| Patent application number | Description | Published |
|---|
| 20080198946 | DATA TRANSMITTING AND RECEIVING METHOD USING PHASE SHIFT BASED PRECODING AND TRANSCEIVER SUPPORTING THE SAME - A method for performing a precoding based on a generalized phase shift or a precoding based on an extended phase shift in a Multi-Input Multi-Output (MIMO) system employing several sub-carriers, and a transceiver for supporting the same are disclosed. A phase-shift-based precoding matrix is generalized by multiplying a diagonal matrix for a phase shift by a unitary matrix for maintaining orthogonality between sub-carriers. In this case, a diagonal matrix part may be extended by multiplying a precoding matrix for removing interference between sub-carriers by a diagonal matrix for a phase shift. By generalization and extension of the phase-shift-based precoding, a transceiver is more simplified, and communication efficiency increases. | 08-21-2008 |
| 20090059844 | METHOD OF TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM - A method of transmitting data in a wireless communication system comprises receiving feedback data on an uplink data channel, the feedback data comprising a precoding matrix indicator (PMI), wherein the value of the PMI corresponds to an index in a codebook, transmitting a precoding scheme for downlink data on a downlink control channel, wherein the preceding scheme is determined as one of at least two of a transmit diversity irrespective of the received PMI, an acknowledgement indicating preceding according to the received PMI and a new PMI indicating that it is used in precoding downlink data to be transmitted, and transmitting the downlink data on a downlink data channel after applying precoding according to the determined preceding scheme. | 03-05-2009 |
| 20090067531 | METHOD FOR REPORTING CHANNEL INFORMATION IN MULTIPLE ANTENNA SYSTEM - There is provided a method of reporting downlink channel information to a base station in a multiple antenna system. The method includes reporting a single rank for overall subband, the overall subband comprising a plurality of subbands and reporting a CQI for the single rank for at least one subband. Radio resources required for reporting channel information can be reduced and signaling overheads can be minimized. | 03-12-2009 |
| 20090129495 | ALLOCATION OF RADIO RESOURCE IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM - An uplink capacity is increased by a method in which more than two mobile stations simultaneously use a radio resource allocated to one mobile station. A method of allocating a radio resource in an orthogonal frequency division multiplexing system comprises receiving data associated with a radio resource allocation map from a base station, wherein the radio allocation map comprises control parameters for transmitting uplink data to the base station. The control parameters comprises orthogonal pilot pattern indicator for using orthogonal pilot patterns associated with supporting at least concurrent dual transmission by at least one mobile station, and for use in the same frequency band and same time duration. The orthogonal pilot patterns comprises at least a minus pilot being used for an uplink basic allocation unit. The mobile station then transmits uplink data to the base station by using the orthogonal pilot patterns. | 05-21-2009 |
| 20090168716 | METHOD FOR RESOURCE PARTITIONING WITH PREDEFINED PATTERN AND ADAPTIVE RESOURCE PARTITIONING METHOD - An adaptive resource partitioning method includes: selecting a predefined pattern-based partitioning method or an informed map-based partitioning method according to the number of channels used for resource allocation, data characteristics, and a channel environment variation, if the predefined pattern scheme is selected, selecting any of predefined patterns, partitioning distributed and localized resource allocation areas according to the selected pattern, and transmitting a pattern index of the selected pattern to a terminal, and if the informed map scheme is selected, partitioning distributed and localized resource allocation areas according to an arbitrary pattern, and transmitting bitmap control information indicating information of the partitioned areas to the terminal. So, it effectively obtains a diversity and a scheduling gain when distributed and localized resource allocations are simultaneously used, such that it increases flexibility of resource allocation, increases an available data transfer rate, and reduces an amount of necessary control information. | 07-02-2009 |
| 20090190543 | PACKET TRANSMISSION IN A WIRELESS COMMUNICATION SYSTEM USING MULTIPLE ANTENNAS - A method of retransmitting packet data in a wireless communication system comprises receiving a link map information element from a transmitting station having three antennas to achieve space time transmit diversity, wherein first, second and third packet data are transmitted from first, second and third antenna of the transmitting station, respectively. The method also comprises transmitting a non-acknowledgement signal to the transmitting station if at least one packet data from the transmitting station is not properly decoded. The method also comprises receiving the packet data from the transmitting station, wherein at least two of retransmitted packet data are transmitted from different antennas of the transmitting station, and one of retransmitted packet data is transmitted from the same antenna of the transmitting station. The retransmitted packet data are received with an information element comprising a retransmission count associated with a number of retransmission made by the transmitting station. | 07-30-2009 |
| 20090199063 | METHOD OF TRANSMITTING ACK/NACK SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting an acknowledgment (ACK)/non-acknowledgement (NACK) signal in a wireless communication system includes assigning at least one ACK channel among a plurality of ACK channels which share an ACK channel region for transmitting the ACK/NACK signal, and transmitting the ACK/NACK signal through the at least one ACK channel, wherein the ACK channel region includes at least one tile including a plurality of data subcarriers, and the ACK/NACK signal of each ACK channel is indicated by mapping different orthogonal vectors respectively to the plurality of ACK channels in the tile. | 08-06-2009 |
| 20090201951 | METHOD AND ADJUSTING TRANSMISSION TIMING AND TRANSMITTING CONTINUOUS PACKETS AND MOBILE STATION THEREOF - A method of adjusting transmission timing, a method of continuously transmitting packets, and a mobile station are provided. The method of adjusting the transmission timing includes adjusting the transmission timing according to a transmission timing adjustment command when the transmission timing adjustment command is received from a receiving side; and creating a cyclic prefix (CP) in consideration of a part of a CP of a next symbol which overlaps with a previous symbol on a time axis on the basis of the adjusted transmission timing. Accordingly, it is possible to prevent deterioration in reception performance and minimize reception complexity even when packet transmission timing is adjusted at a transmitting side using an OFDMA or analogous radio access scheme. | 08-13-2009 |
| 20090207822 | Method for transmitting and receiving signals using collaborative MIMO scheme - A method for reducing inter-cell interference and a method for transmitting a signal by a collaborative MIMO scheme, in a communication system having a multi-cell environment are disclosed. An example of a method for transmitting, by a mobile station, precoding information in a collaborative MIMO communication system includes determining a precoding matrix set including precoding matrices of one more base stations including a serving base station, based on signal strength of the serving base station, and transmitting information about the precoding matrix set to the serving base station. A mobile station in an edge of a cell performs a collaborative MIMO mode or inter-cell interference mitigation mode using the information about the precoding matrix set collaboratively with neighboring base stations. | 08-20-2009 |
| 20090207831 | METHOD OF TRANSMITTING FEEDBACK INFORMATION USING AN EXTENDED SUBHEADER - A method of transmitting feedback information is disclosed. More specifically, a mobile station (MS) receives a Protocol Data Unit (PDU) which includes a Medium Access Channel (MAC) header from a base station (BS). Thereafter, the MS determines from the received MAC header whether an extended subheader group appears after the MAC header, and also identifies a feedback request extended subheader from the extended subheader group. Lastly, the MS transmits the feedback information according to the feedback request extended subheader. | 08-20-2009 |
