Dynamic indication for channel state information feedback

Abstract

Methods, base stations, and wireless devices for dynamically indicating channel state information, CSI, resources are provided. According to one aspect, a method for a wireless device for determining a set of channel state information reference symbol, CSI-RS, resources indicated by a base station is provided. The method includes determining the set of CSI-RS resources based on an indication of a CSI report setting. The CSI report setting has a one-to-one correspondence with the set of CSI-RS resources.

Description

[0001] This application is a divisional application of Chinese patent application No. 201880023389.8, entitled "Dynamic Indicator for Channel State Information Feedback" (filed on February 6, 2018). Technical Field

[0002] This disclosure relates to wireless communications, and in particular to dynamic indications for channel state information (CSI) feedback. Background Technology

[0003] Fifth-generation mobile telecommunications and wireless technologies are not yet fully defined, but are in the advanced draft stage within 3GPP. This includes work on 5G New Radio (NR) access technologies. The terminology LTE is used in this disclosure in a forward-looking sense to encompass equivalent 5G entities or functions, but different terminology may be specified in 5G. A general description of the protocol for 5G New Radio (NR) access technologies is currently included in 3GPP TR 38.802 V1.0.0 (2016-11). The final specification may be published, in particular, in future 3GPP TS 38.3** and / or 38.2** series.

[0004] Next-generation mobile wireless communication systems, such as fifth-generation (5G) or new radio (NR), will support a variety of use cases and deployment scenarios. The latter includes deployments at low frequencies (hundreds of MHz) similar to today's Long Term Evolution (LTE) as well as at very high frequencies (tens of GHz millimeter waves). At high frequencies, propagation characteristics present challenges in achieving good coverage. One solution to the coverage problem is to employ high-gain beamforming, typically facilitated by analog circuitry, to achieve a satisfactory link budget. Beamforming will also be used at lower frequencies (primarily using digital circuitry for digital beamforming, typically) and is expected to be similar in nature to the already standardized 3GPP (3rd Generation Partnership Project) LTE (4G) systems.

[0005] Of particular relevance is section 6.10.5 of 3GPP standard TS 36.211 V14.1.0 (2016-12), which relates to the Channel State Information Reference Signal (CSI-RS). A similar signal is expected to be designed for NR, and this signal is the subject of this disclosure.

[0006] Note that the terminology used herein, such as New Wireless Node B (gNB) and Wireless Device (WD), should be considered non-limiting and does not imply any hierarchical relationship between them; generally, "gNB" can be used as a reference to General Device 1, and "WD" can be used as Device 2, where the two general devices can communicate with each other via a wireless channel. Alternatively, other terms such as "gNodeB," "eNodeB," and "eNB" can be used instead of "gNB" in different communication systems.

[0007] LTE and NR use Orthogonal Frequency Division Multiplexing (OFDM) in the downlink and Discrete Fourier Transform (DFT) extended OFDM or OFDM in the uplink. Therefore, basic LTE or NR downlink physical resources can be viewed as follows: Figure 1 The time-frequency grid shown is such that each resource element corresponds to one OFDM subcarrier during one OFDM symbol interval. Although in Figure 1 The diagram shows a subcarrier spacing of Δf = 15 kHz, but different subcarrier spacing values ​​are supported in NR. The subcarrier spacing values ​​supported in NR (also known as different numerical schemes) are given by Δf = (15 × 2^α) kHz, where α is a non-negative integer.

[0008] In the time domain, LTE downlink transmissions are organized into 10ms radio frames, each consisting of... Figure 2 The length shown is T 子帧 It consists of ten equal-sized subframes, each 1ms long. A similar frame structure can be used in NR, where the subframe length is fixed at 1ms and is independent of the subcarrier spacing used. The number of time slots per subframe depends on the configured subcarrier spacing. Assuming there are 14 OFDM symbols per time slot, then (15 × α) 2 The time slot duration of the kHz subcarrier spacing is determined by 1 / α. 2 MS provides this.

[0009] Furthermore, resource allocation in LTE is typically described based on resource blocks, where a resource block (RB) corresponds to a time slot (0.5ms) in the time domain and 12 consecutive subcarriers in the frequency domain. Resource blocks are numbered in the frequency domain, starting with 0 from one end of the system bandwidth. In NR, resource allocation in the time domain can be in units of time slots (i.e., time slot-based transmission) or in units shorter than a time slot (i.e., non-time slot-based transmission).

[0010] Downlink transmission is dynamically scheduled; that is, in each subframe, the gNB sends control information about which terminal's data to send and on which resource block the data will be sent. This control signaling is typically sent in the first 1, 2, 3, or 4 OFDM symbols of each subframe in LTE, and in 1 or 2 OFDM symbols in NR. A downlink system with 3 OFDM symbols for control against LTE... Figure 3 As shown in the image.

[0011] Codebook-based precoding

[0012] Multi-antenna technology can significantly improve the data rate and reliability of wireless communication systems. Performance is particularly improved when both the transmitter and receiver are equipped with multiple antennas, resulting in a multiple-input multiple-output (MIMO) communication channel. Such systems and / or related technologies are commonly referred to as MIMO.

[0013] NR is currently evolving through MIMO support. A core component of NR is the deployment of MIMO antennas and the support for MIMO-related technologies, including beamforming at higher carrier frequencies. Currently, LTE and NR support an 8-layer spatial multiplexing mode with up to 32 transmit (Tx) antennas using channel-dependent precoding. This spatial multiplexing mode is designed for high data rates under favorable channel conditions. Figure 4 The document provides a diagram illustrating space reuse operations.

[0014] like Figure 4 As can be seen, the information-carrying symbol vector s multiplied by N T ×r precoder matrix W, which is used in N T (corresponding to N) T Transmit energy is allocated in a subspace of a (antenna port) dimensional vector space. The precoder matrix is ​​typically selected from a codebook of possible precoder matrices and is usually indicated by a precoder matrix indicator (PMI), which specifies a unique precoder matrix in the codebook for a given number of symbol streams. The r symbols in s each correspond to a layer, and r is called the transmission rank. In this way, spatial multiplexing is achieved because multiple symbols can be transmitted simultaneously on the same time / frequency resource element (TFRE). The number of symbols r is typically adapted to suit the current channel properties.

[0015] LTE and NR use OFDM in the downlink, and therefore for a certain TFRE on subcarrier n (or alternatively, data TFRE number n), the received N R ×1 vector y n Modeled by the following formula

[0016] y n=H n Ws n +e n

[0017] Where e n It is the noise / interference vector obtained as the random process unfolds. The precoder W can be a wideband precoder, which is frequency-constant or frequency-selective.

[0018] The precoder matrix is ​​typically chosen to match N. R ×N T MIMO channel matrix H n The characteristics of this lead to what is known as channel-dependent precoding. This is often referred to as closed-loop precoding and essentially aims to focus transmit energy into a subspace that is strong in the sense that a large amount of transmitted energy is being transferred to the WD. Additionally, the precoder matrix can be chosen to strive for channel orthogonality, which means that after appropriate linear equalization at the WD, inter-layer interference is reduced.

[0019] The transmission rank, and therefore the number of spatial multiplexing layers, is reflected in the number of columns in the precoder. To achieve high performance, a transmission rank that matches the channel properties should be selected.

[0020] Codebook-based Channel State Information (CSI) Estimation and Feedback

[0021] In closed-loop MIMO transmission schemes of LTE, such as transmission modes 9 and 10, the WD estimates the downlink CSI and feeds it back to the eNodeB. The eNodeB uses the feedback CSI to send downlink data to the WD. The CSI includes the Transport Rank Indicator (RI), the Precoding Matrix Indicator (PMI), and the Channel Quality Indicator (CQI). The WD uses the codebook of the precoding matrix to find the estimated downlink channel H based on a specific criterion (e.g., WD throughput). n Optimal matching between the precoding matrix and the codebook. For transmission modes 9 and 10, channel H is estimated based on the non-zero power CSI reference signal (NZP CSI-RS) transmitted in the downlink. n .

[0022] CQI / RI / PMI together provide downlink channel status to WD. This is also known as implicit CSI feedback because it does not directly feed back to H. n The estimate. Depending on the configured reporting mode, CQI / RI / PMI can be broadband or subband.

[0023] RI corresponds to the recommended number of streams to be spatially multiplexed and thus transmitted in parallel on the downlink channel. PMI identifies the recommended precoding matrix codewords (in a codebook containing a precoder with the same number of rows as the CSI-RS ports) for transmission, which relates to the spatial characteristics of the channel. CQI represents the recommended transport block size (i.e., code rate), and LTE supports transmitting one or two transport blocks (i.e., individually coded information blocks) simultaneously (on different layers) to WD within a subframe. Therefore, there exists a relationship between the CQI of the spatial stream on which one or more transport blocks are transmitted and the signal-to-interference-noise ratio (SINR).

[0024] Codebooks for up to 16 antenna ports are defined in LTE (up to version 13). Both one-dimensional (1D) and two-dimensional (2D) antenna arrays are supported. For LTE version 12 and earlier, only codebook feedback for 1D port layouts with 2, 4, or 8 antenna ports is supported. Therefore, the codebook is designed assuming these ports are arranged in a one-dimensional straight line. In LTE Rel-13, codebooks for 2D port layouts are specified for 8, 12, or 16 antenna ports. Additionally, codebooks for 1D port layouts with 16 antenna ports are specified in LTE Rel-13. In LTE Rel-14, the 1D and 2D codebooks are extended to 32 ports (specifically, 20, 24, 28, and 32-port 1D and 2D codebooks are supported in LTE Rel-14).

[0025] In LTE Rel-13, two types of CSI reporting were introduced: Type A and Type B. In Type A CSI reporting, the WD measures and reports CSI based on a new codebook for a configured 2D antenna array with 8, 12, or 16 antenna ports. The Type A codebook is defined by five parameters: (N1, N2, Q1, Q2, CodebookConfig), where (N1, N2) are the number of antenna ports in the first and second dimensions, respectively. (Q1, Q2) are the DFT oversampling factors for the first and second dimensions, respectively. CodebookConfig ranges from 1 to 4 and defines four different ways of codebook formation. For CodebookConfig = 1, the feedback is the precoding matrix indicator (PMI) corresponding to a single 2D beam for the entire system bandwidth; for CodebookConfig = {2, 3, 4}, the feedback is the PMI corresponding to four 2D beams, and each subband can be associated with a different 2D beam. CSI includes: Rank Indicator (RI), PMI and one or more Channel Quality Indicators (CQI), similar to the CSI report in Preview-13.

[0026] In a Class B CSI report, in a scenario (also known as "K_") (CSI-RS) >1”), the eNB can pre-form multiple beams in one antenna dimension. Within each beam in another antenna dimension, there can be multiple ports (1, 2, 4, or 8 ports). A “beamforming” CSI-RS is transmitted along each beam. The WD first selects the optimal beam from the configured set of beams and then measures the CSI within the selected beam based on the version-13 LTE codebook 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 known as “K_ (CSI-RS) In a 1” configuration, the eNB can form up to 4 (2D) beams on each polarization and transmit “beam-shaped” CSI-RS along each beam. The WD measures the CSI on the “beam-shaped” CSI-RS and feeds back the CSI based on a new Class B codebook for 2, 4, or 8 ports.

