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500 results about "Channel state information feedback" patented technology
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Techniques for channel state information feedback in wireless communication system
ActiveUS20100271968A1Site diversityReceivers monitoringCommunications systemChannel state information feedback
Methods for a User Equipment (UE) to transmit Channel Quality Index (CQI) feedback information, and an indicator in feedback information, to an evolved Node B (eNB) in a wireless communication system, and apparatuses therefore, are provided. A method for a UE to transmit CQI feedback information to eNB in a wireless communication system, includes obtaining one or more Transmission Points Configurations for Coordinated MultiPoint (CoMP) (TPCCs), each TPCC including a unique combination of one or more cells in a CoMP measurement set, estimating a channel for one or more cells in the CoMP measurement set, computing a CQI for each of at least one of the one or more TPCCs, each CQI being computed using one or more estimated channels that correspond to the combination of one or more cells included in a corresponding TPCC, generating CQI feedback information based on the one or more CQIs, and transmitting the CQI feedback information.
Owner:SAMSUNG ELECTRONICS CO LTD
Channel state information feedback method for multi-carrier communication system
InactiveUS20050232156A1Improve efficiencyImprove reverse efficiencyFrequency-division multiplex detailsTransmission path divisionCommunications systemTransfer mode
In a multi-carrier communication system where a base station performs resource allocating power allocation and adaptive modulation processes for a mobile station by using CSI (Channel State Information) received from the mobile station, a CSI feedback method in accordance with the present invention determines a CSI transmission mode according to an amount of data traffic on a reverse link, encodes CSI for subcarriers into one CSI codeword according to the determined CSI transmission mode, and transmits the CSI codeword to the base station. Since the CSI is adaptively transmitted according to the amount of the data traffic of the reverse link, it can effectively use resources of the reverse link.
Owner:SAMSUNG ELECTRONICS CO LTD
Channel state information feedback apparatus and method in wireless communication system operating in fdd mode
ActiveUS20130163457A1Efficient receptionFeedback information efficientlyError preventionTransmission systemsCommunications systemMobile station
A Channel State Information (CSI) feedback method and apparatus is provided for transmitting, at a base station, the CSIs for plural transmit antennas with a limited amount resource and receiving, at a mobile station, the CSIs efficiently in a massive Multiple Input Multiple Output (MIMO) system operating in the Frequency Division Duplex (FDD) mode.
Owner:SAMSUNG ELECTRONICS CO LTD +1
Method for feeding back channel state information, user device and base station
InactiveCN102684850AError prevention/detection by using return channelWireless communicationEngineeringChannel state information feedback
The invention provides a method for feeding back channel state information (CSI), comprising the following steps of: receiving a CSI reference signal CSI-RS (CSI-Reference Signal) measurement set configuration signaling from a base station, and the CSI-RS measurement set configuration signaling comprising indications which aim at a CSI-RS measurement set configured by a user device; measuring the CSI-RS in the CSI-RS measurement set according to the indications of the CSI-RS measurement set to obtain metrics corresponding to the format of the CSI-RS in the CSI-RS measurement set; obtaining a CSI-RS report set which is selected from the CSI-RS measurement set according to the metrics; determining a CSI feedback resource corresponding to the format of the CSI-RS in the CSI-RS report set; and using the determined CSI feedback resource to feed back the CSI corresponding to the format of the CSI-RS in the CSI-RS report set to the base station. As well, the invention also provides the corresponding user device and the base station.
Owner:SHARP KK
Method for improved performance and reduced bandwidth channel state information feedback in communication systems
ActiveUS7433661B2Reduce throughputUse amountSubstation equipmentTransmission monitoringCommunications systemTime segment
A method of transmitting information over a feed back channel of a communication system that has multiple antenna systems is provided. Long term channel condition information is obtained from received measured and / or calculated channel parameter values. The obtained long term channel condition information is arranged in a particular manner and transmitted over a defined time period during which the long term channel condition information varies relatively slowly. Because the long term information remains relatively constant for one or more defined time periods, the amount of bandwidth needed to communicate this value is small because it need only be communicated occasionally. Thus only a small bandwidth needs to be allocated for transmitting this long term information.
