Patent application number | Description | Published |
20090274235 | Data transmission method using dirty paper coding in mimo system - A data transmission method for multiple users having multiple receive antennas is provided. The method includes selecting a receive antenna among the multiple receive antennas for each user, performing DPC (Dirty Paper Coding) from the multiple transmit antennas to the receive antenna and transmitting a transmission signal on which the DPC is performed. Since DPC is implemented through a receive antenna selected among multiple receive antennas, complexity is not much increased although the DPC is applied to a MIMO system. | 11-05-2009 |
20090323840 | METHOD OF TRANSMITTING CODEBOOK INDEX IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting a codebook index in a wireless communication system includes receiving a feedback index regarding an entity selected from a plurality of entities belonging to a feedback codebook, selecting a precoder from a precoding codebook using the feedback index, the precoding codebook comprising a plurality of precoders and transmitting a precoder index of the selected precoder. Flexibility can be given to codebook designs, and overhead due to the feedback of codebook indices can be reduced. | 12-31-2009 |
20100027487 | Method for transmitting data in wireless communication system - A method for transmitting data in a wireless communication system provides transmitting a cluster allocation message, which informs at least one user equipment that the user equipment belongs to a cluster, to the at least one user equipment, and receiving a response to the cluster allocation message from user equipments belonging to the cluster. Small envelope correlation coefficient can be obtained without increasing the size of a user equipment. | 02-04-2010 |
20100067616 | METHOD OF TRANSMITTING CONTROL INFORMATION IN MULTIPLE ANTENNA SYSTEM - A method of transmitting control information in a multiple antenna system includes obtaining a channel quality indicator (CQI) of a first layer, obtaining a differential value between a CQI of a second layer and the CQI of the first layer, transmitting the CQI of the first layer, and transmitting the differential value. | 03-18-2010 |
20100103886 | METHOD FOR TRANSMITTING CONTROL SIGNALS IN A WIRELESS COMMUNICATION SYSTEM - A method of transmitting control signals includes configuring a multiplexing indicator indicating that a plurality of control signals are multiplexed on a control channel, generating a multiplexed control signal by multiplexing a first control signal and a second control signal according to the multiplexing indicator and transmitting the multiplexed control signal on the control channel. Overhead due to control signaling can be reduced by transmitting a multiplexed control signal on a control channel. | 04-29-2010 |
20100124194 | METHOD OF TRANSMITTING BROADCAST INFORMATION IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting broadcast information in a wireless communication system includes transmitting broadcast information and receiving an ACK (Acknowledgement)/NACK (Not-Acknowledgement) signal on an uplink channel from at least one mobile station in a cell, the ACK/NACK signal indicating whether the broadcast information is successfully received or not. A base station can know whether mobile stations successfully receive broadcast information or not and perform various operations to improve a reception rate of the broadcast information based on the result. | 05-20-2010 |
20100124195 | METHOD OF TRANSMITTING CONTROL SIGNAL IN A WIRELESS COMMUNICATION SYSTEM - A method of transmitting a control signal in wireless communication system includes generating a multiplexed control signal by multiplexing a first control signal and a second control signal, and transmitting the multiplexed control signal on a control channel. Overhead due to control signaling can be reduced by transmitting or receiving a multiplexed control signal through one channel. | 05-20-2010 |
20100208672 | Method of Allocating Uplink Radio Resource - A method of allocating an uplink radio resource includes transmitting a scheduling request signal for requesting allocation of the uplink radio resource, wherein the scheduling request signal comprises control information, a request of the allocation of the uplink radio resource is represented by transmitting the scheduling request signal and the control information is represented by a value of the scheduling request signal, and receiving a scheduling grant message in response to the scheduling request signal. | 08-19-2010 |