[0027] Channel State Information Reference Symbol (CSI-RS)

[0028] In LTE and NR, a reference symbol sequence is introduced to estimate Channel State Information (CSI-RS). CSI-RS offers several advantages over using a common reference symbol (CRS) for CSI feedback, which is used in earlier versions of LTE for this purpose. First, CSI-RS is not used to demodulate data signals and therefore does not require the same density as CRS (i.e., CSI-RS has substantially less overhead). Second, CSI-RS provides a more flexible way to configure CSI feedback measurements (e.g., the CSI-RS resources to be measured can be configured in a WD-specific manner).

[0029] By measuring on CSI-RS, WD can estimate the effective channel that CSI-RS is traversing, including the wireless propagation channel and antenna gain. In more rigorous mathematics, this implies that if a known CSI-RS signal x is transmitted, WD can estimate the coupling between the transmitted and received signals (i.e., the effective channel). Therefore, if no virtualization is performed during transmission, the received signal y can be expressed as:

[0030] y = Hx + e

[0031] Furthermore, the WD can estimate the effective channel H. Up to 32 CSI-RS ports can be configured for LTE or NR WD. In other words, the WD can estimate the channel from up to 32 transmit antenna ports.

[0032] An antenna port is equivalent to a reference signal resource used by the WD (Driver Controller) to measure the channel. Therefore, a base station, such as a gNB with two antennas, can define two CSI-RS ports, where each port is a set of resource elements in a time-frequency grid within a subframe or time slot. The base station transmits each of these two reference signals from each of the two antennas, allowing the WD to measure both radio channels and report channel state information back to the base station based on these measurements. In LTE, CSI-RS resources with 1, 2, 4, 8, 12, 16, 20, 24, 28, and 32 ports are supported.

[0033] In LTE, CSI-RS utilizes a 2-bit orthogonal coverage code (OCC) to cover two antenna ports on two contiguous resource elements (REs). More specifically, Figures 5A-5C The resource element grid on the resource block (RB) pair is shown, indicating the potential locations of the version 9 / 10WD specific RS, CSI-RS (labeled with numbers corresponding to the CSI-RS antenna ports), and CRS. For example... Figures 5A-5C As shown, many different CSI-RS patterns are available. For the case of two CSI-RS antenna ports, Figure 5A The diagram shows 20 different patterns within a subframe. (Example) Figure 5B and Figure 5C As shown, the corresponding pattern counts for 4 and 8 CSI-RS antenna ports are 10 and 5, respectively. For TDD, some additional CSI-RS patterns are available. Furthermore, LTE supports additional OCCs of length 4 and 8 to support full power utilization in cases with a large number of CSI-RS ports. An OCC of length 4 is supported when the number of CSI-RS ports is equal to or greater than 12. An OCC of length 8 is supported when the number of CSI-RS ports is 24 or 32.

[0034] The CSI reference signal configuration is given in Table 1, taken from the 3GPP LTE specification TS 36.211v.12.5.0. For example, the CSI RS configuration 5 for the four antenna ports uses (k', l') = (9, 5) in slot 1 (the second slot of the subframe), and uses the following formulas, which follow the OCC used on resource elements (k, l) = (9, 5) and (9, 6) for ports 15 and 16 respectively, and on resource elements (3, 5) and (3, 6) for ports 17 and 18 respectively (assuming the physical resource block (PRB) index m = 0), where k is the subcarrier index and l is the OFDM symbol index.

[0035] Table 1

[0036]

[0037]

[0038] The following uses factor w l″ Introducing Orthogonal Cover Codes (OCC)

[0039]

[0040]

[0041]

[0042] l"=0,1

[0043]

[0044]

[0045] Two types of CSI-RS can be defined: Non-Zero Power (NZP) CSI-RS and Zero Power (ZP) CSI-RS. NZP CSI-RS is transmitted by the network node (or gNB) used for WD to estimate the downlink channel to the network node. ZP CSI-RS, on the other hand, involves the network node allocating one or more CSI-RS resources but not transmitting on those resources. This can be used to reduce interference to neighboring cells, allowing WDs in neighboring cells to perform better channel estimation.

[0046] In NR, the following three types of CSI-RS transmission are supported:

[0047] • Aperiodic CSI-RS Transmission: This is a single CSI-RS transmission that can occur in any subframe or time slot. Here, "single" means that the CSI-RS transmission occurs only once per trigger within a time slot or subframe. The CSI-RS resources (i.e., resource element positions consisting of subcarrier positions and OFDM symbol positions) for aperiodic CSI-RS are pre-configured to the WD via higher-layer signaling. Aperiodic CSI-RS transmissions are triggered by dynamic signaling.

[0048] • Periodic CSI-RS Transmissions: These CSI-RS transmissions are pre-configured by higher-layer signaling, and the pre-configuration includes parameters such as periodicity and subframe offset, similar to LTE. Periodic CSI-RS is controlled solely by higher-layer signaling and does not require dynamic signaling to trigger periodic CSI-RS transmissions. That is, periodic CSI-RS transmissions begin after a Radio Resource Control (RRC) configuration following the configured parameters.

[0049] Semi-static CSI-RS transmission: Similar to periodic CSI-RS, resources for semi-static CSI-RS transmission are pre-configured via higher-layer signaling to have parameters such as periodicity and subframe offset. However, unlike periodic CSI-RS, dynamic allocation signaling is required to initiate transmission of semi-static CSI-RS on the pre-configured resources. Furthermore, as... Figure 6 As shown, semi-static CSI-RS is transmitted for a limited duration (which can be referred to as the duration of the allocated semi-static CSI-RS). In some cases, dynamic deallocation signaling is required to stop the transmission of semi-static CSI-RS.

[0050] In addition to various types of CSI-RS transmissions, NR also supports various types of CSI reports. The following types of CSI reports will be supported in NR:

[0051] • Non-periodic CSI reporting: This type of CSI reporting involves a single (i.e., one-time) CSI report by WD, which is dynamically triggered by gNB.

[0052] • Periodic CSI Reporting: WD reports CSI periodically. Parameters such as periodicity and subframe offset are configured by higher-layer signaling.

[0053] Semi-static CSI reporting: Similar to periodic CSI reporting, semi-static CSI reporting has periodicity and subframe offset. However, dynamic triggering may be required to start semi-static CSI reporting. In some cases, dynamic triggering may be required to stop semi-static CSI reporting.

[0054] Regarding the association of different CSI-RS types with different CSI reporting types, the combinations supported in NR are shown in Table 2.

[0055] Table 2-NR lists the supported combinations of CSI-RS types and CSI report types.

[0056]

[0057]

[0058] Interference Measurement Resources (IMR)

[0059] In LTE, the Interference Measurement Resource (IMR) is introduced in transmission mode 10, which provides the benefit of better defining CSI measurements compared to other transmission modes where interference measurements are not defined (e.g., transmission mode 9). This results in the performance enhancement of transmission mode 10 over other transmission modes.

[0060] LTE already supports IMR based on ZP CSI-RS. ZP CSI-RS-based IMRs are typically used for incoherent interference measurements, where the data WD measures the interference power on the IMR. Such interference power measurements based on ZP CSI-RS are useful in most cases, except for some use cases involving MU-MIMO (i.e., transmitting data to multiple WDs in the same resource) and Coordinated Multipoint (COMP) (i.e., sending data from one or more coordinating transmitters to WDs). In some cases, coherent interference measurements are useful when the WD measures the interfering channel. A potential use case is accurate interference estimation to suppress interference from the dominant interfering source. NZP CSI-RS-based IMRs are well-suited for such coherent interference measurements. In NR, both ZP CSI-RS-based and NZP CSI-RS-based IMRs may be supported.

[0061] An effective mechanism is needed for channel state information (CSI) feedback. Summary of the Invention

[0062] Some embodiments advantageously provide methods, base stations, and wireless devices for dynamically indicating Channel State Information (CSI) resources using control signaling. According to one aspect, some embodiments include a method for initiating CSI feedback in a wireless device configured by a higher layer to have M reporting settings and N resource settings, the M reporting settings containing parameters related to CSI reporting, and the N resource settings containing parameters defining resources and their attributes for channel measurements. The method includes: a) obtaining a pre-configured relationship between the reporting settings and resource settings via a higher layer configuration; b) determining S sets of CSI-RS resources within each resource setting based on the higher layer configuration, wherein each CSI-RS resource set contains a plurality of CSI-RS resources for channel measurements; c) receiving, via a higher layer configuration, a pre-configured correspondence between one CSI-RS resource set within the S CSI-RS resource sets of a resource setting and a portion or all of the CSI reporting settings linked to the resource setting using parameter configuration compatibility; and d) receiving a dynamic indication associated with the correspondence between the CSI-RS resource sets and the CSI reporting settings.

[0063] According to another aspect, a method for a wireless device is provided for determining a Channel State Information Reference Symbol (CSI-RS) resource set indicated by a base station. The method includes determining the CSI-RS resource set based on an indication of a CSI report setting having a one-to-one correspondence with the CSI-RS resource set.

[0064] According to another aspect, a wireless device that initiates Channel State Information (CSI) feedback in a wireless device, the wireless device being configured by a higher layer to have M reporting settings containing parameters related to CSI reporting and N resource settings containing parameters defining resources and their attributes for channel measurement, the wireless device including processing circuitry configured to perform at least one of the following: a) obtaining a pre-configured relationship between the reporting settings and the resource settings via the higher layer configuration; b) determining S CSI-RS resource sets within each resource setting based on the higher layer configuration, wherein the CSI-RS resource sets contain multiple CSI-RS resources for channel measurement; c) receiving a pre-configured correspondence between the CSI-RS resource sets within the resource settings and a portion or all of the CSI reporting settings linked to the resource settings using parameter configuration compatibility via the higher layer configuration; and d) receiving a dynamic indication associated with the correspondence between the CSI-RS resource sets and the CSI reporting settings.

[0065] According to another aspect, a wireless device (40) for determining Channel State Information Reference Symbol (CSI-RS) resources indicated by a base station includes processing circuitry configured to determine a set of CSI-RS resources based on an indication of a CSI report setting having a one-to-one correspondence with the CSI-RS resource set.

[0066] According to another aspect, a wireless device is provided for determining Channel State Information Reference Symbol (CSI-RS) resources indicated by a base station. The wireless device includes a determining module for determining a set of CSI-RS resources based on an indication of a CSI report setting, the CSI-RS report setting having a one-to-one correspondence with the CSI-RS resource set.

[0067] According to another aspect, a method for a base station is provided. The method includes sending a CSI report setting and a dynamic indication of one or more CSI-RS resources to a wireless device, wherein a one-to-one correspondence is established between the CSI report setting and a set of CSI reference symbol RS resources.

