Patent application number | Description | Published |
20080198788 | Hybrid automatic repeat request system and method thereof in a communication system - A method to transmit a packet of a BS in a communication system using a HARQ scheme is provided. The method includes assigning resource for transmitting a packet to a mobile station, and transmitting a first packet to the mobile station using the assigned resource; transmitting timing information on which a second packet is transmitted to the mobile station when the BS does not receive information indicating that the mobile station decoded the first packet successfully or when the BS receives information indicating that the mobile station failed to decode the first packet; and transmitting the second packet to the mobile station on a timing point corresponding to the timing information. | 08-21-2008 |
20080205260 | SYSTEM AND METHOD FOR TRANSMITTING DATA BURSTS IN COMMUNICATION SYSTEMS - Disclosed is a method for transmitting data bursts by a base station in a communication system, including forming one group which includes at least one subchannel and transmitting at least two data bursts having an equal transmission characteristic through each subchannel included in the group. | 08-28-2008 |
20080205364 | METHOD AND SYSTEM FOR CONFIGURING A FRAME IN A COMMUNICATION SYSTEM - A method and system for configuring a frame in a communication system is provided. The method includes determining a number of frames for configuring one multi-frame, wherein the number is at least two, and configuring each of the determined number of frames, wherein the determined number of frames include a first frame and a second frame temporally discriminated from each other, each of the determined number of frames includes a downlink sub-frame and an uplink sub-frame, a downlink sub-frame of the first frame includes a first area for transmitting a reference signal used for an acquisition of synchronization between a base station and a mobile station, a second area including system information and common control information related to the multi-frame, a third area including modulation scheme information and allocation information of data bursts, a fourth area to which a downlink data burst is allocated in a diversity mode and a fifth area to which a downlink data burst is allocated in a band Adaptive Modulation and Coding (AMC) mode, and a downlink sub-frame of the second frame includes a sixth area including modulation scheme information and allocation information of data bursts, a seventh area to which a data burst is allocated in a diversity mode, and an eighth area to which a data burst is allocated in an AMC mode. | 08-28-2008 |
20080207117 | APPARATUS AND METHOD FOR SELECTING A RELAY MODE IN A MULTIHOP RELAY BROADBAND WIRELESS COMMUNICATION SYSTEM - An apparatus and a method for selecting one of a plurality of relay modes in a wireless communication system are provided. The method includes checking a channel state between a Mobile Station (MS) and each of at least one Relay Station (RS), selecting the relay mode for supporting a relay service using the determined channel state between the MA and each of the at least one RS, and providing the relay service to the MS using the selected relay mode. Thus, system throughput and outage performance can be enhanced by using the appropriate relay mode based on the MS distribution or the channel condition. | 08-28-2008 |
20080212549 | Apparatus and method for receiving signal in a communication system - A signal reception method and apparatus for a communication system. One input unit and d | 09-04-2008 |
20080219217 | Method and system for transmitting and receiving data in a heterogeneous communication system - A method and system for transmitting/receiving data in a heterogeneous communication system. A terminal accesses a first controller of a first communication system supporting a first communication service to make a communication path to the first communication system. After making the communication path to the terminal, the first controller determines whether it is possible to provide the first communication service to the terminal over the first communication system. If it is not possible, the first controller transmits to an interworking unit a first request indicating that the terminal requires the first communication service over the second communication system. The interworking unit transmits a second request to a second controller of the second communication system in response to the first request, the second request indicating that the second controller provides the first communication service to the terminal. Upon receiving a response to the second request, the interworking unit controls the first controller to provide the first communication service to the terminal over the second communication system according to the response. | 09-11-2008 |
