Patent application number | Description | Published |
20090125774 | METHOD OF DATA TRANSMISSION USING HARQ - A method of transmitting data from a user terminal to a base station using a hybrid automatic repeat request (HARQ) scheme with a plurality of redundancy versions of said data, each of the redundancy versions (RV) indicating a transmission start position of a data block in a circular buffer is disclosed. For each retransmission, the redundancy version to be used by considering the previously used redundancy version and a predetermined sequence is determined. Within one sequence, at least two redundancy versions following each other have non consecutive start positions. | 05-14-2009 |
20090199066 | METHOD FOR DETERMINING TRANSPORT BLOCK SIZE AND SIGNAL TRANSMISSION METHOD USING THE SAME - A method for determining a transport block size and a signal transmission method using the same are disclosed. When the signal transmission method constructs a transport block size combination by predetermining the transport block size, it prevents the insertion of any dummy bits in consideration of the limitation of an input bit length of an encoder during an encoding step. If a CRC is attached to the transport block and the transport block is segmented into a plurality of code blocks, the signal transmission method can establish a length of the transport block in consideration of a length of the CRC attached to each code block. | 08-06-2009 |
20090290538 | METHOD OF TRANSMITTING CONTROL SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting a control signal in a wireless communication system is provided. The method includes acquiring a resource index, the number of cyclic shifts (CSs) and a CS interval, wherein the number of CSs is an integer multiple of the CS interval, determining a CS index based on the number of CSs and the CS interval, generating a cyclically shifted sequence by cyclically shifting a base sequence by a CS amount obtained from the CS index, generating a modulated sequence based on the cyclically shifted sequence and a symbol for a control signal and transmitting the modulated sequence after mapping the modulated sequence to a resource block obtained from the resource index. | 11-26-2009 |
20100002800 | Method and apparatus of transmitting reference signal for uplink transmission - A method and apparatus of transmitting a reference signal in a wireless communication system is provided. The method includes generating a precoded reference signal or a non-precoded reference signal in accordance with a rank, and transmitting the generated reference signal. Uplink transmission using multiple transmit antennas is supported through reference signal design and related control signaling. | 01-07-2010 |
20100041344 | Method for transmitting channel quality indicators - A method for transmitting Channel Quality Indicators (CQIs) of all carrier bands in a system using a plurality of carrier bands (legacy system bands) is disclosed. In order to provide sufficient information to a scheduler, the CQIs of all the carrier bands are generated and transmitted by the same method or a predetermined number of carrier bands are selected and only the CQIs of the selected carrier bands are transmitted. Thus, it is possible to efficiently control signal resources. By simply expanding the method for transmitting the CQIs of the carrier bands, it is possible to facilitate the expansion of the system. | 02-18-2010 |
20100054353 | LAYER MAPPING METHOD AND DATA TRANSMISSION METHOD FOR MIMO SYSTEM - A method for indicating a combination between a codeword and a layer in a MIMO communication, system, a layer mapping method, and a data transmission method using the same are disclosed. A minimum number of codeword-layer mapping combinations from among all available combinations based on the numbers of all codewords and all layers are pre-defined in consideration of a ratio of a codeword to a layer, a reception performance of a receiver, and reduction of combinations, so that a data transmission method using the predefined combinations is implemented. If a specific one codeword is mapped to at least two layers, a diversity gain can be acquired. | 03-04-2010 |
20100074305 | STBC based transmission method considering number of symbols in slot - An STBC based signal transmission method considering the number of symbols within a slot. In transmitting a signal using two or more transmission antennas in a mobile communication system using a structure in which one subframe includes two slots and each slot includes a plurality of symbols, transmission symbols are paired in units of two consecutive symbols within each subframe by an STBC scheme. The transmission symbols are mapped to a frequency region in units of slots and the mapped transmission symbols are transmitted. One symbol within a slot in which the number of symbols excluding symbols for transmitting a reference signal is an odd number is not paired by the STBC scheme. | 03-25-2010 |
20100077274 | Hybrid automatic repeat request and channel information feedback for relay - Operations of a relay are disclosed. To perform a hybrid automatic repeat request (HARQ), the relay receives a plurality of codewords from a base station and transmits a status indicator with respect to the plurality of codewords to the base station. The status indicator is a signal informing the base station about whether or not the configuration of an HARQ has been changed. Although a backhaul link and an access link are asymmetric, HARQ operation can be achieved. | 03-25-2010 |
20100103860 | Method of operating relay station in wireless communication system - A method of operating a relay station in a wireless communication system is provided. The method includes operating in a first mode comprising a first sub-mode and a second sub-mode, in the first sub-mode a first downlink and a first uplink between a base station and the relay station being simultaneously activated, in the second sub-mode a second downlink and a second uplink between the relay station and a mobile station being simultaneously activated, and operating in a second mode comprising a third sub-mode and a fourth sub-mode, in the third sub-mode the first downlink and the second uplink being simultaneously activated, in the fourth sub-mode the first uplink and the second downlink being simultaneously activated. | 04-29-2010 |
20100110982 | Method for transmitting channel quality information based on differential scheme - A method for transmitting channel quality information based on a differential scheme is disclosed. When channel quality information of a predetermined number of sub-bands selected by a receiver in a frequency selective channel is transmitted, total average channel information is transmitted. Channel information of the selected sub-bands is transmitted as sub-band differential information associated with average channel information. In this case, the sub-band differential information may be denoted by a specific value contained positive (+) values. If at least two channel quality information is transmitted by a MIMO system, channel quality information of one channel is transmitted, then channel quality information of the other channel is transmitted as spatial differential information. In this case, the spatial differential information is denoted by a specific value contained in a differential-value range asymmetrical on the basis of “ | 05-06-2010 |
20100195594 | METHOD FOR TRANSMITTING CODEWORDS IN MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM - A method for effectively transmitting/receiving a codeword in a MIMO system is disclosed. In a system including a plurality of predetermined rank structures, a reception end transmits rank information (RI), precoding matrix index (PMI), and channel quality information (CQI) of each codeword to a transmission end. The transmission end selects a rank structure on the basis of information received from the reception end. The transmission end selects only some codeword blocks among a plurality of codeword blocks available for the selected rank structure, transmits signals via the selected codeword blocks, and transmits a null signal for the non-selected codeword blocks. | 08-05-2010 |