| 20090219910 | METHOD FOR TRANSMITTING AND RECEIVING SIGNALS USING MULTI-BAND RADIO FREQUENCIES - A method for transmitting and receiving signals using multi-band Radio Frequencies (RFs) is provided. The method transmits an information unit of a specific layer above a physical layer through a plurality of frequency allocation bands managed by the specific layer and transmits control information identifying each of the plurality of frequency allocation bands. The control information identifying each of the plurality of frequency allocation bands includes a second ID into which a first ID has been converted, the first ID identifying each of the plurality of frequency allocation bands in the physical layer, the second ID identifying each of the plurality of frequency allocation bands managed by the specific layer in the specific layer. To accomplish this, a timing offset is applied to the entirety of a frame or to a preamble (synchronous channel) so that the timing offset is used as the ID. Applying a timing offset to the entirety of a frame or to a preamble (synchronous channel) can achieve an advantage of PAPR reduction. | 09-03-2009 |
| 20090232163 | METHOD FOR GENERATING SUBFRAME INCLUDING RESOURCE DISTRIBUTION INFORMATION - A method for generating a subframe including resource distribution information is disclosed. The method for generating a subframe includes arranging resource allocation information in a subframe by sequentially allocating a localized permutation and a distributed permutation, and arranging a subframe control header including a resource unit index in a predetermined location by a system parameter, wherein the resource unit index indicates a frequency resource location of the resource allocation information. When both the localized permutation and the distributed permutation are used, a resource distribution method is transmitted to a user equipment. Therefore, an effect of the distributed permutation can be maximized without a great influence on the performance of the localized permutation, and a problem of decoding failure or latency can be prevented. | 09-17-2009 |
| 20090232235 | User scheduling method in multiple antenna system - A user scheduling method includes: determining a maximum temporary user set of a maximum capacity among temporary user sets obtained from combinations of M number of active users; and transmitting data to users belonging to the maximum temporary user set via multiple antennas by using a preceding matrix and a weight matrix with respect to the maximum temporary user set. Users to actually receive data can be selected from among active users in a multi-antenna system, and a corresponding precoding matrix and a weighting matrix can be obtained. | 09-17-2009 |
| 20090232239 | METHOD AND APPARATUS FOR TRANSMITTING A PILOT IN MULTI-ANTENNA SYSTEM - A method of transmitting a pilot method in a multi-antenna system is provided. The method comprises generating a preceding matrix including a preceding vector, the preceding vector being applied to each of data streams to be transmitted, performing preceding procedure for a pilot by using the preceding matrix, and transmitting the precoded pilot, wherein transmission power of the precoded pilot is determined specifically to the each of the data streams. The transmission power of a precoded pilot can be controlled adaptively, individually and independently for each channel to improve channel estimation performance. | 09-17-2009 |
| 20090233560 | METHOD FOR TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM - A method for transmitting data in a multi-antenna system includes determining a candidate mode in which a maximum upperbound approximation of an average total data rate is maximized as a transmission mode, selecting a user equipment to receive data by using the transmission mode, and transmitting data to the selected user equipment. | 09-17-2009 |
| 20090239473 | Method for transmitting channel information in multiple antenna system - A method for transmitting channel information in a multi-antenna system, the method includes calculating channel quality information (CQI) with respect to each mode, comparing the CQI with respect to each mode to a threshold value with respect to each mode, and transmitting CQI with respect to a mode having higher CQI than the threshold value as channel information. Good performance can be achieved regardless of the number of users or an SNR of users. | 09-24-2009 |
| 20090245410 | Method for transmitting signals for reducing feedback overhead and method for transmitting feedback information for the same - A method for transmitting signals to reduce feedback overhead and a method for transmitting feedback information for the same are described. In transmitting signals through precoding, different codebook subsets are used in an open-loop transmission mode and a closed-loop transmission mode, thereby reducing feedback overhead. In this case, it is assumed that the codebook subsets for the respective transmission modes are optimized according to each transmission mode. | 10-01-2009 |
| 20090257383 | FEEDBACK METHOD FOR PERFORMING A FEEDBACK BY USING A CODEBOOK IN MIMO SYSTEM - A feedback method for performing a feedback by using a codebook in Multiple Input Multiple Output (MIMO) system includes receiving, by the mobile station, a MIMO mode type information, generating feedback information by using the codebook selected according to the MIMO mode type information, and transmitting the feedback information to the base station. The codebook includes a SU-MIMO codebook and a MU-MIMO codebook, and the MU-MIMO codebook is formed by extracting codebook elements from the SU-MIMO codebook. As a result, the method maximizes a system throughput simultaneously while effectively reducing an amount of feedback information. | 10-15-2009 |
| 20090257384 | METHOD FOR MODE ADAPTATION IN MIMO SYSTEM - A mode adaptation method for performing mode switching between a single-user MIMO (SU-MIMO) mode and a multi-user MIMO (MU-MIMO) mode includes reporting, by a base station, a MIMO feedback mode to a mobile station, receiving a feedback information determined on the basis of the MIMO feedback mode from the mobile station; and determining a MIMO feedback mode based on the feedback information. The MIMO feedback mode indicates whether it is single-user MIMO or multi-user MIMO and includes a number of mobile stations (MSs) transferred at one time. As a result, the method maximizes a system throughput simultaneously while effectively reducing an amount of feedback information. | 10-15-2009 |
| 20090262854 | Method for transmitting and receiving downlink control information - A method for efficiently transmitting and receiving downlink control information is disclosed. The method includes, at an base station, receiving feedback information including a preceding matrix index (PMI) from an user equipment (UE) and transmitting precoding information having a predetermined bit number according to the number of antenna ports and a transmission mode of the base station. The preceding information of a predetermined transmission mode in the preceding information includes confirmation information indicating that the base station uses a PMI which is recently received from the UE. At this time, if the confirmation information is transmitted via a specific resource block (RB) of an n | 10-22-2009 |
| 20090268698 | METHOD FOR MODE ADAPTATION IN MIMO SYSTEM - A mode adaptation method for performing mode switching between a single-user MIMO (SU-MIMO) mode and a multi-user MIMO (MU-MIMO) mode includes receiving, by the base station, a preferred MIMO mode related information from a mobile station; determining a MIMO mode based on the preferred MIMO mode related information; reporting the MIMO mode to the mobile station; and receiving a feedback information of the MIMO mode from the mobile station. | 10-29-2009 |
| 20090285168 | METHOD FOR DESIGNING MINI RESOURCE UNIT AND TRANSMISSION FOR A DISTRIBUTED RESOURCE UNIT IN CONSIDERATION OF SPACE FREQUENCY BLOCK CODE - A method and device for wirelessly communicating between a mobile communication terminal and a base station, including exchanging a physical resource unit (PRU) between the base station and the mobile communication terminal, the PRU having a plurality of OFDMA symbols. Each 1 | 11-19-2009 |
| 20090303928 | Method for transmitting channel information in wireless communication system - A method for transmitting uplink channel information in a wireless communication system is provided. The method comprises transmitting an adaptive modulation and coding (AMC) band bitmap indicating at least one AMC band selected from a plurality of AMC bands with a first transmission period through a plurality of uplink control channels and transmitting a channel quality indicator (CQI) based on transmission of the AMC band bitmap with a second transmission period through any one of the plurality of uplink control channels. | 12-10-2009 |
| 20090304098 | Method of transmitting control signals in wireless communication system - A method of transmitting control signals in a wireless communication system is provided. The method comprises allocating at least one control signal in a control channel region comprising a plurality of tiles, each tile consisting of a plurality of consecutive subcarriers in a frequency domain on a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain and transmitting the at least one control signal, wherein the number of the at least one control signal is determined based on the number of available sequences for the control channel region and the number of bit carried by each control signal. | 12-10-2009 |
