Patent application number | Description | Published |
20130044621 | SELF-INTERFERENCE HANDLING IN A WIRELESS COMMUNICATION TERMINAL SUPPORTING CARRIER AGGREGATION - A wireless communication terminal that has the self-interference due to the support of carrier aggregation, aggregating and jointly using two or more component carriers for transmission and reception, performs a first set of measurements on a received signal on a first operating frequency, wherein the first set of measurements are performed during which the wireless terminal transmits or receives signals on a second operating frequency. In an alternative embodiment, the wireless communication terminal changes the maximum transmit power limit on a first operating frequency on a per-slot basis to reduce the impact of harmonic or intermodulation distortion on a received signal at a second operating frequency. | 02-21-2013 |
20130044664 | METHOD AND APPARATUS FOR CONTROL CHANNEL TRANSMISSION AND RECEPTION - A communication system is provided wherein a user equipment (UE) receives control information from a wireless network. The UE monitors control channel candidates using common reference signals (CRS) and monitors enhanced control channel candidates using demodulation reference signals (DMRS) when the UE is configured in a first transmission mode, such as transmission mode 9, for receiving a downlink shared traffic channel based on DMRS. The UE monitors control channel candidates only using CRS when the UE is configured in a second transmission mode, such as any of transmission modes 1-6, for receiving a downlink shared traffic channel based on CRS. The UE then receives downlink control information (DCI) in a subframe in one of the monitored control channel candidates or enhanced control channel candidates in the subframe. | 02-21-2013 |
20130044727 | METHOD AND APPARATUS FOR CONTROL CHANNEL TRANSMISSION AND RECEPTION - A user equipment (UE) receives a signal comprising multiple resource blocks and configured for receiving a subframe comprising multiple time-frequency resources, the time-frequency resources comprising at least two control channel candidates. The UE determines a first control channel candidate of the at least two control channel candidates in the subframe, determines a first antenna port (AP) associated with the first control channel candidate, decodes the first control channel candidate based on the first AP, determines a second control channel candidate of the at least two control channel candidates in the subframe, determines a second AP associated with the second control channel candidate, and decodes the second control channel candidate based on the second AP, wherein the AP used for decoding the first control channel candidate is distinct from the AP used for decoding the second control channel candidate. | 02-21-2013 |
20130215783 | RADIO LINK PERFORMANCE PREDICTION IN WIRELESS COMMUNICATION TERMINAL - A method for predicting performance of a radio link in a wireless communication terminal including hypothesizing a second codeword including information associated with a hypothesized first codeword, obtaining channel state information from a received signal, and estimating a decoder error rate of the first codeword under a condition that the second codeword may not be decoded correctly, wherein the decoder error rate is estimated using the channel state information. | 08-22-2013 |
20130231110 | EFFICIENT RESELECTIONS IN THE PRESENCE OF CLOSED SUBSCRIBER GROUP CELLS - A method in a mobile station for avoiding interference to restricted access cells, including detecting presence of a restricted access cell, determining that a measured path-loss is larger than a path-loss threshold, determining that the mobile station is not allowed to access the restricted access cell, and barring a carrier frequency on which the restricted access cell is deployed when the measured path-loss is larger than the path-loss threshold and when the mobile station is not allowed access to the restricted access cell. | 09-05-2013 |
20130242789 | Signal Measurement on Component Carriers in Wireless Communication Systems - A method in a wireless communication device includes performing measurements of a first serving cell on a first carrier frequency at a first rate, determining whether a signal level of a second serving cell on a second carrier frequency exceeds a threshold, and performing measurements of the first serving cell at a second rate if the signal level of the second serving cell is below the threshold, wherein the second rate is higher than the first rate. | 09-19-2013 |