20080219324 | METHOD AND APPARATUS FOR GENERATING A HOPPING SEQUENCE IN A COMMUNICATION SYSTEM - A method and apparatus for generating a hopping sequence according to a seed value in a communication system are provided. The apparatus and method for generating a hopping sequence indicating a hopping pattern of carrier frequencies or time slots in a communication system include, when a seed value is input, setting a window to be applied to the seed value, calculating a window value according to the set window and generating a sequence by storing values in sequence arrangement to the calculated window value. The apparatus and method reduce the necessary size of a memory unit for storing a hopping sequence. | 09-11-2008 |
20080219375 | APPARATUS AND METHOD FOR SPATIAL MULTIPLEXING WITH BACKWARD COMPATIBILITY IN A MULTIPLE INPUT MULTIPLE OUTPUT WIRELESS COMMUNICATION SYSTEM - An apparatus and method for supporting both a receiver using a single antenna and a receiver using multiple antennas in a Multiple Input Multiple Output (MIMO) wireless communication system are provided. The apparatus and method in a MIMO wireless communication system include a first synthesizer for generating a first Transmit (Tx) signal by adding a first signal and a second signal, a second synthesizer for generating a second Tx signal by subtracting the second signal from the first signal and a plurality of transmitting units for transmitting the first Tx signal and the second Tx signal through corresponding antennas. Accordingly, receivers having either a single antenna or multiple antennas may be employed in the same communication system. | 09-11-2008 |
20080219415 | APPARATUS AND METHOD FOR PROVIDING A VOICE MESSAGE IN A COMMUNICATION SYSTEM - A method and apparatus for providing a voice message in a communication system are provided. Upon receiving a request message for providing a voice message to a calling terminal, a caller information detector determines whether the request message includes language select information indicating a language of a voice message to be provided to the calling terminal, and detects caller information included in the request message when the language select information is not included. A voice message reproducer selects a language of a voice message to be provided to the calling terminal using the detected caller information, and transmits a voice message corresponding to the selected language to the calling terminal. Accordingly, the calling terminal can receive voice messages in a language appropriate for the user. | 09-11-2008 |
20080225789 | System and method for allocating resources in a communication system - A method and system for allocating resources in a communication system including a first system having a use right for a plurality of frequency bands, and a second system having no use right for the plurality of frequency bands. The method includes acquiring first, second and third sensing informations indicating frequency bands available by a base station, a relay station and a mobile station belonging to the second system, among the plurality of frequency bands; and selecting a frequency band to be allocated for communications, based on the acquired sensing informations. | 09-18-2008 |
20080225983 | APPARATUS AND METHOD FOR SELECTING A MULTI-ANTENNA TRANSMISSION METHOD IN A BROADCASTING SYSTEM - An apparatus and a method for transmitting broadcasting signals in a broadcasting system having multi-antenna are provided. The apparatus comprises at least one antenna, a signal generator for generating two or more broadcasting signals to be transmitted, at least two of the two or more broadcasting signals being generated according to different user-required quality characteristics, a multi-antenna modulator for modulating each of the broadcasting signals according to one of a plurality of multi-antenna transmission methods selected for each of the broadcasting signals according to the user-required quality characteristics of the respective broadcasting signals, and a transmitter for transmitting the modulated signals via the at least one antenna. | 09-18-2008 |
20080232343 | Apparatus and method for estimating uplink frequency offset in wireless communication system - Provided is an apparatus and method for estimating an uplink frequency offset in a wireless communication system. In a receiving apparatus of a wireless communication system using a random access channel composed of two equivalent sequences, the apparatus includes a channel receiver which extracts samples corresponding to the two sequences from an input random access channel signal; a correlator which computes first and second correlation values by correlating preceding and trailing samples among the samples output from the channel receiver with a predetermined sequence; and a frequency offset estimator which estimates a frequency offset by using a ratio of the second correlation value to the first correlation value output from the correlator. | 09-25-2008 |
20080250305 | Method for generating non-binary structured low density parity check code - A method for generating a non-binary Low Density Parity Check (LDPC) code. The method includes generating non-binary identity matrixes so as to satisfy at least one condition, wherein the non-binary LDPC code is defined by a parity check matrix, and the parity check matrix includes a plurality of sub-matrixes, which are divided into zero matrixes and the non-binary identity matrixes. | 10-09-2008 |
