Patent application number | Description | Published |
20080205334 | APPARATUS AND METHOD FOR DATA TRANSMISSION/RECEPTION IN MOBILE TELECOMMUNICATION SYSTEM - Disclosed is an apparatus and method for data transmission/reception in a mobile telecommunication system, and more particularly to an apparatus and method for data transmission/reception in a mobile telecommunication system employing an Orthogonal Frequency Division Multiplexing (OFDM) scheme. The method includes identifying a CHannel IDentifier (CH_ID), which represents a first resource indicated by a Forward Shared Control CHannel (F-SCCH) among all resources; identifying a second resource indicated by resource assignment information for group terminals; and when the first resource includes all or a part of the second resource, and a third resource unused by the group terminals exists in the entire or part of the second resource, transmitting/receiving data by means of the third resource and a fourth resource, which is a remaining part of the first resource excluding the second resource. | 08-28-2008 |
20080212550 | METHOD AND APPARATUS FOR MANAGING CONTROL CHANNEL IN A MOBILE COMMUNICATION SYSTEM USING MULTIPLE ANTENNAS - A method for transmitting and receiving a control channel message in a mobile communication system using multiple antennas is provided. A base station determines whether a common pilot is used or a dedicated pilot is used. It also determines whether a corresponding Multiple Input Multiple Output (MIMO) mode is a Multi-CodeWord (MCW) MIMO mode or a Single CodeWord (SCW) MIMO mode, and determines whether knockdown precoding is used or ready-made precoding is used. The base station generates a control channel message field including a pilot pattern and a precoding type according to the determination results, and transmits the generated control channel message to the terminal. The terminal receives a control channel message transmitted from a base station. The terminal determines whether a common pilot is used or a dedicated pilot is used, whether a corresponding MIMO mode is an MCW MIMO mode or an SCW MIMO mode, and whether knockdown precoding is used or ready-made precoding is used. The terminal analyzes the control channel message field according to the determination results, and determines a data reception method according to the analysis result. | 09-04-2008 |
20080212700 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CONTROL CHANNEL MESSAGE IN A MIMO MOBILE COMMUNICATION SYSTEM - A method and apparatus for transmitting and receiving a control channel message in a Multiple Input Multiple Output (MIMO) mobile communication system are provided, in which a control channel message generator generates a pilot/MIMO field indicating at least one of a pilot format, a MIMO transmission rank being a number of transmission layers for transmitting encoded packet streams, and precoding information for MIMO data transmission, and outputs a control channel message including the pilot/MIMO field, and a transmission module converts the control channel message to a radio signal and transmits the radio signal to an MS. In the case of using common pilots for data demodulation and at least one of knock-down precoding and ready-made precoding for the MIMO transmission, the pilot/MIMO field includes information about the at least one precoding. In the case of dedicated pilots for data demodulation, the pilot/MIMO field indicates a format of the dedicated pilots. | 09-04-2008 |
20080225786 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING A CONTROL CHANNEL IN A MOBILE COMMUNICATION SYSTEM - A method and apparatus for transmitting a control channel of a base station in a mobile communication system. A downlink control channel signal generator generates a downlink control channel signal to be transmitted to a User Equipment (UE). A control channel candidate processor calculates a control channel decoding attempt order according to a state of the downlink channel. A controller determines a control channel candidate to be used, according to the calculated decoding attempt order. A mapper maps the generated control channel signal to the determined control channel candidate. A transmission processor wirelessly transmits the mapped signal. | 09-18-2008 |
20080225964 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING FORWARD SHARED CONTROL CHANNEL IN A MOBILE COMMUNICATION SYSTEM - A method is provided for transmitting a downlink shared control channel including a control signal necessary for restoring a transmission data signal in a mobile communication system that transmits a data signal using multiple antennas. It is determined whether the transmission data signal is coded with two or more codewords before being transmitted. One of a first element index of a sub-codebook configured only with a one codeword-dedicated precoding in a precoding codebook and a second element index of a sub-codebook configured only with a more-than-two codeword- dedicated precoding is selected, according to the determination result. A control channel is generated by including the selected element index in the precoding information. The generated control channel is mapped to a particular resource block and the mapped control channel is transmitted to a particular reception apparatus. | 09-18-2008 |
20080240274 | PRECODING APPARATUS AND METHOD IN A WIRELESS COMMUNICATION SYSTEM USING MULTIPLE INPUT MULTIPLE OUTPUT - A transmission apparatus in a Multiple Input Multiple Output (MIMO)-based wireless communication system. The transmission apparatus includes at least two antenna groups each having at least two antennas, wherein the antenna groups are spaced apart by a first distance and transmit antennas in each antenna group are spaced apart by a second distance which is shorter than the first distance. A channel coding and modulation unit channel-codes and modulates a desired transmission data stream. A precoding unit precodes the channel-coded and modulated signal separately for each antenna group and each antenna in the same antenna group. Thereafter, a transmission processing unit transmission-processes the output signal from the precoding unit. | 10-02-2008 |
20080267122 | METHOD AND APPARATUS FOR MAPPING/DEMAPPING MODULATION SYMBOLS IN A MOBILE COMMUNICATION SYSTEM - A method for mapping wireless resources of reference symbols for channel state estimation and modulation symbols for user information transmission in a transmitter of an Orthogonal Frequency Division Multiplexing (OFDM) mobile communication system is disclosed. The mapping method includes channel-encoding and modulating a user information stream to be transmitted, and then generating a systematic symbol stream and a parity symbol stream; and preferentially arranging systematic modulation symbols in resource elements of a symbol including no reference symbol, and then arranging parity modulation symbols in remaining resource elements. | 10-30-2008 |
20080273479 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CONTROL CHANNELS BY RESTRICTING A SET OF THE CONTROL CHANNELS IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting a control channel in a base station for a wireless communication system. The base station transmits information including a number of channel elements constituting control channels, to a terminal; establishes a set of control channels that the terminal can receive, within the number of channel elements using an identifier (ID) of the terminal; and transmits control information to the terminal through a selected control channel among the control channels. The terminal is restricted to monitor only a proper number of control channels established without the need to monitor all control channels, thereby reducing reception complexity and avoiding unnecessary battery consumption. | 11-06-2008 |
20080273491 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA IN AN ORTHOGONAL FREQUENCY MULTIPLEXING SYSTEM - A method and apparatus for transmitting and receiving data in an Orthogonal Frequency Division Multiplexing (OFDM) system are provided, in which a Base Station (BS) generates a signal of a broadcast channel, determines whether the broadcast channel signal includes Reference Symbols (RSs) used for channel estimation, determines to apply a maximal puncturing pattern to a Resource Block that defines the broadcast channel, if the broadcast channel signal includes Rs, includes puncturing information about a downlink signal in the broadcast channel signal, maps the broadcast channel signal including the puncturing information to Resource Elements according to the maximal puncturing pattern, and transmits the mapped broadcast channel signal. | 11-06-2008 |
20080293424 | METHOD AND APPARATUS FOR ALLOCATING ACKCH RESOURCES IN A WIRELESS COMMUNICATION SYSTEM - A method for allocating physical resources to an Acknowledgement (ACK)/Negative Acknowledgement (NACK) signal channel representative of a response signal in a wireless communication system. The method includes grouping ACK/NACK signal channels corresponding to a plurality of resource blocks used for transmission of a data channel or a control channel into a plurality of groups so ACK/NACK signal channels having consecutive indexes do not belong to the same group; and allocating same frequency resources to ACK/NACK signal channels belonging to the same ACK/NACK signal channel group and allocating orthogonal sequences so ACK/NACK signal channels in each ACK/NACK signal channel group are distinguished in a code domain. | 11-27-2008 |
20080317146 | APPARATUS AND METHOD FOR CHANNEL-INTERLEAVING AND CHANNEL-DEINTERLEAVING DATA IN A WIRELESS COMMUNICATION SYSTEM - An interleaving and deinterleaving apparatus and method in a wireless communication system are provided, in which it is determined whether coded bits to be transmitted in one modulation symbol are selected from a plurality of code blocks. The coded bits are interleaved on a modulation symbol basis if the coded bits to be transmitted in the modulation symbol are selected from a plurality of code blocks. | 12-25-2008 |
20090003274 | APPARATUS AND METHOD FOR TRANSMITTING CONTROL CHANNEL FOR FREQUENCY RESOURCE ALLOCATION IN A WIRELESS COMMUNICATION SYSTEM - A method is provided for transmitting a control channel for resource allocation to a terminal by a base station in an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system. An additional resource allocation indicator is set indicating whether the number of consecutive resource block sets allocated to a terminal is greater than one. A reference control channel is generated including reference resource allocation information for a first consecutive resource block set and the set additional resource allocation indicator. An additional control channel using additional resource allocation information is generated, when there are one or more additional consecutive resource block sets. At least one of the generated reference control channel and the generated additional control channels is encoded before transmission. | 01-01-2009 |
20090003486 | APPARATUS AND METHOD FOR MAPPING SYMBOLS TO RESOURCES IN A MOBILE COMMUNICATION SYSTEM - A method and apparatus for mapping coded data symbols to resources in a mobile communication system. An S/P converter converts a serial signal including user data or control information into a plurality of parallel signals. A DFT unit performs Discrete Fourier Transform (DFT) on the parallel signals output from the S/P converter. A controller controls the DFT unit so that among the signals output from the S/P converter, a control channel is mapped in the maximum available resources to which the control channel can be mapped, among the resources included in a resource block, and data symbols are mapped to the remaining resources, except for the maximum available resources to which the control channel can be mapped. A subcarrier mapper allocates the signals output from the DFT unit to subcarriers. An RF processor converts a signal output from the subcarrier mapper into a radio signal. | 01-01-2009 |
20090038077 | SLEEPING POSTURE SUPPORTING APPARATUS - Provided is a sleeping posture supporting apparatus for supporting and maintaining a person's entire body lying at full length (lying on one side) and increasing breathing capacity while sleeping so as to prevent the person from snoring, thus allowing the person to have a good sleep. | 02-12-2009 |