| 20090323615 | COMMUNICATING NON-COHERENT DETECTABLE SIGNAL IN BROADBAND WIRELESS ACCESS SYSTEM - The present invention relates to allocating a radio resource in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM). Preferably, the present invention comprises receiving in a mobile station data associated with a radio resource allocation map from a base station, wherein the radio allocation map comprises control parameters for transmitting an uplink channel, wherein the uplink channel comprises at least one OFDM tile comprising a first set of subcarriers associated with representing at least part of an n-bit data payload, and a second set of subcarriers associated with representing at least part of a non-pilot m-bit data payload wherein each subcarrier carries a modulated data, and the first and the second set of subcarriers are exclusive to each other, and transmitting the uplink channel from the mobile station to the base station. | 12-31-2009 |
| 20100002607 | Collaborative mimo using sounding channel in multi-cell environment - A collaborative MIMO method using a sounding channel in a multi-cell environment is disclosed. The method includes acquiring, by a first base station providing a service for a first cell, first CSI of a first downlink channel between the first base station and a mobile station, transmitting, to a second base station, a signal including information requesting that the second base station providing a service for a second cell acquire second CSI of a second downlink channel between the second base station and the mobile station, and acquiring, by the second base station, the second CSI. The mobile station is served by the first base station. | 01-07-2010 |
| 20100002787 | WIRELESS COMMUNICATION SYSTEM WITH MULTIPLE TRANSMISSION ANTENNAS USING PILOT SUBCARRIER ALLOCATION - A method for allocating pilot subcarriers in a resource block for a wideband wireless mobile communication system having four (4) transmission antennas using orthogonal frequency division multiplexing (OFDMA) modulation is disclosed. In this method, pilot subcarriers are allocated in the resource block so that a group of consecutive data subcarriers separated from adjacent other group of consecutive data subcarriers by the pilot subcarriers has even number of subcarriers within an OFDMA symbol. | 01-07-2010 |
| 20100009691 | PERMUTATION DEVICE AND METHOD HAVING IMPROVED RESOURCE GRANULARITY FOR WIRELESS COMMUNICATIONS - A device and method for permuting subcarriers in a subframe which is divided into a plurality of frequency partitions in a wireless mobile communication system is disclosed. The method includes mapping, at a mobile station, physical resource units for localized resource allocation to a frequency partition of the plurality of frequency partitions in units of N_1 number of resource units, and physical resource units for distributed resource allocation to the frequency partition in units of N_d number of resource units, N_1 being different from N_d; and spreading, at the mobile station, subcarriers of the physical resource units for distributed resource allocation across the whole distributed resource allocations. | 01-14-2010 |
| 20100014481 | METHOD AND APPARATUS FOR TRANSMITTING REFERENCE SIGNAL, SETTING REFERENCE SIGNAL TRANSMISSION PATTERN, AND SETTING AND ALLOCATING RESOURCE BLOCK - A method for transmitting a reference signal, a method for establishing a reference-signal transmission pattern, and a method for establishing a block are disclosed. The reference-signal density is adjusted according to the request degree of the channel estimation performance, and then the reference signal is transmitted to a destination. As a result, the apparatus prevents prevent resources from being unnecessarily wasted, and acquires a high channel estimation performance as necessary, resulting in an increased production yield of a system. | 01-21-2010 |
| 20100014608 | DATA TRANSMITTING AND RECEIVING METHOD USING PHASE SHIFT BASED PRECODING AND TRANSCEIVER SUPPORTING THE SAME - A method for performing a precoding based on a generalized phase shift or a precoding based on an extended phase shift in a Multi-Input Multi-Output (MIMO) system employing several sub-carriers, and a transceiver for supporting the same are disclosed. A phase-shift-based precoding matrix is generalized by multiplying a diagonal matrix for a phase shift by a unitary matrix for maintaining orthogonality between sub-carriers. In this case, a diagonal matrix part may be extended by multiplying a precoding matrix for removing interference between sub-carriers by a diagonal matrix for a phase shift. By generalization and extension of the phase-shift-based precoding, a transceiver is more simplified, and communication efficiency increases. | 01-21-2010 |
| 20100017675 | SUPPORTING HYBRID AUTOMATIC RETRANSMISSION REQUEST IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING ACCESS RADIO ACCESS SYSTEM - A method of supporting a hybrid automatic retransmission request (HARQ) in an orthogonal frequency division multiplexing access (OFDMA) radio access system is disclosed. Preferably, the method comprises receiving a downlink data frame comprising a data map information element and a data burst comprising a plurality of layers, wherein each layer is encoded with a corresponding channel encoder, and wherein the data map information element is configured to support multiple antennas to achieve space time transmit diversity by providing control information associated with each one of the plurality of layers, wherein the control information comprises allocation of acknowledgement status channels corresponding to the plurality of layers, and transmitting in an uplink data frame a plurality of acknowledgement status, each acknowledgement status being associated with whether a corresponding layer of the plurality of layers is properly decoded. | 01-21-2010 |
| 20100020890 | WIRELESS COMMUNICATION SYSTEM WITH MULTIPLE TRANSMISSION ANTENNAS USING PILOT SUBCARRIER ALLOCATION - A method of allocating pilot subcarriers in a resource block for a wideband wireless mobile communication system with multiple transmission antennas using orthogonal frequency division multiplexing (OFDM) modulation is disclosed. In this method, pilot subcarriers are allocated to the resource block comprised of five (5) or seven (7) OFDM symbols so that only four (4) OFDM symbols of the resource block are allocated for pilot subcarriers. | 01-28-2010 |
| 20100020894 | METHOD FOR GENERATING CODEWORD IN WIRELESS COMMUNICATION SYSTEM - A method for generating a codeword that is insensitive to variations of a channel and easily extensible is provided. The method includes obtaining a primary unit by taking a row vector from an N(E(N−1) simplex code and mapping a control signal to the codeword. The simplex code is obtained by removing a first row from an N(ENorthogonal matrix. The codeword is obtained by combining a plurality of primary units. | 01-28-2010 |
| 20100027696 | METHOD OF DATA TRANSMISSION IN A WIRELESS COMMUNICATION SYSTEM - A method for transmitting data in a wireless communication system is provided. The method includes encoding one or more input data according to a specific coding rate and modulating the input data according to a specific modulation scheme, applying virtual antenna signaling to the one or more encoded and modulated input data based on a specific spatial multiplexing rate, and performing spatial processing on the input data, to which the virtual antenna signaling has been applied, and then transmitting the input data to a receiving end. | 02-04-2010 |
| 20100031117 | Method for specifying transport block to codeword mapping and downlink signal transmission method using the same - A method for specifying a transport block-to-codeword mapping relationship and a method for transmitting a downlink signal using the same are described. If a swap flag has a first logic value, a first transport block is mapped to a first codeword and a second transport block is mapped to a second codeword. If the swap flag has a second logic value, the first transport block is mapped to the second codeword and the second transport block is mapped to the first codeword. If the size of any one of two transport blocks is 0, the swap flag is not used. | 02-04-2010 |
| 20100046356 | METHOD FOR MULTIPLEXING CONTROL SIGNALS IN A MOBILE COMMUNICATION SYSTEM - Disclosed is a method for multiplexing control signals between a plurality of users when control signals for the plurality of users are allocated within one resource block. That is, a method for multiplexing control signals includes coding control signals for at least one user signals to correspond to a structure of a transmission block for the control signals among one or more dedicated resource block, multiplexing the control signals for the at least one user signals in the dedicated resource block, and transmitting the control signals, wherein the dedicated resource block is allocated for transmitting the control signals separately from data signals among a plurality of transmission resource blocks. A frequency division multiplexing (FDM) mode and a code division multiplexing (CDM) mode are used to multiplex the control signals for the plurality of users. | 02-25-2010 |
