Patent application number | Description | Published |
20080225791 | METHODS FOR TRANSMITTING MULTIPLE ACKNOWLEDGMENTS IN SINGLE CARRIER FDMA SYSTEMS - A mapping scheme between a plurality of control channel element sets and a plurality of acknowledgement channel resource sets is established. Each of the control channel element sets includes at least one control channel element, and each of the acknowledgement channel resource sets includes at least one acknowledgement channel resource. In accordance with a scheduling grant transmitted using a control channel element set selected from the plurality of control channel element sets, a data packet is transmitted via a second node to a first node. Then, an acknowledgement channel message is transmitted via the first node to the second node by using at least one acknowledgement channel resource selected from the acknowledgement channel resource set that correspond to the control channel element set used for transmitting the scheduling grant in accordance with the mapping scheme. The acknowledgement channel message may be one of a positive acknowledgement message and a negative acknowledgement message. | 09-18-2008 |
20080225965 | METHODS AND APPARATUS TO IMPROVE PERFORMANCE AND ENABLE FAST DECODING OF TRANSMISSIONS WITH MULTIPLE CODE BLOCKS - A method includes separating resource elements from multiple code blocks into different groups, and decoding the code bits of the resource elements within each group without waiting for a completed reception of a transport block to start decoding. | 09-18-2008 |
20080232307 | Method and apparatus to allocate resources for acknowledgments in communication systems - A method and apparatus for transmission between a plurality of units of user equipment and a base station in a wireless communication system. For each of the units of user equipment, a plurality of control channel elements are mapped to a plurality of downlink acknowledgement channel resources in accordance with a first mapping scheme, and the plurality of control channel elements are mapped to a plurality of uplink acknowledgement channel resources in accordance with a second mapping scheme. The first mapping scheme and the second mapping scheme may be different for different units of user equipment. Alternatively, the first mapping scheme and the second mapping scheme may change over time. | 09-25-2008 |
20080232449 | Efficient uplink feedback in a wireless communication system - A method for transmitting control information by transmitting a reference signal from a first transceiver to a second transceiver, in response to the reception of the reference signal, determining at the second transceiver a plurality of control channel elements based upon the received reference signal, jointly encoding the plurality of control channel elements at the second transceiver to generate a control signal, and transmitting the control signal from the second transceiver to the first transceiver. | 09-25-2008 |
20080232489 | Spatial interleaver for MIMO wireless communication systems - A method for transmission is provided to include demultiplexing information to be transmitted into a plurality of stream blocks, encoding each of the stream blocks according to a corresponding coding scheme to generate a plurality of encoded streams, interleaving the plurality of encoded streams in a bit-level to generate a plurality of bit-level interleaved streams, modulating each of the bit-level interleaved streams according to a corresponding modulation scheme to generate a plurality of modulated symbol streams, interleaving the plurality of modulated symbol streams in a symbol-level to generate a plurality of symbol-level interleaved streams, precoding the plurality of symbol-level interleaved streams according to a precoding scheme to generate a plurality of precoded streams, and transmitting the plurality of precoded streams via a plurality of antennas. | 09-25-2008 |
20080267158 | TRANSMIT DIVERSITY FOR ACKNOWLEDGEMENT AND CATEGORY 0 BITS IN A WIRELESS COMMUNICATION SYSTEM - A method of transmitting acknowledgement/nonacknowledgement (ACK/NACK) signals including multiplexing ACK/NACK signals; and repeatedly transmitting for predetermined times the multiplexed signal with each of repetitions of transmitting the multiplexed signal being spread in a frequency domain and being mapped to a plurality of discrete resource units each having a pair of neighboring subcarriers and a predetermined number of Orthogonal Frequency Division Multiplexing (OFDM) control symbols. | 10-30-2008 |
20080298224 | Methods and apparatus for mapping modulation symbols to resources in OFDM systems - A method for transmission, by dividing a transmission resource in a time domain subframe into a plurality of equal duration resource elements in a time and frequency domain, segregating the plurality of resource elements into a plurality of resource regions, modulating information to be transmitted to generate a sequence of modulation symbols at a transmitter, mapping the sequence of modulation symbols into the plurality of resource elements in the plurality of resource regions, and transmitting the modulation symbols via a plurality of antennas using the respective corresponding resource elements to a receiver. The mapping of the modulation symbols in at least one resource region is independent of a certain control channel information that is carried in said time domain subframe, and the mapping of the modulation symbols in at least another resource region is dependent upon said certain control channel information that is carried in said subframe. The information to be transmitted may be encoded to generate a plurality of code blocks, with roughly equal number of resource elements assigned to each of the plurality of code blocks in at least one resource region. Alternatively, the time domain subframe may contain only one resource region. | 12-04-2008 |
20080303699 | MIMO wireless precoding system robust to power imbalance - The present invention relates to methods and apparatus for preventing power imbalance in a multiple input multiple output (MIMO) wireless precoding system. According to one aspect of the present invention, a codebook is constructed with a first subset of codewords that are constant modulus matrices, and a second subset of codewords that are non-constant modulus matrices. A mapping scheme is established between the first subset of codewords and the second subset of codewords. When a unit of user equipment feeds back a first codeword that is a non-constant modulus matrix, the Node-B may replace the first codewords with a second codeword that is selected from the first subset of codewords and that corresponds to the first codeword in accordance with the mapping scheme. | 12-11-2008 |