20090041139 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING UPLINK CONTROL CHANNELS IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting/receiving pilot symbols for demodulation of control channel information in the uplink of a wireless communication system are provided. When an Evolved Node B (ENB) expects to receive both the Channel Quality Information (CQI) and the Acknowledgement (ACK)/Negative ACK (NACK) from a User Equipment (UE) in a certain subframe, if the UE transmits only the CQI channel, the ENB is prevented to detect the nonexistent ACK/NACK information from the CQI channel, thereby avoiding false alarm. | 02-12-2009 |
20090055703 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING THE HYBRID-ARQ ACK/NACK SIGNAL IN MOBILE COMMUNICATION SYSTEM - An apparatus and method for transmitting/receiving a Hybrid Automatic Repeat reQuest (HARQ) Acknowledge/Negative acknowledge (ACK/NACK) signal in a mobile communication system. The present invention distributes a CDM segment, to which an ACK/NACK signal is mapped, in the frequency domain of an OFDM symbol, and repeatedly transmits the CDM segment, thereby providing diversity gain in the time-frequency domain. Further, the present invention provides a mapping rule for distributing transmit power between OFDM symbols to which the ACK/NACK signal is mapped and transmitted, thereby preventing the case where a particular OFDM symbol is power-overloaded, and thus contributing to improvement of the entire system performance. | 02-26-2009 |
20090059884 | Transmission methods for downlink ACK/NACK channels - A method from transmitting data via multiple antennas. In this method, four information bits to be transmitted are multiplexed by using either one of a code division multiplexing scheme or a second code division multiplexing scheme combined with a real and imaginary multiplexing scheme, to generate a code division multiplexed symbol including four vectors. Then, the code division multiplexed symbol is repeatedly transmitted by alternatively applying two transmit diversity schemes via four transmission antennas. | 03-05-2009 |
20090097447 | METHOD AND APPARATUS FOR ALLOCATING RESOURCES OF A CONTROL CHANNEL IN A MOBILE COMMUNICATION SYSTEM USING ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING - A method is provided for allocating resources of a control channel in a mobile communication system using Orthogonal Frequency Division Multiplexing (OFDM). The method includes, when a time index and a frequency index of available Resource Elements (REs) are defined as l and k, respectively, dividing the available REs in a two-dimensional structure of (k, l); and time-first-allocating each RE to a plurality of RE groups while increasing the time index l for each frequency index k from an initial value up to a predetermined range. | 04-16-2009 |
20090245101 | APPARATUS AND METHOD FOR TRANSMITTING REVERSE PACKET DATA IN MOBILE COMMUNICATION SYSTEM - A method for controlling a reply signal transmission in a mobile communication system. The method includes determining whether an error is detected in the received data through the radio channel, generating a reply signal according to the error detection, determining a repetition control signal with a value that differs according to a data transmission rate, repeatedly replicating the reply signal according to the repetition control signal, and transmitting the replicated reply signal through the radio channel. | 10-01-2009 |
20090316756 | APPARATUS AND METHOD FOR TRANSMISSION OF SOUNDING REFERENCE SIGNAL IN UPLINK WIRELESS COMMUNICATION SYSTEMS WITH MULTIPLE ANTENNAS AND SOUNDING REFERENCE SIGNAL HOPPING - A sounding reference signal transmission method which is efficient in an uplink wireless telecommunications system using a multiple antenna technique and sounding reference signal hopping. A terminal using the multiple antenna technique is equipped with a plurality of antennas, and a base station receives the sounding reference signal transmitted from these antennas and estimates the uplink channel state of each antenna. Moreover, the sounding reference signal performs frequency hopping so that the base station determines the channel condition for the entire bandwidth to which data is transmitted in the uplink system. The sounding reference signal is transmitted through an antenna pattern in which the sounding reference signal can be transmitted through the entire data transmission bandwidth of the uplink system for each antenna of the terminal without additional overhead in this environment. | 12-24-2009 |
20100039970 | METHOD AND APPARATUS FOR SUPPORTING MULTIPLE REFERENCE SIGNALS IN OFDMA COMMUNICATION SYSTEMS - Methods and apparatuses are described for a Node B to transmit Reference Signals (RS) from multiple antennas to enable User Equipments (UEs) to perform demodulation of received information signals and to estimate Channel Quality Indication (CQI) metrics. To minimize overhead and enable backward compatible operation with legacy systems, RS from a first set of Node B antennas are transmitted in every transmission time interval and substantially over the whole operating BandWidth (BW). RS from a second set of Node B antennas serving for CQI estimation are periodically transmitted, substantially over the whole operating BW, with transmission period informed to UEs through broadcast signaling by the Node B and starting transmission sub-frame determined from the identity of the cell served by the Node B. RS from the second set of antennas, and new RS from the first set of antennas, serving for demodulation of information signals have substantially the same BW as the information signals which can be smaller than the operating BW. | 02-18-2010 |
20100111107 | DEVICE AND METHOD FOR TRANSMITTING DOWNLINK CONTROL INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A Downlink Control Information (DCI) processing device and method for a wireless communication system that encodes/decodes downlink control information based on a payload size of DCI format. The method includes determining a payload size of a first DCI format; and determining a payload size of a second DCI format by appending padding bits to the second DCI format until the payload size of the second DCI format is not an ambiguous size and is not equal to the payload size of the first DCI format. | 05-06-2010 |
20100173660 | COORDINATED MULTIPOINT (CoMP) JOINT TRANSMISSION USING CHANNEL INFORMATION FEEDBACK AND HIGHER RANK DEDICATED BEAM-FORMING - A subscriber station is provided. The subscriber station comprises a receiver configured to listen for downlink control information for coordinated multipoint (CoMP) joint transmission only from an anchor cell, and to receive the downlink control information for CoMP joint transmission from the anchor cell. | 07-08-2010 |
20100195624 | SYSTEM AND METHOD FOR UPLINK DATA AND CONTROL SIGNAL TRANSMISSION IN MIMO WIRELESS SYSTEMS - A mobile station includes a transmission chain capable of communicating via an uplink transmission to at least one base station in a Multiple Input Multiple Output wireless network. The mobile station includes a plurality of transmit antenna and a transmitter coupled to the plurality of transmit antenna. The transmitter includes a layer mapper that maps data and uplink control information to at least one layer. The mapping is performed prior to Discrete Fourier Transform precoding such that the data and uplink control information are multiplexed and interleaved. The transmitter is configured to simultaneously transmit the data and uplink control information on at least one of a plurality of transmission layers. | 08-05-2010 |
20100195748 | METHOD AND SYSTEM FOR REFERENCE SIGNAL PATTERN DESIGN IN RESOURCE BLOCKS - A base station is provided. The base station comprises a downlink transmit path comprising circuitry configured to transmit a plurality of reference signals in two or more resource blocks. Each resource block comprises S OFDM symbols. Each of the S OFDM symbols comprises N subcarriers, and each subcarrier of each OFDM symbol comprises a resource element. The base station further comprises a reference signal allocator configured to allocate the plurality of reference signals to selected resource elements of the two or more resource blocks according to a reference signal pattern. A same pre-coding matrix is applied across the two or more resource blocks. | 08-05-2010 |
20100232285 | METHOD AND APPARATUS FOR ALLOCATING BACKHAUL TRANSMISSION RESOURCE IN WIRELESS COMMUNICATION SYSTEM BASED ON RELAY - In a relay based wireless communication system, a method for transmitting an uplink backhaul of a relay node includes obtaining scheduling information for an uplink backhaul sub-frame through a downlink backhaul control channel from a base station, and performing a rate matching and mapping of data by regarding at least one predefined symbol as a blank symbol. The predefined symbol is located at a front part or a rear part of the scheduled uplink backhaul sub-frame. The transmitting method further includes performing a multiplexing of the uplink backhaul sub-frame, and transmitting the multiplexed uplink backhaul sub-frame. This method can eliminate an overlap of transmission and reception timing in a relay node due to an RF transmission/reception switching time delay. Also, the method can make better use of wireless backhaul resources and minimize an influence on conventional systems by offering the compatibility with conventional uplink and downlink sub-frame structures. | 09-16-2010 |
20100281323 | CONTROL AND DATA CHANNELS FOR ADVANCED RELAY OPERATION - A relay station in a wireless communication system is configured to relay communications between the base station and a plurality of subscriber stations. The relay station includes at least one antenna configured to transmit and receive data and control information. The relay station also includes a controller coupled to the antenna. The controller is configured to transmit control information to a subscriber station during a first set of symbols in a relay station to subscriber station (RS-to-SS) subframe. The controller also switches the antenna to a receive mode; and receives control information during a second set of symbols in the RS-to-SS subframe. | 11-04-2010 |
20100323709 | METHOD AND SYSTEM FOR INDICATING METHOD USED TO SCRAMBLE DEDICATED REFERENCE SIGNALS - A base station includes a transmit path circuitry to scramble CRC bits of a DCI format using a C-RNTI for dynamic scheduling, and scramble the CRC bits of the DCI format using an SPS C-RNTI for semi-persistent scheduling. If C-RNTI is used, the circuitry generates a downlink transmission grant using the DCI format being a fallback format to indicate a transmit diversity transmission scheme or a single-layer beamforming scheme, and uses the DCI format being a dual-layer beamforming format to indicate a dual-DRS port transmission scheme or a single-DRS port transmission scheme. | 12-23-2010 |
20100323744 | METHOD AND APPARATUS FOR CONTROLLING UPLINK TRANSMISSION POWER IN WIRELESS COMMUNICATION SYSTEM - A method and system are provided for controlling uplink transmission power in a wireless communication system. At least one of a plurality of downlink carriers and a plurality of uplink carriers are aggregated, and the plurality of downlink carriers and the plurality of uplink carriers are mapped between a User Equipment (UE) and a network in the wireless communication system. A message relating to uplink carrier transmission power is received at the UE from the network via a downlink carrier. Uplink transmission power of one or more uplink carriers is controlled in accordance with the message and aggregation and mapping of at least one of the downlink carrier and the one or more uplink carriers. | 12-23-2010 |
20110019755 | DATA TRANSMISSION METHOD AND APPARATUS BASED ON JOINT SPACE DIVISION MULTIPLE ACCESS TECHNOLOGY IN COLLABORATIVE DOWNLINK MIMO SYSTEM - A channel condition information feedback method and apparatus are provided for a collaborative wireless communication network using a multiple input multiple output antenna system. The apparatus includes a downlink channel estimator that estimates channels of adjacent base stations, groups base stations from among the adjacent base stations that are capable of collaborative communication, and obtains a maximum singular vector to base stations belonged to a same group; and a vector selector which selects a weight io vector most accurately representing the maximum singular vector and a complex variable most accurately representing the maximum singular vector in combination with the weight vector. | 01-27-2011 |