[0068] According to another aspect, a base station is provided that uses control signaling to dynamically indicate Channel State Information (CSI) resources to a radio device. The base station includes processing circuitry configured to send indications of CSI report settings and CSI-RS resources to the radio device, wherein a one-to-one correspondence is established between the CSI report settings and the CSI-Reference Symbol (RS) resource set.

[0069] According to another aspect, a base station is provided for signaling channel state information reference symbols (CSI-RS) resources to be used by a wireless device. The method includes at least one of the following: selecting one or more sets of CSI-RS resources; selecting one or more CSI-RS resources in each of the selected sets of CSI-RS resources; and selecting a maximum number of CSI-RS resources in the sets of CSI-RS resources, the selection of the maximum number being calculated based on the similarity between the number of CSI-RS resources in the one or more sets of CSI-RS resources.

[0070] According to another aspect, a base station is provided for signaling channel state information reference symbol (CSI-RS) resources to be used by a wireless device. The base station includes processing circuitry configured to perform at least one of the following: selecting one or more sets of CSI-RS resources; selecting one or more CSI-RS resources in each of the selected sets of CSI-RS resources; and selecting a maximum number of CSI-RS resources in the sets of CSI-RS resources, the maximum number being calculated to achieve similarity between the number of CSI-RS resources in the one or more sets of CSI-RS resources.

[0071] According to another aspect, a method is provided for initiating Channel State Information (CSI) feedback in a wireless device configured by a higher layer to have a CSI report containing parameters related to CSI reporting. The method includes receiving a dynamic indication associated with the correspondence between the CSI report and resources used for channel measurements.

[0072] According to another aspect, a method for a wireless device is used to determine a Channel State Information Reference Symbol (CSI-RS) resource set indicated by a base station. The method includes determining the CSI-RS resource set based on indications from CSI reports, wherein the CSI reports have a one-to-one correspondence with the CSI-RS resource sets.

[0073] According to another embodiment, a wireless device configured to initiate Channel State Information (CSI) feedback is provided. The wireless device is configured by a higher layer to have a CSI report containing parameters related to CSI reporting. The wireless device includes a receiver configured to receive a dynamic indication associated with the correspondence between the CSI report and resources used for channel measurements.

[0074] According to another aspect, a wireless device is provided for determining a Channel State Information Reference Symbol (CSI-RS) resource set indicated by a base station. The wireless device includes processing circuitry configured to determine the CSI-RS resource set based on an indication from a CSI report, the CSI report having a one-to-one correspondence with the CSI-RS resource set. Attached Figure Description

[0075] A more complete understanding of embodiments of the invention and their accompanying advantages and features will be more readily apparent when considered in conjunction with the accompanying drawings, and by referring to the following detailed description, in which:

[0076] Figure 1 It is a time-frequency grid for resources;

[0077] Figure 2 It is a wireless frame;

[0078] Figure 3 This is an explanation of the three OFDM symbols;

[0079] Figure 4 This is a diagram illustrating space reuse;

[0080] Figure 5A The first resource element grid is shown;

[0081] Figure 5B The second resource element grid is shown;

[0082] Figure 5C The third resource element grid is shown;

[0083] Figure 6 A semi-static CSI-RS is shown;

[0084] Figure 7 An example of the CSI framework is shown;

[0085] Figure 8 Here is an example of resource settings;

[0086] Figure 9 This is a block diagram of a wireless communication network configured according to the principles described herein;

[0087] Figure 10 This is a block diagram of a base station configured according to the principles described herein;

[0088] Figure 11 This is a block diagram of another embodiment of a base station;

[0089] Figure 12 This is a block diagram of a wireless device configured according to the principles described herein;

[0090] Figure 13 This is a block diagram of an alternative embodiment of a wireless device;

[0091] Figure 14 This is a flowchart of an exemplary process in a base station for dynamically indicating CSI resources to wireless devices;

[0092] Figure 15This is a flowchart illustrating an exemplary process in a wireless device for determining a set of CSI-RS resources indicated by a base station; and

[0093] Figure 16 This is a flowchart of an exemplary process for signaling CSI-RS resources from a base station for reception and use by a wireless device.

[0094] Figure 17 This is a flowchart of an exemplary process for initiating CSI feedback in a wireless device;

[0095] Figure 18 This is a flowchart of an alternative exemplary procedure for initiating CSI feedback in a wireless device;

[0096] Figure 19 This is a flowchart of an exemplary process in a wireless device for determining a set of Channel State Information Reference Symbols (CSI-RS) resources indicated by a base station;

[0097] Figure 20 This is a diagrammatic illustration of an exemplary CSI-RS relationship;

[0098] Figure 21 This is a diagrammatic illustration of a second exemplary CSI-RS relationship;

[0099] Figure 22 This is a diagrammatic illustration of a third exemplary CSI-RS relationship; and

[0100] Figure 23 This is a flowchart of an alternative exemplary process for initiating CSI feedback in a wireless device. Detailed Implementation

[0101] Before describing the exemplary embodiments in detail, it should be noted that the embodiments primarily concern a combination of apparatus components and processing steps related to dynamic indications for channel state information (CSI) feedback. Therefore, components are indicated by conventional symbols in the drawings where appropriate, and only those specific details relevant to understanding the embodiments are shown so as not to obscure this disclosure in ways readily understood by those skilled in the art who have the benefits of the description herein. This disclosure also focuses on wireless transmissions in the downlink (DL), but the disclosures and concepts provided herein are equally applicable to the uplink (UL).

[0102] As used herein, relational terms such as “first” and “second”, “top” and “bottom” may be used only to distinguish one entity or element from another, without requiring or implying any physical or logical relationship or order between such entities or elements.

[0103] CSI Framework

[0104] The agreed-upon CSI framework for NR allows for a variety of use cases and dynamic reuse of CSI resources. According to the agreed-upon CSI framework, WD can be configured at a high level to have N≥1 CSI reporting settings, M≥1 resource settings, and 1 CSI measurement setting. The measurement setting includes L≥1 links, where each link links a reporting setting to a resource setting. Figure 7 An example of a CSI framework agreed upon in NR is shown, where N=2, M=4, and L=5.

[0105] Within each CSI report setting, the WD (by higher layers) configures parameters such as the CSI parameters for the report, codebook configuration parameters (similar to those discussed in the section titled "Codebook-based Channel State Information (CSI) Estimation and Feedback"), and the time-domain behavior of the CSI report (i.e., periodic, semi-static, or aperiodic).

[0106] Within each resource setting, the WD configuration (with higher layers) has S ≥ 1 CSI-RS resource set configuration. Within each CSI-RS resource set s, the WD is further configured by the higher layers to have K s ≥1 CSI-RS resource, where CSI-RS resources can have different mappings to REs, different numbers of ports, and different time-domain behaviors (i.e., periodic, semi-static, or aperiodic). An example resource setting with S = 2 CSI-RS resource sets is... Figure 8 As shown in the example. In this example, each of the two CSI-RS resource sets consists of 4 CSI-RS resources (i.e., K1 = 4 and K2 = 4). Figure 8 As seen in the examples, the CSI-RS resources within each CSI-RS resource set have a mixed number of ports and time-domain behaviors.

[0107] If applicable, use the following to dynamically indicate WD:

[0108] • Select one or more CSI reporting settings from the CSI measurement settings

[0109] • One or more CSI-RS resource sets selected from at least one resource setting

[0110] • Select one or more CSI-RS resources from at least one CSI-RS resource set.

[0111] Different methods of dynamic indication will be discussed in the section below titled "Mechanisms for Control Signaling".

[0112] Mechanisms used for control signaling

[0113] LTE control signaling can be carried in various ways, including carrying control information on the Physical Downlink Control Channel (PDCCH) or Physical Uplink Control Channel (PUCCH), embedding it in the Physical Uplink Shared Channel (PUSCH), in Media Access Control (MAC) control elements ('MAC CE'), or in Radio Resource Control (RRC) signaling. Each of these mechanisms is customized to carry a specific type of control information.

[0114] Control information carried on the PDCCH and PUCCH or embedded in the PUSCH is physical layer-related control information, such as downlink control information (DCI) and uplink control information (UCI), as described in 3GPP TS 36.211, 36.212, and 36.213. DCI is typically used to instruct the WD to perform certain physical layer functions, providing the information required to perform those functions. UCI typically provides the network with necessary information, such as Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK), Scheduling Request (SR), and Channel State Information (CSI), including CQI, PMI, RI, and / or CRI. UCI and DCI can be transmitted on a subframe-by-subframe basis and are therefore designed to support rapidly changing parameters, including those that can vary with rapidly fading radio channels. Because 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 to limit the control throughput.

[0115] As described in 3GPP TS 36.321, the control information carried in the MAC CE is contained in the MAC header on the shared uplink and downlink transport channels (UL-SCH and DL-SCH). Since the MAC header is not of fixed size, the control information in the MAC CE can be sent as needed and does not necessarily represent fixed overhead. Furthermore, MAC CEs can effectively carry larger control payloads because they are carried on the UL-SCH or DL-SCH transport channels, benefiting from link-adaptive HARQ and can be turbo-coded. MAC CEs are used to perform repetitive tasks using a fixed set of parameters, such as timing advance or buffer status reporting, but these tasks typically do not require transmission of MAC CEs on a subframe-by-subframe basis. Therefore, in LTE up to Rel-14, channel state information related to fast-fading radio channels, such as PMI, CQI, RI, and CRI, is not carried in the MAC CE.

[0116] Consider a CSI framework with measurement settings, consisting of N CSI reporting settings and S CSI-RS resource sets, where each CSI-RS resource set consists of K... sThis consists of several CSI-RS resources. In this case, a dynamic indication for selecting one of the N CSI reporting settings is required. Bits. A dynamic indication used to select one CSI-RS resource set from S CSI-RS resource sets is required. Bits. From K s Dynamic indication of selecting one CSI-RS resource from among the resources requires Bits. Therefore, the total number of bits required to select a CSI reporting setting, a CSI-RS resource set, and a CSI-RS resource is Bits. When N, S, and K s When the value is large, this can be equivalent to a large control signaling overhead for dynamic indication. The control signaling overhead for dynamic indication can be even greater when multiple CSI report settings, multiple CSI-RS resource sets, and multiple CSI-RS resources need to be selected.

[0117] Furthermore, not all CSI-RS resources are compatible with all CSI reporting settings. For example, a CSI-RS resource with four ports is incompatible with a CSI report with a codebook configuration supporting eight ports (i.e., the number of ports in the CSI-RS resources should be the same, and their codebook configurations should be compatible). Additionally, the timing behavior of the CSI report settings (i.e., periodic, semi-static, aperiodic) must be compatible with the timing behavior of the CSI-RS resources. It should be noted that only certain combinations of timing behaviors for CSI-RS resources and CSI reports are supported in the NR (see Table 2). Therefore, how to effectively configure measurement settings to minimize the control signaling overhead of dynamic indications remains an open question.