Owner:ALCATEL-LUCENT USA INC
Method and apparatus for determining instruction signaling of channel measurement pilot frequency, and channel state information feedback method and apparatus
ActiveCN104038312ASave resourcesReduce sending overheadError prevention/detection by using return channelConnection managementControl signalChannel state information feedback
Disclosed are a determination method and device for the instruction signaling of a channel measurement pilot frequency and a CSI feedback method and device. The determination method for the instruction signaling of a channel measurement pilot frequency comprises: a base station sends to a terminal a downlink control signaling comprising the transmission resource configuration information of a non-periodic channel state information reference signal (CSI-RS), said information being used to determine the position of the non-periodic CSI-RS, and the non-periodic CSI-RS being used to instruct the terminal to perform channel measurement. The present invention determines the non-periodic CSI-RS using the transmission resource configuration information of the non-periodic CSI-RS, and uses the non-periodic CSI-RS to perform channel measurement, thereby solving the problem in the prior art that periodic CSI-RS transmissions have high cost and waste resources, conserving resources, and reducing transmission costs.
Owner:ZTE CORP
Method and system for an improved user group selection scheme with finite-rate channel state information feedback for FDD multiuser MIMO downlink transmission
InactiveUS7630337B2Frequency-division multiplex detailsSubstation equipmentCommunications systemEngineering
Certain embodiments of the invention may be found in a method and system for an improved user group selection scheme with finite-rate channel state information feedback for frequency division duplex (FDD) multiuser multiple-input-multiple-output (MIMO) downlink transmission. Aspects of the method may include selecting, from a plurality of users in a FDD multiuser communication system, a first user having a channel gain that is greater than a channel gain corresponding to a remaining portion of the plurality of users. A second user may be selected from the remaining portion of the plurality of users, based on a channel gain of the second user and orthogonality of the second user's channel direction with respect to the first user. The selected second user may have a channel gain that is greater than a channel gain corresponding to the remaining portion of the plurality of users.
Owner:AVAGO TECH INT SALES PTE LTD
Method and system for realizing down link self adaption in multiple users multiple input and multiple output system
InactiveCN1946000AExcellent featuresExcellent powerSpatial transmit diversityMulti-frequency code systemsFrequency spectrumChannel state information feedback
This invention relates to a method and a system for realizing adaptive down-link in the multi-user multi-in / out system including the following steps: UE measure the channel state of a down-link and feeds it to the base station, which distributes sub-carriers to the UE based on the state information and informs the distribution result to the corresponding UE, which estimates the channel quality of the down channel based on the sub-carrier and feeds back the information to the base station, which selects corresponding emission antennas and modulates each selected antenna adaptively and selects the code mode to distribute and control the emission power.
Owner:ZTE CORP
Antenna time offset in multiple-input-multiple-output and coordinated multipoint transmissions
ActiveUS20130083780A1Site diversityReceivers monitoringChannel state information feedbackMultiple input
A method for wireless communication is provided which includes receiving first and second signals transmitted from first and second antennas, respectively, determining a time offset between the first and second antennas based on the first and second signals, and reporting information regarding the time offset, including information regarding the time offset as being above or below a predetermined threshold. Another method for wireless communication is provided which includes generating channel state information feedback based on an assumption that the time offset is being compensated at a transmitter side. Yet another method for wireless communication is provided which includes receiving information regarding a time offset between multiple transmit antennas, including information regarding the time offset as being above or below a predetermined threshold, and adapting downlink transmissions to account for the time offset.