20100211840 | METHOD FOR RETRANSMITTING IN THE MULTI-CARRIERS SYSTEM - A method for reducing retransmission overhead in a system based on the asynchronous channel-adaptive retransmission scheme is disclosed. If the possibility of performing data retransmission is high, the system provides a method for transmitting synchronous duration (SD) information. According to the method for transmitting the SD information, the system does not transmit scheduling information whenever receiving a retransmission request, and synchronously transmits data during a predetermined synchronous duration. Namely, the data can be retransmitted without using the scheduling information. | 08-19-2010 |
20100215114 | METHOD FOR TRANSMITTING SOUNDING REFERENCE SIGNAL IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - A method for transmitting a sounding reference signal in a MIMO wireless communication system and an apparatus therefor are disclosed. The method for transmitting sounding reference signals (SRSs) in a MIMO wireless communication system comprises receiving sounding reference signal parameters from a base station; receiving information of the number of sounding reference signals which will be transmitted at a transmission time instant from the base station; if a plurality of sounding reference signals are provided, generating the sounding reference signals corresponding to each of the plurality of antennas by using the sounding reference signal parameters; and transmitting the generated sounding reference signals to the base station through their corresponding antennas at a specific transmission instant. | 08-26-2010 |
20110033001 | Layer mapping method and data transmission method for MIMO system - A method for indicating a combination between a codeword and a layer in a MIMO communication system, a layer mapping method, and a data transmission method using the same are disclosed. A minimum number of codeword-layer mapping combinations from among all available combinations based on the numbers of all codewords and all layers are pre-defined in consideration of a ratio of a codeword to a layer, a reception performance of a receiver, and reduction of combinations, so that a data transmission method using the predefined combinations is implemented. If a specific one codeword is mapped to at least two layers, a diversity gain can be acquired. | 02-10-2011 |
20110080968 | METHOD FOR TRANSMITTING CHANNEL QUALITY INFORMATION IN A MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM - A method for transmitting a CQI in a MIMO system is disclosed. A method for allowing a receiver to feed back a CQI value to a transmitter in a Multiple Input Multiple Output (MIMO) system includes, receiving a transmission (Tx) pilot signal for each Tx antenna from a base station (BS), measuring a first CQI value of a first codeword and a second CQI value of a second codeword on the basis of the pilot signal, and transmitting the first CQI value of the first codeword and the second CQI value of the second codeword to the base station (BS), wherein at least one of the first and second CQI values includes specific information capable of indicating a transmission restriction status of a corresponding codeword. | 04-07-2011 |
20110110348 | METHOD AND APPARATUS FOR TRANSMITTING PLCP FRAME IN WIRELESS LOCAL AREA NETWORK SYSTEM - A method of transmitting a Physical Layer Convergence Procedure (PLCP) frame in a Very High Throughput (VHT) Wireless Local Area Network (WLAN) system includes generating a MAC Protocol Data Unit (MPDU) to be transmitted to a destination station (STA), generating a PLCP Protocol Data Unit (PPDU) by adding a PLCP header, including an L-SIG field containing control information for a legacy STA and a VHT-SIG field containing control information for a VHT STA, to the MPDU, and transmitting the PPDU to the destination STA. A constellation applied to some of Orthogonal Frequency Division Multiplex (OFDM) symbols of the VHT-SIG field is obtained by rotating a constellation applied to an OFDM symbol of the L-SIG field. | 05-12-2011 |
20110142020 | METHOD AND APPARATUS OF TRANSMITTING TRAINING SIGNAL IN WIRELESS LOCAL AREA NETWORK SYSTEM - A method of transmitting a training signal in a Wireless Local Area Network (WLAN) system includes generating one or more first training signals for a first destination station and one or more second training signals for a second destination station by applying a mapping matrix P to a training signal generation sequence, mapping the first training signals and the second training signals to a plurality of antennas according to an antenna mapping matrix, and performing Inverse Fast Fourier Transform (IFFT) on each of the first training signals and the second training signals mapped to the plurality of antennas and transmitting the training signals through the plurality of antennas. | 06-16-2011 |
20110235730 | METHOD FOR TRANSMITTING AND RECEIVING DOWNLINK REFERENCE SIGNALS IN A WIRELESS COMMUNICATION SYSTEM HAVING MULTIPLE ANTENNAS - A method for transmitting and receiving downlink Reference Signals (RSs) in a wireless communication system using multiple antennas is disclosed. The downlink RS transmission method includes transmitting a first Orthogonal Frequency Division Multiplexing (OFDM) symbol in which RSs for a plurality of antenna port of first group are allocated in a predetermined order along a frequency axis, RSs for a plurality of antenna port of second group are allocated in a predetermined order along the frequency axis, and the RSs for the plurality of antenna port of first group are multiplexed in Code Division Multiplexing (CDM) with the RSs for the plurality of antenna port of second group by pairing each of the plurality of antenna port of first group with one of the plurality of antenna port of second group, and transmitting a second OFDM symbol in which the RSs for the plurality of antenna port of first group and the RSs for the plurality of antenna port of second group are positioned in an RS pattern being a frequency-domain shift of an RS pattern of the first OFDM symbol. | 09-29-2011 |
20110244787 | METHOD AND APPARATUS FOR TRANSMITTING SCHEDULING REQUEST IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting a scheduling request in a wireless communication system is provided. The method includes: transmitting a scheduling request signal by a relay station to a base station in a first subframe; and transmitting data by the relay station to the base station in a second subframe, wherein the scheduling request signal includes allocation information on the second subframe in which the data is transmitted. Accordingly, data can be effective transmitted between the relay station and the base station in the wireless communication system. | 10-06-2011 |
20110261716 | METHOD AND APPARATUS OF TRANSMITTING SOUNDING REFERENCE SIGNAL IN MULTIPLE ANTENNA SYSTEM - A method and an apparatus of transmitting a sounding reference signal by a user equipment is provided. A user equipment transmits a first sounding reference signal through a first antenna, and transmits a second sounding reference signal through a second antenna. Resources for transmitting the first sounding reference signal and the second sounding reference signal are partially different. | 10-27-2011 |
20110300872 | METHOD OF CONFIGURING RADIO CONNECTION IN MULTIPLE CELL SYSTEM - A method of configuring a radio connection in a multiple cell system is provided. The method includes configuring a first radio connection between a user equipment (UE) and a primary base station (BS) and a second radio connection between the UE and a secondary BS based on a cooperative transmission configuration in which a plurality of BSs transmit the same data to the UE, receiving first channel state regarding the first radio connection and second channel state regarding the second radio connection from the UE, releasing at least one radio connection of the first radio connection and the second radio connection, the at least one radio connection having a worse channel state than a threshold, transmitting to the UE, a new cooperative transmission configuration changed by the release of the at least one radio connection, and receiving a layer reconfiguration complete message indicating completion of layer reconfiguration based on the new cooperative transmission configuration. | 12-08-2011 |