20130242975 | Radio Link Synchronization in a Wireless Communication Device - A wireless communication terminal including a controller coupled to a transceiver wherein the controller is configured to determine a synchronization based on a mapping of channel state information to decoder error rate corresponding to a hypothetical control code word, to attempt to decode a control codeword in a received signal, and to conclude that an out of synchronization event has not occurred if the control codeword is decoded successfully regardless of an indication of the mapping. | 09-19-2013 |
20130258975 | METHOD AND APPARATUS FOR MITIGATING DOWNLINK CONTROL CHANNEL INTERFERENCE | 10-03-2013 |
20130273905 | Threshold Determination in TDOA-Based Positioning System - A method in a wireless communication terminal including receiving a signal comprising at least a Positioning Reference Signal (PRS) transmission from a serving cell and a PRS transmission from a neighbor cell, estimating a signal quality metric (SQM) based on the PRS transmission from the neighbor cell, estimating a time difference of arrival (TDOA) measurement for the neighbor cell based on the PRS transmissions, determining if the estimated SQM satisfies a criterion, and sending a report to the serving cell that includes at least the estimated TDOA if the criterion is satisfied. | 10-17-2013 |
20130301434 | RADIO LINK MONTORING IN A WIRELESS COMMUNICATION DEVICE - Methods and apparatus' of determining radio link quality are disclosed. According to various implementations, information indicating the time-frequency blocks to be monitored by a UE to enable the UE to locate a control channel is determined. The UE receives configuration information regarding resources used by a channel state information reference signal. It also receives configuration information regarding an interference measurement resource, as well as a channel state information reference signal. The channel state information reference signal uses the channel state information reference signal resources. A synchronization condition is determined based on the time frequency blocks to be monitored by the UE, the received channel state information reference signal and the interference measurement resource. The determined synchronization condition is sent to a higher layer. | 11-14-2013 |
20130301542 | RADIO LINK MONTORING IN A WIRELESS COMMUNICATION DEVICE - Methods and apparatus' of determining radio link quality are disclosed. According to various implementations, a user equipment detects an out-of-synchronization condition corresponding to a first control channel, and monitors a second control channel in response to the detecting the out-of synchronization condition. | 11-14-2013 |
20130308485 | INTERFERENCE MITIGATION IN HETEROGENEOUS WIRELESS COMMUNICATION NETWORKS - A method in a wireless terminal transceiver includes receiving a sequence of frames from a first base station, wherein each frame in the sequence contains a first set of time-frequency resources which may be used for scheduling data and a second set of time-frequency resources not used for scheduling data. The transceiver also receives a message from the first base station identifying a third set of time-frequency resources that is a subset of the first set of time-frequency resources, and estimates the channel state based on the transmission received in the third set of time-frequency resources. | 11-21-2013 |
20130315084 | IQ IMBALANCE IMAGE COMPENSATION IN MULTI-CARRIER WIRELESS COMMUNICATION SYSTEMS - A method in a wireless communication terminal includes receiving an aggregated carrier including a first component carrier and a second component carrier, determining a level of interference from a signal received on the first component carrier to a signal on the second component carrier based on a signal characteristic of the first component carrier and a signal characteristic of the second component carrier, and providing signal interference information to a serving base station if the determined interference level satisfies a condition. | 11-28-2013 |
20130315085 | IQ IMBALANCE IMAGE COMPENSATION IN MULTI-CARRIER WIRELESS COMMUNICATION SYSTEMS - A method in a wireless communication terminal includes receiving an aggregated carrier including a first component carrier and a second component carrier, determining a level of interference from a signal received on the first component carrier to a signal on the second component carrier based on a signal characteristic of the first component carrier and a signal characteristic of the second component carrier, and providing signal interference information to a serving base station if the determined interference level satisfies a condition. | 11-28-2013 |
20130315157 | REDUCING THE EFFECTS OF INTERFERENCE EXPERIENCED BY A COMMUNICATION DEVICE - Disclosed are methods for allowing a wireless communication device (or “user equipment” or “UE”) to receive signaling information when there is a power imbalance between a primary cell (“Pcell”) and a New Carrier Type (“NCT”) secondary cell (“Scell”). In one aspect, the UE reduces its downlink bandwidth to cover only a carrier of the Pcell, receives control signaling information, if present, and then increases its bandwidth to cover carriers of both the Pcell and Scell. | 11-28-2013 |
