Methods for channel state information measurement and reporting for multiple csi sub-configurations for network power saving
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- GOOGLE LLC
- Filing Date
- 2023-09-28
- Publication Date
- 2026-07-01
AI Technical Summary
Current 5G wireless communication systems face challenges in efficiently reporting channel state information (CSI) when a CSI configuration includes multiple sub-configurations, especially when the user equipment (UE) does not receive channel measurement resources (CMR) or CMR and interference measurement resources (IMR) for all sub-configurations before the CSI reference resource.
The user equipment (UE) is configured to selectively transmit CSI reports based on the received CMR or CMR and IMR for a subset of CSI sub-configurations. The UE may drop CSI reports for sub-configurations without received resources and transmit reports only for sub-configurations with received resources, or transmit latest CSI for some sub-configurations and outdated CSI for others.
This approach enables CSI reporting in scenarios where a subset of CSI sub-configurations lacks CMR or CMR and IMR, facilitating network energy savings and optimizing CPU usage in the UE.
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Figure CN2023122371_03042025_PF_FP_ABST
Abstract
Description
METHODS FOR CHANNEL STATE INFORMATION MEASUREMENT AND REPORTING FOR MULTIPLE CSI SUB-CONFIGURATIONS FOR NETWORK POWER SAVING
[0001] FIELD OF THE DISCLOSURE
[0002] This document generally describes methods and devices operating in wireless communication systems such as, but not limited to, the ones described in 5G standard documents, known as the 3rd Generation Partnership Project (3GPP) communication systems.BACKGROUND
[0003] In wireless communications, channel state information (CSI) refers to information about the current state of the wireless communication channel between a transmitter (e.g., a base station) and a receiver (e.g., a user equipment (UE) ) . The CSI characterizes the behavior of the wireless channel by including factors such as signal strength, signal-to-noise ratio, fading, interference, and more. The CSI may be used by a network entity (NE) for resource allocation, beamforming, optimizing Multiple-Input Multiple-Output (MIMO) configurations, interference mitigation, adaptive modulation and coding, handover and mobility management, resource scheduling, and more. The CSI may be estimated / measured by the UE after comparing (1) a known CSI reference signal (CSI-RS) , which is a specific resource transmitted by the NE and used for measuring and reporting channel conditions between the UE and the NE, with (2) a corresponding measured signal. The term NE indicates a base station (BS) , a distributed unit of a distributed BS or another network device of a radio access network (RAN) in communication with the UE.
[0004] Traditionally, for a MIMO system, the CSI may provide the NE the necessary information for selecting a digital precoder for the UE. The NE may configure a CSI report by using radio resource control (RRC) signaling, e.g., CSI-ReportConfig, where the CSI-RS is used as channel measurement resource (CMR) for the UE to measure the downlink channel and to turn off some antenna elements to achieve network energy saving (NES) . The NE may also configure an interference measurement resource (IMR) , in addition to the CMR, enabling the UE to measure channel interference. CMRs are specific portions of the network resources, including time slots, frequency bands, or physical resources such as antennas, allocated for conducting channel measurements. These resources are reserved to ensure that measurement tasks do not interfere with regular data transmission activities.
[0005] Based on the configured CMR and IMR, the UE is able to report the CSI, which may include at least one of the following components: a rank indicator (RI) , a precoder matrix indicator (PMI) , a channel quality indicator (CQI) , and a layer indicator (LI) . The RI and the PMI characterize the digital precoder, the CQI indicates the signal-to-interference plus noise (SINR) status to assist the NE in determining the modulation and coding scheme (MCS) , and the LI indicates the strongest layer of the precoder indicated by the RI and the PMI.
[0006] The NE may trigger the UE to provide a CSI report based on the configured CMR or the CMR and IMR, before sending a CSI reference resource to the UE. The CSI reference resource may be located in a slot before the CSI report slot. The CSI reference resource is defined, for example, in 3GPP technical specifications, TS, 38.214.
[0007] After a specific event takes place in the network (for example, CSI report (re) configuration, serving cell activation, bandwidth part (BWP) change, or activation of semi-persistent CSI (SP-CSI) ) , the UE reports a CSI report only after receiving at least one CSI-RS transmission occasion for channel measurement or at least one CSI-RS transmission occasion for channel measurement and one CSI-RS for interference measurement, CSI-IM, occasion for interference measurement, no later than receiving the CSI reference resource, or otherwise the UE drops the report.
[0008] However, the current 5G rules for transmitting the CSI report to the NE are undefined when (1) a CSI configuration includes plural CSI sub-configurations, and (2) the UE receives, only for some (or subset) of the CSI sub-configurations, at least one of a transmission occasion for CMR or a transmission occasion for the CMR and IMR.
[0009] For example, to implement network energy savings (NES) , the NE may configure N (e.g., N>1) CSI sub-configurations in a CSI report configuration, and the NE may trigger (i.e., instruct or request) the UE to report M (e.g., 1≤M≤N) CSIs corresponding to M CSI sub-configurations. In other words, the NE may require the UE to report CSI for a subset of all the CSI sub-configurations of a given CSI report configuration. In each CSI sub-configuration, the NE may configure a list of CSI-RS resource index (es) for channel measurement (e.g., CMR) . The NE may transmit the CSI-RSs in different CSI sub-configurations based on different antenna elements with different beams. Then, based on the UE report, the NE may select the correct antenna elements for downlink transmission and turn off some antenna elements for NES.
[0010] As shown in FIG. 1, which is a timing diagram indicating signals received by the UE, when the UE partially receives (1) the CSI-RS transmission occasion for channel measurement CMR1 and CMR2, where the subindex indicates the corresponding CSI sub-configuration, and (2) CSI-RS and / or CSI-IM occasion for interference measurement IMR1 and IMR2 (only two sub-configurations are discussed in this example for simplicity) , after a given network event (for example, the CSI report (re) configuration, serving cell activation, BWP change, activation of SP-CSI) , or during UE discontinuous reception (DRX) active time, it is not clear what CSI the UE should transmit to the NE. DRX is a power-saving mechanism used by UE to conserve battery life by reducing the time it spends actively monitoring the network for incoming data or control signals. It is particularly useful for extending the battery life of UEs while still allowing them to maintain connectivity with the network.