20100239046 | Method of Transmitting Data Using Repetition Coding - A method of transmitting data in a wireless communication system is provided. The method includes generating duplicate data by using repetition coding, the duplicate data being the same as original data, shifting the phase of the duplicate data, and transmitting the original data and the phase-shifted duplicate data. The duplicate data is mapped to a modulation symbol having a different size or phase as that of the original data, thus to reduce the PAPR unlike the general repetition coding. | 09-23-2010 |
20100248766 | METHOD OF ALLOCATING RADIO RESOURCES - A method of allocating radio resources includes allocating radio resources to a first allocation unit which is one of a plurality of allocation units included in a resource domain, and allocating radio resources to a second allocation unit at the m th position in a time domain and at the n th position in a frequency domain from the first allocation unit, wherein the resource domain includes a plurality of allocation unit groups, the plurality of allocation unit groups are composed the plurality of allocation units placed m in the time domain and n in the frequency domain from a previous allocation unit. | 09-30-2010 |
20100254272 | METHOD OF TRANSMITTING CHANNEL QUALITY INDICATOR - A method of transmitting channel quality indicator (CQI) includes obtaining CQI of each, of the plurality of sub-bands, selecting a first sub-band having the best CQI of the plurality of sub- bands, transmitting the best CQI of the first sub-band at a first transmission cycle and transmitting a difference value between the best CQI of the first sub-band and a CQI of the first sub-band at a second transmission cycle. Signalling overhead due to CQI transmission can be reduced. | 10-07-2010 |
20110019764 | Method of Data Transmission in Multiple Antenna System - A method of data transmission includes determining the number of layers, generating mapping symbols by mapping modulation symbols for a first codeword and modulation symbols for a second codeword to each layer, and transmitting the mapping symbols through a plurality of antennas. At least one of the first codeword and the second codeword is mapped to at least 3 layers and the number of layers is larger than 3. | 01-27-2011 |
20110103341 | Apparatus and Method for Data Transmission Using Transmit Diversity in SC-FDMA - An apparatus for data transmission is provided. The apparatus includes a data processor encoding an information bit and generating a modulation symbol by performing constellation mapping on the encoded information bit, a discrete Fourier transform (DFT) unit performing DFT on the modulation symbol to generate a frequency-domain symbol, a space time block coding (STBC) processor performing STBC on the frequency-domain symbol to generate an STBC code consisting of 1st and 2nd STBC streams, a subcarrier mapper mapping the 1st STBC stream to a 1st subcarrier and mapping the 2nd STBC stream to a 2nd subcarrier, an inverse fast Fourier transform (IFFT) unit performing IFFT on the 1st subcarrier to generate a 1st single carrier-frequency division multiple access (SC-FDMA) symbol and performing IFFT on the 2nd subcarrier to generate a 2nd SC-FDMA symbol, and a plurality of transmit antennas transmitting the 1st and 2nd SC-FDMA symbols. STBC is effectively applied to a SC-FDMA system to decrease a peak-to-average power ratio (PAPR) and to maintain a single-carrier property. | 05-05-2011 |
20110110307 | DATA TRANSMISSION APPARATUS USING MULTIPLE ANTENNAS AND METHOD THEREOF - An apparatus for transmitting data includes a data processing unit for generating a data symbol by channel-coding and constellation-mapping on information bits, a Discrete Fourier Transform (DFT) unit for generating a frequency domain symbol by performing DFT on the data symbols, a Multiple-Input Multiple-Output (MIMO) processing unit for generating a first transmission symbol by applying a first transmission diversity scheme to the frequency domain symbol and generating a second transmission symbol by applying a second transmission diversity scheme to the first transmission symbol, a Single Carrier-Frequency Division Multiple Access (SC-FDMA) modulation unit for generating an SC-FDMA symbol by performing Inverse Fast Fourier Transform (IFFT) on the first transmission symbol and the second transmission symbol, and a plurality of transmission antennas for sending the SC-FDMA symbol. | 05-12-2011 |
20110116572 | METHOD AND APPARATUS FOR TRANSMITTING REFERENCE SIGNAL IN MULTIPLE ANTENNA SYSTEM - A method and an apparatus for transmitting a reference signal in a multiple antenna system are provided. The method includes transmitting a common reference signal through N antennas (N05-19-2011 | |