| 20100061482 | Method for transmitting data using phase shift based precoding and transceiver supporting the same - A method of transmitting data using cyclic delay in a multi-antenna system using a plurality of subcarriers and a transceiver supporting the same are disclosed. More particularly, a method of selecting a matrix (second matrix) for transforming a precoding matrix (first matrix) into a unitary matrix from a codebook by a prescribed reference is disclosed. An index for selecting the second matrix is calculated by a prescribed modulo operation in an open loop system or delivered as feedback information in a closed loop system. Diversity can be obtained by switching each column of the selected second matrix in accordance with time. In a multi-user system, a single second matrix can be determined by combining columns of the second matrix selected by each user. | 03-11-2010 |
| 20100067475 | METHOD OF TRANSMITTING FEEDBACK INFORMATION IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM)/OFDM ACCESS (OFDMA) MOBILE COMMUNICATION SYSTEM - A method of transmitting feedback information in a wireless communication system is disclosed. More specifically, the method comprises a mobile station (MS) which determines whether to transmit feedback information to a base station (BS) without solicitation from the BS. After determining to do so, the MS transmits a request message to request the BS to allocate an uplink resource for transmitting at least one unsolicited header and thereafter receives the uplink resource allocation from the BS. Lastly, the MS transmits the at least one unsolicited header via the allocated uplink resource. | 03-18-2010 |
| 20100085912 | METHOD FOR TRANSMITTING FEEDBACK INFORMATION - There is provided a method for enabling a user equipment to transmit feedback information. The method includes generating feedback data representing the feedback information, the feedback data expressed by a binary number having N bits, where N is an integer, the N bits comprising 2 levels, the feedback information represented by one of the 2 levels, wherein different types of the feedback information are assigned to different levels and transmitting the feedback data. Overheads incurred by transmission of feedback information can be reduced. | 04-08-2010 |
| 20100091680 | Method of transmitting control signal in wireless communication system - A method of transmitting a control signal in a wireless communication system includes receiving data or a control signal, and transmitting a feedback signal through a control channel in response to the data or the control signal, wherein the control channel comprises a plurality of mini-tiles in a plurality of tiles, each of which consists of at least one orthogonal frequency division multiplexing (OFDM) symbol in a time domain and at least one subcarrier in a frequency domain, and if the plurality of tiles have the same pilot pattern, the plurality of mini-tiles are cyclically selected from the plurality of tiles, and if the plurality of tiles have cyclically-arranged pilot patterns, the plurality of mini-tiles are selected at the same position from the plurality of tiles. | 04-15-2010 |
| 20100103949 | METHOD OF ALLOCATING REFERENCE SIGNALS IN MIMO SYSTEM - There is provided a method of allocating reference signals in a multiple-input multiple-output (MIMO) system. The method includes allocating a first reference signal, a second reference signal and a third reference signal in a first OFDM symbol so that the first reference signal, the second reference signal and the third reference signal do not overlap with each other and allocating the first reference signal, the second reference signal and a fourth reference signal in a second OFDM symbol so that the first reference signal, the second reference signal and the fourth reference signal do not overlap with each other. The first reference signal and the second signal are allocated in a regular intervals in a single OFDM symbol. | 04-29-2010 |
| 20100110914 | METHOD OF TRANSMITTING CHANNEL QUALITY INDICATOR IN WIRELESS COMUNICATION SYSTEM - A method of transmitting a channel quality indicator (CQI) includes obtaining CQIs for each of a plurality of sub-bands, a sub-band comprising a plurality of sub-carriers, dividing the plurality of sub-bands into a plurality of layers according to a CQI of a sub-band, a layer comprising at least one sub-band, obtaining a representative value of a representative layer, the representative layer including a sub-band having maximum CQI and transmitting the representative value of the representative layer. Signaling overhead due to CQI feedback can be reduced. | 05-06-2010 |
| 20100111015 | Method for transmitting downlink control messages in cellular system - A method for transmitting control messages is disclosed. The method includes grouping a plurality of control messages for at least one user equipment based on at least one criteria of whether or not uplink ACK/NACK channel indexes are allowed to be implicitly used in the control messages, whether or not the user equipment corresponding to the control messages is able to implicitly use the uplink ACK/NACK channel indexes, sizes of Information Elements (IEs) of the control messages, whether or not the control messages are segmented into a predetermined number of subblocks, MCS levels applied to the control messages, sizes of allocated IEs of the control messages after applying the MCS levels, and frequency partitions in which the IEs of the control messages are present, and transmitting the grouped control messages. The control messages included in each of the groups generated by grouping are equal in at said least one criteria. | 05-06-2010 |
| 20100113047 | Method for informing user equipment of downlink control message construction information in cellular system - A method for transmitting control messages from a base station to a user equipment in a cellular system is disclosed. The method includes grouping a plurality of control messages for at least one user equipment based on at least one criteria of whether or not uplink ACK/NACK channel indexes are allowed to be implicitly used in the control messages, whether or not the user equipment corresponding to the control messages is able to implicitly use the uplink ACK/NACK channel indexes, sizes of Information Elements (IEs) of the control messages, whether or not the control messages are segmented into a predetermined number of subblocks, MCS levels applied to the control messages, sizes of allocated IEs of the control messages after applying the MCS levels, and frequency partitions in which the IEs of the control messages are present, and transmitting the grouped control messages. | 05-06-2010 |
| 20100115369 | ALLOCATING DATA BURSTS AND SUPPORTING HYBRID AUTO RETRANSMISSION REQUEST IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING ACCESS RADIO ACCESS SYSTEM - The present invention relates to allocating data regions in an orthogonal frequency division multiplexing access system. The present invention comprises receiving a message comprising information for locating a data region of a data map allocated to a mobile station identified in the message for transmitting and receiving information, and identifying the data region of the data map allocated to the identified mobile station by reading the received message, wherein the data region is identified independent of identifying data regions of another data map. | 05-06-2010 |
| 20100118818 | METHOD OF RESOLVING OVERLAPS IN DATA TRANSMISSION AND USER EQUIPMENT THEREFOR - A user equipment and corresponding method of transmitting symbols by the user equipment in a wireless communication system. The method includes: generating a first symbol and a second symbol, each symbol including a cyclic prefix and a data part; manipulating a part of the second symbol to be ignored in transmission so that the first symbol and a remaining part of the second symbol are transmitted without overlapping, when the first symbol and the second symbol are overlapped due to a transmission timing advance of the second symbol; and transmitting the first symbol and the second symbol at each transmission timing to the base station. | 05-13-2010 |
| 20100118821 | METHOD OF TRANSMITTING FEEDBACK INFORMATION IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM)/ OFDM ACCESS (OFDMA) MOBILE COMMUNICATION SYSTEM - A method of transmitting feedback information in a wireless communication system is disclosed. More specifically, the method comprises a mobile station (MS) which determines whether to transmit feedback information to a base station (BS) without solicitation from the BS. After determining to do so, the MS transmits a request message to request the BS to allocate an uplink resource for transmitting at least one unsolicited header and thereafter receives the uplink resource allocation from the BS. Lastly, the MS transmits the at least one unsolicited header via the allocated uplink resource. | 05-13-2010 |
