Methods and apparatus for channel state information measurement in mobile communications
By using DCI to indicate CMR and IMR based on a reference signal resource set, the limitations of legacy NR CSI measurements are overcome, allowing for more adaptable and efficient CSI measurement in mobile communications.
Patent Information
- Application Number
- PCT/CN2025/072907
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-01-17
- Filing Date
- 2025-01-17
- Publication Date
- 2025-07-24
AI Technical Summary
Legacy NR CSI measurements in mobile communications are limited by the exclusive use of un-precoded CSI-RSs, making them less adaptable to complex propagation conditions, necessitating more flexible network configurations to enhance performance.
Implementing a method where a network node transmits downlink control information (DCI) to indicate channel and interference measurement resources (CMR and IMR) based on a reference signal resource set, which can include CSI-RS, DMRS, and PDSCH resource sets, allowing for more flexible CSI measurement.
This approach enhances the adaptability of CSI measurement, enabling dynamic adjustments to various network scenarios and improving data throughput and spectral efficiency.
Smart Images

Figure CN2025072907_24072025_PF_FP_ABST
Abstract
Description
METHODS AND APPARATUS FOR CHANNEL STATE INFORMATION MEASUREMENT IN MOBILE COMMUNICATIONSCROSS REFERENCE TO RELATED PATENT APPLICATION (S)
[0001] The present disclosure is part of a non-provisional application claiming the priority benefit of India Application No. 202421003398, filed 17 January 2024, the content of which herein being incorporated by reference in its entirety.TECHNICAL FIELD
[0002] The present disclosure is generally related to mobile communications and, more particularly, to channel state information measurement with respect to apparatus in mobile communications.BACKGROUND
[0003] Unless otherwise indicated herein, approaches described in this section are not prior art to the claims listed below and are not admitted as prior art by inclusion in this section.
[0004] In New Radio (NR) mobile communications, channel state information (CSI) measurement is a critical feature designed to support adaptive resource allocation between a network node (e.g., a base station) and a user equipment (UE) . The CSI measurement may involve the network node transmitting a CSI-reference signal (CSI-RS) to the UE, allowing the UE to assess the quality of the communication channel. By performing these measurements, the UE may generate CSI feedback (e.g., CSI report) , which typically includes metrics such as the channel quality indicator (CQI) , precoding matrix indicator (PMI) and / or rank indicator (RI) . The CSI feedback may then be transmitted back to the network node, enabling the network node to dynamically adjust transmission parameters to enhance performance. These parameters may include modulation schemes, coding rates, and spatial multiplexing techniques, which are tailored to current channel conditions to optimize data throughput, minimize interference and improve spectral efficiency.
[0005] However, a limitation of legacy NR CSI measurements is the exclusive use of un-precoded CSI-RSs for channel assessment, making the approach less adaptable to various network scenarios. In scenarios with complex propagation conditions, more flexible network configurations may be necessary to improve the network system's ability to adapt and maximize performance under different network demands.
[0006] Accordingly, how to provide greater flexibility for CSI measurement becomes an important issue in the newly developed wireless communication network. Therefore, there is a need to provide proper schemes to provide greater flexibility for CSI measurement.SUMMARY
[0007] The following summary is illustrative only and is not intended to be limiting in any way. That is, the following summary is provided to introduce concepts, highlights, benefits and advantages of the novel and non-obvious techniques described herein. Select implementations are further described below in the detailed description. Thus, the following summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.
[0008] An objective of the present disclosure is to propose solutions or schemes that address the aforementioned issues pertaining to channel state information (CSI) measurement with respect to apparatus in mobile communications.
[0009] In one aspect, a method may involve an apparatus receiving a downlink control information (DCI) . The DCI may indicate at least one of a channel measurement resource (CMR) and an interference measurement resource (IMR) based on a reference signal (RS) resource set. The RS resource set may include at least one of a CSI-RS resource set, a demodulation reference signal (DMRS) resource set and a physical downlink shared channel (PDSCH) resource set. The method may further involve the apparatus measuring the CMR and the IMR to determine a CSI report. The method may further involve the apparatus transmitting the CSI report.