20110117943 | METHOD OF ALLOCATING RADIO RESOURCE IN WIRELESS COMMUNICATION SYSTEM - A method of allocating radio resources in a wireless communication system includes dividing the overall frequency band into a plurality of frequency blocks including at least one subcarrier in a frequency domain, and allocating an allocation unit including some of the plurality of frequency blocks to a user equipment (ITE), wherein the allocation unit is any one of a localized allocation unit including frequency blocks contiguous in the frequency domain and a distributed allocation unit including frequency blocks distributed in the frequency domain. Allocation schemes of subcarriers are freely used suitably according to channel environments of users, the scheduling effect of radio resources can be enhanced. | 05-19-2011 |
20110134849 | METHOD AND APPARATUS FOR TRANSMITTING SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method and an apparatus for transmitting data in a wireless communication system are provided. The method includes receiving cyclic shift information indicating a first cyclic shift value, obtaining a second cyclic shift value from the first cyclic shift value, transmitting a first signal based on the first cyclic shift value through a first antenna, and transmitting a second signal based on the second cyclic shift value through a second antenna, wherein the first signal and the second signal are transmitted on the same radio resource. | 06-09-2011 |
20110134868 | METHOD AND APPARATUS OF TRANSMITTING DATA IN MULTIPLE RF SYSTEM - A method and an apparatus of transmitting data in a multi-radio frequency (RF) system are provided. The method includes transmitting first data through a first physical channel to a first base station (BS), transmitting second data through a second physical channel to a second BS, wherein the first data and the second data are simultaneously transmitted. | 06-09-2011 |
20110134902 | METHOD OF TRANSMITTING DATA USING SPATIAL MULTIPLEXING - A data transmission method using spatial multiplexing is disclosed. The data transmission method using spatial multiplexing includes modulating at least one codeword to generate at least one modulation symbol, mapping the at least one modulation symbol to a layer whose number is determined according to its rank to generate a layer-mapped symbol stream, performing discrete Fourier transform (DFT) on the layer-mapped symbol stream to generate a frequency domain symbol stream, performing precoding on the frequency domain symbol stream, mapping the precoded frequency domain symbol stream to subcarriers, and then performing inverse fast Fourier transform (IFFT) on the precoded frequency domain symbol stream-mapped subcarriers to generate SC-FDMA symbols; and transmitting the SC-FDMA symbols by using a plurality of transmission antennas. Spatial multiplexing having a low PAPR can be possibly performed in an SC-FDMA system. | 06-09-2011 |
20110134903 | APPARATUS AND METHOD FOR DATA TRANSMISSION USING TRANSMISSION DIVERSITY IN SC-FDMA SYSTEM - Disclosed is a data transmission apparatus for providing transmission diversity in an SC-FDMA (Single Carrier-Frequency Division Multiple Access) system. The data transmission apparatus comprises: a data processor, which performs coding and modulation on an information bit to generate a data symbol; an SC-FDMA processor, which changes a weight matrix per change-cycle, precodes the data symbol for each weight matrix being changed and performs SC-FDMA modulation for generating an SC-FDMA symbol; and an RF unit, which transmits the SC-FDMA symbol. With the application of a PVS method to the SC-FDMA system, not only can transmission diversity be provided, but PAPR can also be reduced and single-carrier properties can be maintained. | 06-09-2011 |
20110141941 | Method and Apparatus of Transmitting Control Information in Wireless Communication System - A method and an apparatus of transmitting control information in a wireless communication systema are provided. The method includes transmitting first control information and second control information through an uplink component carrier (UL CC), wherein the first control information is for a first downlink component carrier (DL CC), and the second control information is for a second DL CC. | 06-16-2011 |
20110142000 | METHOD AND APPARATUS FOR THE TRANSMISSION OF A CONTROL SIGNAL IN A RADIO COMMUNICATION SYSTEM - The present invention provides a method and an apparatus for the transmission of control signal in a radio communication system. The method includes the steps of processing first control information on the basis of a first resource index to create a first control signal, processing second control information on the basis of a second resource index to create a second control signal, and transmitting the first control signal and the second control signal. | 06-16-2011 |