20120044925 | METHOD AND APPARATUS FOR TRANSMITTING A FRAME IN A WIRELESS RAN SYSTEM - There is provided a method and apparatus for transmitting a frame which is performed by a transmission STA in a WLAN system. The method of transmitting a frame according to the present invention includes generating an MAC Protocol Data Unit (MPDU) to be transmitted to a target station, generating a PLCP Protocol Data Unit (PPDU) by attaching a Physical Layer Convergence Procedure (PLCP) header to the MPDU, and transmitting the PPDU to the target station. The PLCP header comprises a partial Association ID (AID) of the target station. | 02-23-2012 |
20120069810 | METHOD FOR RECEIVING ACK/NACK SIGNAL IN MOBILE COMMUNICATION SYSTEM - A method for transmitting information of resources for use in transmission of ACK/NACK signals in a mobile communication system is disclosed. An example method for receiving ACK/NACK signals in a mobile communication system is also disclosed. When resources for transmission of data and resources for transmission of control information of the data are scheduled through virtual unit resources, the method identifies information of resources for receiving an ACK/NACK signal for transmission data mapped to information of at least one of a virtual unit resource allocated to the transmission data and a virtual unit resource allocated to control information of the transmission data, and receives the ACK/NACK signal for the transmission data through the information of resources for receiving the ACK/NACK signal. | 03-22-2012 |
20120082102 | METHOD FOR INDICATING PRECODING MATRIX INDICATOR IN UPLINK MIMO SYSTEM WITH BASED ON SC-FDMA - A method of transmitting PMI (precoding matrix indicator) information in an uplink MIMO system is disclosed. The present invention includes the steps of receiving channel information from a user equipment and transmitting information on a resource allocated to the user equipment in uplink transmission and PMI information indicating a precoding matrix to apply to a region of the resource among a plurality of precoding matrices to the user equipment based on the received channel information, wherein the resource allocated to the user equipment is allocated by a bundle unit of a prescribed number of subcarriers, wherein each of a plurality of the precoding matrices are applied to regions generated from dividing a whole frequency band into a prescribed number of regions, respectively, and wherein the precoding matrix applied to the resource among a plurality of the precoding matrices has a maximum area resulting from overlapping a frequency band occupied by the allocated resource with a frequency band having the precoding matrix applied thereto. | 04-05-2012 |
20120082112 | METHOD FOR RECEIVING ACK/NACK SIGNAL IN MOBILE COMMUNICATION SYSTEM - A method for transmitting information of resources for use in transmission of ACK/NACK signals in a mobile communication system is disclosed. An example method for receiving ACK/NACK signals in a mobile communication system is also disclosed. When resources for transmission of data and resources for transmission of control information of the data are scheduled through virtual unit resources, the method identifies information of resources for receiving an ACK/NACK signal for transmission data mapped to information of at least one of a virtual unit resource allocated to the transmission data and a virtual unit resource allocated to control information of the transmission data, and receives the ACK/NACK signal for the transmission data through the information of resources for receiving the ACK/NACK signal. | 04-05-2012 |
20120082113 | METHOD FOR RECEIVING ACK/NACK SIGNAL IN MOBILE COMMUNICATION SYSTEM - A method for transmitting information of resources for use in transmission of ACK/NACK signals in a mobile communication system is disclosed. An example method for receiving ACK/NACK signals in a mobile communication system is also disclosed. When resources for transmission of data and resources for transmission of control information of the data are scheduled through virtual unit resources, the method identifies information of resources for receiving an ACK/NACK signal for transmission data mapped to information of at least one of a virtual unit resource allocated to the transmission data and a virtual unit resource allocated to control information of the transmission data, and receives the ACK/NACK signal for the transmission data through the information of resources for receiving the ACK/NACK signal. | 04-05-2012 |
20120082117 | METHOD FOR TRANSMITTING UPLINK SIGNALS - A method for transmitting uplink signals, which include ACK/NACK signals, control signals other than the ACK/NACK signals, and data signals, is disclosed. The method comprises serially multiplexing the control signals and the data signals; sequentially mapping the multiplexed signals within a specific resource region in accordance with a time-first mapping method, the specific resource region including a plurality of symbols and a plurality of virtual subcarriers; and arranging the ACK/NACK signals at both symbols near symbols to which a reference signal of the plurality of symbols is transmitted. Thus, the uplink signals can be transmitted to improve receiving reliability of signals having high priority. | 04-05-2012 |
20120127940 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL INFORMATION IN WLAN SYSTEM - There is provided a method of transmitting control information in a Wireless Local Area Network (WLAN) system, comprising transmitting first control information by means of cyclic shift delay diversity beam-forming and transmitting second control information. The first control information comprises information necessary for each of a plurality of target stations of the second control information to receive the second control information. The second control information beamformed and transmitted to the plurality of target stations. | 05-24-2012 |
20120155414 | METHOD AND APPARATUS FOR TRANSMITTING A DOWNLINK REFERENCE SIGNAL IN A WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS - The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting a downlink reference signal in a wireless communication system that supports multiple antennas. A method for transmitting channel state information-reference signals (CSI-RS) for two or more antenna ports according to one embodiment of the present invention comprises the steps of: mapping the CSI-RSs for the two or more antenna ports in predetermined patterns on a data region of a downlink subframe: an transmitting the downlink subframe mapped with the CSI-RSs for the two or more antenna ports, wherein the predetermined patterns are defined as patterns differing by a cell, and the different patterns may be defined as the predetermined patterns being shifted in a temporal range, frequency range, or a temporal range and a frequency range. | 06-21-2012 |
20120163350 | METHOD FOR SCHEDULING DISTRIBUTED VIRTUAL RESOURCE BLOCKS - A method for transmitting downlink data using resource blocks at a base station in a wireless mobile communication system includes transmitting downlink data mapped to physical resource blocks (PRBs) to a user equipment, wherein indexes of virtual resource blocks (VRBs) are mapped to indexes of the PRBs for a first slot and a second slot of a subframe, and the indexes of the PRBs for the second slot are shifted with respect to the indexes of the PRBs for the first slot based on a predetermined gap, and wherein a predetermined offset is applied to an index of a PRB when the index of the PRB is equal to or greater than a predetermined threshold. | 06-28-2012 |
20120170516 | UPLINK SIGNAL TRANSMISSION AND RECEPTION USING OPTIMIZED RANK 3 CODEBOOK - A method for transmitting and receiving uplink signals using an optimized rank 3 codebook is disclosed. The optimized rank 3 codebook includes 6 precoding matrix groups, each of which has 1 variable having an amplitude of 1. Preferably, the optimized 4Tx rank 3 codebook has 12 precoding matrix, two precoding matrixes are selected from each the above 6 precoding matrix groups considering chordal distance and the number of precoding matrix. | 07-05-2012 |
