Patent application number | Description | Published |
20120042022 | METHODS AND SYSTEMS FOR ANALYSIS OF REAL-TIME USER-GENERATED TEXT MESSAGES - The present invention generally relates to methods and systems for analysis of real-time user-generated text messages. The methods and systems allow analysis to be performed using term associations and geographical and temporal constraints. | 02-16-2012 |
20130054511 | DATA ENRICHMENT USING HETEROGENEOUS SOURCES - A data enrichment system may include an attribute relevance module to measure relevance of an attribute to a data object to be enriched. The data object may include the attribute including a known or an unknown value. An output value confidence module may calculate a confidence of an output value of a source used for enrichment of the data object. The output value may represent the known and/or unknown values of the attribute. The system may use the measured relevance of the attribute and the calculated confidence of the output value to determine assignment of the known or unknown values to the attribute. | 02-28-2013 |
20130205023 | SYSTEM AND METHOD FOR DETERMINING AND OPTIMIZING RESOURCES OF DATA PROCESSING SYSTEM UTILIZED BY A SERVICE REQUEST - A computer-implemented method for determining resources utilized by a service request in a data processing system. The method includes determining monitored relationship types from monitoring data, determining relationship domains, determining intra-domain relationships from relationships that are internal to the relationship domains and determining cross-domain relationships from the intra-domain relationships that are linked between pairs of the relationship domains, and determining resources utilized by the service request from the intra-domain and cross-domain relationships. The domains are derived from one of the relationship types that is monitored by a single monitoring application. | 08-08-2013 |
20150088836 | DATA ENRICHMENT USING HETEROGENEOUS SOURCES - A data enrichment system may include an attribute relevance module to measure relevance of an attribute to a data object to be enriched. The data object may include the attribute including a known or an unknown value. An output value confidence module may calculate a confidence of an output value of a source used for enrichment of the data object. The output value may represent the known and/or unknown values of the attribute. The system may use the measured relevance of the attribute and the calculated confidence of the output value to determine assignment of the known or unknown values to the attribute. | 03-26-2015 |
Patent application number | Description | Published |
20140247778 | Adaptive Reference Signal Mapping in Wireless Multi-Access Communication Networks - Embodiments provide systems and methods for adaptive reference signal mapping in wireless multi-access communication networks, including LTE, WLAN, WiMAX, Bluetooth, etc. In an embodiment, the reference signal mapping configuration is user equipment (UE) specific and can be configured semi-statically or dynamically according to one or more communication related parameters of the UE. The one or more parameters can include, without limitation, a modulation scheme used for communication with the UE, a modulation and coding scheme (MCS) used for communication with the UE, a distance of the UE relative to the base station, an antenna configuration at the UE, interference management capability of the UE, and a rank of the UE. | 09-04-2014 |
20140314166 | Adaptive Signaling and Feedback for Multi-User Multiple input Multiple output (MU-MIMO) - Embodiments recognize that Multi-User Multiple Input Multiple Output (MU-MIMO) performance can be greatly enhanced if additional parameters are provided to the User Equipment (UE) during link adaptation and/or data demodulation. Recognizing the overhead that such signaling entails, embodiments provide MU-MIMO enhancement solutions that identify and signal only those parameters that can result in a large gain improvement when known at the UE. In an embodiment, the signaling rate of information can be adapted to channel and deployment conditions. In another embodiment, different parameters, which can vary according to different time scales, are signaled at different rates to the UE. | 10-23-2014 |
20140362941 | Codebook Subsampling for Multi-Antenna Transmit Precoder Codebook - Embodiments provide approaches for sub-sampling a two-component precoder codebook to reduce the overhead associated with signaling the codebook in periodic Channel Stale Information (CSI) reports from a user equipment (UE) to a base station. In one embodiment, a first component of the codebook is sub-sampled to accommodate a payload capacity of a Physical Uplink Control Channel (PUCCH) CSI Report of Type 1. In another embodiment, both the first component and the second component of the codebook are sub-sampled to accommodate a maximum payload capacity associated with a PUCCH CSI report. | 12-11-2014 |
Patent application number | Description | Published |