[0011] Another problem associated with CSI reporting may appear when the NE configures the cell discontinuous transmission (DTX) by a downlink control information (DCI) to indicate the cell DTX active and inactive times, as the NE may refrain from transmitting the periodic or semi-persistent CSI-RS during a cell DTX inactive time. DTX is a power-saving technique used by NE to reduce the transmission of data when there is little or no useful information to send. This technique is employed during periods of silence or when there is no meaningful data to transmit, helping to conserve battery life and reduce interference in the network. Thus, it is unclear for the traditional methods and systems how to report the CSI information when the UE fails to measure a CSI-RS transmission occasion for a subset of, or all the CMRs or CMRs and IMRs for a CSI report configuration that includes plural sub-configurations.
[0012] A similar problem, in terms of reporting CSI, appears when the UE determines a number of required CSI processing units (CPUs) for a number of triggered CSI sub-configurations. In this regard, note that a CPU is a virtual entity (that can be implemented in software, hardware or a combination of the two) hosted by the UE and used to process channel information associated with a corresponding CSI sub-configuration. Currently, processing information associated with each CSI sub-configuration requires a corresponding CPU. Thus, for a CSI report configuration with N configured CSI sub-configurations, the UE determines the number of occupied CPUs as being given by where Ks indicates the number of configured CSI-RS resources for channel measurement associated with CSI sub-configuration s. When the number of occupied CPUs exceeds the maximum number of CPUs that the UE reports in the UE capability report, the UE may report outdated CSI (s) or drop the CSI (s) for a CSI report configuration with lowest priority. Then, it is unclear for the UE how to determine the occupied CPUs when the UE receives CMR or CMR and IMR for a subset of CSI sub-configurations.SUMMARY
[0013] To overcome the above-described problems, the UE is configured to receive from the NE a CSI report configuration including plural CSI sub-configurations, each of the plural CSI sub-configurations being associated with at least one of the CMR or at least one of CMR and IMR. Based on the received CMR or CMR and IMR for a subset of CSI sub- configurations and triggered CSI sub-configurations, the UE selectively transmits a CSI report to the NE. For example, in one implementation, the UE may drop the CSI (s) corresponding to a first set of CSI sub-configuration (s) without CMR or CMR and IMR received before the CSI reference resource, and the UE may transmit the CSI (s) corresponding to triggered CSI sub-configurations from a second set of CSI sub-configuration (s) with CMR or CMR and IMR received before the CSI reference resource. Alternatively, or instead, the UE may drop the CSI (s) corresponding to a first set of CSI sub-configuration (s) without CMR or CMR and IMR received before the CSI reference resource, and the UE may transmit the CSI (s) corresponding to the CSI sub-configurations from a second set of CSI sub-configuration (s) with CMR or CMR and IMR received before the CSI reference resource, irrespective of the triggered CSI sub-configurations. Alternatively, or instead, the UE may transmit the latest CSI (s) corresponding to the second set of CSI sub-configuration (s) and outdated CSI (s) corresponding to the first set of CSI sub-configuration (s) . Alternatively, or instead, the UE may send outdated CSI (s) for both the first and second sets of CSI sub-configurations. Alternatively, or instead, the UE may drop the whole CSI report even when CMR or CMR and IMR are received before the CSI reference resource.
[0014] In this way, the CSI reporting is possible for a situation in which a subset of CSI sub-configuration (s) is without CMR or CMR and IMR received before the CSI reference resource, and the NE implements network energy savings. CPU occupancies rules may also be established so that the UE determines the number of CPUs based on at least one of: number of configured or triggered CSI sub-configuration (s) with CMR or CMR and IMR received; number of configured or triggered CSI sub-configuration (s) ; number of CSI-RS resources for channel measurement for the configured or triggered CSI sub-configuration (s) with CMR or CMR and IMR received; number of CSI-RS resources for channel measurement for the configured or triggered CSI sub-configuration (s) ; or whether latest measured CSI or outdated CSI should be reported for the configured or triggered CSI sub-configuration (s) .BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate one or more embodiments and, together with the description, explain these embodiments.
[0016] FIG. 1 schematically illustrates a potential problem with CSI reporting with partial CMR or CMR and IMR measurements.
[0017] FIG. 2 is a block diagram of a wireless communication system in which a UE and NE perform methods according to various embodiments.
[0018] FIG. 3 is a signal diagram for CSI measurement and reporting for network energy saving according to an embodiment.
[0019] FIG. 4 is a flow chart of a UE method for CSI measurement and reporting according to an embodiment.
[0020] FIG. 5 is a flow chart of a NE method for configuring CSI reporting according to an embodiment.
[0021] FIG. 6 is a timing diagram illustrating dropping a CSI report when occasions for CMR and IMR associated with different CSI sub-configurations occur during inactive and active times according to an embodiment.
[0022] FIGs. 7-10 are timing diagrams illustrating CSI reporting scenarios in which occasions for CMR and IMR associated with different CSI sub-configurations occur during inactive and active times according to various embodiments.DETAILED DESCRIPTION
[0023] Methods and devices described in this section embody techniques related to CSI measurement and reporting for network power saving when a CSI configuration includes plural CSI sub-configurations. The embodiment descriptions in this section refer to the accompanying drawings. The same reference numbers in different drawings identify the same or similar elements. The detailed descriptions do preclude other embodiments within the scope of the appended claims. The embodiments are not limited to the described configurations but may be extended to other arrangements.
[0024] Reference throughout this section to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment. Thus, the appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout the specification are not necessarily all referring to the same embodiment. Further, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.
[0025] As discussed in more detail below, a UE, sometimes in collaboration with an NE of a RAN, uses the techniques described in this section for preparing a modified CSI report based on a CSI report configuration including multiple CSI sub-configurations. More specifically, some parts of a traditional CSI report may be omitted using a CSI report scheme that is based on (1) triggered CSI sub-configurations and (2) the received one or more CMRs or one or more CMRs and IMRs. Note that in one embodiment, a “CSI report” is the actual feedback provided by the UE about the channel conditions, while “CSI report configuration” encompasses the settings and parameters that define how CSI reports are generated and sent. CSI report configuration allows the NE and implicitly the network to control the reporting strategy to meet various communication needs and network optimization goals. Plural CSI report configurations may be used in the same system, and these configurations form a “CSI report scheme. ” Before discussing the various scenarios of dropping part or parts of the CSI report, a brief description of a wireless communication system 200 that supports the CSI report scheme is provided with regard to FIG. 2.
