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1. 发明申请

WO2022194822A1 METHODS AND APPARATUSES WITH CSI OMISSION FOR LINEAR COMBINATION PORT-SELECTION CODEBOOK 审中-公开
公开(公告)号：WO2022194822A1
公开(公告)日：2022-09-22
申请号：PCT/EP2022/056620
申请日：2022-03-15
申请人： FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
发明人： RAMIREDDY, Venkatesh , GROSSMANN, Marcus , LANDMANN, Markus
IPC分类号： H04B7/0417 , H04B7/0456 , H04B7/06
摘要： CSI report by a UE : determining (402) based on a received CSI report (401) configuration, a number of precoder coefficients for Rank Index (Rl) transmission layers of a precoder vector or matrix; grouping (403) the precoder coefficients of the Rl transmission layers into at least two coefficient subsets, each coefficient subset comprising a plurality of precoder coefficients; assigning (404) a certain ordering to said at least two coefficient subsets and to the precoder coefficients within each coefficient subset; dividing (405) said at least two coefficient subsets into two or more CSI groups having associated priority levels; generating (406) a CSI report comprising a CSI part 1 and a CSI part 2, wherein the CSI part 1 has a fixed payload size and comprises information indicating the size of the payload of the CSI part 2, wherein the CSI part 2 includes the precoder coefficients of at least one of the two CSI groups.

2. 发明申请

WO2019229152A1 DOPPLER-DELAY CODEBOOK-BASED PRECODING AND CSI REPORTING FOR WIRELESS COMMUNICATIONS SYSTEMS 审中-公开
公开(公告)号：WO2019229152A1
公开(公告)日：2019-12-05
申请号：PCT/EP2019/064024
申请日：2019-05-29
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
发明人： GROSSMANN, Marcus , RAMIREDDY, Venkatesh , LANDMANN, Markus , VARATHARAAJAN, Sutharshun
IPC分类号： H04B7/0456
摘要： A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive, from a transmitter a radio signal via a time-variant, frequency-selective MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration comprising a number of antenna ports, and downlink signals comprising the reference signal configuration; and a processor. The processor estimates an explicit CSI in the frequency domain using measurements on the downlink reference signals on the radio channel, the downlink reference signals provided over a certain observation time, selects, based on a performance metric, a Doppler-delay precoder matrix (W) for a composite Doppler-delay-beam three-stage precoder, the Doppler-delay-beam three-stage precoder being based on one or more codebooks, the one or more codebooks including one or more transmit-side spatial beam components of the composite Doppler-delay-beam three-stage precoder, one or more delay components of the composite Doppler-delay-beam three-stage precoder, and one or more Doppler-frequency components of the composite Doppler-delay-beam three-stage precoder, calculates either one or more of a channel quality indicator, CQI, and/or a precoder matrix indicator, PMI, and/or a rank indicator, Rl, using the explicit CSI and the composite Doppler-delay-beam three-stage precoder with the selected Doppler-delay-beam precoder matrix (l W ), and reports to the transmitter the CSI feedback including either one or more of the CQI, and/or the PMI and/or the Rl, wherein the PMI and Rl are used to indicate the Doppler-delay-beam three-stage composite precoder matrix for the configured antenna ports.

3. 发明申请

WO2020043282A1 RECEIVER, TRANSMITTER, SYSTEM AND METHOD EMPLOYING SPACE-DELAY PRECODING 审中-公开
公开(公告)号：WO2020043282A1
公开(公告)日：2020-03-05
申请号：PCT/EP2018/073254
申请日：2018-08-29
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
发明人： RAMIREDDY, Venkatesh , LANDMANN, Markus , GROSSMANN, Marcus
IPC分类号： H04B7/0456 , H04B7/06
摘要： A receiver is described that receives and processes a radio signal received via a frequency selective radio channel from a transmitter employing a plurality of transmission layers and transmit antennas. The receiver determines, based on the received signal, complex precoder coefficients of respective frequency-domain precoders for a first subset of transmission layers and transmit antennas at the transmitter so as to achieve a predefined property for a communication over the radio channel, and complex precoder coefficients and delays of respective space-delay precoders for a second subset of transmission layers and transmit antennas at the transmitter so as to achieve a predefined property for a communication over the radio channel. The receiver feeds back to the transmitter the determined delays explicitly or implicitly and the determined complex precoder coefficients explicitly or implicitly, the transmitter precoding the signals to be transmitted to the receiver using the fed back delays and complex precoder coefficients. The frequency-domain precoder has a dual-stage structure including a spatial codebook matrix including spatial beamforming vectors, and a combining element for complex scaling/combining one or more of the spatial beamforming vectors. The space-delay precoder has a dual-stage structure including a spatial codebook matrix including spatial beamforming vectors, a frequency-domain codebook matrix, wherein each vector of the frequency-domain codebook matrix is associated with a delay or delay difference, and a combining element per layer for complex scaling/combining one or more of the vectors from the spatial and/or frequency-domain codebook matrices.