| 20100118822 | METHOD OF TRANSMITTING FEEDBACK INFORMATION IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM)/ OFDM ACCESS (OFDMA) MOBILE COMMUNICATION SYSTEM - A method of transmitting feedback information in a wireless communication system is disclosed. More specifically, the method comprises a mobile station (MS) which determines whether to transmit feedback information to a base station (BS) without solicitation from the BS. After determining to do so, the MS transmits a request message to request the BS to allocate an uplink resource for transmitting at least one unsolicited header and thereafter receives the uplink resource allocation from the BS. Lastly, the MS transmits the at least one unsolicited header via the allocated uplink resource. | 05-13-2010 |
| 20100118823 | METHOD OF TRANSMITTING FEEDBACK INFORMATION IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM)/ OFDM ACCESS (OFDMA) MOBILE COMMUNICATION SYSTEM - A method of transmitting feedback information in a wireless communication system is disclosed. More specifically, the method comprises a mobile station (MS) which determines whether to transmit feedback information to a base station (BS) without solicitation from the BS. After determining to do so, the MS transmits a request message to request the BS to allocate an uplink resource for transmitting at least one unsolicited header and thereafter receives the uplink resource allocation from the BS. Lastly, the MS transmits the at least one unsolicited header via the allocated uplink resource. | 05-13-2010 |
| 20100118824 | METHOD OF TRANSMITTING FEEDBACK INFORMATION IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM)/ OFDM ACCESS (OFDMA) MOBILE COMMUNICATION SYSTEM - A method of transmitting feedback information in a wireless communication system is disclosed. More specifically, the method comprises a mobile station (MS) which determines whether to transmit feedback information to a base station (BS) without solicitation from the BS. After determining to do so, the MS transmits a request message to request the BS to allocate an uplink resource for transmitting at least one unsolicited header and thereafter receives the uplink resource allocation from the BS. Lastly, the MS transmits the at least one unsolicited header via the allocated uplink resource. | 05-13-2010 |
| 20100118997 | Method of controlling in a wireless communication system having multiple antennas - A method of controlling interference in a wireless communication system is disclosed. A method for controlling interference by a transmitter of a wireless communication system with multiple antennas comprises generating a base codebook subset including at least one precoding matrix selected from a base codebook; transmitting a base codebook subset indication, which represents the at least one precoding matrix included in the base codebook subset, to a receiver; and precoding data using the base codebook subset or the base codebook. | 05-13-2010 |
| 20100128594 | METHOD OF RESOLVING OVERLAPS IN DATA TRANSMISSION AND USER EQUIPMENT THEREFOR - A user equipment and method of transmitting symbols by the user equipment in a wireless communication system. The method includes: generating a first symbol by adding a cyclic prefix (CP) to a first inverse fourier transformed samples, the CP being copied from the first fourier transformed samples; generating a next consecutive second symbol by adding a CP to a second inverse fourier transformed samples, the CP being copied from the second fourier transformed samples; removing samples overlapped with the first symbol from the next consecutive second symbol when the next consecutive second symbol is to be advanced in transmission timing; and transmitting the first symbol and the next consecutive second symbol to a base station. | 05-27-2010 |
| 20100128693 | METHOD OF RESOLVING OVERLAPS IN DATA TRANSMISSION AND USER EQUIPMENT THEREFOR - A user equipment and corresponding method of transmitting symbol by the user equipment in a wireless communication. The user equipment transmits a plurality of symbols to a base station, each symbol including a cyclic prefix and a data part. The method includes: receiving a timing adjustment command from the base station, the timing adjustment command advancing a transmission timing of symbol after a predetermined time; and transmitting a timing adjusted symbol to the base station. A length of the timing adjusted symbol is varied so that the timing adjusted symbol does not include an overlapping part with a previous symbol. | 05-27-2010 |
| 20100142363 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL INFORMATION IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus of transmitting control information in a wireless communication system is provided. A sequence corresponding to control information from a sequence set is determined. A reference modulation symbol set corresponding to a mini unit by modulating the sequence is generated. At least one reordered modulation symbol set is generated by reordering and repeating the reference modulation symbol set. The at least one reordered modulation symbol set is reordered in a unit of a subgroup. The reference modulation symbol set and the at least one reordered modulation symbol set are mapped to the plurality of mini units in the resource unit respectively. | 06-10-2010 |
| 20100166094 | Method for transmitting and receiving signals in open-loop spatial multiplexing mode - A method for transmitting and receiving signals in an open-loop spatial multiplexing transmission mode is described. If the number of transmit antennas is 2 and a rank is 2, a base station performs precoding according to a cyclic delay diversity scheme by a matrix in which a first matrix corresponding to an identity matrix, a second matrix corresponding to a diagonal matrix, and a third matrix corresponding to a unitary matrix are sequentially multiplied and transmits the precoded signals. This may be substantially the same as the case where the base station performs precoding using a matrix in which the second matrix corresponding to the diagonal matrix and the third matrix corresponding to the unitary matrix are multiplied and transmits the precoded signals. A user equipment estimates a transmission mode according to the received rank indicator and the number of transmit antennas and receives signals. | 07-01-2010 |
| 20100177727 | METHOD OF TRANSMITTING RECEIVING A DATA IN A WIRELESS COMMUNICATION SYSTEM - A method of transmitting and receiving data in a wireless communication system is disclosed. According to an embodiment of the present invention, a base station (BS) transmits downlink data to a first mobile station supporting a first system via a first zone of a frame and transmitting downlink data to a second mobile station supporting a second system via a second zone located behind the first zone by a frame offset on a time axis, wherein the first zone includes the odd number of OFDM symbols and wherein the frame offset is an offset between a start point of a frame for the first system and a start point of a frame for the second system. | 07-15-2010 |
| 20100177842 | CODEWORD GENERATION METHOD AND DATA TRANSMISSION METHOD USING THE SAME - A data transmission method includes encoding information bits to generate a codeword including a plurality of data symbols, the sum of the plurality of data symbols of the codeword being equal to zero, multiplexing a data symbol and a pilot with a subcarrier and transmitting multiplexed data symbol and pilot through the subcarrier. Since a data symbol and a pilot are multiplexed together to a subcarrier, channel estimation performance can be improved. | 07-15-2010 |
| 20100178927 | Method For Transmitting Pilot Allocation Information To User Equipment In A Multi-User Multiple Input Multiple Output System - A method for transmitting pilot allocation information from a base station for reception by at least one of a plurality of mobile stations participating in a Multi-User Multiple Input Multiple Output (MU-MIMO) communication, the method including the steps of generating pilot allocation information for the one mobile station, and transmitting the pilot allocation information for reception by the one mobile station, wherein the pilot allocation information includes at least one of a total number K of pilot streams allocated to the plurality of mobile stations, an index k representing a first pilot stream of one or more pilot streams allocated to the one mobile station among a plurality of pilot streams defined for a pilot pattern selected for the MU-MIMO communication, a number M of the pilot streams allocated to the one mobile station, and bitmap information indicating the pilot streams allocated to the one mobile station among the plurality of pilot streams defined for the pilot pattern. | 07-15-2010 |
