Abstract: Embodiments of this application disclose a channel estimation method and apparatus. The method includes: receiving indication information for indicating M N-dimensional precoding vectors, wherein each precoding vector is applied to one of M frequency bands, wherein the M N-dimensional precoding vectors form a space-frequency matrix, wherein the space-frequency matrix is generated by performing a weighted combination on a plurality of space-frequency component matrices, wherein M?1, N?2, and both M and N are integers, wherein the space-frequency matrix is associated with one spatial stream of a plurality of spatial streams, and wherein quantities of frequency-domain component vectors associated with each of space-frequency matrices of different spatial streams of the plurality of spatial streams are the same; and determining the M N-dimensional precoding vectors based on the indication information.

Abstract: A communication method and apparatus are provided. In the method, when a symbol length remains unchanged, different cyclic shift code lengths and different useful symbol lengths may be configured, for example, a first cyclic shift code length and a second cyclic shift code length that are different, and a first useful symbol length and a second useful symbol length that are different, to flexibly adjust a frame structure.

Abstract: A terminal device sends T1 reference signals, where the T1 reference signals are reflected to a network device through a reconfigurable intelligent surface (RIS), T1 is a positive integer less than M, and M is a quantity of unit cells included in the RIS. The terminal device receives first information from the network device, where the first information indicates a value of T2, and T2 is a positive integer less than M. The terminal device sends T2 reference signals, where the T2 reference signals are reflected to the network device through the RIS, the T2 reference signals are used to estimate a cascaded channel, and the cascaded channel includes a channel between the network device and the RIS and a channel between the RIS and the terminal device.

Abstract: Aspects of the present disclosure provide methods and apparatuses for adapting configurations for converting between analog and digital signals. An apparatus receives, from a device, information indicative of an operating configuration for converting between analog and digital signals at the apparatus, and operates according to the operating configuration to which the received information is related. The operating configuration is associated with a bit resolution used by the apparatus when converting signals, a sampling rate used by the apparatus, and/or a combination of bit resolution and sampling rate used by the apparatus.

Abstract: Aspects of the present disclosure are directed to an indication of polarization direction association that indicates an association between a first resource with at least 1 port and a second resource with at least 1 port or between a first resource with at least 1 port and a first port of a second resource with at least 1 port to assist a user equipment (UE) in matching polarization direction with a base station in downlink (DL) reception or uplink (UL) transmission. The first resource may be one of CSI-RS, PDCCH, PDSCH, PUCCH, PUSCH, SRS, or PRACH. The second resource may be one of an SSB, CSI-RS, SRS or PRACH, and the SSB may comprise one or more of PSS, SSS, PBCH, and DMRS for PBCH. Other aspects may include group-based partitioning of antenna ports within a first resource and a second resource for providing a quasi-co-polarization direction association.

Abstract: Upon learning of a device's sensing capability, a network node may transmit, to the device, a sensing report configuration. The network node may transmit, to the device, a definition for a sensing region of a communication scheduling region. The network node may further transmit, to the device, a definition for a sensing feedback report channel. After transmitting, to the device, scheduled data transmissions, the network node may receive, from the device over the sensing feedback report channel, a sensing report based on processing those scheduled data transmissions that have been received, by the device, in the sensing region.

Abstract: The present disclosure relates to methods and communications apparatuses. One example method include generating and sending a channel state information (CSI) report. The CSI report indicates M space-frequency units and a weighting coefficient of a part or all of the M space-frequency units, each of the M space-frequency units corresponds to one space domain vector and one frequency domain vector, and a weighted sum of the part or all of the M space-frequency units is usable for determining a precoding matrix of a plurality of frequency domain units.

Abstract: Embodiments of this application relate to the field of communications technologies, and disclose a precoding matrix configuration method and apparatus, to help improve performance of decoding data. The method, applied to uplink communication, includes generating first configuration information to configure M precoding matrices, where M is an integer that is equal to or bigger than 2. The method further includes transmitting, to a terminal device, the first configuration information. In response to the uplink transmission is non-codebook-based uplink transmission, the first configuration information comprises first indication information indicating M sounding reference signal resource indicators (SRIs), and where the M SRIs are used to configure the M precoding matrices.

Abstract: Example parameter configuration methods and apparatus are described. One example method includes generating an indication of a first mapping relationship, where the first mapping relationship indicates a reporting quantity L0 of spatial domain vectors, a reporting quantity M0 of frequency domain vectors, and a ratio between a quantity K0 and 2L0×M0. A preconfigured first mapping relationship group includes at least one mapping relationship, and the at least one mapping relationship includes the first mapping relationship. Both L0 and M0 are positive integers, and K0 represents a quantity of space-frequency vector pairs that are in two polarization directions and that are for constructing a precoding vector. The method further includes sending the indication of the first mapping relationship.

Abstract: Aspects of the present disclosure provide a polarization direction indication that may enable UE beam measurement/reporting in symbols carrying reference signals for beam measurement (e.g, SSB) on a first polarization direction with UE data transmission/reception in the same symbols on a second polarization direction. Aspects of the present disclosure also provided a resource mapping scheme for data (e.g., PDSCH) and associated demodulation reference signal (e g., DMRS).

