Method and apparatus for extended CSI reporting for multiple downlink resources

Abstract

This invention provides methods and apparatus for enhancing CSI reporting. [Solution] Embodiments of the present disclosure relate to methods and apparatus for enhancing the reporting of channel status information (CSI) for multiple downlink resources. A method performed by a UE includes receiving a CSI report configuration from a network node that provides N reference signal resources for channel measurements, performing measurements on N RS resources, calculating or determining one or more CSI quantities for M selected RS resources, and sending a CSI report to the network node containing the calculated or determined CSI quantities, the CSI report comprising two parts, namely part 1 and part 2, where the contents contained in part 1 indicate the size of part 2. A UE, a method performed at a network node, and a network node are also disclosed.

Description

[Technical Field]

[0001] This disclosure relates to the field of wireless communication, and more specifically to a method and apparatus for enhancing the reporting of channel state information (CSI) for multiple downlink resources in wireless communication networks such as advanced 5G networks. [Background technology]

[0002] The fifth-generation (5G) mobile communication system, also known as new radio (NR), offers a higher level of performance than previous generations of mobile communication systems. 5G mobile communications have been driven by the need to provide ubiquitous connectivity for diverse applications such as automotive communications, remote control with feedback, video downloads, and data applications for Internet of Things (IoT) devices and machine-type communication (MTC) devices. 5G radio technology brings several key advantages, including higher speeds, lower latency, and improved connectivity. The Third Generation Partnership Project (3GPP) will provide complete system specifications for the 5G network architecture, including at least the radio access network (RAN), core transport network (CN), and service capabilities.

[0003] Figure 1 shows a simplified schematic diagram of an example of a wireless communication network 100, including a core network (CN) 110 and a radio access network (RAN) 120. It is shown that the RAN 120 includes multiple network nodes or radio base stations, called gNBs in 5G. Three radio base stations, gNB1, gNB2, and gNB3, are shown. Each gNB is responsible for an area called a coverage area or cell. Figure 1 shows three cells 121, 122, and 123, each serviced by its own gNB, gNB1, gNB2, and gNB3. Note that network 100 can include any number of cells and gNBs. Radio base stations or network nodes provide services to users within a cell. In 4G or LTE, radio base stations are called eNBs; in 3G or UMTS, they are called eNodeBs; and in other radio access technologies, they are called BSs. Users or user equipment (UEs) may be wireless or mobile terminal devices or fixed communication devices. A mobile terminal device or UE may be an IoT device, MTC device, etc. IoT devices may include wireless sensors, software, actuators, and computer devices. They can be embedded in mobile devices, automobiles, industrial equipment, environmental sensors, medical devices, aircraft, etc., and may also have network connectivity that allows these devices to collect and exchange data across existing network infrastructure.

[0004] Returning to Figure 1, it is shown that each cell contains UEs and IoT devices. gNB1 in cell 121 serves UE1 121A, UE2 121B, and IoT device 121C. Similarly, gNB2 in cell 121 serves UE3 122A, UE4 122B, and IoT device 122C, and gNB3 in cell 123 serves UE5 123A, UE6 123B, and IoT device 123C. Network 100 may contain any number of UEs and IoT devices or any other type of device. Devices communicate with (one or more) serving gNBs on the uplink, and (one or more) gNBs communicate with devices on the downlink. Each base station gNB1 to gNB3 may be connected to CN120 via their respective backhaul links 111, 121D, 122D, and 123D, which are schematically depicted in Figure 1 by arrows pointing to the “core”, for example, via the S1 interface. The core network 120 may be connected to one or more external networks, such as the Internet. The gNBs can be connected to each other via the S1 interface, X2 interface, or XN interface in 5G, via the respective interface links 121E, 122E, and 123E, which are shown in the diagram by arrows pointing to the gNBs.

[0005] A physical resource grid may be used for data transmission. The physical resource grid may comprise a set of resource elements (REs) to which various physical channels and physical signals are mapped. For example, physical channels may include physical downlink, uplink, and / or sidelink (SL) shared channels (PDSCH, PUSCH, PSSCH) that carry user-specific data, also known as downlink, uplink, or sidelink payload data; physical broadcast channels (PBCH) that carry, for example, master information blocks (MIBs) and system information blocks (SIBs); and physical downlink, uplink, and / or sidelink control channels (PDCCH, PUCCH, PSCCH) that carry, for example, downlink control information (DCI), uplink control information (UCI), or sidelink control information (SCI). In the case of an uplink, the physical channel may further include a physical random access channel (PRACH or RACH) used by the UE to access the network once the UE is synchronized and has obtained the MIB and SIB. The physical signal may include a reference signal (RS), a synchronization signal (SS), etc. The resource grid may consist of frames or radio frames having a duration in the time domain, such as 10 milliseconds, and a given bandwidth in the frequency domain. A radio frame may have a number of subframes of a predefined length, for example, two subframes each 1 millisecond long. Each subframe may contain two slots of several OFDM symbols depending on the length of the cyclic prefix (CP).In 5G, each slot typically consists of 14 OFDM symbols or 12 OFDM symbols, based on the standard CP and extended CP, respectively. Frames may consist of fewer OFDM symbols, for example, when utilizing a shortened transmission time interval (TTI) or a mini-slot / non-slot-based frame structure containing only a few OFDM symbols. Slot aggregation is supported in 5G NR, and therefore data transmissions can be scheduled to span one or more slots. The slot format indication tells the UE whether the OFDM symbols are downlink, uplink, or flexible.

[0006] The wireless communication network system may be any single-tone or multi-carrier system using frequency division multiplexing, such as an orthogonal frequency division multiplexing (OFDM) system, an orthogonal frequency division multiplexing (OFDMA) system, or any other IFFT-based signal with or without CP, such as DFT-OFDM. Other waveforms may be used, such as non-orthogonal waveforms for multiplexing, such as filter-bank multicarrier (FBMC), generalized frequency division multiplexing (GFDM), or universal filtered multicarrier (UFMC). The wireless communication system may operate according to, for example, the LTE-Advanced Pro standard or the 5G or NR (New Radio) standard.

[0007] The wireless communication network system shown in Figure 1 can consist of two separate overlaid networks: a macrocell network in which each macrocell contains macro base stations such as base stations gNB1-gNB3, and a network of small cell base stations (not shown in Figure 1) such as femto or pico base stations. In addition to the wireless networks described above, there are also non-terrestrial wireless communication networks that include space transceivers such as satellites and / or aerial transceivers such as unmanned aerial vehicle systems. Non-terrestrial wireless communication networks or systems can operate in the same manner as the terrestrial systems described above, with reference to Figure 1, for example, according to the LTE-advanced pro standard or 5G or NR standard.

[0008] In 3GPP NR, i.e., 5G, and its subsequent releases [1-6], downlink (DL) channel state information (CSI) reporting by the UE to network nodes (e.g., gNodeB, gNB) assists in scheduling the physical downlink shared channel (PDSCH). Downlink reference signals (RS), such as the channel state information reference signal (CSI-RS) and the synchronization signal / physical broadcast channel (SS / PBCH) block (SSB), are sometimes referred to as CSI resources and are used to evaluate the link between the UE and the network node, and the UE provides CSI feedback to the network node on the physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH), and the CSI is obtained from measurements of the reference signal.

[0009] At millimeter-wave (mmWave) frequencies (frequency range 2 (FR2)), i.e., frequencies above 6 GHz, wireless communication between communication devices is generally performed using spatially selective / directional transmit and receive, known as beams. Hereinafter, the term “beam” is used to refer to spatially selective / directional transmit of an outgoing signal or spatially selective / directional receive of an incoming signal, achieved by precoding / filtering the signal at the device’s antenna port with a set of coefficients. The terms precoding or filtering may refer to the processing of a signal in the analog or digital domain. The set of coefficients used to spatially orient transmit / receive in a particular direction may differ for one direction and another. The term “Tx beam” refers to spatially selective / directional transmit, and the term “Rx beam” refers to spatially selective / directional receive. The set of coefficients used to precode / filter transmit or receive is indicated by the term “spatial filter.” Since the spatial filter coefficients determine the direction in which transmit / receive is spatially oriented, the term “spatial filter” is used herein interchangeably with the term “beam direction.”

[0010] The term "higher layer," when used alone, refers to any communication layer above the physical layer in the protocol stack. In this disclosure, the term “frequency band” may be used to refer to any set of frequency domain resources, which does not necessarily have to refer to a frequency band around a specific carrier frequency as defined in the specification.

[0011] The terms serving cell and carrier component (CC) may be used interchangeably in this disclosure as serving cells configured for a UE, and are typically separate physical carriers having a certain carrier frequency. Depending on the frequency of the component carrier / serving cell, the size of the cell and the beamformed reference signal may vary. Each serving cell or component carrier is a set of frequency-domain resources N BWP It has a bandwidth part (BWP) of ≥ 1. In a serving cell, at any given time, the UE can receive physical layer transmissions from a TRP or any other network element in at least one of the configured BWPs of the cell's DL, and can perform transmissions in at least one of the configured BWPs of the cell's UL.

[0012] The following provides the latest state-of-the-art (SoTA) technologies regarding CSI reporting and CSI resource configuration. Issues to consider and necessary extensions for multi-TRP / panel or multi-band communications will be provided later.

[0013] Please note that any mention of an action performed by gNodeB (gNB) can also be performed by any other element of the network, and therefore any related description should be read as such.

[0014] It should also be noted that the embodiments and descriptions herein relating to multiple transmit-receive-points (TRPs) also apply to scenarios involving multiple panels from one or more base stations (gNB / TRPs) instead of multiple TRPs.

[0015] The following describes prior art related to physical downlink control and shared channels, CSI reporting, and transmission configuration indication in downlink (DL).

[0016] Physical layer downlink sharing and control channel The physical downlink control channel (PDCCH) and physical downlink sharing channel (PDSCH) carry DL control information and DL data to the UE, respectively [1-6]. The PDCCH is configured at the radio resource control (RRC) layer level by the base station or network node or gNodeB (gNB). The gNB transmits one or more PDCCHs over one or more control resource sets (CORESET) configured at the RRC level, as shown in Figure 2. A CORESET is a set of resources that can transmit control information to the UE. A CORESET has N in the frequency domain (given by the higher-layer parameter frequencyDomainResources). RB CORESET N resource blocks (RBs) and N in the time domain (given by the upper layer parameter duration) symb CORESET It consists of ∈{1,2,3} symbols. A UE can consist of up to 3 CORESETs per BWP per serving cell [1]. For the following purposes, • Scheduling of PDSCH or PUSCH or NR / LTE sidelink channels, • Slot formatting instructions, or · Sending power control commands, or • Cancel UL submission, or • Power saving information notification, or • Notification of availability of soft resources A PDCCH carrying downlink control information (DCI) for one of these may be transmitted over the CORESET.

