Patent ID: 8249644

Claim:
A wireless terminal for communicating with a base station, the base station having a base-station-side wireless transceiver which transmits and receives a signal, and the base station having a wireless transmitter which transmits a signal and operates with lower power than the base-station-side wireless transceiver, the wireless terminal comprising: a terminal-side wireless transceiver configured to communicate with the base-station-side wireless transceiver; a first power source configured to supply power to the terminal-side wireless transceiver; a wireless receiver configured to receive the signal transmitted from the wireless transmitter and to operate with lower power than the terminal-side wireless transceiver; a second power source configured to supply power to the wireless receiver; a first controller configured to perform control so that the first power source is turned on and the second power source is turned off in a non-power-saving mode, in which the base-station-side wireless transceiver and the terminal-side wireless transceiver communicates with each other; a second controller configured to perform control so that the first power source is turned off and the second power source is turned on in a power-saving mode, in which the wireless transmitter and the wireless receiver communicates with each other; a switch request frame transmitter configured to transmit, in the non-power-saving mode, a switch request frame for switching a mode to the power-saving mode to the base station through the terminal-side wireless transceiver; a power-saving mode switcher configured to switch the mode to the power-saving mode when the terminal-side wireless transceiver receives, from the base station, a permission frame for permitting the mode to be switched to the power-saving mode; and a communication processor configured to acquire user data from the base station by turning on the first power source and transmitting an acquisition request frame for acquiring the user data through the terminal-side wireless transceiver when in the power-saving mode, the wireless receiver receives a notification frame notifying that the user data addressed to the wireless terminal is existent from the base station.