[0010] In one aspect, a method may involve an apparatus transmitting a DCI for measuring a CMR and an IMR to determine a CSI report. The DCI may indicate at least one of the CMR and the IMR based on a RS resource set. The RS resource set may include at least one of CSI-RS resource set, DMRS resource set and PDSCH resource set. The method may further involve the apparatus receiving the CSI report.
[0011] In one aspect, an apparatus may comprise a transceiver which, during operation, wirelessly communicates with a wireless network. The apparatus may also comprise a processor communicatively coupled to the transceiver. The processor, during operation, may perform operations comprising receiving, via the transceiver, a DCI. The DCI may indicate at least one of a CMR and an IMR based on a RS resource set. The RS resource set may include at least one of CSI-RS resource set, DMRS resource set and PDSCH resource set. The processor may further perform operations comprising measuring the CMR and the IMR to determine a CSI report. The processor may further perform operations comprising transmitting, via the transceiver, the CSI report.
[0012] It is noteworthy that, although description provided herein may be in the context of certain radio access technologies, networks and network topologies such as Long-Term Evolution (LTE) , LTE-Advanced, LTE-Advanced Pro, 5th Generation (5G) , New Radio (NR) , Internet-of-Things (IoT) and Narrow Band Internet of Things (NB-IoT) , Industrial Internet of Things (IIoT) , and 6th Generation (6G) , the proposed concepts, schemes and any variation (s) / derivative (s) thereof may be implemented in, for and by other types of radio access technologies, networks and network topologies. Thus, the scope of the present disclosure is not limited to the examples described herein.BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of the present disclosure. The drawings illustrate implementations of the disclosure and, together with the description, serve to explain the principles of the disclosure. It is appreciable that the drawings are not necessarily in scale as some components may be shown to be out of proportion than the size in actual implementation in order to clearly illustrate the concept of the present disclosure.
[0014] FIG. 1 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0015] FIG. 2 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0016] FIG. 3 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0017] FIG. 4 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0018] FIG. 5 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0019] FIG. 6 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0020] FIG. 7 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0021] FIG. 8 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0022] FIG. 9 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0023] FIG. 10 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0024] FIG. 11 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0025] FIG. 12 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0026] FIG. 13 is a block diagram of an example communication system in accordance with an implementation of the present disclosure.
[0027] FIG. 14 is a flowchart of an example process in accordance with an implementation of the present disclosure.
[0028] FIG. 15 is a flowchart of an example process in accordance with an implementation of the present disclosure. DETAILED DESCRIPTION OF PREFERRED IMPLEMENTATIONS
[0029] Detailed embodiments and implementations of the claimed subject matters are disclosed herein. However, it shall be understood that the disclosed embodiments and implementations are merely illustrative of the claimed subject matters which may be embodied in various forms. The present disclosure may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments and implementations set forth herein. Rather, these exemplary embodiments and implementations are provided so that description of the present disclosure is thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art. In the description below, details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the presented embodiments and implementations. Overview
[0030] Implementations in accordance with the present disclosure relate to various techniques, methods, schemes and / or solutions pertaining to channel state information (CSI) measurement with respect to apparatus in mobile communications. According to the present disclosure, a number of possible solutions may be implemented separately or jointly. That is, although these possible solutions may be described below separately, two or more of these possible solutions may be implemented in one combination or another.
[0031] Regarding the present disclosure, a network node may transmit a downlink control information (DCI) to a user equipment (UE) . The DCI may indicate at least one of a channel measurement resource (CMR) and an interference measurement resource (IMR) based on a reference signal (RS) resource set. The RS resource set may include resource (s) used for RS. The RS resource set may include at least one of a CSI-RS resource set, a demodulation reference signal (DMRS) resource set and a physical downlink shared channel (PDSCH) resource set. After receiving the DCI, the UE may measure the CMR and the IMR to determine a CSI report. Then, the UE may transmit the CSI report to the network node.
[0032] Accordingly, because the CMR and the IMR may be indicated based on the RS resource set, which includes the RS resource (s) (i.e., the CMR and the IMR may include the RS resource (s) ) , and the types of the RS resources may include precoded RS resources or un-precoded RS resources, the CSI measurement corresponding to the precoded RS resources may be more flexible than the CSI measurement corresponding to the un-precoded RS resources.
