Patent application number | Description | Published |
20130026924 | LED DRIVING CIRCUIT PACKAGE - An LED driving circuit package includes a rectification unit to receive an AC power voltage and rectify the AC power voltage to generate a ripple voltage, an LED driving switching unit including a plurality of switch units and a plurality of current control units. The LED driving circuit package further includes a low voltage control unit including a circuit power supply unit to generate low voltage power, a voltage detection unit to detect a magnitude of the ripple voltage, a reference frequency generation unit to generate a reference frequency, and a reference pulse generation unit to generate a reference pulse for controlling the operation of the LED driving switch unit according to the reference frequency and a magnitude of the voltage detected by the voltage detection unit. | 01-31-2013 |
20130026931 | LED LUMINESCENCE APPARATUS AND METHOD OF DRIVING THE SAME - An LED luminescence apparatus includes a plurality of LED units connected in series which are configured to receive a unidirectional ripple voltage, a plurality of switch units, one end of each being connected to the cathode of one of the plurality of LED units, a plurality of constant current control circuit units, one end of each being connected to an another end of a respective switch unit to receive a current from the respective switch unit, each of the constant current control circuit units being configured to output a current control signal to the respective switch unit to control a magnitude of the received current to have a specific value, and a current comparison unit to receive currents flowing from the plurality of switching units, and generate a plurality of switching control signals for the respective switch units to sequentially drive the plurality of constant current control circuit units. | 01-31-2013 |
20130026935 | LED LUMINESCENCE APPARATUS - A light-emitting diode (LED) luminescence apparatus configured to receive an alternating current (AC) power includes a plurality of LED units, and a plurality of constant current control units electrically connected to the plurality of LED units. The current control units are configured to control current flowing through each of the LED units so that the current has a specific magnitude. | 01-31-2013 |
Patent application number | Description | Published |
20120163216 | MEDIA ACCESS CONTROL APPARATUS AND METHOD IN WIRELESS LOCAL AREA NETWORK SYSTEM - Disclosed is a media access control apparatus and method in a wireless local area network (LAN) system, which improves the performance of a wireless network by obtaining a transmission opportunity based on information on a station (STA), received from an access point (AP) in a contention-based distributed media access control system such as an IEEE 802.11 wireless LAN system. In the media access control apparatus and method, a station determines a contention window (CW) value based on information on other stations accessing a same access point and information on the idle state of a channel, so that an inefficient CW value is be set in a Distributed Coordination Function (DCF) used in the IEEE 802.11. Accordingly, it is possible to increase the processing speed of the station and to the efficiency of a wireless LAN network. | 06-28-2012 |
20130185535 | APPARATUS AND METHOD FOR PROCESSING NON-SEQUENTIALLY STORED DATA - An apparatus and method for processing non-sequentially stored data is provided. The data processing apparatus may include an order information mapping unit to map transmission order information to data, an address list generating unit to generate an address list including addresses of the data arranged sequentially based on the transmission order information, and a data processing unit to process the data corresponding to each of the addresses based on an address order of the address list. | 07-18-2013 |
20130208656 | METHOD FOR CONTROLLING CHANNEL ACCESS IN WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR THE SAME - A method for controlling channel access performed by an access point (AP) in a wireless system is provided. The method includes: receiving at least one frame from at least one station (STA), respectively, for a specific time period, each frame including information on a contention window (CW) used when the frame is transmitted; processing information one at least one CW for each STA; determining whether to control the channel access based on the processed information on the CW; selecting an abnormal STA candidate group if it is determined that the channel access control is performed; and controlling the channel access to each STA included in the abnormal candidate STA group. | 08-15-2013 |
20140314060 | METHOD AND APPARATUS FOR EFFICIENT AGGREGATION SCHEDULING IN WIRELESS LOCAL AREA NETWORK (WLAN) SYSTEM - Provided is a method and apparatus for efficient aggregation scheduling in a wireless local area network (WLAN) system, the apparatus including a delay setting unit to set a required delay time for each access category (AC), a storing unit to store a traffic identification (TID) of a packet in a queue of a corresponding AC when the packet arrives, a delay time calculator to calculate a maximum delay time predicted when the packet arriving at the queue is configured to be an A-MPDU and the configured A-MPDU is transmitted, and an A-MPDU configuring unit to compare the calculated maximum delay time and the required delay time, and configure a corresponding A-MPDU when the calculated maximum delay time is greater than the required delay time. | 10-23-2014 |