20090075686 | METHOD AND APPARATUS FOR WIDEBAND TRANSMISSION BASED ON MULTI-USER MIMO AND TWO-WAY TRAINING - A method, apparatus and system is disclosed herein for wireless transmission based on MU-MIMO and two-way training. In one embodiment, the system comprises a set of K receivers and at least one transmitter having a set of N transmit antennas, where the transmitter is operable to precode a signal for downlink transmission to each receiver in the set of K receivers based on multi-user MIMO using precoding derived based on two-way channel training between the set of K receivers and the set of N transmit antennas | 03-19-2009 |
20100074358 | Sparse Channel Estimation for MIMO OFDM Systems - A method for sparse channel estimation in MIMO OFDM systems with a plurality of subchannels having the same sparsity structure is presented. The inventive method comprises initializing a plurality of residual vectors and observation generating matrices modeling the channel, sending a pilot signal for each subcarrier, converting the pilot signals to tap positions, detecting an optimal tap position, updating the residual vectors by removing the one residual vector having the optimal tap position, updating the generating matrices in accordance with the optimal residual vector, calculating weighted residuals based on the updated residual vectors, and repeating the steps, except initializing, until a stopping condition is met, wherein the updated observation matrices estimate the sparse channel. In one embodiment, the observation generating matrices are omitted. In one embodiment, multiple vectors are removed during one iteration. Pilot placement and pilot allocation techniques are presented to optimize the method. | 03-25-2010 |
Patent application number | Description | Published |
20120250550 | CHANNEL FEEDBACK FOR COOPERATIVE MULTIPOINT TRANSMISSION - A method includes receiving in a mobile communication terminal downlink signals from at least first and second cells that coordinate transmission of the downlink signals with one another. Channel feedback is calculated in the terminal based on the received downlink signals. The channel feedback is configured to cause the first cell to precode subsequent downlink signals in response to the channel feedback with a first precoding vector, and to cause the second cell to precode the subsequent downlink signals in response to the channel feedback with a second precoding vector that differs in magnitude from the first precoding vector. The channel feedback is transmitted from the terminal. | 10-04-2012 |
20130114654 | PRECODING FEEDBACK FOR CROSS-POLARIZED ANTENNAS WITH MAGNITUDE INFORMATION - A method includes receiving in a mobile communication terminal a precoded Multiple-Input Multiple-Output (MIMO) signal, which includes first and second signal components transmitted at respective different first and second polarizations. A difference between respective signal magnitudes of the first and second signal components received in the terminal is estimated in the terminal. Feedback information, which includes at least an indication of the difference between the signal magnitudes, is calculated and transmitted from the terminal. | 05-09-2013 |
20130114655 | CODEBOOK SUB-SAMPLING FOR FREQUENCY-SELECTIVE PRECODING FEEDBACK - A method includes, in a mobile communication terminal, holding a definition of a sub-sampled codebook identifying precoding matrices, which are selected from a master codebook that is made-up of a wideband codebook and a frequency-selective codebook. The definition defines a first subset of the wideband codebook and a second subset of the frequency-selective codebook. The second subset of the frequency-selective codebook is represented using no more than two bits. A Multiple-Input Multiple-Output (MIMO) signal is received in the terminal. Based on the received MIMO signal, one or more precoding matrices are selected from the sub-sampled codebook for precoding subsequent MIMO signals transmitted to the terminal, and precoding feedback indicating the selected precoding matrices is calculated. The precoding feedback is transmitted from the terminal. | 05-09-2013 |
20130122953 | DIFFERENTIAL CQI ENCODING FOR COOPERATIVE MULTIPOINT FEEDBACK - A method includes receiving in a mobile communication terminal signals from multiple cells that coordinate transmission of the signals with one another in a Cooperative Multipoint (CoMP) scheme. At least first and second Channel Quality Indicators (CQIs), for respective communication channels over which the signals are received, are calculated in the terminal based on the received signals. The second CQI is differentially encoded relative to the first CQI. Feedback information, including the first CQI and the differentially-encoded second CQI, is transmitted from the terminal. | 05-16-2013 |
20130155921 | ENHANCED DEMODULATION REFERENCE SIGNAL (DM-RS) DESIGN - A method in a mobile communication terminal includes receiving a Multi-User Multiple-Input Multiple-Output (MU-MIMO) signal, which includes at least a precoded transmission that is addressed to the terminal and which includes one or more Demodulation Reference Signals (DM-RS). Control information, which indicates one or more scrambling sequences and one or more orthogonalization sequences used in producing the DM-RS, is received in the mobile communication terminal. The control information is provided in a format that does not permit signaling of every possible scrambling sequence and orthogonalization sequence selection. The control information is interpreted in the mobile communication terminal so as to identify the scrambling sequences and orthogonalization sequences used in producing the DM-RS, and the DM-RS are demodulated using the identified scrambling sequences and orthogonalization sequences. | 06-20-2013 |