[0026] The wireless communication system 200 includes a UE 210 and a NE 220 (only one of each is shown for simplicity, but one skilled in the art would understand that many such elements may be present) communicating wirelessly through a link 201 and configured to enable network energy savings according to an embodiment. NE 220 may be any BS, but more generally, the term “network entity” stands for a wireless device with a well-defined network functionality (e.g., BS’s functionality is connecting UEs to the core network including managing communications to and from the UEs) . NE 220 and UE 210 may include additional functions and interfaces omitted from the figure in the interest of brevity. Signaling link 201 generally represents both uplink signals (from the UE to the NE) and downlink signals (from the NE to the UE) .
[0027] NE 220 may provide the functionality of an gNB (i.e., a 5G or 6G base station) . NE 220’s functionality may be distributed across multiple entities (e.g., a central unit, CU, a distributed unit, DU, and a radio unit, RU) . NE 220 includes one or more antennas, an RF front end 221 and a transceiver 222 for communicating with UE 210 and other UEs and NEs. NE 220’s antennas and RF front end 221 can be tuned to one or more frequency bands (e.g., subcarriers) , for example as defined by 3GPP LTE, 5G new radio (NR) , and 6G communication standards and implemented by transceiver 222.
[0028] NE 220 further includes processor (s) 223 and computer-readable storage media (CRSM) 224. Processor (s) 223 can include single or multiple-core processors, and CRSM 224 includes any suitable memory / storage except propagating signals. For example, memory / storage can include random-access memory (RAM) , static RAM (SRAM) , dynamic RAM (DRAM) , non-volatile RAM (NVRAM) , read-only memory (ROM) , and / or flash memory. CRSM 224 stores device data 225, which includes network scheduling data, radio resource management data, applications, and / or an operating system, which are executable by processor (s) 223 to enable wireless communication 201 with UE 210 as well as with other NEs and UEs.
[0029] CRSM 224 also stores a CSI configuration manager 226 and CSI report scheme manager 227. CSI configuration manager 226 causes UE 210 to configure the CSI report based on various factors, which are discussed later. Due to the availability of the CSI sub-configurations for a given CSI report configuration, the fact that the UE can receive CMR or CMR and IMR resources for a subset of the CSI sub-configurations, and also because the NE may request CSI information about specific CSI sub-configurations and not all the configurations, a CSI report scheme is implemented in this embodiment for addressing all these conditions. The CSI report scheme is managed by the CSI scheme manager 227 and includes plural CSI report configurations. CSI scheme manager 227, based on prior communications with the UE, determines which CSI report (or modified report) is received by the NE from the UE. In one application, the CSI scheme manager 227 may instruct the UE to use one or more of the available CSI report configurations.
[0030] NE 220 also includes an inter-base station interface 228 and core-network interface 229. Inter-base station interface 228 can be a standardized interface, such as an Xn and / or X2 interface, for exchanging user-plane and control-plane data with another NE (e.g., in case of a handover) . Core-network interface 229 enables NE’s user-plane data and control-plane information exchange with core network functions and / or entities.
[0031] UE 210 may be any user computing device, for example, a smartphone. UE includes antennas connected to a radio frequency (RF) front end 211, and a transceiver. The transceiver may be an LTE transceiver 212, a 5G NR transceiver 213, or another transceiver 214. Although FIG. 2 shows all three transceivers present in the UE, one skilled in the art would understand that more or less of these transceivers may be present. The antennas and RF front end 211 can be tuned to one or more frequency bands (e.g., subcarriers) , for example, as defined by 3GPP LTE, 5G NR, and 6G communication standards and implemented by respective transceivers. UE 210 also includes one or more precoders 215, one or more processor (s) 216, and computer-readable storage media (CRSM) 217. Processor (s) 216 may be single or multiple-core processors, and CRSM 217 includes any suitable memory / storage other than propagating signals. For example, memory / storage can include RAM, SRAM, DRAM, NVRAM, ROM, and / or flash memory. CRSM 217 stores device data 218 necessary for UE’s communications. The CRSM 217 may also include a CSI configuration manager 219.
[0032] CSI configuration manager 219 is configured to generate a modified CSI report, which may include information related to a subset of the CSI sub-configurations, and no information about the remaining CSI sub-configurations. In this or another embodiment, the CSI configuration manager 219 may generate the modified CSI report to include latest measured information for the subset of the CSI sub-configurations and outdated information for the remaining CSI sub-configurations. In yet another embodiment, the CSI configuration manager 226 may generate the modified CSI report to include outdated information for all the CSI sub-configurations. The CSI configuration manager 219 may also be configured to periodically report the CSI, which means that the UE provides updates to the BS 220 at predefined intervals, or it can be reported based on certain events or triggers, such as the specific network event discussed above.
[0033] The 5G NR supports different types of CSI, including wideband CSI, subband CSI, and CQI (Channel Quality Indicator) CSI. Wideband CSI provides information about the overall channel quality across the entire bandwidth, while subband CSI focuses on specific frequency subbands. CQI CSI provides feedback on the expected signal quality. The CSI report may further include various parameters RI, PMI, etc. RI, which may be part of the CSI report, indicates the number of independent data streams that can be supported by a channel. RI helps the NE determine the appropriate MIMO transmission scheme to use. The PMI indicates the optimal precoding matrix to be used for transmission from the NE to the UE. This helps in beamforming and spatial multiplexing to maximize the signal quality.
[0034] Subband CSI reporting is a feature that allows for more granular monitoring of channel conditions across smaller frequency ranges within the total available bandwidth. In 5G, the total system bandwidth is divided into smaller subbands or frequency chunks. Subband CSI refers to the configuration and reporting of channel information for each of these subbands. Each subband typically covers a specific frequency range, and CSI sub-configuration defines how the UE should measure and report channel conditions within these subbands. Subband CSI reporting may have or not a periodicity. Subband CSI reporting can be set to occur at different reporting intervals or periodicities. For example, the UE may be configured to provide subband CSI feedback for certain subbands more frequently than others, depending on the network's requirements. The size of each subband, in terms of the number of resource blocks or frequency resources, can vary.
[0035] The CSI sub-configuration may refer, in this or another embodiment, to the specific settings and parameters that determine how the channel state information is measured and reported for subbands within the overall system bandwidth. CSI sub-configuration may specify the size of each subband. CSI feedback for subbands can be reported periodically or based on events. The NE may configure the UE to provide subband CSI updates when significant changes in channel conditions are detected within a particular subband. Subband CSI can influence resource allocation decisions. The NE 220 may use the subband CSI feedback to allocate resources more efficiently, especially when different subbands have varying channel qualities. Thus, the CSI sub-configuration may include, in one embodiment, a list of one or more CSI-RS resources or a CSI-RS antenna port sub-set, and / or a power offset for a physical downlink shared channel (PDSCH) relative to CSI-RS.