20080304588 | Methods and apparatus for mapping control channels to resources in OFDM systems - A method for data transmission. The method including the steps of generating at least one resource tree, mapping a plurality of resource elements into respective leaf nodes in the at least one resource tree according to a certain mapping scheme, with each node in the at least one resource tree representing a resource allocation scheme for data transmission, and transmitting data using a resource allocation scheme selected from among the plurality of resource allocation schemes represented by respective nodes in the at least one resource tree. In response to reception of the data, a receiver decodes the data by recursively applying the plurality of resource allocation schemes represented by respective nodes in the at least one resource tree until the data is decoded. | 12-11-2008 |
20080307427 | Methods and apparatus for channel interleaving in OFDM systems - A method and apparatus for channel interleaving in a wireless communication system. In one aspect of the present invention, the data resource elements are assigned to multiple code blocks, and the numbers of data resource elements assigned to each code block are substantially equal. In another aspect of the present invention, a time-domain-multiplexing-first (TDM-first) approach and a frequency-domain-multiplexing-first (FDM-first) approach are proposed. In the TDM-first approach, at least one of a plurality of code blocks are assigned with a number of consecutive data carrying OFDM symbols. In the FDM-first approach, at least one of the plurality of code blocks are assigned with all of the data carrying OFDM symbols. Either one of the TDM first approach and the FDM-first approach may be selected in dependence upon the number of the code blocks, or the transport block size, or the data rate. | 12-11-2008 |
20090006518 | Simple MIMO precoding codebook design for a MIMO wireless communications system - The present invention relates to methods and apparatus for establishing a precoding codebook for a Multiple Input Multiple Output (MIMO) wireless communication system. The precoding codebook includes a plurality of codebook entries. Each codebook entry includes four sets of vectors for four respective corresponding transmission ranks. The vectors may be predetermined, or generated from source unitary matrices. In addition, the codebook is fully nested. | 01-01-2009 |
20090015443 | Transmit methods for CCFI/PCFICH in a wireless communication system - A method of transmitting a control channel format indicator (CCFI), also known as PCFICH (Physical Control Format Indicator Channel), in case where the length of a coded CCFI is not an integer multiple of three, including mapping a plurality of two-bit CCFI into a codebook with each component codeword having three bits; generating a sequence of codewords selected from the codebook by repeating the selected component codeword for predetermined times; generating a codeword by concatenating the sequence of the selected component codewords with the original CCFI bits; and transmitting the codeword carrying information of CCFI. The method further includes a step of generating a permutation of each of the four codewords by assigning K repetitions of the three-bit component codeword to the number of K resource units respectively and mapping remaining K bits of each of the four codewords separately to the number of K resource units. | 01-15-2009 |
20090019337 | Methods and apparatus to compute CRC for multiple code blocks - A method and a circuit for generating cyclic redundancy checks. The method calculates a plurality of cyclic redundancy checks for a transport block with a plurality of information bits. At least one cyclic redundancy check among the plurality of cyclic redundancy checks is calculated based on a subset of information bits, and at least one information bit among the plurality of information bits is not within said subset of the information bits. In addition, a transport block cyclic redundancy check may be calculated based on all the information bits. | 01-15-2009 |
20090028129 | Rate matching for hybrid ARQ operations - A method of rate matching process of the hybrid Automatic Repeat reQuestion (HARQ) operation in which coded bits are selected for a transmission depends on whether the transmission is a first transmission of a new packet or a retransmission of an existing packet. In downlink of long term evolution (LTE) system, a downlink grant message is transmitted along with the packet data transmission. The grant message may also contain the redundancy version (RV). A new data indicator (NDI) is introduced to indicate the start of a new packet. The improved method of rate matching may be implanted into either a transmitter or a receiver. | 01-29-2009 |
20090041151 | Pilot boosting and traffic to pilot ratio estimation in a wireless communication system - Methods and circuits for assigning pilot boosting factors and calculating traffic to pilot ratios in a wireless communication system. The data to be transmitted is first modulated to generate a plurality of data modulation symbols. The plurality of data modulation symbols and a plurality of reference signal symbols are mapped into transmission resources of each of a plurality of antennas in accordance with a transmit diversity scheme. The transmission resources of each of the antennas are divided into a plurality of subcarriers in a frequency domain and a plurality of time units in a time domain. Then, a power scaling factor are assigned for data modulation symbols on each of the antennas in dependence upon power levels of the reference signal symbols to maintain a fixed power level across the plurality of antennas in each time unit. Finally, the data modulation symbols and the reference signal symbols are transmitted via the plurality of antennas in accordance with the mapping scheme and the assigned scaling factors. | 02-12-2009 |
20090046646 | APPARATUS AND METHOD FOR ALLOCATING CODE RESOURCES TO UPLINK ACK/NACK CHANNELS IN A CELLULAR WIRELESS COMMUNICATION SYSTEM - A method and apparatus are provided for allocating code resources to ACK/NACK channel indexes, when UEs need ACK/NACK transmission in a wireless communication system in which a predetermined number of orthogonal cover Walsh codes is selected from among available orthogonal cover Walsh codes, at least one subset is formed, having the selected orthogonal cover Walsh codes arranged in an ascending order of cross interference, subsets are selected for use in first and second slots of a subframe, and the orthogonal cover Walsh codes of the subset selected for each slot and ZC sequence cyclic shift values are allocated to the ACK/NACK channel indexes. | 02-19-2009 |