[0017] Depending on the purpose of the DCI, the DCI can have various formats. For example, information for scheduling the PDSCH is provided to the UE via DCI having format 1_0 or 1_1. Each DCI format has a specific number of fields therein, and each field has a specific size. The sizes of some of the fields can be determined via the configuration of higher layer parameters. When a valid DCI having a specific format is detected, the UE executes the instruction that the DCI intends. For example, when detecting DCI format 1_0 or 1_1 regarding scheduling of the PDSCH, the UE receives and processes the PDSCH according to the settings provided by the DCI.

[0018] Note that the terms PDCCH and DCI can be used interchangeably in this disclosure. Both terms refer to downlink control channel information obtained via the physical layer. Channel State Information Framework Channel State Information (CSI) is provided by the UE to a network node (or gNB) after measurement of specific CSI resources in the downlink, which can be used to adapt transmission parameters on the link according to the channel state. In the DL, the CSI resources are CSI-RS and SSB resources. These DL RS resources are configured by the network node, and the CSI is calculated by the UE from these DL RS resources. The UE performs measurements on the DL RS resources according to instructions provided by the network node or according to instructions defined in the specification, and the UE provides the CSI quantities that the network node has instructed to be reported in the CSI report. The CSI report may include one or more of the following CSI quantities.

[0019] · CSI-RS Resource Indicator (CRI) · SSB Resource Indicator (SSBRI) · Layer 1 (L1), i.e., Physical Layer - Reference Signal Receiving Power (RSRP) · Layer 1 (L1), i.e., Physical Layer - Signal-to-Interference-plus-Noise Ratio (SINR) · Precoder Matrix Indicator (PMI) · Rank Indicator (RI) · Channel Quality Indicator (CQI) · Layer Indicator (LI) The UE is provided with CSI Report Configuration / Setting (CSI-ReportConfig) with N rep ≧1 and CSI Resource Setting (CSI-ResourceConfig) with N res ≧1 via upper layer signaling. Each CSI resource setting, CSI-ResourceConfig, provides one or more of the following.

[0020] · (One or more) non-zero power CSI-RS (NZP CSI-RS) resource sets including one or more non-zero power CSI-RS (NZP CSI-RS) resources · (One or more) SSB resource sets including one or more SSB resources · (One or more) CSI interference management (CSI-IM) resource sets including one or more CSI interference management (CSI-IM) resources The NZP resource or SSB resource or CSI-IM resource may have one or more ports. The CSI-IM resource may also be called a zero power (ZP) CSI-RS resource. The configuration of the CSI-IM resource has a pattern of resource elements in the time-frequency grid. These resource elements are transmitted with zero power, and intra-cell and inter-cell interference and / or noise can be measured by the UE from these resource elements.

[0021] For CSI evaluation, the gNB (or network node) provides instructions to the UE, or the instructions are specified in the specification for measuring various parameters from the provided resources. CSI measurement includes measuring the channel portion and the interference portion (the portion of the link that interferes with the UE's communications) to evaluate various CSI quantities. Channel and interference may be measured from one or more different sets or groups of resources. Interference may be measured from one or more CSI-IM resources, or NZP-CSI-RS resources, or SSB resources. However, the channel portion may be measured only from NZP CSI-RS resources or SSB resources.

[0022] The following are the information elements that provide a CSI report configuration. Each CSI report configuration is linked to at least one and up to three CSI resource settings, and the three CSI resource settings provide the following:

[0023] • One or more NZP-CSI-RS or SSB resources for channel measurement • One or more CSI-IM resources for interferometry • One or more NZP-CSI-RS or SSB resources for interferometry

[0024]

number

[0025] Report structure The UE calculates various CSI parameters or CSI quantities indicated by the gNB for the CSI report, such as those provided in the higher-layer parameter “reportQuantity” or “reportQuantity-r16” in the report configuration. The parameters are interdependent, and the calculation of one parameter may depend on another parameter.[4]

[0026] L1 shall be calculated based on the reported CQI, PMI, RI, and CRI. • CQI shall be calculated based on the reported PMI, RI, and CRI.

[0027] • PMI shall be calculated based on the reported RI and CRI. • The RI shall be calculated based on the reported CRI. The CRI or SSBRI is the resource on which the channel is measured, and the precoder (PMI), rank (RI), and corresponding CQI (indication of the "appropriate MCS" (modulation and coding scheme) according to the specification) provide link parameters for this resource.

[0028] As observed in the structure of the CSI report, at least the following aspects of the CSI report can be constructed by gNB: · CSI amount reported by UE • Frequency granularity in which one or more CSI quantities are reported • Time-domain behavior of reports (aperiodic, semi-permanent, and periodic) • Time-domain limitations for channel acquisition and interferometry for reporting purposes. Depending on the time-domain behavior of the report, the trigger and the channel through which the report is transmitted may vary. The following table from TS 38.214[4] (Table 1) provides an overview of the various time-domain behaviors supported by the 3GPP 5G NR specification for CSI reporting and associated CSI resources, the types of triggering or activation for reporting, and the uplink channels used for reporting. The media access control (MAC) layer or physical layer may be used for triggering or activating, and, where applicable, for deactivating, CSI reporting. The gNB sends a media access control-control element (MAC-CE) message for activation or deactivation of CSI reporting in the case of semi-persistent CSI reporting. The physical layer is used for triggering and deactivating, where applicable, in the case of semi-persistent or aperiodic CSI reporting.

[0029] [Table 1]

[0030] Downlink transmission configuration instruction As mentioned above, the PDCCH and PDSCH transport DL control information and DL data to the UE, respectively [1-6].

[0031] A demodulation reference signal (DMRS) is embedded in the UE for coherent demodulation of PDCCH / PDSCH. The DMRS consists of a set of DMRS ports. The number of DMRS ports determines the number of transmit layers included in the PDSCH. The DMRS is used for channel estimation in the UE to coherently demodulate a PDSCH or (one or more) PDCCH. In the case of PDCCHs, one or more of them may be transmitted over the CORESET. Therefore, the DMRS for coherent demodulation of (one or more) PDCCHs on the CORESET may be embedded across (one or more) PDCCHs transmitted over the CORESET.

[0032] The parameters in the transmission of PDCCH and PDSCH are known as the "Transmission Configuration Indication" (TCI state)[4]. In 3GPP Rel.16, the indication of how the control channel or shared channel is transmitted by the gNB and what assumptions the UE must consider while receiving them is given via the reference signal (RS). The indication to the UE is performed using TCI state information elements (IE) configured via the RRC, as shown in Figure 3. The TCI state IE includes, among other things, the following elements:

[0033] • One or more reference signals • For each reference signal, assume one or more quasi-colocations (QCLs). The TCI state is used to refer to how a PDSCH or (one or more) PDCCH transmitted on a CORESET is received. Applying the TCI state to a PDSCH or CORESET means that the PDSCH or (one or more) PDCCH transmitted on a CORESET is assumed to be in the same position as the reference signal referred to in the TCI state.

[0034] Assuming "pseudo-collocation" means that certain channel parameters, such as Doppler shift / spread, delayed spread, mean delay, and / or Tx beam direction, are assumed to be the same for the RS and PDSCH, or (one or more) PDCCH transmitted over the CORESET, as mentioned in the TCI state. 3GPP Rel.16[4] can describe four different QCL types. • "QCL-TypeA": {Doppler shift, Doppler diffusion, mean delay, delay diffusion} • "QCL-TypeB": {Doppler shift, Doppler diffusion} • "QCL-TypeC": {Doppler shift, mean delay} • "QCL-TypeD": {Spatial Rx parameter} One or more of the QCL-Info parameters are included in the TCI state IE to provide one or more QCL assumptions associated with the TCI state.

[0035] For example, consider a TCI state IE that includes a DL reference signal (RS) "A" with QCL assumption "QCL-typeA" and a DL RS "B" with QCL assumption "QCL-TypeD". Applying this TCI state to a PDSCH or CORESET with a given pseudo-collocation assumption means that the UE assumes the same Doppler shift, Doppler spread, mean delay, and delay spread for the PDSCH or (one or more) PDCCH transmitted over the CORESET and DL RS "A", and that the UE uses the same spatial filter to receive DL RS "B" and the PDSCH or (one or more) PDCCH transmitted over the CORESET, or that the Rx spatial filter for receiving (one or more) PDCCH over the CORESET or PDSCH is derived from or similar to the one used for receiving DL RS "B".

[0036] Typically, the TCI state used for a PDCCH or PDSCH includes the identifier (ID) of the Channel State Information Reference Signal (CSI-RS) or Synchronization Signal Block (SSB), along with the QCL assumption for the reference signal. The RS of the TCI state is usually the RS previously measured by the UE, and as a result, it can be used as a reference for receiving the DMRS of the PDCCH or PDSCH, and therefore can be demodulated. The TCI state instruction for a CORESET or PDSCH is performed via a MAC-CE message or using the TCI-indication field of the Downlink Control Information (DCI) used to schedule the PDSCH.

[0037] In FR2, where the gNB and UE establish a connection via a spatially selective / directional beam, the TCI state is used to indicate the spatial filters that the UE may use to receive the Rx beams that the UE may receive, i.e., the PDSCH / (one or more) PDCCH via the "qcl-TypeD" assumption with the CSI-RS or SSB received by the UE. The determination of the DL Tx beam for transmitting (one or more) PDCCH / PDSCH is performed via a beam sweep procedure by the network node (e.g., the gNB). In the beam sweep procedure, the gNB configures a set of DL RSs (CSI-RS or SSB) via the RRC for the UE to measure a set of DL RSs. Each configured DL RS is transmitted with a different spatial filter, i.e., each configured DL RS may be transmitted by the gNB in ​​a different direction. The UE measures each of the configured DL RSs by receiving them with one or more spatial filters, i.e., the RSs may all be received with the same spatial filter, or different spatial filters may be used to receive each RS. Following the measurements, the UE sends a beam report to the gNB. The beam report includes an index of the configured DL RSs 1 ≤ L ≤ 4 (essentially L DL Tx beam directions, each resulting from the use of a specific spatial filter in the gNB), along with the received power in each RS [4]. With the help of the beam report, the gNB determines one or more suitable DL Tx beam directions, i.e., spatial filters for the transmission of (one or more) PDCCHs and PDSCHs.