[0118] Another problem with existing approaches is the need to dynamically instruct (i.e., notify) the WD about the selection of three different entities (the CSI reporting settings, the CSI-RS resource set, and the CSI-RS resource). This can complicate the signaling design for dynamic instructions.

[0119] In the first embodiment (Embodiment A below), the control signaling required for dynamic indication is minimized by forming a one-to-one correspondence between a CSI report setting and a set of CSI-RS resources contained in the resource settings linked to that CSI report.

[0120] In the second embodiment (Embodiment B below), a subset of reports is created within each CSI report setting. By establishing a one-to-one correspondence between a subset of reports contained within a CSI report setting and a set of CSI-RS resources contained within a resource setting linked to that CSI report, the control signaling required for dynamic indication is minimized.

[0121] The advantages of the first embodiment can include simplified dynamic indication and minimized associated control signaling overhead. Due to the one-to-one correspondence between CSI report settings and CSI-RS resource sets, the selection of a CSI-RS resource set can be implicitly inferred from the dynamic indication of the CSI report settings. Therefore, only two distinct entities need to be dynamically indicated (the CSI report settings and the CSI-RS resources). In terms of minimizing control signaling overhead, the total number of bits required to select one CSI report setting, one CSI-RS resource set, and one CSI-RS resource is... Bits, where N is the number of CSI report settings, and K s It is K s The number of CSI-RS resources within a single CSI-RS resource set. Therefore, the number of dynamically indicated bits is reduced. Bit.

[0122] The advantages of the second embodiment may include minimizing associated control signaling overhead. Due to the one-to-one correspondence between report subsets and CSI-RS resource sets, the selection of report subsets can be implicitly inferred from the dynamic indications of the CSI-RS resource sets and the dynamic indications of the CSI report settings. Since multiple report subsets are contained within a single CSI report setting, the number of bits required to dynamically indicate the CSI report settings can be minimized.

[0123] Figure 9 This is a block diagram of a wireless communication network 10 constructed based on the principles set forth herein. 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 service provider backhaul network. A first base station 20A and a second base station 20B (collectively referred to herein as base station 20) communicate with and can communicate with each other. Base station 20 can also communicate with one or more wireless devices 40A and 40B (collectively referred to herein as WD 40). Base station 20 includes a one-to-one correspondence builder 30, which determines one of the one-to-one correspondences between CSI report settings and CSI-reference symbol (RS) resource sets, and between report subsets and CSI-RS resource sets. Additionally, WD 40 includes a CSI-RS resource determiner 50, which determines one of the CSI-RS resource sets based on the indication of the CSI report settings and one of the report subsets based on the CSI reports and CSI-RS resource sets.

[0124] Figure 10This is a block diagram of a base station 20 configured according to the principles set forth herein. The base station 20 has processing circuitry 22. In some embodiments, the processing circuitry may include a memory 24 and a processor 26, the memory 24 containing instructions that, when executed by the processor 26, configure the processor 26 to perform one or more of the functions described herein. In addition to conventional processors and memory, the processing circuitry 22 may also include integrated circuits for processing and / or control, such as one or more processors and / or processor cores and / or FPGAs (Field-Programmable Gate Arrays) and / or ASICs (Application-Specific Integrated Circuits).

[0125] Processing circuitry 22 may include and / or be connected to and / or 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, such as cache and / or buffer memory 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 code and / or other data executable by control circuitry, such as communication-related data, e.g., node configuration and / or address data, etc. Processing circuitry 22 may be configured to control any of the methods described herein and / or cause such methods to be executed, for example, by processor 26. Corresponding instructions may be stored in memory 24, which may be readable and / or readablely connected to processing circuitry 22. In other words, processing circuitry 22 may include a controller, which may include a microprocessor and / or a microcontroller and / or an FPGA (Field Programmable Gate Array) device and / or an ASIC (Application-Specific Integrated Circuit) device. The processing circuit 22 may include or be connected to or be able to connect to a memory that can be configured to be read and / or written by the controller and / or the processing circuit 22.

[0126] Memory 24 is configured to store CSI-RS resource information 28, which may include correspondence information regarding the mapping between CSI report settings and CSI-Reference Symbol (RS) resource sets and / or the mapping between report subsets and CSI-RS resource sets. Processor 26 is configured to implement a one-to-one mapping builder 30, which establishes one-to-one mappings between CSI report settings and CSI-Reference Symbol (RS) resource sets and / or between report subsets and CSI-RS resource sets. Receiver 32 may receive channel quality measurements from one or more wireless devices 40. In some embodiments, transmitter 34 is configured to send indications of CSI report settings and CSI-RS resources to wireless devices 40.

[0127] Figure 11This is a block diagram of an alternative embodiment of base station 20, which has a memory 24 configured to store CSI-RS information 28 and an association module 31 for establishing one-to-one correspondence between CSI report settings and CSI-Reference Symbol (RS) resource sets, and one-to-one correspondence between report subsets and CSI-RS resource sets.

[0128] When establishing a one-to-one correspondence between CSI report settings and CSI-RS resource sets, the CSI-RS resource set can be inferred at the wireless device 40 from the indication of the CSI report settings. Furthermore, when establishing a one-to-one correspondence between report subsets and CSI-RS resource sets, the report subsets can be inferred at the wireless device 40 from the indication of the CSI-RS resource set and the indication of the CSI report settings. Receiver module 33 is configured to receive channel quality measurements from wireless device 40. In some embodiments, transmitter module 35 is configured to transmit indications of CSI report settings and CSI-RS resources to wireless device 40.

[0129] Although embodiments are described herein with reference to certain functions performed by base station 20, it should be understood that such functions may be performed in other network nodes and elements. It should also be understood that the functions of base station 20 or other network nodes may be distributed across network cloud 16 so that other nodes may perform one or more of the functions described herein, or even a portion thereof.

[0130] Furthermore, depending on the technology and terminology used, the term base station (e.g., radio base station (RBS)) may sometimes be referred to herein as, for example, evolved NodeB, “eNB”, “eNodeB”, “NodeB”, “B-Node”, “gNB”, “gNodeB”, or BTS (Base Transceiver Station). Based on transmission power and thus also based on cell size, base station 20 may have different categories, such as, for example, macro eNodeB, home eNodeB, or pico base station. A cell is a geographical area where base station 20 provides radio coverage at a base station site. One base station 20 located at a base station site may serve one or more cells. Furthermore, each base station 20 may support one or more communication technologies. Base station 20 communicates with terminals within range of base station 20 via an air interface operating on radio frequency. In the context of this disclosure, downlink (DL) is expressed as the transmission path from base station 20 to WD 40. Uplink (UL) is expressed as the transmission path in the opposite direction (i.e., from WD 40 to base station 20).

[0131] A base station, which may be referred to as an eNodeB or eNB in ​​3GPP Long Term Evolution (LTE), or as a gNodeB or gNB in ​​5G and NR, can be directly connected to one or more core networks. Furthermore, although embodiments are described with reference to the base station, it should be understood that embodiments can be implemented in or across any suitable network node, wherein base station 20 is one type of such network node. Additionally, it should be understood that the functionality of base station 20 or other network nodes can be distributed across network cloud 16 so that other nodes can perform one or more of the functions described herein, or even a portion of the functions.

[0132] Figure 12 This is a block diagram of WD 40. WD 40 has processing circuitry 42. In some embodiments, the processing circuitry may include memory 44 and processor 46, the memory 44 containing instructions that, when executed by processor 46, configure processor 46 to perform one or more functions described herein. In addition to conventional processors and memory, processing circuitry 42 may also include integrated circuits for processing and / or control, such as one or more processors and / or processor cores and / or FPGAs (Field Programmable Gate Arrays) and / or ASICs (Application-Specific Integrated Circuits).

[0133] Processing circuitry 42 may include and / or be connected to and / or 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, such as cache and / or buffer memory 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 code and / or other data executable by control circuitry, such as communication-related data, e.g., node configuration and / or address data, etc. Processing circuitry 42 may be configured to control any methods described herein and / or cause such methods to be executed, for example, by processor 46. Corresponding instructions may be stored in memory 44, which may be readable and / or readablely connected to processing circuitry 42. In other words, processing circuitry 42 may include a controller, which may include a microprocessor and / or a microcontroller and / or an FPGA (Field Programmable Gate Array) device and / or an ASIC (Application-Specific Integrated Circuit) device. The processing circuit 42 may include or be connected to or be able to connect to a memory that can be configured to be read and / or written by the controller and / or the processing circuit 42.

[0134] Memory 44 is configured to store CSI-RS resource information 48, which may include CSI report settings, CSI reports, and indications of CSI-RS resource sets. Processor 46 is configured to implement CSI-RS resource determiner 50, which determines one of the CSI-RS resource sets based on the indications of CSI report settings and one of the report subsets based on CSI reports and CSI-RS resource sets. In some embodiments, CSI report settings have a one-to-one correspondence with CSI-RS resource sets, and CSI-RS resource sets have a one-to-one correspondence with report sets. In some embodiments, receiver 52 is configured to receive CSI report settings and indications of CSI-RS resources from a base station. Transmitter 54 is configured to transmit channel quality measurements to base station 20.

[0135] Figure 13 This is a block diagram of an alternative embodiment of a wireless device 40 having a memory 44, a determination module 51, a receiver module 53, and a transmitter module 55. The memory module 44 stores CSI-RS resource information 48. The determination module 51 is configured to determine one of a CSI-RS resource set based on an indication of CSI report settings and a subset of reports based on CSI reports and the CSI-RS resource set. In some embodiments, the receiver module 53 is configured to receive an indication of CSI report settings and CSI-RS resources from a base station. The transmitter module 55 is configured to transmit channel quality measurements to the base station 20.

[0136] In some embodiments, the non-limiting term "wireless device" is used. Wireless device 40 herein can be any type of wireless device capable of communicating via wireless signals with a network entity such as base station 20 or another wireless device 40 such as user equipment (UE). Wireless device 40 can also be a wireless communication device, a target device, a device-to-device (D2D) wireless device, a machine-type wireless device or a wireless device capable of machine-to-machine (M2M) communication, a sensor equipped with a wireless device, an iPad, a tablet computer, a mobile terminal, a smartphone, a laptop embedded device (LEE), a laptop computer mounting device (LME), a USB dongle, a customer premises equipment (CPE), etc.

[0137] Figure 14This is a flowchart illustrating an exemplary process for dynamically indicating Channel State Information (CSI) resources to a radio device 40 using control signaling at a base station 20. In a first case, a one-to-one correspondence is established between CSI report settings and CSI-RS resource sets, such that the CSI-RS resource sets can be determined at the radio device 40 from the indication of the CSI report settings (block S100). In some embodiments, the indications of the CSI report settings and CSI-RS resources are transmitted to the radio device 40 via a transmitter 34 (block S102).

[0138] Figure 15 This is a flowchart of an exemplary process in wireless device 40 for determining a CSI-RS resource set indicated by a base station. The process includes determining, via determiner 50, that the CSI-RS resource set is determined based on an indication of CSI report settings having a one-to-one correspondence with the CSI-RS resource set (block S104). In some embodiments, the CSI report settings and the indication of the CSI-RS resources are received via receiver 52 (block S110).