Owner:QUALCOMM INC
Channel state information feedback triggering and feedback method and device
ActiveCN102281128AError prevention/detection by using return channelSignalling characterisationChannel state information feedbackBase station
The present invention relates to the technical field of wireless communications. Disclosed in an embodiment of the present invention are a channel state information (CSI) feedback trigger, feedback method and device for enabling a terminal to conduct non-periodic CSI feedback in an expanded non-periodic CSI feedback mode supporting COMP transmission. In the present invention, a base station determines the expanded non-periodic CSI feedback mode adopted by the terminal to conduct the non-periodic CSI feedback, and notifies the terminal the determined feedback mode via signaling; the base station triggers the terminal via signaling to conduct the non-periodic CSI feedback in the expanded non-periodic CSI feedback mode; and the terminal conducts the non-periodic CSI feedback in the expanded non-periodic CSI feedback mode. The present invention enables the terminal to conduct the non-periodic CSI feedback in the expanded non-periodic CSI feedback mode.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Rank-specific feedback for improved MIMO support
ActiveUS20130301560A1Improve performanceReduce needReceivers monitoringRadio transmissionTransfer modeEngineering
A method, an apparatus, and a computer program product for wireless communication are provided in which downlink transmission modes in a wireless network are semi-statically configured for a mobile terminal in multiple-input multiple-output (MIMO) operation. The apparatus provides multiple precoding matrix indicators (PMIs) for a plurality of ranks. The provision of multiple PMIs by the apparatus enables balanced performance among different ranks and avoids less than optimal performance observed when the apparatus provides only a single rank and PMI that are generally not optimal for all transmissions. Feedback configuration information received by an apparatus defines a plurality of channel state information feedback instances conditioned on an admissible rank value. Rank indicators (RIs) and PMIs corresponding to the feedback instances are determined and feedback is provided for the channel state information feedback instances.
Owner:QUALCOMM INC
Non-codebook based channel state information feedback
ActiveUS20140086285A1Radio transmissionDuplex signal operationPrecodingChannel state information feedback
The specification and drawings present a new method, apparatus and software related product for using non-codebook based CSI feedback (e.g., in LTE wireless systems) using selection by a UE of one or more of the plurality of logical antenna ports based on a predefined procedure (e.g., SNR or SINR measurement), but without selecting any codeword (precoder) by the UE. This allows not to involve any standardization of codebooks for precoding due to reliance on an alternative CSI feedback framework which does not rely on standardized codebooks. The exemplary embodiments described herein aim at development of 3GPP LTE Release-12.
Owner:HMD GLOBAL
Method and system for an improved user group selection scheme with finite-rate channel state information feedback for FDD multiuser MIMO downlink transmission
InactiveUS20070064632A1Frequency-division multiplex detailsSubstation equipmentEngineeringChannel state information feedback
Certain embodiments of the invention may be found in a method and system for an improved user group selection scheme with finite-rate channel state information feedback for frequency division duplex (FDD) multiuser multiple-input-multiple-output (MIMO) downlink transmission. Aspects of the method may include selecting, from a plurality of users in a FDD multiuser communication system, a first user having a channel gain that is greater than a channel gain corresponding to a remaining portion of the plurality of users. A second user may be selected from the remaining portion of the plurality of users, based on a channel gain of the second user and orthogonality of the second user's channel direction with respect to the first user. The selected second user may have a channel gain that is greater than a channel gain corresponding to the remaining portion of the plurality of users.
Owner:AVAGO TECH INT SALES PTE LTD
Method and terminal for feeding back channel state information
ActiveUS20130064128A1High precisionImprove system performanceFrequency-division multiplex detailsTransmission systemsChannel state informationMimo transmission
The present invention discloses method and terminal for feeding back channel state information. The method comprises: UE determining channel state information comprising first-type PMI and / or second-type PMI according to indication information, wherein first-type PMI is used for indicating index of one first precoding matrix in first precoding codebook, each first precoding matrix is used for mapping channel information of one wideband and / or long-term channel; second-type PMI is used for indicating index of one second precoding matrix in second precoding codebook, each second precoding matrix is used for mapping channel information of one subband and / or short-term channel; UE feeding back first-type PMI in PUCCH periodically and feeding back second-type PMI in PUSCH periodically or non-periodically, or, feeding back first-type PMI and second-type PMI in PUCCH. Through the present invention, precision of feeding back channel state information by UE is increased, and base station can dynamically select SU-MIMO or MU-MIMO transmission.