[0033] FIG. 1 illustrates an example scenario 100 under schemes in accordance with implementations of the present disclosure. Scenario 100 involves at least one network node and a UE, which may be a part of a wireless communication network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Scenario 100 illustrates the current network framework. The UE may connect to the network side. The network side may comprise one or more than one network node.
[0034] In some embodiments, the network node may transmit a DCI to the UE. The DCI may include a CSI report request indicating at least one of a CMR and an IMR based on an RS resource set. In particular, the network node may configure the RS resource set for the UE by a higher layer signaling (e.g., radio resource control (RRC) or MAC-CE) . The higher layer signaling may further indicate that the RS resource set may be used for CMR and / or IMR of a CSI report configuration. The RS resource set may include at least one of a CSI-RS resource set, a demodulation reference signal (DMRS) resource set and a physical downlink shared channel (PDSCH) resource set.
[0035] For example, as shown in FIG. 2 illustrating an example scenario 200 under schemes in accordance with implementations of the present disclosure, the RS resource set is configured in an RRC configuration transmitted from the network to the UE. The RRC configuration indicates that the RS resource set is used for CMR and / or IMR of the CSI report configuration CSI-ReportConfig. In some cases, the RS resource set associated with the CMR may include one of the DMRS resource set and PDSCH resource set.
[0036] Further, the RS resource set may include RS resource (s) . In other words, the RS resource set may include resource (s) or port (s) used for RS transmission (s) . The RS resource set may be shared with multiple UEs (e.g., multi-user multiple-input multiple-output (MU-MIMO)) or multiple transmission-reception points (TRPs) for RS transmission (s) .
[0037] In some implementations, the DCI may include at least one field to indicate at least one of a time-domain resource, a frequency-domain resource and a port information of the at least one of the CMR and the IMR based on the RS resource set. More specifically, the time-domain resource, the frequency-domain resource and the port information may be associated with one of channel state information reference signal (CSI-RS) resource, demodulation reference signal (DMRS) resource and physical downlink shared channel (PDSCH) resource. The DCI may include the at least one field to indicate at least one of CSI resource (s) , DMRS port (s) and PDSCH resource (s) for the at least one of the CMR and the IMR based on the RS resource set while the RS resource set may include at least one of a CSI-RS resource set, a DMRS resource set (i.e., DMRS port set) and a PDSCH resource set.
[0038] In some cases, the time-domain resource or the frequency-domain resource of the at least one of the CMR and the IMR may be associated with a time-domain resource and a frequency-domain resource of a PDSCH scheduled by the DCI. In some cases, the at least one field includes at least one index (e.g., codepoint) associated with table (e.g., codepoint table) of the time-domain resource, the frequency-domain resource and the port information of the CMR and / or the IMR. In some cases, the time-domain resource, the frequency-domain resource and the port information may be indicated by different fields of the DCI corresponding to the CMR and the IMR.
[0039] In some implementations, in an event that the RS resource set includes the DMRS resource set. The RS resource (s) in the DMRS resource set may include DMRS port (s) used for DMRS transmission (s) . For example, as shown in FIG. 3 illustrating an example scenario 300 under schemes in accordance with implementations of the present disclosure, the DMRS resource set includes DMRS ports {1000 to 1011} . In this example, DMRS port {1006} is used for UE#1 (i.e., the UE) , DMRS ports {1007, 1008} are used for UE#2, DMRS port {1009} is used for UE#3, DMRS port {1010} is used for UE#4, and DMRS port {1011} is used for UE#5.
[0040] In some implementations, in an event that the RS resource set includes the CSI-RS resource set. The RS resource (s) in the CSI-RS resource set may include CSI-RS resource (s) used for CSI-RS transmission (s) . For example, as shown in FIG. 4 illustrating an example scenario 1300 under schemes in accordance with implementations of the present disclosure, the CSI-RS resource set includes non-zero power (NZP) CSI-RS resources {3000 to 3007} . In this example, CSI-RS resources {3000, 3001} are used for UE#1 (i.e., the UE) , CSI-RS resource {3002} is used for UE#2, CSI-RS resource {3003} is used for UE#3, CSI-RS resources {3004, 3005} are used for UE#4, and CSI-RS resources {3006, 3007} are used for UE#5.
[0041] In some implementations, in an event that the RS resource set includes the PDSCH resource set. The RS resource (s) in the PDSCH resource set may include PDSCH resource (s) used for PDSCH transmission (s) .
