate 1st-type data;
• a preferential data generating unit configured to generate 2nd-type data that is different from the 1st-type data;
• a determining unit configured to determine a length of an active period included in a frame that is repetitive unit time, the active period being a period during which communication with a terminal in the frame is performed;
• a signal generating unit configured to generate a broadcasting signal including information corresponding to the determined length of the active period;
• and
• a transmitting unit configured to transmit the broadcasting signal to the terminal on a frame basis by wireless communication with the terminal, and to transmit the 1st-type data during the active period,
• wherein the determining unit configured to shorten the length of the active period in the case where the preferential data generating unit generates the 2nd-type data, and to set a preferential data period in an ex-active period obtained by the shortening of the active period, the preferential data period being a period during which the 2nd-type data is transmitted, and the transmitting unit is configured to transmit the 2nd-type data to the terminal during the preferential data period.