20130156001 | REFERENCE SIGNAL DESIGN FOR COORDINATED MULTIPOINT TRANSMISSION - A method includes controlling a set of transmission points, which are configured to operate in accordance with a Coordinated Multipoint (CoMP) transmission scheme, to simultaneously transmit a composite Reference Signal (RS) to a mobile communication terminal. Feedback, which is indicative of a response of a composite communication channel between the transmission points and the terminal, is received from the terminal. The feedback is estimated in the terminal based on the composite RS received in the terminal from the transmission points. Subsequent transmission from the transmission points is configured based on the received feedback. | 06-20-2013 |
20140286452 | CODEBOOK SUBSAMPLING FOR PUCCH FEEDBACK - A method in a mobile communication terminal includes holding a definition of a sub-sampled codebook identifying precoding matrices to be used for providing precoding feedback by the terminal The precoding matrices in the sub-sampled codebook are selected from a master codebook that is made-up of a long-term sub-codebook and a short-term sub-codebook. The definition defines a first subset of the long-term sub-codebook and a second subset of the short-term sub-codebook. A Multiple-Input Multiple-Output (MIMO) signal is received in the terminal via multiple receive antennas. Based on the received MIMO signal, a precoding matrix is selected from the sub-sampled codebook for precoding subsequent MIMO signals transmitted to the terminal. The precoding feedback indicating the selected precoding matrix is calculated. | 09-25-2014 |
Patent application number | Description | Published |
20100172424 | EFFICIENT MIMO TRANSMISSION SCHEMES - A method for communication includes, in a transmitter having a first number of transmit antenna ports, setting an upper limit on a second number of spatial layers to be used by the transmitter to be less than the first number. An actual number of the spatial layers, which does not exceed the upper limit, is allocated for transmission to a given receiver. One or more streams of modulated symbols are mapped onto the allocated actual number of the spatial layers. The actual number of the spatial layers are transmitted from the transmitter to the given receiver. | 07-08-2010 |
20100232553 | MULTI - USER MULTIPLE INPUT MULTIPLE OUTPUT (MU - MIMO) RECEIVER - Some of the embodiments of the present disclosure provide a method within a wireless communication network, the method comprising, receiving by a user equipment (UE), a signal and interference component, wherein the interference component was transmitted in an unknown direction; and decoding, by the UE, the signal based at least in part on the interference component. Other embodiments are also described and claimed. | 09-16-2010 |
20100254474 | Feedback Strategies for Multi-User MIMO Communication Systems - A method for signal processing in a receiver includes receiving in the receiver a Multi-User Multiple-Input Multiple-Output (MU-MIMO) signal. The MU-MIMO signal includes at least a first signal, which is precoded using a first precoding scheme and is addressed to the receiver, and a second signal, which is precoded using a second precoding scheme. An average error rate achievable in decoding the first signal in the presence of the second signal is computed. The average error rate is computed over a set of possible choices of the second precoding scheme. The first precoding scheme is selected from among a plurality of available precoding schemes so as to satisfy a criterion defined over the average error rate. The receiver sends feedback to a transmitter transmitting the first signal. The feedback depends on the selected first precoding scheme and causes the transmitter to control transmission of the first signal. | 10-07-2010 |
20110110450 | ASYMMETRICAL FEEDBACK FOR COORDINATED TRANSMISSION SYSTEMS - A method includes, in a mobile communication terminal, receiving from at least first and second base stations, which cooperate in a coordinated transmission scheme, signals that are transmitted over respective first and second communication channels. Respective channel measures are calculated for the communication channels based on the received signals. First and second feedback data, which are indicative of the respective channel measures of the first and second communication channels, are formulated such that the first feedback data has a first data size and the second feedback data has a second data size, different from the first data size. The first and second feedback data are transmitted from the mobile communication terminal to at least one of the base stations. | 05-12-2011 |