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 |
20090077456 | Methods and apparatus to generate multiple CRCs - Methods and apparatus for generating cyclic redundancy checks (CRCs). In one aspect of the present invention, a plurality of cyclic redundancy checks are calculated based upon a plurality of bits by using a selected cyclic redundancy check generator polynomial, at least one cyclic redundancy check is calculated based upon a first subset of the plurality of bits with a certain bit ordering, and at least another cyclic redundancy check is calculated based upon a second subset of the plurality of bits with a different bit ordering. The second subset of bits may overlap with the first subset of bits. In another aspect, a plurality of cyclic redundancy checks are calculated based upon a plurality of bits by using a plurality of different cyclic redundancy check generator polynomials. A first cyclic redundancy check generator polynomial is used for calculating a first cyclic redundancy check based upon a first plurality of bits, and a second cyclic redundancy check generator polynomial is used for calculating a second cyclic redundancy check based upon a second plurality of bits. | 03-19-2009 |
20090086849 | Method and apparatus of improved circular buffer rate matching for turbo-coded MIMO-OFDM wireless systems - Methods and apparatus for determining the starting points of redundancy version transmissions in a circular rate matching operation. At least one block of information bits to be transmitted are encoded to generate a plurality of coded bits, which are then segmented into a plurality of sub-blocks of coded bits. Each of the sub-blocks of coded bits is interleaved by using a certain interleaver. The interleaved coded bits of the plurality of sub-blocks are collected and filled into a circular buffer having a plurality of redundancy versions in the circular buffer, with each redundancy version corresponding to a starting bit index in the circular buffer. For each transmission, a subset of bits are selected from the circular buffer by selecting a redundancy version from among the plurality of redundancy version. The selected subset of bits are modulated by using a certain modulation scheme, and are transmitted via at least one antenna. The redundancy versions of the circular being determined such that in at least one pair of redundancy versions, the number of bits between the starting point of a first redundancy version and the starting point of a second redundancy version is not divisible by at least one modulation order. | 04-02-2009 |
20090092148 | RESOURCE REMAPPING AND REGROUPING IN A WIRELESS COMMUNICATION SYSTEM - Methods and apparatus for remapping and regrouping transmission resources in a wireless communication system. First, a set of new permutation algorithms based on Galois field operation is proposed. Then the proposed algorithms and the known Pruned Bit Reversal Ordering (PBRO) algorithm are applied to several of various resource mapping schemes, including slot or symbol level Orthogonal Cover (OC)/Cyclic Shift (CS) mapping, cell-specific slot-level and symbol-level CS hopping patterns, and subframe and slot level base sequence hopping patterns. | 04-09-2009 |
20090098876 | Asynchronous hybrid ARQ process indication in a MIMO wireless communication system - Methods and apparatus for transmitting Asynchronous Hybrid Automatic Repeat reQuest (ARQ) process identities in a wireless communication system. A linking scheme is established between at least two sets of process identities of two respective corresponding codewords. When a first process identity is selected from among a first set of process identities of a first codeword, a second process identity may be derived in dependence upon the first process identity and the established linking scheme. Finally, a first packet from the first codeword is transmitted using a first transmission channel indicated by the first process identity, and a second packet is transmitted from the second codeword using a second transmission channel indicated by the second process identity. In addition, a control message including only the first process identity is transmitted. | 04-16-2009 |
20090147865 | Uplink feedback for supporting MIMO operation in the LTE downlink - A quantization method of transmission of channel quality information (CQI) includes measuring two measurements SINRs and calculating a difference (i.e., Delta SINR) between the two measurements of the SINRs; determining a CQI | 06-11-2009 |
20090149207 | Physical broadcast channel (PBCH) transmission for reliable detection of antenna configuration - Systems and methods for transmitting data related to the configuration of transmit antennas are disclosed. These methods may include obtaining a data for transmission, encoding the data and modulating the data. During the modulating of the data, the data may be configured in such a way as to convey the configuration of the data through the modulation of the data. These methods may also include obtaining an antenna configuration, obtaining a representation of the antenna configuration, and masking the data with an error correcting code, where the mask corresponds to the antenna configuration. | 06-11-2009 |
20090163142 | Methods and apparatus for channel quality indication feedback in a communication system - Methods and apparatus for feeding back channel quality indication in a communication system. First, a first channel quality indication index is determined in dependence upon a channel quality estimation of a first transmission channel, and a second channel quality indication index is determined in dependence upon a channel quality estimation of a second transmission channel. A differential channel quality indication index of the second channel quality indication index is determined with reference to the first channel quality indication index in dependence upon a differential compression scheme. Then, the first channel quality indication index and the differential channel quality indication index are reported. | 06-25-2009 |
20090175371 | Methods and apparatus for downlink PDSCH power setting - Methods and apparatus for transmitting power setting information in a downlink Physical Downlink Shared Channel (PDSCH) in a communication system. In this communication system, a plurality of methods for calculating traffic-to-pilot ratios (T2P) are established. In addition, a mapping scheme between a plurality of overhead signals and a plurality of reference signal (RS) overhead ratios, η | 07-09-2009 |