[0139] Figure 16 This is a flowchart of an exemplary process for signaling CSI-RS resources to be used by wireless device 40. The process includes selecting one or more sets of CSI-RS resources via processing circuitry 22 (block S108). The process also includes selecting one or more CSI-RS resources from each selected CSI-RS resource set via processing circuitry 22 (block S110). The process further includes selecting a maximum number of CSI-RS resources from the CSI-RS resource sets via processing circuitry 22, the maximum number being calculated to achieve similarity between the number of CSI-RS resources in the one or more CSI-RS resource sets (block S112).

[0140] Figure 17 This is a flowchart of an exemplary process for initiating CSI feedback in a wireless device 40 configured by a higher layer to have a CSI report containing parameters related to CSI reporting. The process includes receiving a dynamic indication (box S114) associated with the correspondence between the CSI report (or CSI report configuration) and resources used for channel measurements.

[0141] Figure 18 This is a flowchart of an exemplary process for initiating Channel State Information (CSI) feedback in a wireless device 40, which is configured by a higher layer to have M reporting settings containing parameters related to CSI reporting and N resource settings containing parameters defining resources and their attributes for channel measurements. The process includes receiving dynamic indications associated with the correspondence between the resource settings and the reporting settings (block S116).

[0142] Figure 19 This is a flowchart of an exemplary process in wireless device 40 for determining a Channel State Information Reference Symbol (CSI-RS) resource set indicated by base station 20. The process includes determining the CSI-RS resource set based on indications from a CSI report (or CSI report configuration), which has a one-to-one correspondence with the CSI-RS resource set (block S118). According to this aspect, in some embodiments, the CSI-RS resource set includes resources for channel measurements.

[0143] In some embodiments, the mappings referenced herein are configured by RRC. Furthermore, in some embodiments, CSI resources are automatically triggered given a configured mapping by dynamically triggering CSI reports.

[0144] Example A

[0145] In Example A, each resource setting in the WD is configured such that the CSI-RS resource set within the resource setting contains 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-static, and non-periodic CSI-RS resources). Figure 20 An example of this embodiment is shown, in which resource setting 0 includes 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 of which have 4 ports and aperiodic time-domain behavior, and CSI-RS resource set 1 contains 2 CSI-RS resources, both of which have 8 ports and semi-static time-domain behavior, etc.

[0146] Furthermore, in Example A, a resource setting containing S different CSI-RS resource sets is linked to S CSI reporting settings, where the s-th CSI reporting setting corresponds to the s-th CSI-RS resource set within the resource setting. Corresponding CSI reporting settings-CSI-RS resource set pairs have compatible parameter configurations. Figure 20In the example, CSI-RS reporting setting 2 with a 32-port codebook configuration corresponds to CSI-RS resource set 2 containing 32-port CSI-RS resources. Furthermore, CSI-RS reporting setting 2 is aperiodic, and CSI-RS resource set 2 also contains aperiodic CSI-RS resources. Therefore, CSI-RS reporting setting 2 is compatible with CSI-RS resource set 2 in terms of port count and temporal behavior. Although this example illustrates compatibility in terms of port count and temporal behavior, the concept of compatibility between the CSI-RS reporting setting and the CSI-RS resource set in Example A can be readily extended to other parameters.

[0147] The advantages of Implementation A can include simplified dynamic indication and minimized associated control signaling overhead. Due to the one-to-one correspondence between CSI report settings and CSI-RS resource sets, the selection of a CSI-RS resource set can be implicitly inferred from the dynamic indication of the CSI report settings. Therefore, only two distinct entities need to be dynamically indicated (the CSI report settings and the CSI-RS resource). In terms of minimizing control signaling overhead, the total number of bits required to select on a CSI report setting, a CSI-RS resource set, and a CSI-RS resource is... Bits, where N is the number of CSI report settings, and K s It is K s The number of CSI-RS resources within a single CSI-RS resource set. Therefore, the number of dynamically indicated bits is reduced. Bit.

[0148] In some embodiments, DCI signaling is used for dynamic indication. In other embodiments, MAC CE is used for dynamic signaling.

[0149] Optionally, in a variation of embodiment A, CSI-RS resources within the same CSI-RS resource set may have the same configuration only for a subset of parameters. Figure 21 In the example, CSI reporting setting 1 with an 8-port codebook configuration corresponds to CSI-RS resource set 1 containing 8-port CSI-RS resources. However, the temporal behaviors of the two resources within CSI-RS resource set 1 are different (i.e., one CSI-RS resource is aperiodic while the other is semi-static). Although the two CSI-RS resources within CSI-RS resource set 1 have different temporal behaviors, both are compatible with the temporal behavior of CSI reporting setting 1 (as can be seen from Table 2, both aperiodic CSI-RS and semi-static CSI-RS are compatible with aperiodic CSI reporting). In this case, the type of CSI-RS resource to use (i.e., aperiodic or semi-static) can be determined by dynamic indication.

[0150] Example B

[0151] In Example B, a resource setting containing S different CSI-RS resource sets is linked to a CSI reporting setting. The CSI reporting setting linked to the resource setting contains S different report subsets. The s-th report subset within the CSI reporting setting corresponds to the s-th CSI-RS resource set within the resource setting. Figure 22 In the example, report subset 2 with a 32-port codebook configuration corresponds to CSI-RS resource set 2 containing 32-port CSI-RS resources. Furthermore, report subset 2 is aperiodic, and CSI-RS resource set 2 also contains aperiodic CSI-RS resources. Therefore, report subset 2 is compatible with CSI-RS resource set 2 in both port count and temporal behavior. Although this example illustrates compatibility in both port count and temporal behavior, the concept of compatibility between the report subset and the CSI-RS resource set in embodiment B can be readily extended to other parameters.

[0152] An advantage of Embodiment B is that it minimizes the associated control signaling overhead. Due to the one-to-one correspondence between report subsets and CSI-RS resource sets, the selection of report subsets can be implicitly inferred from the dynamic indications of the CSI-RS resource sets and the dynamic indications of the CSI report settings. Since multiple report subsets are contained within a single CSI report setting, the number of bits required to dynamically indicate the CSI report setting can be minimized compared to the scenario where all four entities (CSI report setting, report subsets, CSI-RS resource sets, and CSI-RS resources) are all explicitly dynamically indicated.

[0153] In some embodiments, DCI signaling is used for dynamic indication. In other embodiments, MAC CE is used for dynamic signaling.

[0154] Example C

[0155] Note that multiple CSI-RS resource sets can be configured for the wireless device 40, and multiple CSI-RS resources can exist for each CSI-RS resource set. In embodiment C, one or more CSI-RS resources are selected by first selecting a CSI-RS resource set and then selecting one or more CSI-RS resources from the selected set. Since the number of bits required for resource selection needs to be designed based on the number of CSI-RS resource sets and the maximum number of CSI-RS resources in the set, the number of CSI-RS resources in each CSI-RS resource set should be as similar as possible for efficient dynamic signaling / indication. For example, if there are four CSI-RS resource sets, with the first set having 16 CSI-RS resources and the other three sets each having 4 resources (i.e., a total of 28 resources), a total of 6 bits are needed to select the CSI-RS resources: 2 bits for CSI-RS resource set selection and 4 bits for selecting CSI-RS resources within the selected set. On the other hand, if 28 CSI-RS resources are in two CSI-RS resource sets, each with 14 CSI-RS resources, only 5 bits are needed.

[0156] In another embodiment, each CSI-RS resource set may contain CSI-RS resources with different numbers of antenna ports and different time-domain behaviors; that is, they may be periodic CSI-RS resources or aperiodic CSI-RS resources. Multiple CSI reporting settings can be dynamically associated with a CSI-RS resource set and one or more CSI-RS resources within the selected CSI-RS resource set. An example is shown in Table 3, where three CSI-RS resource sets are configured for radio device 40. In the first set, the UE is configured with six CSI-RS resources with 8 ports and one CSI-RS resource with 32 ports, and the CSI-RS resources have different time-domain behaviors. This can be used to support hybrid CSI reporting, where periodic CSI is reported using CSI-RS resource #5 with 32 ports. Aperiodic CSI reporting can also be performed using the 32 ports of resource #5. For non-periodic CSI reporting across 8 ports, any one of the four 8-port CSI-RS resources can be used: resources #0 to #3 within the dynamically selected CSI-RS resource set 0, or the 8-port semi-static CSI-RS resource #4. CSI-RS resource sets #1 and #2 can be used to execute CSI reports from other TRPs within the CoMP transport scheme.

[0157] In some cases, CSI-RS resources from the entire CSI-RS resource set can be selected to report the best CSI or best Ω reference signal received power (RSRP) among all CSIs measured on all CSI-RS resources. Here, each RSRP corresponds to one CSI-RS resource within the selected CSI-RS resource set.

[0158] The number of CSI-RS resource sets and the maximum number of CSI-RS resources in each CSI-RS resource set can be configured semi-statically, so that the number of bits used in the dynamic indication for CSI-RS resource selection can be minimized for each deployment scenario.

[0159] Table 3

[0160] CSI-RS Resource Set 0 CSI-RS Resource Set 1 CSI-RS Resource Set 2

[0161] Figure 23 This is a flowchart of an alternative exemplary process for initiating CSI feedback in a wireless device configured by a higher layer to have M reporting settings containing parameters related to CSI reporting and N resource settings containing parameters defining resources and their attributes for channel measurements. The process includes performing at least one of the following steps: obtaining a pre-configured relationship between the reporting settings and resource settings via higher-layer configuration (S120); determining S sets of CSI-RS resources within each resource setting based on the higher-layer configuration, wherein each CSI-RS resource set contains multiple CSI-RS resources for channel measurements (S122); receiving a pre-configured correspondence via higher-layer configuration between a CSI-RS resource set within the S sets of CSI-RS resources in a resource setting and a portion or all of the CSI reporting settings linked to the resource settings using parameter configuration compatibility (S124); and receiving a dynamic indication associated with the correspondence between the CSI-RS resource sets and the CSI reporting settings (S126).

[0162] Therefore, some embodiments include a method for initiating Channel State Information (CSI) feedback in a wireless device configured by a higher layer to have M reporting settings containing parameters related to CSI reporting and N resource settings containing parameters defining resources and their attributes for channel measurements. The method includes: a) obtaining a pre-configured relationship between the reporting settings and resource settings via higher-layer configuration (S120); b) determining S CSI-RS resource sets within each resource setting based on the higher-layer configuration, wherein each CSI-RS resource set contains multiple CSI-RS resources for channel measurements (S122); c) receiving a pre-configured correspondence between a CSI-RS resource set within the S CSI-RS resource sets of a resource setting and a portion or all of a CSI reporting setting linked to the resource setting using parameter configuration compatibility (S124) via higher-layer configuration; and d) receiving a dynamic indication associated with the correspondence between the CSI-RS resource sets and the CSI reporting settings (S126).