4. 发明申请

WO2018141868A1 ANTENNA ARRAY CODEBOOK WITH BEAMFORMING COEFFICIENTS ADAPTED TO AN ARBITRARY ANTENNA RESPONSE OF THE ANTENNA ARRAY 审中-公开
公开(公告)号：WO2018141868A1
公开(公告)日：2018-08-09
申请号：PCT/EP2018/052560
申请日：2018-02-01
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
发明人： RAMIREDDY, Venkatesh , LANDMANN, Markus , GROSSMANN, Marcus
IPC分类号： H04B7/04 , H04B7/06
摘要： A transmitter includes an antenna array (202, 304) having a plurality of antennas for a wireless communication with one or more receivers, and a precoder (204) connected to the antenna array (202, 304), the precoder (204) to apply a set of beamforming weights to the antenna array (202, 304), the set of beamforming weights selected from a codebook (212) to form by the antenna array (202, 304) one or more transmit/receive beams or nulls pointing in selected directions. The codebook (212) includes a plurality of sets of beamforming weights for a plurality of directions. The beamforming weights in the codebook (212) are based on a first antenna array response matrix (A( l p, θ ), A ( h ) ( ϕ , θ ), A( V )( 0)), the first antenna array response matrix (A( l p, 0), A( h )( l p, 0), A ( v ) ( ϕ, θ )) defined by a second antenna array response matrix ( D ( ϕ,θ ))and one or more characteristic matrices (G, G ( h ) , G ( v ) ).The first antenna array response matrix ( A ( ϕ,θ ), A ( h ) ( ϕ, θ ), A ( v ) ( ϕ, θ ))contains, for a plurality of directions, first array response vectors of the antenna array (202, 304), the second antenna array response matrix (D( l p, Θ)) contains, for one or more of the plurality of directions, second array response vectors of another antenna array, the other antenna array being different from the antenna array (202, 304), and the one or more characteristic matrices (C, G( h)' G (V) ) describing one or more characteristics of the antenna array (202, 304).

5. 发明申请

WO2021260099A1 FLEXIBLE SRS SOUNDING FOR NR SYSTEMS 审中-公开
公开(公告)号：WO2021260099A1
公开(公告)日：2021-12-30
申请号：PCT/EP2021/067325
申请日：2021-06-24
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
发明人： GROSSMANN, Marcus , RAMIREDDY, Venkatesh
IPC分类号： H04L5/00 , H04L5/0048 , H04L5/006
摘要： A user device, UE, for a wireless communication network is configured or preconfigured with one or more Sounding Reference Signal, SRS, resources to be used for SRS transmissions. The one or more SRS resources include a plurality of frequency domain resources. Responsive to receiving an indication of a subset of SRS frequency domain resources for each resource, the UE performs an SRS transmission using the indicated subset of frequency domain resources.

6. 发明申请

WO2021148629A1 CSI REPORTING BASED ON LINEAR COMBINATION PORT-SELECTION CODEBOOK 审中-公开
公开(公告)号：WO2021148629A1
公开(公告)日：2021-07-29
申请号：PCT/EP2021/051494
申请日：2021-01-22
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
发明人： GROSSMANN, Marcus , RAMIREDDY, Venkatesh , LANDMANN, Markus
IPC分类号： H04B7/0456 , H04B7/0469 , H04B7/0478 , H04B7/10
摘要： A method for providing feedback about a MIMO channel between a transmitter and a receiver in a wireless communication system is described. The includes receiving, at the receiver, a radio signal via the MIMO channel, the radio signal including reference signals, like a CSI-RS signal, according to at least one reference signal configuration, the reference signal configuration being known at the receiver and indicating an antenna port or a plurality of antenna ports that is/are associated with a reference signal or a plurality of reference signals; estimating, at the receiver, the MIMO channel based on measurements on the one or more reference signals received over the plurality of antenna ports indicated in the reference signal configuration; determining, at the receiver, a precoding vector or matrix to be used at the transmitter so as to achieve a predefined property for a communication over the MIMO channel, the precoding vector or matrix being determined based on the estimated MIMO channel, on one or more vectors or one or more combinations of vectors selected from at least one port-selection codebook and on a set of precoding coefficients, wherein the port-selection codebook comprises a set of vectors, each vector being associated with one of the antenna ports and having a single element which is one and the remaining elements being zeros; and reporting, by the receiver, a feedback to the transmitter, the feedback indicating the precoding vector or matrix determined by the receiver.