20120170533 | METHOD AND APPARATUS FOR CONTROLLING TRANSMIT POWER IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus of controlling transmit power in a wireless communication system is provided. A wireless apparatus selects one transmit mode among a plurality of transmit modes, and determines the transmit power on the basis of the selected transmit mode. The wireless apparatus transmits an uplink channel by using the transmit power. | 07-05-2012 |
20120213204 | METHOD AND APPARATUS FOR COMMUNICATION IN A WIRELESS LAN SYSTEM - A communication method in a wireless local area network (WLAN) system is provided. The communication method includes: configuring, by a first access point (AP), a first basic service set (BSS) which uses a first primary channel (P-CH) and a first secondary channel (S-CH); and configuring, by a second AP, a second BSS which uses a second P-CH, a second S-CH, a second tertiary channel (T-CH), and a second quaternary channel (Q-CH), wherein a band of the first P-CH overlaps with a band of the second P-CH, and the second P-CH is a common channel which is used in an operation of a member station of the second BSS. | 08-23-2012 |
20120224570 | METHOD AND APPARATUS FOR TRANSMITTING DATA IN WLAN SYSTEM - A method of transmitting data in a WLAN system using a transmission frequency band including a plurality of frequency blocks includes generating a transmission information field, including at least one of information for timing acquisition of a frame, channel estimation information, and information for demodulation and decoding of the data, generating a plurality of transformed transmission information fields by multiplying the transmission information field by a transform sequence, and transmitting the plurality of transformed transmission information fields through the plurality of respective frequency blocks. The transform sequence comprises a plurality of transform values, and the plurality of transformed transmission information fields is generated by multiplying transmission information field by each of a plurality of transform values. | 09-06-2012 |
20120230443 | MU-MIMO TRANSMISSION METHOD IN WIRELESS LAN SYSTEM - A Multi-User-Multiple Input Multiple Output (MU-MIMO) transmission method performed by an AP in a Wireless Local Area Network (WLAN) system is provided. The method includes transmitting an MU-MIMO initiation message to a destination STA which is a target of a MU-MIMO transmission, the MU-MIMO initiation message informing that MU-MIMO transmission will be initiated, receiving a sounding frame transmitted by the destination STA as a response to the MU-MIMO initiation message and performing MU-MIMO transmission on data by beamforming based on channel information obtained from the sounding frame. The sounding frame includes precoded and virtualized channel information H | 09-13-2012 |
20120257574 | METHOD OF REDUCING INTERFERENCE BETWEEN STATIONS IN WIRELESS LAN SYSTEM, AND APPARATUS SUPPORTING THE SAME - An interference avoidance method performed by an Access Point (AP) in a WLAN system in an Overlapping Basic Service Set (OBSS) environment is provided. The interference avoidance method includes receiving an interference avoidance request message from the first STA, the interference avoidance request message informing that frame transmission of the AP acts as interference with a first STA; transmitting an interference avoidance response message in response to the interference avoidance request message; obtaining first channel information about a first channel between the first STA and the AP from the first STA which has received the interference avoidance response message; determining a transmitting steering matrix based on the first channel information; and transmitting data to a second STA by performing beamforming according to the transmitting steering matrix. | 10-11-2012 |
20120269137 | METHOD FOR PERFORMING RETRANSMISSION IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - A method for performing retransmission at a user equipment of a MIMO wireless communication system is disclosed. The method comprises transmitting multiple transport blocks to a base station for a transmission unit time in accordance with uplink grant information, which includes a first new data indicator; receiving ACK/NACK (Acknowledgement/Negative-ACK) responses corresponding to the respective transport blocks and uplink grant information, which includes a second new data indicator, from the base station; and performing new transmission or retransmission for the multiple transport blocks in one transport block unit for a transmission unit time in accordance with the ACK/NACK responses and the second new data indicator, if transport rank is reduced to 1. | 10-25-2012 |
20120275332 | INTERFERENCE AVOIDANCE METHOD AND APPARATUS FOR SUPPORTING SAME IN A WIRELESS LAN SYSTEM - An interference avoidance method performed by an access point (AP) in a wireless local area network (WLAN) system is provided. The method includes: transmitting a training request (TRQ) message for requesting transmission of a sounding frame to a first station which is a target of multi-user multiple input multiple output (MU-MIMO) transmission and a second station which receives data through a direct link during the MU-MIMO transmission; receiving first and second sounding frames respectively transmitted by the first and second stations in response to the TRQ message; estimating a channel by using the first sound frame to determine a beam-forming vector to be used for the MU-MIMO transmission; and performing the MU-MIMO transmission for MU-MIMO transmission target stations including the first station, wherein the beam-forming vector is determined such that the MU-MIMO transmission has a minimum effect on the second station by considering channel information between the AP and the second station and acquired on the basis of the second sounding frame received from the second station. | 11-01-2012 |
20120294255 | LINK ADAPTATION METHOD AND APPARATUS IN WIRELESS LAN SYSTEM - A link adaptation method performed by a station (STA) in a wireless local area network (LAN) system supporting multi-user multiple-input multiple-output (MU-MIMO) is provided. The method includes: receiving a modulation and coding scheme (MCS) request, a steered sounding physical layer convergence procedure (PLOP) protocol data unit (PPDU) which is beam-formed to the STA, and a MIMO indicator including MU-MIMO-related information from an access point (AP); and transmitting feedback information including an MCS acquired from the steered sounding PPDU and the MU-MIMO-related information to the AP in response to the MCS request. | 11-22-2012 |
20120309426 | METHOD FOR TRANSMITTING LOCATION BASED SERVICE-REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - A method for allowing a mobile station to detect a Location Based Service-Reference Signal (LBS-RS) in a wireless communication system is disclosed. The method includes receiving LBS-RS setup information of at least one target cell participating in location measurement from a serving cell, acquiring a frequency offset value of the target cell using the LBS-RS setup information, and detecting the LBS-RS transmitted from the target cell using the LBS-RS setup information and the frequency offset value. In addition, the method further includes measuring a reception delay time of the detected LBS-RS, and transmitting a reception delay time to the serving cell. | 12-06-2012 |
20120311397 | METHOD FOR DETERMINING TRANSPORT BLOCK SIZE AND SIGNAL TRANSMISSION METHOD USING THE SAME - A method and device for determining a size of a transport block based on modulation and coding related information, and resource information. | 12-06-2012 |
20120311414 | METHOD FOR DETERMINING TRANSPORT BLOCK SIZE AND SIGNAL TRANSMISSION METHOD USING THE SAME - A device and method for attaching a CRC code to a transport block and turbo encoding the CRC attached transport block, where the transport block has a predetermined size. | 12-06-2012 |