| 20100202372 | Method and apparatus of transmitting feedback message in wireless communication system - A method and apparatus of transmitting a feedback message in a wireless communication system is provided. A mobile station receives information on a first period and a second period from a base station and transmits a first feedback message in every first period or a second feedback message in every second period to the base station over a primary fast feedback channel (PFBCH). The first feedback message comprises a channel quality indicator (CQI) for a subband selected from a plurality of subbands, and the second feedback message comprises a subband index of the selected subband. | 08-12-2010 |
| 20100202373 | Method and apparatus of transmitting uplink control signal in wireless communication system - A method and apparatus of transmitting an uplink control signal in a wireless communication system is provided. A user equipment receives pieces of resource allocation information about a plurality of respective uplink control channels, and transmits the uplink control signal through one of the plurality of uplink control channels. Radio resources sequentially adjacent to each other on a basis of one reference uplink control channel, selected from the plurality of uplink control channels, are allocated to the respective uplink control channels. And the resource allocation information comprises size of the radio resources allocated to each of the plurality of uplink control channels within a resource region in which the plurality of uplink control channels is configured. | 08-12-2010 |
| 20100202433 | SUPPORTING HYBRID AUTOMATIC RETRANSMISSION REQUEST IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING ACCESS RADIO ACCESS SYSTEM - A method of supporting a hybrid automatic retransmission request (HARQ) in an orthogonal frequency division multiplexing access (OFDMA) radio access system is disclosed. Preferably, the method comprises receiving a downlink data frame comprising a data map information element and a data burst comprising a plurality of layers, wherein each layer is encoded with a corresponding channel encoder, and wherein the data map information element is configured to support multiple antennas to achieve space time transmit diversity by providing control information associated with each one of the plurality of layers, wherein the control information comprises allocation of acknowledgement status channels corresponding to the plurality of layers, and transmitting in an uplink data frame a plurality of acknowledgement status, each acknowledgement status being associated with whether a corresponding layer of the plurality of layers is properly decoded. | 08-12-2010 |
| 20100208669 | Method and apparatus of composing uplink control channel in wireless communication system - A method and apparatus of composing an uplink control channel in a wireless communication system is provided. Uplink radio resources including a plurality of symbols and a plurality of subcarriers is divided into a plurality of Feedback Mini-Tiles (FMTs) each having two consecutive subcarriers. Reordering FMTs (RFMTs) is selected from the plurality of FMTs. And a feedback channel is composed using the plurality of consecutive RFMTs. | 08-19-2010 |
| 20100226290 | METHOD FOR COMMUNICATING DATA BETWEEN MOBILE STATION AND BASE STATION, AND MOBILE COMMUNICATION TERMINAL THEREOF - A method for transmitting and receiving data by a mobile station (MS), a method for transmitting and receiving data by a base station (BS), and a mobile communication terminal are provided. The method for transmitting and receiving data by an MS includes generating an uplink subframe by placing an uplink control channel so as to have a margin with a time allocated to a MAP of a downlink subframe and transmitting the uplink subframe to a BS. A new frame structure compatible with a full duplex FDD MS is applied in a mobile communication system. | 09-09-2010 |
| 20100226417 | DATA TRANSMITTING AND RECEIVING METHOD USING PHASE SHIFT BASED PRECODING AND TRANSCEIVER SUPPORTING THE SAME - A method for performing a precoding based on a generalized phase shift or a precoding based on an extended phase shift in a Multi-Input Multi-Output (MIMO) system employing several sub-carriers, and a transceiver for supporting the same are disclosed. A phase-shift-based precoding matrix is generalized by multiplying a diagonal matrix for a phase shift by a unitary matrix for maintaining orthogonality between sub-carriers. In this case, a diagonal matrix part may be extended by multiplying a precoding matrix for removing an interference between sub-carriers by a diagonal matrix for a phase shift. By generalization and extension of the phase-shift-based precoding, a transceiver is more simplified, and a communication efficiency increases. | 09-09-2010 |
| 20100254339 | COMMUNICATING NON-COHERENT DETECTABLE SIGNAL IN BROADBAND WIRELESS ACCESS SYSTEM - The present invention relates to allocating a radio resource in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM). Preferably, the present invention comprises receiving in a mobile station data associated with a radio resource allocation map from a base station, wherein the radio allocation map comprises control parameters for transmitting an uplink channel, wherein the uplink channel comprises at least one OFDM tile comprising a first set of subcarriers associated with representing at least part of an n-bit data payload, and a second set of subcarriers associated with representing at least part of a non-pilot m-bit data payload wherein each subcarrier carries a modulated data, and the first and the second set of subcarriers are exclusive to each other, and transmitting the uplink channel from the mobile station to the base station. | 10-07-2010 |
| 20100254471 | METHOD OF TRANSMITTING POWER INFORMATION IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting power information in a wireless communication system is provided. The method includes: determining energy per resource element (RE) to which a reference signal or data is mapped for downlink transmission; and transmitting power information of the reference signal and the data, wherein the reference signal comprises a channel state indication-reference signal (CSI-RS) for channel state measurement, power information of the CSI-RS is denoted by a ratio of power for a CSI-RS RE and power for a data RE of an orthogonal frequency division multiplexing (OFDM) symbol on which only data is transmitted or power for a cell-specific RS (CRS) RE used for channel state measurement and data demodulation of different OFDM symbols. | 10-07-2010 |
| 20100273514 | METHOD FOR PERFORMING CoMP OPERATION AND TRANSMITTING FEEDBACK INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method for performing a Coordinated Multi-Point (CoMP) operation and transmitting feedback information in a wireless communication system is disclosed. The method includes measuring interference levels or noise and interference variances of reference signals received from one or more neighbor cells, and transmitting to a serving Base Station (BS) information about the measured interference levels or noise and interference variances, and information about a Precoding Matrix Index (PMI) that a mobile station (MS) wants to restrict or recommend for a neighbor cell performing the CoMP operation. | 10-28-2010 |
| 20100278225 | Method for determining modulation and coding scheme - There is provided a method of determining a Modulation and Coding Scheme (MCS). The method includes predicting an error rate of a symbol and determining a MCS of the symbol using the error rate. Since a MCS level is determined using an estimated error rate and user data is scheduled, multi-user diversity gain can be obtained and the transmission rate can be improved. | 11-04-2010 |
| 20100278278 | METHOD FOR SETTING PRECODER IN OPEN LOOP MIMO SYSTEM - A feedback method of a user equipment in an open loop Multiple-Input Multiple-Output (MIMO) system is disclosed. The method includes, receiving one of a plurality of modes determined according to types of resources to be used for performing feedback from a base station, and selecting a precoding matrix from a codebook subset corresponding to the received mode, applying the selected precoding matrix, and transmitting feedback information. Different codebook subsets are configured with respect to the plurality of modes, and the codebook subset is configured by extracting a predetermined number of elements from a base codebook based on a predetermined criterion considering the characteristics of the modes. | 11-04-2010 |