Abstract: In some embodiments, dual-polarized antennas may be implemented by establishing a mapping relation between synchronization signals and polarization directions of polarized antennas at the base station or polarization directions in relation to a reference plane. Examples of synchronization signals include primary synchronization signal (PSS), secondary synchronization signal (SSS), physical broadcast channel (PBCH), and demodulation reference signal (DMRS) for PBCH.

Abstract: This application provides a communication method and apparatus, to reduce complexity of channel estimation at a receiving end and improve performance of the receiving end. The method includes: A first terminal apparatus receives first information, where the first information indicates a port or ports corresponding to a first interference layer of the first terminal apparatus, the first interference layer is one or more interference layers in a plurality of interference layers of the first terminal apparatus, and the first interference layer is a transmission layer of a second terminal apparatus. The first terminal apparatus performs channel estimation based on the port(s) corresponding to the first interference layer.

Abstract: This application provides a data transmission method and a communication apparatus. The method includes: A first communication apparatus receives first information, where the first information is used to schedule transmission of first data and transmission of second data, the first data corresponds to a first reliability level, the second data corresponds to a second reliability level, and the first reliability level is different from the second reliability level; the first communication apparatus determines second information, where a first correspondence exists between the second information and both the first reliability level and the second reliability level; and the first communication apparatus transmits the first data and the second data based on the second information.

Abstract: Embodiments of this application provide a method and a communications apparatus. The method includes: sending first indication information that configures reporting bandwidth comprising a plurality of first-type frequency domain units on which reporting of a channel quality indicator (CQI) is based, the plurality of first-type frequency domain units comprise one or more first frequency domain units and one or more second frequency domain units, a granularity of a first frequency domain unit of the one or more first frequency domain units is less than a preconfigured first granularity, a granularity of a second frequency domain unit of the one or more second frequency domain units is the first granularity, and the first granularity is a frequency domain granularity preconfigured for reporting the CQI; and determining a plurality of second-type frequency domain units on which reporting of a precoding matrix indicator (PMI) is based under different conditions.

Abstract: This application provides a CSI measurement method and an apparatus. In the method, a terminal determines N (N is an integer greater than 1) RS groups, and sends the N RS groups to a network device. The network device receives the N RS groups sent by the terminal, and measures CSI based on at least one RS group in the N RS groups. The N RS groups each include a first RS used to measure the CSI and a second RS used to measure the CSI. Each of the first RS and the second RS in each RS group occupies one time-frequency resource segment. The time-frequency resource segment includes one time-domain resource segment and one frequency-domain resource segment. Frequency-domain resource segments occupied by different RS groups do not overlap. Time-domain resource segments occupied by different RS groups do not overlap.

Abstract: Aspects of the present disclosure provide systems and methods for supporting multi-layer data transmission. An apparatus (e.g. user equipment), upon request of a network device (e.g. base station), may generate a channel state information (CSI) report based on measurement of synchronization signal-physical broadcast channel (SS-PBCH) blocks (SSBs) transmitted over multiple antenna ports. The CSI report may include information related to apparatus-specific CSI and/or information indicative of quality of sub-channels. The network device may transmit configuration information related to the CSI report, measurement configuration of the SSBs, and/or configurations for supporting early MIMO transmission.

Abstract: Embodiments of the application may produce a dramatic reduction in reference signal overhead, enabling channel estimation and acquisition of MIMO with a very large bandwidth in the 10˜13 GHz range and a very ultra large number of antenna ports and a very large number of transmission layers, and exploit channel correlation in time/frequency/spatial domain. Firstly, a new signaling to indicate the topology structure of channel vectors is provided. Secondly, UE behavior is defined in terms of channel estimation and interpolation, based on the indicated topology structure. Thirdly, reference signal patterns are derived, again based on the topology structure.

Abstract: This application provides a channel state information (CSI) feedback method including: a communication apparatus receives first indication information, wherein the first indication information is determined based on a received precoded reference signal corresponds to P reference signal ports; the first indication information indicates B complex coefficients determined from K complex coefficients according to a preset priority value, the K complex coefficients are determined from a complex coefficient set comprising U complex coefficients that are determined for an sth reference signal port in S reference signal ports at each transport layer of Z transport layers, the S reference signal ports are a part or all of the P reference signal ports, the U complex coefficients are a part or all of Ts complex coefficients corresponding to the sth reference signal port; and determines a precoding matrix based on the first indication information.

Abstract: This disclosure provides a communication method to implement a function of a hybrid automatic repeat request (HARQ) feedback codebook in a multi-station scenario. In one example communication method performed by a communication apparatus comprises sending a plurality of configuration group identifiers, wherein a plurality of physical downlink shared channel (PDSCH) reception occasions correspond to the plurality of configuration group identifiers. Feedback information of the plurality of PDSCH reception occasions is received based on each of the plurality of configuration group identifiers and according to a predetermined rule of feedback sorting.

Abstract: Example precoding vector indication methods, precoding vector determining methods, and communications apparatus to reduce feedback overheads are described. One example method includes generating and sending a channel state information (CSI) report by a terminal device. A network device determines a precoding vector of one or more frequency domain units based on the CSI report. The CSI report is used to indicate M space-frequency units and a weighting coefficient of a part or all of the M space-frequency units, each of the M space-frequency units corresponds to one beam vector and one frequency domain vector, and a weighted sum of the part or all of the M space-frequency units is used to determine the precoding vector of the one or more frequency domain units.