20120314673 | METHOD AND APPARATUS FOR ALLOCATING TRANSMISSION CHANNEL IN WIRELESS LOCAL AREA NETWORK SYSTEM - A method of allocating a channel in a wireless local area network (WLAN) system is provided. The method includes generating a MAC protocol data unit (MPDU) to be transmitted to a target station (STA), generating a PLCP protocol data unit (PPDU) by attaching a physical layer convergence procedure (PLCP) header to the MPDU, and transmitting the PPDU to the STA, wherein the PLCP header includes channel allocation information for transmission of the PPDU. | 12-13-2012 |
20120327862 | METHOD AND APPARATUS FOR TRANSMITTING A FRAME IN A WIRELESS RAN SYSTEM - There is provided a method and apparatus for transmitting a frame which is performed by a transmission STA in a WLAN system. The method of transmitting a frame includes generating an MAC Protocol Data Unit (MPDU) to be transmitted to a target station, generating a PLCP Protocol Data Unit (PPDU) by attaching a Physical Layer Convergence Procedure (PLCP) header to the MPDU, and transmitting the PPDU to the target station. The PLCP header comprises a partial Association ID (AID) of the target station. | 12-27-2012 |
20120327914 | METHOD FOR TRANSMITTING SOUNDING SIGNAL IN WIRELESS COMMUNICATION SYSTEM - Disclosed is a method for allowing a station to transmit a sounding signal in a multiple-antenna wireless communication system, the method including receiving a group defining information about a group to which the station belongs from an access point (AP); determining a transmission time taken in transmitting a sounding signal by the respective stations, which belong to the group, on the basis of the group defining information; and transmitting a sounding signal to the AP in accordance with the transmission time and preset transmission order when receiving a sounding request signal from the AP. | 12-27-2012 |
20130019145 | METHOD FOR DETERMINING TRANSPORT BLOCK SIZE AND SIGNAL TRANSMISSION METHOD USING THE SAME - A method and device for segmenting, CRC encoding and turbo encoding a CRC attached transport block. | 01-17-2013 |
20130021898 | METHOD AND APPARATUS FOR UPLINK MULTIPLE INPUT MULTIPLE OUTPUT (MIMO) TRANSMISSION - The present description relates to a wireless communication system, and more particularly, to a method and apparatus for uplink multiple input multiple output (MIMO) transmission. A method for performing an uplink MIMO transmission according to one embodiment of the present invention comprises the following steps: transmitting, from a first subframe, a first data block and a second data block through a first HARQ process and a second HARQ process, respectively; receiving, at a second subframe, uplink scheduling control information on the first data block and control information which indicates inactivation of the second data block; setting HARQ feedback information on the second data block to an ACK state; and performing retransmission of the first data block from a third subframe on the basis of the uplink scheduling control information on the first data block. Retransmission of the second data block may not be performed until uplink scheduling control information on the second data block is received. | 01-24-2013 |
20130114757 | METHOD AND APPARATUS OF TRANSMITTING PLCP HEADER FOR SUB 1 GHZ COMMUNICATION - Method and apparatus of transmitting PLCP header for sub 1 GHz communication is disclosed. A method of transmitting a physical layer convergence protocol(PLCP) header may comprise generating a short training field (STF) sequence over 1 orthogonal frequency division multiplexing (OFDM) symbol, transforming the STF sequence to repeated waveform patterns in time domain and transmitting the PLCP header comprising the STF sequence, wherein the STF sequence may be a sequence transformed to repeated waveform patterns in time domain by inverse discrete Fourier transform (IDFT). | 05-09-2013 |
20130121247 | METHOD FOR TRANSMITTING CHANNEL QUALITY INFORMATION IN A MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM - A method is provided for transmitting channel quality information (CQI) in a MIMO system. A method for allowing a receiver to feed back a CQI value to a transmitter in a Multiple Input Multiple Output (MIMO) system includes receiving a transmission (Tx) pilot signal for each Tx antenna from a base station (BS), measuring a first CQI value of a first codeword and a second CQI value of a second codeword on the basis of the pilot signal, and transmitting the first CQI value of the first codeword and the second CQI value of the second codeword to the base station (BS), wherein at least one of the first and second CQI values includes specific information capable of indicating a transmission restriction status of a corresponding codeword. | 05-16-2013 |
20130223380 | METHOD AND APPARATUS OF TRANSMITTING REFERENCE SIGNAL FOR UPLINK TRANSMISSION - A method and apparatus of transmitting a reference signal in a wireless communication system is provided. The method includes generating a precoded reference signal or a non-precoded reference signal in accordance with a rank, and transmitting the generated reference signal. Uplink transmission using multiple transmit antennas is supported through reference signal design and related control signaling. | 08-29-2013 |
20130230123 | METHOD OF TRANSMITTING REFERENCE SIGNALS IN A WIRELESS COMMUNICATION HAVING MULTIPLE ANTENNAS - A method of transmitting signals by a transmitting end in a wireless communication system comprises sharing control information related to reference signal with a receiving end; generating one or more precoded reference signals considering a given rank; allocating the one or more precoded reference signals to have a specific pattern within a subframe, wherein the specific pattern is varied depending on the control information; and transmitting the subframe through multiple antennas to the receiving end. | 09-05-2013 |
20130250832 | METHOD FOR MANAGING POWER SAVE MODE IN WIRELESS LAN SYSTEM, AND DEVICE FOR SUPPORTING SAME - Provided is a method for operating a power save mode performed by an access point in a WLAN system. The method includes: transmitting, by an access point (AP), a first traffic indication map (TIM) broadcast indication frame to a first station (STA); transmitting, by the AP, a second TIM broadcast indication frame to a second STA; transmitting, by the AP, a first TIM frame indicating that buffered traffic to the first STA is present; and transmitting, by the AP, a second TIM frame indicating that buffered traffic to the second STA is present. The first TIM broadcast indication frame includes a first TIM offset field indicating a transmission time of the first TIM frame, and the second TIM broadcast indication frame includes a second TIM offset field indicating a transmission time of the second TIM frame. | 09-26-2013 |
20130258932 | METHOD FOR POWER SAVE MODE OPERATION IN WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR THE SAME - A method for a power save mode operation in a wireless local area network (WLAN) system is provided. The method includes transmitting, by an access point (AP), a traffic indication map (TIM) element that announces existence of buffered traffic, wherein the TIM element includes an association ID (AID) assigned to a buffered STA having the buffered traffic when the buffered station (STA) is associated with the AP; receiving, by the AP, a poll frame for requesting data frame transmission from a candidate STA, wherein the poll frame contains an AID of the candidate STA and a medium access control (MAC) address which is a unique identifying information of the candidate STA; and determining, by the AP, whether the candidate STA is the buffered STA on the basis of the AID and the MAC address of the candidate STA. | 10-03-2013 |
20130286981 | METHOD FOR TRANSMITTING CONTROL INFORMATION, AND METHOD FOR GENERATING CODEWORD FOR THE SAME - A method for transmitting downlink control information and a method for generating a codeword for the same are disclosed. In generating a long code having a low code rate, a basic code of which minimum distance between codes is maximized is repeated by a prescribed number of times and bits of the repeated code are adjusted. Therefore, a minimum distance condition between codes of a long code is satisfied and simultaneously the code be simply generated. | 10-31-2013 |