[0036] The CSI configuration manager 219 is configured to implement plural CSI configurations, and depending on the existing conditions, selects one CSI configuration from the CSI report scheme and instructs a measurement unit of the UE to measure the information specific for the selected CSI configuration or sub-configuration (s) and instructs the transceiver 213 to supply a modified CSI report to the NE. The various CSI configurations and sub-configurations (and / or CSI report scheme) implemented in the UE and / or the NE according to this embodiment will be discussed later.
[0037] A method 300 for CSI measurement and reporting for NES when the CSI configuration includes plural CSI sub-configurations is now discussed with regard to FIG. 3. UE 210 may optionally report 302, a UE capability indicating the supported CSI report scheme for a CSI report configuration with multiple CSI sub-configurations. Note that a dash line or box in the signal diagram figures indicates an optional step. As discussed above, because the UE might not receive in time the at least one CMR or the at least one CMR and IMR for some of the available CSI sub-configurations, various CSI report configurations may be used to address the possible scenarios. These CSI report configurations are thus part of the CSI report scheme. In other words, the CSI report scheme includes plural CSI report configurations. The UE may support one or more of the CSI report configurations associated with the CSI report scheme.
[0038] The NE transmits 304 a control signaling configuring at least one CSI report configuration, in the UE, with one or more than one CSI sub-configurations, and also configures the at least one CMR or the at least one CMR and IMR in each CSI sub- configuration. Optionally, the control signaling may also configure a CSI report scheme for a CSI report with multiple CSI sub-configurations based on the received CMR or CMR and IMR for a subset of CSI sub-configurations. Note that the subset may include any number of sub-configurations. In one application, the subset is neither a null set nor the full set of sub-configurations.
[0039] The NE may transmit the control signaling by RRC signaling, e.g., RRCReconfiguration or CSI-ReportConfig. In some implementations, for semi-persistent CSI report or aperiodic CSI report, the NE may transmit Medium Access Control (MAC) Control Element (CE) or Downlink Control Information (DCI) activating or triggering the CSI report for a subset of CSI sub-configuration (s) . In this section, unless specified, RRC signaling may indicate a RRC reconfiguration message from the NE to UE, or a System Information Block (SIB) , where the SIB can be an existing SIB (e.g., SIB1) or a new SIB (e.g., SIBJ, where J is an integer above 21) transmitted by the NE. In some implementations, the NE may receive the UE capability from the UE or from a core network entity (e.g., Access and Mobility Management Function, AMF) or another network entity.
[0040] In optional step 306, the NE may transmit a cell DTX indication to configure the active and inactive times of the cell served by the NE. For example, the NE may transmit a DCI, e.g., DCI format 2_9 associated with a configured NES radio network temporary identifier (NES-RNTI) , to configure the cell DTX.
[0041] The NE transmits 308 the at least one CMR for a subset of CSI sub-configurations during the cell DTX active time and may refrain from transmitting another CMR in the cell DTX inactive time. The NE may optionally transmit 310 the at least one IMR so that the UE receives both the CMR and the IMR when both are configured for the subset of CSI sub-configurations. As such, the UE according to various embodiments discussed herein need to receive the CMR for CSI measurements, receiving also the IMR being optional.
[0042] Based on the information received in steps 304 and 308, and optionally on the information received in step 306, the UE determines 312 what CSI information to include in the CSI report, including what modified CSI report to generate. This step may be performed by the CSI configuration manager 219. As discussed later in more detail, the UE may determine to drop the entire CSI report or a part of the CSI report, which results in the transmission of a modified CSI report. The UE may also determine in this step what information to include in the CSI report, i.e., latest measured information, outdated measured information, or a mixture of the two. For example, the UE may drop the CSI (s) corresponding to a first set of CSI sub-configuration (s) without CMR or CMR and IMR, received before the CSI reference resource in the cell DTX active time, and the UE may transmit the CSI (s) corresponding to other CSI sub-configuration (s) , i.e., a second set of CSI sub-configuration (s) . Alternatively, the UE may transmit the latest CSI(s) corresponding to the second set of CSI sub-configuration (s) and outdated CSI (s) corresponding to the first set of CSI sub-configuration (s) . Alternatively, the UE may drop the whole CSI report if no CMR or CMR and IMR information is received for each CSI sub-configuration. Specific combinations of these parameters and / or features are discussed in more detail later.
[0043] The UE generates 314 the modified CSI report (based on the rules noted in step 312) and optionally transmits 316 the modified CSI report to the NE (note that if the UE decides in step 312 to drop the CSI report, then no report is generated in this step) . As discussed above, the modified CSI may drop various parts of the information associated with one or more CSI sub-configurations.
[0044] FIG. 4 is a flow diagram of a CSI measuring and reporting method 400 performed by a UE (such as UE 210) according to an embodiment. The method 400 may include optionally transmitting 402 UE capability indicating the supported CSI report scheme for a CSI report with multiple CSI sub-configurations based on the received at least one CMR or at least one CMR and IMR for one, plural, or each CSI sub-configuration. The UE receives 404 the RRC signaling from the NE, which configures at least one CSI report configuration with one or more CSI sub-configurations, and also configures at least one CMR or at least one CMR and IMR in each sub-configuration. The RRC signaling may also configure a CSI report scheme for a CSI report with multiple CSI sub-configurations based on the received CMR or CMR and IMR for a subset of CSI sub-configurations.
[0045] The UE optionally receives 406 a DCI for cell DTX configuration, i.e., the cell DTX active and inactive times. The UE receives 408 the at least one CMR for one or more CSI sub-configurations and optionally receives 410 the at least one IMR for the one or more CSI sub-configurations. Based on the received information, the UE decides 412 to measure no CSI, or CSI associated with the subset for which the at least one CMR has been received, and to generate the modified CSI report. The modified CSI report may also be influenced by the triggered CSI sub-configurations, i.e., those sub-configurations that are specifically requested by the NE. In this regard, it is possible that the NE triggers CSI for specific CSI sub-configurations, and not for all the CSI sub- configurations. Specific scenarios to illustrate this dependency are later discussed with regard to FIGs. 6 to 10. The UE generates 414 the modified CSI report based on the factors noted above and transmits 416 the modified CSI report. In one embodiment, the UE decides in step 412 that no CSI is transmitted to the NE during a certain cycle and thus, steps 414 and 416 are not performed during that cycle. However, for a next cycle, the UE may determine that the modified CSI report should include a part of the traditional CSI report and thus, for that cycle, steps 414 and 416 are performed. The UE may also decide in step 412, based on the information received from the previous steps, to calculate the CPUs and add this information to the modified CSI report. Details about the step of calculating the CPUs are discussed later.