20110150052 | MIMO FEEDBACK SCHEMES FOR CROSS-POLARIZED ANTENNAS - A method includes receiving a Multiple-Input Multiple Output (MIMO) signal over multiple communication channels from an antenna array including a first set of antennas having a first polarization and a second set of the antennas having a second polarization that is orthogonal to the first polarization. First feedback information is calculated relating to first interrelations between the antennas within either the first set or the second set. Second feedback information is calculated relating at least to second interrelations between the first set and the second set of the antennas. The first feedback information is transmitted at a first time/frequency granularity, and the second feedback information is transmitted at a second time/frequency granularity that is finer than the first time/frequency granularity. | 06-23-2011 |
20120087425 | CODEBOOK SUBSAMPLING FOR PUCCH FEEDBACK - A method in a mobile communication terminal includes holding a definition of a sub-sampled codebook identifying precoding matrices to be used for providing precoding feedback by the terminal The precoding matrices in the sub-sampled codebook are selected from a master codebook that is made-up of a long-term sub-codebook and a short-term sub-codebook. The definition defines a first subset of the long-term sub-codebook and a second subset of the short-term sub-codebook. A Multiple-Input Multiple-Output (MIMO) signal is received in the terminal via multiple receive antennas. Based on the received MIMO signal, a precoding matrix is selected from the sub-sampled codebook for precoding subsequent MIMO signals transmitted to the terminal. The precoding feedback indicating the selected precoding matrix is calculated. | 04-12-2012 |
20120087435 | ENHANCED CHANNEL FEEDBACK FOR MULTI-USER MIMO - A method includes receiving in a mobile communication terminal over a communication channel a Multiple-Input Multiple-Output (MIMO) signal that includes at least a transmission addressed to the terminal. A Multi-User Signal to Noise Ratio (MU-SNR) is estimated in the terminal based on the received signal. The MU-SNR is indicative of a power ratio between the transmission addressed to the terminal and remaining components of the signal, which are assumed to include one or more transmissions addressed to one or more other terminals. Feedback, which is indicative of the communication channel and is based on the MU-SNR, is transmitted from the terminal. | 04-12-2012 |
20130059596 | ASYMMETRICAL FEEDBACK FOR COORDINATED TRANSMISSION SYSTEMS - A method includes, in a mobile communication terminal, receiving from at least first and second base stations, which cooperate in a coordinated transmission scheme, signals that are transmitted over respective first and second communication channels. Respective channel measures are calculated for the communication channels based on the received signals. First and second feedback data, which are indicative of the respective channel measures of the first and second communication channels, are formulated such that the first feedback data has a first data size and the second feedback data has a second data size, different from the first data size. The first and second feedback data are transmitted from the mobile communication terminal to at least one of the base stations. | 03-07-2013 |
Patent application number | Description | Published |
20130156123 | EFFICIENT MIMO TRANSMISSION SCHEMES - A method for communication includes, in a transmitter having a first number of transmit antenna ports, setting an upper limit on a second number of spatial layers to be used by the transmitter to be less than the first number. An actual number of the spatial layers, which does not exceed the upper limit, is allocated for transmission to a given receiver. One or more streams of modulated symbols are mapped onto the allocated actual number of the spatial layers. The actual number of the spatial layers are transmitted from the transmitter to the given receiver. | 06-20-2013 |
20130223365 | CROSS-LAYER SCHEDULING BASED ON LOWER LAYER FEEDBACK - Systems, methods, apparatus, and techniques are provided for retransmitting packets of data. A Radio Link Control (RLC) layer data packet is generated, and the RLC layer data packet is converted to one or more physical (PHY) layer data packets. The one or more PHY layer data packets are transmitted. At least one of a hybrid automatic transmission request (HARQ) acknowledgement (ACK) message and a HARQ negative acknowledgment (NACK) message is received from a receiver in response to transmission of the one or more PHY layer data packets. It is determined whether the at least one of the HARQ ACK message and the HARQ NACK message represents a automatic transmission request (ARQ) ACK message or a ARQ NACK message. | 08-29-2013 |
20130266100 | Method And Apparatus For Jointly Performing Channel Estimation And Interference Estimation In A Wireless Communication System - Systems and methods for estimating characteristics of a channel are provided. A transmission of known reference data is received at a receiving device. The reference data is transmitted over the channel that includes one or more desired layers and one or more interfering layers. Characteristics of the channel are determined based on the known reference data, where the determining includes a joint estimation of the one or more desired layers and the one or more interfering layers. The determining includes selecting certain of the layers to be estimated at each of the known reference data and selecting certain of the layers to be estimated over a range of the known reference data. The determining includes solving an equation to jointly estimate the one or more desired layers and the one or more interfering layers based on the selections. The selections reduce a number of unknown values in the equation. | 10-10-2013 |