Owner:ZTE CORP
Feedback Methodology for Per-User Elevation MIMO
InactiveUS20150078472A1Spatial transmit diversityError prevention/detection by diversity receptionEngineeringChannel state information feedback
A method includes receiving downlink reference signals from a transmit antenna array having of rows of azimuth antenna elements and columns of elevation antenna elements; computing first channel state information feedback components assuming azimuth-only adaptation; computing second channel state information feedback components assuming elevation-only adaptation; computing third channel state information feedback components assuming elevation-adaptation and elevation adaptation; and feeding back the first, second and third channel state information feedback components.
Owner:NOKIA SOLUTIONS & NETWORKS OY
Method and system for a simplified user group selection scheme with finite-rate channel state information feedback for FDD multiuser MIMO downlink transmission
InactiveUS20070064829A1Power managementDiversity/multi-antenna systemsEngineeringChannel state information feedback
Certain embodiments of the invention may be found in a method and system for a simplified user group selection scheme with finite-rate channel state information feedback for frequency division duplex (FDD) multiuser multiple-input-multiple-output (MIMO) downlink transmission. Aspects of the method may include selecting, from a plurality of users, a first user having a channel gain that is greater than a channel gain corresponding to a remaining portion of the plurality of users. At least a second user may be selected from a portion of the remaining portion of the plurality of users. The selected at least the second user has a channel direction that may be approximately orthogonal to that of the first user. The channel gain may be defined by a quantized channel gain. A quantized channel direction of the selected first user may be determined for the selecting the at least the second user.
Owner:AVAGO TECH INT SALES PTE LTD
Feedback method and device
ActiveCN101931989AReduce overheadImprove spectral efficiencySite diversitySpatial transmit diversityState of artFrequency spectrum
The invention discloses a feedback method and a device in a coordinated multiple point (CoMP) transmission system. The embodiment of the invention adopts corresponding feedback modes which are set based on different transmission modes or member carriers, and configures different measurement sets for a terminal according to the different feedback modes, so that after the feedback mode is determined, the terminal can determine the corresponding measurement sets according to the feedback mode and feed the channel state information measured by the measurement set back to a base station, thereby avoiding the problem in the prior art that no matter which feedback mode is configured for the terminal, the terminal needs to take the same cell sets as measurement objects so as to feed all or partial measured channel state information back to the base station. Compared with the prior art, the invention has the advantages of greatly reducing feedback signaling expenses and being favor for improving the frequency spectrum efficiency of the system.
Owner:HUAWEI TECH CO LTD
Method and equipment for generating codebook and sending and feeding back information
ActiveCN102122983AHigh quantitative accuracyMinor changesSpatial transmit diversityBaseband systemsChannel state information feedbackComputer science
The invention discloses a method and equipment for generating a codebook and sending and feeding back information. The method for sending the information comprises the following steps: after the codebook is generated, receiving signals containing codebook index information and extracting the codebook index information; according to the codebook index information, selecting corresponding precoding matrixes from the codebook or subsets of the codebook; precoding data to be sent according to the precoding matrixes; and sending the precoded signals to a receiving end. The method of feeding back channel status information comprises the following steps: receiving information sent by a sending end; estimating channel information on the basis of the received information; selecting the corresponding precoding matrixes from the codebook or the subsets of the codebook according to the channel information,; and sending signals containing codebook index information corresponding to the selected precoding matrixes. By the invention, dual-precoding matrix index feedback can be supported, the quantization accuracy of small-interval dual-polarization array channels can be improved, and the quantization accuracy of small-interval linear array channels can be enhanced.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Method and system for greedy user group selection with range reduction for FDD multiuser MIMO downlink transmission with finite-rate channel state information feedback
InactiveUS7515878B2Error preventionSubstation equipmentSystem capacityChannel state information feedback
Aspects of a greedy search user group selection scheme with range reduction for FDD multiuser MIMO downlink transmission with finite-rate channel state information feedback are provided. The method may comprise receiving feedback information via a communication channel for a plurality of users in a frequency division duplex system. The system capacity may be maximized using the feedback information based on a signal from a single user within a reduced search range or based on the signal from the single user and at least one other signal from another user within a remaining portion of the search range. The feedback information may comprise quantized gain and / or direction of the channel state information of the users.