20130315114 | METHOD AND DEVICE FOR SCHEDULING IN CARRIER AGGREGATE SYSTEM - According to one embodiment, a scheduling method of a base station (BS) in a carrier aggregation system includes: transmitting uplink-downlink (UL-DL) configuration information on a time division duplex (TDD) frame used in a second serving cell through a first serving cell; and communicating with a user equipment (UE) through a subframe of the second serving cell configured by the UL-DL configuration information, wherein the first serving cell and the second serving cell are serving cells allocated to the UE. | 11-28-2013 |
20130329824 | METHOD AND APPARATUS FOR ALLOCATING A PLURALITY OF DATA SYMBOLS IN A WIRELESS COMMUNICATION SYSTEM - According to one embodiment, a method for transmitting an uplink signal includes transmitting the uplink signal including a block of data symbols. The block of data symbols are mapped to at least two sets of subcarrier blocks. Each data symbol of the block of data symbols is mapped to one of subcarriers of the at least two sets of subcarrier blocks. The at least two sets of subcarrier blocks are not contiguous in frequency. The block of data symbols are mapped in sequence starting with a first data symbol to the at least two sets of subcarrier blocks and in increasing order of subcarrier index. | 12-12-2013 |
20130336257 | METHOD AND APPARATUS FOR TRANSMITTING PLCP FRAME IN WIRELESS LOCAL AREA NETWORK SYSTEM - A method of transmitting a Physical Layer Convergence Procedure (PLCP) frame in a Very High Throughput (VHT) Wireless Local Area Network (WLAN) system includes generating a MAC Protocol Data Unit (MPDU) to be transmitted to a destination station (STA), generating a PLCP Protocol Data Unit (PPDU) by adding a PLCP header, including an L-SIG field containing control information for a legacy STA and a VHT-SIG field containing control information for a VHT STA, to the MPDU, and transmitting the PPDU to the destination STA. A constellation applied to some of Orthogonal Frequency Division Multiplex (OFDM) symbols of the VHT-SIG field is obtained by rotating a constellation applied to an OFDM symbol of the L-SIG field. | 12-19-2013 |
20130343300 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA - A method and apparatus of transmitting and receiving data is provided. A method of a channel state information (CSI) feedback of a mobile terminal comprises receiving, by the mobile terminal, a CSI feedback configuration configuring a CSI feedback reporting to a base station without precoding matrix index (PMI) and rank index (RI), receiving, by the mobile terminal, a CSI configuration for a channel state information reference signal (CSI-RS), determining, by the mobile terminal, a physical downlink share channel (PDSCH) transmission scheme based on an antenna port of the CSI-RS, determining, by the mobile terminal, a CSI based on the PDSCH transmission scheme and transmitting, by the mobile terminal, the CSI to the base station. | 12-26-2013 |
20130343363 | METHOD FOR SCHEDULING DISTRIBUTED VIRTUAL RESOURCE BLOCKS - A method for efficiently scheduling virtual resource blocks to physical resource blocks is disclosed. In a wireless mobile communication system, for distributed mapping of consecutively allocated virtual resource blocks to physical resource blocks, when nulls are inserted into a block interleaver used for the mapping, they are uniformly distributed to N | 12-26-2013 |
20140016717 | METHOD FOR GENERATING REFERENCE SIGNAL SEQUENCE IN MULTI-ANTENNA WIRELESS COMMUNICATION SYSTEM AND APPARATUS FOR SAME - The present application discloses a method in which a base station transmits a reference signal sequence in a wireless communication system. In detail, the method comprises the steps of: generating a pseudo-random sequence using a first m-sequence and a second m-sequence; generating the reference signal sequence using the pseudo-random sequence; and transmitting the reference signal to a mobile station via antenna ports different from one another. The second m-sequence has an initial value containing parameters for discriminating reference signal sequences among users. | 01-16-2014 |
20140029554 | METHOD AND APPARATUS FOR CONTROLLING TRANSMIT POWER IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus of controlling transmit power in a wireless communication system is provided. A wireless apparatus selects one transmit mode among a plurality of transmit modes, and determines the transmit power on the basis of the selected transmit mode. The wireless apparatus transmits an uplink channel by using the transmit power. | 01-30-2014 |
20140036834 | METHOD FOR SCHEDULING DISTRIBUTED VIRTUAL RESOURCE BLOCKS - A method for transmitting downlink data using resource blocks at a base station in a wireless mobile communication system includes transmitting downlink data mapped to physical resource blocks (PRBs) to a user equipment, wherein indexes of virtual resource blocks (VRBs) are mapped to indexes of the PRBs for a first slot and a second slot of a subframe, and the indexes of the PRBs for the second slot are shifted with respect to the indexes of the PRBs for the first slot based on a predetermined gap, and wherein a predetermined offset is applied to an index of a PRB when the index of the PRB is equal to or greater than a predetermined threshold. | 02-06-2014 |
20140050206 | METHOD AND APPARATUS FOR TRANSMITTING SYNCHRONIZATION SIGNAL IN CARRIER AGGREGATION SYSTEM - Provided is a method and an apparatus for transmitting a synchronization signal in a carrier aggregation system. The method comprises: transmitting via a first serving cell a synchronization signal setting information with regard to a second serving cell; and transmitting the synchronization signal via the second serving cell, wherein the synchronization signal is variably set by means of the synchronization signal setting information. | 02-20-2014 |
20140064218 | METHOD OF TRANSMITTING SOUNDING REFERENCE SIGNAL - A method of transmitting a sounding reference signal (SRS) includes receiving SRS operation information including a sounding indicator, the sounding indicator indicating whether SRS transmission takes place at a subframe; generating the SRS according to the SRS operation information, and if the sounding indicator indicates occurrence of SRS transmission, transmitting the SRS at the subframe. Multiplexing can be achieved without collision between data and a sounding reference signal and single carrier characteristics required in uplink transmission can be preserved. | 03-06-2014 |
20140079003 | METHOD AND APPARATUS FOR ALLOCATING TRANSMISSION CHANNEL IN WIRELESS LOCAL AREA NETWORK SYSTEM - According to one embodiment, a method for a wireless local area includes: generating a medium access control (MAC) protocol data unit (MPDU) to be transmitted to a target station; generating a physical layer convergence procedure (PLCP) protocol data unit (PPDU) by attaching a PLCP preamble to the MPDU; selecting a transmission channel; and transmitting the PPDU to the target station over the transmission channel. Selecting the transmission channel includes: performing clear channel assessment (CCA) on a first channel to determine whether the first channel is idle; and only after it is determined that the first channel is idle, selecting the first channel and at least one idle second channel as the transmission channel. The PLCP preamble includes channel allocation information indicating a bandwidth of the transmission channel. | 03-20-2014 |
20140092862 | METHOD FOR TRANSMITTING REFERENCE SIGNALS IN A DOWNLINK MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM - In a system having a plurality of cells participating in a Coordinated Multi-Point (CoMP) operation, a method for transmitting Reference Signals (RSs) to User Equipment (UE) includes generating, by Base Station (BS) included in each of the plurality of cells, a subframe including RSs for a UE located in the each of the plurality of cells, and transmitting the generated subframe to the UE by the BS. The RSs include RSs for channel measurement, and RSs for data demodulation, the plurality of cells are grouped according to frequency shift values applied to the RSs for channel measurement and RS allocation patterns are determined for two cells among the plurality of cells according to a predetermined rule. | 04-03-2014 |