[0038] Multi-TRP scenario 3GPP Rel.16 standardized multi-TRP transmission to improve the reliability and robustness of PDSCH transmission. Network nodes (or gNBs) can be considered TRPs. Two types of multi-TRP transmission are possible for PDSCH.

[0039] · Single DCI-based multi-TRP: A single DCI schedules the transmission of (one or more) PDSCHs from two or more TRPs, i.e., the (one or more) PDSCHs can be multiplexed in the spatial domain, time domain, and / or frequency domain. When the (one or more) PDSCHs are multiplexed to the UE in the spatial domain, time domain, and / or frequency domain from different TRPs, the TCI field of the DCI may indicate two or more TCI states to indicate QCL assumptions for the reception of a single PDSCH or multiple parts of multiple PDSCHs. The TCI field of the PDSCH scheduling DCI in 3GPP Rel.15, which supports only single-TRP transmission from a single DCI, indicates only one TCI state for the scheduling of the PDSCH. The TCI field is of size b bits and can indicate up to 2b different TCI states. However, the upper layer may configure TCI states with T≧2 b . For the purpose of indication via the TCI field for the PDSCH, the UE can receive a MAC-CE message that narrows down and selects 2 b TCI states from the T TCI states configured via the upper layer such that each code point of the TCI field maps to a TCI state. To support single DCI-based multi-TRP transmission, in 3GPP Rel.16, a MAC-CE message is introduced that provides the mapping of one or more upper layer configured TCI states with the code points of the TCI field to the UE.

[0040] • Multi-DCI based multi-TRP: In this scenario, at a given time, a UE may receive multiple PDSCHs, each scheduled by a different DCI. CORESETpoolIndex is a parameter introduced in 3GPP Rel.16[4] in the configuration of a CORESET that may be used in this scenario. This parameter or index may be used to group CORESETs into different pools according to the TRP to which the CORESET is associated, in the case of multi-TRP transmissions. PDCCHs transmitted on a CORESET configured with the same CORESETpoolIndex value may be considered to be associated with the same TRP. A CORESET belonging to or associated with a CORESETpoolIndex means that the higher-layer configuration of the CORESET may include the CORESETpoolIndex(value). If a UE is configured by a network node with multiple CORESETpoolIndex values, the UE understands that it may receive multiple PDSCHs that may overlap in the time domain and frequency domain, scheduled by multiple PDCCHs received on CORESETs configured with different CORESETpoolIndex values, i.e., CORESETs associated with different TRPs.

[0041] Link adaptation for multi-frequency band, multi-beam, and / or multi-TRP / panel downlink-based transmission requires knowledge of the CSI from the UE to the serving gNB for each frequency band, beam, and / or TRP. CSI knowledge facilitates dynamic scheduling of transmissions to adapt to changing channel conditions between the UE and one or more TRPs / panels on one or more frequency bands or beams. This allows network nodes or gNBs to switch transmissions "on" or "off" or adapt the link's transmission parameters (e.g., modulation and coding scheme / rate, i.e., MCS, number of layers, precoding, etc.) for each frequency band, beam, and / or TRP. In modern technology, various CSI quantities such as PMI, RI, and CQI may only be reported for one resource from a given set of resources. The UE cannot report CSI for multiple resources it may be related to. To enable dynamic multi-frequency band, multi-beam, and / or multi-TRP / panel-based downlink transmissions, the UE may provide CSI for one or more resources to one or more network nodes. Such a CSI report may include the following information:

[0042] • Selected (one or more) TRPs, (one or more) panels, (one or more) beams, and / or (one or more) frequency bands suitable for downlink transmission (this information may be indirectly conveyed by the associated resource report). Transmit parameters relating to selected (one or more) TRPs, (one or more) beams, (one or more) panels, and / or (one or more) frequency bands. The TRP, (one or more) panels, (one or more) beams, and / or frequency bands selected by the UE for transmission may depend on the following aspects:

[0043] • The UE's ability to receive transmissions across multiple frequency bands or from multiple TRPs / panels / beams. • Quality of Service (QoS) or (one or more) data rate requirements for the UE, and • Power-saving conditions, for example, the UE may determine that it may need to consume less power and therefore select a reduced number of (one or more) frequency bands and / or (one or more) TRPs / (one or more) panels / (one or more) beams for communication.

[0044] Therefore, evaluation and reporting of channel conditions by the UE for multiple TRPs, panels, beams, and / or frequency bands can enhance resource scheduling by the gNB.

[0045] Please note that the information in the above sections is intended solely to deepen understanding of the background of the invention, and therefore may contain information that does not constitute prior art already known to those skilled in the art.

[0046] Further portions of this disclosure provide methods for configuring CSI reports, as well as for the relevant resources required for channel and interference measurements by the UE.

[0047] The following provides a method and apparatus for enhancing CSI reporting for multiple downlink resources in wireless communication networks such as advanced 5G networks. [Overview of the Initiative]

[0048] As described above, the object of the embodiments described herein is to provide methods and apparatus for enhancing CSI reporting. According to one aspect of several embodiments of this specification, a method is provided which is performed by a UE, the method comprising: receiving a CSI report configuration from a network node via one or more CSI configurations that provides N reference signal (RS) resources for channel measurement; performing measurements on the N RS resources; calculating or determining one or more CSI quantities for M selected RS resources; and sending a CSI report containing the calculated or determined CSI quantities to the network node, the CSI report comprising two parts, namely part 1 and part 2, wherein the contents contained in part 1 indicate the size of part 2.

[0049] According to another aspect of the embodiments of this specification, a UE is provided comprising a processor and a memory containing instructions executable by the processor, wherein the UE is operable or configured to perform any one of the embodiments presented in the detailed description relating to the actions performed by the UE.

[0050] According to one aspect of several embodiments of this specification, a method is provided that is performed by a network node or gNB, the method comprising: sending a CSI report configuration to a UE via one or more CSI configurations that provides N reference signal (RS) resources for channel measurements, in order to enable the UE to perform measurements on N reference signal (RS) resources and calculate or determine one or more CSI amounts for M selected RS resources; receiving a CSI report from the UE, which includes the calculated or determined CSI amounts, the CSI report comprising two parts, namely part 1 and part 2, wherein the contents contained in part 1 indicate the size of part 2; and decoding part 1 of the CSI report in order to determine the payload size of part 2 of the CSI report, thereby enabling the network node to decode the CSI report.

[0051] According to another aspect of the embodiments of this specification, a network node is provided comprising a processor and a memory containing instructions executable by the processor, wherein the network node is operable or configured to perform any one of the embodiments presented in the detailed description relating to the actions performed by the network node.

[0052] Also provided is a computer program that, when executed on at least one processor of the UE, includes instructions causing at least one processor to perform an action or method step presented herein.

[0053] Also provided is a computer program that, when run on at least one processor of a network node, includes instructions causing at least one processor to perform the method steps presented herein.

[0054] A medium containing a computer program is also provided, which may be a computer-readable storage medium, an electronic signal, an optical signal, or a wireless signal. The advantage of the embodiments described herein is that they enhance CSI reporting. Further advantages of the embodiments described herein are provided in the detailed description of this disclosure. [Brief explanation of the drawing]

[0055] [Figure 1] This is a simplified diagram of a wireless communication network, including the core network and the wireless access network. [Figure 2] This diagram shows the upper layer configuration of CORESET (State-of-the-Art Technology (SoTA)). [Figure 3] This figure shows the RRC configuration of the TCI state information elements (SoTA). [Figure 4] This is a flowchart of the methods performed by the UE in several embodiments. [Figure 5]This is a flowchart of a method performed by network nodes according to several embodiments. [Figure 6] Block diagrams of UEs according to some embodiments of this specification. [Figure 7] Network nodes according to some embodiments of this specification. [Modes for carrying out the invention]

[0056] In the following, a detailed description of exemplary embodiments is provided in conjunction with the drawings in several scenarios to facilitate a better understanding of the (one or more) solutions described herein.

[0057] This disclosure provides a novel method for CSI reporting and CSI resource configuration for scenarios in which a DL channel is provided from a network node (or gNB) across multiple frequency bands or bandwidth portions (BWPs), from multiple transmit / receive points (TRPs), or across panels from one or more TRPs or beams in a given time instance within one or more cells. Using the proposed CSI reporting and CSI resource configuration method, a network node can dynamically schedule multiple frequency bands / BWPs and / or TRPs / panels / beams for downlink transmission, switch links associated with specific frequency bands / BWPs or TRPs / beams and UEs in the DL "on" or "off", and adapt links associated with specific frequency bands / BWPs or TRPs / beams and UEs based on CSI reported by the UE.

[0058] Furthermore, some embodiments of this specification relate to methods for measuring a reference signal and reporting a CSI for provided CSI report configuration information. Throughout the present disclosure, CSI-RS resources refer to non-zero power (NZP) CSI-RS resources, unless otherwise specified. Also, in this specification, CSI-IM resources refer to zero power (ZP) CSI-RS resources, unless otherwise specified. A CSI resource may refer to an SSB or a CSI-RS resource from which one or more CSI quantities may be provided or evaluated or reported.

[0059] According to one embodiment, a method performed by a UE includes the following. ·Receiving, from a network node (or gNB), a CSI report configuration that provides N reference signal (RS) resources for channel measurement via one or more CSI resource settings. Here, the N reference signal resources may be CSI-RS or SSB resources, or a mixture of CSI-RS and SSB resources.

[0060] ·Performing measurements on the N reference signal resources provided for channel measurement in the CSI report configuration. ·Calculating or determining one or more CSI quantities for M selected reference signal resources.

[0061] ·Transmitting a CSI report including the calculated CSI quantities for the M selected resources to the network node. Here, the CSI report includes two parts, namely part 1 and part 2, and the content included in part 1 indicates the size or payload size of part 2 of the CSI report.

[0062] According to an exemplary embodiment, the CSI report may be composed of P parts, part 1 (i.e., the first part) has a fixed payload size, the size of part p, 1 < p ≤ P is indicated or determined by the content of part q, 1 ≤ q < p, P may be less than or equal to M, M may be less than or equal to N, and M may be greater than or equal to 1.

