Patent application number | Description | Published |
20080267271 | METHOD AND APPARATUS FOR CLOSED LOOP TRANSMISSION - In a wireless communication system, a method and apparatus for closed loop transmission is disclosed. In accordance with the preferred embodiment of the present invention, a time frequency portion of an uplink frame is dynamically reserved as a sounding zone for uplink channel sounding. A first message is transmitted to a first subscriber station in a downlink frame assigning a time-frequency resource within the sounding zone, and a sounding waveform. Furthermore, a signal is received from the subscriber station within the assigned time-frequency resource, a partial channel response is determined from the received sounding signal, and the subsequent transmission to the subscriber station is tailored based on the at least partial channel response. | 10-30-2008 |
20080273490 | METHOD AND SYSTEM FOR LINK ADAPTATION USING METRIC FEEDBACK - A method for link adaptation at a base station using metric feedback is disclosed. The method can include the steps of communicating with a mobile station over a communication link having one or more sub-channels and during the communication, receiving from the mobile station information relating to one or more mutual information per coded bit metrics for one or more candidate modulation types. The mutual information per coded bit metrics can be based on channel state knowledge of the sub-channels. Also, based on the received information, the operational performance of the mobile station can be predicted in view of one or more transmission parameters and performance factors and one or more of the transmission parameters can be selected based on a transmission condition of the communication link. | 11-06-2008 |
20080273494 | METHOD AND APPARATUS FOR CLOSED LOOP TRANSMISSION - In a wireless communication system, a method and apparatus for closed loop transmission is disclosed. In accordance with the preferred embodiment of the present invention, a time frequency portion of an uplink frame is dynamically reserved as a sounding zone for uplink channel sounding. A first message is transmitted to a first subscriber station in a downlink frame assigning a time-frequency resource within the sounding zone, and a sounding waveform. Furthermore, a signal is received from the subscriber station within the assigned time-frequency resource, a partial channel response is determined from the received sounding signal, and the subsequent transmission to the subscriber station is tailored based on the at least partial channel response. | 11-06-2008 |
20080310353 | Method and Apparatus to Facilitate Use of Default Transmitter-Receiver Configurations - A wireless communications system base station ( | 12-18-2008 |
20090067377 | MEDIUM ACCESS CONTROL FRAME STRUCTURE IN WIRELESS COMMUNICATION SYSTEM - A wireless communication infrastructure entity configured to allocate radio resources, in a radio frame, to a wireless terminal compliant with a first protocol and to a wireless terminal compliant with a second protocol. The radio frame including a first protocol resource region and a second protocol resource region. The radio frame including a first protocol allocation control message that allocates resources within the first protocol resource region to the wireless terminal compliant with the first protocol, and a second protocol allocation control message that allocates resources within the second protocol resource region to the wireless terminal compliant with the second protocol. | 03-12-2009 |
20090092067 | FLEXIBLE FRAME STRUCTURE IN WIRELESS COMMUNICATION SYSTEM - The disclosure relates to a frame structure that can be flexibly configured to serve to half-duplex users or a mixture of half- and full-duplex users based upon the grouping of user terminals according to one or more criteria. The disclosure also relates to the switching of users from one group to another. The signaling mechanisms to reconfigure a frame and to switch users are provided. | 04-09-2009 |
20090092178 | Techniques for Estimating Received Signal Strength and Carrier to Interference and Noise Ratio in OFDM Systems - A technique for determining a received signal strength indicator of a target base station at a subscriber station includes performing a discrete Fourier transform on a received signal to provide a transformed signal. In this case, the transformed signal occupies one or more segments of a channel and the one or more segments each include multiple subcarriers. A shift-n cross-correlation is calculated based on the transformed signal and a preamble sequence of the target base station to provide a coarse received signal strength indicator for the target base station. | 04-09-2009 |
20090122884 | CLOSED-LOOP TRANSMISSION FEEDBACK IN WIRELESS COMMUNICATION SYSTEMS - A method in an OFDM wireless user terminal that communicates with a base unit is disclosed. The method comprises computing a transmit spatial covariance matrix, transforming the spatial covariance matrix, and transmitting the transformed spatial covariance matrix to a base unit. | 05-14-2009 |