20110142001 | METHOD FOR TRANSMITTING MULTIPLE CODE WORDS IN A MULTIPLE ANTENNA SYSTEM - Provided is a method of sending multiple codewords in a wireless communication system using a plurality of transmitting antennas. The method includes the steps of encoding a plurality of parallel information bit streams to generate a plurality of parallel codewords; modulating the plurality of parallel codewords to generate a plurality of parallel modulated symbol streams; performing a DFT (Discrete Fourier Transform) on the modulated symbol streams to generate a plurality of frequency domain symbol streams; performing a pre-coding process on the plurality of frequency domain symbol streams; mapping the plurality of precoded frequency domain symbol streams to resource elements; performing an IFFT (Inverse Fast Fourier Transform) on the plurality of frequency domain symbol streams to generate SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols; performing shifting, at a predetermined time interval, on layers at which the plurality of parallel codewords, the plurality of parallel modulated symbol streams, or the plurality of frequency domain symbol streams; and transmitting the SC-FDMA symbol. | 06-16-2011 |
20110142076 | DATA TRANSMISSION METHOD USING STBC SCHEME - A data transmission method using a space time block code (STBC) scheme is provided. The method includes generating a modulation symbol by performing coding and constellation mapping on an information bit, generating a frequency-domain symbol by performing discrete Fourier transform (DFT) on the modulation symbol, generating a single carrier-frequency division multiple access (SC-FDMA) symbol by performing inverse fast Fourier transform (IFFT) after mapping the frequency-domain symbol to a subcarrier, and transmitting the SC-FDMA symbol on a slot basis. | 06-16-2011 |
20110143796 | METHOD AND APPARATUS OF MONITORING PDCCH IN WIRELESS COMMUNICATION SYSTEM - A method and an apparatus of monitoring a physical downlink control channel (PDCCH) in a wireless communication system, carried in a user equipment (UE), are provided. The method includes receiving a PDCCH map, and monitoring a set of PDCCH candidates based on the PDCCH map. | 06-16-2011 |
20110149944 | APPARATUS AND METHOD FOR DATA TRANSMISSION IN SC-FDMA SYSTEM WITH MULTIPLE ANTENNAS - According to an aspect of the present invention, an apparatus for data transmission is provided. The apparatus includes a data processing unit generating a data symbol by performing channel coding and constellation mapping on an information bit, a single carrier-frequency division multiple access (SC-FDMA) modulator generating an SC-FDMA symbol by performing discrete Fourier transform (DFT) on the data symbol, by mapping the DFT performed-data symbol to subcarriers, and by performing inverse fast Fourier transform (IFFT) on the subcarrier mapped-DFT performed-data symbol, and a plurality of transmit antennas transmitting the SC-FDMA symbol. A single carrier-frequency division multiple access (SC-FDMA) system can effectively use frequency switched transmit diversity (FSTD) to reduce a peak-to-average power ratio (PAPR) and to maintain a single-carrier property. | 06-23-2011 |
20110158345 | PILOT TRANSMISSION METHOD IN A WIRELESS COMMUNICATION SYSTEM - A pilot transmission method in a wireless communication system is provided. The method includes: transmitting a first pilot for channel measurement through a first transmission section; and transmitting a second pilot for channel measurement through a second transmission section which is subsequent in time to the first transmission section, wherein the first transmission section and the second transmission section include a plurality of sub-bands, parts of the plurality of sub-bands use predetermined precoding whereas the remaining sub-bands use non-predetermined precoding, and any one of the first pilot and the second pilot is carried only on a sub-band which uses the predetermined precoding whereas the other pilot is carried on the entirety of the plurality of sub-bands. | 06-30-2011 |
20110170629 | METHOD AND APPARATUS FOR TRANSMITTING REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method and an apparatus for transmitting a reference signal in a wireless communication system are provided. The method includes generating a first sequence and a second sequence, mapping the first sequence to reference symbols in a resource block, mapping the second sequence to the same reference symbols in the resource block, and transmitting a first reference signal (RS) based on the first sequence through a first antenna, and a second RS based on the second sequence through a second antenna. | 07-14-2011 |