20090201863 | METHODS AND APPARATUS TO ALLOCATE ACKNOWLEDGEMENT CHANNELS - Methods and apparatus for allocating acknowledgement channels in a communication network. A linking scheme is established between indices of a plurality of physical hybrid automatic repeat-request indicator channels (PHICHs), and a combination of indices of control channel elements (CCEs) or indices of physical resource blocks (PRBs) and indices of demodulation reference signals (DMRSs). A base station (BS) transmits a scheduling grant to a unit of user equipment (UE) by using a plurality of CCEs. In response to receiving a data packet and a DMRS from the UE, the BS determines an index of a PHICH within the plurality of PHICHs in dependence upon at least one index of the CCEs used to transmit the scheduling grant or at least one index of the PRBs used to transmit the data packet, and an index of the transmitted DMRS in accordance with the linking scheme established. Finally, the BS transmits an acknowledgement signal to the UE by using the PHICH indicated by the determined index. | 08-13-2009 |
20090253447 | Message-based approach for improved interference power estimation - A method of operating a base station comprising determining one or more time-frequency resources to be used for interference power estimation, generating a message indicating the one or more time-frequency resources to be used for interference power estimation, and transmitting the message to a subscriber station. | 10-08-2009 |
20090254790 | Methods and apparatus to improve communication in a relay channel - A system and method for relaying data communications in a Hybrid Automatic Repeat Request (HARQ) network. The system and method operable to receive a data communication packet from a base station during a first transmission time interval and simultaneously receive an acknowledgement signal from a subscriber station; and transmit a data communication packet to a subscriber station during a second transmission time interval and simultaneously transmit an acknowledgement signal to a base station. | 10-08-2009 |
20090268680 | SIGNALING FORMATS FOR INDICATING UNUSED RESOURCE BLOCKS IN LTE SYSTEMS - Systems and methods are disclosed for use in a wireless communication system including a base station configured to identify unused PRBS. This base station includes a communication unit that is in communication with at least one subscriber station and a processor configured to identify at least one PRB as unused. Upon determining that at least one PRB is unused, the base station transmits information related to the unused PRBs to the at least one subscriber station through a control message. | 10-29-2009 |
20090268790 | Methods and apparatus for network coding in a communication system - A system and method for relaying communications in a wireless communication network. A relay station capable of relaying wireless communications includes a plurality of receiver antennas and a plurality of transmitter antennas. The plurality of receiver antennas is operable to receive, in a first time interval, a first communication from a base station and a second communication from a subscriber station. The plurality of transmitter antennas is operable transmit a third communication to the base station and the subscriber station in a second time interval. The relay station also includes a network encoder. The network encoder is configured to generate a combined symbol constellation. The combined symbol constellation is generated by combining a first symbol constellation transmitted in said first communication with a second symbol constellation transmitted in said second communication. Further, the third communication comprises said combined symbol constellation. | 10-29-2009 |
20090325590 | Inter-cell interference avoidance for downlink transmission - A system and method for inter-cell interference avoidance. A base station is configured to perform interference avoidance. The base station receives feedback information from either a second base station or a subscriber station served by the second base station. The base station selects a codebook vectors or matrices for transmission to subscriber stations based, at least in part, on a portion of the feedback information. The base station is further configured to select which subscriber stations will participate in interference avoidance calculations. | 12-31-2009 |
20090325591 | Downlink wireless transmission schemes with inter-cell interference Mitigation - A system and method for inter-cell interference avoidance. A device capable of performing channel estimation is configured to divide a codebook into two sets. A first set of said two sets corresponds to codebook information that will cause an interference in a received signal to be less than a threshold. The device further is configured to send feedback information corresponding to the first or second set, or both. A base station is configured to select a preceding vector or matrix based, in part, on a portion of the feedback information. | 12-31-2009 |
20100061287 | Efficient coding schemes for retransmissions in multicast transmission - For use in a multicast wireless communication network comprising a plurality of base stations, various methods for encoding retransmissions to a plurality of mobile stations are provided. Each method includes transmitting a plurality of data packets to the plurality of mobile stations. Each method also includes creating at least one redundancy packet by using at least two of the plurality of data packets and binary XOR addition. Each method further includes transmitting at least one redundancy packet to the plurality of mobile stations. | 03-11-2010 |
20100085867 | System and method for an EMBS design to optimize spectrum efficiency, link adaptation and EMBS traffic security - A wireless communication network capable of providing Enhanced Multi-Broadcast Service (EMBS) to a plurality of subscriber stations. At least one base station in the network transmits a downlink frame to the plurality of subscriber stations. The downlink frame includes an EMBS MAP configured to identify locations of EMBS data bursts. The downlink frame also includes a security and data multiplexing burst and EMBS data burst. A number of the subscriber stations are configured to decode the EMBS MAP to determine the locations of a number of EMBS data burst in a number of subsequent downlink frames. | 04-08-2010 |
20100124186 | Method and apparatus for HARQ operation with network coding - For use in a wireless communication network, methods for encoding information bit streams at a relay station are provided. Each method includes receiving data packets from a base station and a mobile station. Each method also includes decoding the packets and re-encoding the packets. Each method further includes combining the re-encoded packets into another packet using an XOR operation, and transmitting the other packet to the base station and the mobile station. | 05-20-2010 |