Owner:AVAGO TECH INT SALES PTE LTD
Channel information feedback method and device in mobile communication system
ActiveCN104184537AAvoid pollutionReduce computational complexityError prevention/detection by using return channelSpatial transmit diversityPrecodingMulti input
The invention proposes a method for channel state information feedback of a large-scale multi-input-multi-output (MIMO) system. In one embodiment, the method includes the following steps: a piece of UE detects a plurality of downlink reference signal ports and feeds back indexes of part of reference signal ports which are better in channel quality so as to assist in uplink reception precoding operations. Through use of the method and device, a problem of CSI feedback in a Massive MIMO system is solved and through support of uplink reception precoding, a problem of pilot-frequency pollution is prevented and moreover, a calculation complexity needed by uplink channel estimation is reduced significantly and at the same time, compatability with an existing system is maintained to the largest degree.
Owner:SHANGHAI LANGBO COMM TECH CO LTD
Method and system for spatial channel state information feedback based on a kronecker product
ActiveUS20110170638A1Accurate spatial CSI feedbackReduce Feedback OverheadAmplitude-modulated carrier systemsRadio transmissionEngineeringChannel state information feedback
A spatial channel state information (CSI) feedback technique is incorporated into multiple-input multiple-output mobile communications technologies. Spatial channel state information is measured at receiving equipment and then decomposed into components. The components are then quantized using codebook(s) and fed back as multiple indices to transmitting equipment.
Owner:ZTE CORP +1
Channel state information transmission method and device
The invention discloses a channel state information transmission method and a channel state information transmission device. The method comprises that: user equipment determines channel state information based on a channel estimation value; and the user equipment feeds the channel state information back by utilizing a cyclic reporting mode supporting coordinated multiple point (CoMP) transmission. By the method and the device, channel state information feedback supporting the CoMP transmission can be realized.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Configuration method of channel state information, feedback method of channel state information, base station and terminal
ActiveCN103391124AReduce the probability of collisionReduce uplink feedback overheadSpatial transmit diversityWireless communicationEngineeringChannel state information feedback
The invention provides a configuration method of channel state information, a feedback method of the channel state information, a base station and a terminal. The feedback method of the channel state information includes the steps that a terminal side receives a configuration instruction sent by a base station side, and the terminal side feeds back an RI and / or a precoding type indicator, a precoding matrix indicator and a channel quality indicator to the channel state information of a plurality of non-zero-power channel state information reference signal resources configurated with the same interference measurement resources according to the configuration instruction, wherein the RI and the PTI are same, and the PMI and the CQI are independent. According to the technical scheme, the same RI and / or the PTI are fed back to the channel state information of the non-zero-power CSI-RSs configurated with the same IMRs, the rules for uplink feedback are simplified and unified while uplink feedback expenditure is greatly reduced, and the collision probability of uplink channel state information feedback is reduced.
Owner:ZTE CORP
Channel state information feedback device, method thereof, and base station
ActiveUS20130028068A1Radio transmissionOrthogonal multiplexChannel state information feedbackMultiple input
Owner:PANTECH CORP
Channel status information feeding back method and wireless transmitting/receiving device
InactiveCN101340219AEasy to handleSave storage spaceSpatial transmit diversityChannel coding adaptationWireless transceiverChannel state information feedback
The invention relates to the wireless communication field and discloses a state information feedback method of channels and a wireless transceiver; in the invention, at least two codebooks generated according to different rules are used. A receiving end is used for selecting a pre-coding matrix combination that is most suitable for the present states of the channels and sending the pre-coding matrix combination with limited bit to a sending end, therefore, the pre-coding treating performance can be improved without adding the amount of feedback information, and storing space needed for storing the codebooks can be saved. A main codebook and an assistant codebook can be used; the assistant codebook can be regarded as a disturbance added on the basis of the main codebook; wherein, the main codebook can be generated and chosen according to the prior technical scheme, and the assistant codebook can be generated based on Fourier matrix or extended rotation matrix.