[0063] According to one embodiment, the aforementioned CSI report includes at least one of the following CSI quantities: • A Channel Resource Identifier or CSI-RS Resource Indicator (CRI) that indicates a subset or combination of CSI-RS resources (from among the CSI-RS resources provided in the CSI report configuration). • An SSB Resource Identifier (SSBRI) that indicates a subset or combination of SSB resources (from among the SSB resources provided in the CSI report configuration). • Rank indicators (RIs) associated with a resource that show the rank value for a CSI resource, or RIs that show a combination of rank values ​​for a subset of CSI-RS resources in a CSI report (e.g., indicated by CRIs). • Channel Quality Indicators (CQIs) that indicate one or more CQI values ​​for a subset of CSI-RS resources (e.g., resources indicated by CRI or SSBRI). • Layer Indicator (LI) value • A precoding matrix indicator (PMI) that shows one or more precoding matrices for a subset of CSI-RS resources (e.g., as indicated by CRI). According to one embodiment, the CSI report includes one or more CSI quantities, each CSI quantity associated with at least one of M selected reference signal resources. The M selected reference signal resources are shown in the CSI report.

[0064] As mentioned above, a CSI report, when indicated as a report quantity in the CSI report configuration, includes at least one of the following CSI report quantities for each of the M resources associated with the CSI report: RI, PMI, CQI, and LI. For example, if the CSI report configuration indicates "RI / PMI / CQI", the UE reports three quantities for each of the M CSI-RS and / or SSB resources associated with the CSI report.

[0065] The reason for segmenting the CSI report into at least two parts is that the CSI in the CSI report (i.e., one or more reported CSI quantities) can be associated with a subset or combination of M out of the N configured resources for channel measurement, where the subset of M resources and the value of M can be freely selected by the UE. Since the payload size of the CSI report depends on the selected value M, which is unknown to the network node, it is beneficial to segment the CSI report into P parts, where part 1, the first part, has a fixed payload size known to the network node. In the first option, each part p (1 ≤ p < P) can indicate the size of part p + 1. In the second option, part 1 indicates the sizes of all parts p (1 < p ≤ P). Here, it is assumed that the value M is less than or equal to N and P is less than or equal to M. As a special case, when M is 2 or more, the CSI report includes P parts, where P = 2. Thus, after receiving the CSI report by the network node and decoding part 1 of the CSI report, the payload size of the subsequent or remaining parts of the CSI report can be derived, enabling the network node to decode the complete CSI report.

[0066] For example, as described above, the CSI report provided by the UE to the network node includes two parts, namely part 1 and part 2, and the content included in part 1 indicates the size of part 2. After decoding part 1 of the CSI report, the gNB knows the size of part 2 of the CSI report. In another example, the CSI report consists of three parts, namely part 1, part 2, and part 3. Part 1 indicates the size of part 2, and part 2 indicates the size of part 3. After decoding part 1 (which has a fixed size), the gNB knows the size of part 2 and can decode part 2. After decoding part 2, the gNB knows the size of part 3 and can decode part 3.

[0067] In some examples, the size of the p-th part of the CSI report may be determined by an indicator (bitfield) included in part q (q < p) of the CSI report. In some examples, the existence of a part of the CSI report is determined by one of a bitmap or an indicator field in one of the previous parts of the CSI report. The size of the part may be determined by the CSI quantity included in the CSI report. If the part exists, the size is predefined, and if it does not exist, the size is zero. The CSI quantities to be reported may be provided in the CSI report configuration or they may be known to the UE (e.g., they are defined in the specification).

[0068] As an example, part q can include an indicator indicating the size of part p and can also determine whether part p exists. For example, the CRI can determine the resources for which CSI is to be reported. For example, if two resources are indicated by the CRI, the report can comprise one or two parts.

[0069] The above CSI reporting method is beneficial when the UE needs to calculate CSI (i.e., one or more CSI quantities) based on multiple subsets of resources or combinations of resources, where each subset of resources or each combination of resources is associated with, for example, a combination of frequency bands or bandwidth parts, or a combination of beams or TRPs. The UE can determine the frequency band or bandwidth part for operation or the subset or combination of TRPs / beams to be used for joint transmission. Thus, the above CSI reporting method enables dynamic frequency band or TRP selection and / or scheduling for joint transmission.

[0070] A non-limiting example of a special case would be a CSI report configuration that provides two resources that could be associated with two frequency bands or ports from two different TRPs, or two different beams from one or more TRPs. CSI can help the scheduler in gNB determine the optimal subset or combination of associations with (one or more) frequency bands or (one or more) TRPs or (one or more) beams.

[0071] According to one embodiment, a CSI report may include P parts, the first part including one or more CSI quantities associated with a first selected CSI-RS or SSB resource, and the p-th part including one or more CSI quantities associated with the p-th selected CSI-RS or SSB resource. In some examples, P=M. As a special case, the CSI report may include two parts (P=2), the first part including one or more CSI quantities associated with a first selected CSI-RS or SSB resource, and the second part including one or more CSI quantities associated with the remaining (M-1) selected CSI-RS and / or SSB resources. In an alternative example, the first part of the CSI report indicates at least R of the M selected CSI-RS or SSB resources associated with one or more CSI quantities in the CSI report, where 1 ≤ R ≤ M. The value R may be shown to the UE via a higher layer or may be defined in the specification. In another alternative example, the (p-1)th part of the CSI report shows the CSI-RS and / or SSB resources for one or more CSI quantities in the p-th part of the CSI report (1 <p≦P)。

[0072] As mentioned above, the UE consists of a CSI report configuration that provides N resources associated with one or more resource sets configured for channel measurement. The resources may be CSI-RS or SSB resources, and the resource set may be a CSI-RS or SSB resource set. The UE may be configured to send a CSI report to network nodes containing M (1 ≤ M ≤ N) or up to M selected resources (i.e., one or more CSI quantities). In some examples, the value of parameter M is: • Freely selectable by UE, or · Known a priori to UE, or • It is defined in the specifications and is known.

[0073] In some examples, the value of parameter M may be transmitted from the network node to the UE either via physical layer signaling (e.g., via DCI signaling) or via higher layer signaling (e.g., via RRC or MAC-CE signaling).

[0074] In some cases, the resources provided in a CSI report configuration may be associated with ports from different TRPs (or gNBs) or beams. If a UE consists of N resources for channel measurements, then N resources may be associated with N different TRPs or beams.

[0075] In some examples, each resource for channel measurement in a CSI report configuration may be associated with a partially overlapping or non-overlapping frequency band or bandwidth portion. This means that if a UE consists of N resources configured for channel measurement, each resource may be associated with a different frequency band or bandwidth portion.

[0076] CSI Report and Resource Configuration CSI report configuration According to one embodiment, the UE is configured to receive a CSI reporting configuration from a network node via a higher layer (e.g., RRC), and the CSI reporting configuration provides the following:

[0077] • N NZP CSI-RS or SSB resources for channel measurement, where each CSI-RS or SSB resource has a CSI-RS or SSB port with K ≥ 1.

[0078] • One or more CSI quantities that the UE should report for 1 ≤ M ≤ N resources configured for channel measurement. Resources for channel measurement may be provided to the UE via one or more "CSI-ResourceConfig" information elements configured through a higher layer (e.g., RRC). The CSI-ResourceConfig information element may comprise one or more sets of SSB and / or CSI-RS resources. In addition, the CSI report configuration may include one or more sets of resources for interference measurement. In some examples, the resources for interference measurement are CSI-IM (ZP CSI-RS) resources. In some examples, the resources for interference measurement are NZP CSI-RS or SSB resources. In some examples, the resources for interference measurement are NZP CSI-RS or SSB resources, plus CSI-IM resources.

[0079] According to several embodiments, the UE can calculate the CSI for resource n, which may be a CSI-RS or SSB resource, as follows: The channel is measured by the UE using one or more reference signals, indicated by resource n, provided by one or more network nodes.

[0080] Interference is measured using one or more reference signals indicated by one or more resources from at least one of the following: ○ CSI-IM Resources ○ One or more NZP CSI-RS or SSB resources different from resource n configured for channel measurement, or ○ One or more NZP CSI-RS or SSB resources configured for interference measurements In some cases, a correspondence may exist between resources for channel measurement and CSI-IM resources. If such a correspondence exists, interference, if applicable, is measured from the corresponding CSI-IM resource.

[0081] In some examples, the UE may be given N resources for channel measurement. The UE measures the interference corresponding to the nth resource for channel measurement from one or more of the remaining N-1 resources (resources different from resource n) for channel measurement.

[0082] In some examples, the UE may be given N resources for channel measurement and one or more CSI-IM resources. The UE measures the interference corresponding to the nth resource for channel measurement from one of the CSI-IM resources.

[0083] In some examples, the UE may be given N resources for channel measurement and one or more CSI-IM resources. The UE measures the interference corresponding to the nth resource for channel measurement from one or more of the remaining N-1 resources (different from resource n) for channel measurement, and from one CSI-IM resource.

[0084] In some examples, the UE may be given N resources for CSI and N CSI-IM resources for CSI report configuration. The UE measures interference from the nth CSI-IM resource corresponding to the nth resource for channel measurement. A one-to-one correspondence exists between the N resources for channel measurement and the N CSI-IM resources, and each resource for channel measurement may be associated with a separate CSI-IM resource.

[0085] In some examples, the UE may be given N resources for channel measurement, N CSI-IM resources for interference measurement, and N NZP-CSI-RS resources. The UE measures the interference corresponding to the nth resource for channel measurement from the nth CSI-IM resource and the nth NZP-CSI-RS resource for interference measurement.

[0086] The current CSI reporting configuration used in NR specifications [4],[6] needs to be modified to allow the UE to report CSIs for multiple CSI-RS and / or SSB resources that may be reported in one or more parts. For this new type of CSI reporting, the NR CSI reporting configuration needs to be modified and / or one or more new higher-layer parameters need to be introduced.

[0087] According to several embodiments, the UE is configured to receive a higher-layer configuration, such as a CSI report configuration, which includes one or more parameters indicating the reporting of one or more CSI quantities for M or up to M resources. The M resources (CSI-RS or SSB resources, or a mixture thereof) are provided as channel measurement resources in the (CSI) report configuration. In some examples, the value M may be provided or indicated by a parameter that provides the reported quantity in the CSI report configuration, by different parameters in the CSI report configuration, or by a combination of parameters provided via a higher layer. It may also be provided to the UE via a MAC-CE message. At least one of the CSI quantities provided in the CSI report configuration is reported by the UE for two or more related CSI-RS and / or SSB resources. In one example, if the CSI report configuration indicates CSI quantities RI, PMI, and CQI, then three CSI quantities are reported by the UE for two or up to M CSI-RS and / or SSB resources. In a CSI report, the resources, combinations of resources, or number of resources for which the CSI amount is provided may be configured via higher layers, selected by the UE, or known by the UE and defined in the specification.