20090196164 | METHOD AND APPARATUS FOR CLOSED LOOP TRANSMISSION - In a wireless communication system, a method and apparatus for closed loop transmission is disclosed. In accordance with the preferred embodiment of the present invention, a time frequency portion of an uplink frame is dynamically reserved as a sounding zone for uplink channel sounding. A first message is transmitted to a first subscriber station in a downlink frame assigning a time-frequency resource within the sounding zone, and a sounding waveform. Furthermore, a signal is received from the subscriber station within the assigned time-frequency resource, a partial channel response is determined from the received sounding signal, and the subsequent transmission to the subscriber station is tailored based on the at least partial channel response. | 08-06-2009 |
20090219841 | METHOD FOR SUPPORTING FLEXIBLE FRAME STRUCTURES IN WIRELESS COMMUNICATION SYSTEMS - A wireless communication base station including a transceiver coupled to a controller configured to cause the base station to serve a plurality of user terminals in a series of downlink radio frames each having a first temporal region and a second temporal region. The controller is configured to assign the plurality of user terminals to first and second groups, wherein the user terminals in the first group are served in the first temporal region of the downlink radio frame and the user terminals in the second group are served in the second temporal region of the downlink radio frame. The controller is also configured to change a duration of either of the first and second temporal regions of at least one downlink radio frame in the series of downlink radio frames, wherein a downlink radio frame contains an indicator signaling a change of duration of either of the first or second temporal regions of at least one downlink radio frame in the series of downlink radio frames. | 09-03-2009 |
20090225721 | HIERARCHICAL PILOT STRUCTURE IN WIRELESS COMMUNICATION SYSTEMS - A method for communicating control channel information in a wireless communication system, including transmitting a super-frame having a time-frequency resource region containing an allocation control channel and multiple pilot elements, at least some of which are associated with the allocation control channel, and indicating, in a configuration information control channel of the super-frame, a characteristic of the pilots elements associated with the allocation control channel. | 09-10-2009 |
20090280747 | Method and Apparatus for Interference Cancellation in a Wireless Communication System - A mobile device estimates a data symbol from a received signal by using one or more interference cancellation algorithms. For one interference cancellation algorithm, the mobile device calculates a correction factor by estimating a Doppler speed and a time difference between a first time interval like a preamble symbol and a second time interval like any symbol of interest in an assigned data allocation in the data zone. Using the correction factor, the mobile device updates outdated interference information. The mobile device cancels interference in the received signal distorted by co-channel interference by using the updated interference information. Also, the mobile device is configured to combine results of multiple interference cancellation algorithms based on the applicability of the individual interference cancellation algorithms in particular scenarios. | 11-12-2009 |
20100034299 | MAPPING AND SIGNALING OF COMMON REFERENCE SYMBOLS FOR MULTIPLE ANTENNAS - A method, a network base station, and a user communication device for transmitting data on an orthogonal frequency-division multiplexing carrier are disclosed. An antenna array may transmit a signal decodable by a legacy user communication device designed for compatibility with a legacy set of transmission antennas. A processor | 02-11-2010 |
20100103810 | MODULATION CODING SCHEME SELECTION IN A WIRELESS COMMUNICATION SYSTEM - A base station and method for selecting a modulation coding scheme (MCS) in an OFDM communication system, includes a first step | 04-29-2010 |
20100110964 | Method for Relays within Wireless Communication Systems - A relay design backward compatible with existing wireless communication networks. The invention provides details of apparatus and methods to enable operation of inband relays. Using a grant-based inhibit mechanism, a Relay and an eNB can efficiently cooperate to improve the performance by allowing one of either UE or the Relay to transmit on the uplink. Similarly, the UE overrides any pre-determined schedule (i.e., absence of Reference Signals) by searching for a scheduling grant and if the UE find the scheduling grant, the UE can assume that the Relay has overridden the pre-determined schedule temporarily. | 05-06-2010 |
20100118989 | EMPLOYING CELL-SPECIFIC AND USER ENTITY-SPECIFIC REFERENCE SYMBOLS IN AN ORTHOGONAL FREQUENCY-DIVISION MULTIPLE ACCESS - A method, a network base station, and a user communication device for transmitting data on an orthogonal frequency-division multiple access carrier are disclosed. A network base station | 05-13-2010 |
20100120442 | RESOURCE SHARING IN RELAY OPERATIONS WITHIN WIRELESS COMMUNICATION SYSTEMS - A wireless communication relay terminal including a controller coupled to a transceiver wherein the controller is configured to cause the transceiver to transmit a first portion of a first sub-frame during a first time-frequency region to a wireless communication device, to cause the transceiver to receive, from a base station, a portion of a second sub-frame during a second time-frequency region wherein the first and second time-frequency regions are non-overlapping The controller is also configured to detect a control region within the portion of the second sub-frame received by attempting to decode information in a possible control region of the second sub-frame having at least one of several possible starting locations that are known a priori by the terminal. | 05-13-2010 |