20140140311 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL INFORMATION IN WLAN SYSTEM - There is provided a method of transmitting control information in a Wireless Local Area Network (WLAN) system, comprising transmitting first control information by means of cyclic shift delay diversity beam-forming and transmitting second control information. The first control information comprises information necessary for each of a plurality of target stations of the second control information to receive the second control information. The second control information beamformed and transmitted to the plurality of target stations. | 05-22-2014 |
20140140312 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL INFORMATION IN WLAN SYSTEM - There is provided a method of transmitting control information in a Wireless Local Area Network (WLAN) system, comprising transmitting first control information by means of cyclic shift delay diversity beam-forming and transmitting second control information. The first control information comprises information necessary for each of a plurality of target stations of the second control information to receive the second control information. The second control information beamformed and transmitted to the plurality of target stations. | 05-22-2014 |
20140161079 | METHOD AND APPARATUS FOR COMMUNICATION IN A WIRELESS LAN SYSTEM - A communication method in a wireless local area network (WLAN) system is provided. The communication method includes: communicating, by a first station, with a second station, via an operating channel of the new BSS, a width of the operating channel being equal to one among 40 MHz, 80 MHz, 80+80 MHz and 160 MHz. The operating channel includes a primary channel selected among a set of channels by the second station, the selected primary channel is not identical to a secondary 20 MHz channel of one or more existing BSSs scanned by the second station, and the secondary 20 MHz of the one or more existing BSSs is contiguous with a primary 20 MHz channel of the one or more existing BSSs. | 06-12-2014 |
20140185425 | METHOD OF ALLOCATING RESOURCES FOR TRANSMITTING UPLINK SIGNAL IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF - A method of allocating resources for transmitting a signal in a Multiple-Input Multiple-Output (MIMO) wireless communication system is disclosed. The method includes allocating one or more spatial resources of a plurality of spatial resources corresponding to first Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbols to a first transport block, allocating one or more other spatial resources of the plurality of spatial resources corresponding to the first SC-FDMA symbols to a second transport block, and allocating spatial resources corresponding to second SC-FDMA symbols to the first transport block and the second transport block. | 07-03-2014 |
20140219386 | METHOD FOR DETERMINING TRANSPORT BLOCK SIZE AND SIGNAL TRANSMISSION METHOD USING THE SAME - A method for performing, by a first device, channel coding of data to be transmitted to a second device, the method includes: determining a size of a transport block for the data; attaching a first cyclic redundancy check (CRC) code to the transport block having the determined size to produce a first CRC-attached transport block; and segmenting the first CRC-attached transport block into multiple code blocks, wherein the size of the transport block is determined from among a plurality of predetermined transport block sizes such that the multiple code blocks have a same size as each other. | 08-07-2014 |
20140254526 | METHOD FOR RECEIVING ACK/NACK SIGNAL IN MOBILE COMMUNICATION SYSTEM - A method for transmitting information of resources for use in transmission of ACK/NACK signals in a mobile communication system is disclosed. An example method for receiving ACK/NACK signals in a mobile communication system is also disclosed. When resources for transmission of data and resources for transmission of control information of the data are scheduled through virtual unit resources, the method identifies information of resources for receiving an ACK/NACK signal for transmission data mapped to information of at least one of a virtual unit resource allocated to the transmission data and a virtual unit resource allocated to control information of the transmission data, and receives the ACK/NACK signal for the transmission data through the information of resources for receiving the ACK/NACK signal. | 09-11-2014 |
20140301357 | METHOD AND APPARATUS FOR ALLOCATING A PLURALITY OF DATA SYMBOLS IN A WIRELESS COMMUNICATION SYSTEM - According to one embodiment, a method for transmitting an uplink signal includes transmitting the uplink signal including a block of data symbols. The block of data symbols are mapped to at least two sets of subcarrier blocks. Each data symbol of the block of data symbols is mapped to one of subcarriers of the at least two sets of subcarrier blocks. The at least two sets of subcarrier blocks are not contiguous in frequency. The block of data symbols are mapped in sequence starting with a first data symbol to the at least two sets of subcarrier blocks and in increasing order of subcarrier index. | 10-09-2014 |
20140314056 | METHOD FOR TRANSMITTING AND RECEIVING A FRAME IN A WIRELESS LAN SYSTEM AND APPARATUS FOR SUPPORTING SAME - The present invention relates to a method for transmitting and receiving a frame performed by an AP in a wireless communication system. The method includes the steps of: transmitting a PST message providing instructions to transmit a frame to at least one STA; and receiving frames from a first STA and a second STA. The PST message includes first subband information indicating a first subband in which a first frame is transmitted from the first STA and second subband information indicating a second subband in which a second frame is transmitted from the second STA. | 10-23-2014 |
20140314064 | METHOD FOR TRANSMITTING DATA UNIT IN WIRELESS LOCAL AREA NETWORK SYSTEM AND APPARATUS FOR SUPPORTING SAME - Provided is a method for transmitting a data unit in a wireless local area network system, according to one embodiment. The method comprises transmitting a signal field, transmitting a first data symbol for a first data field, and transmitting a second data symbol for a second data field. The signal field, the first data symbol, and the second data symbol are transmitted through a 1 MHz channel bandwidth having a band of 1 GHz or less. Two pilot tones are inserted to each of the first data symbol and the second data symbol. | 10-23-2014 |
20140341313 | METHOD FOR TRANSMITTING SOUNDING REFERENCE SIGNAL IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - A method for transmitting a sounding reference signal in a MIMO wireless communication system and an apparatus therefor are disclosed. The method for transmitting sounding reference signals (SRSs) in a MIMO wireless communication system comprises receiving sounding reference signal parameters from a base station; receiving information of the number of sounding reference signals which will be transmitted at a transmission time instant from the base station; if a plurality of sounding reference signals are provided, generating the sounding reference signals corresponding to each of the plurality of antennas by using the sounding reference signal parameters; and transmitting the generated sounding reference signals to the base station through their corresponding antennas at a specific transmission instant. | 11-20-2014 |
20140362845 | METHOD AND APPARATUS FOR TRANSMITTING A FRAME IN A WIRELESS RAN SYSTEM - A method and apparatus are described for transmitting data. The method includes generating, by an access point (AP), a Physical Layer Protocol Data Unit (PPDU) including a signal field and a data field, and transmitting, by the AP, the PPDU to a station. The signal field includes a reception target indicator and an identifier field. The reception target indicator indicates whether a target of the PPDU is the AP or the station. The identifier field includes a local AP identifier identifying the AP when the reception target indicator indicates that the target of the PPDU is the station. | 12-11-2014 |