[0163] According to this aspect, in some embodiments, the codebook configuration and one or more associated parameters defined in the reporting settings are compatible with multiple ports in the CSI-RS resources included within the CSI-RS resource set. In some embodiments, the temporal behavior defined in the reporting settings is compatible with the temporal behavior in the CSI-RS resources included within the CSI-RS resource set. In some embodiments, dynamic indication is given by the DCI. In some embodiments, dynamic indication is given by the MAC CE. In some embodiments, the number M of reporting settings linked to a resource setting (N=1) is set to be equal to the number S of CSI-RS resource sets within a resource setting. In some embodiments, the entire reporting setting corresponds to only one CSI-RS resource set. In some embodiments, the entities explicitly dynamically indicated include the selection of one or more CSI reporting settings and the selection of one or more CSI-RS resources. In some embodiments, the indication of the CSI-RS resource set is implicitly given by the dynamic indication of the selected CSI reporting settings. In some embodiments, a reporting setting (M=1) is linked to a resource setting (N=1) containing S CSI-RS resource sets.

[0164] According to another aspect, a method for a wireless device 40 is provided for determining a Channel State Information Reference Symbol (CSI-RS) resource set indicated by a base station 20. The method includes determining the CSI-RS resource set (S118) based on an indication of a CSI report setting having a one-to-one correspondence with the CSI-RS resource set.

[0165] According to this aspect, in some embodiments, the method further includes receiving from a base station a CSI reporting setting and an indication of CSI-RS resources within a CSI-RS resource set. In some embodiments, the resource set is unique for at least one of the following: the number of antenna ports; and the specific time-domain behavior of the resources in the CSI-RS resource set. In some embodiments, an integer number of distinct CSI-RS resource sets are linked to a single CSI reporting setting. In some embodiments, the CSI-RS resource set includes resources for channel measurements.

[0166] According to another aspect, a wireless device 40 is provided that initiates Channel State Information (CSI) feedback in a wireless device. The wireless device 40 is configured by a higher layer to have M reporting settings containing parameters related to CSI reporting and N resource settings containing parameters defining resources and their attributes for channel measurement. The wireless device 40 includes processing circuitry 42 configured to perform at least one of the following: a) obtaining a pre-configured relationship between the reporting settings and resource settings via the higher layer configuration; b) determining S CSI-RS resource sets within each resource setting based on the higher layer configuration, wherein each CSI-RS resource set contains multiple CSI-RS resources for channel measurement; c) receiving a pre-configured correspondence between the CSI-RS resource sets within a resource setting and a portion or all of the CSI reporting settings linked to the resource settings using parameter configuration compatibility via the higher layer configuration; and d) receiving a dynamic indication associated with the correspondence between the CSI-RS resource sets and the CSI reporting settings.

[0167] According to this aspect, the codebook configuration and one or more related parameters defined in the reporting settings are compatible with multiple ports in the CSI-RS resources included within the CSI-RS resource set. In some embodiments, the time-domain behavior defined in the reporting settings is compatible with the time-domain behavior in the CSI-RS resources included within the CSI-RS resource set. In some embodiments, dynamic indication is given by the DCI. In some embodiments, dynamic indication is given by the MAC CE. In some embodiments, the number M of reporting settings linked to a resource setting (N=1) is set to be equal to the number S of CSI-RS resource sets within a resource setting. In some embodiments, the entire reporting setting corresponds to only one CSI-RS resource set. In some embodiments, the entities explicitly dynamically indicated include the selection of one or more CSI reporting settings and the selection of one or more CSI-RS resources. In some embodiments, the indication of the CSI-RS resource set is implicitly given by the dynamic indication of the selected CSI reporting settings. In some embodiments, a reporting setting (M=1) is linked to a resource setting (N=1) containing S CSI-RS resource sets.

[0168] According to another aspect, a wireless device 40 for determining a Channel State Information Reference Symbol (CSI-RS) indicated by a base station 20 includes a processing circuit 42 configured to determine a CSI-RS resource set based on an indication of a CSI report setting having a one-to-one correspondence with the CSI-RS resource set.

[0169] According to this aspect, in some embodiments, the wireless device further includes a receiver 52 configured to receive indications of CSI reporting settings and CSI-RS resources from the base station 20. In some embodiments, an integer number of distinct CSI-RS resource sets are linked to a single CSI reporting setting. In some embodiments, the resource set is unique for at least one of the following: the number of antenna ports; and the specific time-domain behavior of the resources in the set. In some embodiments, the CSI-RS resource set includes resources for channel measurements.

[0170] According to another aspect, a wireless device (40) is provided for determining Channel State Information Reference Symbol (CSI-RS) resources indicated by a base station 20. The wireless device 40 includes a determining module (51) for determining a set of CSI-RS resources based on an indication of a CSI report setting having a one-to-one correspondence with the CSI-RS resource set.

[0171] According to another aspect, a method for a base station 20 is provided. The method includes sending a CSI report setting and a dynamic indication of one or more CSI-RS resources to a wireless device 40, wherein a one-to-one correspondence is established between the CSI report setting and a CSI-reference symbol RS resource set (S102A).

[0172] According to this aspect, in some embodiments, the total number of bits to be sent to indicate a CSI report setting and a CSI-RS resource is Bits, where N is the number of CSI report settings, and K s This refers to the number of CSI-RS resources. In some embodiments, an integer number of distinct CSI-RS resource sets are linked to a CSI reporting setting. In some embodiments, a resource set is unique for at least one of the following: the number of antenna ports; and the specific time-domain behavior of the resources in that set.

[0173] According to another aspect, a base station 20 is provided that uses control signaling to dynamically indicate Channel State Information (CSI) resources to a radio device 40. The base station 20 includes processing circuitry configured to send indications of CSI report settings and CSI-RS resources to the radio device 40, wherein a one-to-one correspondence is established between the CSI report settings and the CSI reference symbol RS resource set.

[0174] According to this aspect, in some embodiments, the total number of bits to be sent to indicate a CSI report setting and a CSI-RS resource is Bits, where N is the number of CSI report settings, and K s This refers to the number of CSI-RS resources. In some embodiments, an integer number of distinct CSI-RS resource sets are linked to a CSI reporting setting. In some embodiments, a resource set is unique for at least one of the following: the number of antenna ports; and the specific time-domain behavior of the resources in that set.

[0175] According to another aspect, a base station 20 is provided for signaling channel state information reference symbols (CSI-RS) resources to be used by a wireless device 40. The method includes at least one of the following: selecting one or more sets of CSI-RS resources; selecting one or more CSI-RS resources in each of the selected sets of CSI-RS resources; and selecting a maximum number of CSI-RS resources in the sets of CSI-RS resources, the selection of the maximum number being calculated to achieve similarity between the number of CSI-RS resources in the one or more sets of CSI-RS resources.

[0176] According to another aspect, a base station 20 is provided for signaling channel state information reference symbols (CSI-RS) resources to be used by a wireless device 40. The base station 20 includes processing circuitry 22 configured to perform at least one of the following: selecting one or more sets of CSI-RS resources; selecting one or more CSI-RS resources in each of the selected sets of CSI-RS resources; and selecting a maximum number of CSI-RS resources in the sets of CSI-RS resources, the maximum number being calculated to achieve similarity between the number of CSI-RS resources in the one or more sets of CSI-RS resources.

[0177] According to another aspect, a method is provided for initiating Channel State Information (CSI) feedback in a wireless device configured by a higher layer to have a CSI report containing parameters related to CSI reporting. The method includes receiving a dynamic indication associated with the correspondence between the CSI report and resources used for channel measurements.

[0178] According to another aspect, a method for a wireless device is provided for determining a Channel State Information Reference Symbol (CSI-RS) resource set indicated by a base station. The method includes determining the CSI-RS resource set based on indications from CSI reports, wherein the CSI reports have a one-to-one correspondence with the CSI-RS resource sets.

[0179] According to this aspect, in some embodiments, the CSI-RS resource set includes resources for channel measurements. In some embodiments, the codebook configuration and one or more associated parameters defined in the reporting settings are compatible with multiple ports in the CSI-RS resources included within the CSI-RS resource set. In some embodiments, the time-domain behavior defined in the reporting settings is compatible with the time-domain behavior of the CSI-RS resources included within the CSI-RS resource set. In some embodiments, dynamic indication is given by the DCI. In some embodiments, dynamic indication is given by the MAC CE. In some embodiments, the resource set is unique for at least one of the following: the number of antenna ports; and the specific time-domain behavior of the resources in the set.

[0180] According to another aspect, a user equipment 40 is provided that initiates channel state information (CSI) feedback in a user equipment. This user equipment is configured by a higher layer to have M reporting settings containing parameters related to CSI reporting and N resource settings containing parameters defining resources and their attributes for channel measurements. The user equipment 40 includes processing circuitry 42 configured to perform at least one of the following: a) obtaining a pre-configured relationship between the reporting settings and resource settings via higher-layer configuration (S120); b) determining S CSI-RS resource sets within each resource setting based on the higher-layer configuration, wherein each CSI-RS resource set contains multiple CSI-RS resources for channel measurements (S122); c) receiving a pre-configured correspondence between the CSI-RS resource sets within a resource setting and a portion or all of the CSI reporting settings linked to the resource setting using parameter configuration compatibility (S124) via higher-layer configuration; and d) receiving a dynamic indication associated with the correspondence between the CSI-RS resource sets and the CSI reporting settings (S126).

[0181] According to this aspect, in some embodiments, the codebook configuration and one or more associated parameters defined in the reporting settings are compatible with multiple ports in the CSI-RS resources included within the CSI-RS resource set. In some embodiments, the temporal behavior defined in the reporting settings is compatible with the temporal behavior in the CSI-RS resources included within the CSI-RS resource set. In some embodiments, dynamic indication is given by the DCI. In some embodiments, dynamic indication is given by the MAC CE. In some embodiments, the number M of reporting settings linked to a resource setting (N=1) is set to be equal to the number S of CSI-RS resource sets within a resource setting. In some embodiments, the entire reporting setting corresponds to only one CSI-RS resource set. In some embodiments, the entities explicitly dynamically indicated include the selection of one or more CSI reporting settings and the selection of one or more CSI-RS resources. In some embodiments, the indication of the CSI-RS resource set is implicitly given by the dynamic indication of the selected CSI reporting settings. In some embodiments, a reporting setting (M=1) is linked to a resource setting (N=1) containing S CSI-RS resource sets.

[0182] According to another aspect, a user equipment 40 is provided for determining a Channel State Information Reference Symbol (CSI-RS) indicated by a base station 20. The user equipment 40 includes processing circuitry 42 configured to determine a CSI-RS resource set based on an indication of a CSI report setting, the CSI-RS report setting having a one-to-one correspondence with the CSI-RS resource set.

