Method for channel state information feedback, method for a base station, and user equipment

Abstract

Methods, base stations, and wireless devices are provided for the dynamic indication of channel state information (CSI) features. According to one aspect, a method, for a wireless device, to determine a feature set of the channel state information reference symbol, CSI-RS, indicated by a base station is provided. The method includes determining a CSI-RS feature set based on an indication of a CSI report definition. The CSI report definition has a one-to-one correspondence with respect to a CSI-RS feature set.

Description

64 METHOD FOR CHANNEL STATE INFORMATION FEEDBACK, METHOD FOR A BASE STATION, AND USER EQUIPMENT Technical Field

[001] This description refers to wireless communications and, in particular, to dynamic indication for channel status information feedback (CSI). Fundamentals of the Invention

[002] The fifth generation of mobile and wireless telecommunications technology is not yet fully defined, but is in an advanced stage of preparation in 3GPP. This includes work on 5G New Radio Access (NR) Technology. LTE terminology is used in this description in an innovative sense, to include equivalent 5G entities or functionalities, although different terms may be specified in 5G. A general description of the agreements on 5G New Radio Access (NR) Technology to date is contained in 3GPP TR 38.802 V1.0.0 (2016-11). Final specifications may be published, among others, in future 3GPP TS 38.3** and / or 38.2** series.

[003] The next generation of mobile wireless communication systems, such as fifth generation (5G) or new radio (NR), will support a diverse set of use cases and a diverse set of deployment scenarios. The latter includes deployment at both low frequencies (hundreds of MHz), similar to today's Long Term Evolution (LTE), and very high frequencies (millimeter waves in the tens of GHz). At high frequencies, propagation characteristics make achieving good coverage challenging. One solution to the coverage problem is to employ high-gain beamforming, typically facilitated by analog circuit systems, in order to achieve a satisfactory link budget. Beamforming will also be used at lower frequencies (typically, the Petition 870250059249, dated 11 / 07 / 2025, page 14 / 131 / 64 digital beamforming that primarily uses the digital circuit system), and is expected to be similar in nature to the already standardized LTE (4G) system of the Third Generation Partnership Project (3GPP).

[004] Of particular relevance is Section 6.10.5 of the 3GPP TS 36.211 V14.1.0 (2016-12) standard, which refers to the Channel State Information Reference Signal (CSI-RS). A similar signal is expected to be designed for NR as well, and it is the subject of this description.

[005] Note that the terminology used here, such as Node B (gNB) and Wireless Device (WD) New Radio, should be considered non-limiting and does not imply a certain hierarchical relationship between the two; in general, “gNB” can be read as a reference to generic device 1 and “WD” as device 2, where these two generic devices can communicate with each other through some radio channel. Alternatively, other terminology, such as “gNodeB”, “eNodeB” and “eNB”, can be used in place of “gNB” in different communication systems.

[006] LTE and NR use orthogonal frequency division multiplexing (OFDM) on the downlink and spread discrete Fourier transform (DFT) OFDM or OFDM on the uplink. The physical feature on the basic LTE or NR downlink can thus be viewed as a time-frequency grid, as illustrated in Figure 1, where each feature element corresponds to an OFDM subcarrier during an OFDM symbol interval. Although a subcarrier spacing of Δf = 15 kHz is shown in Figure 1, different values ​​of subcarrier spacing are supported in NR. The supported subcarrier spacing values ​​(also referred to as different numerologies) in NR are given by Δf = (15χ2Λα) kHz, where α is a non-negative integer.

[007] In the time domain, downlink transmissions LTE signals are organized into 10 ms radio frames, each radio frame Petition 870250059249, dated 11 / 07 / 2025, page 15 / 131 / 64, consisting of ten equally sized subframes of length Tsubframe = 1 ms, as shown in Figure 2. A similar frame structure can also be used in NR, where the subframe length is fixed at 1 ms, regardless of the subcarrier spacing used. The number of intervals per subframe depends on the configured subcarrier spacing. The interval duration for a subcarrier spacing of (15 x α2) kHz is given by 1 / α2 ms, considering 14 OFDM symbols per interval.

[008] Furthermore, resource allocation in LTE is typically described in terms of resource blocks, where a resource block (RB) corresponds to an interval (0.5 ms) in the time domain and 12 contiguous subcarriers in the frequency domain. Resource blocks are numbered in the frequency domain, starting with 0 from the end of the system bandwidth. In NR, resource allocation in the time domain can be in interval units (i.e., interval-based transmission) or in length units smaller than an interval (i.e., non-interval-based transmission).

[009] Downlink transmissions are dynamically scheduled, that is, in each subframe, gNB transmits control information regarding which terminal data is transmitted, and over which resource blocks the data is transmitted, in the current downlink subframe. This control signaling is typically transmitted in the first 1, 2, 3, or 4 OFDM symbols in each subframe in LTE and 1 or 2 OFDM symbols in NR. A downlink system with 3 OFDM symbols as control for LTE is illustrated in Figure 3. Precoding Based on Codebook

[0010] Multi-antenna techniques can significantly increase the data rates and reliability of a wireless communication system. Performance is particularly improved if both the transmitter and the Petition 870250059249, dated 11 / 07 / 2025, page 16 / 131 / 64 receivers are equipped with multiple antennas, resulting in a multiple-input multiple-output (MIMO) communication channel. Such systems and / or related techniques are commonly referred to as MIMO.

[0011] NR is currently evolving with support for MIMO. A central component in NR is support for MIMO antenna implementations and MIMO-related techniques, including beamforming at higher carrier frequencies. Currently, LTE and NR support an 8-layer spatial multiplexing mode for up to 32 transmit (Tx) antennas with channel-dependent precoding. The spatial multiplexing mode is targeted for high data rates under favorable channel conditions. An illustration of spatial multiplexing operation is provided in Figure 4.

[0012] As seen in Figure 4, the symbol vector s carrying the information is multiplied by an NTx r W precoder matrix, which serves to distribute the transmission energy in a subspace of the NT-dimensional vector space (corresponding to NT antenna ports). The precoder matrix is ​​typically selected from a codebook of possible precoder matrices, and typically indicated by a precoder matrix indicator (PMI), which specifies a unique precoder matrix in the codebook for a given number of continuous symbol streams. Each of the symbols r in s corresponds to a layer, r is referred to as the transmission rank. In this way, spatial multiplexing is achieved since multiple symbols can be transmitted simultaneously through the same time / frequency resource element (TFRE). The number of symbols r is typically adapted to satisfy the current channel properties.

[0013] LTE and NR use OFDM on the downlink and therefore the NR x 1 yn received vector for a certain TFRE on subcarrier n (or, alternatively, the number n of TFREs of the data) is therefore modeled by Petition 870250059249, dated 11 / 07 / 2025, p. 17 / 131 / 64 yn = HnWSn + em where en is a noise / interference vector obtained as realizations of a random process. The precoder, W, can be a wideband precoder, which is frequency constant or frequency selective.

[0014] The precoder matrix is ​​often chosen to match the characteristics of the NR x NT Hn MIMO channel matrix, resulting in so-called channel-dependent precoding. This is also commonly referred to as closed-loop precoding and essentially strives to focus the transmission energy into a subspace that is strong in driving much of the transmitted energy to the WD. Furthermore, the precoder matrix can also be selected to strive to orthogonalize the channel, meaning that after appropriate linear equalization in the WD, interlayer interference is reduced.

[0015] The transmission rank, and thus the number of spatially multiplexed layers, is reflected in the number of columns in the precoder. For efficient performance, a transmission rank that matches the channel properties should be selected. Channel State Information (CSI) Estimation and Feedback Based on Codebook

[0016] In LTE closed-loop MIMO transmission schemes, such as transmission mode 9 and transmission mode 10, a WD estimates and feeds back CSI on the downlink to eNodeB. The eNB uses the feedback CSI to transmit the downlink data to the WD. The CSI consists of a transmission rank indicator (RI), a precoding matrix indicator (PMI), and one or more channel quality indicators (CQI). A codebook of precoding matrices is used by the WD to find the best match between the channel in Petition 870250059249, dated 11 / 07 / 2025, p. 18 / 131 / 64 estimated downlink Hn and a precoding matrix in the codebook based on certain criteria, for example, WD throughput. The channel Hn is estimated based on a Non-Zero Power CSI (CSI-RS NZP) reference signal transmitted on the downlink for transmission mode 9 and transmission mode 10.

[0017] The CQI / RI / PMI, together, provide the downlink channel state to the WD. This is also referred to as implicit CSI feedback since the Hn estimate is not directly fed back. The CQI / RI / PMI can be broadband or sub-band, depending on which reporting mode is configured.

[0018] The RI corresponds to a recommended number of continuous streams that should be spatially multiplexed and thus transmitted in parallel across the downlink channel. The PMI identifies a code word from the recommended precoding matrix (in a codebook containing precoders with the same number of lines as the number of CSI-RS ports) for the transmission, which refers to the spatial characteristics of the channel. The CQI represents a recommended transport block size (i.e., code rate), and LTE supports the transmission of one or two simultaneous transmissions (in different layers) of transport blocks (i.e., the separately encoded information blocks) to a WD in a subframe. There is therefore a relationship between a CQI and a signal-to-interference-plus-noise ratio (SINR) of the spatial continuous stream(s) across which the transport block(s) are transmitted.

[0019] Codebooks with up to 16 antenna ports were defined in LTE above Edition 13. Both one-dimensional (1D) and two-dimensional (2D) antenna arrays are supported. For LTE Edition 12 and earlier, only one codebook feedback for a one-dimensional (1D) port scheme is supported, with 2, 4, or 8 antenna ports. Petition 870250059249, dated 11 / 07 / 2025, page 19 / 131 / 64 Therefore, the codebook is designed considering that these ports are arranged in a straight line in one dimension. For LTE Rel-13, codebooks for two-dimensional (2D) port schemes were specified for the case of 8, 12, or 16 antenna ports. Furthermore, a codebook for the 1D port scheme for the case of 16 antenna ports was also specified in LTE Rel-13. In LTE Rel-14, the 1D and 2D codebooks are extended to 32 ports (specifically, 1D and 2D codebooks for 20, 24, 28, and 32 ports are supported in LTE Rel-14).

[0020] In LTE Rel-13, two types of CSI reporting were introduced, namely Class A and Class B. In Class A CSI reporting, a WD measures and reports CSI based on a new codebook for the 2D antenna array configured with 8, 12, or 16 antenna ports. The Class A codebook is defined by five parameters, namely (N1, N2, Q1, Q2, CodebookConfig), where (N1, N2) are the number of antenna ports in a first and second dimension, respectively. (Q1, Q2) are the DFT oversampling factor for the first and second dimensions, respectively. CodebookConfig ranges from 1 to 4 and defines four different ways in which the codebook is formed.For CodebookConfig = 1, a precoding matrix indicator (PMI) corresponding to a single 2D beam is fed back to the entire system bandwidth, while for CodebookConfig = {2, 3, 4}, the PMIs corresponding to four 2D beams are fed back and each sub-band can be associated with a different 2D beam. The CSI consists of a rank indicator (RI), a PMI, and a channel quality indicator (CQI) or CQIs, similar to the CSI report prior to Rel-13.

[0021] In the Class B CSI report, in one scenario (also referred to as “K_(csi-Rs)>1”), the eNB can pre-form multiple beams in one antenna dimension. There may be multiple gates (1, 2, 4, or 8 gates) in each beam in the other antenna dimension. The “formed beam” CSI-RSs Petition 870250059249, dated 11 / 07 / 2025, p. 20 / 131 / 64 are transmitted along each beam. A WD first selects the best beam from a configured beam group and then measures the CSI on the selected beam based on the LTE codebook prior to Edition-13 for 2, 4, or 8 ports. The WD then reports back the selected beam index and the CSI corresponding to the selected beam. In another scenario (also referred to as “K_(CSI-RS) = 1”), the eNB can form up to 4 beams (2D) in each polarization and the “formed beam” CSI-RS is transmitted along each beam. A WD measures the CSI on the “formed beam” CSI-RS and the feedback CSI based on a new Class B codebook for 2, 4, or 8 ports. Channel State Information Reference Symbols (CSI-RS)

[0022] In LTE and NR, a reference symbol sequence is inserted with the intention of estimating channel state information, the CSI-RS. The CSI-RS provides several advantages over basing CSI feedback on the common reference symbols (CRS) that were used for this purpose in previous editions of LTE. First, the CSI-RS is not used for data signal demodulation and thus does not require the same density of CRS (i.e., the overprocessing of CSI-RS is substantially less). Second, the CSI-RS provides a much more flexible means of configuring CSI feedback measurements (e.g., which CSI-RS feature to measure can be configured in a WD-specific manner).