[0042] In some implementations, to dynamically trigger the UE to perform a CSI measurement and / or CSI report for different channel state hypotheses (i.e., different combinations of CMR and IMR) according to different network scenarios, a table associated with resource (s) for CMR and IMR may be configured by the RRC transmitted from the network node to the UE. In particular, the table may include a plurality of items associated with resource (s) for CMR and IMR. In other words, the table may include candidates of CMR and IMR. The network node may transmit the DCI to indicate which item (s) of the table the UE may use for CMR and / or IMR.
[0043] More specifically, each item of the table may be associated with at least one resource (or port) of the RS resource (s) in the RS resource set. The DCI may include a field indicating a specific item of the table for a CSI measurement and / or CSI report. The resource (s) associated with the specific item may be indicated as CMR and / or IMR for the CSI measurement and / or CSI report. In some cases, the CSI measurement and / or CSI report may be triggered by the same DCI.
[0044] Regarding IMR, the network node may trigger the CSI report for different UE pairing combinations by the DCI indicating at least one item (i.e., at least one resource of the RS resource) of the table for interference measurement. For example, in an event that the network node needs the UE to report the CSI report associated with interferences from UE#2 and UE#3, the network node transmits the DCI to the UE, and the DCI indicates items (i.e., resources of the RS resource) of the table while these items are used for UE#2 and UE#3.
[0045] In some cases, one channel state hypothesis (i.e., one combination of CMR and IMR) may be a candidate of CMR and IMR in which at least one CMR may be paired with at least one IMR. In some cases, the DCI may include at least one field including at least one index (e.g., codepoint) associated with the table (e.g., codepoint table) of the candidates of CMR and IMR, and the at least one index may indicate the at least one of the CMR and the IMR. In some cases, each item of the table of the candidates of CMR and IMR candidates may include DMRS port groups or DMRS code division multiplexing (CDM) groups. In some cases, the table may be activated by MAC-CE. In some cases, the table may be used for single user multiple-input multiple-output (SU-MIMO) , MU-MIMO, non-coherent joint transmission (NCJT) or coherent joint transmission (CJT) CSI measurement and / or report.
[0046] For example, as shown in FIG. 5 illustrating an example scenario 500 under schemes in accordance with implementations of the present disclosure, the table is a codepoint table. Referring to FIG. 3 together, in this codepoint table, code point (i.e., index) ‘0’ represents DMRS port {1006} used for UE#1, code point ‘1’ represents DMRS port {1009} used for UE#3, code point ‘2’ represents DMRS port {1010} used for UE#4, code point ‘3’ represents a pair of DMRS ports {1007~1008} used for UE#2 and {1009} used for UE#3, code point ‘4’ represents a pair of DMRS ports {1009} used for UE#3 and {1010} used for UE#4, and code point ‘5’ represents a pair of DMRS ports {1010} used for UE#4 and {1011} used for UE#5.
[0047] According to the codepoint table, in an event that the network node needs the UE to measure DMRS port {1006} for CMR, the network node transmits the DCI to the UE while a specific field of the DCI used for CMR has value ‘0’ . In an event that the network node needs the UE to measure DMRS ports {1009} and {1010} for IMR (i.e., measure UE#2 and UE#3 for interference measurement) , the network node transmits the DCI to the UE while a specific field of the DCI used for IMR has value ‘4’ .
[0048] In some implementations, after receiving the DCI indicating the at least one of the CMR and the IMR, the UE may measure the CMR and the IMR to determine a CSI report based on the DCI and the CSI report configuration associated with the CSI report request. More specifically, based on the CSI report request from the network node, the UE may measure the CMR and the IMR to derive some channel information (e.g., a rank indicator (RI) , a precoding matrix indicator (PMI) and / or a channel quality indicator (CQI) ) , and transmit the CSI report including this channel information to the network node based on the corresponding CSI report configuration.
[0049] In some implementations, the CMR may be configured in the CSI report configuration for the UE. The IMR may be configured or may not be configured in the CSI report configuration for the UE. In an event that both the CMR and the IMR are configured in the CSI report configuration, the UE may measure the CMR and the IMR based on the CSI report configuration. In an event that the CMR is configured in the CSI report configuration, but the IMR is not configured in the CSI report configuration, the UE may measure the CMR based on the CSI report configuration and measure (i.e., determine) the IMR in other ways.