20130315168 | Method and Apparatus for Generating Reference Signals for Accurate Time-Difference of Arrival Estimation - A base station communicates a positioning reference signal (PRS) to wireless communication devices over a downlink in a wireless communication system by encoding a PRS into a first set of transmission resources, encoding other information into a second set of transmission resources, multiplexing the two sets of resources into a subframe such that the first set of resources is multiplexed into at least a portion of a first set of orthogonal frequency division multiplexed (OFDM) symbols based on an identifier associated with the base station and the second set of resources is multiplexed into a second set of OFDM symbols. Upon receiving the subframe, a wireless communication device determines which set of transmission resources contains the PRS based on the identifier associated with the base station that transmitted the subframe and processes the set of resources containing the PRS to estimate timing (e.g., time of arrival) information. | 11-28-2013 |
20140064109 | METHOD AND APPARATUS FOR MITIGATING DOWNLINK INTERFERENCE - A wireless device transmits downlink interference-related information to a transmission point. The wireless device generates this information by listening to reference signals associated with a first reference signal resource as well as with a second reference signal resource. The wireless device uses these reference signals to estimate a first channel matrix relating to the first reference signal resource and a second channel matrix relating to the second reference signal resource. Using the estimated first and second channel matrices, the wireless device derives a pair of precoding matrices. Precoding matrix indicators representing the precoding matrix pair are sent to the transmission point. | 03-06-2014 |
20140071944 | METHOD AND APPARATUS FOR DISTINGUISHING CELLS WITH THE SAME PHYSICAL CELL IDENTIFIER | 03-13-2014 |
20140126440 | METHOD AND SYSTEM FOR MANAGING TRANSMIT POWER ON A WIRELESS COMMUNICATION NETWORK - The present disclosure sets forth multiple embodiments of the invention. Among those embodiments is a method for determining a maximum power reduction of an uplink signal. The uplink signal is transmitted on a carrier that has a range of frequencies. Frequencies outside of the carrier frequency range include adjacent channel regions. Resource blocks of the carrier that have been allocated for use by to transmit the uplink signal are identified. A power spectral density is determined based on the identified resource blocks. A metric that is based on a third order convolution of the power spectral density function is determined. A maximum power reduction for the adjacent channel regions is also determined based on the metric. | 05-08-2014 |
20140133462 | METHOD AND APPARATUS FOR DISTINGUISHING CELLS WITH THE SAME PHYSICAL CELL IDENTIFIER | 05-15-2014 |
20140177683 | METHOD AND APPARATUS FOR ANTENNA ARRAY CHANNEL FEEDBACK - A method and apparatus provide antenna array channel feedback. The method can include receiving, at a wireless terminal, a set of channel state information reference signals. The method can include determining, by the wireless terminal, based on the received set of channel state information reference signals, a precoding matrix that is a product of a first precoding matrix and a second precoding matrix. The first precoding matrix can have at least a representation in terms of a representation matrix. The representation matrix can be based on a matrix selected from a first codebook. The second precoding matrix can be based on a second codebook. The method can include transmitting, by the wireless terminal, a representation of at least one of the first precoding matrix and the second precoding matrix. | 06-26-2014 |
20140177744 | METHOD AND APPARATUS FOR ANTENNA ARRAY CHANNEL FEEDBACK - A method and apparatus provide antenna array channel feedback. The method can include receiving, at a wireless terminal, a set of channel state information reference signals. The method can include determining a precoding matrix based on the received set of channel state information reference signals. The precoding matrix can have a representation in terms of three components. The first component of the three components can be determined from a first set of vectors. The second component of the three components can be determined from a first set of parameters. The third component of the three components can be determined from a second set of parameters. The second set of parameters can be a set of unit-magnitude scalars. The method can include transmitting, by the wireless terminal, a representation of at least one of the first component, the second component, and the third component. | 06-26-2014 |