[0023] By measuring a CSI-RS, a WD can estimate the effective channel that the CSI-RS is traversing, including the radio propagation channel and antenna gains. With more mathematical rigor, this implies that if a known CSI-RS signal X is transmitted, a WD can estimate the coupling between the transmitted signal and the received signal (i.e., the effective channel). Therefore, if no virtualization is performed in the transmission, the received signal can be expressed as: Petition 870250059249, 11 / 07 / 2025, p. 21 / 131 / 64 y = Hx + e, and the WD can estimate the effective channel H. Up to 32 CSIRS ports can be configured for a WD LTE or NR. That is, the WD can estimate the channel from up to thirty-two transmit antenna ports.

[0024] An antenna port is equivalent to a feature of the reference signal that the WD uses to measure the channel. Therefore, the base station, such as a gNB with two antennas, can define two CSI-RS ports, where each port is a set of feature elements in the temporal frequency grid in a subframe or interval. The base station transmits each of these two reference signals from each of the two antennas, so that the WD can measure the two radio channels and report the channel state information back to the base station based on these measurements. In LTE, CSI-RS features with 1, 2, 4, 8, 12, 16, 20, 24, 28, and 32 ports are supported.

[0025] In LTE, CSI-RS uses a length-two orthogonal coverage code (OCC) to overlay two antenna ports on two consecutive Feature Elements (REs). More specifically, Figures 5A-5C illustrate the feature element grids in a pair of feature blocks (RB) showing the potential positions for the specific WD RS from Edition 9 / 10, the CSI-RS (marked with a number corresponding to the CSI-RS antenna port), and CRS. As shown in Figures 5A-5C, many different CSI-RS patterns are available. For the case of 2 CSI-RS antenna ports, Figures 5A show that there are 20 different patterns in a subframe. As shown in Figures 5B and 5C, the corresponding number of patterns is 10 and 5 for 4 and 8 CSI-RS antenna ports, respectively. For TDD, some additional CSI-RS patterns are available.Furthermore, LTE supports additional OCC lengths of four and eight to support full power utilization in the case of the increased number of CSI-RS ports. The OCC length of 4 is... Petition 870250059249, dated 11 / 07 / 2025, p. 22 / 131 / 64 is supported when the number of CSI-RS ports is equal to or greater than 12. OCC length 8 is supported when the number of CSI-RS ports is 24 or 32.

[0026] The CSI reference signal settings are given by Table 1, taken from the 3GPP LTE TS 36.211 v.12.5.0 specifications. For example, the RS 5 CSI configuration for 4 antenna ports uses (k',l') = (9,5) in interval 1 (the second subframe interval) and, using the following formulas, it follows that ports 15, 16, use OCC on Feature Elements (k, l) = (9, 5), (9, 6) and ports 17, 18 use OCC on Feature Elements (3, 5) (3, 6), respectively, (considering the Physical Feature Block (PRB) index m = 0), where k is the subcarrier index and l is the OFDM symbol index. TABLE 1 Petition 870250059249, dated 11 / 07 / 2025, page 23 / 131 11 / 64 CSI reference signal configuration Number of configured CSI reference signals lou 2 4 8 ns mod2 ns mod2 ns mod2 Frame structure types 1 and 2 0 (9,5) 0 (9,5) 0 (9,5) 0 1 (11,2) 1 (11,2) 1 (11,2) 1 2 (9,2) 1 (9,2) 1 (9,2) 1 3 (7,2) 1 (7,2) 1 (7,2) 1 4 (9,5) 1 (9,5) 1 (9,5) 1 5 (8,5) 0 (8,5) 0 6 (10,2) 1 (10,2) 1 7 (8,2) 1 (8,2) 1 8 (6,2) 1 (6,2) 1 9 (8,5) 1 (8,5) 1 10 (3.5) 0 11 (2.5) 0 12 (5.2) 1 13 (4.2) 1 14 (3.2) 1 15 (2.2) 1 16 (1.2) 1 17 (0.2) 1 18 (3.5) 1 19 (2.5) 1 frame structure 20 (11.1) 1 (11.1) 1 (11.1) 1 21 (9.1) 1 (9.1) 1 (9.1) 1 22 (7.1) 1 (7.1) 1 (7.1) 1 23 (10.1) 1 (10.1) 1 24 (8.1) 1 (8.1) 1 25 (6.1) 1 (6.1) 1 26 (5.1) 1 27 (4,1) 1 28 (3,1) 1 29 (2,1) 1 30 (1,1) 1 31 (0,1) 1

[0027] The orthogonal coverage code (OCC) is introduced below by the wr factor. Petition 870250059249, dated 11 / 07 / 2025, p. 24 / 131 12 / 64 k - k'+12m + < -o -O for pe {15,16}, normal cyclic prefix for pe {17,18}, normal cyclic prefix for pe {19,2θ}, normal cyclic prefix for pe {21,22}, normal cyclic prefix for p G {15,16}, extended cyclic prefix for pe {17,18}, extended cyclic prefix for p G {19,2θ}, extended cyclic prefix. for pe{21,22}, extended cyclic prefix CSI reference signal settings 0-19, normal cyclic prefix 2Γ CSI reference signal settings 20-31, normal cyclic prefix Γ CSI reference signal settings 0-27, extended cyclic prefix pe{15,17,19,21} ''[(-if pe{16,18,20,22} Z = 0.l m'-m + ymax,DL »rDL;VRB'VRB

[0028] Two types of CSI-RS can be defined: CSI-RS with non-zero power (NZP) and CSI-RS with zero power (ZP). NZP CSI-RS is transmitted by a network node (or gNB) to the WDs to estimate channels in a downlink to the network node. Whereas, for ZP CSI-RS, one or more CSI-RS resource(s) is / are allocated by the network node, but nothing is transmitted on the resources, which can be used to reduce interference in neighboring cells, so that the best channel estimate can be performed by the WDs in neighboring cells.

[0029] In NR, the following three types of CSI-RS transmissions are supported: * Aperiodic CSI-RS Transmission: This is a one-opportunity CSI-RS transmission that can occur in any subframe or interval. Here, one opportunity means that the CSI-RS transmission occurs only once per trigger in an interval or subframe. CSI-RS resources (i.e., the resource element locations consisting of subcarrier locations and OFDM symbol locations) for CSI-RS Petition 870250059249, dated 11 / 07 / 2025, p. 25 / 131 / 64 aperiodic signals are preconfigured for WDs via upper-layer signaling. Aperiodic CSI-RS transmission is triggered by dynamic signaling.

[0030] * CSI-RS Periodical Transmission: These transmissions of CSI-RS are preconfigured by upper-layer signaling, and the preconfiguration includes parameters such as periodicity and subframe offset, similar to LTE. Periodic CSI-RS is controlled by upper-layer signaling only, and dynamic signaling is not required to trigger periodic CSI-RS transmission. That is, periodic CSI-RS transmission initiates following the Radio Resource Control (RRC) configuration, which follows the configured parameters.

[0031] * Semi-persistent CSI-RS transmission: Similar to periodic CSI-RS, resources for semi-persistent CSI-RS transmissions are preconfigured via upper-layer signaling with parameters such as periodicity and subframe offset. However, unlike periodic CSI-RS, dynamic allocation signaling is required to initiate semi-persistent CSI transmission on the preconfigured resources. Furthermore, as shown in Figure 6, semi-persistent CSI is transmitted for a limited duration (which can be referred to as the time duration during which the semi-persistent CSI-RS is allocated). In some cases, dynamic deallocation signaling is required to interrupt semi-persistent CSI transmission.

[0032] In addition to multiple CSI-RS transmission types, NR also supports multiple CSI report types. The following CSI report types will be supported in NR: * Aperiodic CSI report: This type of CSI report involves a one-time (i.e., once) CSI report by the WD that is dynamically triggered by the gNB. Petition 870250059249, dated 11 / 07 / 2025, p. 26 / 131 / 64

[0033] * Periodic CSI reporting: CSI is reported periodically by the WD. Parameters such as periodicity and subframe offset are configured by upper-layer signaling.

[0034] * Semi-persistent CSI report: similar to periodic CSI reports, semi-persistent CSI reports have a periodicity and a subframe shift. However, a dynamic trigger may be required to initiate semi-persistent CSI reporting. In some cases, a dynamic trigger may be required to interrupt semi-persistent CSI reporting.

[0035] With reference to the relationship of the different types of CSI-RS with the different types of CSI reporting, the combinations that will be supported in NR are shown in Table 2. TABLE 2 - Combinations of CSI-RS types and CSI report types supported by NR ____________________________________________ aperiodic CSI report periodic CSI report semi-persistent CSI-RS aperiodic supported unsupported unsupported CSI-RS semi-persistent supported supported unsupported CSI-RS periodic supported supported supported Interference Measurement Resources (IMRs)

[0036] In LTE, the Interference Measurement (IMR) feature was introduced in transmission mode 10, which gives the benefit that the CSI measurement is better defined, compared to other transmission modes (e.g., transmission mode 9) where interference measurements are undefined. This gives a performance improvement of transmission mode 10 over other transmission modes.

[0037] CSI-RS ZP-based IMR is already supported in LTE. CSI-RS ZP-based IMR is typically used for non-coherent interference measurement, where the WD measures the interference power in the IMR. Such CSI-RS ZP-based interference power measurements are useful in most cases, except those involving certain use cases such as MU-MIMO (i.e., data transmission to multiple WDs in the same unit). Petition 870250059249, dated 11 / 07 / 2025, page 27 / 131 / 64 same resource), coordinated multipoint (COMP) (i.e., data transmission to a WD from one or more coordinated transmitters), etc. In some cases, coherent interference measurement is useful when the WD measures the channel of the interferer. A potential use case is the accurate estimation of interference to suppress interference from dominant interferers. An IMR based on CSI-RS NZP is well suited for such coherent interference measurement. In NR, it is likely that two types of IMRs based on CSI-RS ZP and CSI-RS NZP will be supported.

[0038] Efficient mechanisms for channel state information feedback (CSI) are needed. Summary of the Invention

[0039] Some embodiments advantageously provide the methods, base stations, and wireless devices for using control signaling for dynamic indication of channel state information (CSI) resources. According to one aspect, some embodiments include a method of initiating channel state information, CSI, feedback in a wireless device configured by higher layers with M Report Definitions containing the parameters related to CSI reporting and N Resource Definitions containing the parameters that define the resources used for channel measurement and their properties.The method includes a) obtaining the preconfigured links between the Report Definitions and the Resource Definitions through the upper-layer configuration; b) determining S CSI-RS Resource Sets in each Resource Definition based on the upper-layer configuration where a CSI-RS Resource Set contains multiple CSI-RS resources used for channel measurement; c) receiving through the upper-layer configuration a preconfigured match between one of the S CSI-RS Resource Sets in one of the Resource Definitions and a part or the entirety of a Report Definition. Petition 870250059249, dated 11 / 07 / 2025, page 28 / 131 / 64 of CSI that is linked in the Resource Definition using parameter configuration compatibility; ed) receive a dynamic indication associated with the match between the CSI-RS Resource Set and the CSI Report Definition.

[0040] According to another aspect, a method, for a wireless device, to determine a feature set of the channel state information reference symbol, CSI-RS, indicated by a base station is provided. The method includes determining a CSI-RS feature set based on an indication of a CSI report definition, the CSI report definition having a one-to-one correspondence with respect to a CSI-RS feature set.

