147results about "Wireless communication energy reduction" patented technology

The object of the present invention is to provide an electronic device capable of reducing consumption of power supplied to active elements used for a rotary operation unit in a stand-by time.

The electronic device according to the present invention includes the rotary operation unit that is freely rotatable, active elements 31 and 32 for detecting rotation of the rotary operation unit, and control means 43 for controlling the power supply to the active elements 31 and 32 depending on a state of the device.

A method for updating a location in a wireless communication system is disclosed. The method includes transmitting a request message to enter idle mode, receiving a response message including an Identifier (ID) of a first paging group and an ID of a second paging group in response to the request message, activating a paging group location update timer, when the MS leaves an area of the first paging group, and updating a location according to the paging group location update timer.

Disclosed is a wireless transmitter/receiver provided with: a local oscillator which oscillates at a predetermined local oscillator frequency; a mixer which mixes a local oscillation signal of the local oscillation frequency outputted from an output terminal of the local oscillator and a radio signal received by an antenna; a modulation circuit which modulates the local oscillator signal and generates a radio signal; and a transmission/reception switching unit which selectively switches over between a reception state in which the output terminal of the local oscillator is connected to the mixer and a transmission state in which the output terminal is connected to the antenna without passing through the mixer.

A low power consumption protocol for low power communication devices attached to an asynchronous network is described. In this protocol, a communication device is used as a high communication duty cycle Mediation Device (MD), thus permitting other communication devices to use a low communication duty cycle framing structure. The MD functions as a storage and retrieval service for messages between two devices when one device is not able to communicate. When the previously unavailable device becomes available, it can check in with the MD to retrieve any missed messages and respond to these messages accordingly. In a communication network, each of the low power communication devices can be configured to behave as MD's for a small amount of time. Sharing this responsibility among all communication devices in the network allows each device to maintain an low average communication duty cycle. This technique is applicable to a low power, low cost, zero-configuring, self-organizing, asynchronous network.

A method of awaking a communication device operating in a sleep mode for a wireless network interface card includes continuously sending a plurality of coupling packets to maintain coupling between the communication device and a remote communication device, receiving a wireless packet from the remote communication device, determining a packet type of the wireless packet according to a packet format corresponding to a wake-up packet, and controlling the communication device to leave the sleep mode when the wireless packet is determined to be the wake-up packet.

A system and method for operating a wireless network provides for sending a wakeup tone, periodically waking up from a sleep mode to listen for the wakeup tone, upon receiving the wakeup tone, listening for at least one second tone, the at least one second tone being one of (i) a tone in a frequency different from the wakeup tone and (ii) a pattern of tones including at least one frequency different from the wakeup tone, and upon receiving the at least one second tone, performing an action based on the at least one second tone.

An electronic device includes a communication unit which performs transmission/reception of data through a wireless network, and an application processing unit which executes an application processing. While the application processing is not required, the application processing unit is in a sleep state or a stand-by state.

In an information processing apparatus, an open/close detecting driver detects whether the information processing apparatus is opened or closed. If the open/close detecting driver detects that the information processing apparatus is opened or closed, an open/close-event handler determines whether the information processing apparatus is in an unused state. On the basis of this determination, the open/close-event handler controls lighting of a backlight.

The present invention relates to a mobile terminal capable of providing path information, and a control method therefor. The mobile terminal according to one embodiment of the present invention comprises: a camera; and a control unit for activating, if an event occurs, the camera, detecting whether the mobile terminal is in a vehicle-mounted state and whether the vehicle is traveling by using images received through the camera and, if it is determined, according to the detection result, that the vehicle is traveling in a state in which the mobile terminal is mounted on the vehicle, activating a gesture function of controlling the event by recognizing a gesture of a user.