[0046] FIG. 5 is a flow diagram of receiving a modified CSI report method 500 performed by a NE (such as NE 220) according to an embodiment. Method 500 may include optionally the NE receiving 502 the UE capability noted above with regard to step 402. The NE transmits 504 the RRC signaling discussed with regard to step 404. The NE, which may optionally transmit 506 the cell DTX indication with a DCI, transmits 508 the at least one CMR for at least one CSI sub-configuration. The NE then optionally transmits 510 the at least one IMR for the at least one CSI sub-configuration. The NE determines 516 the dropped portions from the modified CSI report and extracts the CSIs for the subset of CSI sub-configurations for which the UE received the at least one CMR or the at least one CMR and IMR. The NE may use the extracted information for beamforming, spatial configuration for transmitting and receiving data when using MIMO, massive MIMO, resource allocation, interference management, network optimization, handover and mobility management, adaptive modulation and coding, resource-efficient communication, quality of service assurance, and more.
[0047] For enabling the UE to determine a modified CSI report upon receiving at least one CMR or at least one CMR and IMR for a subset of CSI sub-configurations, the NE may configure a list of CSI-RS resource index for channel measurement (CMR list) and a list of CSI-RS resource index and / or CSI-IM index for interference measurement (IMR list) in each CSI sub-configuration. The CSI-RS resource index is a parameter that identifies a specific CSI-RS resource within a given resource set. In 5G NR, CSI-RS resources are organized into sets. Each resource set contains a group of CSI-RS resources, and each resource in the set is identified by its resource index. The CSI-RS resource index is a numeric value that uniquely identifies a specific CSI-RS resource within its resource set. The UE uses the CSI-RS resource index to identify which CSI-RS resource to measure. The CMR list and IMR list are associated in a one-to-one relation.
[0048] In some other implementations, the NE may configure a CMR list in each CSI sub-configuration and an IMR list in CSI report configuration. The IMR in the IMR list and CMR across all the CMR lists are one-to-one associated. The NE and UE may determine the association for the CMR based on the CSI sub-configuration index and the CMR index in each list in the CSI sub-configuration. In one example, if the IMR contains IMR {1, 2, 3, 4} , the CMR list in the CSI sub-configuration 1 contains CMR {1, 2} , and the CMR list in the CSI sub-configuration 2 contains CMR {3, 4} , the NE and UE may determine the IMR x is associated with CMR x, where x is 1, 2, 3 or 4 in this example.
[0049] In some other implementations, the NE configures a CMR list and an IMR list in a CSI report configuration and configures the CMR list in each CSI sub-configuration from the CMR list in the CSI report configuration. The CMR list and IMR list in the CSI report configuration are in one-to-one relationship. In yet other implementations, the UE receives the associated CMR and IMR based on the same spatial receiving filter. Thus, the UE determines the CMR and its associated IMR based on the same quasi-co-location (QCL) property with spatial receiving parameter.
[0050] In some implementations, the NE configures a first power offset, e.g., powerOffset, indicating the energy per resource element (EPRE) ratio between the PDSCH and CSI-RS for the CSI-RS resource (s) configured as CMR (s) for a CSI sub-configuration and configures a second power offset, e.g., powerControlOffset, indicating the EPRE ratio between PDSCH and CSI-RS for each CSI-RS resource configured as CMR. The NE configures a third power offset, e.g., powerOffset, indicating the EPRE ratio between the PDSCH and CSI-RS for the CSI-RS resource (s) configured as IMR (s) for a CSI sub-configuration and configures a fourth power offset, e.g., powerControlOffset, indicating the EPRE ratio between PDSCH and CSI-RS for each CSI-RS resource configured as IMR. The UE calculates the interference based on the third and fourth power offset for the IMR.
[0051] In some other implementations, the NE configures a first power offset, e.g., powerOffset, indicating the EPRE ratio between the PDSCH and CSI-RS for the CSI-RS resource (s) configured as CMR (s) and the CSI-RS resource (s) configured as IMR (s) for a CSI sub-configuration, a second power offset, e.g., powerControlOffset, indicating the EPRE ratio between PDSCH and CSI-RS for each CSI-RS resource configured as CMR, a fourth power offset, e.g., powerControlOffset, indicating the EPRE ratio between PDSCH and CSI-RS for each CSI-RS resource configured as IMR. The UE calculates the interference based on the first and fourth power offset for the IMR.
[0052] In some other implementations, the NE configures a first power offset, e.g., powerOffset, indicating the EPRE ratio between the PDSCH and CSI-RS for the CSI-RS resource (s) configured as CMR (s) for a CSI sub-configuration, a second power offset, e.g., powerControlOffset, indicating the EPRE ratio between PDSCH and CSI-RS for each CSI-RS resource configured as CMR, a fourth power offset, e.g., powerControlOffset, indicating the EPRE ratio between PDSCH and CSI-RS for each CSI-RS resource configured as IMR. The UE calculates the interference based on the fourth power offset for the IMR.
[0053] The various scenarios addressed by the CSI report scheme are now discussed with regard to FIGs. 6 to 10. In a first scenario, the UE decides to omit the entire CSI report 600, which is illustrated in FIG. 6, or to omit a part of the CSI report, associated with a first subset of CSI sub-configurations (for which the UE received no CMR or CMR and IMR) , and to send a modified CSI report 700 that includes the CSI only for the triggered CSI sub-configurations 602 from a second set (for which the UE received the CMR or CMR and IMR) , as illustrated in FIG. 7. A triggered CSI sub-configuration 602 is a configuration for which the NE specifically requests the UE to provide the corresponding CSI. More specifically, FIG. 6 shows, on a time axis, the NE sending CMR1 and IMR1 604 for sub-configuration 1 and CMR2 and IMR2 606 for sub-configuration 2, before a CSI reference slot (or CSI reference resource) 608 is sent to the UE. Because the transmission of CMR1 and IMR1 occurs during the inactive time of the DRX, the UE does not receive these resources for sub-configuration 1. Note that the same scenario works if only the CMR is received for sub-configuration 2. FIG. 6 also shows the NE triggering a CSI report for only the sub-configuration 2. Because the CMR1 and IMR1 are not received during the active time of the DRX (note that the CMR1 and IMR1 may not be received by the UE due to other reasons) , the UE decides to drop the entire CSI report, although the CSI report for sub-configuration 2 has been triggered by the NE and can be measured. In other words, according to this scenario, the UE decides to omit the entire CSI report when UE does not receive, for each sub-configuration, the corresponding CMR or CMR and IMR before the CSI reference slot.