[0041] According to another aspect, a wireless device is provided that initiates channel state information feedback, CSI, in a wireless device configured by upper layers with M Report Definitions containing the parameters related to CSI reporting and N Resource Definitions containing the parameters that define the resources used for channel measurement and their properties, the wireless device comprising the processing circuitry system configured to perform at least one of: a) obtaining the preconfigured links between the Report Definitions and the Resource Definitions through the upper layer configuration; b) determining S CSI-RS Resource Sets in each Resource Definition based on the upper layer configuration where a CSI-RS Resource Set contains multiple CSI-RS resources used for channel measurement;c) receive, through the top-layer configuration, a preconfigured match between a CSI-RS Resource Set in a Resource Definition and a part or the entirety of a CSI Report Definition that is linked in the Resource Definition using parameter configuration compatibility; and d) receive a dynamic indication associated with the match between the Resource Set of; Petition 870250059249, dated 11 / 07 / 2025, page 29 / 131 / 64 CSI-RS and the Definition of the CSI Report.

[0042] According to yet another aspect, a wireless device is provided for determining the features of the Channel State Information Reference Symbol, CSI-RS, indicated by a base station, the wireless device (40) comprising the processing circuitry system configured to determine a CSIRS feature set based on an indication of a CSI report definition, the CSI-RS report definition having a one-to-one correspondence with respect to a CSI-RS feature set.

[0043] According to yet another aspect, a wireless device is provided for determining the features of the Channel State Information Reference Symbol, CSI-RS, indicated by a base station. The wireless device includes a determination module for determining a CSI-RS feature set based on an indication of a CSI report definition, the CSI-RS report definition having a one-to-one correspondence with respect to a CSI-RS feature set.

[0044] According to another aspect, a method is provided for a base station. The method involves sending, to the wireless device, a dynamic indication of a CSI report definition and one or more CSI-RS features, wherein a one-to-one correspondence between a CSI report definition and a CSI reference symbol, RS, feature set is established.

[0045] According to another aspect, a base station is provided that uses control signaling for the dynamic indication of channel state information, CSI, resources to a wireless device. The base station includes a processing circuitry system configured to send to the wireless device an indication of the CSI report definition and CSI-RS resources, in which a one-to-one correspondence exists between a CSI report definition and a reference symbol resource set. Petition 870250059249, dated 11 / 07 / 2025, p. 30 / 131 / 64 (RS) from CSI is established.

[0046] According to yet another aspect, a base station for signaling the Channel State Information Reference Symbol (CSI-RS) features that will be used by a wireless device is provided. The method includes at least one of selecting one or more CSI-RS feature sets; selecting one or more CSI-RS features in each of the selected CSI-RS feature sets; and selecting the maximum number of CSI-RS features in a CSI-RS feature set, the selection of the maximum number calculated to achieve a similarity between the numbers of CSI-RS features in the one or more CSI-RS feature sets.

[0047] According to another aspect, a base station for signaling the Channel State Information Reference Symbol (CSI-RS) features that will be used by a wireless device is provided. The base station includes a processing circuitry system configured to perform at least one of: selecting one or more CSI-RS feature sets; selecting one or more CSI-RS features in each of the selected CSI-RS feature sets; and selecting a maximum number of CSI-RS features in a CSI-RS feature set, the selection of the maximum number calculated to achieve a similarity between the numbers of CSI-RS features in the one or more CSI-RS feature sets.

[0048] According to yet another aspect, a method is provided for initiating channel state information feedback, CSI, in a wireless device configured by higher layers with a CSI Report that contains the parameters related to the CSI report. The method includes receiving a dynamic indication associated with a match between the CSI Report and the resources used for channel measurement.

[0049] According to another aspect, a method is provided, for a wireless device, to determine a set of symbol features. Petition 870250059249, dated 11 / 07 / 2025, p. 31 / 131 / 64, regarding channel state information, CSI-RS, referenced by a base station. The method includes determining a set of CSI-RS features based on an indication from a CSI report, the CSI report having a one-to-one match with respect to the set of CSI-RS features.

[0050] According to yet another embodiment, a wireless device is provided that is configured to initiate channel state information, CSI, feedback, the wireless device being configured by upper layers with a CSI Report containing the parameters related to the CSI report. The wireless device includes a receiver configured to receive a dynamic indication associated with a match between the CSI Report and the features used for channel measurement.

[0051] According to another aspect, a wireless device is provided for determining a set of features of the Channel State Information Reference Symbol, CSI-RS, indicated by a base station. The wireless device includes a processing circuitry system configured to determine a set of CSI-RS features based on an indication of a CSI report, the CSI report having a one-to-one correspondence with respect to the set of CSI-RS features. Brief Description of the Drawings

[0052] A fuller understanding of the present embodiments, and of the advantages and features thereof, will be more readily attained by reference to the following detailed description when considered in conjunction with the accompanying drawings, in which: Figure 1 is a temporal frequency grid of the features; Figure 2 is a radio panel; Figure 3 is an illustration of 3 OFDM symbols; Figure 4 is an illustration of spatial multiplexing; Figure 5A illustrates a first grid of the resource element; Figure 5B illustrates a second grid of the resource element; Petition 870250059249, dated 11 / 07 / 2025, page 32 / 131 / 64, figure 5C illustrates a third grid of the resource element; figure 6 illustrates the semi-persistent CSI-RS; Figure 7 illustrates an example of a CSI structure; Figure 8 is an example of the definition of a resource; Figure 9 is a block diagram of a wireless communication network configured according to the principles presented here; Figure 10 is a block diagram of a base station configured according to the principles presented here; Figure 11 is a block diagram of an alternative base station configuration; Figure 12 is a block diagram of a wireless device configured according to the principles presented here; Figure 13 is a block diagram of an alternative embodiment of the wireless device; Figure 14 is a flowchart of an exemplary process in a base station for the dynamic indication of CSI resources for a wireless device; Figure 15 is a flowchart of an exemplary process in a wireless device to determine a CSI-RS resource set indicated by a base station; and Figure 16 is a flowchart of an exemplary process for signaling CSI-RS resources from a base station that will be received and used by a wireless device; Figure 17 is a flowchart of an exemplary process for initiating CSI feedback in a wireless device; Figure 18 is a flowchart of an alternative exemplary process for initiating CSI feedback in a wireless device; Figure 19 is a flowchart of an exemplary process in a Petition 870250059249, dated 11 / 07 / 2025, page 33 / 131 / 64 wireless device to determine a set of features of the Channel State Information Reference Symbol, CSI-RS, indicated by a base station; Figure 20 is a graphical illustration of exemplary CSI-RS relationships; Figure 21 is a graphical illustration of the second exemplary CSI-RS relationships; Figure 22 is a graphical illustration of exemplary third CSI-RS relationships; and Figure 23 is a flowchart of an alternative exemplary process for initiating CSI feedback in a wireless device. Detailed Description

[0053] Before describing the exemplary modalities in detail, it is understood that the modalities reside primarily in the combinations of device components and processing steps related to dynamic indication for channel state information feedback (CSI). Therefore, the components have been represented, where appropriate, by conventional symbols in the drawings, showing only those specific details pertinent to understanding the modalities, so as not to obscure the description with details that will be readily apparent to those skilled in the art with the benefit of the description presented here. Here, the description also focuses on wireless transmissions in the downlink (DL), but the description and concepts provided here are equally applicable in the uplink (UL).

[0054] As used herein, relational terms such as “first” and “second”, “top” and “bottom”, and the like, may be used exclusively to distinguish one entity or element from another entity or element without necessarily requiring or implying any physical or logical relationship or order between such entities or elements. Petition 870250059249, dated 11 / 07 / 2025, p. 34 / 131 / 64 CSI Structure

[0055] The CSI structure agreed upon by NR allows for a wide variety of use cases, as well as the dynamic reuse of CSI resources. According to the agreed CSI structure, a WD can be configured by top layers with N > 1 CSI Report Definitions, M > 1 Resource Definitions, and 1 CSI Measurement Definition. The Measurement Definition includes L > 1 links, where each link connects a Report Definition with a Resource Definition. Figure 7 shows an example of the CSI structure agreed upon in NR, where N = 2, M = 4, and L = 5.

[0056] In each CSI Report Definition, a WD is configured (by higher layers) with parameters such as the reported CSI parameter(s), codebook configuration parameters (similar to those discussed in the section entitled 'Codebook-Based Channel State Information (CSI) Estimation and Feedback'), and the time-domain behavior (i.e., periodic, semi-persistent, or aperiodic) of the CSI report.

[0057] In each Resource Definition, a WD is configured (by higher layers) with a configuration of S > 1 CSI-RS Resource Sets. In each CSI-RS Resource Set s, the WD is additionally configured by higher layers with Ks > 1 CSI-RS resources, where the CSI-RS resources may have different mappings to the REs, different numbers of ports, and different time-domain behavior (i.e., periodic, semi-persistent, or aperiodic). An example of the Resource Definition with S = 2 CSI-RS Resource Sets is shown in Figure 8. In this example, the two CSI-RS Resource Sets consist of 4 CSI-RS resources each (i.e., Ki = 4 and K2 = 4). As seen in the example in Figure 8, the CSI-RS resources in each CSI-RS Resource Set have a mixed number of ports and time-domain behavior.

[0058] WD is then dynamically indicated with the following, if Petition 870250059249, dated 11 / 07 / 2025, page 35 / 131 / 64 applicable: * One or more CSI Reporting Definitions selected from the CSI Measurement Definition * One or more CSI-RS Feature Sets selected from at least one Feature Definition * One or more CSI-RS features selected from at least one CSI-RS feature set.

[0059] The different methods of dynamic indication are discussed below under the section entitled “Mechanisms for Control Signaling”. Mechanisms for Control Signaling

[0060] LTE control signaling can be conducted in a variety of ways, including conducting control information on the physical downlink control channel (PDCCH) or physical uplink control channel (PUCCH), embedded in the physical uplink shared channel (PUSCH), in the media access control (MAC) control elements (CEs MACs), or in the radio resource control (RRC) signaling. Each of these mechanisms is customized to conduct a particular type of control information.

[0061] Control information carried in PDCCH, PUCCH, or embedded in PUSCH is control information related to the physical layer, such as downlink control information (DCI), uplink control information (UCI), as described in 3GPP TS 36.211, 36.212, and 36.213. DCI is generally used to instruct the WD to perform some physical layer function, providing the necessary information to perform the function. UCI generally provides the network with necessary information, such as hybrid automatic repeat request acknowledgment (HARQ-ACK), scheduling request (SR), channel state information (CSI), including CQI, PMI, RI, and / or CRI. UCI and DCI can be transmitted on a subframe-by-subframe basis and then are Petition 870250059249, dated 11 / 07 / 2025, page 36 / 131 / 64 designed to support rapidly varying parameters, including those that may vary with a fading of the radio channel. Because the UCI and DCI can be transmitted in each subframe, the UCI or DCI corresponding to a given cell tends to be on the order of tens of bits, in order to limit the amount of control overprocessing.

[0062] Control information carried in MAC CEs is carried in MAC headers on shared uplink and downlink transport channels (UL-SCH and DL-SCH), as described in 3GPP TS 36.321. Since a MAC header does not have a fixed size, control information in MAC CEs can be sent when needed, and does not necessarily represent fixed overprocessing. Furthermore, MAC CEs can efficiently carry larger control payloads, as they are carried on UL-SCH or DL-SCH transport channels, which benefit from link adaptation, HARQ, and can undergo turbo coding. MAC CEs are used to perform repetitive tasks that use a fixed set of parameters, such as maintaining the synchronization advance state report or temporary storage, but these tasks generally do not require the transmission of a MAC CE on a subframe-by-subframe basis.Consequently, channel state information related to a radio channel fading, such as PMI, CQI, RI, and CRI, is not conducted on CE MACs in LTE up to Rel-14.

[0063] Consider a CSI structure with a Definition of Measurement consisting of N CSI Report Definitions, Resource Definitions with S CSI-RS Resource Sets, where each CSI-RS Resource Set consists of Ks CSI-RS resources. In this case, dynamic display to select one of the N CSI Report Definitions requires [log2(N)j bits. Dynamic display to select a CSI-RS Resource Set from among S CSI-RS Resource Sets requires [log2(S)j Petition 870250059249, dated 11 / 07 / 2025, page 37 / 131 / 64 bits. The dynamic indication to select one of the CSI-RS resources from Ks resources requires [log2(Ks)] bits. Therefore, the total number of bits required to select a CSI Report Definition, a CSIRS resource set, and a CSI-RS resource is [log2(N)j + [log2(S)j + [log2(Ks)] bits. This can amount to significant overprocessing of the control signaling for dynamic indication when the values ​​of N, S, and Ks are large. The overprocessing of the control signaling for dynamic indication will be even greater when multiple CSI Report Definitions, multiple CSI-RS Resource Sets, and multiple CSI-RS resources need to be selected.