20100195566 | APPARATUS AND METHOD FOR COMMUNICATING AND PROCESSING A POSITIONING REFERENCE SIGNAL BASED ON IDENTIFIER ASSOCIATED WITH A BASE STATION - 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, and transmitting the subframe. Upon receiving the subframe, a wireless 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. | 08-05-2010 |
20100195583 | Physical Layer Acknowledgement Signaling Resource Allocation in Wireless Communication Systems - A downlink subframe on a single downlink carrier supports physical layer acknowledgment signaling for multiple physical uplink shared channel (PUSCH) transmissions. The physical layer acknowledgement signaling may take the form of physical hybrid ARQ indicator channel (PHICH) signaling. A base unit reserves resource elements groups (REGs) for default PHICH signaling of default PUSCH transmissions. The base unit reserves control channel elements (CCEs) for physical downlink control channel (PDCCH) signaling. A CCE contains multiple interleaved REGs. The base unit takes any unreserved CCEs and maps those CCEs for physical layer acknowledgement signaling of additional PUSCH transmissions. | 08-05-2010 |
20100232373 | Resource Allocation in Wireless Communication Systems - A wireless communication terminal including a controller coupled to a wireless transceiver wherein the transceiver is configured to receive a first control message on an anchor carrier, the first control message including a resource assignment for the anchor carrier. The transceiver is also configured to receive a second control message on the anchor carrier, the second control message associated with a set of component carriers, the set of component carriers are distinct from the anchor carrier. The controller determines a resource assignment for at least one component carrier in the set of component carriers using both the first and the second control messages. | 09-16-2010 |
20100238845 | Relay Operation in a Wireless Communication System - A method in a relay node operating in a time division duplex system wherein the relay node transmits downlink pilot timeslot information to a user terminal in a first temporal region of a special sub-frame, communicates with a base station during a second temporal region of the special sub-frame, the second temporal region is configured as a guard period for communications between the relay node and the user terminal, and configures a third temporal region of the special sub-frame. | 09-23-2010 |
20100238984 | Spatial Information Feedback in Wireless Communication Systems - A wireless communication unit and method therein including generating a transmission waveform based on a mapping of at least one directly-modulated sequence to a set of radio resource elements, wherein the directly-modulated sequence is a product of at least one transmitted coefficient and a corresponding base sequence and the transmitted coefficient is based on a first channel corresponding to a first transmit antenna and a second channel corresponding to a second transmit antenna, and transmitting the transmission waveform from a transceiver of the wireless communication unit. | 09-23-2010 |
20100260154 | 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. | 10-14-2010 |
20100272032 | METHOD OF SIGNALING PARTICULAR TYPES OF RESOURCE ELEMENTS IN A WIRELESS COMMUNICATION SYSTEM - A method of signaling particular types of resource elements in a wireless communication system is disclosed. The method can include, at a wireless terminal, receiving ( | 10-28-2010 |
20100279621 | METHOD FOR MULTI-ANTENNA UPLINK TRANSMISSION | 11-04-2010 |
20100317343 | Interference Control, SINR Optimization and Signaling Enhancements to Improve the Performance of OTDOA Measurements - A wireless terminal receives signaling information, pertaining to a reference signal transmission in at least one specifically designated sub frame, the signaling information including a list, the list including base station identities. The terminal determines, from at least one of the base station identities in the list, the time-frequency resources associated with a reference signal transmission intended for observed time difference of arrival (OTDOA) measurements from a transmitting base station associated with said one base station identity. The time of arrival of a transmission from the transmitting base station, relative to reference timing, is measured. The wireless terminal can receive a command from a serving cell to start performing inter-frequency OTDOA measurement on a frequency layer containing reference signals, the frequency layer distinct from the serving frequency layer, the serving frequency layer not containing positioning reference signals. The wireless terminal can perform OTDOA measurements subsequent to the reception of the command on a carrier frequency different from the serving cell carrier frequency. A base station transmitter can jointly schedule a reference signal transmission from a plurality of base station transmitters for the purpose of OTD estimation enhancement, and transmit identical reference signals from the plurality of base station transmitters, the reference signals being identical both in the signal sequence and time-frequency resources used for transmission. | 12-16-2010 |