[0088] CSI Resource Configuration Channel and interference measurement resources are provided via the higher-layer information element CSI-ResourceConfig, which provides CSI resource settings for CSI report configurations. One or more sets of NZP CSI-RS and / or SSB and / or CSI-IM resources are provided in the CSI-ResourceConfig information element (IE). A CSI report configuration shows a resource setting for channel measurement (CSI-ResourceConfig), one resource setting for interference measurement from CSI-IM resources, and / or one resource setting for interference measurement from NZP-CSI-RS or SSB resources, where applicable. In the following embodiments, methods for configuring CSI resource settings for various purposes of CSI reporting are provided, as described above.

[0089] According to several embodiments, a CSI report configuration is linked to one or more CSI resource settings, and the CSI report configuration provides at least one of the following settings:

[0090] • One or more CSI resource configurations, each providing one or more sets of DL RS resources for channel measurement. • One or more CSI resource settings, each providing one or more sets of CSI-IM resources for interference measurement. • One or more CSI resource settings, each providing one or more sets of DL RS resources for interferometry. In some examples, the number of CSI resource settings (one or more) for channel measurements, and / or the number of CSI resource settings (one or more) for interference measurements from CSI-IM resources, and / or the number of CSI resource settings (one or more) for interference measurements from CSI-RS or SSB resources is equal to the number of frequency bands or TRPs or beams to which the resources are associated. For example, it is equal to the number of CORESET pool index values ​​in a given cell, or the maximum number of TCI states mapped to a single TCI field code point in DCI.

[0091] According to one embodiment, the UE can measure the interference of the CSI resource setting k with resource m from the following: • One or more resources associated with one or more CSI resource settings k' (k'≠k) for channel measurement, and / or • One or more resources associated with one or more CSI resource configurations that provide one or more CSI-IM resources and / or one or more DL RS resources for interferometry. In some examples, the CSI reporting configuration provides the following:

[0092] • One CSI resource configuration for channel measurement. • One CSI resource configuration for interferometry including CSI-IM resources, and one CSI resource configuration for interferometry including CSI-RS or SSB resources, and / or • A single CSI resource configuration for interference measurement, including either a CSI-IM resource, a CSI-RS resource, or an SSB resource.

[0093] Next, the UE can measure the interference corresponding to resource m for channel measurement from the following: • One or more resources other than resource m associated with the CSI resource configuration for channel measurement, and / or • One or more resources associated with CSI resource configuration for interference measurement.

[0094] In some cases, there are non-zero-power CSI-RS or SSB interference resources corresponding to each channel resource. These may be resources associated with interfering TRPs or partially overlapping frequency bands.

[0095] According to one embodiment, the UE is provided with a CSI report configuration that includes the same number of NZP-CSI-RS or SSB resources for interference measurements via one or more resource configurations as there are resources for channel measurements. For example, if two resources are provided for channel measurements, there may also be two resources provided for interference measurements (NZP-CSI-RS resources, or SSB resources, or a mixture of both), and each channel measurement resource has a corresponding NZP-CSI-RS or SSB resource interference measurement.

[0096] In the case of multi-TRP / panel, multi-beam, or multi-frequency band transmissions, a channel resource m, from which various CSI quantities are evaluated by the UE, can itself function as an interference resource for one or more channel resources different from resource m. This means that the UE can be configured to assume, for interference measurements, that one or more channel resources different from resource m are the interference resources. Explicitly indicating a channel resource that can function as an interference resource for another channel resource may be necessary in some contexts. For example, this may be necessary in FR2 scenarios where spatially selective beams are required for communication. When beamforming is used for reception, the interference measurement resource should be measured with the same Rx beam as the channel resource, thereby allowing for the measurement of interference caused by other resources when a beam suitable for a particular channel resource is used. If only the channel measurement resource is given, the UE measures each resource using the respective beam for the channel measurement resource. Thus, channel resource r, which may be another channel resource, can be measured. c Interference resource r i is the channel resource r c To measure the corresponding interference, resource r c It does not have to be received by the corresponding beam. Therefore, the explicit configuration of (one or more) corresponding interference resources can help transmit the same resource in different instances, thereby helping the UE switch beams or, in general, modify the settings for measurements between channel measurements and interference measurements of the same resource.

[0097] According to one embodiment, the UE is configured to use one or more CSI resources for interference measurement, or one or more sets or groups of resources configured for channel measurement. This can mean, for example, that the UE is provided with a CSI report configuration by a network node, where one or more CSI resources configured for channel measurement, or one or more sets or groups of resources configured for interference measurement, may be configured for interference measurement. In another example, the UE may be provided, via instructions from the specification, to use one or more CSI resources for interference measurement, or one or more sets or groups of resources configured for channel measurement. The ordering or identifiers of (one or more) resources for channel measurement may be the same as or different from the ordering or identifiers of (one or more) resources for interference measurement, i.e., the same resource may be the same as (one or more) resources configured for channel measurement. i It may also be the second resource, and the r of (one or more) resources configured for interference measurement j It may be the second resource, r i ≠r j In one alternative example, for the x-th channel measurement resource, interference may be measured from the x-th interference measurement resource. In another alternative example, for the x-th channel measurement resource, interference may be measured from one or more resources different from the x-th interference measurement resource.

[0098] An example of a multi-TRP scenario may be as follows: The CSI report configuration can provide two resources {r1,r2} using the CSI resource settings configured for channel measurement. For interference measurement, the associated CSI resource settings provide the same resources in one of the following orderings: I1={r1,r2} or I2={r2,r1}.

[0099] When the first ordering I1 is used for interference measurement, for the first channel measurement resource r1, interference is measured from the second interference measurement resource r2, and for the second channel measurement resource r2, interference is measured from the first interference measurement resource r1.

[0100] When the second ordering I2 is used for interference measurement, for the first channel measurement resource r1, the interference is measured from the first interference measurement resource r2, and for the second channel measurement resource r2, the interference is measured from the second interference measurement resource r1.

[0101] A channel resource can be measured as an interference resource for a different channel resource, but some of the settings associated with the resource may change when measured as an interference resource. The following embodiments provide some of the settings that may change.

[0102] According to some embodiments, one or more CSI resources, or one or more sets or groups of resources, provided by the CSI report configuration for channel measurement may be provided for interference measurement via the same CSI resource configuration or different CSI resource configurations. The values ​​of one or more of the following parameters associated with the CSI resource configuration or resources associated with the resource configuration used for interference measurement may differ from the values ​​of the corresponding parameters associated with the CSI resource configuration or resources associated with the resource configuration used for channel measurement.

[0103] • An identifier (ID) used for one or more resources in resource ordering or resource configuration. • Aperiodic triggering offset of (one or more) resource sets when the CSI resource configuration provides (one or more) aperiodic resources. • The time-domain behavior or periodicity (aperiodic, semi-permanent, or aperiodic) of the (one or more) resources provided in the resource configuration. • Periodicity and offset of one or more resources • QCL configuration or assumptions for one or more resources The above statement could mean one of the following:

[0104] The CSI resource settings for channel and interference measurements provided by the gNB may differ, and / or the configuration of one or more of the parameters may differ. In this case, the gNB may provide such configurations, or the UE may anticipate such configurations.

[0105] The settings corresponding to one or more of the aforementioned parameters applied by the UE to one or more resources that support channel measurement and interference measurement may differ. The difference in parameters between two resource configurations can be used to adapt the transmission of the resource according to the UE's ability to switch beams or modify measurement parameters (such as the QCL assumptions applied), so that the resource may be measured as a channel resource during one transmission occasion and as an interference resource during another occasion.

[0106] Spatial reception conditions In frequency range 2 (FR2), i.e., for carrier frequencies greater than 6 GHz, DL transmissions are received at the UE using a spatially selective Rx beam. If a particular beam is used for receiving and measuring resources for channel measurement, the same beam should be used for receiving and measuring (one or more) interference measurement resources associated with the channel measurement resources. Once the UE identifies an Rx beam suitable for receiving the channel measurement resources, the interference conditions when receiving the resources using that beam must be determined. Therefore, interference resources are measured using the same Rx beam used for channel measurement.

[0107] According to one embodiment, the UE is configured to apply a “QCL-type D” pseudo-collocation assumption with respect to the channel measurement resource in order to measure (one or more) interference measurement resources associated with the channel measurement resource, where applicable. Thus, for a given Rx beam of the UE, the channel and interference can be uniquely measured. This means at least one of the following:

[0108] The UE uses the same spatial domain Rx filter for receiving and / or measuring channel measurement resources and associated (one or more) interference measurement resources. The UE derives a spatial domain Rx filter for receiving and / or measuring channel measurement resources and associated (one or more) interference measurement resources from a DL RS provided by the network, or from a DL RS used by the UE to derive a spatial domain Rx filter for channel measurement resources.

[0109] The UE expects the channel measurement resource and associated (one or more) interference measurement resources to be configured by the network node with the same DL RS for "QCL-typeD".

[0110] • The reference signals associated with the channel measurement resource and its associated (one or more) interference measurement resources are transmitted using the same spatial domain transmit filter. In a multi-TRP scenario, if the UE provides CSIs to multiple CSI resources, resources other than resource m associated with other TRPs configured for channel measurement may act as sources of interference for resource m from a particular TRP used for channel measurement. The UE may be instructed to treat (one or more) channel measurement resources different from resource m as (one or more) interference measurement resources, or (one or more) interference measurement resources for each channel measurement resource may be explicitly provided to the UE, even if they are configured as part of the channel measurement resource.

[0111] Indication of Selected CSI-RS Resources in the CSI Report According to one embodiment, the CSI report includes a CSI-RS resource indicator (CRI) or CRI field that indicates one or more selected CSI-RS resources associated with the CSI report.

[0112] According to one embodiment, the CRI or CRI field includes M components or parts for M selected CSI-RS resources to which the CSI quantity is associated in the CSI report. Each component or part of the CRI represents one of the M selected CSI-RS resources.