[0064] Furthermore, not all CSI-RS features are compatible with all CSI Report Definitions. For example, a 4-port CSI-RS feature is not compatible with a CSI report that has a codebook configuration that supports 8 ports (i.e., the number of ports must be the same in the CSI-RS feature and the codebook configuration for them to be compatible). Moreover, the timing behavior (i.e., periodic, semi-persistent, aperiodic) of the CSI Report Definition needs to be compatible with the timing behavior of the CSI-RS feature. It should be noted that it is agreed that only certain combinations of the timing behavior of the CSI-RS feature and the CSI report are supported in NR (see Table 2). Therefore, it is an open problem how to efficiently configure the Measurement Definition to minimize control signal overprocessing for dynamic indication.

[0065] Another problem with the existing approach is that the WD needs to be dynamically indicated upon, i.e., informed of, the selection of three different entities (the three entities are CSI Report Definition, CSI-RS Resource Set, and CSI-RS Resources). This can make the design of the signaling for dynamic indication complicated. Petition 870250059249, dated 11 / 07 / 2025, page 38 / 131 / 64

[0066] In a first embodiment (Mode A, below), the control signaling required for dynamic indication is minimized by forming a one-to-one correspondence between a CSI Report Definition and a CSI-RS Resource Set contained in a Resource Definition to which the CSI Report is linked.

[0067] In a second embodiment (Effect B below), Report Subsets are created in each CSI Report Definition. The control signaling required for dynamic indication is minimized by forming a one-to-one correspondence between a Report Subset contained in a CSI Report Definition and a CSI-RS Resource Set contained in a Resource Definition to which the CSI Report is linked.

[0068] The advantages of the first approach may include simplified dynamic indication and minimized associated control signaling overprocessing. Due to the one-to-one correspondence between a CSI Report Definition and a CSIRS Resource Set, the selection of the CSI-RS Resource Set can be implicitly inferred from the dynamic indication of the CSI Report Definition. Therefore, only two different entities need to be dynamically indicated (the two entities are the CSI Report Definition and the CSI-RS resources). In terms of minimizing control signaling overprocessing, the total number of bits required to select a CSI Report Definition, a CSI-RS Resource Set, and a CSI-RS resource is flog2(N)] + flog2(Ks)] bits, where N is the number of CSI Report Definitions and Ks is the number of CSI-RS resources in the CSI-RS Resource Set Ks.Therefore, the number of bits for dynamic indication is reduced to flog2(S)] bits.

[0069] The advantages of the second mode may include that the associated control signaling overprocessing is minimized. Petition 870250059249, dated 11 / 07 / 2025, p. 39 / 131 / 64 Due to the one-to-one correspondence between a Report Subset and a CSI-RS Feature Set, the selection of the Report Subset can be implicitly inferred from the dynamic indication of the CSI-RS Feature Set and the dynamic indication of the CSI Report Definition. Since multiple Report Subsets are contained within a single CSI Report Definition, the number of bits required to dynamically indicate the CSI Report Definition can be minimized.

[0070] Figure 9 is a block diagram of a wireless communication network 10 constructed according to the principles presented here. The wireless communication network 10 includes a network cloud 16, which may include a public switched telephone network and / or the Internet, and may include a data concentration transfer network of the service provider. A first base station 20A and a second base station 20B, collectively referred to herein as the base stations 20, are in communication with the cloud 16 and may be in communication with each other. The base stations 20 may also be in communication with one or more wireless devices 40A and 40B, collectively referred to herein as WDs 40.Base stations 20 include a one-to-one matching establisher 30 that determines a one-to-one match between a CSI report definition and a CSI reference symbol (RS) feature set, and a one-to-one match between a report subset and a CSI-RS feature set. Additionally, WDs 40 include a CSI-RS feature determiner 50 that determines a CSI-RS feature set based on an indication of a CSI report definition and a report subset based on a CSI report and a CSI-RS feature set.

[0071] Figure 10 is a block diagram of a base station 20 configured according to the principles presented here. The base station 20 has a processing circuit system 22. In some embodiments, Petition 870250059249, dated 11 / 07 / 2025, page 40 / 131 / 64 the processing circuit system may include a memory 24 and a processor 26, the memory 24 containing the instructions which, when executed by the processor 26, configure the processor 26 to perform one or more of the functions described herein. In addition to a traditional processor and memory, the processing circuit system 22 may include the integrated circuit system for processing and / or control, for example, one or more processors and / or processor cores and / or FPGAs (Field Programmable Gate Arrays) and / or ASICs (Application-Specific Integrated Circuit Systems).

[0072] The processing circuit system 22 may include and / or be connected to and / or be configured to access (e.g., write to and / or read from) memory 24, which may include any type of volatile and / or non-volatile memory, for example, cache memory and / or temporary storage and / or RAM (random access memory) and / or ROM (read-only memory) and / or optical memory and / or EPROM (erasable programmable read-only memory). Such memory 24 may be configured to store executable code for the control circuit system and / or other data, for example, communication data, for example, configuration and / or address data of the nodes, etc. The processing circuit system 22 may be configured to control any of the methods described herein and / or to cause such methods to be performed, for example, by processor 26.The corresponding instructions can be stored in memory 24, which can be readable and / or readably connected in the processing circuit system 22. In other words, the processing circuit system 22 can include a controller, which can comprise a microprocessor and / or microcontroller and / or FPGA (field-programmable gate array) device and / or ASIC (application-specific integrated circuit) device. It can be considered that the processing circuit system 22 includes... Petition 870250059249, dated 11 / 07 / 2025, page 41 / 131 / 64 or it can be connected or connectable to memory, which can be configured to be accessible for reading and / or writing by the controller and / or the processing circuit system 22.

[0073] Memory 24 is configured to store CSI-RS feature information 28 which may include matching information regarding the match between a CSI report definition and a CSI reference symbol (RS) feature set and / or matching information regarding the match between a report subset and a CSI-RS feature set. Processor 26 is configured to implement a one-to-one matching establisher 30 that establishes the one-to-one match between a CSI report definition and a CSI reference symbol (RS) feature set and / or between a report subset and a CSI-RS feature set. A receiver 32 may receive channel quality measurements from one or more wireless devices 40. A transmitter 34 is configured to send, to the wireless device 40, an indication of the CSI report definition and CSI-RS features, in some modes.

[0074] Figure 11 is a block diagram of an alternative embodiment of base station 20 that has memory 24 configured to store CSI-RS information 28 and with an association module 31 to establish one of: a one-to-one correspondence between a CSI report definition and a CSI reference symbol (RS) feature set and a one-to-one correspondence between a report subset and a CSI-RS feature set.

[0075] When a one-to-one correspondence between a CSI report definition and a CSI Reference Symbol (RS) feature set is established, the CSI-RS feature set can be inferred on the wireless device 40 from a CSI report definition indication. Also, when a one-to-one correspondence between a Petition 870250059249, dated 11 / 07 / 2025, p. 42 / 131 / 64 If a reporting subset and a CSI-RS feature set are established, a reporting subset can be inferred on wireless device 40 from an indication of the CSI-RS feature set and an indication of the CSI reporting definition. Receiver module 33 is configured to receive channel quality measurements from wireless devices 40. Transmitter module 35 is configured to send to wireless device 40 an indication of the CSI reporting definition and CSI-RS features, in some modes.

[0076] Although the modalities are described here in relation to certain functions performed by base stations 20, it is understood that the functions can be performed at other nodes and network elements. It is also understood that the functions of base stations 20 or other network nodes can be distributed across the network cloud 16 so that other nodes can perform one or more functions or even parts of the functions described here.

[0077] Additionally, the term base station, for example, a Radio Base Station (RBS), may sometimes be referred to here, for example, as an evolved NodeB “eNB”, “eNodeB”, “NodeB”, “node B”, “gNB”, “gNodeB” or BTS (Base Transceiver Station), depending on the technology and terminology used. Base stations 20 can be of different classes, such as, for example, macro eNodeB, domestic eNodeB or pico base station, based on transmission power and thus also on cell size.A cell is the geographic area in which radio coverage is provided by base station 20 at a base station location. A base station 20, situated at the base station location, may serve one or more cells. Additionally, each base station 20 may support one or more communication technologies. Base stations 20 communicate via an air interface operating at radio frequencies with terminals within range of the base stations 20. In the context of this description, the term Downlink (DL) is used for the station's transmission path. Petition 870250059249, dated 11 / 07 / 2025, page 43 / 131 / 64 base 20 to WD 40. The term Uplink (UL) is used for the transmission path in the opposite direction, that is, from WD 40 to base station 20.

[0078] In the Long Term Evolution (LTE) of the 3G Generation Partnership Project (3GPP), base stations, which may be referred to as eNodeBs or eNBs, or in 5G and NR, base stations, which may be referred to as gNodeBs or gNBs, may be directly connected to one or more core networks. Additionally, although the modalities are described in relation to base stations, it is understood that the modalities may be implemented on or through any suitable network node, of which base stations 20 are one type. Also, it is also understood that the functions of base station 20 or other network nodes may be distributed across the network cloud 16, so that other nodes may perform one or more functions, or even parts of the functions, as described herein.

[0079] Figure 12 is a block diagram of the WD 40. The WD 40 has the processing circuit system 42. In some embodiments, the processing circuit system may include a memory 44 and a processor 46, the memory 44 containing the instructions which, when executed by the processor 46, configure the processor 46 to perform one or more of the functions described herein. In addition to a traditional processor and memory, the processing circuit system 42 may comprise the integrated circuit system for processing and / or controlling, for example, one or more processors and / or processor cores and / or FPGAs (field-programmable gate arrays) and / or ASICs (application-specific integrated circuit systems).

[0080] The processing circuit system 42 may include and / or be connected to and / or be configured to access (e.g., write to and / or read from) memory 44, which may include any type of volatile and / or non-volatile memory, e.g., cache and / or storage memory. Petition 870250059249, dated 11 / 07 / 2025, page 44 / 131 / 64 temporary and / or RAM (random access memory) and / or ROM (read-only memory) and / or optical memory and / or EPROM (erasable programmable read-only memory). Such memory 44 may be configured to store executable code by the control circuit system and / or other data, for example, communication data, for example, configuration and / or address data of the nodes, etc. The processing circuit system 42 may be configured to control any of the methods described herein and / or to cause such methods to be performed, for example, by the processor 46. The corresponding instructions may be stored in memory 44, which may be readable and / or readably connected in the processing circuit system 42.In other words, the processing circuit system 42 may include a controller, which may comprise a microprocessor and / or a microcontroller and / or an FPGA (field-programmable gate array) device and / or an ASIC (application-specific integrated circuit) device. It can be considered that the processing circuit system 42 includes, or may be connected to or connectable to, memory, which may be configured to be accessible for reading and / or writing by the controller and / or the processing circuit system 42.

[0081] Memory 44 is configured to store CSI-RS resource information 48 which may include an indication of a CSI report definition, a CSI report, and a CSI-RS resource set. Processor 46 is configured to implement a CSI-RS resource determiner 50 to determine one of a CSI-RS resource set based on an indication of a CSI report definition and a report subset based on a CSI report and a CSI-RS resource set. In some embodiments, the CSI report definition has a one-to-one correspondence with respect to a CSI-RS resource set, and the CSI-RS resource set has a one-to-one correspondence. Petition 870250059249, dated 11 / 07 / 2025, page 45 / 131 / 64 for one in relation to a set of reports. Receiver 52 is configured to receive from the base station an indication of the CSI report definition and CSI-RS features, in some modes. Transmitter 54 is configured to transmit channel quality measurements to base station 20.

[0082] Figure 13 is a block diagram of an alternative embodiment of the wireless device 40 which has memory 44, a determination module 51, a receiver module 53 and a transmitter module 55. Memory module 44 stores the CSI-RS feature information 48. Determination module 51 is configured to determine one of a set of CSI-RS features based on an indication of a CSI report definition and a report subset based on a CSI report and a set of CSI-RS features. Receiver module 53 is configured to receive from the base station an indication of the CSI report definition and CSI-RS features, in some embodiments. Transmitter module 55 is configured to transmit channel quality measurements to base station 20.