20110085588 | METHOD FOR PRECODING BASED ON ANTENNA GROUPING - A method an apparatus for performing uplink transmission in a user device with a plurality of transmit antennas, including transmitting a first data stream from a first subset of the antennas according to a first precoding vector wherein the first precoding vector may be any vector in a precoding codebook, and transmitting a second data stream from a second subset of the antennas according to a second precoding vector wherein any vector in the precoding codebook may be used for the second precoding vector when the second precoding vector is the same as the first precoding vector to within a scaling factor. | 04-14-2011 |
20110085610 | Configurable Spatial Channel Information Feedback in Wireless Communication System - A method for configurable spatial channel information feedback in wireless communication systems is disclosed including receiving, at the wireless communication device, transmission from a plurality of antennas, receiving an indication of a feedback mode for feeding back spatial channel information that is based on correlations among at least some of the plurality of antennas, decomposing a correlation matrix representative of the correlations among at least some of the plurality of antennas into at least two Kronecker components, and feeding back parameters representative of the Kronecker components according to the feedback mode indicated. | 04-14-2011 |
20110085618 | METHOD FOR SEMI-STATICALLY ADAPTING UPLINK MULTIPLE-INPUT MULTIPLE-OUTPUT TRANSMISSION - A method, a wireless terminal device, and a base station are disclosed. A receiving unit | 04-14-2011 |
20110149868 | APPARATUS AND METHOD FOR COMMUNICATING AND PROCESSING A REFERENCE SIGNAL BASED ON AN IDENTIFIER ASSOCIATED WITH A BASE STATION - A wireless communication device receives at least a section of a subframe from a base station in a wireless communication system. The subframe includes transmission resources multiplexed onto subcarriers of orthogonal frequency division multiplexed (OFDM) symbols. A first set of OFDM symbols includes a reference signal and at least a second set of OFDM symbols includes information other than the reference signal (e.g., channel-coded data). The wireless device determines which OFDM symbols of the subframe constitute the first set of OFDM symbols based on an identifier associated with a base station that transmitted the subframe. The wireless device may then process the reference signal from the OFDM symbols that are determined to be the first set of OFDM symbols. The wireless device may also determine which OFDM symbols of the subframe constitute the second set of OFDM symbols and process non-reference signal information from OFDM symbols of the second set. | 06-23-2011 |
20110149903 | APPARATUS AND METHOD FOR COMMUNICATING AND PROCESSING A REFERENCE SIGNAL BASED ON AN IDENTIFIER ASSOCIATED WITH A BASE STATION - A base station, which includes a processor and a transmitter, communicates a reference signal to wireless communication devices in a wireless communication system. The processor encodes the reference signal into a first set of transmission resources, encodes other information into a second set of transmission resources, and multiplexes the two sets of transmission resources into a subframe, such that the first set of transmission 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 transmission resources is multiplexed into a second set of OFDM symbols. The transmitter transmits the subframe to the wireless devices. According to one embodiment, transmission resources for carrying the reference signal may be allocated according to a predetermined allocation, a semi-static allocation, a dynamic allocation, and/or an allocation based on higher layer signaling. | 06-23-2011 |
20110274059 | MULTIPLEXING CONTROL AND DATA ON MULTILAYER UPLINK TRANSMISSIONS - The present disclosure relates to resource allocation in multi-layer transmissions in transmissions of user data and control information. A wireless terminal allocates resources in a multi-layer transmission for one more types of control information based on scheduling information and control allocation parameters. The multi-layer transmission includes control information and one or more user data streams that are mapped to multiple transmission layers and transmitted by the wireless terminal. | 11-10-2011 |
20110274188 | METHOD AND PRECODER INFORMATION FEEDBACK IN MULTI-ANTENNA WIRELESS COMMUNICATION SYSTEMS - A method for two component feedback in wireless communication systems is disclosed, with a wireless communication device sending a first representation of a first matrix chosen from a first codebook, wherein the first matrix has at least two columns, the wireless communication device sending a second representation of a second matrix chosen from a second codebook, and the base station obtaining a precoder from the first representation and the second representation. | 11-10-2011 |