[0050] In some cases, in the event that the IMR is DMRS port indicated in the CSI report configuration, the UE may measure (i.e., determine) the IMR based on power. In particular, the UE may estimate a lump sum interference by subtracting a desired DMRS power from a received power of DMRS resource.
[0051] In some cases, in the event that the IMR is not configured in the CSI report configuration, the UE measures (i.e., determines) the IMR based on at least one remaining DMRS port of PDSCH. For example, in an event that the UE is indicated to use DMRS ports {0, 1} and RANK (i.e., the indicator parameter of MIMO data stream capacity) is 1 for PDSCH by the DCI, the UE uses DMRS port {0} for the RANK=1 PDSCH transmission. In an event that the UE is triggered to transmit the CSI report by the same DCI, the UE uses (a) DMRS port {0} for the RANK=1 PDSCH transmission and the CMR measurement and (b) DMRS port {1} for the IMR measurement.
[0052] In some cases, in the event that the IMR is not configured in the CSI report configuration, the UE may measure (i.e., determine) the IMR based on at least one port of a paired DMRS port (s) of the DMRS port (s) of PDSCH. For example, the UE is indicated to use DMRS ports {0, 1} for PDSCH by the DCI, and DMRS ports {2, 3} are the paired DMRS ports. In an event that the UE is triggered to transmit the CSI report by the same DCI, the UE uses (a) DMRS ports {0, 1} for the PDSCH transmission and the CMR measurement and (b) DMRS ports {2, 3} for the IMR measurement. In some cases, the paired DMRS port (s) may be predefined (e.g., predefined in 3GPP specifications) or dynamically indicated by DCI, RRC or MAC-CE.
[0053] In some cases, in the event that the IMR is not configured in the CSI report configuration, the UE may measure (i.e., determine) the IMR based on the above methods. For example, in an event that the UE is indicated to use DMRS ports {0, 1} and RANK=1 for PDSCH by the DCI, the UE uses DMRS port {0} for the RANK=1 PDSCH transmission. In an event that the UE is triggered to transmit the CSI report by the same DCI and the DMRS ports {2, 3} are the paired DMRS ports, the UE uses (a) DMRS port {0} for the RANK=1 PDSCH transmission and the CMR measurement and (b) DMRS ports {1, 2, 3} for the IMR measurement or DMRS port {1} for inter-cell interference measurement (CSI-IM) and DMRS ports {2, 3} for the IMR measurement.
[0054] In some cases, in the event that the IMR is not configured in the CSI report configuration, frequency-domain resource (s) for DMRS of PDSCH and the IMR may be configured by RRC, MAC-CE or DCI. The DCI may have at least one field to indicate the frequency-domain resource (s) for DMRS of PDSCH or the IMR.
[0055] In some embodiments, the network node may obtain a CSI based on a sounding reference signal (SRS) or the CSI report from the UE. The UE may be scheduled with a PDSCH and triggered to use the PDSCH, CSI-RS or DMRS for channel measurement and interference measurement. The CSI report may be determined based on the channel measurement and interference measurement. In some cases, the CSI report may include one of: (a) CQI or (b) RI and CQI.
[0056] In some implementations, the CSI report configuration may include RS resource (s) for the CMR and / or RS resource (s) for the IMR. In other words, the CMR and / or the IMR may be configured in the CSI report configuration.
[0057] In some cases, the CMR may be configured in the CSI report configuration, and the RS resource for the CMR may include CSI-RS resource, DMRS port or PDSCH resource. In an event that the CMR is DMRS port, the UE may be indicated DMRS port information by DCI, RRC or MAC-CE.
[0058] In some cases, the CMR may not be configured in the CSI report configuration. The CMR may be resource (s) of a scheduled PDSCH or DMRS port (s) of the scheduled PDSCH by default.
[0059] In some cases, the IMR may be configured in the CSI report configuration. The RS resource for the IMR may be zero power CSI-RS (ZP CSI-RS) resource, NZP CSI-RS resource, DMRS port or PDSCH resource.
[0060] In an event that the IMR (or CSI-IM) is ZP CSI-RS, the UE may measure the interference from other network nodes.