[0113] According to one embodiment, the CRI or CRI field in a CSI report is associated with the number of code points, where each code point is associated with a combination or subset of CSI-RS resources configured for channel measurement in the CSI report configuration. The association of code points to combinations of CSI-RS resources may be configured via a higher layer (e.g., RRC or MAC-CE), or it may be known a priori to the UE and defined in the specification. In some examples, the association of code points to combinations of CSI-RS resources is a higher layer configuration included in the CSI report configuration. If the number of code points is X, the CRI field is

[0114]

number

[0115] It has a bit size. In some examples, the UE consists of three CSI-RS resources for channel measurement: CSI-RS resource #1, CSI-RS resource #2, and CSI-RS resource #3. There are seven possible combinations of CSI-RS resources: (resource 1), (resource 2), (resource 3), (resource 1, resource 2), (resource 1, resource 3), (resource 2, resource 3), and (resource 1, resource 2, resource 3).

[0116] In one example, as shown in Table 2 below, seven possible combinations are associated with seven code points, and the CRI or CRI field is represented by a 3-bit indicator.

[0117] [Table 2]

[0118] In another example, the CRI code points are configured via a higher layer and correspond to a subset of four combinations of three CSI-RS resources configured for channel measurement in the CSI report configuration. Table 3 shows an example of a 2-bit size CRI indicator associated with four code points.

[0119] [Table 3]

[0120] In another example, the UE consists of two CSI-RS resources for channel measurement. As shown in Table 4 below, three possible combinations are associated with three code points, and the CRI or CRI field is represented by a 2-bit indicator.

[0121] [Table 4]

[0122] In another example, the code points in the CRI field correspond to all possible combinations of CSI-RS resources configured for channel measurement in the CSI report configuration. The association of code points to combinations or subsets of CSI-RS resources may be configured at a higher layer or defined in the specification. In some examples, the UE is configured with two CSI-RS resources for channel measurement, resulting in three possible combinations of CSI-RS resources: (resource 1), (resource 2), and (resource 1, resource 2). Each code point in the CRI corresponds to one combination of CSI-RS resources.

[0123] If the number of possible combinations is X, the CRI field is

[0124]

number

[0125] It has a bit size. In some examples, a CRI indicating selected CSI-RS resources to which one or more CSI quantities are associated is included in part 1 of the CSI report. In such cases, the number of CSI-RS resources indicated by the CRI defines the payload size of the remaining parts of the CSI report (one or more).

[0126] In one embodiment, the CSI report comprises two parts, namely part 1 and part 2, with a first CRI and a second CRI, where the first CRI is included in part 1 and indicates a single selected CSI-RS resource. In this embodiment, part 1 may include one or more CSI quantities relating to the single CSI-RS resource indicated by the first CRI. The second CRI is included in the remaining (one or more) parts of the CSI report and indicates the remaining CSI-RS resources. One or more CSI quantities included in the remaining (one or more) parts of the CSI report are associated with the (one or more) CSI-RS resources indicated by the second CRI. The second CRI indicates one or more CSI-RS resources that are different from the CSI-RS resources indicated by the first CRI.

[0127] In one embodiment, a bitmap of size N×1 representing M CSI-RS resources is included in or provided in the CSI report, where M CSI-RS resources are associated with the CSI quantity of the CSI report, and N represents the number of CSI-RS resources configured for channel measurement in the CSI report configuration. Each bit of the bitmap is associated with a CSI-RS resource configured for channel measurement. The CSI report contains CSI (i.e., one or more CSI quantities) relating to M, or up to M, CSI-RS resources, where the value M is freely selected by the UE, configured via a higher layer, or defined in the specification.

[0128] According to one embodiment, the bitmap may contain M "1"s or up to M "1"s, with the remaining bits being "0". The "1"s in the bitmap or bit sequence may indicate that the associated CSI-RS resource has been selected by the UE and that the CSI in the CSI report is associated with the selected CSI-RS resource. The bitmap may be a new field in the CSI report, or the CRI may be provided as the bitmap.

[0129] In one embodiment, a bitmap showing one or more subsets of resources, resource pairs, or resource combinations is included in or provided in the CSI report, where the (one or more) resources in the (one or more) subsets or resource combinations are configured for channel measurement, and each bit in the bitmap is associated with one subset or one resource combination of resources. Furthermore, the CSI report includes CSI amounts associated with one or more subsets or resource combinations of resources shown by the bitmap. In some examples, the bitmap is shown in part 1 of the CSI report.

[0130] In one embodiment, the CRI code point corresponds to all possible combinations of CSI-RS resources configured for channel measurement in the CSI report configuration. According to one embodiment, the CRI or CRI field is

[0131]

number

[0132] Represented by a bit indicator, each code point of the bit indicator is associated with a combination of m or M CSI-RS resources. In some examples, the UE provides a value M in the CSI report. The value M is either freely selected by the UE, configured by the network node via a higher layer, or defined in the specification. In some examples, the CRI, which indicates the selected CSI-RS resources to which the CSI is associated, is included in part 2 of the CSI report.

[0133] According to one embodiment, the CSI quantity provided in the CSI report is associated with M CSI resources, and the CSI report comprises P parts, where part 1 of the CSI report may contain CRIs representing CSI resources 1 ≤ Q ≤ M. When all M resources are represented in the first part, i.e., Q = M, parts p = 2, ..., P of the CSI report do not contain CRIs. When Q = M = 1, the CSI report comprises only a single part.

[0134] Instructions for CSI-RS resource combinations in CSI report configuration. According to one embodiment, the UE is configured to receive instructions (e.g., CSI resource instructions) from a network node for one or more subsets or combinations of N resources provided for channel measurement in a CSI report configuration.

[0135] The reason for CSI resource instructions or indicators is to reduce the complexity of the UE for CSI calculations. Without CSI resource instructions, the UE can freely select M resources from N configured resources in the CSI report configuration, which means the UE can,

[0136]

number

[0137] It is necessary to calculate the CSI (i.e., the CSI quantity) for each resource combination. Depending on the values ​​N and M, the number of resource combinations and the corresponding UE complexity for CSI calculation can be very large. To reduce the complexity of the UE, network nodes can present the UE with a reduced set of resource combinations for CSI calculation. For the presented reduced set of resource combinations, the UE can perform channel and / or interference measurements on the received reference signal and evaluate the corresponding CSI quantity. Also, from a network perspective, the number of possible resource combinations can be strongly limited, for example, due to scheduling constraints imposed by gNBs (or network nodes).

[0138] According to exemplary embodiments, the CSI report configuration includes a CSI resource indicator, which provides indication of one or more subsets or combinations of resources. In some examples, as described above, each subset or combination of resources indicated by the CSI resource indicator is associated with a CRI code point, and the CRI is provided in the CSI report. In some examples, the indicator indicates two groups of resources, each group comprising one or more resources configured for channel measurement. In one example, each resource in the subset of resources (one or more) in a group is mapped to one CRI code point, as described above, and one or more resource combinations from the two groups are mapped to one or more CRI code points, with each resource combination comprising a resource pair, where the resource pair comprises one resource from each group. For example, the first group may include (Resource 0) and (Resource 1), the second group may include (Resource 2) and (Resource 3), and the mapping of resources to CRI code points is as follows, and the mapping is configured in the upper layer or known by the UE (i.e., defined in the NR specification): (Resource 0) is mapped to the first CRI code point, (Resource 2) is mapped to the second CRI code point, and the resource pair {(Resource 1), (Resource 3)} is mapped to the third CRI code point. Note that each CRI code point is associated with a subset of resources configured for channel measurement and measurement hypotheses.

[0139] In some cases, a measurement hypothesis related to a single resource can be enabled / disabled via a higher layer (e.g., RRC). In some cases, a measurement hypothesis related to a pair of resources can be enabled / disabled via a higher layer (e.g., RRC).

[0140] In some examples, there is a one-to-one mapping between resources and measurement hypotheses. This means that each resource is associated with only one measurement hypothesis. For example, suppose each resource for channel measurement provided in the CSI report configuration is associated with a TRP, and a resource combination can refer to a combination of TRPs that can be used for joint downlink data transmission to the UE. Due to scheduling constraints by the gNB, only a small number of TRP combinations may be supported for joint transmission to the UE. In one example, the UE consists of three resources, namely resource #1, resource #2, and resource #3, and the three resources are associated with three different TRPs. The network can support transmissions for TRP1, TRP2, and TRP3, and joint transmissions for TRP pairs (TRP1,TRP2), (TRP1,TRP3), and (TRP2,TRP3), but not for the TRP pair (TRP1,TRP2,TRP3). Therefore, the network node can indicate to the UE via the CSI resource indicator the following resource combinations: (resource 1), (resource 2), (resource 3), (resource 1, resource 2), (resource 1, resource 3), and (resource 2, resource 3).

[0141] Two different embodiments are proposed below for the selection and reporting of resource combinations by the UE. In one embodiment, the UE is configured to select a single resource combination from a given set of resource combinations with respect to a specific performance metric (e.g., mutual information, capacity, throughput, or signal-to-interference noise ratio (SINR)) and to indicate the selected resource combination in the CSI report. The CSI in the CSI report is associated with the indicated resource combination. The selected resource combination may be indicated in the CSI report via CRI as described above. In another embodiment, the UE is configured to select multiple resource combinations from a given set of resource combinations with respect to a specific performance metric and to indicate the selected resource combinations in the CSI report. The CSI in the CSI report may contain multiple parts, each CSI part being associated with one indicated resource combination. The selected resource combination may be indicated in the CSI report via multiple CRIs.

[0142] In some examples, the UE is configured to report multiple CRIs in a CSI report, with each CRI associated with a selected resource or resource combination. One or more resources within the resource configuration are configured for channel measurement. Furthermore, the CSI report may include one or more CSI quantities (e.g., included in CSI Part 2), with each CSI quantity associated with a CRI. In some examples, if the UE is configured to report X+1 CRIs, the UE selects X CRIs associated with X resource pairs or resource combinations, with each resource pair or combination containing only a single resource configured for channel measurement, and one CRI is associated with a resource pair containing at least two resources configured for channel measurement.

[0143] Indication of selected RI values ​​in the CSI report. According to one embodiment, the CSI report includes one or more rank indicator (RI) values, each representing one rank value or combination of rank values ​​for a selected CSI-RS resource associated with a CSI (i.e., one or more CSI quantities) in the CSI report.

[0144] In some examples, a CSI report comprises two parts, namely Part 1 (the first part) and Part 2 (the second part), with Part 1 containing the RI indicator, which shows (one or more) selected rank values ​​for the CSI-RS resources associated with the CSI. In some examples, a CSI report comprises two parts, namely Part 1 and Part 2, with Part 2 containing the RI indicator, which shows (one or more) selected rank values ​​for the CSI-RS resources associated with the CSI.