20110194514 | METHOD AND APPARATUS OF RECEIVING DATA IN WIRELESS COMMUNICATION SYSTEM - A method and an apparatus of receiving data in a wireless communication system. The method includes receiving a downlink (DL) grant on a physical downlink control channel (PDCCH) through a first DL component carrier (CC), and receiving data based on the DL grant through a second DL CC. | 08-11-2011 |
20110194523 | METHOD AND DEVICE FOR WIRELESS SUBFRAME RESOURCE ALLOCATION - The method for wireless resource subframe allocation comprises the following steps: allocation of the control channel based on the first RAT (Radio Access Technology) of the first control domain, which includes the OFDM symbol of the first number from the sub-frame containing multiple OFDM symbols and multiple subcarriers in the frequency domain; allocation of the control channel based on the second RAT of the second control domain including the OFDM symbol of the second number which follows said first control domain; and the allocation of a data channel in the data domain which includes the OFDM symbols positioned outside said first control domain and second control domain. This invention provides a sub-frame structure which is compatible with existing wireless communication systems. This method allows the continued use of existing control channel systems or base signal structures. The method is also capable of supporting advanced features. | 08-11-2011 |
20110211539 | METHOD FOR TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM - A method of transmitting data in a multiple antenna system includes transmitting a precoding matrix index (PMI) of a first user through a control channel for the first user, and transmitting the PMI of the first user and a PMI of a second user through a data channel for the first user. Effective data decoding is possible regardless of whether radio resources to be allocated to multiple users are partially or entirely allocated to the users. | 09-01-2011 |
20110222588 | Apparatus and Method for Transmitting Data Using Transmission Diversity in Wireless Communication System - An apparatus for transmitting data in a wireless communication system is provided. The apparatus includes a data processor for generating modulation symbols by coding information bits and by constellation-mapping the coded information bits, a transmission (TX) processor for generating transmission symbols by applying any one of first and second transmission diversity schemes to the modulation symbols and for configuring a subframe including the transmission symbols, and a plurality of antennas for transmitting the subframe. The subframe comprises a plurality of slots and has a varying frequency band every slot by frequency hopping. | 09-15-2011 |
20110249629 | Method Of Transmitting Channel Information In Multiple Antenna System - A method of transmitting channel information in a multiple antenna system includes receiving the channel information comprising rank information, and transmitting a confirm message through a downlink control channel as a confirmation for the channel information, wherein the confirm message comprises overriding rank information which overrides the received rank information in an open loop scheme and also comprises information indicating whether the received channel information is used without alteration in a closed loop scheme. A rank indicator (RI) and a precoding matrix indicator (PMI) can be carried on a dedicated control channel (DCCH) and be specified through a physical downlink control channel (PDCCH). | 10-13-2011 |
20110299383 | METHOD FOR TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM - An apparatus for data transmission in a multi-antenna system is provided. The apparatus includes: a modulation mapper for modulating codewords into modulation symbols that express a position on a signal constellation; a layer permutator for mapping the modulation symbols to different layers; a transform precoder for generating a discrete Fourier transform (DFT) symbol of a frequency domain by performing DFT on the modulation symbol mapped to the layer; a resource element mapper for mapping the DFT symbol to a physical resource element; and a signal generator for generating a single carrier-frequency division multiple access (SC-FDMA) signal from the DFT symbol mapped to the resource element, wherein a modulation order of the modulation symbols is determined depending on the layer mapped by the layer permutator. | 12-08-2011 |
