Patent ID: 8705965

Claim:
A communication system comprising: at least one terminal unit; and a control unit that exchanges data with the at least one terminal unit, wherein the at least one terminal unit includes: a reception unit that receives a frame transmitted from the control unit; a transmission unit that transmits a frame to the control unit; a control circuit that processes the frame; and a sleep control circuit that enables a power-saving state for at least a part of one of the at least one terminal unit; wherein the control unit includes: a reception unit that receives a frame transmitted from the at least one terminal unit; a transmission unit that transmits a frame to the at least one terminal unit; and a control circuit that processes the frame; wherein the control circuit of the control unit cyclically allocates, to the at least one terminal unit, in a power-saving state of the at least one terminal unit, a band for the at least one terminal unit, in the power-saving state of the at least one terminal unit, to transmit a sleep cancel report to the control unit, and the transmission unit of the control unit cyclically transmits a control frame containing allocation information about the band to the at least one terminal unit in the power-saving state of the at least one terminal unit.