20110032884 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING AN UPLINK ACKNOWLEDGEMENT CHANNEL FOR A DOWNLINK DATA CHANNEL IN A MOBILE COMMUNICATION SYSTEM USING ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS - A communication apparatus and method of a mobile communication system using Orthogonal Frequency-Division Multiple Access (OFDMA). A method of transmitting an uplink acknowledge channel (ACKCH) for a downlink data channel in a mobile communication system using OFDMA includes: determining channel resources for each Control Channel Element (CCE), when a downlink control channel including at least two CCEs is received; generating uplink acknowledgement information by analyzing a received downlink data channel; assigning the at least two CCEs to at least two transmission antennas, respectively; and transmitting the uplink ACKCH including the uplink acknowledgement information through the transmission antennas. | 02-10-2011 |
20110038303 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING CONTROL CHANNEL - A method and apparatus for transmitting/receiving control channels through a wireless backhaul in an OFDM-based communication system including relay nodes is provided. A method for transmitting a control channel includes arranging control resources for at least one receiver; sorting the control resources and null resources in a control channel region; rearranging the control resources to be distributed and the null resources to be adjacent to the distributed control resources; and mapping the control resources and null resources to the control channel region. | 02-17-2011 |
20110044250 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING A REFERENCE SIGNAL IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting/receiving reference signals in Long Term Evolution (LTE) and LTE-Advanced (LTE-A) systems includes determining whether a dedicated reference signal is detected in a current subframe; estimating, if a dedicated reference signal is detected in the current subframe, a data channel using the dedicated reference signal to receive data; and estimating, if no dedicated reference signal is detected in the current subframe, a data channel using a common reference signal detected in the current subframe to receive data. The transmission scheme uses a DeModulation Reference Signal (DM-RS) for channel response estimation. To secure backward compatibility of the LTE-A system, a Common Reference Signal is transmitted in normal subframes. | 02-24-2011 |
20110044391 | METHOD AND APPARATUS FOR CONFIGURING CONTROL CHANNEL IN OFDM SYSTEM - A control channel configuration method and apparatus is provided for supporting Inter-Cell Interference Coordination (ICIC) in an OFDM-based communication system. The control channel configuration method includes determining a Resource Block (RB) to be used for configuring control channels; configuring the control channels by mapping the control channels in a data channel region within the RB; and transmitting the configured control channels, wherein configuring the control channels includes mapping the control channels in units of Resource Element Groups (REGs) formed by binding one or more Resource Elements (REs) in a time domain-preferred allocation manner within the same RB. | 02-24-2011 |
20110051749 | METHOD OF REFERENCE SIGNAL ALLOCATION IN WIRELESS COMMUNICATION SYSTEMS - A method is provided for determining reference signal positions in a frequency-time domain in an Orthogonal Frequency Division Multiple Access (OFDMA) system. A plurality of sub-carriers are selected in one resource block according to a predetermined mother pattern for reference signal allocation. When a single resource block is assigned for transmission to a user, the reference signal positions are determined corresponding to the plurality of selected sub-carriers in the single resource block. When multiple resource blocks are assigned for transmission to a user, the reference signal positions are determined in the multiple resource blocks by reducing a number of the plurality of selected sub-carriers in the mother pattern for at least one of the multiple resource blocks. | 03-03-2011 |
20110081935 | LTE-A SYSTEM AND UPLINK POWER CONTROL METHOD THEREOF - An LTE-A system and power control method for controlling cell interference based on codeword-specific transmission power adjustment with a transmission power control offset parameter. The method includes transmitting a parameter K | 04-07-2011 |
20110085506 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING MULTI-USER CONTROL CHANNELS IN A WIRELESS COMMUNICATION SYSTEM WITH MULTIPLE ANTENNAS - Provided are a method and apparatus for transmitting and receiving multi-user control channels through a data channel region in a wireless communication system using multiple antennas. Further provided is a definition of a new search space for control channel candidates. In the transmitting method, a base station forms control channels for a plurality of user equipment each of which is composed of at least one resource block, performs a mapping for the control channels by dividing a space of the same transmission region in a data channel region of a sub-frame, and then multiplexes the control channels with data channels in the data channel region of the sub-frame and to transmit the multiplexed control channels. | 04-14-2011 |
20110090858 | METHOD AND APPARATUS FOR ALLOCATING COMMUNICATION RESOURCES USING VIRTUAL CIRCUIT SWITCHING IN A WIRELESS COMMUNICATION SYSTEM AND METHOD FOR TRANSMITTING AND RECEIVING DATA IN A MOBILE STATION USING THE SAME - A method and apparatus using Virtual Circuit Switching (VCS) in a new scheme are provided for allocating and employing resources by combining Circuit Switching (CS) and Packet Switching (PS), in which a base station allocates resources of a dedicated channel using the CS to a user and then transmits data on the dedicated channel. When data is not transmitted to the user, the base station allocates the allocated dedicated channel resources for resources of a shared channel and transmits data of a different user. Therefore, system capacity can be increased and a waste of communication resources can be minimized in a wireless communication system for frequently transmitting a small amount of traffic that is sensitive to a delay time. | 04-21-2011 |
20110159907 | METHOD AND APPARATUS FOR SENDING AND RECEIVING CHANNEL STATE INFORMATION IN MULTIPLE-INPUT MULTIPLE-OUTPUT NETWORK WIRELESS COMMUNICATION SYSTEMS - A method and an apparatus for sending and receiving channel state information in network Multiple-Input Multiple-Output (MIMO) wireless communication systems are provided. Hybrid feedback technology is provided to transfer complete Channel State Information (CSI) to a transmitter by efficiently combining limited amounts of long-term channel information and short-term channel information are in a down link MIMO network system. | 06-30-2011 |
20110164585 | METHOD AND APPARATUS FOR ALLOCATING RESOURCE OF MULTIPLE CARRIERS IN OFDMA SYSTEM - A resource allocation method and apparatus for an OFDMA-based mobile communication system that allows allocating resources of multiple carriers is provided. A Physical Downlink Control Channel (PDCCH) transmission method for allocating resources in multiple frequency bands of a mobile communication system based on an Orthogonal Frequency Division Multiple Access (OFDMA) according to the present invention includes generating and transmitting, at a base station, multiple PDCCHs for allocating resources in the multiple frequency bands using Control Channel Element (CCE) indices; and receiving and demodulating, at a user equipment, the multiple PDCCHs transmitted by the base station and locating the resources allocated in the multiple frequency bands using the CCE indices of respective PDCCHs. A Physical Downlink Control Channel (PDCCH) transmission apparatus for allocating resources in multiple frequency bands of a mobile communication system based on an Orthogonal Frequency Division Multiple Access (OFDMA) according to the present invention includes a base station apparatus which generates and transmits multiple PDCCHs for allocating resources in the multiple frequency bands using Control Channel Element (CCE) indices; and a user equipment which receives and demodulates the multiple PDCCHs transmitted by the base station and locates the resources allocated in the multiple frequency bands using the CCE indices of respective PDCCHs. | 07-07-2011 |
20110170435 | METHOD FOR PROCESSING CSI-RS IN WIRELESS COMMUNICATION SYSTEM - A method for processing a Channel State Information Reference Signal (CSI-RS) in a wireless communication system based on a multiple access scheme is provided. The CSI-RS transmission method defines a plurality of CSI-RS patterns, assigns the CSI-RS patterns to individual cells, uses the CSI-RSs alternately per Physical Resource Block (PRB) so as to utilize the transmission powers of all antenna ports for transmitting CSI-RSs, transmits Coordinated Multi Point (CoMP) CSI-RSs and non-CoMP CSI-RSs separately, and mutes specific resources in association with the CSI-RS pattern of adjacent cells. | 07-14-2011 |
20110170631 | METHOD AND APPARATUS FOR MAPPING/DEMAPPING RESOURCE IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus for mapping/demapping a resource efficiently in a wireless communication system are provided. A resource mapping method of a transmitter in a wireless communication system includes precoding pairs of symbols, arranging the pairs of precoded symbols adjacently in a resource block, and transmitting the pairs of precoded symbols in the resource block. | 07-14-2011 |
20110177807 | DOWNLINK CHANNEL TRANSMISSION METHOD AND APPARATUS AND COMMON CHANNEL RECEPTION METHOD AND APPARATUS IN CELLULAR COMMUNICATION SYSTEM SUPPORTING BANDWIDTH SCALABILITY - Methods and apparatuses for transmitting and receiving downlink common channels such as synchronization channel and broadcast channel in a cellular communication system supporting bandwidth scalability are provided. The downlink physical data channel transmission method for a base station of a cellular communication supporting bandwidth scalability according to the present invention includes generating a first system information specific to Long Term Evolution (LTE) terminals; generating a second system information specific to LTE-Advanced (LTE-A) terminals, the second system information including information on entire system bandwidth, a number of subbands constituting the entire bandwidth, and subbands on which common control channels are transmitted; transmitting the first information and the second information on a system information channel; and instructing, when a terminal attempts to camp on, a subband on which the terminal to camp. | 07-21-2011 |
20110194536 | METHOD FOR INDICATING A DM-RS ANTENNA PORT IN A WIRELESS COMMUNICATION SYSTEM - A control information interpretation method for use in a mobile communication system including a terminal and a base station, wherein the terminal receives, from the base station, control information including transport block information and DeModulation Reference Signal (DM-RS) antenna port allocation indication information, checks a number of the transport blocks allocated to the terminal based on the transport block information, and interpreting the DM-RS antenna port allocation indication information according to the number of transport blocks. | 08-11-2011 |
20110194631 | UNIFIED FEEDBACK FRAME FOR SUPPORTING A PLURALITY OF FEEDBACK MODES AND A MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) COMMUNICATION SYSTEM USING THE UNIFIED FEEDBACK FRAME - Provided is a multiple-input multiple-output (MIMO) communication system that may provide a plurality of feedback modes. A receiver may feed back, to a transmitter, a base codeword indicator indicating one of base codewords included in the base codebook, a differential codeword indicator indicating one of differential codewords included in the differential codebook, and/or a correlation codeword indicator indicating one of correlation codewords included in the correlation codebook. The transmitter may generate a precoding matrix using at least one of the base codeword indicator, the differential codeword indicator, and the correlation codeword indicator. | 08-11-2011 |