20130288730 | METHOD AND SYSTEM FOR COORDINATED MULTIPOINT (CoMP) COMMUNICATION BETWEEN BASE-STATIONS AND MOBILE COMMUNICATION TERMINALS - A method includes receiving, at a communication terminal, signals from a group of cells that cooperate in a Coordinated Multipoint (CoMP) transmission scheme. Signaling that specifies a CoMP resource management (CRM) set is received at the communication terminal. The CRM set includes a subset of the cells in the group for which the communication terminal is to perform signal measurements. A size of the CRM set is restricted to a predefined maximum size. The signal measurements are performed at the communication terminal only on the signals received from one or more of the cells in the CRM set. The signal measurements performed on the one or more of the cells in the CRM set are reported from the communication terminal. | 10-31-2013 |
20130301447 | Method and System for Reporting Feedback in Cooperative Multipoint Transmission - A method includes receiving, in a communication terminal, signals from a group of cells. The group of cells cooperates in a Coordinated Multipoint (CoMP) transmission scheme that assigns multiple Channel State Information Reference Signals (CSI-RS) resources to the cells. A first subset of the CSI-RS resources is assigned to periodically report channel feedback on a first uplink channel, and a second subset of the CSI-RS resources is assigned to a-periodically report the channel feedback on a second uplink channel. The channel feedback is computed for the multiple CSI-RS resources. The channel feedback computed for the CSI-RS resources is transmitted in the first subset on the first uplink channel, and the channel feedback computed for the CSI-RS resources in the second subset is transmitted on the second uplink channel. | 11-14-2013 |
20140003266 | CALCULATING AND REPORTING CHANNEL CHARACTERISTICS | 01-02-2014 |
20140093004 | SYSTEMS AND METHODS FOR ESTABLISHING TRANSMISSION FORMAT PARAMETERS BETWEEN COMMUNICATION DEVICES - Systems and methods for establishing transmission format parameters between communication devices are provided. In some aspects, a method includes identifying, by a first base station, a first communication session with a first user equipment. A master set of transmission format parameters is shared between the first base station and the first user equipment. The method also includes assigning a first subset of the master set of transmission format parameters to the first communication session. The first subset is specifically assigned to the first communication session and specifies which of the master set of transmission format parameters is allocated for use in the first communication session. The method also includes transmitting an indicator of the first subset to the first user equipment. | 04-03-2014 |
20140153510 | Interference Management in Wireless Multi-Access Communication Networks - Embodiments provide systems and methods for interference management in wireless multi-access communication networks, and more particularly systems and methods to enable reduction and/or suppression of interference. Embodiments for interference reduction include, without limitation, systems and methods to enable interference alignment, interference avoidance, and/or joint transmission to a user equipment (UE). Embodiments for enabling suppression of interference include, without limitation, systems and methods for feedback (from a UE to a network) or feedforward (from the network to the UE) signaling to enable interference estimation at the network/UE. | 06-05-2014 |
20140185476 | Efficient Link Adaptation for Non-Collocated Antennas - Systems and methods for efficient link adaptation in multi-access wireless communication networks, including link adaptation in scenarios with non-collocated and/or power imbalanced base station transmit antennas are provided. In an embodiment, an indication of signal powers of the transmit antennas is signaled by the network to the user equipment (UE) when the UE is configured for logical antenna. ports using non-collocated and/or power imbalanced transmit antennas. The UE can use the indication of signal powers in determining the Precoding Matrix Indicator (PMI) and the Channel Quality Indicator (CQI), resulting in higher accuracy link adaptation. | 07-03-2014 |
20140192916 | Communication System Using a Multi-Antenna Transmit Precoder Codebook - Systems using a transmit precoder codebook designed for a four-transmitter (4Tx) antenna configuration are described. The 4Tx antenna configuration is an attractive option for base stations in cellular network environments due to site-acquiring advantages and robust performance. In an embodiment, the transmit precoder codebook can be used for a variety of transmit antenna configurations and has a high resolution to enable beamforming and/or nulling. In another embodiment, the transmit precoder codebook is a two-component codebook, with a first precoder component signaled at a first frequency and a second precoder component signaled at a second higher frequency. | 07-10-2014 |