Patent application number | Description | Published |
20090135942 | APPARATUS AND METHOD FOR TRANSMITTING DATA USING MULTI-ANTENNA - Provided are an apparatus and method for transmitting data using a multi-antenna. The apparatus includes a transmission buffer selecting unit for selecting transmission buffer of an antenna group corresponding to characteristics of each aggregated Medium access control Protocol Data Units (MPDU) when a list of aggregated MPDUs to transmit is received; a data transmitting unit for generating a list of aggregated MPDUs to transmit with storage information of the aggregated MPDUs, transferring the generated list to the transmission buffer selecting unit and transmitting corresponding aggregated MPDUs through the selected transmission buffer; and a timing controlling unit for controlling a transmission timing of each aggregated MPDU. | 05-28-2009 |
20090141679 | METHOD FOR FORMING FRAME IN WIDEBAND WIRELESS COMMUNICATION SYSTEM USING MULTI-ANTENNA - A method for forming a frame in a wireless communication system is provided. In the method, a plurality of preamble symbols are disposed. Then, a signal symbol is disposed at a predetermined position among the plurality of preamble symbols. At least one of data symbols is disposed after the plurality of preamble symbols. | 06-04-2009 |
20090154382 | MEDIUM ACCESS CONTROL DEVICE FOR PROCESSING DATA AT HIGH SPEED AND METHOD THEREOF - Provide are a medium access control MAC device for processing data at a high speed and a method thereof. The MAC device includes a packet receiving and processing unit for receiving packet data transmitted from a physical layer device and extracting data and data information from the received packet data by processing the received packet data; a data multiprocessing unit for sequentially multiplexing the extracted data and storing the extracted data in a first memory; and a data arranging unit for arranging the stored data in sequence number order using addresses of the first memory and the extracted data information, and transmitting the arranged data to an upper layer interface. | 06-18-2009 |
20090154405 | MEDIUM ACCESS CONTROL METHOD AND DATA TRANSMISSION METHOD USING THE SAME IN WIRELESS LOCAL AREA NETWORK - Provided are a MAC method and a method for transmitting data using the same in a WLAN. The MAC method includes: transmitting a bandwidth scheduling report frame for informing information on downlinks and uplinks allocated to a terminal by including the bandwidth scheduling report frame in one of the downlinks where the bandwidth scheduling report frame includes a plurality of downlinks, a plurality of uplinks, and a plurality of short uplinks and the number of the plurality of downlinks is equal to the number of the plurality of uplinks; receiving a bandwidth request frame for requesting bandwidth allocation through one of the uplinks; and allocating a bandwidth to each of the terminals by an unit of the downlink and the uplink. | 06-18-2009 |
20100118816 | APPARATUS AND METHOD FOR TRANSMITTING DATA IN WIRELESS COMMUNICATION SYSTEM - An apparatus for transmitting in a wireless communication system includes: a frame generating unit configured to generate a frame based on user data and to transmit the frame and frame information; a scheduling unit configured to generate a schedule of the frames to be transmitted on a frame-by-frame basis based on the frame information and to transmit the schedule; and a data matching unit configured to match the frames based on the schedule so as to transmit the frames at a time. | 05-13-2010 |
20100128688 | DATA TRANSMISSION/RECEPTION METHOD IN WIRELESS COMMUNICATION SYSTEM, AND DATA TRANSMITTER AND DATA RECEIVER USING THE SAME - A data transmission method includes: deciding the priority of data; deciding a channel priority based on a channel state; selecting a modulation and coding scheme (MCS) for the data based on the priority of data; selecting a transmission channel through which the data is to be transmitted, based on the channel priority; and modulating and coding the data in accordance with the selected MCS, and transmitting the modulated and coded data through the selected transmission channel. | 05-27-2010 |
20100150278 | RECEIVER FOR HIGH-SPEED WIRELESS COMMUNICATION SYSTEM AND CONTROL METHOD THEREOF - An apparatus for reducing power consumption of a receiver in a high-speed wireless communication system and a control method thereof are provided. The apparatus for processing a signal in a receiver of a wireless communication system includes a carrier sensor configured to sense a carrier used in the wireless communication system, a decoder configured to decode the detected carrier signal to a signal and data, and a controller configured to control supplying power and a clock only to the carrier sensor during carrier sensing, and supplying power and a clock to an overall receiver when a carrier is sensed. | 06-17-2010 |
20110141955 | METHOD AND APPARATUS FOR TRANSMITTING PACKET IN WIRELESS COMMUNICATION SYSTEM - Provided is a method and apparatus for transmitting a packet in a wireless communication system. A method for transmitting a packet by a packet transmission apparatus in a wireless communication system includes determining whether the packet is a response packet, and transmitting the packet with a higher channel access opportunity than another packet transmission apparatus of the wireless communication system, if the packet is a response packet. | 06-16-2011 |