[0183] According to this aspect, in some embodiments, user equipment 40 further includes a receiver configured to receive indications of CSI reporting settings and CSI-RS resources from base station 20. In some embodiments, an integer number of distinct CSI-RS resource sets are linked to a single CSI reporting setting. In some embodiments, the resource set is unique for at least one of the following: the number of antenna ports; and the specific time-domain behavior of the resources in the set. In some embodiments, the CSI-RS resource set includes resources for channel measurements.

[0184] According to another aspect, a user equipment 40 is provided for determining Channel State Information Reference Symbol (CSI-RS) resources indicated by a base station 20. The user equipment 40 includes a determination module 51 for determining a CSI-RS resource set based on an indication of a CSI report setting, the CSI-RS report setting having a one-to-one correspondence with the CSI-RS resource set.

[0185] According to another embodiment, a wireless device configured to initiate Channel State Information (CSI) feedback is provided. This wireless device is configured by a higher layer to have a CSI report containing parameters related to CSI reporting. The wireless device includes a receiver 52 configured to receive a dynamic indication associated with the correspondence between the CSI report and resources used for channel measurements.

[0186] According to another aspect, a wireless device 40 is provided for determining a Channel State Information Reference Symbol (CSI-RS) resource set indicated by a base station. The wireless device includes processing circuitry 42 configured to determine the CSI-RS resource set based on an indication from a CSI report having a one-to-one correspondence with the CSI-RS resource set.

[0187] Some embodiments include the following:

[0188] Example 1. A method for initiating CSI feedback in a wireless device, the wireless device being configured by a higher layer to have M reporting settings containing parameters related to CSI reporting and N resource settings containing parameters defining resources and their attributes for channel measurements, the method comprising at least one of the following:

[0189] a) Obtain the pre-configured connection between report settings and resource settings;

[0190] b) Determine S CSI-RS resource sets within each resource setting, wherein each CSI-RS resource set contains multiple CSI-RS resources used for channel measurements;

[0191] c) Obtain the pre-configured correspondence between the CSI-RS resource set within the resource settings and the usage parameter configuration compatibility link to part or all of the CSI reporting settings within the resource settings; and

[0192] d) Receive dynamic instructions to reduce control signaling overhead by utilizing the mapping between CSI-RS resource sets and CSI report settings.

[0193] Note: In some cases, the information in steps (a)-(c) above may be part of a higher-level configuration.

[0194] Example 2. According to the method of Example 1, wherein the number M of report settings linked to a resource setting (N=1) is set to be equal to the number S of CSI-RS resource sets within a resource setting.

[0195] Example 3. The method according to any one of Examples 1, 2A and 2B, wherein the entire reporting setup corresponds to only one CSI-RS resource set.

[0196] Example 4. The method according to any of Examples 1-3, wherein the codebook configuration and related parameters defined in the report settings are compatible with multiple ports in the CSI-RS resources included in the CSI-RS resource set.

[0197] Example 5. The method according to any of Examples 1-3, wherein the temporal behavior defined in the report settings is compatible with the temporal behavior in the CSI-RS resources included in the CSI-RS resource set.

[0198] Example 6. The method according to any of Examples 1-3, wherein the entity explicitly and dynamically indicated includes the selection of one or more CSI reporting settings and the selection of one or more CSI-RS resources.

[0199] Example 7. The method according to any one of Examples 1-3 and 6, wherein the indication of the CSI-RS resource set is implicitly given by a dynamic indication of the selection of CSI report settings.

[0200] Example 8. The method according to any one of Examples 1-3 and 6, wherein the dynamic indication is given by DCI.

[0201] Example 9. The method according to any one of Examples 1-3 and 6, wherein the dynamic indication is given by MAC CE.

[0202] Example 10. The method according to Example 1, wherein a report setting (M=1) is linked to a resource setting (N=1) containing S CSI-RS resource sets.

[0203] Example 11. The method according to any one of Examples 1 and 10, wherein the report settings include S subsets of reports.

[0204] Example 12. The method according to any one of Examples 1, 10 and 11, wherein a subset of reports as part of the reporting settings corresponds to only one CSI-RS resource set.

[0205] Example 13. The method according to any of Examples 1 and 10-12, wherein the codebook configuration and related parameters defined in the report subset are compatible with multiple ports in the CSI-RS resources included in the CSI-RS resource set.

[0206] Example 14. The method according to any of Examples 1 and 10-12, wherein the temporal behavior defined in the report subset is compatible with the temporal behavior in the CSI-RS resources included in the CSI-RS resource set.

[0207] Example 15. The method according to any of Examples 1 and 10-12, wherein the entities explicitly and dynamically indicated include: the selection of CSI report settings, the selection of one or more CSI-RS resource sets, and the selection of one or more CSI-RS resources.

[0208] Example 16. The method according to any one of Examples 1, 10-12 and 15, wherein the indication of the report subset is implicitly given by dynamic indication of selecting CSI report settings and selecting CSI-RS resource sets.

[0209] Example 17. The method according to any one of Examples 1 and 10-12, wherein the dynamic indication is given by DCI.

[0210] Example 18. The method according to any one of Examples 1 and 10-12, wherein the dynamic indication is given by MACCE.

[0211] Example 19. A method for a base station that uses control signaling to dynamically indicate channel state information (CSI) resources to a radio device, the method comprising:

[0212] Establish one of the following:

[0213] A one-to-one correspondence between CSI report settings and CSI-RS resource sets allows the CSI-RS resource set to be determined at the wireless device from the indication of the CSI report settings; and a one-to-one correspondence between report subsets and CSI-RS resource sets allows the report subsets to be determined at the wireless device from the indication of the CSI-RS resource set and the indication of the CSI report settings.

[0214] Example 20. The method according to Example 19 further includes: sending an indication of CSI report settings and CSI-RS resources to a wireless device.

[0215] Example 21. The method according to any of Examples 19 and 20, wherein the total number of bits to be sent for indicating a CSI report setting and a CSI-RS resource is Bits, where N is the number of CSI report settings, and K s This refers to the number of CSI-RS resources.

[0216] Example 22. The method according to Example 19, wherein an integer number of distinct CSI-RS resource sets are linked to a CSI reporting setting.

[0217] Example 23. The method according to any of the embodiments 19-22, wherein the resource set is unique for the number of antenna ports and the specific temporal behavior of the resources in the set.

[0218] Example 24. A base station that uses control signaling to dynamically indicate Channel State Information (CSI) resources to a radio device, the base station comprising:

[0219] Processing circuitry, configured to establish one of the following:

[0220] A one-to-one correspondence between CSI report settings and CSI-RS resource sets allows the CSI-RS resource set to be determined at the wireless device from the indication of the CSI report settings; and a one-to-one correspondence between report subsets and CSI-RS resource sets allows the report subsets to be determined at the wireless device from the indication of the CSI-RS resource set and the indication of the CSI report settings.

[0221] Example 25. The base station according to Example 24 further includes a transmitter configured to send indications of CSI report settings and CSI-RS resources to a wireless device.

[0222] Example 26. A base station according to any of Examples 24 and 25, wherein the total number of bits to be transmitted for indicating a CSI report setting and a CSI-RS resource is Bits, where N is the number of CSI report settings, and K s This refers to the number of CSI-RS resources.

[0223] Example 27. The base station according to Example 24, wherein an integer number of distinct CSI-RS resource sets are linked to a CSI report setting.

[0224] Example 28. A base station according to any of Examples 24-27, wherein the resource set is unique for the number of antenna ports and for the specific temporal behavior of the resources in the set.

[0225] Example 29. A base station that uses control signaling to dynamically indicate Channel State Information (CSI) resources to a radio device, the base station comprising:

[0226] The associated module is configured to establish one of the following:

[0227] A one-to-one correspondence between CSI report settings and CSI-RS resource sets allows the CSI-RS resource set to be determined at the wireless device from the indication of the CSI report settings; and a one-to-one correspondence between report subsets and CSI-RS resource sets allows the report subsets to be determined at the wireless device from the indication of the CSI-RS resource set and the indication of the CSI report settings.

[0228] Example 30. A method for a wireless device for determining a Channel State Information Reference Symbol (CSI-RS) resource set indicated by a base station, the method comprising:

[0229] Determine one of the following:

[0230] A CSI-RS resource set based on instructions from CSI report settings, wherein the CSI report settings have a one-to-one correspondence with the CSI-RS resource set; and

[0231] Based on CSI report settings and a subset of reports from the CSI-RS resource set, the CSI-RS resource set has a one-to-one correspondence with the report subset.

[0232] Example 31. The method according to Example 30 further includes: receiving an indication of CSI report settings and CSI-RS resources from a base station.

[0233] Example 32. The method according to Example 30, wherein an integer number of distinct CSI-RS resource sets are linked to a CSI reporting setting.

[0234] Example 33. The method according to any of Examples 30-32, wherein the resource set is unique for the number of antenna ports and for the specific temporal behavior of the resources in the set.

[0235] Example 34. A wireless device for determining Channel State Information Reference Symbol (CSI-RS) resources indicated by a base station, the wireless device comprising:

[0236] Processing circuitry, configured to determine one of the following:

[0237] A CSI-RS resource set based on the instructions of the CSI report settings, wherein the CSI-RS report settings have a one-to-one correspondence with the CSI-RS resource set; and

[0238] Based on CSI report settings and a subset of reports from the CSI-RS resource set, the CSI-RS resource set has a one-to-one correspondence with the report subset.

[0239] Example 35. The wireless device according to Example 34 further includes a receiver configured to receive indications of CSI report settings and CSI-RS resources from a base station.

[0240] Example 36. The wireless device according to Example 34, wherein an integer number of distinct CSI-RS resource sets are linked to a CSI reporting setting.

[0241] Example 37. A wireless device according to any of Examples 34-36, wherein the resource set is unique for the number of antenna ports and for the specific temporal behavior of the resources in the set.

[0242] Example 38. A wireless device for determining Channel State Information Reference Symbol (CSI-RS) resources indicated by a base station, the wireless device comprising:

[0243] The determination module is configured to determine one of the following:

[0244] A CSI-RS resource set based on the instructions of the CSI report settings, wherein the CSI-RS report settings have a one-to-one correspondence with the CSI-RS resource set; and

[0245] Based on CSI report settings and a subset of reports from the CSI-RS resource set, the CSI-RS resource set has a one-to-one correspondence with the report subset.

[0246] Example 39. A method for a base station for signaling channel state information reference symbols (CSI-RS) resources to be used by a wireless device, the method comprising at least one of the following:

[0247] Select one or more CSI-RS resource sets;

[0248] In each of the selected CSI-RS resource sets, select one or more CSI-RS resources; and

[0249] The maximum number of CSI-RS resources in a CSI-RS resource set is selected, and the selection of the maximum number is calculated to achieve similarity between the number of CSI-RS resources in one or more CSI-RS resource sets.

[0250] Example 40. The method according to Example 39, wherein each CSI-RS resource set contains CSI-RS resources with a different number of antenna ports.

[0251] Example 41. The method according to any of Examples 39 and 40, wherein each CSI-RS resource set contains CSI-RS resources with different temporal behaviors.