[0145] In one embodiment, the RI includes M components for M selected CSI resources associated with the CSI quantity in the CSI report. Each component of the RI represents a rank value corresponding to one of the M selected CSI resources.

[0146] In one embodiment, the CSI report comprises the two parts described above, with part 1 containing the CSI associated with a single selected CSI-RS resource. In addition, the RI is divided into two parts, with the first part of the RI containing the rank values ​​of the CSIs included in part 1 of the CSI report, and the second part of the RI containing the rank values ​​(one or more) of the CSIs included in part 2 of the CSI report.

[0147] In one embodiment, the RI includes code points, where each code point in the RI represents a combination of rank values ​​for selected CSI-RS resources. The bit size of the RI may depend on the number of selected CSI-RS resources to which the CSI is associated in the CSI report, or it may be defined in the specification.

[0148] In some examples, the UE selects two CSI-RS resources and reports a 3-bit RI in the CSI report to indicate the two selected rank values ​​for the two CSI-RS resources. The association of the RI's code points to the rank values ​​may be configured for the UE or known by the UE and defined in the specification. Table 4 shows an example of a 3-bit RI for two CSI-RS resources.

[0149] [Table 5]

[0150] Overall rank restriction According to one embodiment, the UE is configured to receive a higher-layer parameter from the network node that indicates the rank limit of the value obtained by summing all rank values ​​included in the CSI report. This means that the UE is configured to determine if the overall rank or the sum of all rank values ​​is r i This means that the CSI report is configured to select (one or more) rank values ​​as follows: where r i This is either a higher-layer parameter or defined in the specification. For example, r iIf = 2 and the number of CSI-RS resources associated with a CSI (i.e., one or more CSI quantities) in a CSI report is given by 2, then the combinations of rank values ​​for the two resources are given by (Rank 1, Rank 2) = (1, 0), (Rank 1, Rank 2) = (0, 1), (Rank 1, Rank 2) = (1, 1), (Rank 1, Rank 2) = (2, 0), and (Rank 1, Rank 2) = (0, 2), where Rank 1 and Rank 2 represent the rank values ​​associated with the first CSI-RS resource and the second CSI-RS resource, respectively.

[0151] It should be noted that the embodiments presented above, which use CSI-RS resources and their corresponding indicators, i.e., CSI-RS resource indicators (CRIs), are also applicable to SSB resources and their corresponding indicators, i.e., SSB resource indicators (SSBRIs).

[0152] Referring to Figure 4, a method performed by the UE is provided, summarizing some of the embodiments described above. As illustrated, the method includes: (401) To receive a CSI report configuration from a network node via one or more CSI configurations that provides N reference signal (RS) resources for channel measurement.

[0153] (402) Perform the measurement on the N RS resources. (403) Calculate or determine one or more CSI quantities for M selected RS resources.

[0154] (404) Send a CSI report to a network node containing the calculated or determined CSI amount, where the CSI report comprises two parts, namely part 1 and part 2, the contents of part 1 indicating the size of part 2.

[0155] As described above, the CSI report may include P parts, and the first part of the P parts has a fixed payload size, and P may be less than or equal to M. The (one or more) payload sizes of the (one or more) additional parts p of the CSI report may be indicated or determined by the content of part q, where 1 < p ≤ P and 1 ≤ q < p. Different examples of the number of parts have already been presented. A list of CSI quantities has been presented.

[0156] As described above, according to one embodiment, the reference signal resource is a CSI-RS resource or an SSB resource, or a mixture of a CSI-RS resource and an SSB resource. The method further includes measuring a channel using one or more of the reference signals and measuring the corresponding interference using one or more resources from at least one of the following: · CSI interference management (IM) resources, · One or more non-zero power (NZP) CSI-RS or SSB resources, or · One or more NZP CSI-RS or SSB resources configured for interference measurement

[0157] The CSI report configuration is linked to one or more CSI resource settings, and the CSI report configuration provides at least one of the following settings. · One or more CSI resource settings each providing one or more sets of downlink RS resources for channel measurement · One or more CSI resource settings each providing one or more sets of CSI-IM resources for interference measurement · One or more CSI resource settings each providing one or more sets of DL RS resources for interference measurement As previously presented, the number of CSI resource settings for channel measurements, and / or the number of CSI resource settings for interference measurements from CSI-IM resources, and / or the number of CSI resource settings for interference measurements from CSI-RS or SSB resources is equal to the number of frequency bands or TRPs or beams to which the resources are associated. The method performed by the UE further includes using one or more resources, or one or more groups or sets of CSI resources configured for channel measurements, for interference measurements.

[0158] A CSI report includes a CRI or CRI field that indicates the (one or more) selected CSI-RS resources associated with the CSI report. The CRI or CRI field is associated with the number of code points, each code point being associated with a combination or subset of CSI-RS resources configured for channel measurement in the CSI report configuration.

[0159] According to an exemplary embodiment, the CSI report may include a bitmap of size N × 1 representing M CSI-RS resources, where the M CSI-RS resources are associated with the CSI quantity in the CSI report. The bitmap may have M "1"s or up to M "1"s, with the remaining bits being "0", where the "1"s in the bitmap may indicate that the associated CSI-RS resources have been selected by the UE and the CSI in the CSI report is associated with the selected CSI-RS resources.

[0160] In another exemplary embodiment, a bitmap representing one or more subsets or resource combinations is included in or provided in the CSI report, where the (one or more) resources of the (one or more) subsets or resource combinations are configured for channel measurement, and each bit of the bitmap is associated with one subset or one resource combination. Furthermore, the CSI report includes the CSI amount associated with the one or more subsets or resource combinations represented by the bitmap. In some examples, the bitmap is shown in part 1 of the CSI report. In some examples, the CRI in the CSI report is represented by the bitmap.

[0161] According to one embodiment, the CRI or CRI field is

[0162]

number

[0163] Represented by bit indicators, each code point of a bit indicator is associated with a combination of m or M CSI-RS resources. A CSI report configuration includes a CSI resource indicator that shows one or more subsets or combinations of the N resources provided in the CSI report configuration. The (one or more) subsets or combinations of resources associated with the code point of the CSI-RS resource indicator (CRI) are either configured via higher layers or defined in the specification.

[0164] According to one embodiment, the CSI report includes a rank indicator (RI) that shows a combination of rank values ​​for selected CSI-RS resources associated with the CSI report. The RI is included in a first part (Part 1) of the CSI report, or in another part of the CSI report, such as a second part (Part 2), or a third part, or a fourth part, etc.

[0165] According to one embodiment, the method includes selecting multiple CSI resources and reporting bit-size RIs in a CSR report to indicate at least some selected RI values ​​for the multiple CSI-RS resources. For example, two CSI-RS resources are selected, and a 3-bit RI is reported in the CSI report to indicate two selected RI values ​​for the two CSI-RS resources. The number of CSIs reported and the number of bits in the RI are design parameters.

[0166] According to one embodiment, the method may further include receiving a higher-layer parameter from a network node that indicates a rank limit for the value obtained by summing the RI values, as described above in the subsection “Overall Rank Limit”.

[0167] The additional actions performed by UE have already been described. Referring to Figure 5, a method is provided that is performed by a network node or gNB according to some of the embodiments described above. As illustrated, the method includes the following:

[0168] (501) Send a CSI report configuration to the UE that provides N RS resources for channel measurement via one or more CSI configurations. This enables the UE to perform measurements on the N RS resources and calculate or determine one or more CSI quantities for M selected RS resources.

[0169] (502) Receive a CSI report from the UE containing the calculated or determined CSI amount, where the CSI report comprises two parts, namely part 1 and part 2, the contents of part 1 indicating the size or payload size of part 2.

[0170] (503) Decode the first part of the CSI report (i.e., part 1) in order to determine the payload size of the subsequent part of the CSI report (i.e., part 2), thereby enabling the network node to decode the CSI report.

[0171] Additional actions performed by network nodes have already been described. A UE is also provided to perform the aforementioned process or method steps performed by the UE. Figure 6 shows a block diagram of the UE600. The UE600 comprises a processor 610 or processing circuit or processing module or processor or means 610, a receiver circuit or receiver module 640, a transmitter circuit or transmitter module 650, a memory module 620, and a transceiver circuit or transceiver module 630 which may include the transmitter circuit 650 and the receiver circuit 640. The UE600 further comprises an antenna system 660 which includes an antenna circuit for transmitting and receiving signals to and from at least network nodes. The antenna system 660 uses beamforming as described above. Actions performed by the UE600 have already been described.

[0172] The UE600 may belong to any radio access technology, including 4G or LTE, LTE-A, 5G, Advanced 5G, or a combination thereof, that supports beamforming technology. The UE, comprising a processor and memory, includes instructions that can be executed by the processor, thereby enabling or configuring the UE600 to operate to perform any one of the embodiments relating to the UE described above.

[0173] The processing module / circuit 610 may include a processor, microprocessor, application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), etc., and may be referred to as a “processor.” The processor 610 controls the operation of the network node and its components. The memory (circuit or module) 620 includes random access memory (RAM), read-only memory (ROM), and / or other types of memory for storing data and instructions that may be used by the processor 610. Generally, it will be understood that a network node in one or more embodiments includes fixed or programmed circuitry configured to perform the operation in any of the embodiments disclosed herein.

[0174] In at least one such example, the processor 610 includes a microprocessor, microcontroller, DSP, ASIC, FPGA, or other processing circuit, the other processing circuit configured to execute computer program instructions from a computer program stored in or accessible from the processing circuit. Here, “non-temporary” means at least some kind of persistent storage, although it may include storage in working memory or volatile memory, and does not necessarily mean permanent or immutable storage. Execution of program instructions involves specially adapting or configuring the processing circuit to perform the operations shown in this disclosure relating to the UE. Furthermore, it will be understood that the UE 600 may comprise additional components.

[0175] Network nodes (or gNBs) are also provided to perform the aforementioned process or method steps performed by the network nodes. Figure 7 shows an exemplary block diagram of a network node. Network node 700 comprises a processor 710 or processing circuit or processing module or processor or means 710, a receiver circuit or receiver module 740, a transmitter circuit or transmitter module 750, a memory module 720, and a transceiver circuit or transceiver module 730 which may include the transmitter circuit 750 and the receiver circuit 740. Network node 700 further comprises an antenna system 760 which includes an antenna circuit for transmitting and receiving signals to and from at least the UE. The antenna system uses beamforming as described above. Actions performed by network node 700 have already been described. Network node 700 may be considered a TRP.