[0083] In some embodiments, a non-limiting term “wireless device” is used. Wireless device 40, herein, may be any type of wireless device capable of communicating with a network entity, such as a base station 20 or another wireless device 40, such as user equipment (UE), via radio signals. Wireless device 40 may also be a radio communication device, a target device, a device-to-device (D2D) wireless device, a machine-type wireless device or a machine-to-machine (M2M) wireless device, a sensor equipped with a wireless device, an iPad, a tablet, mobile terminals, a smartphone, laptop embedded equipment (LEE), laptop mounted equipment (LME), USB dongles, equipment on Petition 870250059249, dated 11 / 07 / 2025, p. 46 / 131 / 64 Consumer Dependencies (CPE), etc.

[0084] Figure 14 is a flowchart of an exemplary process for use in a base station 20 that uses control signaling for the dynamic indication of channel state information (CSI) resources to a wireless device 40. In a first case, a one-to-one correspondence between a CSI report definition and a CSI-RS resource set is established so that the CSI-RS resource set can be determined in the wireless device 40 from an indication of the CSI report definition (block S100). In some embodiments, an indication of the CSI report definition and the CSI-RS resources is sent to the wireless device 40 via transmitter 34 (block S102).

[0085] Figure 15 is a flowchart of an exemplary process in a wireless device 40 for determining a CSI-RS feature set indicated by a base station. The process includes determining, by means of the determiner 50, a CSI-RS feature set that is determined based on an indication of a CSI report definition, the CSI report definition having a one-to-one correspondence with respect to a CSI-RS feature set (block S104). In some embodiments, an indication of the CSI report definition and the CSI-RS features are received by means of the receiver 52 (block S110).

[0086] Figure 16 is a flowchart of an exemplary process for signaling the CRS-RS resources that will be used by a wireless device 40. The process includes selecting, via the processing circuit system 22, one or more sets of CSI-RS resources (block S108). The process also includes selecting, via the processing circuit system 22, one or more CSI-RS resources in each of the selected sets of CSI-RS resources (block S110). The process also includes selecting, via the processing circuit system 22, the maximum number of CSI-RS resources in a set of CSI-RS resources, a Petition 870250059249, dated 11 / 07 / 2025, page 47 / 131 / 64 selection of the maximum number calculated to achieve similarity between the CSI-RS feature numbers in one or more CSIRS feature sets (block S112).

[0087] Figure 17 is a flowchart of an exemplary process that is provided to initiate CSI feedback on a wireless device 40 configured by upper layers with a CSI Report containing the parameters related to the CSI report. The process includes receiving a dynamic indication associated with a match between the CSI Report (or the CSI Report configuration) and the resources used for channel measurement (block S114).

[0088] Figure 18 is a flowchart of an exemplary process that is provided to initiate channel state information feedback, CSI, in a wireless device 40 configured by upper layers with at least one of M Report Definitions containing the parameters related to CSI reporting and N Resource Definitions containing the parameters that define the resources used for channel measurement and their properties. The process includes receiving a dynamic indication associated with a match between the Resource Definition and the Report Definitions (block S116).

[0089] Figure 19 is a flowchart of an exemplary process that is provided in a wireless device 40 for determining a set of features of the Channel State Information Reference Symbol, CSI-RS, indicated by a base station 20. The process involves determining a set of CSI-RS features based on an indication of a CSI report (or CSI Report configuration), the CSI report (or CSI Report configuration) having a one-to-one correspondence with respect to the CSI-RS feature set (block S118). According to this aspect, in some embodiments, the CSI-RS feature set includes the features used for channel measurement. Petition 870250059249, dated 11 / 07 / 2025, p. 48 / 131 / 64

[0090] In some modes, the matches referred to here are configured in RRC. Furthermore, in some modes, by dynamically triggering a CSI report, the CSI resources are automatically triggered, given the configured match(es). Mode A

[0091] In Mode A, each Resource Definition in a WD is configured in such a way that the CSI-RS resource sets in the Resource Definition contain CSI-RS resources with the same configuration parameters (e.g., the same number of ports and the same time-domain behavior, i.e., periodic, semi-persistent, aperiodic CSI-RS resources). Figure 20 shows an example of this mode where Resource Definition 0 contains S = 3 different CSI-RS resource sets. Each of the three CSI-RS resource sets has CSI-RS resources with the same configuration parameters. For example, CSI-RS Resource Set 0 contains 2 CSI-RS resources, both with 4 ports and aperiodic time-domain behavior, CSI-RS Resource Set 1 contains 2 CSI-RS resources, both with 8 ports and semi-persistent time-domain behavior, etc.

[0092] Furthermore, in Mode A, a Resource Definition containing S different CSI-RS resource sets is linked to S CSI Report Definitions, where the s-th CSI Report Definition corresponds to the s-th CSI-RS Resource Set in the Resource Definition. The CSI Report Definition - CSI-RS Resource Set pair that corresponds to each other has compatible parameter settings. In the example in Figure 20, CSI-RS Report Definition 2 with a 32-port codebook configuration corresponds to CSI-RS Resource Set 2 containing the 32-port CSI-RS resources. Furthermore, CSI-RS Report Definition 2 is aperiodic and the Resource Set Petition 870250059249, dated 11 / 07 / 2025, p. 49 / 131 / 64 The CSI-RS 2 resource also contains the aperiodic CSI-RS resources. Therefore, the CSI-RS 2 Report Definition is compatible with the CSI-RS 2 Resource Set in terms of both the number of ports and the time-domain behavior. Even though this example illustrates compatibility in terms of the number of ports and time-domain behavior, the notion of compatibility between a CSI-RS report definition and the CSI-RS Resource Set in Mode A can also be easily extended in terms of other parameters.

[0093] The advantages of Mode A may include simplified dynamic indication and minimized associated control signaling overprocessing. Due to the one-to-one correspondence between a CSI Report Definition and a CSI-RS Resource Set, the selection of the CSI-RS Resource Set can be implicitly inferred from the dynamic indication of the CSI Report Definition. Therefore, only two different entities need to be dynamically indicated (the two entities are CSI Report Definition and CSI-RS resources). In terms of minimizing control signaling overprocessing, the total number of bits required for selection in the CSI Report Definition, a CSI-RS Resource Set, and a CSI-RS resource is [log2(N)j + [log2(Ks)] bits, where N is the number of CSI Report Definitions and Ks is the number of CSI-RS resources in the CSI-RS Resource Set Ks.Therefore, the number of bits for dynamic indication is reduced by [log2(S)j bits.

[0094] In some modes, DCI signaling is used for dynamic indication. In some other modes, CE MAC is used for dynamic signaling.

[0095] Optionally, in a variant of Mode A, CSI-RS resources in the same CSI-RS Resource Set may have the same configuration for only a subset of the parameters. In the example in Figure 21, the CSI Report Definition 1 with a configuration Petition 870250059249, dated 11 / 07 / 2025, p. 50 / 131 / 64 of the 8-port codebook corresponds to CSIRS Resource Set 1, which contains the 8-port CSI-RS resources. However, the time-domain behavior of the two resources in CSI-RS Resource Set 1 is different (i.e., one CSI-RS resource is aperiodic, while the other is semi-persistent). Although the two CSI-RS resources in CSI-RS Resource Set 1 have different time-domain behavior, they are both compatible with the time-domain behavior of the CSI Reporting Definition 1 (recall Table 2 where both aperiodic and semi-persistent CSI-RS are compatible with the Aperiodic CSI Reporting Definition). In this case, which type of CSI-RS feature to use (i.e., Aperiodic or Semi-persistent) can be determined by dynamic indication. Mode B

[0096] In Mode B, a Resource Definition containing S different CSI-RS resource sets is linked to a CSI Report Definition. The CSI Report Definition linked to the Resource Definition contains S different Report subsets. The s-th Report Subset in the CSI Report Definition corresponds to the s-th CSI-RS Resource Set in the Resource Definition. In the example in Figure 22, Report Subset 2 with a codebook configuration of 32 ports corresponds to CSI-RS Resource Set 2 which contains the 32-port CSI-RS resources. Furthermore, Report Subset 2 is aperiodic and CSI-RS Resource Set 2 also contains the aperiodic CSI-RS resources. Therefore, Report Subset 2 is compatible with CSI-RS Resource Set 2 in terms of both the number of ports and the time-domain behavior.Even though this example illustrates compatibility in terms of the number of ports and behavior in the time domain, the notion of compatibility between a Report Subset and a CSI-RS Feature Set in the Modality. Petition 870250059249, dated 11 / 07 / 2025, p. 51 / 131 / 64 B can also be easily extended in terms of other parameters.

[0097] One advantage of Mode B may be that this mode minimizes the associated control signaling overprocessing. Due to the one-to-one correspondence between a Report Subset and a CSI-RS Resource Set, the selection of the Report Subset can be implicitly inferred from the dynamic indication of the CSI-RS Resource Set and the dynamic indication of the CSI Report Definition. Since multiple Report Subsets are contained within a single CSI Report Definition, the number of bits required to dynamically indicate the CSI Report Definition can be minimized, compared to a case where four entities (CSI Report Definition, Report Subsets, CSI-RS Resource Set, and CSI-RS resources) are all dynamically indicated explicitly.

[0098] In some modes, DCI signaling is used for dynamic indication. In some other modes, CE MAC is used for dynamic signaling. Mode C

[0099] Note that multiple CSI-RS resource sets can be configured for a wireless device 40, and for each CSI-RS resource set, there can be multiple CSI-RS resources. In Mode C, one or more CSI-RS resource(s) is / are selected, first by selecting a CSI-RS resource set and then by selecting one or more CSI-RS resources in the selected set. Since the number of bits required for resource selection needs to be drawn according to the number of CSI-RS resource sets and the maximum number of CSI-RS resources in a set, for efficient dynamic signaling / indication, the number of CSI-RS resources in each of the CSI-RS resource sets should be as similar as possible. For example, if there are four CSI-RS resource sets, the first set has 16 CSI resources. Petition 870250059249, dated 11 / 07 / 2025, page 52 / 131 / 64 Since the other three CSI-RS feature sets have 4 features each (i.e., a total of 28 features), a total of 6 bits is required to select a CSI-RS feature; that is, 2 bits for selecting the CSI-RS feature set and 4 bits for selecting the CSI-RS feature within the selected set. On the other hand, if the 28 CSI-RS features are in two CSI-RS feature sets, each with 14 CSI-RS features, then only 5 bits will be needed.

[00100] In another embodiment, each CSIRS resource set can contain CSI-RS resources with a different number of antenna ports, and with different time domain behavior, i.e., they can be periodic or aperiodic CSI-RS resources. Multiple CSI Report Definitions can be dynamically associated with a CSI-RS resource set and one or more CSI-RS resources in the selected CSI-RS resource set. An example is shown in TABLE 3, where three CSI-RS resource sets are configured for a wireless device 40. In the first set, the UE is configured with six 8-port CSI-RS resources and one 32-port CSI-RS resource, and the CSI-RS resources have different time domain behavior. This can be used to support hybrid CSI reporting, where periodic CSI is reported using 32-port CSI-RS resource #5.Aperiodic CSI reporting can also be done for 32 ports using feature #5. Aperiodic CSI reporting for 8 ports can use any of the four 8-port CSI-RS features, that is, features #0 to #3 in the dynamically selected CSI-RS feature set #0, or use the 8-port semi-persistent CSI-RS feature set #4. CSI-RS feature sets #1 and #2 can be used to perform CSI reporting from other TRPs in a CoMP broadcast scheme.

[00101] In some cases, CSI-RS features in a full CSI-RS feature set may be selected to report the best Petition 870250059249, dated 11 / 07 / 2025, p. 53 / 131 / 64 CSI is defined as either the best received CSI values ​​(RSRPs) among all CSI values ​​measured across all CSI-RS features or the best received Ω reference signal powers (RSRPs). Here, each RSRP corresponds to one of the CSI-RS features in the selected CSI-RS feature set.