[0252] Example 42. A base station for signaling channel state information reference symbols (CSI-RS) resources to be used by a wireless device, the base station comprising:

[0253] Processing circuitry, configured to perform at least one of the following:

[0254] Select one or more CSI-RS resource sets;

[0255] In each of the selected CSI-RS resource sets, select one or more CSI-RS resources; and

[0256] The maximum number of CSI-RS resources in a CSI-RS resource set is selected, and the selection of the maximum number is calculated to achieve similarity between the number of CSI-RS resources in one or more CSI-RS resource sets.

[0257] Example 43. A method for a wireless device to receive Channel State Information Reference Symbol (CSI-RS) resources from a base station, wherein the CSI-RS resources are obtained according to the method described in any of Examples 39-41.

[0258] Example 44. A wireless device for receiving Channel State Information Reference Symbols (CSI-RS) resources from a base station, the wireless device comprising:

[0259] The processing circuit is configured to process CSI-RS resources obtained according to the method described in any of the embodiments 39-41.

[0260] Abbreviation Definition

[0261] CSI Channel State Information

[0262] TRP Transmit / Receive Point

[0263] UE User Equipment

[0264] NW Network

[0265] BPL Beamlink

[0266] BLF beam link failure

[0267] BLM beam link monitoring

[0268] BPS beam-to-link switching

[0269] RLM wireless link monitoring

[0270] RLF wireless link failure

[0271] PDCCH (Physical Downlink Control Channel)

[0272] RRC (Radio Resource Control)

[0273] CRS Cell-Specific Reference Signals

[0274] CSI-RS Channel State Information Reference Signal

[0275] RSRP reference signal received power

[0276] RSRQ reference signal reception quality

[0277] HARQ Hybrid Automatic Repeat Request

[0278] gNB New Radio (NR) Base Station Node

[0279] PRB (Physical Resource Block)

[0280] RE Resource Elements

[0281] As those skilled in the art will understand, the concepts described herein can be implemented as methods, data processing systems, and / or computer program products. Therefore, the concepts described herein can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining all software and hardware aspects generally referred to herein as “circuit” or “module.” Furthermore, this disclosure can take the form of a computer program product on a tangible computer-readable storage medium having computer program code embodied in the medium, which is executable by a computer. Any suitable tangible computer-readable medium can be used, including hard disks, CD-ROMs, electronic storage devices, optical storage devices, or magnetic storage devices.

[0282] Some embodiments are described herein with reference to flowchart illustrations and / or block diagrams of methods, systems, and computer program products. It will be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer (thus creating a special-purpose computer), a special-purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create components for implementing the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams.

[0283] These computer program instructions may also be stored in a computer-readable storage medium or storage medium that can instruct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of art including instruction components that implement the functions / actions specified in a flowchart and / or a block diagram or multiple block diagrams.

[0284] Computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions / actions specified in the flowchart and / or one or more block diagrams.

[0285] It should be understood that the functions / actions mentioned in the boxes may not occur in the order specified in the operating instructions. For example, two boxes shown consecutively may actually be executed substantially simultaneously, or these boxes may sometimes be executed in reverse order, depending on the functions / actions involved. Although some diagrams include arrows on the communication path to indicate the main direction of communication, it should be understood that communication may occur in the opposite direction to the arrows shown.

[0286] Computer program code used to perform the operations of the concepts described herein can be such as The code can be written in an object-oriented programming language such as C++. However, the computer program code used to perform the operations of this disclosure can also be written in a traditional procedural programming language, such as the "C" programming language. The program code can be executed as a standalone software package, entirely on the user's computer, partially on the user's computer, partially on the user's computer and partially on a remote computer, or entirely on a remote computer. In the latter 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 it can be connected to an external computer (e.g., using an Internet service provider via the Internet).

[0287] In conjunction with the foregoing description and accompanying drawings, numerous different embodiments have been disclosed herein. It should be understood that a literal description and illustration of every combination and sub-combination of these embodiments would be excessively repetitive and obscure. Therefore, all embodiments can be combined in any manner and / or combination, and this specification (including the accompanying drawings) should be construed as constituting a complete written description of all combinations and sub-combinations of the embodiments described herein, as well as the ways and processes of making and using them, and supporting the claims for any such combinations or sub-combinations.

[0288] Those skilled in the art will understand that the embodiments described herein are not limited to those specifically shown and described above. Furthermore, unless otherwise stated above, it should be noted that all drawings are not to scale. Various modifications and variations can be made in accordance with the foregoing teachings without departing from the scope of the appended claims.

Claims

1. A method for initiating Channel State Information (CSI) feedback in a wireless device, wherein the wireless device is configured by a higher layer with M CSI reporting settings and N resource settings, wherein, The M CSI reporting settings include parameters related to CSI reporting, and the N resource settings include parameters defining S Channel State Information Reference Signal (CSI-RS) resource sets for channel measurement and their attributes. The CSI-RS resource sets contain CSI-RS resources. The method includes: Receive a first dynamic indication of the CSI report settings in the M CSI report settings and a second dynamic indication of the CSI-RS resources; Based on the first dynamic indication and the predefined correspondence between one of the M CSI report settings and the CSI-RS resource sets in the S CSI-RS resource sets, the CSI-RS resource sets are determined; and Based on the first dynamic indication, the second dynamic indication, and the determined CSI-RS resource set, the CSI feedback is initiated.

2. The method according to claim 1, wherein, The codebook configuration and one or more related parameters defined in the CSI report settings are compatible with multiple ports in the CSI-RS resources included in the CSI-RS resource set.

3. The method according to claim 1, wherein, The time-domain behavior defined in the CSI report settings is compatible with the time-domain behavior in the CSI-RS resources included in the CSI-RS resource set.

4. The method according to claim 1, wherein, The dynamic indication is provided by DCI.

5. The method according to claim 1, wherein, The dynamic indication is provided by MAC CE.

6. The method according to any one of claims 1 to 5, wherein, The M CSI reporting settings linked to a resource setting are set to be equal to the S CSI-RS resource sets within the resource setting, where N = 1.

7. The method according to any one of claims 1 to 5, wherein, The entire CSI reporting setup corresponds to only one CSI-RS resource set.

8. The method according to any one of claims 1 to 5, wherein, A CSI reporting setup is linked to a resource setup that contains S CSI-RS resource sets, where M=1 and N=1.

9. A wireless device (40) that initiates Channel State Information (CSI) feedback in a wireless device, wherein the wireless device is configured by a higher layer with M CSI reporting settings and N resource settings, wherein, The M CSI reporting settings include parameters related to CSI reporting, the N resource settings include parameters defining S Channel State Information Reference Signal (CSI-RS) resource sets for channel measurement and their attributes, the CSI-RS resource sets contain CSI-RS resources, and the wireless device (40) includes a processing circuit (42) configured to: Receive a first dynamic indication of the CSI report settings in the M CSI report settings and a second dynamic indication of the CSI-RS resources; Based on the first dynamic indication and the predefined correspondence between one of the M CSI report settings and the CSI-RS resource sets in the S CSI-RS resource sets, the CSI-RS resource sets are determined. as well as Based on the first dynamic indication, the second dynamic indication, and the determined CSI-RS resource set, the CSI feedback is initiated.

10. The wireless device (40) according to claim 9, wherein, The codebook configuration and one or more related parameters defined in the CSI report settings are compatible with multiple ports in the CSI-RS resources included in the CSI-RS resource set.

11. The wireless device (40) according to claim 9, wherein, The time-domain behavior defined in the CSI report settings is compatible with the time-domain behavior in the CSI-RS resources included in the CSI-RS resource set.

12. The wireless device (40) according to claim 9, wherein, The dynamic indication is provided by DCI.

13. The wireless device (40) according to claim 9, wherein, The dynamic indication is provided by MAC CE.

14. The wireless device (40) according to any one of claims 9 to 13, wherein, The M CSI reporting settings linked to a resource setting are set to be equal to the S CSI-RS resource sets within the resource setting, where N = 1.

15. The wireless device (40) according to any one of claims 9 to 13, wherein, The entire CSI reporting setup corresponds to only one CSI-RS resource set.

16. The wireless device (40) according to any one of claims 9 to 13, wherein, A CSI reporting setup is linked to a resource setup that contains S CSI-RS resource sets, where M=1 and N=1.

17. A method for a base station (20) to dynamically indicate Channel State Information Reference Signal (CSI-RS) resources to a wireless device (40) using control signaling, wherein the wireless device is configured by a higher layer with M Channel State Information (CSI) reporting settings and N resource settings, wherein, The M CSI reporting settings include parameters related to CSI reporting, and the N resource settings include parameters defining S CSI-RS resource sets for channel measurement and their attributes. The CSI-RS resource sets contain CSI-RS resources. The method includes: Send a first dynamic indication of the CSI report settings in the M CSI report settings and a second dynamic indication of the CSI-RS resources to the wireless device (40), so that the wireless device can determine the CSI-RS resource set and initiate CSI feedback based on the first dynamic indication and the predefined correspondence between the CSI report settings in the M CSI report settings and the CSI-RS resource sets in the S CSI-RS resource sets.

18. The method according to claim 17, wherein, The total number of bits to be sent to indicate a CSI report setting and a CSI-RS resource is Bits, where N is the number of CSI report settings, K s This refers to the number of CSI-RS resources.

19. The method according to claim 17 or 18, wherein, An integer number of distinct CSI-RS resource sets are linked to a single CSI reporting setting.

20. The method according to claim 17 or 18, wherein, The CSI-RS resource set is unique for at least one of the following: the number of antenna ports; and the specific time-domain behavior of the CSI-RS resources in the CSI-RS resource set.

21. A base station (20) uses control signaling to dynamically indicate Channel State Information Reference Signal (CSI-RS) resources to a wireless device (40), the wireless device being configured by a higher layer with M Channel State Information (CSI) reporting settings and N resource settings, wherein, The M CSI reporting settings include parameters related to CSI reporting, and the N resource settings include parameters defining S CSI-RS resource sets for channel measurement and their attributes. The CSI-RS resource sets contain CSI-RS resources. The base station (20) includes processing circuitry configured to send a first dynamic indication of the CSI reporting settings in the M CSI reporting settings and a second dynamic indication of the CSI-RS resources to the wireless device (40), so that the wireless device can determine the CSI-RS resource sets and initiate CSI feedback based on the first dynamic indication and a predefined correspondence between the CSI reporting settings in the M CSI reporting settings and the CSI-RS resource sets in the S CSI-RS resource sets.

22. The base station (20) according to claim 21, wherein, The total number of bits to be sent to indicate a CSI report setting and a CSI-RS resource is Bits, where N is the number of CSI report settings, K s This refers to the number of CSI-RS resources.

23. The base station (20) according to claim 21 or 22, wherein, An integer number of distinct CSI-RS resource sets are linked to a single CSI reporting setting.

24. The base station (20) according to claim 21 or 22, wherein, The CSI-RS resource set is unique for at least one of the following: the number of antenna ports; and the specific time-domain behavior of the CSI-RS resources in the CSI-RS resource set.

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