20100124197 | Method and apparatus for resource allocation in a communication system - A base station capable of communicating with a plurality of subscriber stations is configured to allocate a plurality of resource units to at least one subscriber station. The base station includes a controller configured to allocate a plurality of resource units from a two-dimensional logical matrix of resource units. The controller is configured to generate at least two indicator values, wherein the two indicator values are configured to identify the allocated resource units. The base station also includes a transmitter configured to transmit the two indicators to the subscriber station. The base station also is configured to construct the two-dimensional logical matrix that is adapted to enable contiguous and diverse resource unit allocations. | 05-20-2010 |
20100153816 | Methods and apparatus to identify the accessibility of femto-base stations in communication systems - A system and method for identifying the accessibility of femto base stations in a communication system. The system and method includes a plurality of macro base stations, open-access femto base stations and femto base stations with different subscriber groups. At least one of the base stations includes a transmitter configured to apply a base station identifier, such as a closed subscription group identifier, as a cyclic redundancy check (CRC) mask to XOR (exclusive OR) the CRC of a broadcast channel communication or an input to generate a scrambling sequence to the broadcast channel communication. | 06-17-2010 |
20100202340 | SYSTEM AND METHOD OF CONSTRUCTING A RESOURCE MATRIX FOR TRANSMITTING MULTICAST BROADCAST SERVICE (MBS) DATA - A base station comprises a controller configured to construct a resource matrix comprising resource units. The controller also is configured to allocate a plurality of resource units within the resource matrix containing resource units that carry Enhanced-Multicast Broadcast Service (E-MBS) data, and to generate at least two indicator values. The at least two indicator values are configured to identify at least some of the plurality of resource units containing E-MBS data within the resource matrix. The base station further comprises a transmitter configured to transmit the E-MBS data placed in the resource matrix and the at least two indicators to a subscriber station. | 08-12-2010 |
20100202371 | System and method for efficient enhanced multicast broadcast system (E-MBS) map decoding - A wireless communication network is provided. The network comprising a plurality of base stations capable of wireless communication with a plurality of subscriber stations within a coverage area of the network. At least one of the plurality of base stations comprises a transmitter configured to transmit a downlink frame. The downlink frame comprising a first Enhanced Multicast Broadcast Service (E-MBS) MAP. The first E-MBS MAP comprises a field with an indicator to indicate a next E-MBS MAP to be decoded by a subscriber station. The subscriber station, upon decoding the first E-MBS MAP, refrains from decoding subsequent E-MBS MAPS that precede the next E-MBS MAP to be decoded by the subscriber station in accordance with the indicator. | 08-12-2010 |
20100215112 | Method and apparatus for multiple input multiple output (MIMO) transmit beamforming - A wireless communications network is provided. The wireless communications network comprises a plurality of base stations. Each one of said base stations is capable of wireless communications with a plurality of subscriber stations. At least one of said plurality of base stations comprises a processor configured to select a codeword from a codebook and precode data with the selected codeword, and a transmitter configured to transmit the precoded data. Rank 1 of the codebook is selected from the following algorithm: | 08-26-2010 |
20100220621 | TECHNIQUES FOR SUPPORTING LOW DUTY CYCLE MODE OF BASE STATION - A Mobile Station (MS) apparatus and method, to search for a Base Station (BS) in a Low Duty Cycle (LDC) mode in a wireless communication system, and a network entity apparatus and method, assist or support the MS, are provided. The method for the MS to search for the BS in LDC mode in the wireless communication system includes obtaining LDC information of one or more BSs in LDC mode, determining the LDC patterns of the one or more BSs in LDC mode based on the LDC information, the LDC patterns comprising at least one of an Available Interval (AI), an UnAvailable Interval (UAI), a starting time of the AI, an ending time of the AI, a length of the AI, a starting time of the UAI, an ending time of the UAI, a length of the UAI, and a cycle of the LDC, searching for any of the one or more BSs in LDC mode during their respective AI, and if a BS is found, performing a follow-up operation based on the found BS. | 09-02-2010 |
20100246515 | TECHNIQUES FOR PILOT STREAM REMAPPING IN OFDM WIRELESS COMMUNICATION SYSTEM - A method and base station apparatus for transmitting pilot data in a wireless communication system, and a method and mobile station apparatus for receiving pilot data in a wireless communication system are provided. The method for transmitting pilot data in a wireless communication system includes determining a pilot pattern in at least one resource block for each of one or more pilot streams, and transmitting the one or more pilot streams based on the determined respective pilot pattern in the at least one resource block, wherein the at least one resource block comprises a plurality of subcarriers and a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols. | 09-30-2010 |
20100272193 | DATA COMMUNICATION USING 2D BAR CODES - A Two-Dimensional (2D) code receiver and transmitter, and methods for their operation in a 2D code communication system, are provided. The method for operating the 2D code receiver includes receiving a sequence of 2D codes from a 2D code transmitter having data encoded therein, wherein the 2D codes of the sequence are received in succession, and decoding the received a sequence of 2D codes into the data. | 10-28-2010 |