20110194632 | MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION METHOD AND SYSTEM EXCHANGING COORDINATED RANK INFORMATION FOR NEIGHBOR CELL - Provided is a multiple input multiple output (MIMO) communication method and system that may exchange information associated with a coordinated rank for a neighbor cell. In a MIMO communication system, a target terminal may feed back the information associated with the coordinated rank to a serving base station, and the serving base station may exchange the information associated with the coordinated rank with the neighbor base station. The serving base station may perform precoding based on the exchanged information associated with the coordinated rank. | 08-11-2011 |
20110205988 | METHOD AND SYSTEM FOR INDICATING AN ENABLED TRANSPORT BLOCK - A base station is provided. The base station includes transmit path circuitry that generates an uplink grant using an uplink multiple-input multiple-output (MIMO) downlink control information (DCI) format. The uplink MIMO DCI format includes a modulation and coding scheme (MSC) field having an MCS value for each of two transport blocks. The transmit path circuitry transmits the uplink grant to a subscriber station. For a given transport block, a combination of the MCS value corresponding to the transport block and a number positive integer of physical resource blocks allocated to the subscriber station (N_PRB) indicates whether the transport block is disabled. | 08-25-2011 |
20110211487 | COOPERATIVE BEAMFORMING APPARATUS AND METHOD IN WIRELESS COMMUNICATION SYSTEM - A cooperative beamforming apparatus and method in a wireless communication system supporting channel sensitive scheduling based on feedback information is provided. A beamforming method in a wireless communication system according to the present invention includes transmitting, at a mobile station, a channel condition information of a channel of a serving base station to the serving base station and a channel condition information of a channel of a neighbor base station; and forming, at the serving base station, a beam based on the channel condition information to transmit a signal and, at neighbor base station, a beam to transmit a signal. | 09-01-2011 |
20110235540 | TRANSMISSION/RECEPTION APPARATUS AND METHOD FOR SUPPORTING MIMO TECHNOLOGY IN A FORWARD LINK OF A HIGH RATE PACKET DATA SYSTEM - Methods and apparatus are provided for transmitting and receiving data in a communication system with a plurality of antennas. Data and a first pilot are generated. The first pilot is transmitted at a first position in a frequency domain that corresponds to a position of the generated data in the frequency domain and at a first position in a time domain that is with the generated data, in every transmission time interval of the data. A second pilot is generated. The second pilot is transmitted at predetermined second positions in the time domain and the frequency domain, in a transmission time interval that is predefined by a transmitter and a receiver. | 09-29-2011 |
20110235586 | METHOD AND APPARATUS FOR CONTROLLING RETRANSMISSION ON UPLINK IN A WIRELESS COMMUNICATION SYSTEM SUPPORTING MIMO - A method is provided for controlling retransmission by a User Equipment (UE) in a wireless communication system supporting Multiple Input Multiple Output (MIMO) technology. A plurality of transport blocks is initially transmitted to a Node B. A retransmission request for at least one transport block among the plurality of transport blocks is received from the Node B. A precoding matrix for retransmission of the at least one transport block is determined based on the retransmission request for the at least one transport block. The at least one transport block is retransmitted using the determined precoding matrix. | 09-29-2011 |
20110235626 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CONTROL INFORMATION IN MULTI-ANTENNA SYSTEM - A method and apparatus for transmitting control information by an enhanced Node B (eNB) in a wireless communication system supporting Multiple-Input Multiple-Output (MIMO) technology is provided, in which at least one parameter required for initial transmission of User Equipment (UE) is transmitted through a Packet Data Control Channel (PDCCH), at least two codewords are received from the UE and then decoded, one of a plurality of indicators, related to an operation of the UE, is determined based on decoding results of at least two codewords, the determined indicator is transmitted through a Physical Hybrid ARQ indicator channel (PHICH), and at least one codeword is received that the UE generates and transmits based on the parameter required for initial transmission of the UE and the indicator related to the operation of the UE. | 09-29-2011 |
20110237283 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK CONTROL INFORMATION FOR RESOURCE ALLOCATION IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting and receiving Downlink Control Information (DCI) in a wireless communication system. A method for transmitting DCI by a base station includes generating DCI including at least one of a data resource allocation indicator, a data format indicator for at least one Transport Block (TB), and a DeModulation Reference Signal (DMRS) resource allocation indicator corresponding to the at least one TB; and sending the DCI to a terminal. The DMRS resource allocation indicator includes a rank pattern for the at least one TB, an allocated scrambling code type, and DMRS port information. | 09-29-2011 |
20110243008 | COMPONENT CARRIER ACTIVATION METHOD AND APPARATUS IN A CELLULAR COMMUNICATION SYSTEM - A method and apparatus for activating a deactivated Component Carrier in a cellular communication system supporting carrier aggregation. The method includes receiving, from a Base Station (BS), UpLink (UL) scheduling information for a UL CC in a deactivated state; determining whether a DownLink (DL) CC associated with the UL CC is activated; and activating the DL CC, when the DL CC is not activated. | 10-06-2011 |
20110249582 | CHANNEL STATE INFORMATION REQUEST/FEEDBACK METHOD AND APPARATUS - A Channel State Information (CSI) request/feedback method and apparatus for a wireless communication system supporting carrier aggregation or bandwidth extension are provided. A base station sets a CSI request field of an Uplink (UL) grant for scheduling UL transmission on a UL Component Carrier (CC) corresponding to a Downlink (DL) CC of which CSI is requested, to a request value. The UL grant is transmitted to a terminal. | 10-13-2011 |
20110249633 | METHOD OF TRANSMITTING AND RECEIVING CONTROL INFORMATION BASED ON SPATIAL-MULTIPLEXING GAIN - A control information transmission and reception method based on a spatial-multiplexing gain, are provided. The control information may be transmitted by obtaining the spatial-multiplexing gain using an E-PDCCH region, and thus, a transmission efficiency of the control information may be improved. The common control information used for decoding the E-PDCCH may be transmitted via a PDCCH, and thus, a base station supporting both a general terminal and an enhanced terminal may effectively transmit the control information. Information associated with an indicator indicating whether the E-PDCCH is to be used during a subsequent resource allocation period may be transmitted, and thus, whether decoding with respect to the E-PDCCH is to be performed during the subsequent allocation period may be determined. | 10-13-2011 |
20110268062 | RESOURCE MAPPING METHOD AND APPARATUS OF OFDM SYSTEM - A method and apparatus for allocating resource between uplink ACK/NACK channel and downlink control channel supporting spatial multiplexing in an OFDM-based wireless communication system which configures uplink ACK/NAK channel implicitly using reference signals for discriminating among resource allocation spaces and physical channel resource. The method is capable of multiplexing the uplink ACK/NACK channel associated with the control channel extended by spatial multiplexing into the uplink ACK/NACK channel resource which does not support spatial multiplexing. | 11-03-2011 |
20110268075 | METHOD AND APPARATUS FOR TRANSMITTING UPLINK CONTROL INFORMATION IN MULTI-CARRIER WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting uplink control information on the data channel in a multi-carrier wireless communication system is provided. An Uplink Control Information (UCI) transmission method in a wireless communication system supporting multicarrier transmission according to the present invention includes channel-coding a UCI with reference to a number of UCI bits available; dividing the channel coded UCI bits into a number of Physical Uplink Shared Channels (PUSCHs); and transmitting the UCI multiplexed with data on the individual PUSCHs. | 11-03-2011 |
20110268204 | MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM OF SUPPORTING SEVERAL REPORTING MODES - A plurality of reporting modes used to report feedback information is provided. A transmitter and a receiver generate and share feedback information based on a corresponding reporting mode. | 11-03-2011 |
20110280222 | UPLINK TRANSMISSION APPARATUS AND METHOD FOR MOBILE COMMUNICATION SYSTEM SUPPORTING UPLINK MIMO - A base station includes a transmit path circuitry to transmit an uplink grant to a subscriber station. The uplink grant indicating a first MCS value for a first codeword transmission and a second MCS value for a second codeword transmission. The base station also includes a receive path circuitry configured to receive a MIMO uplink subframe from the subscriber station, the MIMO uplink subframe having a first subset of layers used for the first codeword transmission and a second subset of layers used for the second codeword transmission. ACK/NACK information and RI information are repeated on both the first and second subsets of layers, and CQI is spatially multiplexed on either the first subset or the second subset of layers. If the first MCS value is different from the second MCS value, the CQI is spatially multiplexed onto the subset of layers having a higher MCS value. | 11-17-2011 |
20110292812 | METHOD AND APPARATUS FOR RADIO LINK CONTROL IN CELLULAR RADIO COMMUNICATION SYSTEM SUPPORTING CARRIER AGGREGATION - The present invention relates to a method and apparatus for determining radio link failure between the UE and the eNB in a wireless communication system. Particularly, the present invention provides a method and apparatus for determining radio link failure efficiently in such a way that the UE measures the radio link quality of the anchor carrier, the radio link qualities of the aggregated carriers, and the radio link quality of neighbor cells in order, and determines whether the radio link quality fulfills a predetermined condition. | 12-01-2011 |
20110299484 | METHOD AND SYSTEM FOR TRANSMITTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEMS - A base station includes a transmit path circuitry to transmit an uplink grant in a DCI format to a subscriber station. The base station also includes a receive path circuitry to receive only UCI on a PUSCH from a subscriber station when the uplink grant includes a MCS of an enabled transport block (TB) with a value of 29, or a redundancy version of the PUSCH with a value of 1; a CSI request field with a non-zero value; and a total number of physical resource blocks allocated for the subscriber station, N | 12-08-2011 |
20110300854 | METHOD OF CONTROL INDICATION IN MULTI-INPUT MULTI-OUTPUT COMMUNICATION SYSTEMS - Multiple Transport Blocks (TBs) or data streams are provided in Multi-Input-Multi-Output (MIMO) wireless communication systems herein. The base station (eNB) controls and schedules all downlink and uplink transmission to and from User Equipments, which need to receive an uplink grant from BS/eNB before they transmit. The uplink grant is carried as one of the control indication message in the downlink. The BS/eNB also transmits ACK/NACK information in the HARQ indication channel to the UE for each of the transport blocks. The UE detects the control indication to determine the actual uplink scheduling, as well as the HARQ indication. A method of transmitting a control indication message, which contains a detailed transmit format for one of the TBs to be transmitted, while allowing simultaneous communications on the other TBs is also enclosed. | 12-08-2011 |