Owner:STATE GRID CORP OF CHINA +1
Channel state information reporting with basis expansion for advanced wireless communications systems
InactiveCN105406911ASpatial transmit diversitySignalling characterisationCommunications systemChannel state information feedback
Scalable channel state information feedback for FD-MIMO involves quantizing the downlink channel according to a finite set of basis vectors to reduce the number of coefficients quantized and reported from user equipment to a base station. The procedure includes measurement at the base station of angle of arrival spread for uplink signal reception from the user equipment and signaling that spread to the user equipment. The user equipment then quantizes the MIMO channel according to a sub-scheme configured based upon the signaled spread and reports (feeds back) the quantized channel to the base station.
Owner:SAMSUNG ELECTRONICS CO LTD
Channel state information feedback allocation method and device and measuring and feedback method and device
ActiveCN103580819AFlexible configurationError prevention/detection by using return channelSpatial transmit diversityChannel state information feedbackResource allocation
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD
Feedback and reception method and device for channel state information
ActiveCN102291228AError prevention/detection by using return channelError prevention/detection by diversity receptionHypothesisTerminal equipment
The embodiment of the invention discloses a channel state information feedback method, channel state information feedback equipment, a channel state information receiving method and channel state information receiving equipment. By the technical scheme provided by the embodiment of the invention, user equipment feeds channel state information back to network side equipment in a periodic reporting mode supporting coordinated multiple point (CoMP) transmission, wherein a corresponding periodic reporting mode comprises a reporting type used for feeding the rank indication (RI) of a main transmission point back, a reporting type used for feeding a channel quality indicator (CQI) and a precoding matrix indicator (PMI) of the main transmission point back, and / or a reporting type used for feeding the CQI and PMI of a non-main transmission point back, and / or a reporting type used for feeding the CQI and PMI, based on the hypothesis of RI=1, of the main transmission point back. Therefore, various CoMP transmission schemes can be supported.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Channel state information feedback method and terminal
InactiveCN101969363ASolve expensive problemsImprove performanceSignalling characterisationError prevention/detection by diversity receptionCommunications systemComputer terminal
The invention discloses a channel state information feedback method and a terminal. The method comprises the following steps: the terminal acquires channel state information, wherein the channel state information comprises channel quality indicator (CQI) information, pre-coding matrix indicator (PMI) information and rank indicator (RI) information; in an eight-antenna system, the PMI comprises a first kind of pre-coding matrix indicators (PMI1) and a second kind of pre-coding matrix indicators (PMI2); in a four-antenna system, the PMI comprises single PMI; and the terminal feeds back the channel state information on a physical uplink shared channel (PUSCH) according to the preset feedback method. The invention improves the performance of a communication system.
Owner:ZTE CORP
Scheduling method for ensuring time delay stability of non-real-time business data packet for OFDMA system
InactiveCN101026577ALower priorityImprove featuresError preventionDiversity/multi-antenna systemsNon real timeTime delays
Improving jitter performance of time delay of C-MCPFS proportion fairness algorithm in multicarrier system, the disclosed method accomplishes allocation of frequency resources. The method includes following five operation steps: (1) preparative step for partitioning resources, and setting up initialization parameters; (2) step for feeding back information of channel state; (3) step for allocating RB resources; (4) data transmission step; (5) step for estimating time delay of data packet. Considering channel state of user and practical transfer rate of traffic in scheduling process, the method keeps good proportion fairness performance. Two points of innovation are: introducing time delay control mechanism, and estimating time delay of data packet. The method provides smooth data rate for transmission layer, and keeps efficiency and fairness of C-MCPFS algorithm.
Owner:BEIJING UNIV OF POSTS & TELECOMM
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