20100302980 | System and method for preserving battery life for a mobile station - A mobile station capable of accessing a wireless communication network having a plurality of base stations is provided. The mobile station is configured to determine if a battery level of the mobile station is below a selected one of a plurality of power level thresholds. The mobile station is also configured to, upon a determination that the battery level is below the selected power level threshold, send a battery report to a first base station of the wireless communication network. The mobile station is further configured to enter a battery power preservation mode. The battery power preservation mode may include an enhanced idle mode, an enhanced sleep mode, or a persistent allocation mode. | 12-02-2010 |
20100322342 | METHODS AND APPARATUS TO ENCODE BANDWIDTH REQUEST MESSAGE - A subscriber station is capable of encoding a bandwidth request message. The subscriber station includes a controller and a transmitter coupled to the controller. The transmitter includes a linear channel encoder and a Quadrature Phase Shift Keying (QPSK) modulation block. The channel encoder uses a generator matrix comprising alphabets from Galois field (GF) (2). Each column of the generator matrix belongs to a twelve dimensional subspace and wherein the code generated using the generator matrix has a minimum hamming distance no greater than thirty. | 12-23-2010 |
20100329374 | TECHNIQUES FOR ESTIMATING CHANNEL AND INTERFERENCE IN OFDM WIRELESS COMMUNICATION SYSTEM WITH MULTIPLE ANTENNAS - A method and multiple antenna transmitting apparatus for transmitting a midamble in a wireless communication system, and a method and receiving device for receiving a midamble in a wireless communication system are provided. A method for transmitting a midamble by a multiple antenna transmitting device includes determining a pattern for a midamble including null subcarriers and pilot subcarriers, wherein each of the pilot subcarriers corresponds to one of a plurality of pilot signals, and each of the plurality of pilot signals corresponds to a different one of a plurality of transmit antennas, and transmitting the pilot signals in corresponding pilot subcarriers based on the determined pattern, wherein the pilot signals are transmitted in an Orthogonal Frequency Division Multiplexing (OFDM) symbol of a resource block comprising a plurality of subcarriers and a plurality of OFDM symbols. | 12-30-2010 |
20110051649 | METHODS FOR EFFICIENT CONFIGURATION OF CONTROL CHANNEL TRANSMISSION IN WIRELESS SYSTEMS - An apparatus and method for configuring Enhanced Multicast and Broadcast Service (E-MBS) Scheduling Intervals (MSIs) in a communication system are provided. The method includes selecting a number N of MSIs, and selecting a periodicity of each of the N MSIs. By selecting a number N of MSIs and a periodicity of each of the N MSIs, a communication system is able to more efficiently decode E-MBS data. | 03-03-2011 |
20110051684 | METHODS AND APPARATUS TO SUPPORT COORDINATED INTERFERENCE MITIGATION IN MULTI-TIER NETWORKS - For use in a wireless network, a femtocell base station in communication with at least one first mobile station is provided. The femtocell base station is configured adjust a resource of the femtocell base station to mitigate interference at a second mobile station. In certain embodiments, the femtocell base station is configured to coordinate a handover of the at least one first mobile station from the femtocell base station to a neighboring base station. In certain embodiments, the femtocell base station is configured to transmit a message regarding the resource adjustment to the at least one first mobile station. | 03-03-2011 |
20110066916 | SYSTEM AND METHOD FOR STRUCTURED LDPC CODE FAMILY - A low density parity check (LDPC) family of codes is constructed by: determining a protograph for a mother code for the LDPC family of codes. The protograph is lifted by a lifting factor to design code specific protograph for a code. The method also includes constructing a base matrix for the code. The base matrix is constructed by replacing each zero in the code specific protograph with a ‘−1’; and replacing each one in the code specific protograph with a corresponding value from the mother matrix. The LDPC code includes a codeword size of at least 1344, a plurality of information bits, and a plurality of parity bits. The LDPC code is based on a mother code of code length 672. | 03-17-2011 |
20110086651 | TECHNIQUES FOR INTERFERENCE MITIGATION IN MULTI-TIER COMMUNICATION SYSTEM - A method and a Mobile Station (MS), for use in a wireless communication network comprising a plurality of Base Stations (BSs) capable of communicating with a plurality of MSs, wherein at least some of the BSs are Femtocell BSs (FBSs) and at least some of the BSs are Macrocell BSs (MBSs), for mitigating interference are provided. The method includes detecting, by an MS, an interfering Closed Subscriber Group (CSG) FBS that the MS is not authorized to access, and transmitting, by the MS, a request for mitigation of interference. | 04-14-2011 |
20110110451 | TECHNIQUES FOR TRANSFORMATION CODEBOOK ANTENNA BEAMFORMING IN OFDM WIRELESS COMMUNICATION SYSTEM - Methods for a transmitter station and a receiver station to perform beamforming in a wireless communication system, and a transmitter station and a receiver station to perform the corresponding method, are provided. The method for the transmitter station to perform beamforming in the wireless communication system includes estimating and tracking a long-term averaged and normalized channel correlation matrix between the transmitter station and a receiver station, determining beamforming coefficients based on the tracked long-term averaged and normalized channel correlation matrix, and communicating with the receiver station using the determined beamforming coefficients, wherein the receiver station also estimates and tracks the long term averaged and normalized channel correlation matrix, and determines beamforming coefficients based on the tracked long-term averaged and normalized channel correlation matrix. | 05-12-2011 |
20110111745 | SYSTEMS AND METHODS FOR CELL SEARCH IN MULTI-TIER COMMUNICATION SYSTEMS - A mobile station capable of accessing a wireless network comprising a plurality of macro-base stations and a plurality of femto-base stations. The mobile station comprises: 1) a transceiver that communicates with the macro-base stations and femto-base stations; 2) a message processor coupled to the transceiver; and 3) a memory coupled to the message processor that stores a white list of CSGID values associated with at least one closed subscription group to which the mobile station subscribes. The message processor transmits to a first macro-base station a first control message that contains at least one CSGID value from the white list. The message processor receives from the first macro-base station a second control message that contains the information of at least one femto-base station (FBS) identifier associated with the at least one CSGID value. The mobile station uses the information of the at least one FBS identifier to access a first femto-base station associated with the at least one FBS identifier. | 05-12-2011 |