7. 发明申请

WO2021028389A1 PRECODER MATRIX INDICATION AND CODEBOOK STRUCTURE FOR PRECODING FOR FREQUENCY SELECTIVE MIMO CHANNELS 审中-公开
公开(公告)号：WO2021028389A1
公开(公告)日：2021-02-18
申请号：PCT/EP2020/072390
申请日：2020-08-10
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
发明人： GROSSMANN, Marcus , RAMIREDDY, Venkatesh , LANDMANN, Markus
IPC分类号： H04B7/0456 , H04B7/06
摘要： A communication device for performing in a wireless communication system a transmission to a network entity, like a base station or another communication device of the wireless communication system. The communication device receives from the network entity of the wireless communication system a precoding matrix indicator indicating a precoder matrix for one or more transmission layers and transmission resources, like time domain resources and/or frequency-domain resources, of a transmission channel (PUSCH, PSSCH) to the network entity. The communication device includes a precoder, wherein the precoder is to precode, responsive to the received precoding matrix indicator, time domain resources and/or frequency-domain resources of the transmission channel (PUSCH, PSSCH) to the network entity over one or more ports of the communication device. The communication device performs the transmission to the network entity using the precoded time domain resources and/or frequency-domain resources of the transmission channel (PUSCH, PSSCH) over the one or more ports. The precoder is based on one or more codebooks and a plurality of combining coefficients for complex combining components from the one or more codebooks, the one or more codebooks including one or more of: • a spatial codebook comprising one or more spatial beam or port selection components of the precoder, and/or • a delay codebook comprising one or more delay components of the precoder, and/or • a Doppler-frequency codebook comprising one or more Doppler-frequency components of the precoder.

8. 发明申请

WO2023285079A1 METHODS AND APPARATUSES FOR CSI REPORTING FOR JOINT TRANSMISSION IN A WIRELESS COMMUNICATIONS NETWORK 审中-公开
公开(公告)号：WO2023285079A1
公开(公告)日：2023-01-19
申请号：PCT/EP2022/066821
申请日：2022-06-21
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
发明人： GROSSMANN, Marcus , RAMIREDDY, Venkatesh , LANDMANN, Markus
IPC分类号： H04B7/0456 , H04B7/06 , H04B7/024
摘要： The embodiments of the present disclosure relate to methods and apparatuses for the generation and transmission/reception of a CSI report or CSI feedback report. The method performed by a UE (700) includes: receiving (401A) from a network node (800) a CSI report configuration indicating a number of antenna port groups or CSI-RS port groups; determining (402A) based on the CSI report configuration a precoder matrix for a number of antenna or CSI-RS port groups; generating (403A), a CSI feedback report comprising a Precoder Matrix Indicator (PMI) indicating the precoder matrix for the number of antenna or CSI-RS port groups; and reporting (404A), to the network node (800), the CSI report or the CSI feedback report. The embodiments also relate to a method performed by a network node (800), a UE (700) and a network node (800).