20110300870 | METHOD AND DEVICE FOR TRANSMITTING IWS IN A WIRELESS COMMUNICATION SYSTEM - Provided are a method and a device for transmitting an IWS (Inter-Working signal) of a femto base station in a wireless communication system. The femto base station generates a sequence of a preamble including information about a frequency band on which the femto base station operates, maps the IWS including the sequence of the preamble to a plurality of subcarriers on a frequency domain, and transmits the IWS to a terminal through the subcarriers. The IWS can be mapped to the plurality of subcarriers positioned on one equal OFDM (Orthogonal Frequency Division Multiplexing) symbol on a time domain or a plurality of preset RUs (Resource Unit). | 12-08-2011 |
20110305134 | METHOD AND APPARATUS FOR PERFORMING A HARQ OPERATION IN A MULTI-CARRIER SYSTEM - A method of performing hybrid automatic repeat request (HARQ) of a user equipment (UE) in a multiple-carrier system is provided. The UE transmits uplink data on an uplink carrier. The UE receives acknowledgement (ACK)/not-acknowledgement (NACK) for the uplink data on a downlink carrier associated with the uplink carrier. Accordingly, HARQ can be supported in a multiple-carrier system. | 12-15-2011 |
20120027004 | APPARATUS AND METHOD FOR TRANSMITTING DATA IN A MULTI-ANTENNA SYSTEM - An apparatus for transmitting data in a multi-antenna system is provided. The apparatus includes: a scrambling unit for performing scrambling on an input codeword; a modulator for arranging the scrambled codeword to a modulation symbol that expresses a position on a signal constellation; a transform precoder for performing discrete Fourier transform (DFT) on the modulation symbol to generate a DFT symbol of a frequency domain; a resource element mapper for mapping the DFT symbol to a physical resource element; and a single carrier-frequency division multiple access (SC-FDMA) signal generator for generating an SC-FDMA signal of a time domain from the DFT symbol mapped to the resource element, wherein the modulation symbol is selected in the time domain as a plurality of modulation symbol blocks, and the selected modulation symbol blocks are input to the transform precoder after being combined repetitively. | 02-02-2012 |
20120033588 | METHOD FOR PERFORMING A HARQ OPERATION IN A RADIO COMMUNICATIONS SYSTEM, AND METHOD AND APPARATUS FOR ALLOCATION OF SUBFRAMES - There is provided a method for allocating subframes in a radio communications system that performs communication by using a radio frame including a plurality of subframes, the method including: selecting a backhaul downlink subframe in which a base station is to transmit a signal to a relay station; and allocating the backhaul downlink subframe to a substitution subframe which is not limitation subframes, when the selected backhaul downlink subframe corresponds to one of the limitation subframes, wherein the limitation subframes are subframes in which the relay station is to transmit essential information to a relay user equipment. Therefore, it is possible to overcome a limitation that is present in a link between the base station and the relay station, perform an HARQ operation, and improve the efficiency of radio resource allocation. | 02-09-2012 |
20120250663 | Method and Device for Performing HARQ in a Multiple Antenna System - Disclosed are a method and a device for performing HARQ in a multiple antenna system. A terminal transmits uplink data via a plurality of antennas and through a Physical Uplink Shared Channel (PUSCH), and receives an ACK/NACK (Acknowledgement/Non-Acknowledgement) signal indicating whether or not the uplink data has been received, the signal being received via the plurality of antennas and through a PHICH (Physical Hybrid-ARQ Indicator Channel) which corresponds to the PUSCH. A downlink resource to which the PHICH is mapped is determined on the basis of the index (I | 10-04-2012 |
20140185552 | METHOD AND APPARATUS OF TRANSMITTING DATA IN MULTIPLE RF SYSTEM - A method and an apparatus of receiving data, the method carried in a user equipment (UE) configured to communicate with a first cell and a second cell, are provided. The method includes: receiving a first downlink data through a first downlink channel from the first cell, receiving a second downlink data through a second downlink channel from the second cell, and transmitting a data on a third channel, wherein the data transmitted on the third channel is related to a HARQ operation, and wherein the third channel is used to transmit the data related to the HARQ operation with respect to both the first data and the second data which have been received from the first and second cells, respectively. | 07-03-2014 |