| 20100298003 | METHOD FOR TRANSMITTING PILOT ALLOCATION INFORMATION TO USER EQUIPMENT IN A MULTI-USER MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM - A method for transmitting pilot allocation information from a base station for reception by at least one of a plurality of mobile stations participating in a Multi-User Multiple Input Multiple Output (MU-MIMO) communication, the method including the steps of generating pilot allocation information for the one mobile station, and transmitting the pilot allocation information for reception by the one mobile station, wherein the pilot allocation information includes at least one of a total number K of pilot streams allocated to the plurality of mobile stations, an index k representing a first pilot stream of one or more pilot streams allocated to the one mobile station among a plurality of pilot streams defined for a pilot pattern selected for the MU-MIMO communication, a number M of the pilot streams allocated to the one mobile station, and bitmap information indicating the pilot streams allocated to the one mobile station among the plurality of pilot streams defined for the pilot pattern. | 11-25-2010 |
| 20100298031 | METHOD FOR TRANSMITTING AND RECEIVING SIGNALS USING MULTI-BAND RADIO FREQUENCIES - A method for transmitting an information unit of a specific layer above a physical layer through a plurality of frequency allocation bands managed by the specific layer and transmitting control information identifying each of the plurality of frequency allocation bands. The control information includes a second ID into which a first ID has been converted, the first ID identifying each of the plurality of frequency allocation bands in the physical layer, the second ID identifying each of the plurality of frequency allocation bands managed by the specific layer in the specific layer. To accomplish this, a timing offset is applied to the entirety of a frame or to a preamble (synchronous channel) so that the timing offset is used as the ID. Applying a timing offset to the entirety of a frame or to a preamble (synchronous channel) can achieve an advantage of PAPR reduction. | 11-25-2010 |
| 20100316154 | METHOD FOR PERFORMING VIRTUAL MULTIPLE ANTENNA TRANSMISSION IN UPLINK USING FEEDBACK INFORMATION AND MOBILE TERMINAL SUPPORTING THE SAME - A method and apparatus for performing virtual multiple antenna transmission using feedback information in a closed-loop multiple antenna system is provided. Virtual multiple antenna control information is fed back from a receiving end that has determined the virtual multiple antenna control information taking into consideration a communication condition of a transmitting end. Virtual multiple antenna transmission is performed in uplink using the feedback information. The transmitting end may also primarily determine at least part of the virtual antenna control information and transmit the determined information to the receiving end. This method allows adaptive virtual multiple antenna transmission suitable for a channel condition in closed-loop uplink, thereby improving the communication performance. | 12-16-2010 |
| 20100317382 | NETWORK ACCESS METHOD IN MOBILE COMMUNICATION SYSTEM AND TERMINAL SUPPORTING THE SAME - With regard to any nucleotide and/or amino acid sequence disclosed in the international application and necessary to the claimed invention, the international search was carried out on the basis of: | 12-16-2010 |
| 20100322349 | METHOD FOR TRANSMITTING DATA USING CYCLIC DELAY DIVERSITY - A method of transmitting data using cyclic delay in a multi-antenna system using a plurality of subcarriers is disclosed. Data is transmitted through a phase shift based precoding scheme enhanced from a related art phase shift diversity and a related art precoding scheme. A generalized cyclic delay diversity scheme is selectively applied to a phase shift based precoding scheme or a related art precoding scheme executed on a frequency domain is transferred to a time domain to be applied as a generalized cyclic delay diversity scheme. Accordingly, complexity of a receiver is reduced and communication efficiency can be enhanced. | 12-23-2010 |
| 20110009158 | METHOD OF EXECUTING HANDOVER IN A MOBILE COMMUNICATION SYSTEM - Disclosed are methods of executing a handover related operation in a power saving mode in accordance with handover triggering information. One of the methods of executing handover of a mobile station in a mobile communication system comprises determining an enabled status of at least one handover related operation in a specific operation mode between the mobile station (MS) and a network, receiving control information related to the at least one handover related operation from the net work, entering the specific operation mode, changing the enabled status of the at least one handover related operation in the specific operation mode, and performing the enabled handover related operation in accordance with the changed enabled status and the control information. | 01-13-2011 |
| 20110013615 | METHOD AND APPARATUS FOR TRANSMITTING UPLINK CONTROL INFORMATION - A method of transmitting uplink control information of a user equipment is provided. The method includes: generating the uplink control information repeatedly as many as uplink data transmission layers; modulating the uplink control information to generate a plurality of repeated modulation symbol; applying a precoding matrix to the plurality of repeated modulation symbols to generate a plurality of first precoded symbol; and transmitting the plurality of first precoded symbols respectively through a plurality of antennas in an uplink subframe comprising a plurality of single carrier frequency division multiple access (SC-FDMA) symbols in a time domain and a plurality of subcarriers in a frequency domain. | 01-20-2011 |
| 20110026419 | METHOD AND APPARATUS FOR CONTROLLING UPLINK POWER IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for controlling uplink transmit power in a wireless communication system are disclosed. The method includes determining an uplink transmit power for each of the plurality of transmission channels, and sequentially allocating the determined uplink transmit powers to the transmission channels in a descending order of predetermined priority levels of the transmission channels, within a maximum available transmit power of the user equipment. The priority levels of the transmission channels are predetermined so that control channels, a sounding channel, a data channel, and a bandwidth request channel have priority levels in a descending order. | 02-03-2011 |
| 20110026627 | METHOD OF TRANSMITTING MIDAMBLE - A method of transmitting a midamble for channel estimation of multiple antennas performed by a base station in a system having segregated uplink and downlink frequency bands is provided. The method includes transmitting midamble information indicating presence of the midamble within a downlink frame to a user equipment (UE), and transmitting the midamble on a single downlink subframe among at least one downlink subframe included in the downlink frame or on a common zone to the UE by using the multiple antennas. A scheduling overhead of a base station and other overheads can be reduced by decreasing the number of transmissions of a midamble on one downlink frame, and thus limited radio resources can be effectively used. | 02-03-2011 |
| 20110026637 | METHOD AND APPARATUS FOR TRANSMITTING PILOT SIGNAL IN A MULTIPLE INPUT MULTIPLE OUTPUT WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting a pilot signal in a Multiple Input Multiple Output (MIMO) wireless communication system are disclosed. The method sets a power of pilot signal to be transmitted in a pilot pattern according to a predefined ratio of a total power of the pilot signal to a total power of data tones being transmitted together with the pilot signal on a subframe. | 02-03-2011 |
| 20110032897 | METHOD OF ALLOCATING ACKNOWLEDGEMENT CHANNEL - Various methods for efficiently transmitting data and various methods for allocating an ACK channel in a wireless access system are disclosed. In addition, various frame structures and MAC header structures for use in allocating an ACK channel are disclosed. A method for allocating an ACK channel includes receiving first data including ACK channel position information, transmitting an ACK signal on an ACK channel indicated by the ACK channel position information, and starting an ACK channel timer. | 02-10-2011 |
| 20110038320 | METHOD FOR ACQUIRING MULTI-CELL SPECIFIC MESSAGE IN WIRELESS COMMUNICATION SYSTEM - A method for acquiring a multi-cell specific message in a wireless communication system includes receiving a downlink preamble, receiving the multi-cell specific message weighted with the downlink preamble, and decoding the weighted multi-cell specific message by using the received downlink preamble. Accordingly, since a preamble is used to transmit a multi-cell specific message, there is no need to transmit an additional signal in order to estimate a channel of the multi-cell specific message. In addition, a user equipment can acquire the multi-cell specific message by simply performing decoding. | 02-17-2011 |
| 20110043391 | METHOD AND APPARATUS OF GENERATING CODEWORDS IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus for generating and transmitting codewords is provided. The method includes receiving information bits with a variable length, selecting vectors by the length of the information bits from a generator matrix, and generating a codeword based on the information bits and the generator matrix. Codewords with a certain length providing a coding performance with respect to received variable information bits can be obtained. | 02-24-2011 |