[0054] Thus, after the CSI report (re) configuration, serving cell activation, BWP change, or activation of SP-CSI, the UE reports a CSI report only after receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for all the configured CSI sub-configurations no later than CSI reference resource and drops the report otherwise. If DRX is configured, the UE reports a CSI report only if receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for all the configured CSI sub-configurations in DRX Active Time no later than CSI reference resource and drops the report otherwise. If cell DTX is configured, the UE reports a CSI report only if receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for all the configured CSI sub-configurations in cell DTX Active Time no later than CSI reference resource and drops the report otherwise.
[0055] In an alternative CSI report configuration, as illustrated in FIG. 7, if the UE receives the CMR or the CMR and IMR only for sub-configuration 2, but not for sub- configuration 1, and the NE triggered a CSI report for the sub-configuration 2, the UE decides to omit CSI for the first sub-configuration (or first subset of sub-configurations) and to provide a modified CSI report 700 that includes the CSI only for the triggered sub-configurations (of a second subset of sub-configurations for which the CMR or CMR and IMR have been received) . In this and the following examples, the UE does not receive the CMR or CMR and IMR for the first subset (e.g., sub-configuration 1) before the CSI reference slot (for any reason) , and the UE receives the CMR or CMR and IMR for the second subset (e.g., sub-configuration 2) . Thus, the modified CSI report 700 for the scenario of FIG. 7 includes only information associated with the triggered CSI sub-configurations from the second subset (e.g., CSI report including CSI for sub-configuration 2) .
[0056] In one embodiment, each of the above two examples may be implemented after a given network event, for example, the CSI report (re) configuration, serving cell activation, BWP change, or activation of SP-CSI. In another embodiment, the two examples may take place when the cell DTX is implemented instead of the DRX. Note that FIGs. 6 to 10 show the various scenarios for the DRX implementation, but the failure to receive the CMR or the CMR and IMR for one or more sub-configurations before the CSI reference slot (CSI reference resource) can happen because of the cell DTX, or the given network event noted above, or for other reasons.
[0057] Thus, after the CSI report (re) configuration, serving cell activation, BWP change, or activation of SP-CSI, the UE reports a CSI report only after receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for all the triggered CSI sub-configurations no later than CSI reference resource and drops the report otherwise. If DRX is configured, the UE reports a CSI report only if receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for all the triggered CSI sub-configurations in DRX Active Time no later than CSI reference resource and drops the report otherwise. If cell DTX is configured, the UE reports a CSI report only if receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for all the triggered CSI sub-configurations in cell DTX Active Time no later than CSI reference resource and drops the report otherwise.
[0058] In another scenario, which is illustrated in FIG. 8, the UE receives the CMR or the CMR and IMR only for sub-configuration 2 (which belongs to second subset of CSI sub-configurations) , but not for sub-configuration 1 (which belongs to the first subset of CSI sub-configurations) , and the NE triggered a CSI report for both sub-configuration 1 and sub-configuration 2. Based on this set of conditions, the UE decides to omit CSI for the first subset of sub-configurations and to provide a modified CSI report 800 that includes the CSI only for the sub-configurations of the second subset. In on embodiment, the modified CSI report 800 may include CSI for configured sub-configuration (s) , even if not triggered 602 by the NE, after UE receives a CMR or CMR and IMR for such configured sub-configuration (s) before the CSI reference resource.
[0059] The same rule may be implemented after the given network event discussed above, i.e., the CSI report (re) configuration, serving cell activation, BWP change, or activation of SP-CSI. In another embodiment, this rule may take place when the cell DTX is implemented instead of the DRX. Note that FIG. 8 shows that the cell DTX is configured. However, one skilled in the art would understand that the same scenario can happen under different conditions, as long as the UE does not receive the CMR or the CMR and IMR for the first subset of sub-configurations but receives the CMR or the CMR and IMR for the second subset of sub-configurations, before the CSI reference resource.
[0060] Thus, after the CSI report (re) configuration, serving cell activation, BWP change, or activation of SP-CSI, the UE reports the CSI for a triggered or configured CSI sub-configuration only after receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for the CSI sub-configuration no later than CSI reference resource and drops the CSI otherwise. If DRX is configured, the UE reports the CSI for a triggered or configured CSI sub-configuration only if receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for the CSI sub-configuration in DRX Active Time no later than CSI reference resource and drops the CSI otherwise. If cell DTX is configured, the UE reports the CSI for a triggered or configured CSI sub-configuration only if receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for the CSI sub-configuration in cell DTX Active Time no later than CSI reference resource and drops the report otherwise.
[0061] In yet another scenario, which is illustrated in FIG. 9, the UE receives the CMR or the CMR and IMR only for sub-configuration 2, but not for sub-configuration 1, and the NE triggered a CSI report for both sub-configuration 1 and sub-configuration 2. For this set of conditions, the UE decides to send a modified CSI report 900 that includes outdated CSIs for the first sub-configuration (e.g., the first subset if more sub- configurations are in this situation) and the latest CSIs for the second sub-configuration (e.g., the second subset if more sub-configurations are in this situation) . The latest CSIs refers to information measured by the UE after receiving the CMR or CMR and IMR for the second set of sub-configurations while the outdated CSIs refers to information that was measured prior to receiving the CMR or CMR and IMR. The same rule may be implemented after the given network event discussed above. In another embodiment, this rule may take place when the cell DTX is implemented instead of the DRX.
[0062] Thus, after the CSI report (re) configuration, serving cell activation, BWP change, or activation of SP-CSI, the UE reports the measured CSI for a triggered or configured CSI sub-configuration only after receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for the CSI sub-configuration no later than CSI reference resource and reports the outdated CSI otherwise. If DRX is configured, the UE reports the measured CSI for a triggered or configured CSI sub-configuration only if receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for the CSI sub-configuration in DRX Active Time no later than CSI reference resource and reports the outdated CSI otherwise. If cell DTX is configured, the UE reports the measured CSI for a triggered or configured CSI sub-configuration only if receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for the CSI sub-configuration in cell DTX Active Time no later than CSI reference resource and reports the outdated CSI otherwise.