[0061] In an event that the IMR is NZP CSI-RS, the UE may measure the interference from multiple TRPs, multiple beams or MU-MIMO.
[0062] In an event that the IMR is DMRS port of PDSCH, the UE may estimate a lump sum interference by subtracting a desired DMRS power from a received power of DMRS port.
[0063] For example, a received PDSCH signal of a desired kth cell may be represented as: where ypdsch may be the received PDSCH signal, may be a baseband modulation symbol by applying a precoder on Hk MIMO channel, HlPl may be an effective channel of lth cell which introduce an inter-cell interference to the desired kth cell, and a total interference-plus-noise at receiver side may be represented as
[0064] Further, a received DMRS signal may be represented as ydmrs=HkPkxk, dmrc+I. In an event that DMRS is configured as IMR, the interference-plus-noise may be estimated by subtracting the DMRS signal from the received DMRS signal ydmrs as: where may be an effective channel estimated from the DMRS. An interference-plus- noise covariance matrix may be obtained by Diagonal elements of Cdmrs may represent interference-plus-noise power per received antenna.
[0065] In an event that the IMR is PDSCH, the UE may estimate a lump sum interference by subtracting a desired DMRS power from the received power of PDSCH resource. DMRS to PDSCH power offset indicated by RRC, MAC-CE, or DCI may be considered when calculating signal to interference plus noise ratio (SINR) .
[0066] For example, a received PDSCH signal may be represented as: ypdsch=HkPkxk, pdsch+I where ypdsch may be the received PDSCH signal, may be a baseband modulation symbol by applying a precoder on Hk MIMO channel, and a total interference-plus-noise at receiver side may be represented as while HlPl may be an effective channel of lth cell which introduce an inter-cell interference to the desired kth cell.
[0067] In an event that PDSCH is configured as IMR, the interference-plus-noise may be estimated by subtracting the DMRS signal from the received signal ydmrs, as: where δoffset may be a power offset scaling factor between PDSCH and DMRS. The interference-plus-noise may be estimated by:
[0068] In an event that the PDSCH data is estimated in prior, the main difference from and being may include the inter-layer interference and inter-UE interference when other UE (s) is scheduled in the same PDSCH resource. In an event that an additional IMR is configured to measure the interference from the PDSCH overlapped UE, the first IMR may be configured as DMRS port or ZP CSI-RS resource. The interference-plus-noise covariance matrix may be obtained by
[0069] In some cases, the IMR may be configured in the CSI report configuration. The IMR may be resource (s) of the scheduled PDSCH or the DMRS port (s) of the scheduled PDSCH by default.
[0070] In some cases, the UE may be indicated the IMR including other / additional DMRS port (s) (i.e., different DMRS port (s) other than DMRS port of PDSCH) . The other DMRS port (s) may be fully overlapped, non-overlapped or partial-overlapped with the DMRS port of PDSCH for the UE.
[0071] In an event that the other DMRS port (s) is fully overlapped with the DMRS port of PDSCH for the UE, the network node may indicate DMRS port information through DCI and / or MAC-CE for the interference measurement of the other DMRS port (s) .
[0072] For example, as shown in FIG. 6 illustrating an example scenario 600 under schemes in accordance with implementations of the present disclosure, the PDSCH for the UE is fully overlapped with a co-scheduled UE PDSCH. A DMRS antenna port index of the UE is “2” , which is indicated by an “antenna port” filed in the DCI.
[0073] Further, to report an MU CQI, an additional IMR is configured in the CSI report configuration for MU-MIMO interference measurement. A DMRS antenna port table is preconfigured for IMR measurement. Then the network node uses the DCI to indicate the DMRS port indices. The DMRS antenna port table is configured by RRC and / or MAC-CE.
[0074] In this example, a DCI value of “6” is indicated to the UE. A received signal from DMRS ports {0, 1} is respectively represented as: An MU interference covariance is calculated by:
[0075] In an event that the other DMRS port (s) is non-overlapped or partial-overlapped with the UE, the network node may indicate the frequency-domain resources and the DMRS port information for the interference measurement of the other DMRS port (s) .