20110149715 | MIMO CONTROL SIGNALING IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method for data transmission in a communication system. The method includes determining, at the transmitter, whether to transmit data signal using a single codeword or two codewords. When it is determined that the single codeword transmission is used, coding, by the transmitter, a control signal by using a first signal format, with the control signal coded by the first signal format carrying information regarding the single codeword. When it is determined that the two codewords transmission is used, coding, by the transmitter, the control signal by using a second signal format, with the control signal coded by the second signal format carrying information regarding both of the two codewords. The method also includes transmitting the data signal and the control signal according to the determined transmission format from the transmitter to the receiver. | 06-23-2011 |
20110200003 | METHODS AND APPARATUS FOR MAPPING MODULATION SYMBOLS TO RESOURCES IN OFDM SYSTEMS - A method for transmission, by dividing a transmission resource in a time domain subframe into a plurality of equal duration resource elements in a time and frequency domain, segregating the plurality of resource elements into a plurality of resource regions, modulating information to be transmitted to generate a sequence of modulation symbols at a transmitter, mapping the sequence of modulation symbols into the plurality of resource elements in the plurality of resource regions, and transmitting the modulation symbols via a plurality of antennas using the respective corresponding resource elements to a receiver. The mapping of the modulation symbols in at least one resource region is independent of a certain control channel information that is carried in said time domain subframe, and the mapping of the modulation symbols in at least another resource region is dependent upon said certain control channel information that is carried in said subframe. The information to be transmitted may be encoded to generate a plurality of code blocks, with roughly equal number of resource elements assigned to each of the plurality of code blocks in at least one resource region. Alternatively, the time domain subframe may contain only one resource region. | 08-18-2011 |
20110212729 | TECHNIQUES FOR IDENTIFYING BASE STATIONS IN COMMUNICATION SYSTEM - A method and a Mobile Station (MS), for use in a wireless communication network comprising a plurality of Base Stations (BSs) capable of communicating with a plurality of MSs, wherein at least some of the BSs are Femtocell BSs (FBSs) and at least some of the BSs are Macrocell BSs (MBSs), for identifying the BSs at the MS, are provided. The method includes receiving at least one of a globally unique BS ID and an Operator ID from an FBS via a Broadcast CHannel (BCH), deriving a Closed Subscriber Group IDentifier (CSG ID) from the received at least one of the globally unique BS ID and the Operator ID, and determining, based on the derived CSG ID, if the FBS is a CSG FBS to which the MS is subscribed. | 09-01-2011 |
20110280211 | TRANSMIT DIVERSITY FOR ACKNOWLEDGEMENT AND CATEGORY 0 BITS IN A WIRELESS COMMUNICATION SYSTEM - A method of transmitting acknowledgement/nonacknowledgement (ACK/NACK) signals including multiplexing ACK/NACK signals; and repeatedly transmitting for predetermined times the multiplexed signal with each of repetitions of transmitting the multiplexed signal being spread in a frequency domain and being mapped to a plurality of discrete resource units each having a pair of neighboring subcarriers and a predetermined number of Orthogonal Frequency Division Multiplexing (OFDM) control symbols. | 11-17-2011 |
20110305226 | RESOURCE REMAPPING AND REGROUPING IN A WIRELESS COMMUNICATION SYSTEM - Methods and apparatus for remapping and regrouping transmission resources in a wireless communication system. First, a set of new permutation algorithms based on Galois field operation is proposed. Then the proposed algorithms and the known Pruned Bit Reversal Ordering (PBRO) algorithm are applied to several of various resource mapping schemes, including slot or symbol level Orthogonal Cover (OC)/Cyclic Shift (CS) mapping, cell-specific slot-level and symbol-level CS hopping patterns, and subframe and slot level base sequence hopping patterns. | 12-15-2011 |
20120015649 | METHODS AND APPARATUS TO SUPPORT BASE STATION DETECTION AND SELECTION IN MULTI-TIER WIRELESS NETWORKS - A subscriber station can efficiently determine an accessible base station by scanning a subset of base stations based on an optimized list received from a serving base station. The subscriber station includes a white list that contains information regarding a number of closed subscriber group (CSG) base stations to which the subscriber station is subscribed. The subscriber station can transmit a request message that includes one or more of: indication of whether the detected identifier of the femto base station is in the whitelist or not; and its location information. In response, the base station can send a message that includes the nearby femtocells and whether the femtocell is accessible or inaccessible to the subscriber station. The femto base station can be designed to be in transmission off mode when none of its subscribers is in its coverage. The serving base station can select a set of the accessible femtocells to the subscriber station, and request the selected femtocells to monitor an uplink signaling of the subscriber station so that the femtocell can be awaken when the femtocell is in transmission off mode or be aware that the subscriber station is in proximity, if the uplink signaling is detected. | 01-19-2012 |
20120076221 | COMMUNICATION METHODS FOR CCFI/PCFICH IN A WIRELESS COMMUNICATION SYSTEM - A method of transmitting a control channel format indicator (CCFI), also known as PCFICH (Physical Control Format Indicator Channel), in case where the length of a coded CCFI is not an integer multiple of three, including mapping a plurality of two-bit CCFI into a codebook with each component codeword having three bits; generating a sequence of codewords selected from the codebook by repeating the selected component codeword for predetermined times; generating a codeword by concatenating the sequence of the selected component codewords with the original CCFI bits; and transmitting the codeword carrying information of CCFI. The method further includes a step of generating a permutation of each of the four codewords by assigning K repetitions of the three-bit component codeword to the number of K resource units respectively and mapping remaining K bits of each of the four codewords separately to the number of K resource units. | 03-29-2012 |