20110305295 | METHOD AND APPARATUS FOR TRANSMITTING CSI-RS AND DATA USING PARTIAL MUTING OF CSI-RS - A method and apparatus for transmitting Channel State Information Reference Symbol (CSI-RS) and data with partial muting of the CSI-RS are proposed. The method includes determining a CSI-RS pattern to be used among CSI-RS pattern candidates, determining a muting pattern for muting some resource elements constituting CSI-RS pattern candidates except for the determined CSI-RS pattern, mapping data symbols and CSI-RS to resource elements in a resource grid with rate patching in consideration of the CSI-RS pattern and muting pattern, and transmitting the data symbols and CSI-RS to a terminal. | 12-15-2011 |
20110310829 | METHOD AND APPARATUS FOR GROUPING CONTROL CHANNEL RESOURCE IN MOBILE COMMUNICATION SYSTEM - A method for grouping a control channel resource in an Orthogonal Frequency Division Multiplexing based mobile communication system for adjusting inter-cell interference and an apparatus performing the same are disclosed. Inter-cell inference used between cells or base stations is controlled or distributed to secure reception of a control channel in a heterogeneous system, and interference may be efficiently controlled through coordination of resource groups by cells. The method and apparatus are equally applicable when resources of backhaul transmission channel of a relay cell in a cell are grouped. | 12-22-2011 |
20110310987 | UPLINK POWER CONTROL METHOD FOR MOBILE COMMUNICATION SYSTEM - A per-layer and per-antenna uplink power control method for MIMO transmission of PUSCH in a Long Term Evolution-Advanced (LTE-A) system is provided. A transmit power for a plurality of transmit antennas is calculated based on a power control parameter received in a downlink. Uplink data is transmitted through the plurality of transmit antennas by applying the transmit power to each of a plurality of codewords. | 12-22-2011 |
20110317582 | MULTI-CELL TRANSMISSION DIVERSITY METHOD AND APPARATUS - A multi-cell transmission diversity method and apparatus that is capable of forming two virtual antennas of each cell and producing orthogonality of the virtual antennas using an improved precoding technique in an OFDM-based cellular mobile communication system is provided for improving transmission diversity gain with coherent combination of the orthogonal signals at the receiver. A multi-cell transmission diversity transmission method of a transmitter according to the present invention includes generating a first signal stream and a second signal stream by performing transmission diversity encoding on a user data; multiplexing and precoding the first signal stream and a first dedicated reference signal into a first diversity signal; multiplexing and precoding the second signal stream and a second dedicated reference signal a second diversity signal; and transmitting the first and second diversity signals simultaneously, wherein the first dedicated reference signal and the second dedicated reference signal are user-specific reference signal signals. | 12-29-2011 |
20110319068 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING CSI IN CELLULAR COMMUNICATION SYSTEM SUPPORTING CARRIER AGGREGATION - A Channel Status Information (CSI) transmission method and apparatus of a terminal are provided for use in a wireless communication system. In the wireless communication system supporting carrier aggregation, the terminal transmits the CSIs of component carriers without conflict of their transmission time points, resulting in an improvement of system performance. In a case where the transmission time points are determined to overlap unavoidably, the terminal transmits the CSI as compressed. | 12-29-2011 |
20120028668 | METHOD AND APPARATUS FOR SENDING AND RECEIVING CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM - In a wireless communication system a control channel is required in order to use limited resources effectively. However, the control channel resource is part of the system overhead, and thus reduces the data channel resource used for data transmission. In the long term evolution (LTE) system based on OFDM, one sub frame the consists of fourteen OFDM symbols wherein a maximum of three OFDM symbols are used for the control channel resource and remaining eleven OFDM symbols are used for the data channel resource. Therefore, the quantity of energy that can be transmitted for the control channel resource is extremely limited compared to the data channel resource. For this reason, the coverage of the control channel becomes less than that &; of the data channel, and even if a user can successfully receive the data channel, reception failure of a control channel sometimes˜results in failure of data recovery. In the present invention, in order to expand the coverage of the control channel to at least the coverage of the data channel, the time resource of the transmission resource wherein the control channel is transmitted is expanded and allocated for sending and receiving the control channel. By way of methods for extending the time resource are provided a method wherein a plurality of sub frames are used to transmit one control channel, and a method wherein a part of a data channel is used for the control channel. | 02-02-2012 |
20120039282 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM - Methods and apparatus are provided for transmitting processing reference signals in a mobile communication system. A base station determines a reference signal pattern comprising at least one resource element, generates a bitmap indicator indicating whether zero transmission power is assigned to the at least one resource element of the reference signal pattern, and transmits the reference signal pattern and the bitmap indicator to a terminal. The terminal receives the reference signal pattern and the bitmap indicator, and processes a reference signal extracted according to the reference signal pattern and the bitmap indicator. | 02-16-2012 |
20120063405 | METHOD FOR ALLOCATING RESOURCE IN LTE SYSTEM - The present invention relates to a fractional RB (Resource Block) allocation method which enables resource allocation in a unit smaller than RB to improve the capacity of VoIP (Voice over Internet Protocol) in an LTE (Long Term Evolution) system. That is, the present invention introduces a resource arrangement method which allows different users to share the same resource, without even using an SDMA, and a method for informing the fractional RB allocation and how to use the same. A method for introducing multiplexation into an RB and changing the RE arrangement is proposed to support the downlink fractional RB allocation. A method for changing the RE arrangement is also proposed to support the uplink fractional RB allocation. According to the present invention, to provide a consistent service with a small amount of traffic generated as in the VoIP, resources of a smaller amount than a single RB can be used for a terminal with a good channel state. In the present invention, the occupancy of resources for the terminals of an excellent channel state is reduced so that the capacity of the VoIP can be improved. | 03-15-2012 |
20120076038 | INFORMATION FEEDBACK METHOD FOR COORDINATED MULTIPOINT COMMUNICATION - Coordinated multipoint communication is a technology for improving cell-edge performance for users in a cell-type mobile communication system. In order to enable a coordinated multipoint transmission/reception operation, a user equipment report of a local environment is required to select both coordinated communication modes and communication partners in evolved Node B (eNB) base stations. According to the present invention, a method is described for feeding back information from User Equipment (UE) to a serving base station to enable a coordinated multi-point transmission/reception operation. The information reported through the feedback is classified into two categories corresponding to received signal intensity information and received signal timing information. The UE may select one or both types of information from between the categories to provide feedback. In embodiments of the present invention, various overhead-reducing reporting formats are described. | 03-29-2012 |
20120076078 | TRANSMISSION/RECEPTION METHOD AND APPARATUS FOR UPLINK MIMO RETRANSMISSION IN LTE SYSTEM - A transmission/reception method and apparatus for a mobile communication system supporting uplink MIMO is provided. In the transmission method, a User Equipment (UE) transmits two transport blocks according to a predetermined number of layers and respective precoding indices, an evolve Node B (eNB) transmits, when one of the transport blocks is lost, a negative acknowledgement for the lost transport block, and the UE sets a precoding index for the lost transport block to a predetermined value to retransmit the lost transport block while maintaining the number of layers. | 03-29-2012 |
20120082116 | APPARATUS AND METHOD FOR FEEDING BACK CHANNEL QUALITY INFORMATION AND SCHEDULING APPARATUS AND METHOD USING THE SAME IN A WIRELESS COMMUNICATION SYSTEM - An apparatus and method are provided for feeding back channel quality information and performing scheduling using the fed-back channel quality information in a wireless communication system based on Orthogonal Frequency Division Multiple Access (OFDMA). In the OFDMA wireless communication system, forward performance degradation due to a decrease in an amount of reverse channel quality information is reduced, and also an increase in the reverse load due to channel quality information feedback is suppressed. A base station controls power of a physical channel using information fed back from a mobile station. In a method for feeding back channel quality information from the mobile station, sub-band-by-sub-band channel quality information is measured and channel-by-channel quality information of a number of channels is transmitted in order of sub-bands of better channel quality information. Average channel quality information for a total band is measured and transmitted. | 04-05-2012 |
20120082248 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CODEBOOK SUBSET RESTRICTION BITMAP - A method for transmitting and receiving a codebook subset restriction bitmap is provided. The Codebook Subset Restriction (CSR) bitmap transmission method of an evolved Node B (eNB) in transmission mode 9 for communication with 8 antenna ports includes generating a CSR bitmap including bits corresponding to restricted precoding matrix indicators and rank indicators that are not allowed for reporting and transmitting the CSR bitmap to a User Equipment (UE). The CSR bitmap comprises 53 bits corresponding to a first codebook and 56 bits corresponding to a second codebook, the 53 bits corresponding to a first codebook comprise 16, 16, 4, 4, 4, 4, and 1 bits for layers 1, 2, 3, 4, 5, 6, 7, and 8, respectively, and the 56 bits corresponding to a second codebook comprise 16, 16, 16 and 8 bits for layers 1, 2, 3, and 4, respectively. | 04-05-2012 |
20120087321 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA - A transmission scheme newly adds a Demodulation Reference Signal (DM-RS) to estimate a channel response for demodulation. When a transmission scheme based on Long Term Evolution Common Reference Signal (LTE CRS) is set in a user, a corresponding user cannot receive data in a Multimedia Broadcast Multicast Service Single Frequency Network (MBSFN) sub-frame. To solve this problem, the present scheme separates and sets a transmission mode for sub-frame and a transmission mode for MBSFN. | 04-12-2012 |
20120088514 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING FEEDBACK INFORMATION FOR INTER-CELL COOPERATIVE TRANSMISSION IN WIRELESS COMMUNICATION CELLULAR SYSTEM - A method for transmitting feedback information for cooperative transmission in a wireless communication cellular system comprises: receiving information on cells that can be cooperatively transmitted from a base station; determining cells that prefer the cooperative transmission among the cells that can be cooperatively transmitted; generating feedback information, which includes a preference cell indicator representing preferred cells and non-preferred cells for the cooperative transmission among the cells that can be cooperatively transmitted, precoding matrix information for the respective cell that can be cooperatively transmitted, phase information representing a phase correction value of each of the preferred cells for the cooperative transmission, and a channel quality indicator; and transmitting the feedback information through a control channel or a data channel. Accordingly, the present invention provides a method and apparatus for transmitting and receiving a report of implicative feedback information on code books that can be designed for the gain improvement of a high-level inter-cell cooperative transmission. | 04-12-2012 |