20140369262 | METHOD FOR TRANSMITTING CHANNEL QUALITY INFORMATION BASED ON DIFFERENTIAL SCHEME - A method for transmitting channel quality information based on a differential scheme is disclosed. When channel quality information of a predetermined number of sub-bands selected by a receiver in a frequency selective channel is transmitted, total average channel information is transmitted. Channel information of the selected sub-bands is transmitted as sub-band differential information associated with average channel information. In this case, the sub-band differential information may be denoted by a specific value contained in a differential-value range including only positive (+) values. If at least two channel quality information is transmitted by a MIMO system, channel quality information of one channel is transmitted, then channel quality information of the other channel is transmitted as spatial differential information. In this case, the spatial differential information is denoted by a specific value contained in a differential-value range asymmetrical on the basis of “0”. | 12-18-2014 |
20140369294 | METHOD AND APPARATUS FOR TRANSMITTING UPLINK CONTROL INFORMATION IN WIRELESS COMMUNICATION SYSTEM - Provided are a method for a terminal transmitting uplink control information (UCI) through a physical uplink control channel (PUCCH) in a wireless communication system, and a terminal using the method. A transmission power to be applied to the uplink control channel is determined on the basis of a value subordinate to a PUCCH format, and at least one type of UCI is transmitted from the physical uplink control channel by using the transmission power that is determined, wherein when the PUCCH format is PUCCH format 3, and the at least one type of UCI includes acknowledgement/negative-acknowledgement (ACK/NACK) and periodic channel state information (CSI), the value subordinate to the PUCCH format is determined on the basis of the number of bits of the ACK/NACK and the number of bits of the periodic CSI. | 12-18-2014 |
20150016388 | METHOD OF TRANSMITTING SOUNDING REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting a sounding reference signal includes generating a physical uplink control channel (PUCCH) carrying uplink control information on a subframe, the subframe comprising a plurality of SC-FDMA (single carrier-frequency division multiple access) symbols, wherein the uplink control information is punctured on one SC-FDMA symbol in the subframe, and transmitting simultaneously the uplink control information on the PUCCH and a sounding reference signal on the punctured SC-FDMA symbol. The uplink control information and the sounding reference signal can be simultaneously transmitted without affecting a single carrier characteristic. | 01-15-2015 |
20150023308 | LINK ADAPTATION METHOD AND APPARATUS IN WIRELESS LAN SYSTEM - A link adaptation method performed by a station (STA) in a wireless local area network (LAN) system supporting multi-user multiple-input multiple-output (MU-MIMO) is provided. The method includes: receiving a modulation and coding scheme (MCS) request, a steered sounding physical layer convergence procedure (PLOP) protocol data unit (PPDU) which is beam-formed to the STA, and a MIMO indicator including MU-MIMO-related information from an access point (AP); and transmitting feedback information including an MCS acquired from the steered sounding PPDU and the MU-MIMO-related information to the AP in response to the MCS request. | 01-22-2015 |
20150029986 | MU-MIMO TRANSMISSION METHOD IN WIRELESS LAN SYSTEM - A Multi-User-Multiple Input Multiple Output (MU-MIMO) transmission method performed by an Access Point (AP) in a Wireless Local Area Network (WLAN) system is provided. The method includes transmitting an MU-MIMO initiation message to a destination Station (STA) which is a target of a MU-MIMO transmission, the MU-MIMO initiation message informing that MU-MIMO transmission will be initiated, receiving a sounding frame transmitted by the destination STA as a response to the MU-MIMO initiation message and performing MU-MIMO transmission on data by beamforming based on channel information obtained from the sounding frame. The sounding frame includes precoded and virtualized channel information between the AP and the STA. A dimension of the virtualized channel information is lower than a dimension of channel information between the AP and the STA. | 01-29-2015 |
20150063289 | METHOD FOR TRANSMITTING SOUNDING REFERENCE SIGNAL IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - A method for transmitting a sounding reference signal in a MIMO wireless communication system and an apparatus therefor are disclosed. The method for transmitting sounding reference signals (SRSs) in a MIMO wireless communication system comprises receiving sounding reference signal parameters from a base station; receiving information of the number of sounding reference signals which will be transmitted at a transmission time instant from the base station; if a plurality of sounding reference signals are provided, generating the sounding reference signals corresponding to each of the plurality of antennas by using the sounding reference signal parameters; and transmitting the generated sounding reference signals to the base station through their corresponding antennas at a specific transmission instant. | 03-05-2015 |
20150063294 | METHOD FOR TRANSMITTING REFERENCE SIGNALS IN A DOWNLINK MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM - A method for transmitting, by a base station, configuration information for a reference signal for channel measurement. The method according to one embodiment includes transmitting, to a user equipment, first resource information for indicating a first pattern, first subframe information for indicating a first subframe, second resource information for indicating a second pattern, and second subframe information for indicating a second subframe. The first subframe information includes information indicating a first periodic interval, and the second subframe information indicates information indicating a second periodic interval. Each of the first and second subframes is comprised of two slots—slot 0 and slot 1, and each of the first and second reference signal time-frequency resources is within two OFDM symbols other than OFDM symbols 0, 1, 2, and 3 of the slot 0 and other than OFDM symbols 0, 1, and 3 of the slot 1. | 03-05-2015 |
20150071048 | METHOD OF ALLOCATING RESOURCES FOR TRANSMITTING UPLINK SIGNAL IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF - A method and terminal apparatus are described for performing channel interleaving at a terminal in a multiple-input multiple-output (MIMO) wireless communication system. A number of columns C of an interleaver matrix are assigned as a number of symbols for transmitting data per subframe (N | 03-12-2015 |
20150071049 | METHOD OF ALLOCATING RESOURCES FOR TRANSMITTING UPLINK SIGNAL IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF - A method and terminal apparatus are described for allocating resources for transmitting a signal in a multiple-input multiple-output (MIMO) wireless communication system. An uplink signal is transmitted using L layers at a terminal in a multiple-input multiple-output (MIMO) wireless communication system. Modulation symbols are generated by modulating output bit sequences of an interleaver matrix by a unit of log | 03-12-2015 |
20150078221 | METHOD AND APPARATUS FOR AGGREGATING CARRIERS IN WIRELESS COMMUNICATION SYSTEMS - The present invention relates to a method and apparatus for aggregating carriers in wireless communication systems. In the method, a first carrier is set up, and a second carrier is added in addition to the first carrier. In addition, the first carrier is a time division duplex (TDD) carrier for which an uplink subframe and a downlink subframe are positioned at different times in a frame, and the second carrier is a carrier only for a downlink that consists of downlink subframes. | 03-19-2015 |