20110317542 | Method and Apparatus for Diversity Transmission Scheme in Single-Carrier FDMA Systems - The disclosure relates to transmission of user data over multiple transmission layers in a wireless communication system with single-carrier orthogonal frequency division multiple access. A wireless terminal performs transform precoding on a vector of digital modulation symbols and the resulting complex-valued symbols are mapped to frequency/time/space resources. The digital modulation symbols are reordered, modified by a setting of complex-valued functions, and transform precoded. The resulting second set of complex-valued symbols are transform precoded and mapped to frequency/time/space resources. | 12-29-2011 |
20110319027 | METHOD FOR CHANNEL QUALITY FEEDBACK IN WIRELESS COMMUNICATION SYSTEMS - A method for channel quality feedback in a wireless communication device that receives precoding information of at least one potentially co-scheduled wireless communication device that is potentially assigned a time frequency resource that is also assigned to the wireless communication device. The wireless communication device determines a channel quality metric based on the received precoding information and an assumption that the wireless communication device and the at least one potentially co-scheduled wireless communication device are assigned the same time frequency resource, and then feeds back the channel quality metric. | 12-29-2011 |
20120039251 | METHOD OF CODEBOOK DESIGN AND PRECODER FEEDBACK IN WIRELESS COMMUNICATION SYSTEMS - A method for two component feedback in wireless communication systems wherein a wireless communication device sends a first representation of a first matrix chosen from a first codebook, the first matrix is a N-by-N diagonal matrix with the k-th diagonal elements being σ1*exp(jπ(k−1)m/N), for k from 1 to N/2 and being σ2*exp(jπ(k−N/2−1)m/N) for k from N/2+1 to N, N is a number of antennas, m is an integer between 0 and N−1, and σ1, σ2 are complex valued scalars. The device also sends a second representation of a second N-by-R matrix chosen from a second codebook, with R being a number of spatial layers wherein the first and second representations together convey a precoder matrix as the matrix product of the first and second matrices. | 02-16-2012 |
20120057585 | Method and System for Link Adaptation Using Metric Feedback - A method for link adaptation at a base station using metric feedback is disclosed. The method can include the steps of communicating with a mobile station over a communication link having one or more sub-channels and during the communication, receiving from the mobile station a plurality of mutual information per coded bit metrics for a plurality of candidate modulation types per coding layer. The mutual information per coded bit metrics can be based on channel state knowledge of the sub-channels. Also, based on the received information, the operational performance of the mobile station can be predicted in view of one or more transmission parameters and performance factors and one or more of the transmission parameters, including a modulation type selected from one of the plurality of candidate modulation types per coding layer, can be selected based on a transmission condition of the communication link. | 03-08-2012 |
20120087424 | Uplink Precoding For Retransmission Without Explicit Precoding Instruction - A method in a wireless communication device includes receiving precoding matrix information including first and second precoding submatrices, transmitting a first transport block from a first set of at least two antennas according to the first precoding submatrix and a second transport block from a second set of at least two antennas according to the second precoding submatrix, receiving a retransmission request for the second transport block, and retransmitting the second transport block according to a retransmission precoding matrix from at least one of the first set of antennas and at least one of the second set of antennas. | 04-12-2012 |
20120163305 | ENERGY-SAVING BASE STATION AND METHOD - A wireless communication user terminal obtains uplink access configuration information on a physical downlink control channel (PDCCH) addressed to a plurality of user terminals by processing the PDCCH based on a first system information received from a base station on a physical broadcast channel (PBCH) and based on synchronization information. The terminal sends a signature waveform based on the uplink access configuration information, prior to receiving system information in addition to the first system information, whereby the signature waveform enables the base station to transition from a relatively low power operating mode to a relatively high power operating mode. | 06-28-2012 |
20120195397 | CHANNEL ESTIMATOR WITH HIGH NOISE SUPPRESSION AND LOW INTERPOLATION ERROR FOR OFDM SYSTEMS - A receiver with DFT based channel estimation having good noise suppression for both high and low signal-to-noise ratios providing advantages over conventional DFT estimators and Minimum-Mean-Square-Error (MMSE) estimators. The use of MMSE may be incorporated for estimation at the band edges providing further improvements. The received signal in the time domain, is transformed to the frequency-domain received signal via an N-point FFT ( | 08-02-2012 |