[0063] In still another scenario, which is illustrated in FIG. 10, the UE receives the CMR or the CMR and IMR only for sub-configuration 2, but not for sub-configuration 1, and the NE triggered a CSI report for both sub-configuration 1 and sub-configuration 2. For this set of conditions, the UE decides to send a modified CSI report 1000 that includes outdated CSIs for both the first subset (e.g., sub-configuration 1) and the second subset (e.g., sub-configuration 2) of sub-configurations. The same rule may be implemented after the given network event discussed above. In another embodiment, this rule may take place when the cell DTX is implemented instead of the DRX.
[0064] Thus, after the CSI report (re) configuration, serving cell activation, BWP change, or activation of SP-CSI, the UE reports a CSI report only after receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for all the triggered or configured CSI sub-configurations no later than CSI reference resource and reports the outdated CSI for the CSI report otherwise. If DRX is configured, the UE reports a CSI report only if receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for all the triggered or configured CSI sub-configurations in DRX Active Time no later than CSI reference resource and reports the outdated CSI for the CSI report otherwise. If cell DTX is configured, the UE reports a CSI report only if receiving at least one CSI-RS transmission occasion for channel measurement and CSI-RS and / or CSI-IM occasion for interference measurement for all the triggered or configured CSI sub-configurations in cell DTX Active Time no later than CSI reference resource and reports the outdated CSI for the CSI report otherwise.
[0065] In another embodiment, the NE configures a granularity of CSI dropping, e.g., whether to drop the CSI in a CSI report configuration level or in a CSI sub-configuration level. In other words, the NE dynamically selects the modified CSI report 600 to 1000 based on one of the scenarios discussed above with regard to FIGs. 6 to 10. The NE may transmit the configuration by RRC signaling, MAC CE or DCI. In one example, the NE may transmit the configuration by RRC reconfiguration or CSI report configuration. In another example, the NE may transmit the configuration by the MAC CE activating the semi-persistent CSI report. In another example, the NE may transmit the configuration by the DCI triggering the aperiodic CSI report. In some implementations, the UE may report the UE capability indicating the supported CSI dropping granularity, e.g., whether to drop the CSI in a CSI report configuration level or in a CSI sub-configuration level.
[0066] In an embodiment, the UE may configure whether to transmit the outdated CSI or omit the CSI for the CSI report or the CSI sub-configuration. In some implementations, the UE may report the UE capability indicating whether it supports transmitting the outdated CSI or drop the CSI for the CSI report or the CSI sub-configuration.
[0067] In the above discussed embodiments, the influence of the plural CSI sub-configurations and associated CMR or CMR and IMR, on the CSI report was discussed. The CPUs (CSI processing units) in UE are responsible for CSI measurements, CSI reporting, CSI feedback, and CSI processing, among other things. The available CSI processing units are currently calculated as discussed in the Background section. However, the current method for such calculations does not consider the presence of plural CSI sub-configurations, and / or the fact that only a subset of these sub- configurations may receive a CMR or CMR and IMR. Thus, the next embodiments discuss methods for determining the number of CPUs in the UE when plural CSI sub-configurations are available and only a subset of these sub-configurations are receiving CMR or CMR and IMR before a CSI reference slot.
[0068] In an embodiment, the UE may determine the number of CPUs for a CSI report configuration with multiple CSI sub-configurations based on the number X of CSI sub-configuration (s) with CMR or CMR and IMR received and the number of CMR resources for the CSI sub-configuration (s) . For example, the UE may determine the number of CPUs as being given by where Ms indicates the number of triggered CSI-RS resources for channel measurement for CSI sub-configuration s within the CSI sub-configuration (s) with measured CSI reported. In other words, the number of CPUs is calculated in this embodiment based on the number of triggered CSI sub-configuration (s) with received CMR or CMR and IMR.
[0069] In another embodiment, the UE may determine the number of CPUs for a CSI report configuration with multiple CSI sub-configurations based on the number Q of triggered CSI sub-configuration (s) and the number of CMR resources for the CSI sub-configuration (s) . For example, the UE may determine the number of CPUs as where Ms indicates the number of CSI-RS resources for channel measurement for CSI sub-configuration s within the triggered CSI sub-configuration (s) . In other words, the number of CPUs is calculated based on the number of triggered CSI sub-configurations.
[0070] In yet another embodiment, the UE may determine the number of CPUs for a CSI report configuration with multiple CSI sub-configurations based on the number Q of CSI sub-configuration (s) with the measured and / or outdated CSI reported, whether the UE reports outdated CSI for the CSI sub-configuration or not, and the number of CMR resources for the CSI sub-configuration (s) . In one example, the UE may determine the number of CPUs as being where Ms indicates the number of CSI-RS resources for channel measurement for CSI sub-configuration s within the triggered CSI sub-configuration (s) , and βs is determined based on whether the UE reports a latest measured CSI or outdated CSI for the CSI sub-configuration s. In some implementations, βs may be pre-defined, e.g., if the UE reports a latest measured CSI for the CSI sub-configuration s, βs=1, otherwise, βs=0.5. In some other implementations, βs may be reported by the UE or configured by the network entity.
[0071] In still another embodiment, the UE may report its ability of determining the number of CPUs based on one of the above discussed possibilities, i.e., the number of triggered CSI sub-configurations (the second option above discussed) or number of CSI sub-configurations with CMR or CMR and IMR received (the first option) or the number of triggered CSI sub-configurations and whether the UE reports a latest measured CSI or outdated CSI for the CSI sub-configuration (the third option) . The CPU reporting may be combined or not with the CSI reporting.
[0072] The concepts presented in this disclosure have wide-ranging applicability across a diverse spectrum of telecommunication systems, network architectures, and communication standards. For instance, consider the 3GPP, a standards organization responsible for defining numerous wireless communication standards, particularly those related to the evolved packet system (EPS) commonly known as long-term evolution (LTE) networks. Evolved iterations of LTE, like fifth-generation (5G) networks, can support a plethora of services and applications, including but not limited to web browsing, video streaming, Voice over Internet Protocol (VoIP) , mission-critical applications, multi-hop networks, real-time remote operations (e.g., tele-surgery) , and more.