[0176] The processing module / circuit 710 may include a processor, microprocessor, application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), etc., and may be referred to as a “processor.” The processor 710 controls the operation of the network node and its components. The memory (circuit or module) 720 includes random access memory (RAM), read-only memory (ROM), and / or other types of memory for storing data and instructions that may be used by the processor 710. Generally, it will be understood that a network node in one or more embodiments includes fixed or programmed circuitry configured to perform the operation in any of the embodiments disclosed herein.

[0177] In at least one such example, the processor 710 includes a microprocessor, microcontroller, DSP, ASIC, FPGA, or other processing circuit, the other processing circuit configured to execute computer program instructions from a computer program stored in or accessible from the processing circuit. Here, “non-temporary” means at least some kind of persistent storage, although it may include storage in working memory or volatile memory, and does not necessarily mean permanent or immutable storage. Execution of program instructions involves specially adapting or configuring the processing circuit to perform the operations described herein. Furthermore, it will be understood that the network node may comprise additional components.

[0178] The network node 700 may belong to any radio access technology, including 4G or LTE, LTE-A, 5G, Advanced 5G, or a combination thereof, that supports beamforming technology. The network node 700, comprising a processor and memory, includes instructions that can be executed by the processor, thereby enabling or configuring the network node 700 to operate to perform any one of the subject matter shown in this disclosure relating to a network node (or gNB).

[0179] Throughout this specification, any reference to “example” or “exemplary” means that any particular feature, structure, or characteristic described in relation to that example is included in at least one embodiment of the Art. Therefore, where the phrase “in an example” or the word “exemplary” appears in different places throughout this specification, not all instances necessarily refer to the same embodiment.

[0180] Throughout this disclosure, the words “comprise” or “comprising” are used in a non-restrictive sense, meaning “consist at least of.” Certain terms may be used herein, but they are used in a general and descriptive sense only and are not intended to be restrictive. Embodiments described herein may apply to any wireless system, including LTE or 4G, LTE-A (or LTE Advanced), 5G, Advanced 5G, WiMAX, WiFi, satellite communications, television broadcasting, etc.

[0181] References [1] 3GPP TS 38.211 V16.0.0: "3GPP;TSG RAN;NR; Physical channels and modulation (Rel. 16)", January 2020 [2] 3GPP TS 38.212 V16.0.0: "3GPP;TSG RAN;NR; Multiplexing and channel coding (Rel. 16)", January 2020 [3] 3GPP TS 38.213 V16.0.0: "3GPP;TSG RAN;NR; Physical layer procedures for control (Rel. 16)", January 2020 [4] 3GPP TS 38.214 V16.0.0: "3GPP;TSG RAN;NR; Physical layer procedures for data (Rel. 16)", January 2020 [5] 3GPP TS 38.321 V15.8.0: "3GPP; TSG RAN; NR; Medium Access Control (MAC) protocol specification (Rel. 15)", January 2020 [6] 3GPP TS 38.331 V15.8.0: "3GPP; TSG RAN; NR; Radio Resource Control (RRC); Protocol specification (Rel. 15)", January 2020 [7] 3GPP TS 38.101-1 V16.2.0: "3GPP; TSG RAN; User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone (Rel. 16)", January 2020 [8] 3GPP TS 38.101-2 V16.2.0: "3GPP; TSG RAN; User Equipment (UE) radio transmission and reception; Part 2: Range 2 Standalone (Rel. 16)", January 2020

Claims

1. The steps include receiving a CSI report configuration that provides N reference signal (RS) resources for channel measurement via at least one channel state information (CSI) configuration, The steps include performing measurements on the N RS resources, For M selected RS resources, the steps include calculating or determining at least one CSI quantity, The steps include sending a CSI report that includes the calculated or determined CSI amount, A method comprising a CSI report comprising part 1 and part 2, wherein the content contained in part 1 indicates the size of part 2.

2. The CSI amount is Channel resource identifier or CSI-RS resource indicator, A portion or combination of CSI-RS resources among the CSI-RS resources provided in the CSI report configuration, wherein each resource is associated with at least one of the CSI quantities in the CSI report, In the CSI report configuration, an SSB resource identifier is provided that represents a part or combination of SSB resources among the synchronization signal / physical broadcast channel (SSB) resources, and each resource is associated with at least one of the CSI quantities in the CSI report. A rank indicator showing a combination of rank values ​​for a portion of the CSI-RS resources in the CSI report, A channel quality indicator that shows at least one channel quality indicator value for a portion of the CSI-RS resources, Layer indicator value and, A precoding matrix indicator showing at least one precoding matrix for a portion of the CSI-RS resources, The method according to claim 1, comprising at least one of the following.

3. A step of measuring the channel using at least one of the reference signals, The corresponding interference, CSI Interference Management (IM) Resources, At least one non-zero power (NZP) CSI-RS or synchronous signal / physical broadcast channel (SSB) resource, or At least one NZP CSI-RS or SSB resource configured for interferometry, A step of measuring using at least one resource from at least one of the following, The method according to claim 1 or 2, further comprising:

4. The CSI report configuration is linked to at least one CSI resource configuration, and the CSI report configuration is Each of the CSI resource configurations provides at least one set of downlink RS resources for channel measurement, Each of the CSI resource settings provides at least one set of CSI interference management (IM) resources for interference measurement, Each of the CSI resource settings provides at least one set of DL RS resources for interference measurement. The method according to any one of claims 1 to 3, which provides at least one of the following.

5. The method according to claim 4, wherein the number of CSI resource settings for channel measurement and / or the number of CSI resource settings for interference measurement from CSI-IM resources and / or the number of CSI resource settings for interference measurement from CSI-RS or SSB resources is equal to the number of frequency bands or transmit / receive points (TRPs) to which the resources are associated.

6. The method according to any one of claims 1 to 5, wherein the CSI amount is configured via a higher layer or is defined in the specifications.

7. The method according to any one of claims 1 to 6, wherein the CSI report configuration includes a CSI resource indicator that shows one or more subsets or combinations of the N resources provided in the CSI report configuration.

8. The method according to any one of claims 1 to 7, wherein each CSI quantity is associated with at least one of M selected RS resources, the M selected RS resources being shown in the CSI report.

9. The CSI report includes a CSI-RS Resource Indicator (CRI), or a CRI field. The CRI indicates the selected CSI-RS resource associated with the CSI report. The aforementioned CRI or CRI field is associated with the number of code points, The method according to any one of claims 1 to 8, wherein each code point is associated with a combination or portion of the CSI-RS resources configured for channel measurement in the CSI report configuration.

10. The steps include selecting a single resource combination from a given subset of resource combinations, The CSI report includes the step of showing the selected resource combination via the CRI, The method according to claim 9, further comprising the above.

11. The steps include selecting multiple resource combinations from a given selection of resource combinations, The CSI report includes the step of showing the selected resource combination via multiple CRIs, The method according to claim 9, further comprising the above.

12. The method according to any one of claims 9 to 11, wherein a portion of the CSI-RS resources associated with the code points of the CRI are configured via a higher layer or as defined in the specification.

13. The method according to any one of claims 9 to 12, wherein the CRI indicating the selected CSI-RS resources is included in part 1 of the CSI report, and the number of CSI-RS resources indicated by the CRI determines the payload size of part 2 of the CSI report.

14. The method according to claim 9, wherein the association of the code points to a combination of CSI resources is configured via a higher layer, or is priori known to the UE, or is defined in the specification.

15. The method according to any one of claims 1 to 14, wherein the CSI report is configured for channel measurement and includes a bitmap showing one or more subsets or combinations of resources associated with the CSI amount of the CSI report.

16. The CRI or the CRI field is [Math 1] The method according to claim 9, wherein a bit indicator represents a bit, and each code point of the bit indicator is associated with a combination of m or M CSI-RS resources.

17. The method according to claim 1, wherein the CSI report includes a rank indicator (RI) showing a combination of rank values ​​or RI values ​​for selected CSI-RS resources associated with the CSI report, and the RI showing the selected rank values ​​for the CSI-RS resources associated with the CSI is included in portion 1 of the CSI report.

18. The method according to claim 17, further comprising the step of receiving a higher layer parameter from the network node that indicates a rank limit of a value obtained by the sum of the RI values.

19. The method according to any one of claims 1 to 18, further comprising the step of applying a pseudo-collocation (QCL) type assumption to a channel measurement resource in order to measure at least one interference measurement resource associated with the channel measurement resource.

20. The method according to claim 17, wherein the RI or RI field is associated with a number of code points, and each code point in the RI or RI field represents a combination of rank values ​​of the selected CSI-RS resource.

21. A step of transmitting a channel status information (CSI) report configuration that provides N reference signal (RS) resources for channel measurement via at least one CSI configuration, wherein the CSI report configuration enables a wireless device to perform measurements on the N reference signal (RS) resources and calculate or determine at least one CSI quantity for M selected RS resources. A step of receiving a CSI report containing the calculated or determined CSI amount, wherein the CSI report comprises part 1 and part 2, the content of part 1 indicating the size of part 2, and The steps include: determining the payload size of the portion 2 of the CSI report by decoding the portion 1 of the CSI report; A step that enables a network node to decode the CSI report, A method of having.

22. A device having a processor and memory, wherein the memory stores instructions for the processor, The aforementioned processor, The system receives a CSI report configuration that provides N reference signal (RS) resources for channel measurement via at least one Channel State Information (CSI) configuration. Perform the measurement on the aforementioned N RS resources. For M selected RS resources, calculate or determine at least one CSI quantity. Send a CSI report including the calculated or determined CSI amount. It is configured in such a way, The CSI report includes part 1 and part 2, and the content included in part 1 indicates the size of part 2, the device. Device.

23. A device having a processor and memory, wherein the memory stores instructions for the processor, The aforementioned processor, A channel state information (CSI) report configuration is sent via at least one CSI configuration, providing N reference signal (RS) resources for channel measurement. The CSI report configuration enables the wireless device to perform measurements on the N reference signal (RS) resources and calculate or determine at least one CSI quantity for M selected RS resources. A CSI report is received that includes the calculated or determined CSI amount. It is configured in such a way, The CSI report includes part 1 and part 2, the content included in part 1 indicates the size of part 2, The processor further decodes the portion 1 of the CSI report in order to determine the payload size of the portion 2 of the CSI report. The network node enables the decryption of the CSI report. A device configured in such a way.

24. A computer program that is executed by a computer and causes the computer to perform the method described in claim 1.

25. A computer program that is executed by a computer and causes the computer to perform the method described in claim 21.

Images