20120076222 | METHOD AND APPARATUS FOR USING CONTROL CHANNEL FORMAT INDICATOR (CCFI) CODEWORDS IN A WIRELESS COMMUNICATION SYSTEM - A method of transmitting a control channel format indicator (CCFI), also known as PCFICH (Physical Control Format Indicator Channel), in case where the length of a coded CCFI is not an integer multiple of three, including mapping a plurality of two-bit CCFI into a codebook with each component codeword having three bits; generating a sequence of codewords selected from the codebook by repeating the selected component codeword for predetermined times; generating a codeword by concatenating the sequence of the selected component codewords with the original CCFI bits; and transmitting the codeword carrying information of CCFI. The method further includes a step of generating a permutation of each of the four codewords by assigning K repetitions of the three-bit component codeword to the number of K resource units respectively and mapping remaining K bits of each of the four codewords separately to the number of K resource units. | 03-29-2012 |
20120224544 | ASYNCHRONOUS HYBRID ARQ PROCESS INDICATION IN A MIMO WIRELESS COMMUNICATION SYSTEM - Methods and apparatus for transmitting Asynchronous Hybrid Automatic Repeat reQuest (ARQ) process identities in a wireless communication system. A linking scheme is established between at least two sets of process identities of two respective corresponding codewords. When a first process identity is selected from among a first set of process identities of a first codeword, a second process identity may be derived in dependence upon the first process identity and the established linking scheme. Finally, a first packet from the first codeword is transmitted using a first transmission channel indicated by the first process identity, and a second packet is transmitted from the second codeword using a second transmission channel indicated by the second process identity. In addition, a control message including only the first process identity is transmitted. | 09-06-2012 |
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 |
20120240015 | METHODS AND APPARATUS TO COMPUTE CRC FOR MULTIPLE CODE BLOCKS - A method and a circuit for generating cyclic redundancy checks. The method calculates a plurality of cyclic redundancy checks for a transport block with a plurality of information bits. At least one cyclic redundancy check among the plurality of cyclic redundancy checks is calculated based on a subset of information bits, and at least one information bit among the plurality of information bits is not within said subset of the information bits. In addition, a transport block cyclic redundancy check may be calculated based on all the information bits. | 09-20-2012 |
20120307761 | METHODS AND APPARATUS FOR DOWNLINK PDSCH POWER SETTING - In a communication system, a base station transmits power setting information in a downlink Physical Downlink Shared Channel (PDSCH). A mapping scheme between overhead signals and reference signal (RS) overhead ratios, and the traffic-to-pilot ratios (T2P) calculation methods are established. A user-specific T2P ratio for certain OFDM symbols, a RS overhead ratio and a calculation method selected from the plurality of T2P calculation methods are assigned to a wireless terminal. An overhead signal corresponding to the assigned RS overhead ratio and the assigned T2P calculation method is selected in accordance with the mapping scheme and transmitted to the wireless terminal. In addition, the user-specific traffic-to-pilot ratio is transmitted to the wireless terminal. The wireless terminal calculates the traffic-to-pilot ratios across different transmission antennas and different OFDM symbols based on the received traffic-to-pilot ratio, the RS overhead ratio and the T2P calculation method indicated by the RS overhead signal. | 12-06-2012 |
20130061118 | METHODS AND APPARATUS TO COMPUTE CRC FOR MULTIPLE CODE BLOCKS - A method and a circuit for generating cyclic redundancy checks. The method calculates a plurality of cyclic redundancy checks for a transport block with a plurality of information bits. At least one cyclic redundancy check among the plurality of cyclic redundancy checks is calculated based on a subset of information bits, and at least one information bit among the plurality of information bits is not within said subset of the information bits. In addition, a transport block cyclic redundancy check may be calculated based on all the information bits. | 03-07-2013 |
20130064217 | EFFICIENT UPLINK FEEDBACK IN A WIRELESS COMMUNICATION SYSTEM - A method for transmitting control information by transmitting a reference signal from a first transceiver to a second transceiver, in response to the reception of the reference signal, determining at the second transceiver a plurality of control channel elements based upon the received reference signal, jointly encoding the plurality of control channel elements at the second transceiver to generate a control signal, and transmitting the control signal from the second transceiver to the first transceiver. | 03-14-2013 |
20130145239 | METHODS AND APPARATUS TO IMPROVE PERFORMANCE AND ENABLE FAST DECODING OF TRANSMISSIONS WITH MULTIPLE CODE BLOCKS - A method includes separating resource elements from multiple code blocks into different groups, and decoding the code bits of the resource elements within each group without waiting for a completed reception of a transport block to start decoding. | 06-06-2013 |
20140211635 | METHODS AND APPARATUS FOR CHANNEL QUALITY INDICATION FEEDBACK IN A COMMUNICATION SYSTEM - Methods and apparatus for feeding back channel quality indication in a communication system. First, a first channel quality indication index is determined in dependence upon a channel quality estimation of a first transmission channel, and a second channel quality indication index is determined in dependence upon a channel quality estimation of a second transmission channel. A differential channel quality indication index of the second channel quality indication index is determined with reference to the first channel quality indication index in dependence upon a differential compression scheme. Then, the first channel quality indication index and the differential channel quality indication index are reported. | 07-31-2014 |