20120122515 | METHOD AND APPARATUS FOR COMMUNICATING WITH BASE STATION BASED ON SPEED OF USER EQUIPMENT IN MOBILE COMMUNICATION SYSTEM - Provided is a method for performing communication with a network by a User Equipment (UE) based on its speed information in the network in which at least one portion includes at least one micro cell overlapping at least one macro cell. The method includes measuring, by the UE, its moving speed; and performing at least one of feedback, measurement report, random access and UE capability report to the network by considering the measurement result. | 05-17-2012 |
20120127878 | ANTENNA ALLOCATION APPARATUS AND METHOD FOR CELLULAR MOBILE COMMUNICATION SYSTEM - A method and apparatus for selecting and allocating antennas efficiently are provided. The method includes transmitting, to a User Equipment (UE), information indicating a configuration of a plurality of Channel Status Information Reference Signals (CSI-RSs) through UE specific signaling during an initial access attempt with the UE; receiving, from the UE, CSI-RS measurement results indicating configured CSI-RSs; transmitting CSI-RSs corresponding to a set of available distributed ports (D-ports) based on received signal strength information included in results of the CSI-RS measurement; and determining a CSI-RS of a selected D-port set for use in communications based on feedback information received from the UE. | 05-24-2012 |
20120128095 | APPARATUS AND METHOD FOR MAPPING SYMBOLS TO RESOURCES IN A MOBILE COMMUNICATION SYSTEM - A method for transmitting data information and control information by a transmitter in a communication system is provided. The method includes identifying an amount of resources to be used for control channel transmission within a predetermined maximum amount of resources available for control channel transmission among total resources of a subframe; mapping control information onto the identified amount of resources to be used for the control channel transmission; mapping data information onto all remaining resources of the subframe, other than the identified resources used for the control channel transmission among the total resources; and transmitting information related to the amount of resources to be used for the control channel transmission, through a predetermined control channel; and transmitting the mapped control information, and the mapped data information. | 05-24-2012 |
20120129566 | UPLINK TRANSMISSION POWER CONTROL METHOD AND APPARATUS FOR A DISTRIBUTED ANTENNA MOBILE COMMUNICATION SYSTEM - An uplink power control method and apparatus of a terminal in a mobile communication system are provided. The method includes receiving, by the terminal, a location parameter corresponding to at least one antenna selected among a plurality of antennas distributed in a service area of a base station, each of the plurality of antennas being connected to the base station; and calculating uplink power based on the location parameter. | 05-24-2012 |
20120140663 | METHOD AND APPARATUS FOR FEEDBACK OF CHANNEL STATE INFORMATION IN A DISTRIBUTED ANTENNA SYSTEM (DAS)- BASED WIRELESS COMMUNICATION SYSTEM - Feedback methods and apparatuses are provided for efficiently feeding back downlink Channel State Information (CSI) using limited information in a DAS-based wireless communication system. A method includes determining, by a receiver, a candidate Antenna Port (AP) set from among a plurality of APs; selecting an active AP set from the candidate AP set; and transmitting the candidate AP set, the active AP set, and the downlink CSI of active APs included in the active AP set | 06-07-2012 |
20120147766 | CHANNEL STATUS INFORMATION FEEDBACK METHOD AND APPARATUS FOR A DISTRIBUTED ANTENNA MOBILE COMMUNICATION SYSTEM - A method and apparatus for transmitting and receiving channel status information in a mobile communication system including a distributed antenna system. The channel status information feedback method of the present invention includes transmitting, to a base station, received signal strengths of reference signals transmitted through at least one of antennas distributed in a service area of the base station and transmitting, to a base station, channel status information corresponding to at least one antenna selected by the base station. | 06-14-2012 |
20120195271 | METHOD AND DEVICE FOR GENERATING REFERENCE SIGNAL IN CELLULAR MOBILE COMMUNICATION SYSTEM - Methods and apparatus are provided for transmitting and receiving reference signals through distributed antennas deployed within a service area of a base station in a mobile communication system. First control information, including at least two scrambling factor combinations, is received at a terminal from the base station. Second control information, indicating one of the at least two scrambling factor combinations, is received at the terminal from the base station. The one of the at least two scrambling factor combinations is selected based on the second control information. An initial value of a demodulation reference signal sequence is calculated using the selected scrambling factor combination. The demodulation reference signal sequence is received using the initial value. | 08-02-2012 |
20120201327 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING THE HYBRID-ARQ ACK/NACK SIGNAL IN MOBILE COMMUNICATION SYSTEM - An apparatus and method are provided for mapping control information to a multiple antenna array to transmit the control information in a mobile communication system. The method includes spreading the control information with an orthogonal sequence according to a spreading factor; and mapping the spread control information to the multiple antenna array based on a repetition index and a Physical Hybrid Automatic Repeat reQuest (HARQ) Indicator CHannel (PHICH) group index. The spread control information is mapped to the multiple antenna array in an alternating pattern in accordance with the repetition index. | 08-09-2012 |
20120207145 | METHOD AND APPARATUS FOR DOWNLINK TRANSMISSION BASED ON MIMO PRECODING IN WIRELESS COMMUNICATION SYSTEM EMPLOYING DISTRIBUTED ANTENNA SYSTEMS - A transmission method and apparatus utilizing Multiple-Input and Multiple-Output (MIMO) precoding based on Distributed Antenna Systems (DASs) are provided. The transmission method includes determining active antenna ports, for a User Equipment (UE) having multiple receive antennas, from among a plurality of Distributed Antenna Ports (DAPs) evenly placed in a service area; assigning a Multiple-Input and Multiple-Output (MIMO) mode to the UE and notifying the UE of the MIMO mode assignment; determining a signal precoding vector on a basis of feedback information for the MIMO mode received from the UE; and precoding a signal using the signal precoding vector and transmitting the precoded signal through the active antenna ports. | 08-16-2012 |
20120213170 | MOBILE COMMUNICATION SYSTEM AND CHANNEL TRANSMISSION/RECEPTION METHOD THEREOF - A method and an apparatus for transmitting Hybrid Automatic Repeat reQuest (HARQ) Acknowledgement/Negative Acknowledgement (ACK/NACK) are provided. The HARQ ACK/NACK transmission method includes receiving a Physical Downlink Shared Channel (PDSCH) in a subframe of a first cell, identifying an ACK subframe for transmitting HARQ ACK/NACK corresponding to the PDSCH, and transmitting the HARQ ACK/NACK in the identified ACK subframe of a second cell. | 08-23-2012 |
20120230285 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CONTROL CHANNELS BY RESTRICTING A SET OF THE CONTROL CHANNELS IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus are provided for transmitting control information in a base station for a wireless communication system. The method includes transmitting, to a terminal, information associated with a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols carrying control channels; determining a set of control channel candidates based on an IDentifier (ID) of the terminal; selecting at least one control channel candidate from among the set of control channel candidates; and transmitting the control information to the terminal through the selected at least one control channel candidate. Each control channel candidate included in the set of control channel candidates consists of one, two, four, or eight control channel elements (CCEs) existing in the OFDM symbols. | 09-13-2012 |
20120236956 | TRANSMISSION METHODS FOR DOWNLINK ACK/NACK CHANNELS - A method from transmitting data via multiple antennas. In this method, four information bits to be transmitted are multiplexed by using either one of a code division multiplexing scheme or a second code division multiplexing scheme combined with a real and imaginary multiplexing scheme, to generate a code division multiplexed symbol including four vectors. Then, the code division multiplexed symbol is repeatedly transmitted by alternatively applying two transmit diversity schemes via four transmission antennas. | 09-20-2012 |
20120243490 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING AN UPLINK ACKNOWLEDGEMENT CHANNEL FOR A DOWNLINK DATA CHANNEL IN A MOBILE COMMUNICATION SYSTEM USING ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS - A communication apparatus and method of a mobile communication system. A method of transmitting an uplink acknowledge channel (ACKCH) for a downlink data channel in a mobile communication system includes: | 09-27-2012 |
20120257554 | METHOD AND APPARATUS FOR DEFINING TRANSCEIVING TIMING OF A PHYSICAL CHANNEL IN A TDD COMMUNICATION SYSTEM WHICH SUPPORTS CROSS-CARRIER SCHEDULING - The present invention relates to a method for defining, in a TDD wireless communication system in which broadband is configured by means of carrier aggregation, transceiving timing for a data channel and a control channel when cross-carrier scheduling is implemented. | 10-11-2012 |
20120263143 | METHOD AND APPARATUS FOR ALLOCATING RESOURCES OF A CONTROL CHANNEL IN A MOBILE COMMUNICATION SYSTEM USING ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING - A method is provided for allocating resources of a control channel in a mobile communication system using Orthogonal Frequency Division Multiplexing (OFDM). The method includes, when a time index and a frequency index of available Resource Elements (REs) are defined as | 10-18-2012 |
20120327891 | METHOD AND SYSTEM FOR INDICATING METHOD USED TO SCRAMBLE DEDICATED REFERENCE SIGNALS - A base station includes a transmit path circuitry to scramble CRC bits of a DCI format using a C-RNTI for dynamic scheduling, and scramble the CRC bits of the DCI format using an SPS C-RNTI for semi-persistent scheduling. If C-RNTI is used, the circuitry generates a downlink transmission grant using the DCI format being a fallback format to indicate a transmit diversity transmission scheme or a single-layer beamforming scheme, and uses the DCI format being a dual-layer beamforming format to indicate a dual-DRS port transmission scheme or a single-DRS port transmission scheme. If SPS C-RNTI is used, the circuitry generates a downlink transmission grant using the DCI format being the fallback format to indicate a single-DRS port transmission scheme, and uses the DCI format being the dual-layer beamforming format to indicate a dual-DRS port transmission scheme or a single-DRS port transmission scheme. | 12-27-2012 |
20130077587 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CONTROL CHANNELS BY RESTRICTING A SET OF THE CONTROL CHANNELS IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus are provided for transmitting control information in a base station for a wireless communication system. The method includes transmitting, to a terminal, information associated with a number of Control Channel Elements (CCEs) included in control channels, determining a set of control channel candidates based on an IDentifier (ID) of the terminal and the information associated with the number of CCEs; selecting at least one control channel candidate from among the set of control channel candidates; and transmitting the control information to the terminal through the selected at least one control channel candidate. | 03-28-2013 |