20080263431 | Apparatus and method for transmitting and receiving signal in a communication system - An apparatus and method for transmitting and receiving a signal in a communication system are provided. The signal transmission apparatus generates a parity check matrix for an LDPC code in accordance with a code rate to be used and generates a codeword vector by encoding an information vector using the parity check matrix. When the code rate is a first code rate, the signal transmission apparatus generates a first parity check matrix as the parity check matrix for the LDPC code. When the code rate is the second code rate, the signal transmission apparatus generates a second parity check matrix supporting a second code rate lower than the first code rate by adding columns of a degree of 1 and columns of a degree of 2 to the first parity check matrix and generates the second parity check matrix as the parity check matrix for the LDPC code. | 10-23-2008 |
20080288846 | APPARATUS AND METHOD FOR ENCODING AND DECODING BLOCK LOW DENSITY PARITY CHECK CODES WITH A VARIABLE CODING RATE - An apparatus and method for coding a block Low Density Parity Check (LDPC) code having a variable coding rate. The apparatus receives an information word and encodes the information word into a block LDPC code based on one of a first parity check matrix and a second parity check matrix, depending on a coding rate to be applied when generating the information word into the block LDPC code. | 11-20-2008 |
20080317151 | Apparatus and method for forming subchannel in a communication system - A method for forming a subchannel in a communication system where a first communication system and a second communication system coexist. The method includes determining a first tile set by arranging first tiles remaining after forming at least one first subchannel for the first communication system among frequency resources, including a plurality of tiles, available for the first communication system; determining a second tile set by inserting second tiles which are independent of the frequency resources and are available for the second communication system into the determined first tile set at predetermined positions; forming at least one second subchannel for the second communication system by selecting a predetermined number of tiles from the second tile set; and performing communication using at least one of the first subchannel and the second subchannel. | 12-25-2008 |
20080317156 | METHOD AND APAPRATUS FOR REDUCING UPDATING RATE OF CHANNEL STATUS IN A COMMUNICATION SYSTEM - A method and apparatus for reducing a channel updating rate in a communication system are provided, in which a channel matrix H representing a channel status of physical channels is acquired, eigenvectors of the channel matrix H are output by a Singular Value Decomposition (SVD) of the channel matrix H, and when at least one of the eigenvectors has a phase inversion, the phase inversion is removed from the eigenvector. | 12-25-2008 |
20090303969 | Apparatus and method for employing common control channel and broadcast channel in a broadband wireless communication system with frequency overlay - A broadband wireless communication system supporting frequency overlay is provided. Operations of a base station includes checking whether it is time to transmit a common control signal; switching positions of a first Common Control Channel and a second Common Control Channel applied to a previous transmission of the common control signal while mapping a common control signal to the first Common Control Channel and the second Common Control Channel positioned in different Frequency Assignments; and transmitting the common control signal via the first Common Control Channel and the second Common Control Channel that are switched. | 12-10-2009 |
20100053079 | REMOTE CONTROL SYSTEM INCLUDING A DISPLAY PANEL AND A TERMINAL FOR REMOTE-CONTROLLING THE DISPLAY PANEL, AND REMOTE CONTROL METHOD IN THE REMOTE CONTROL SYSTEM - Disclosed are a remote control method in a remote control system including a display panel, and a terminal for remote-controlling the display panel, and the remote control system. The remote control system includes a terminal for transmitting a light signal to a point on the screen of a display panel according to user input, and a display panel for executing an operation corresponding to the light signal received point. | 03-04-2010 |
20100054755 | METHOD AND APPARATUS FOR OPTICAL COMMUNICATION USING A RETRO-REFLECTOR - An optical communication apparatus includes an optical signal transmitting unit to output an optical signal; an optical signal receiving unit to receive an optical signal; a retro-reflector to retro-reflect the received optical signal in a direction opposite to an incident angle of the received optical signal; and a control unit to direct the retro-reflector to receive the optical signal and to retro-reflect a response signal, which includes the received optical signal and data to be transmitted, in response to the received optical signal. | 03-04-2010 |