[00102] The number of CSI-RS feature sets, as well as the maximum number of CSI-RS features in each CSI-RS feature set, can be semi-statically configured so that the number of bits used in the dynamic indication for CSI-RS feature selection can be minimized according to each implementation scenario. TABLE 3 CSI-RS resource set 0 CSI-RS resource index 0 1 2 3 4 5 8 ports 8 ports 8 ports 8 ports 8 ports 32 ports aperiodic aperiodic aperiodic aperiodic semi-persistent periodic CSI-RS resource set 1 CSI-RS resource index 0 1 2 3 4 5 2 ports 2 ports 2 ports 2 ports 2 ports 8 ports aperiodic aperiodic aperiodic aperiodic semipersistent periodic CSI-RS resource set 3 CSI-RS resource index 0 1 2 3 4 5 4 ports 4 ports 4 ports 4 ports 4 ports 16 ports aperiodic aperiodic aperiodic aperiodic semipersistent periodic

[00103] Figure 23 is a flowchart of an alternative exemplary process for initiating CSI feedback on a wireless device configured by upper layers with M Report Definitions containing the parameters related to CSI reporting and N Resource Definitions containing the parameters that define the resources used for channel measurement and their properties. The process includes performing at least one of the following steps: obtaining the preconfigured links between the Report Definitions and the Resource Definitions via the upper layer configuration (S120); determining S CSI-RS Resource Sets in each Resource Definition based on the upper layer configuration where a CSI-RS Resource Set contains multiple CSI-RS resources used for channel measurement (S122); receiving via the configuration of Petition 870250059249, dated 11 / 07 / 2025, p. 54 / 131 / 64 upper layer a preconfigured match between one of the CSI-RS Resource Sets in one of the Resource Definitions and a part or the whole of a CSI Report Definition that is linked in the Resource Definition using parameter configuration compatibility (S124); and receive a dynamic indication associated with the match between the CSI-RS Resource Set and the CSI Report Definition (S126).

[00104] Thus, some modalities include a method of initiating channel state information feedback, CSI, in a wireless device configured by higher layers with M Report Definitions that contain the parameters related to CSI reporting and N Feature Definitions that contain the parameters that define the features used for channel measurement and their properties.The method includes a) obtaining the preconfigured links between the Report Definitions and the Resource Definitions through the upper-layer configuration (S120); b) determining S CSI-RS Resource Sets in each Resource Definition based on the upper-layer configuration where a CSI-RS Resource Set contains multiple CSI-RS resources used for channel measurement (S122); c) receiving through the upper-layer configuration a preconfigured match between one of the S CSI-RS Resource Sets in one of the Resource Definitions and a part or the whole of a CSI Report Definition that is linked in the Resource Definition using parameter configuration compatibility (S124); and d) receiving a dynamic indication associated with the match between the CSI-RS Resource Set and the CSI Report Definition (S126).

[00105] According to this aspect, in some modalities, a codebook configuration and one or more related parameters defined in the Report Definition are compatible with a number of ports in the CSI-RS resources contained in a CSI-RS Resource Set. In Petition 870250059249, dated 11 / 07 / 2025, p. 55 / 131 / 64 In some modes, a behavior in the time domain defined in the Report Definition is compatible with a behavior in the time domain in the CSI-RS resources contained in the CSI-RS Resource Set. In some modes, the dynamic indication is given by DCI. In some modes, the dynamic indication is given by CE MAC. In some modes, the number of Report Definitions M linked in a Resource Definition (N = 1) is defined equal to the number of CSI-RS Resource Sets S in a Resource Definition. In some modes, the entirety of a Report Definition corresponds to only one CSI-RS Resource Set. In some modes, the dynamically indicated entities explicitly include a selection of one or more CSI Report Definition(s) and a selection of one or more CSI-RS resources.In some modes, the CSI-RS Resource Set indication is implicitly given by the dynamic indication of the CSI Report Definition(s) selection. In some modes, a Report Definition (M = 1) is linked to a Resource Definition (N = 1) that contains S CSI-RS Resource Sets.

[00106] According to another aspect, a method, for a wireless device 40, for determining a feature set of the channel status information reference symbol, CSI-RS, indicated by a base station 20 is provided. The method includes determining a CSI-RS feature set based on an indication of a CSI report definition (S118), the CSI report definition having a one-to-one correspondence with respect to a CSI-RS feature set.

[00107] According to this aspect, in some embodiments, the method additionally includes receiving, from the base station, an indication of the definition of the CSI report and the CSI-RS resources in the CSI-RS resource set. In some embodiments, a resource set is unique to at least one of a number of antenna ports and a Petition 870250059249, dated 11 / 07 / 2025, p. 56 / 131 / 64, concerns the time domain behavior of features in the CSI-RS feature set. In some embodiments, an integer number of different CSI-RS feature sets are linked in a CSI report definition. In some embodiments, the CSI-RS feature set includes the features used for channel measurements.

[00108] According to another aspect, a wireless device 40 is provided that initiates channel state information feedback, CSI, in a wireless device configured by upper layers with M Report Definitions containing the parameters related to CSI reporting and N Resource Definitions containing the parameters that define the resources used for channel measurement and their properties, the wireless device 40 comprising a processing circuit system 42 configured to perform at least one of: a) obtaining the preconfigured links between the Report Definitions and the Resource Definitions through the upper layer configuration; b) determining S CSI-RS Resource Sets in each Resource Definition based on the upper layer configuration where a CSI-RS Resource Set contains multiple CSI-RS resources used for channel measurement;c) receive, through the top-layer configuration, a preconfigured match between a CSI-RS Resource Set in a Resource Definition and a part or all of a CSI Report Definition that is linked in the Resource Definition using parameter configuration compatibility; and d) receive a dynamic indication associated with the match between the CSI-RS Resource Set and the CSI Report Definition.

[00109] According to this aspect, a codebook configuration and one or more related parameters defined in the Report Definition are compatible with a number of ports on the CSI-RS resources contained in a CSI-RS Resource Set. In some embodiments, a time-domain behavior defined in the Report Definition is Petition 870250059249, dated 11 / 07 / 2025, p. 57 / 131 / 64 compatible with time-domain behavior in CSI-RS resources contained in the CSI-RS Resource Set. In some modes, the dynamic indication is given by DCI. In some modes, the dynamic indication is given by CE MAC. In some modes, the number of Report Definitions M linked in a Resource Definition (N = 1) is set equal to the number of CSI-RS Resource Sets S in a Resource Definition. In some modes, the entirety of a Report Definition corresponds to only one CSI-RS Resource Set. In some modes, the dynamically indicated entities explicitly include a selection of one or more CSI Report Definition(s) and a selection of one or more CSI-RS resources. In some modes, the CSI-RS Resource Set indication is implicitly given by the dynamic indication of the CSI Report Definition(s) selection.In some modes, a Report Definition (M = 1) is linked to a Resource Definition (N = 1) that contains S CSI-RS Resource Sets.

[00110] According to yet another aspect, a wireless device 40 is provided for determining the features of the channel status information reference symbol, CSI-RS, indicated by a base station 20, the wireless device 40 comprising a processing circuit system 42 configured to determine a CSI-RS feature set based on an indication of a CSI report definition, the CSI-RS report definition having a one-to-one correspondence with respect to a CSI-RS feature set.

[00111] According to this aspect, in some embodiments, the wireless device additionally includes a receiver 52 configured to receive, from the base station 20, an indication of the CSI report definition and CSI-RS features. In some embodiments, an integer number of different CSI-RS feature sets are linked in a definition of Petition 870250059249, dated 11 / 07 / 2025, p. 58 / 131 / 64, CSI report. In some embodiments, a feature set is unique to at least one of a number of antenna ports and to a particular time-domain behavior of the features in the set. In some embodiments, the CSI-RS feature set includes the features used for channel measurements.

[00112] According to yet another aspect, a wireless device (40) for determining the channel state information reference symbol, CSI-RS, features indicated by a base station 20 is provided. The wireless device 40 includes a determination module (51) for determining a CSI-RS feature set based on an indication of a CSI report definition, the CSI-RS report definition having a one-to-one correspondence with respect to a CSI-RS feature set.

[00113] According to another aspect, a method for a base station 20 is provided. The method includes sending to the wireless device 40 a dynamic indication of a CSI report definition and one or more CSI-RS features, wherein a one-to-one correspondence between a CSI report definition and a CSI reference symbol, RS, feature set is established (S102A).

[00114] According to this aspect, in some embodiments, the total number of bits that will be sent to indicate a CSI report definition and a CSI-RS feature is [log2(N)j + [log2(Ks)] bits, where N is the number of CSI Report Definitions and Ks is the number of CSIRS features. In some embodiments, an integer number of different CSI-RS feature sets are linked in a CSI report definition. In some embodiments, a feature set is unique to at least one of a number of antenna ports and to a particular time-domain behavior of the features in the set.

[00115] According to another aspect, a base station 20 that uses control signaling for the dynamic indication of resources of Petition 870250059249, dated 11 / 07 / 2025, p. 59 / 131 / 64, provides channel state information (CSI) for a wireless device 40. Base station 20 includes a processing circuit system configured to send to wireless device 40 an indication of the CSI report definition and CSI-RS features, wherein a one-to-one correspondence between a CSI report definition and a CSI RS reference symbol feature set is established.

[00116] According to this aspect, in some embodiments, the total number of bits that will be sent to indicate a CSI report definition and a CSI-RD feature is [log2(N)j + [log2(Ks)] bits, where N is the number of CSI Report Definitions and Ks is the number of CSIRS features. In some embodiments, an integer number of different CSI-RS feature sets are linked in a CSI report definition. In some embodiments, a feature set is unique in at least one of a number of antenna ports and in a particular time domain behavior of the features in the set.

[00117] According to yet another aspect, a base station 20 for signaling the Channel State Information Reference Symbol, CSI-RS, features that will be used by a wireless device 40 is provided. The method includes at least one of selecting one or more CSI-RS feature sets; selecting one or more CSI-RS features in each of the selected CSI-RS feature sets; and selecting the maximum number of CSI-RS features in a CSI-RS feature set, the selection of the maximum number calculated to achieve a similarity between the numbers of CSI-RS features in the one or more CSI-RS feature sets.

[00118] According to another aspect, a base station 20 for signaling the channel status information reference symbol, CRS-RS, resources that will be used by a wireless device 40 is provided. The base station 20 includes a processing circuit system 22 Petition 870250059249, dated 11 / 07 / 2025, p. 60 / 131 / 64 configured to perform at least one of: selecting one or more CSI-RS feature sets; selecting one or more CSI-RS features in each of the selected CSI-RS feature sets; and selecting a maximum number of CSI-RS features in a CSI-RS feature set, the selection of the maximum number calculated to achieve similarity between the numbers of CSI-RS features in one or more CSI-RS feature sets.

[00119] According to yet another aspect, a method for initiating channel state information feedback, CSI, in a wireless device configured by higher layers with a CSI Report containing parameters related to the CSI report is provided. The method includes receiving a dynamic indication associated with a match between the CSI Report and the resources used for channel measurement.

[00120] According to another aspect, a method is provided, for a wireless device, to determine a set of features of the Channel State Information Reference Symbol, CSI-RS, indicated by a base station. The method includes determining a set of CSI-RS features based on an indication of a CSI report, the CSI report having a one-to-one correspondence with respect to the set of CSI-RS features.

[00121] According to this aspect, in some embodiments, the CSI-RS feature set includes the features used for channel measurement. In some embodiments, a codebook configuration and one or more related parameters defined in the Report Definition are compatible with a number of ports in the CSI-RS features contained in a CSI-RS Feature Set. In some embodiments, a time-domain behavior defined in the Report Definition is compatible with a time-domain behavior in the CSI-RS features contained in the CSI-RS Feature Set. In some Petition 870250059249, dated 11 / 07 / 2025, p. 61 / 131 / 64 modes, the dynamic indication is given by DCI. In some modes, the dynamic indication is given by CE MAC. In some modes, a feature set is unique to at least one of a number of antenna ports and to a particular time-domain behavior of the features in the set.