20120213261 | METHOD AND APPARATUS FOR REFERENCE SIGNAL PROCESSING IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING COMMUNICATION SYSTEM - A wireless communication includes a base station that configures a set of non-zero power reference signals corresponding to multiple potential transmission points to one or more users equipment UEs and configures at least one zero-power reference signal, with zero transmission power from one or more of the multiple transmission points. The base station transmits configuration information to at least one UE of the one more UEs, wherein the configuration information corresponds to a set of resource elements that are associated with a set of channel state information reference signals and wherein the set of channel state information reference signals include the set of nonzero-power reference signals and the at least one zero-power reference signal. The UE then performs a channel measurement based on one or more non-zero-power reference signals of the set of non-zero-power reference signals and performs an interference measurement based on the at least one zero-power reference signal. | 08-23-2012 |
20120243501 | Method and Apparatus for Closed Loop Transmission - In a wireless communication system, a method and apparatus for closed loop transmission is disclosed. In accordance with the preferred embodiment of the present invention, a time frequency portion of an uplink frame is dynamically reserved as a sounding zone for uplink channel sounding. A first message is transmitted to a first subscriber station in a downlink frame assigning a time-frequency resource within the sounding zone, and a sounding waveform. Furthermore, a signal is received from the subscriber station within the assigned time-frequency resource, a partial channel response is determined from the received sounding signal, and the subsequent transmission to the subscriber station is tailored based on the at least partial channel response. | 09-27-2012 |
20120281556 | MULTI-CELL COORDINATED TRANSMISSIONS IN WIRELESS COMMUNICATION NETWORK - A method is described for fast coordinated transmissions in a multi-point system, which involves a UE receiving known pilot signals sent from a set of transmission antennas and determining, based on the known pilot signals from the set of transmission antennas, a recommended first subset of transmission antennas from which transmissions are not intended for the wireless communication device, and a recommended second subset of transmission antennas from which transmissions are intended for the wireless communication device. The UE also determines a recommended transmission power setting of each of the first subset of transmission antennas; sending information to the base station, wherein the information pertains to the recommended first and second subsets of transmission antennas and the recommended transmission power setting of each of the first subset of transmission antennas. | 11-08-2012 |
20120327980 | Method of Signaling Particular Types of Resource Elements in a Wireless Communication System - A wireless communication terminal including a transceiver coupled to a processor and corresponding methods are disclosed. The processor is configured to determine resource elements that carry data intended for the terminal from a set of allocated resource elements that carry data intended for the terminal excluding at least resource elements associated with a first set of one or more resource elements of a particular type that are shifted relative to a known reference signal pattern. The processor is also configured to decode the resource elements that carry the data intended for the terminal based on the resource elements that carry the data intended for the terminal. | 12-27-2012 |
20120327981 | Method of Signaling Particular Types of Resource Elements in a Wireless Communication System - A wireless communication terminal including a processor coupled to a transceiver and corresponding methods are disclosed. The transceiver is configured to receive information of a set of allocated resource elements carrying data intended for the terminal and information of a set of zero power reference signal configurations where each zero power reference signal configuration corresponds to one or more resource elements devoid of signal transmission from one or more cells. The processor is configured to derive resource elements that carry data intended for the terminal excluding at least the resource elements associated with each of the zero power reference signal configurations and to decode resource elements that carry data intended for the terminal based on deriving the resource elements that carry the data intended for the terminal. | 12-27-2012 |
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 |
20130250880 | Method For Search Space Configuration of Enhanced Physical Downlink Control Channel - A method to allocate physical radio resources for both distributed and localized transmission schemes of ePDCCH and configure common and UE-specific search space for UE is provided. In one embodiment, a UE receives a first high-layer information to determine a first set of PRBs. The UE determines a first set of candidate ePDCCHs within the first set of PRBs, wherein one or more candidate ePDCCHs potentially carries DCI intended for the UE. The UE then decodes the first set of candidate ePDCCHs to obtain the DCI intended for the UE. Similar steps are performed for a second set of candidate ePDCCHs potentially carrying DCI intended for the UE. The allocated radio resources of the candidate ePDCCHs may be distributed or localized and constitute either common or UE-specific search space. Blind decoding complexity is reduced. | 09-26-2013 |