20130077711 | TRANSMISSION/RECEPTION APPARATUS AND METHOD FOR SUPPORTING MIMO TECHNOLOGY IN A FORWARD LINK OF A HIGH RATE PACKET DATA SYSTEM - Methods and apparatus are provided for transmitting and receiving data in a communication system with a plurality of antennas. Data and a first pilot are generated. The first pilot is transmitted at a first position in a frequency domain that corresponds to a position of the generated data in the frequency domain and at a first position in a time domain that is with the generated data, in every transmission time interval of the data. A second pilot is generated. The second pilot is transmitted at predetermined second positions in the time domain and the frequency domain, in a transmission time interval that is predefined by a transmitter and a receiver. | 03-28-2013 |
20130083764 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING THE HYBRID-ARQ ACK/NACK SIGNAL IN MOBILE COMMUNICATION SYSTEM - An apparatus and method are provided for transmitting a symbol group in a mobile communication system. The method includes generating a symbol group to which an orthogonal sequence is applied; mapping the generated symbol group to an Orthogonal Frequency Division Multiple (OFDM) symbol based on a symbol group index and a Physical HARQ Indicator Channel (PHICH) group index; and transmitting the mapped symbol group. The generated symbol group is mapped to the OFDM symbol in an alternating pattern in accordance with the symbol group index. | 04-04-2013 |
20130107822 | SEARCH PROCESS FOR PHYSICAL DOWNLINK CONTROL CHANNELS IN A COMMUNICATION SYSTEM | 05-02-2013 |
20130107840 | APPARATUS AND METHOD FOR TRANSMISSION OF SOUNDING REFERENCE SIGNAL IN UPLINK WIRELESS COMMUNICATION SYSTEMS WITH MULTIPLE ANTENNAS AND SOUNDING REFERENCE SIGNAL HOPPING | 05-02-2013 |
20130114545 | TRANSMISSION OF SCHEDULING ASSIGNMENTS IN MULTIPLE OPERATING BANDWIDTHS - Methods and apparatuses are described for the transmission of Scheduling Assignments (SAs) from a base station to User Equipments (UEs) for data reception in the downlink or data transmission in the uplink of a communication system consisting of multiple Component Carriers (CCs). The SAs are separately coded and transmitted using elementary units (Control Channel Elements or CCEs). Locations of CCEs determine whether an SA is intended for a first CC or for a second CC. Further, the location of CCEs for an SA intended for a first CC is used to determine locations of CCEs for an SA intended for a second CC. | 05-09-2013 |
20130142121 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING A REFERENCE SIGNAL IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting/receiving reference signals in Long Term Evolution (LTE) and LTE-Advanced (LTE-A) systems includes determining whether a dedicated reference signal is detected in a current subframe; estimating, if a dedicated reference signal is detected in the current subframe, a data channel using the dedicated reference signal to receive data; and estimating, if no dedicated reference signal is detected in the current subframe, a data channel using a common reference signal detected in the current subframe to receive data. The transmission scheme uses a DeModulation Reference Signal (DM-RS) for channel response estimation. To secure backward compatibility of the LTE-A system, a Common Reference Signal is transmitted in normal subframes. | 06-06-2013 |
20130163499 | METHOD AND APPARATUS FOR REFERENCE SIGNALING ALLOCATION AND CHANNEL ESTIMATION IN DISTRIBUTED ANTENNA SYSTEMS - An apparatus and method for transmitting reference signals in a communication system are provided. The method includes transmitting common reference signals of a first type from a transmitter to a plurality of receivers; transmitting receiver-specific reference signals of a second type from a plurality of distributed ports to a subset of the plurality of receivers; wherein the common reference signals of the first type and the receiver-specific reference signals of the second type are allocated to different resources from one another, and wherein the communication system includes the transmitter and the plurality of receivers and the transmitter uses a plurality of central ports and the plurality of distributed ports to transmit to the plurality of receivers. | 06-27-2013 |
20130171280 | NOVEL USE OF RICE, RICE BRAN OR RICE HULL EXTRACT AS AN HISTAMINE RECEPTOR ANTAGONIST - Disclosed is a novel use of rice, rice bran or rice hull extract as a histamine receptor antagonist. The rice, rice bran or rice hull extract may be used as a natural antihistamine to prevent or treat allergic rhinitis, inflammatory bowel disease, asthma, bronchitis, nausea, gastric and duodenal ulcer, gastroesophageal reflux disease, sleep disorder, anxiety and depression. It provides comparable or better effect of decreasing sleep latency, increasing sleep duration and increasing non-REM sleep as compared to diazepam, which is currently used as sleeping drug. Derived from the natural product rice, rice bran or rice hull, it has no side effect such as cognitive impairment, resistance or dependency even after long-term use. | 07-04-2013 |
20130182596 | METHOD AND APPARATUS FOR SENDING AND RECEIVING CHANNEL STATE INFORMATION IN MULTIPLE-INPUT MULTIPLE-OUTPUT NETWORK WIRELESS COMMUNICATION SYSTEMS - A method and an apparatus for sending and receiving channel state information in network Multiple-Input Multiple-Output (MIMO) wireless communication systems are provided. Hybrid feedback technology is provided to transfer complete Channel State Information (CSI) to a transmitter by efficiently combining limited amounts of long-term channel information and short-term channel information are In a down link MIMO network system. | 07-18-2013 |
20130208687 | APPARATUS AND METHOD FOR PERFORMING RESOURCE ALLOCATION AND COMMUNICATION IN A WIRELESS COMMUNICATION SYSTEM, AND SYSTEM USING SAME - Methods and apparatus are provided for transmitting and receiving uplink data in a wireless communication system. Hopping-related information is received at a mobile station from a base station. Resource allocation information is received at the mobile station from the base station. The uplink data is transmitted from the mobile station to the base station through at least one resource determined based on a sequence for global hopping and a sequence for local hopping, if global hopping and local hopping are enabled | 08-15-2013 |
20130223323 | METHOD AND DEVICE FOR RECEIVING A SUBFRAME IN DIFFERENT FORMS IN A WIRELESS COMMUNICATION SYSTEM - The present invention proposes a method for preventing, when two types of subframes (first subframe and second subframe) exist in a wireless communication system, a high version terminal from performing unnecessary operation for the second subframe. Through the present invention, the high version terminal skips unnecessary operation, resulting in reduction of unnecessary power consumption. | 08-29-2013 |
20130294389 | METHOD OF TRANSMITTING AND RECEIVING CONTROL INFORMATION BASED ON SPATIAL-MULTIPLEXING GAIN - A control information transmission and reception method based on a spatial-multiplexing gain, are provided. The control information may be transmitted by obtaining the spatial-multiplexing gain using an E-PDCCH region, and thus, a transmission efficiency of the control information may be improved. The common control information used for decoding the E-PDCCH may be transmitted via a PDCCH, and thus, a base station supporting both a general terminal and an enhanced terminal may effectively transmit the control information. Information associated with an indicator indicating whether the E-PDCCH is to be used during a subsequent resource allocation period may be transmitted, and thus, whether decoding with respect to the E-PDCCH is to be performed during the subsequent allocation period may be determined | 11-07-2013 |
20130343333 | RESOURCE MAPPING METHOD AND APPARATUS OF OFDM SYSTEM - A method and apparatus for allocating resource between uplink ACK/NACK channel and downlink control channel supporting spatial multiplexing in an OFDM-based wireless communication system which configures uplink ACK/NAK channel implicitly using reference signals for discriminating among resource allocation spaces and physical channel resource. The method is capable of multiplexing the uplink ACK/NACK channel associated with the control channel extended by spatial multiplexing into the uplink ACK/NACK channel resource which does not support spatial multiplexing. | 12-26-2013 |
20140003376 | DOWNLINK CHANNEL TRANSMISSION METHOD AND APPARATUS AND COMMON CHANNEL RECEPTION METHOD AND APPARATUS IN CELLULAR COMMUNICATION SYSTEM SUPPORTING BANDWIDTH SCALABILITY | 01-02-2014 |
20140029687 | METHOD FOR MAPPING AND DEMAPPING RESOURCE IN A WIRELESS COMMUNICATION SYSTEM AND AN APPARATUS THEREOF - A method and apparatus for mapping/demapping a resource efficiently in a wireless communication system are provided. A resource mapping method of a transmitter in a wireless communication system includes precoding pairs of symbols, arranging the pairs of precoded symbols adjacently in a resource block, and transmitting the pairs of precoded symbols in the resource block. | 01-30-2014 |
20140071915 | MULTIPLEXING RESOURCE ELEMENT GROUPS FOR CONTROL CHANNEL ELEMENTS OF CONTROL CHANNELS - Methods and apparatus are described for forming Control Channel Elements (CCEs) from Resource Element Groups (REGs) that are located in one or more Physical Resource Block (PRB) pairs from a set of PRB pairs, for determining a first symbol in a Transmission Time Interval (TTI) for a Physical Downlink Shared Channel (PDSCH), and for determining whether the PDSCH includes all PRB pairs indicated by a respective PDCCH scheduling the PDSCH. | 03-13-2014 |
20140071935 | MULTIPLEXING RESOURCE ELEMENT GROUPS FOR CONTROL CHANNEL ELEMENTS OF CONTROL CHANNELS - Methods and apparatus are described for forming Control Channel Elements (CCEs) from Resource Element Groups (REGs) that are located in one or more Physical Resource Block (PRB) pairs from a set of PRB pairs, for determining a first symbol in a Transmission Time Interval (TTI) for a Physical Downlink Shared Channel (PDSCH), and for determining whether the PDSCH includes all PRB pairs indicated by a respective PDCCH scheduling the PDSCH. | 03-13-2014 |
20140086171 | APPARATUS AND METHOD FOR FEEDING BACK CHANNEL QUALITY INFORMATION AND SCHEDULING APPARATUS AND METHOD USING THE SAME IN A WIRELESS COMMUNICATION SYSTEM - An apparatus and method are provided for feeding back channel quality information and performing scheduling using the fed-back channel quality information in a wireless communication system based on Orthogonal Frequency Division Multiple Access (OFDMA). In the OFDMA wireless communication system, forward performance degradation due to a decrease in an amount of reverse channel quality information is reduced, and also an increase in the reverse load due to channel quality information feedback is suppressed. A base station controls power of a physical channel using information fed back from a mobile station. In a method for feeding back channel quality information from the mobile station, sub-band-by-sub-band channel quality information is measured and channel-by-channel quality information of a number of channels is transmitted in order of sub-bands of better channel quality information. Average channel quality information for a total band is measured and transmitted. | 03-27-2014 |
20140086172 | APPARATUS AND METHOD FOR FEEDING BACK CHANNEL QUALITY INFORMATION AND SCHEDULING APPARATUS AND METHOD USING THE SAME IN A WIRELESS COMMUNICATION SYSTEM - An apparatus and method are provided for feeding back channel quality information and performing scheduling using the fed-back channel quality information in a wireless communication system based on Orthogonal Frequency Division Multiple Access (OFDMA). In the OFDMA wireless communication system, forward performance degradation due to a decrease in an amount of reverse channel quality information is reduced, and also an increase in the reverse load due to channel quality information feedback is suppressed. A base station controls power of a physical channel using information fed back from a mobile station. In a method for feeding back channel quality information from the mobile station, sub-band-by-sub-band channel quality information is measured and channel-by-channel quality information of a number of channels is transmitted in order of sub-bands of better channel quality information. Average channel quality information for a total band is measured and transmitted. | 03-27-2014 |