20110110440 | METHOD AND APPARATUS FOR CHANGING FREQUENCY BAND USED FOR COMMUNICATION BETWEEN DEVICES SUPPORTING MULTIPLE FREQUENCY BANDS - A method and apparatus for changing a frequency band used for communication between first and second devices supporting multiple frequency bands. The method includes transmitting a frequency band change request frame including information regarding a communication capability of the first device and a frequency band change request for requesting to change a frequency band currently being used for communication between the first and second devices, to the second device; receiving a frequency band change response frame corresponding to the frequency band change request frame, from the second device; and selectively changing the frequency band currently being used to another frequency band based on the received frequency band change response frame. | 05-12-2011 |
20110142122 | METHOD AND APPARATUS FOR TRANSMITTING VIDEO CONTENTS COMPRESSED BY CODEC - A method and apparatus for transmitting compressed video content are provided. The method includes transmitting a codec selection request frame, the codec selection request frame including an identifier of one or more codecs to be used to compress video content and requesting approval of the use of the codec, receiving a codec selection response frame, the codec selection response frame including result information indicating whether the use of the codec is approved, and transmitting video content frames for the video content compressed by the approved codec based on the codec selection response frame. Each video content frame includes frame type information indicating a type of compression applied to the video content included in the video content frame. | 06-16-2011 |
20110206004 | METHOD AND APPARATUS FOR PERFORMING HAND-OVER - A method of performing hand-over in a personal basic service set (PBSS) including a plurality of stations and one coordinator is provided. An association request frame comprising PCP capability information, and requesting to associate to the PBSS, is received from each of the stations. The PCP capability information comprises information regarding at least one of whether each of the stations supports a power source capability of continuous power supply, whether each of the stations supports a channel time allocation function, and whether each of the stations supports a network clustering function. An association response frame, indicating whether the association request received from each of the stations is approved, is transmitted to each of the stations, and a priority to be a coordinator of the stations is determined based on the PCP capability information. Hand-over is performed with one of the stations according to the determined priority. | 08-25-2011 |
20110206128 | METHOD AND APPARATUS FOR TRANSMITTING VIDEO CONTENT COMPRESSED BY CODEC - A method and apparatus of transmitting video content compressed by a codec to a second device is provided. The method includes: transmitting a codec selection request frame to the second device, the codec selection request frame includes an identifier of at least one codec to be used to compress the video content and requests approval of the use of the at least one codec; receiving a codec selection response frame from the second device, the codec selection response frame includes approval information indicating whether the use of the at least one codec is approved; and transmitting video content compressed by the at least one codec to the second device based on the codec selection response frame. | 08-25-2011 |
20110207460 | METHOD AND APPARATUS FOR PERFORMING HANDOVER - A method of performing a handover between a first device and a second device is provided. The method including: transmitting a handover request frame for requesting a handover, including information about a reason for requesting the handover, to the second device; receiving a handover response frame including handover request result information indicating whether the handover request is accepted, from the second device; and selectively performing the handover with the second device based on the handover response frame. | 08-25-2011 |
20140112309 | METHOD AND APPARATUS FOR PERFORMING HAND-OVER - A method of performing hand-over in a personal basic service set (PBSS) including a plurality of stations and one coordinator is provided. An association request frame comprising PCP capability information, and requesting to associate to the PBSS, is received from each of the stations. The PCP capability information comprises information regarding at least one of whether each of the stations supports a power source capability of continuous power supply, whether each of the stations supports a channel time allocation function, and whether each of the stations supports a network clustering function. An association response frame, indicating whether the association request received from each of the stations is approved, is transmitted to each of the stations, and a priority to be a coordinator of the stations is determined based on the PCP capability information. Hand-over is performed with one of the stations according to the determined priority. | 04-24-2014 |