[00122] According to yet another aspect, a user device 40 that initiates channel state information feedback, CSI, in a user device configured by higher layers with M Report Definitions containing the parameters related to CSI reporting and N Resource Definitions containing the parameters that define the resources used for channel measurement and their properties is provided.User equipment 40 includes a processing circuit system 42 configured to perform at least one of: a) obtaining preconfigured links between Report Definitions and Resource Definitions via the upper-layer configuration (S120); b) determining CSI-RS Resource Sets in each Resource Definition based on the upper-layer configuration where a CSI-RS Resource Set contains multiple CSI-RS resources used for channel measurement (S122); c) receiving via the upper-layer configuration a preconfigured match between a CSI-RS Resource Set in a Resource Definition and a part or the whole of a CSI Report Definition that is linked in the Resource Definition using parameter configuration compatibility (S124); and d) receiving a dynamic indication associated with the match between the CSI-RS Resource Set and the CSI Report Definition (S126).

[00123] According to this aspect, in some modalities, a codebook configuration and one or more related parameters defined in the Report Definition are compatible with a number of ports in the CSI-RS resources contained in a CSI-RS Resource Set. In Petition 870250059249, dated 11 / 07 / 2025, p. 62 / 131 / 64 In some modes, a behavior in the time domain defined in the Report Definition is compatible with a behavior in the time domain in the CSI-RS resources contained in the CSI-RS Resource Set. In some modes, the dynamic indication is given by DCI. In some modes, the dynamic indication is given by CE MAC. In some modes, the number of Report Definitions M linked in a Resource Definition (N = 1) is defined equal to the number of CSI-RS Resource Sets S in a Resource Definition. In some modes, the entirety of a Report Definition corresponds to only one CSI-RS Resource Set. In some modes, the dynamically indicated entities explicitly include a selection of one or more CSI Report Definition(s) and a selection of one or more CSI-RS resources.In some modes, the indication of the CSI-RS Resource Set is implicitly given by the dynamic indication of the selection of CSI Report Definition(s). In some modes, a Report Definition (M = 1) is linked to a Resource Definition (N = 1) that contains S CSI-RS Resource Sets.

[00124] According to another aspect, a user equipment 40 for determining the channel status information reference symbol, CSI-RS, features indicated by a base station 20 is provided. The user equipment 40 includes a processing circuit system 42 configured to determine a CSI-RS feature set based on an indication of a CSI report definition, the CSI-RS report definition having a one-to-one correspondence with respect to a CSI-RS feature set.

[00125] In accordance with this aspect, in some embodiments, the user equipment 40 additionally includes a receiver configured to receive, from the base station 20, an indication of the CSI report definition and CSI-RS capabilities. In some embodiments, a number Petition 870250059249, dated 11 / 07 / 2025, p. 63 / 131 / 64. The entirety of different CSI-RS feature sets is linked in a CSI report definition. In some embodiments, a feature set is unique to at least one of a number of antenna ports and to a particular time-domain behavior of the features in the set. In some embodiments, the CSI-RS feature set includes the features used for channel measurements.

[00126] According to yet another aspect, a user device 40 for determining the channel status information reference symbol, CSI-RS, features indicated by a base station 20 is provided. The user device 40 includes a determination module 51 for determining a CSI-RS feature set based on an indication of a CSI report definition, the CSI-RS report definition having a one-to-one correspondence with respect to a CSI-RS feature set.

[00127] According to yet another embodiment, a wireless device is provided configured to initiate channel state information feedback, CSI, the wireless device being configured by upper layers with a CSI Report containing the parameters related to the CSI report. The wireless device includes a receiver 52 configured to receive a dynamic indication associated with a match between the CSI Report and the resources used for channel measurement.

[00128] According to another aspect, a wireless device 40 is provided for determining a set of features of the Channel State Information Reference Symbol, CSI-RS, indicated by a base station. The wireless device includes a processing circuitry system 42 configured to determine a set of CSI-RS features based on an indication of a CSI report, the CSI report having a one-to-one correspondence with respect to the set of CSI-RS features.

[00129] Some options include the following: Petition 870250059249, dated 11 / 07 / 2025, p. 64 / 131 / 64 Mode 1. A method for initiating CSI feedback in a wireless device configured by higher layers with M Report Definitions containing the parameters related to CSI reporting and N Feature Definitions containing the parameters that define the features used for channel measurement and their properties, the method comprising at least one of: a) Obtain the pre-configured link between the Reporting Definitions and the Resource Definitions, b) Determine S sets of CSI-RS features in each feature definition where a CSI-RS feature set contains multiple CSI-RS features used for channel measurement, c) Obtain a preconfigured match between a CSI-RS Resource Set in a Resource Definition and a portion or all of a CSI Report Definition that is linked in the Resource Definition using parameter configuration compatibility, and d) Receive dynamic indication that exploits the correspondence between the CSI-RS Resource Set and the CSI Report Definition to reduce control signal overprocessing.

[00130] Note: In some cases, the information in steps (a)-(c) exposed may be part of the upper layer configuration.

[00131] Mode 2. The method of Mode 1, in which the number of Report Definitions M linked in a Resource Definition (N = 1) is set equal to the number of CSI-RS Resource Sets S in a Resource Definition.

[00132] Modality 3. The method, of any of the Modalities 1, 2A and 2B, in which the entirety of a Report Definition corresponds to only one CSI-RS Resource Set.

[00133] Mode 4. The method, of any of the Modes 13, in which the codebook configuration and related parameters Petition 870250059249, dated 11 / 07 / 2025, p. 65 / 131 / 64 defined in the Report Definition are compatible with the number of ports in the CSI-RS resources contained in the CSI-RS Resource Set.

[00134] Modality 5. The method, of any of the Modalities 1- 3, where a behavior in the time domain defined in the Report Definition is compatible with a behavior in the time domain in the CSI-RS resources contained in the CSI-RS Resource Set.

[00135] Mode 6. The method, of any of the Modes 13, in which the dynamically indicated entities explicitly include a selection of one or more CSI Report Definition(s) and a selection of one or more CSI-RS features.

[00136] Mode 7. The method, of either Mode 13 or 6, in which the indication of the CSI-RS Resource Set is implicitly given by the dynamic indication of the selection of CSI Report Definition(s).

[00137] Mode 8. The method, of either of Modes 13 and 6, in which the dynamic indication is given by DCI.

[00138] Mode 9. The method, of either Mode 13 or 6, in which the dynamic indication is given by CE MAC.

[00139] Mode 10. The Mode 1 method, in which a Report Definition (M = 1) is linked to a Resource Definition (N = 1) that contains S CSI-RS Resource Sets.

[00140] Mode 11. The method, of either Mode 1 or 10, where the Report Definition contains S Report Subsets.

[00141] Mode 12. The method, of any of the Modes 1, 10 and 11, where a Report Subset that is part of the Report Definition corresponds to only one CSI-RS Resource Set.

[00142] Mode 13. The method, of either Mode 1 or 10-12, in which the codebook configuration and related parameters defined in the Reporting Subset are compatible with the Petition 870250059249, dated 11 / 07 / 2025, p. 66 / 131 / 64 number of ports in the CSI-RS resources contained in the CSI-RS Resource Set.

[00143] Mode 14. The method, of either Mode 1 or 10-12, in which a behavior in the time domain defined in the Reporting Subset is compatible with a behavior in the time domain in the CSI-RS features contained in the CSI-RS Feature Set.

[00144] Mode 15. The method, of either Mode 1 or 10-12, in which the dynamically indicated entities explicitly include a selection from the CSI Report Definition, a selection from one or more CSI-RS Feature Set(s), and a selection from one or more CSI-RS features.

[00145] Modality 16. The method, of any of the Modalities 1, 10-12 and 15, in which the indication of the Report Subset is implicitly given by the dynamic indication of the CSI Report Definition selection and the CSI-RS Resource Set(s) selection.

[00146] Mode 17. The method, of either Mode 1 or 10-12, in which the dynamic indication is given by DCI.

[00147] Modality 18. The method, of either of the Modalities 1 and 10-12, in which the dynamic indication is given by CE MAC.

[00148] Modality 19. A method for a base station that uses control signaling for dynamic indication of channel state information (CSI) resources to a wireless device, the method comprising: establish one of: a one-to-one correspondence between a CSI report definition and a CSI Reference Symbol (RS) feature set such that the CSI-RS feature set can be determined on the wireless device from a CSI report definition indication; and a one-to-one correspondence between a subset of Petition 870250059249, dated 11 / 07 / 2025, p. 67 / 131 / 64 report and a CSI-RS feature set so that a report subset can be determined on the wireless device from an indication of the CSI-RS feature set and an indication of the CSI report definition.

[00149] Mode 20. The Mode 19 method, which additionally comprises sending to the wireless device an indication of the CSI report definition and CSI-RS capabilities.

[00150] Mode 21. The method, of either Mode 19 or 20, where a total number of bits will be sent to indicate a CSI report definition, and a CSI-RS resource, is [log2(N)j + [log2(Ks)] bits, where N is the number of CSI Report Definitions and Ks is the number of CSI-RS resources.

[00151] Mode 22. The Mode 19 method, in which an integer number of different CSI-RS feature sets are linked in a CSI report definition.

[00152] Mode 23. The method, of any of Modes 19-22, in which a feature set is unique to a particular number of antenna ports and a particular time-domain behavior of the features in the set.

[00153] Mode 24. A base station that uses control signaling for dynamic indication of channel state information (CSI) resources to a wireless device, the base station comprising: a processing circuit system configured to establish one of: a one-to-one correspondence between a CSI report definition and a CSI Reference Symbol (RS) feature set such that the CSI-RS feature set can be determined on the wireless device from a CSI report definition indication; and a one-to-one correspondence between a subset of Petition 870250059249, dated 11 / 07 / 2025, p. 68 / 131 / 64 report and a CSI-RS feature set so that a report subset can be determined on the wireless device from an indication of the CSI-RS feature set and an indication of the CSI report definition.

[00154] Mode 25. The Mode 24 base station, which additionally comprises a transmitter configured to send to the wireless device an indication of the CSI report definition and CSI-RS capabilities.

[00155] Mode 26. The base station of either Mode 24 or 25, where the total number of bits that will be sent to indicate a CSI report definition, and a CSI-RD resource is [log2(N)j + [log2(Ks)] bits, where N is the number of CSI Report Definitions and Ks is the number of CSI-RS resources.

[00156] Mode 27. The Mode 24 base station, in which an integer number of different CSI-RS resource sets are linked in a CSI report definition.

[00157] Mode 28. The base station of any of Modes 24-27, in which a feature set is unique to a particular number of antenna ports and a particular time-domain behavior of the features in the set.

[00158] Mode 29. A base station that uses control signaling for dynamic indication of channel state information (CSI) resources to a wireless device, wherein the base station comprises: a binding module configured to establish a: a one-to-one correspondence between a CSI report definition and a CSI Reference Symbol (RS) feature set such that the CSI-RS feature set can be determined on the wireless device from an indication of the CSI report definition; and Petition 870250059249, dated 11 / 07 / 2025, p. 69 / 131 / 64 a one-to-one correspondence between a report subset and a CSI-RS feature set such that a report subset can be determined on the wireless device from an indication of the CSI-RS feature set and an indication of the CSI report definition.

[00159] Modality 30. A method, for a wireless device, for determining a feature set of the channel state information reference symbol, CSI-RS, indicated by a base station, the method comprising: determine one of: A CSI-RS feature set based on an indication of a CSI report definition, the CSI report definition having a one-to-one correspondence with respect to a CSI-RS feature set; and a report subset based on a CSI report definition and a CSI-RS feature set, the CSI-RS feature set having a one-to-one correspondence with respect to a report subset.

[00160] Mode 31. The Mode 30 method, which additionally includes receiving, from the base station, an indication of the CSI report definition and CSI-RS resources.

[00161] Mode 32. The Mode 30 method, in which an integer number of different CSI-RS feature sets are linked in a CSI report definition.

[00162] Mode 33. The method, of any of Modes 30-32, in which a feature set is unique to a particular number of antenna ports and a particular time-domain behavior of the features in the set.

[00163] Mode 34. A wireless device for determining the Petition 870250059249, dated 11 / 07 / 2025, p. 70 / 131 / 64 resources of the Channel State Information Reference Symbol, CSI-RS, indicated by a base station, where the wireless device comprises: a processing circuit system configured to determine one of: A CSI-RS feature set based on an indication of a CSI report definition, the CSI-RS report definition having a one-to-one correspondence with respect to a CSI-RS feature set; and a report subset based on a CSI report definition and a CSI-RS feature set, the CSI-RS feature set having a one-to-one correspondence with respect to a report subset.