| 20110051834 | METHOD OF TRANSMITTING OF DATA AND CONFIGURING A CODEBOOK IN MULTI ANTENNA SYSTEM - Methods of controlling a transmission power and configuring a codebook in a multi-antenna system to solve a transmission power unbalance between antennas are disclosed. The method of transmitting data in a multi-antenna system includes (A) transmitting one or more pilot signals within a first symbol region through a first antenna unit, and (B) transmitting one or more pilot signals within a second symbol region through a second antenna unit, wherein data within the first symbol region is transmitted through the second antenna unit, and data within the second symbol region is transmitted through the first antenna unit. According to the present invention, since a transmission power unbalance between antennas is solved, a transmission power can be uniformly assigned to each antenna and channel estimation can be easily performed. Moreover, a power amplifier having a uniform amplification range can be used and designed. | 03-03-2011 |
| 20110058527 | METHOD AND DEVICE FOR ALLOCATING A BROADCAST CHANNEL IN A WIRELESS MOBILE COMMUNICATION SYSTEM - A method for receiving a superframe header at a mobile station in a wireless mobile communication system is disclosed. The method comprises receiving a sub-frame including the superframe header and a first data channel and decoding the received superframe header. Herein, the superframe header is located within a predetermined physical frequency band and the predetermined physical frequency band includes a synchronization channel. | 03-10-2011 |
| 20110064156 | METHOD OF TRANSMITTING FEEDBACK INFORMATION FOR PRECODING AND PRECODING METHOD - Precoding methods and method for performing precoding and methods of transmitting feedback information for precoding or transmitting a signal using a multi-codebook and method of transceiving precoding information in a multi-antenna system, where a signal transmitting method in a multi-antenna system, and more particularly, a method of transceiving precoding matrix information for a multi-input multi-output (MIMO) system is disclosed. The present invention proposes a method of performing communications using an expanded unitary matrix generated from shifting a phase of a base unitary matrix. The present invention is applicable to single user MIMO, multi-user MIMO, beam forming, etc. | 03-17-2011 |
| 20110064159 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK SIGNAL IN A MIMO WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting a downlink signal in a multiple input multiple output (MIMO) wireless communication system is disclosed. A method for receiving a downlink signal from a base station to a user equipment in a multiple input multiple output (MIMO) system, which supports dual layer transmission based on first and second antenna ports, comprises receiving downlink control information (DCI) through a downlink control channel; and receiving downlink data through a downlink data channel, the downlink data including one or more of a first transport block and a second transport block, wherein the downlink control information includes a new data indicator (NDI) for each of the first and second transport blocks, and if the first transport block is disabled and the second transport block is enabled, the new data indicator for the first transport block indicates an antenna port through which the second transport block is received. | 03-17-2011 |
| 20110090976 | METHOD FOR TRANSMITTING BEAM FORMING INFORMATION AND A METHOD FOR TRACKING POSITION OF A MOBILE STATION IN MULTI INPUT MULTI OUTPUT SYSTEM USING CODEBOOK-BASED BEAM FORMING SCHEME - A method for transmitting feedback information in a codebook-based multiple-input multiple-output (MIMO) system is disclosed. For example, a method for transmitting beamforming information in a MIMO system using a codebook-based beamforming scheme includes receiving a signal and estimating a reception channel, and transmitting beamforming information selected through the estimated channel information from a codebook which is updated using phase shift matrices having a phase value as a parameter and using previous beamforming information. | 04-21-2011 |
| 20110098076 | METHOD AND APPARATUS FOR CONTROLLING UPLINK POWER IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for controlling uplink power in a wireless communication system are disclosed. The uplink power controlling method includes receiving target Signal-to-Interference plus Noise Ratio (SINR) parameters and an uplink noise and interference level from a base station, determining an uplink power based on a target SINR and an estimated average power level of noise and interference of a user equipment, the target SINR being determined using the target SINR parameters and the estimated average power level of noise and interference of the user equipment being calculated using the uplink noise and interference level, and receiving at least one of selectively transmitted first and second offsets from the base station and adjusting the uplink power based on the received at least one of the first and second offsets. | 04-28-2011 |
| 20110103218 | METHOD AND APPARATUS OF DOWNLINK SUBCHANNELIZATION IN WIRELESS COMMUNICATION SYSTEM - A method of downlink subchannelization in a wireless communication system includes: transmitting a network entry and network discovery information including an open loop (OL) region parameter; and mapping a physical resource unit (PRU) to a contiguous resource unit (CRU) or a distributed resource unit (DRU) with respect to ith frequency partition based on the OL region parameter, wherein a permutation sequence used for mapping a PRU of the ith frequency partition (PRU | 05-05-2011 |
| 20110110405 | DATA TRANSMITTING AND RECEIVING METHOD USING PHASE SHIFT BASED PRECODING AND TRANSCEIVER SUPPORTING THE SAME - A method for performing a precoding based on a generalized phase shift or a precoding based on an extended phase shift in a Multi-Input Multi-Output (MIMO) system employing several sub-carriers, and a transceiver for supporting the same are disclosed. A phase-shift-based precoding matrix is generalized by multiplying a diagonal matrix for a phase shift by a unitary matrix for maintaining orthogonality between sub-carriers. In this case, a diagonal matrix part may be extended by multiplying a precoding matrix for removing interference between sub-carriers by a diagonal matrix for a phase shift. By generalization and extension of the phase-shift-based precoding, a transceiver is more simplified, and communication efficiency increases. | 05-12-2011 |
| 20110111789 | APPARATUS AND METHOD FOR CONTROLLING TRANSMISSION POWER IN A WIRELESS COMMUNICATION SYSTEM USING FRACTIONAL FREQUENCY REUSE - A method for acquiring FFR power pattern of Frequency Partitions (FPs) at a mobile station (MS) in a wireless communication system using Fractional Frequency Reuse (FFR) is disclosed. The method includes receiving a preamble from a base station (BS); and acquiring a FFR power pattern for a reuse-1 partition and reuse-N partitions using the received preamble, wherein the FFR power pattern is determined based on a segment identifier (ID), the reuse-N partitions include N frequency partitions, each frequency partition has a power level with a range of FP1_power level to FPN_power level, a power-boosted FP in the reuse-N partitions is a partition whose power level is the FP1_power level. | 05-12-2011 |
| 20110128917 | METHOD FOR TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM - A method for transmitting data in a multiple antenna system comprises the steps of: generating a transmission signal in plural antennas through the application of a precoding eight matrix to first and second antenna clusters including the plural antennas, and transmitting the transmission signal. The precoding weight matrix is a block diagonal matrix that is configured in a precoding weight corresponding to first and second antenna clusters respectively. The precoding weight of the first antenna cluster is selected according to a channel condition, and the precoding weight of the second antenna cluster is selected regardless of the channel condition but according to a rule. | 06-02-2011 |
| 20110135033 | METHOD FOR TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM - A method of sending data in a multiple antenna system includes the steps of generating a transmission signal by applying channel-dependent precoding to a first antenna cluster and a second antenna cluster, each comprising a plurality of antennas, wherein the channel-dependent precoding is performed by a precoding weight matrix in which a precoding weight for each of the antenna clusters has a block diagonal form and the precoding weight is represented by P×V for a number of transmission antennas P, included in each of the antenna clusters, and a number of layers V applied to each of the antenna clusters (P and V are an integer greater than 0) and sending the transmission signal. | 06-09-2011 |