20140126668 | Method for processing CSI-RS in wireless communication system - A method for transmitting a Channel State Information-Reference Signal (CSI-RS) in an Orthogonal Frequency Division Multiple Access (OFDMA) system, the method comprising of determining a CSI-RS pattern type based on a Physical Resource Block (PRB) index of a subframe, assigning, when the subframe is supposed to carry the CSI-RS, CSI-RSs of first to Nth antenna ports to first to Nth Orthogonal Frequency Division Multiplexing (OFDM) symbols of a PRB based on the CSI-RS pattern type, and transmitting the subframe including the PRB in which CSI-RSs of the first to Nth antennas a mapped, wherein the first to Nth CSI-RS pattern types map CSI-RSs of the first to Nth antenna ports to the first to Nth OFDM symbols of the PRB in an alternate manner. | 05-08-2014 |
20140133343 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING FEEDBACK INFORMATION FOR INTER-CELL COOPERATIVE TRANSMISSION IN WIRELESS COMMUNICATION CELLULAR SYSTEM - A method for transmitting feedback information for collaborative transmission in a cellular radio communication system is provided. The method includes receiving, from the base station, collaborative cell information indicating a plurality of collaborative cells, determining at least two preferred collaborative cells among the plurality of collaborative cells, generating feedback information including cell indicators for discriminating between the at least two preferred collaborative cells and the other cell, precoding matrix indicators for the at least two preferred collaborative cells, and channel quality indicators, and transmitting the feedback information via one of a control channel and a data channel. | 05-15-2014 |
20140140298 | METHOD FOR ALLOCATING RESOURCE IN LTE SYSTEM - A fractional Resource Block (RB) allocation method which enables resource allocation in a unit smaller than RB to improve the capacity of Voice over Internet Protocol (VoIP) in a Long Term Evolution (LTE) system is provided. The method includes generating modulation symbols streams by performing channel coding and modulation on transport blocks corresponding to first and second data to be transmitted to respective users, multiplexing the modulation symbols stream alternately in unit of two continuous modulation symbols, and transmitting the multiplexed modulation symbol stream as mapped to corresponding resource. A resource arrangement method allows different users to share the same resource without using a Space Domain Multiple Access (SDMA) and indicates fractional RB allocation. | 05-22-2014 |
20140185527 | METHOD AND APPARATUS FOR TRANSMITTING CSI-RS AND DATA USING PARTIAL MUTING OF CSI-RS - A method and apparatus for transmitting Channel State Information Reference Symbol (CSI-RS) and data with partial muting of the CSI-RS are proposed. The method includes determining a CSI-RS pattern to be used among CSI-RS pattern candidates, determining a muting pattern for muting some resource elements constituting CSI-RS pattern candidates except for the determined CSI-RS pattern, mapping data symbols and CSI-RS to resource elements in a resource grid with rate patching in consideration of the CSI-RS pattern and muting pattern, and transmitting the data symbols and CSI-RS to a terminal. | 07-03-2014 |
20140219206 | TRANSMISSION/RECEPTION METHOD AND APPARATUS FOR UPLINK MIMO RETRANSMISSION IN LTE SYSTEM - A transmission/reception method and apparatus for a mobile communication system supporting uplink MIMO is provided. In the transmission method, a User Equipment (UE) transmits two transport blocks according to a predetermined number of layers and respective precoding indices, an evolve Node B (eNB) transmits, when one of the transport blocks is lost, a negative acknowledgement for the lost transport block, and the UE sets a precoding index for the lost transport block to a predetermined value to retransmit the lost transport block while maintaining the number of layers. | 08-07-2014 |
20140241287 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK CONTROL INFORMATION FOR RESOUCE ALLOCATION IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting and receiving Downlink Control Information (DCI) in a wireless communication system. A method for transmitting DCI by a base station includes generating the DCI including at least one of a data format indicator for at least one Transport Block (TB), and a DeModulation Reference Signal (DMRS) resource allocation indicator corresponding to the at least one TB; and sending the DCI to a terminal. The DMRS resource allocation indicator includes a rank pattern for the at least one TB, an allocated scrambling code type, and DMRS port information. | 08-28-2014 |
20140321396 | CHANNEL STATE INFORMATION REQUEST/FEEDBACK METHOD AND APPARATUS - Methods and apparatuses are provided for Channel State Information (CSI) feedback. An Uplink (UL) grant is received from a Node B. Information included in the UL grant is identified. If the information is mapped to at least one DownLink (DL) Component Carrier (CC) based on configuration information relating to at least one set including the at least one DL CC, at least one CSI corresponding to the at least one DL CC is generated. The generated at least one CSI is transmitted to the Node B. | 10-30-2014 |
20140321567 | TRANSMISSION/RECEPTION APPARATUS AND METHOD FOR SUPPORTING MIMO TECHNOLOGY IN A FORWARD LINK OF A HIGH RATE PACKET DATA SYSTEM - Methods and apparatus are provided for transmitting and receiving data in a communication system with a plurality of antennas. A method includes informing information related to a transmission time interval for transmission based on a second type reference signal; and transmitting data based on the second type reference signal in the transmission time interval defined by the information related to the transmission time interval for transmission based on the second type reference signal. The transmission time interval defined by the information related to the transmission time interval for transmission based on the second type reference signal is located on a fixed position within a period including a plurality of transmission time intervals. | 10-30-2014 |
20140321568 | METHOD AND APPARATUS FOR MANAGING CONTROL CHANNEL IN A MOBILE COMMUNICATION SYSTEM USING MULTIPLE ANTENNAS - Methods and apparatuses are provided for transmitting control information to a terminal, by a base station, in a Multiple Input Multiple Output (MIMO) mobile communication system. The control information is generated including a field indicating either a precoding scheme or a pilot format according to a type of pilot used for data demodulation in the terminal. The control information is transmitted to the terminal. | 10-30-2014 |
20140369298 | METHOD AND APPARATUS FOR TRANSMITTING UPLINK CONTROL INFORMATION IN MULTI-CARRIER WIRELESS COMMUNICATION SYSTEM - A method and apparatus are provided for transmitting Uplink Control Information (UCI) on a data channel in a multi-carrier wireless communication system. The method includes channel-coding a UCI with reference to a number of UCI bits available; dividing the channel coded UCI bits into a number of Physical Uplink Shared Channels (PUSCHs); and transmitting the UCI multiplexed with data on the individual PUSCHs. | 12-18-2014 |
20140376523 | METHOD AND APPARATUS FOR REPORTING CHANNEL STATUS INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus of a user equipment are provided for transmitting a channel status report in a communication system. The method includes receiving first information for at least one channel status report; generating a first channel status report corresponding to the first information for the at least one channel status report based on a reference signal in a first subframe; and transmitting the first channel status report based on the first information for the at least one channel status report in a second subframe. The first information for the at least one channel status report comprises information for a period and an offset, and a difference between the first subframe and the second subframe is a smallest value greater than or equal to a predetermined value. | 12-25-2014 |
20150023397 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING THE HYBRID-ARQ ACK/NACK SIGNAL IN MOBILE COMMUNICATION SYSTEM - An apparatus and method are provided for transmitting a symbol group in a mobile communication system. The method includes generating the symbol group to which an orthogonal sequence is applied; mapping the generated symbol group to an orthogonal frequency division multiple (OFDM) symbol and a multiple antenna array based on a symbol group index and a physical hybrid automatic repeat request (HARQ) indicator channel (PHICH) group index; and transmitting the mapped symbol group. The generated symbol group is mapped to the OFDM symbol and the multiple antenna array in an alternating pattern in accordance with the symbol group index. | 01-22-2015 |
20150049729 | METHOD AND APPARATUS FOR ALLOCATING ACKCH RESOURCES IN A WIRELESS COMMUNICATION SYSTEM - Methods and apparatuses are provided for wireless communication. A scheduling message including resource allocation information to allocate a resource for uplink transmission, is received. Data and a pilot are transmitted via the allocated resource for uplink transmission. An ACK/NACK resource is identified based on an index of the allocated resource for uplink transmission and information associated with the transmitted pilot. An ACK/NACK signal is received in response to the transmitted data using the identified ACK/NACK resource. | 02-19-2015 |
20150063324 | METHOD AND APPARATUS FOR REPORTING CHANNEL STATUS INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus of a user equipment are provided for transmitting a channel status report in a communication system. The method includes receiving first information for at least one channel status report; generating a first channel status report corresponding to the first information for the at least one channel status report based on a reference signal in a first subframe; and transmitting the first channel status report based on the first information for the at least one channel status report in a second subframe. The first information for the at least one channel status report comprises information for a period and an offset, and a difference between the first subframe and the second subframe is a smallest value greater than or equal to a predetermined value. | 03-05-2015 |
20150085737 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA - An apparatus and method are provided for receiving data by a first transceiver. The method includes receiving information for at least one transmission mode through higher layer signaling from a second transceiver; and receiving data on a first sub-frame based on a first demodulation reference signal (DMRS), if the at least one transmission mode is transmission mode 9 or transmission mode 10 and the first sub-frame is a multimedia broadcast multicast service single frequency network (MBSFN) sub-frame. | 03-26-2015 |
20150085954 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CODEBOOK SUBSET RESTRICTION BITMAP - A method for transmitting and receiving a codebook subset restriction bitmap is provided. The Codebook Subset Restriction (CSR) bitmap transmission method of an evolved Node B (eNB) in transmission mode 9 for communication with 8 antenna ports includes generating a CSR bitmap including bits corresponding to restricted precoding matrix indicators and rank indicators that are not allowed for reporting and transmitting the CSR bitmap to a User Equipment (UE). The CSR bitmap comprises 53 bits corresponding to a first codebook and 56 bits corresponding to a second codebook, the 53 bits corresponding to a first codebook comprise 16, 16, 4, 4, 4, 4, and 1 bits for layers 1, 2, 3, 4, 5, 6, 7, and 8, respectively, and the 56 bits corresponding to a second codebook comprise 16, 16, 16 and 8 bits for layers 1, 2, 3, and 4, respectively. | 03-26-2015 |