[00164] Mode 35. The Mode 34 wireless device, which additionally comprises a receiver configured to receive from the base station an indication of the CSI report definition and CSI-RS capabilities.

[00165] Mode 36. The wireless device of Mode 34, in which an integer number of different CSI-RS feature sets are linked in a CSI report definition.

[00166] Mode 37. The wireless device of any of Modes 34-36, wherein a feature set is unique to a particular number of antenna ports and a particular time-domain behavior of the features in the set.

[00167] Modality 38. A wireless device for determining the channel state information reference symbol, CSI-RS, features indicated by a base station, wherein the wireless device comprises: a determination module configured to determine one of: a set of CSI-RS features based on a Petition 870250059249, dated 11 / 07 / 2025, p. 71 / 131 / 64 indicating a definition of CSI reporting, the definition of CSI-RS reporting having a one-to-one correspondence with respect to a CSI-RS feature set; and a reporting subset based on a definition of CSI reporting and a CSI-RS feature set, the CSI-RS feature set having a one-to-one correspondence with respect to a reporting subset.

[00168] Modality 39. A method for a base station for signaling the Channel State Information Reference Symbol, CSI-RS, resources that will be used by a wireless device, wherein the method includes at least one of: Select one or more CSI-RS feature sets; Select one or more CSI-RS features in each of the selected CSI-RS feature sets; and select the maximum number of CSI-RS features in a CSI-RS feature set, the selection of the maximum number calculated to achieve similarity between the numbers of CSI-RS features in one or more CSI-RS feature sets.

[00169] Mode 40. The Mode 39 method, in which each CSI-RS resource set contains CSI-RS resources with different numbers of antenna ports.

[00170] Mode 41. The method, of either Mode 39 or 40, in which each CSI-RS feature set contains CSI-RS features with different time-domain behavior.

[00171] Modality 42. A base station for signaling the Channel State Information Reference Symbol, CRS-RS, resources to be used by a wireless device, wherein the base station comprises: a processing circuit system configured for Petition 870250059249, dated 11 / 07 / 2025, p. 72 / 131 / 64, requires at least one of the following: Select one or more CSI-RS feature sets; Select one or more CSI-RS features in each of the selected CSI-RS feature sets; and select the maximum number of CSI-RS features in a CSI-RS feature set, the selection of the maximum number calculated to achieve similarity between the numbers of CSI-RS features in one or more CSI-RS feature sets.

[00172] Mode 43. A method, for a wireless device, for receiving the Channel State Information Reference Symbol, CSI-RS, resources from a base station, wherein the CSI-RS resources are obtained according to the method of any of Modes 3941.

[00173] Modality 44. A wireless device for receiving Channel State Information Reference Symbol (CRS-RS) resources from a base station, wherein the wireless device comprises: a processing circuit system configured to process CSI-RS features obtained according to the method of any of Modalities 39-41. Abbreviation Definition

[00174] CSI Channel Status Information TRP Transmission / Reception Point UE User Equipment NW Network BPL Beam Pair Link BLF Beam Pair Link Failure BLM Beam Pair Link Monitoring BPS Beam Pair Link Switching RLM Radio Link Monitoring Petition 870250059249, dated 11 / 07 / 2025, page 73 / 131 / 64 RLF Radio Link Failure PDCCH Downlink Control Channel Physical RRC Radio Resource Control CRS Cell-Specific Reference Signal CSI-RS Channel Status Information Reference Signal RSRP Received Power of the Reference Signal RSRQ Received Quality of the Reference Signal HARQ Hybrid Automatic Repeat Request gNB New Radio Base Station Node (NR) PRB Physical Resource Block RE Resource Element

[00175] As those skilled in the art will perceive, the concepts described herein may be embodied as a method, a data processing system, and / or a computer program product. Thus, the concepts described herein may take the form of a wholly hardware embodiment, a wholly software embodiment, or an embodiment that combines software and hardware aspects, all generally referred to herein as a “circuit” or a “module.” Furthermore, the description may take the form of a computer program product on a tangible computer-readable storage medium that has computer program code embedded in the medium that can be executed by a computer. Any suitable tangible computer-readable media may be used, including hard disks, CD-ROMs, electronic storage devices, optical storage devices, or magnetic storage devices.

[00176] Some modalities are described here in relation to flowchart illustrations and / or block diagrams of computer program methods, systems and products. It will be understood that each Petition 870250059249, dated 11 / 07 / 2025, page 74 / 131 / 64 block of flowchart illustrations and / or block diagrams, and the combinations of blocks in flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided for a processor of a general-purpose computer (thus creating a special-purpose computer), a special-purpose computer, or other programmable data processing device to produce a machine, in such a way that the instructions, which execute through the computer processor or other programmable data processing device, create means to implement the functions / acts specified in the block or blocks of the flowchart and / or block diagram.

[00177] These computer program instructions may also be stored in computer-readable memory or storage media that may direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture that includes the instruction means that implement the function / act specified in the block or blocks of the flowchart and / or block diagram.

[00178] Computer program instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process in such a way that the instructions executing on the computer or other programmable device provide the steps to implement the functions / acts specified in the block or blocks of the flowchart and / or block diagram.

[00179] It should be understood that the functions / actions noted in the blocks may occur out of the order shown in the operational illustrations. By Petition 870250059249, dated 11 / 07 / 2025, page 75 / 131 / 64 example, two blocks shown in succession may, in fact, be executed in a substantially concurrent manner, or the blocks may sometimes be executed in reverse order, depending on the functionality / acts involved. Although some of the diagrams include arrows on the communication paths to show a primary communication direction, it should be understood that communication may occur in the opposite direction to the arrows shown.

[00180] The computer program code to perform the operations of the concepts described here can be written in an object-oriented programming language, such as Java® or C++. However, the computer program code to perform the operations described can also be written in conventional procedural programming languages, such as the C programming language. The program code can run entirely on the user's computer, partially on the user's computer as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer. In the last scenario, the remote computer can be connected to the user's computer via a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, via the Internet using an Internet Service Provider).

[00181] Many different embodiments have been described herein, in connection with the description set forth and the drawings. It will be understood that it would be unduly repetitive and obfuscating to literally describe and illustrate every combination and subcombination of these embodiments. In this manner, all embodiments may be combined in any way and / or in any combination, and the present specification, including the drawings, shall be interpreted as constituting a complete written description of all combinations and subcombinations of the embodiments described herein, and of the manner and process of making and using them, and shall support the claims to Petition 870250059249, dated 11 / 07 / 2025, p. 76 / 131 / 64 all such combination or subcombination.

[00182] It will be perceived by those skilled in the art that the embodiments described herein are not limited to what has been specifically shown here and described previously. Furthermore, unless mention has been made to the contrary, it should be noted that all accompanying drawings are not to scale. A variety of modifications and variations are possible in light of the precepts set forth without departing from the scope of the following claims. Petition 870250059249, dated 11 / 07 / 2025, p. 77 / 131

Claims

1 / 5 CLAIMS 1. A method for channel state information feedback, CSI, in a user-configured upper-layer device with M CSI Report Definitions containing parameters related to CSI reporting and N Feature Definitions containing the parameters that define S CSI Feature Sets for channel measurement and its properties, characterized in that the method comprises: receiving a dynamic indication of a CSI Report Definition from the M CSI Report Definitions (S126) and CSI Reference Signal Features, CSI-RS; determining a CSI-RS Feature Set based on: the dynamic indication received from the CSI Report Definition;and one among a plurality of preconfigured matches, one among the plurality of preconfigured matches being between a CSI Reporting Definition of the M CSI Reporting Definitions and a CSI-RS Resource Set of the S CSI Resource Sets that are defined by the configuration of the M CSI Reporting Definitions and the N Resource Definitions; a time-domain behavior defined in the CSI Reporting Definition being compatible with a time-domain behavior in CSI-RS resources contained in the CSI-RS Resource Set; and initiating CSI feedback based on at least the determination.

2. Method according to claim 1, characterized in that a codebook configuration and one or more related parameters defined in the CSI Reporting Definition are compatible with Petition 870250059249, dated 11 / 07 / 2025, page 78 / 131 2 / 5 a number of ports in CSI-RS resources contained in the CSI-RS Resource Set.

3. Method according to claim 1 or 2, characterized in that the dynamic indication is given by DCI.

4. Method according to claim 1 or 2, characterized in that the dynamic indication is given by MAC CE.

5. Method according to any one of claims 1 to 4, characterized in that the M CSI Report Definitions linked in a Resource Definition (N = 1) is defined equal to S CSI-RS Resource Sets in a Resource Definition.

6. A method according to any one of claims 1 to 5, characterized in that a complete Report Definition corresponds to only one CSI-RS Feature Set.

7. Method according to any one of claims 1 to 6, characterized in that the dynamic indication explicitly indicates a selection of one or more CSI Report Definition(s) and a selection of one or more CSI-RS features.

8. Method according to any one of claims 1 to 7, characterized in that a CSI Report Definition (M = 1) is linked to a Resource Definition (N = 1) that contains S CSI-RS Resource Sets.

9. Method for a base station (20) for signaling channel state information reference signal resources, CSI-RS, to be used by a wireless device (40), characterized in that the method includes: configuring the wireless device by upper layers with M CSI Report Definitions containing parameters related to CSI reporting and N Resource Definitions containing parameters that define S CSI-RS Resource Sets for use in channel measurement and their Petition 870250059249, dated 11 / 07 / 2025, page.79 / 131 3 / 5 properties; send to the wireless device a dynamic indication of a CSI Report Definition from among the M CSI Report Definitions and CSI-RS resources; the dynamic indication and one of a plurality of pre-configured matches are configured to allow the wireless device to determine a CSI-RS Resource Set, one of the plurality of pre-configured matches being between a CSI Report Definition from the M CSI Report Definitions and a CSI-RS Resource Set from the S CSI Resource Sets that are defined by the configuration of the M CSI Report Definitions and the N Resource Definitions; and a time-domain behavior defined in the CSI Report Definition being compatible with a time-domain behavior in CSI-RS resources contained in the CSI-RS Resource Set.

10. User equipment (40) configured by upper layers with M CSI Report Definitions containing parameters related to CSI reporting and N Resource Definitions containing parameters that define S CSI Resource Set for channel measurement and its properties, characterized in that the user equipment (40) comprises processing circuits (42) configured to: receive a dynamic indication of a CSI Report Definition from the M CSI Report Definitions and CSI Reference Signal Resource Definitions, CSI-RS; determine a CSI-RS Resource Set based on: the dynamic indication received from the CSI Report Definition; and one among a plurality of matches pre-Petition 870250059249, dated 11 / 07 / 2025, page.80 / 131 4 / 5 configured, one of the plurality of preconfigured matches being between a CSI Reporting Definition of the M CSI Reporting Definitions and a CSI-RS Resource Set of the S CSI Resource Sets that are defined by the configuration of the M CSI Reporting Definitions and the N Resource Definitions; a time-domain behavior defined in the CSI Reporting Definition being compatible with a time-domain behavior in CSI-RS resources contained in the CSI-RS Resource Set; and initiating CSI feedback based on at least the determination.

11. User equipment (40) according to claim 10, characterized in that a codebook configuration and one or more related parameters defined in the CSI Report Definition are compatible with a number of ports in CSIRS resources contained in the CSI-RS Resource Set.

12. User equipment (40) according to claim 10 or 11, characterized in that the dynamic indication is given by DCI.

13. User equipment (40) according to claim 10 or 11, characterized in that the dynamic indication is given by MAC CE.

14. User equipment (40) according to any one of claims 10 to 13, characterized in that the M CSI Report Definitions linked in a Resource Definition (N = 1) is defined equal to the S CSI-RS Resource Sets in a Resource Definition.

15. User equipment (40) according to any of claims 10 to 14, characterized in that the dynamic indication explicitly indicates a selection of one or more Definition(s) Petition 870250059249, dated 11 / 07 / 2025, page 81 / 131 5 / 5 of CSI Report and a selection of one or more CSI-RS features.

16. User equipment (40) according to any one of claims 10 to 15, characterized in that a CSI Report Definition (M = 1) is linked to a Feature Definition (N = 1) that contains S CSI-RS Feature Sets. Petition 870250059249, dated 11 / 07 / 2025, p. 82 / 131

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