20140177745 | METHOD AND APPARATUS FOR ANTENNA ARRAY CHANNEL FEEDBACK - A method and apparatus provide antenna array channel feedback. The method can include receiving a first set of channel state information reference signals on resource elements, and a second set of channel state information reference signals on resource elements. The method can include determining a first precoding matrix based on the received first set of channel state information reference signals. The first precoding matrix can be chosen from a first codebook. The method can include determining a second precoding matrix based on the second set of channel state information reference signals. The second precoding matrix can be chosen from a second codebook that is different than the first codebook. The method can include transmitting a representation of at least one of the first precoding matrix and the second precoding matrix. | 06-26-2014 |
20140254508 | METHOD FOR CODEBOOK ENHANCEMENT FOR MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT SYSTEMS - A wireless terminal is capable of receiving a pilot signal from a base station; and determining a precoding matrix as a linear combination of two matrices V | 09-11-2014 |
20140302855 | Methods and Devices for Cell Discovery - This disclosure sets forth methods and devices for communication between mobile devices and base stations with active and dormant states. In an embodiment, a base station transmits system information during an active state of the base station with at least one system-information message. The at least one system-information message includes a SystemInformationBlockType1 (“SIB1”) message with a first update-indicator field. The base station selects an update value that indicates whether the system information has changed since a previous transmission of a previous SIB1 message. The base station transmits at least one dormant-state message during a dormant state of the base station with the selected update value in a second update-indicator field of the at least one dormant-state message. | 10-09-2014 |
20140302856 | Methods and Devices for Cell Discovery - This disclosure sets forth methods and devices for communication between mobile devices and base stations with active and dormant states. In an embodiment, a base station transmits system information during an active state of the base station with at least one system-information message. The at least one system-information message includes a SystemInformationBlockType1 (“SIB1”) message with a first update-indicator field. The base station selects an update value that indicates whether the system information has changed since a previous transmission of a previous SIB1 message. The base station transmits at least one dormant-state message during a dormant state of the base station with the selected update value in a second update-indicator field of the at least one dormant-state message. | 10-09-2014 |
20140362938 | METHODS FOR CODEBOOK SUB-SAMPLING - Disclosed are methods for codebook sub-sampling. In various implementations, a wireless terminal receives a reference signal, determines, based on the reference signal, a first precoding index i | 12-11-2014 |
20150029995 | INTERFERENCE MITIGATION IN HETEROGENEOUS WIRELESS COMMUNICATION NETWORKS - A method in a wireless terminal transceiver includes receiving a sequence of frames from a first base station, wherein each frame in the sequence contains a first set of time-frequency resources which may be used for scheduling data and a second set of time-frequency resources not used for scheduling data. The transceiver also receives a message from the first base station identifying a third set of time-frequency resources that is a subset of the first set of time-frequency resources, and estimates the channel state based on the transmission received in the third set of time-frequency resources. | 01-29-2015 |
20150030092 | METHODS AND A DEVICE FOR MULTI-RESOLUTION PRECODING MATRIX INDICATOR FEEDBACK - Disclosed are methods and a device for Multi-resolution PMI Feedback. In one implementation, a user equipment finds a rank 1 or rank 2 Precoding Matrix Indicator based on the signal channel matrix and interference covariance matrix, defines an error vector, obtains an orthonormal basis for the projection matrix, finds the (M−1)-dimensional vector from a codebook (e.g., oversampled Discrete Fourier Transform) with the minimum Euclidean distance, and sends a feedback representing to the base station regarding the vector that it found in the codebook. | 01-29-2015 |