9. 发明申请

WO2020182269A1 CSI REPORTING AND CODEBOOK STRUCTURE FOR DOPPLER-DELAY CODEBOOK-BASED PRECODING IN A WIRELESS COMMUNICATIONS SYSTEMS 审中-公开
公开(公告)号：WO2020182269A1
公开(公告)日：2020-09-17
申请号：PCT/EP2019/055832
申请日：2019-03-08
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
发明人： RAMIREDDY, Venkatesh , GROSSMANN, Marcus , LANDMANN, Markus
IPC分类号： H04B7/0456 , H04B7/06 , H04B7/10
摘要： A communication device for providing a channel state information, CSI, feedback in a wireless communication system is described. The communication device includes a transceiver configured to receive, from a transmitter a radio signal via a time-variant, frequency-selective MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration comprising a number of antenna ports, and downlink signals comprising the reference signal configuration; and a processor. The processor is configured to - estimate an explicit CSI in the frequency domain using measurements on the downlink reference signals on the radio channel, the downlink reference signals provided over a certain observation time, - select a Doppler-delay precoder matrix ( W ) for a composite Doppler-delay-beam three- stage precoder, the Doppler-delay-beam three-stage precoder being based on one or more codebooks, the one or more codebooks including o one or more transmit-side spatial beam components of the composite Doppler- delay-beam three-stage precoder, o one or more delay components of the composite Doppler-delay-beam three- stage precoder, and o one or more Doppler-frequency components of the composite Doppler-delay- beam three-stage precoder, - calculate either one or more of a channel quality indicator, CQI, and/or a precoder matrix indicator, PMI, and/or a rank indicator, Rl, using the explicit CSI and the composite Doppler-delay-beam three-stage precoder with the selected Doppler-delay- beam precoder matrix ( W ), and - report to the transmitter the CSI feedback including either one or more of the CQI, and/or the PMI and/or the Rl, wherein the PMI and Rl are used to indicate the Doppler-delay-beam three-stage composite precoder matrix for the configured antenna ports. The communication device incudes one or more parameters ( D, F ), the parameter indicating a number of delay components, like delay DFT vectors (I), and/or a number of Doppler-frequency components, like Doppler DFT vectors (II), to be used by the communication device when calculating the Doppler-delay precoder matrix ( W ). The communication device is configured to select from the one or more codebooks a subset of D delay components and/or a subset of F Doppler-frequency components and to use the selected subset of delay components for each polarization ( p ) and each spatial beam ( u ) and/or the selected subset of Doppler-frequency components for each polarization ( p ), each spatial beam ( u ) and each delay ( d ), when calculating the Doppler-delay precoder matrix ( W ).

10. 发明申请

WO2020002645A1 ANTENNA ARRAY CODEBOOK WITH BEAMFORMING COEFFICIENTS ADAPTED TO AN ARBITRARY ANTENNA RESPONSE OF THE ANTENNA ARRAY 审中-公开
公开(公告)号：WO2020002645A1
公开(公告)日：2020-01-02
申请号：PCT/EP2019/067418
申请日：2019-06-28
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
发明人： RAMIREDDY, Venkatesh , LANDMANN, Markus , GROSSMANN, Marcus
IPC分类号： H04B7/0456 , H04B7/06
摘要： A receiver, comprising includes an antenna (202) for a wireless communication with a transmitter and a signal processor (302, 306, 306) to receive and process a radio signal received at the antenna via a radio channel (400). The receiver constructs a codebook (212) including a plurality of sets of beamforming weights for a plurality of directions, the beamforming weights in the codebook (212) being based on a first antenna array response matrix (Α(φ, Θ), A (h) (φ, Θ), A (v) (φ, Θ)) of a transmitter antenna array (202, 304) of the transmitter, and the transmitter selecting a set of beamforming weights from the codebook (212) to form by the transmitter antenna array (202, 304) a transmit/receive beam pointing in a selected direction. The receiver calculates one or more characteristic matrices (G, G (h) , G (v) based on a model of the transmitter antenna array (202, 304) using (a) received position data of antenna elements of the transmitter antenna array and a preferred polarization of each antenna element, and/or (b) structural and/or geometrical data of the transmitter antenna array. The receiver constructs the codebook (212) using a second antenna array response matrix (D(φ, Θ)) and the one or more calculated characteristic matrices (G, G (h) , G (v) ). The first antenna array response matrix (Α(φ,Θ), A (h) (φ, Θ),A (v) (φ, Θ)) contains, for a plurality of directions, first array response vectors of the transmitter antenna array (202, 304), the second antenna array response matrix (D(φ, Θ)) contains, for one or more of the plurality of directions, second array response vectors of another antenna array, the other antenna array being different from the transmitter antenna array (202, 304), and the one or more characteristic matrices (G, G (h) , G (v) ) describing one or more characteristics of the transmitter antenna array (202, 304), and the first antenna array response matrix (Α(φ,Θ), A (h) (φ, Θ),A (v) (φ, Θ)) is modeled using the second antenna array response matrix (D( φ,θ )) and the one or more characteristic matrices (G, G (h) , G (v) ), each of the first array response vectors (a(φ m ,Θ n ),a (h) Θ n ), α (ν) (φ m ,Θ n )) being a product of a characteristic matrix (G, G (h) , G (v) ) and a corresponding second array response vectors d (φ m , Θ n ).

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