[0073] Hence, the teachings presented here can be implemented across various network technologies, including, but not restricted to, 6G, 5G, fourth-generation (4G) , third-generation (3G) , and diverse network architectures. Moreover, the techniques described herein can be applied to different types of links, whether it's a downlink, uplink, peer-to-peer link, or any other connection type.
[0074] The selection of the specific telecommunication standard, network architecture, or communication standard hinges on the particular application and the overall system design constraints imposed. While these disclosures may illustrate certain aspects in the context of a 6G, 5G or LTE system for clarity, one skilled in the art would recognize that these teachings are equally adaptable to other technological frameworks, networks, components, signaling methods, and so forth.
[0075] In summary, the adaptability and versatility of the concepts discussed in this disclosure make them suitable for a wide array of telecommunication scenarios, regardless of the specific terminology or technology involved.
[0076] Numerical adjectives “first” , “second” , and “third” used in the above embodiments do not imply any order (are not ordinals) but are markers to distinguish separate instances of similar elements. References to the singular (e.g., “a” or “an” , “the” ) should include the plural unless clearly indicated otherwise.
[0077] Although the features and elements of the present embodiments are described in the embodiments in particular combinations, each feature or element can be used alone without the other features and elements of the embodiments or in various combinations with or without other features and elements disclosed herein. The methods or flowcharts may be implemented in a computer program, software or firmware tangibly embodied in a computer-readable storage medium for execution by a specifically programmed computer or processor.
Claims
1.A wireless communication method (400) for reporting channel state information, CSI, performed by a user equipment, UE, (110) the method comprising:receiving (404) , from a network entity, NE, (120) , a CSI report configuration including plural CSI sub-configurations, each of the plural CSI sub-configurations being associated with at least one channel measurement resource, CMR;receiving (408) one or more CMRs for a subset of the CSI sub-configurations, before receiving a CSI reference resource; andselectively transmitting (416) , based on the one or more CMRs and a triggered CSI sub-configuration, a CSI report to the NE (120) .2.The method of Claim 1, wherein each of the plural CSI sub-configurations is further associated with at least one interference measurement resource, IMR, wherein the receiving includes receiving the one or more CMRs and one or more IMRs for the subset of CSI sub-configurations, before receiving the CSI reference resource, and wherein the selectively transmitting is further based on the received one or more IMRs.3.The method of any of Claims 1 or 2, wherein the selectively transmitting includes refraining from transmitting the CSI report unless the UE receives the one or more CMRs or the one or more CMRs and IMRs for each CSI sub-configuration of the CSI configuration.4.The method of any of Claims 1 or 2, wherein the selectively transmitting includes transmitting a modified CSI report when the UE receives the one or more CMRs or the one or more CMRs and IMRs for the triggered CSI sub-configuration of the CSI configuration, and the modified CSI report includes information associated with the triggered CSI sub-configuration.5.The method of any of Claims 1 or 2, wherein the selectively transmitting includes transmitting a modified CSI report when the UE receives the one or more CMRs or the one or more CMRs and IMRs for the subset of CSI sub-configurations of the CSI configuration, and the modified CSI report includes information associated only with the subset of the CSI sub-configurations.6.The method of any of Claims 1 or 2, wherein the selectively transmitting includes transmitting a modified CSI report when the UE receives the one or more CMRs or the one or more CMRs and IMRs for each CSI sub-configuration of the subset of CSI sub-configurations, and the modified CSI report includes latest measured information associated with the subset of the CSI sub-configurations and outdated information associated with the remaining CSI sub-configurations.7.The method of any of Claims 1 or 2, wherein the selectively transmitting includes transmitting a modified CSI report when the UE receives the one or more CMRs or the one or more CMRs and IMRs for a CSI sub-configuration of the subset of CSI sub-configurations, and the modified CSI report includes outdated information associated with the subset of the CSI sub-configurations and outdated information associated with the remaining CSI sub-configurations.8.The method of any of Claims 1 or 2, wherein the selectively transmitting includes transmitting a CSI report having a variable granularity such that the CSI report includes no CSI information, CSI information associated with only the subset of CSI sub-configurations, or CSI information associated with only triggered CSI sub-configurations, and wherein the CSI information is one or more of latest measured information and outdated measured information.9.The method of any of Claims 1 to 8, wherein the one or more CMRs are received during an active time of at least one of: a cell discontinuous transmission, DTX, or a UE discontinuous reception, DRX.10.The method of any of Claims 1 to 9, further comprising:determining a number of CSI processing units based on at least one of:a number of triggered CSI sub-configurations with the one or more CMR received before the CSI reference resource,a number of triggered CSI sub-configurations, ora weighted sum of triggered CSI sub-configurations, wherein weights are related to a latest measured CSI or an outdated measured CSI associated with the triggered CSI sub-configurations.11.The method of any of Claims 2 to 10, wherein a list of CSI reference signal, CSI-RS, resource index for the one or more CMRs is mapped one-to-one to a list of CSI-RS resource index for the one or more IMRs.12.The method of any of Claims 1 to 11, further comprising:reporting to the NE a UE capability indicating a supported CSI report scheme for the CSI report based on reception of the one or more CMRs for the subset of the CSI sub-configurations.13.The method of any of Claims 1 to 12, further comprising:defining plural power offsets, one power offset being related to an energy per resource element, EPRE, ratio between a downlink communication channel, PDSCH, and a channel state information resource signal, CSI-RS, for interference measurement; andcalculating downlink communication channel interference based on the one power offset for the interference measurement.14.A wireless communication method (500) for receiving channel state information, CSI, performed by a network entity, NE, (120) the method comprising:transmitting (504) to a user equipment, UE, (110) a CSI report configuration including plural CSI sub-configurations, each CSI sub-configuration being associated with at least one channel measurement resource, CMR, or at least one channel measurement resource, CMR and at least one interference measurement resource, IMRs;transmitting (508) one or more CMRs or one or more CMRs and IMRs for a subset of the CSI sub-configurations, before transmitting a CSI reference resource; andreceiving (516) a CSI report from the UE (110) , including information determined based on UE-received one or more CMRs or one or more CMRs and IMRs, and a triggered CSI sub-configuration.15.The method of Claim 14, wherein the one or more CMRs or the one or more CMRs and IMRs are transmitted during an active time of at least one of: a cell discontinuous transmission, DTX, or a UE discontinuous reception, DRX.16.A wireless communication device (210, 220) comprising a transceiver (213, 222) , a processor (216, 223) , and computer-readable storage media (217, 224) storing executable instructions for the processor to perform any one of methods recited in claims 1-14, using the transceiver.