20130286980 | Physical Structure and Reference Signal Utilization of Enhanced Physical Downlink Control Channel for OFDM/OFDMA Systems - A two-level physical structure is defined for better diversity for both distributed and localized transmission in enhanced physical downlink control channel (ePDCCH). First level is a physical unit of enhanced resource element groups (eREGs), where the group of REs is predefined for each eREG. Second level is a logical unit of enhanced control channel elements (eCCEs), where the group of eREGs is predefined or configurable by higher layer for each eCCE. For distributed transmission of ePDCCH, eCCE consists of several eREGs that are distributed in multiple non-contiguous PRBs spreading over the whole channel frequency. Downlink control information (DCI) is transmitted on a number of aggregated eCCEs according to the modulation and coding level required. The utilization reference signals of antenna ports for ePDCCH demodulation is based on the logical order of eCCEs and the aggregation level for DCI transmission. | 10-31-2013 |
20130301562 | Methods for Resource Multiplexing of Distributed and Localized transmission in Enhanced Physical Downlink Control Channel - A method to multiplexing physical radio resources for both distributed and localized transmission of enhanced Physical Downlink Control Channel (ePDCCH) in a set of physical resource blocks (PRBs) is provided. A UE receives higher-layer information to determine a set of radio resources. The UE decodes a first set of candidate enhanced physical downlink control channel (ePDCCHs) within the set of received radio resources, wherein radio resources corresponding to each of the first set of ePDCCHs are defined by a first mapping rule (e.g., distributed-type ePDCCH). The UE decodes a second set of candidate ePDCCHs within the same set of received radio resources, wherein radio resources corresponding to each of the second set of candidate ePDCCHs are defined by a second mapping rule (e.g., localized-type ePDCCH). By multiplexing radio resources for distributed and localized ePDCCH transmission within the same set of PRBs, radio resource utilization is enhanced. | 11-14-2013 |
20140146696 | UE Measurement Enhancement in Adaptive TDD Configuration Networks - Methods for UE measurement enhancement in an adaptive TDD configuration network are proposed. In a first solution, the network provides an adaptive TDD indicator to the UE. In a second solution, the network provides an instantaneous TDD configuration to the UE. In a third solution, multiple TDD configurations are grouped as one TDD group, and the network adapts TDD configurations within the same TDD group. In a fourth solution, the network broadcasts a TDD reference configuration in SIB1, and adapts to another TDD configuration with DL super set constraint, i.e., the DL subframes of the other TDD configuration form a super set of the DL subframes of the broadcasted TDD reference configuration. | 05-29-2014 |
20140153522 | Method and System for Link Adaptation at a Mobile Station - A method for link adaptation at a mobile station ( | 06-05-2014 |
20140204783 | System and Methods of Dynamic TDD Configurations - Solutions to support the coexistence of legacy UEs and new released UEs in adaptive TDD systems are proposed. Methods of TDD grouping, RACH (random access channel) resource allocation, and DL/UL data transmission and HARQ (Hybrid Automatic Repeat Request) process to serve legacy UEs without interfering the operation of new released UEs are proposed. With the methods proposed in this invention, both the legacy UEs and the new released UEs can be served in the adaptive TDD systems and the data transmission from the legacy UEs would not interfere the data reception of the new released UEs. | 07-24-2014 |
20140376652 | METHOD AND PRECODER INFORMATION FEEDBACK IN MULTI-ANTENNA WIRELESS COMMUNICATION SYSTEMS - A method for two component feedback in wireless communication systems is disclosed, with a wireless communication device sending a first representation of a first matrix chosen from a first codebook, wherein the first matrix has at least two columns, the wireless communication device sending a second representation of a second matrix chosen from a second codebook, and the base station obtaining a precoder from the first representation and the second representation. | 12-25-2014 |
20150049829 | CONFIGURABLE SPATIAL CHANNEL INFORMATION FEEDBACK IN WIRELESS COMMUNICATION SYSTEM - A method for configurable spatial channel information feedback in wireless communication systems is disclosed including receiving, at the wireless communication device, transmission from a plurality of antennas, receiving an indication of a feedback mode for feeding back spatial channel information that is based on correlations among at least some of the plurality of antennas, decomposing a correlation matrix representative of the correlations among at least some of the plurality of antennas into at least two Kronecker components, and feeding back parameters representative of the Kronecker components according to the feedback mode indicated. | 02-19-2015 |