[0076] For example, as shown in FIG. 7 illustrating an example scenario 700 under schemes in accordance with implementations of the present disclosure, the PDSCH for the UE is non-overlapped with a co-scheduled UE PDSCH. In an event that the UE and the co-scheduled UE are the potential UEs for MU-MIMO, the network node indicates DMRS frequency-domain resources and port information in the DCI to the UE to measure the interference of the co-scheduled UE.
[0077] Further, a DMRS frequency-domain resource allocation of an interfering UE (i.e., the co-scheduled UE) is indicated by a resource indication value (RIV) , a bitmap or a codepoint table. When the DMRS frequency-domain resource allocation is indicated by the RIV, PDSCH resource allocation Type 1 is considered for contiguous resource allocation. When the DMRS frequency-domain resource allocation is indicated by the bitmap, the bitmap is used to indicate a set of resource block as shown in FIG. 8 while value ‘0’ represents no interference and value ‘1’ represents sub-carrier interferences caused from the co-scheduled UE. When the DMRS frequency-domain resource allocation is indicated by the codepoint table as shown in FIG. 9, an IMR frequency domain allocation set is configured by RRC. The network node dynamically indicates the codepoint through the DCI.
[0078] For another example, the other DMRS port (s) is the remaining DMRS port (s) or the paired DMRS port (s) of a CDM group of the DMRS port (s) of PDSCH.
[0079] In some cases, the UE may be indicated a period or multiple slot PDSCH for the CMR measurement or the IMR measurement. In particular, the UE may determine results of the CMR measurement or the IMR measurement within the period or within the multiple slot PDSCH in one CSI report. The DCI may include a field to indicate that previous CMR measurement or previous IMR measurement may be used (e.g., combined) for the present CMR measurement or the present IMR measurement.
[0080] In some implementations, to avoid frequent CQI reports for consecutive PDSCH slots or multiple PDSCH slots within a short time, one CSI report may be associated with one PDSCH / DCI, multiple PDSCHs / DCIs or one PDSCH associated with multi-PDSCH scheduling by a DCI. In other words, multiple CSI reports (or measurements) for corresponding one or more items of the table of CMR and IMR candidates may be merged or combined into one CSI report to be transmitted.
[0081] In some implementations, regarding CSI triggering, the UE may be triggered to transmit the CSI report by a downlink (DL) DCI or an uplink (UL) DCI (e.g., DCI having format 1_1, DCI having format 1_2, etc. )
[0082] In some implementations, regarding CSI triggering, the DCI may include at least one of a feedback timing, an UL resource indicator, a CSI association, etc. for the CSI report.
[0083] In some implementations, the DCI may include a field to indicate whether specific DCI(s) (e.g., designated DCI (s) or previous DCI (s) ) and at least one of another CMR and another IMR corresponding to the specific DCI (s) are used for channel measurement or interference measurement.
[0084] In some cases, the specific DCI (s) and the at least one of another CMR and another IMR corresponding to the specific DC may be transmitted: (1) in a predefined time window or an RRC configured time window.
[0085] In some cases, the DCI and the specific DCI may trigger a joint CSI report based on corresponding individual measurement results and joint measurement results. In particular, the DCI and the specific DCI may be used to trigger the joint CSI report. The joint CSI report may include: (1) one measurement result corresponding to the DCI and one measurement result corresponding to the specific DCI, or (2) one joint measurement result corresponding to both the DCI and the specific DCI. The joint measurement results may be derived from the average of CMRs and IMRs corresponding to both the DCI and the specific DCI.
[0086] In some cases, the CSI association may indicate which CSI measurement (s) or CSI report (s) needs to be merged or combined. For example, the CSI association includes an identification, and the CSI measurement (s) or CSI report (s) with the same identification are merged or combined. A storage period for the CSI measurement (s) or CSI report may be defined (e.g., predefined based on 3GPP specifications) or indicated in DCI, MAC-CE or RRC configuration. For another example, the CSI association includes a bitmap to indicate which CSI measurement (s) or CSI report (s) in a period that needs to be merged or combined. For another example, the CSI association includes a flag to indicate whether the last CSI measurement (s) or CSI report (s) with the same CSI report configuration needs to be merged or combined.
[0087] In some implementations, regarding feedback timing, the UE may be indicated: (1) that the CSI report may be transmitted along with HARQ ACK / NACK in PUCCH, or (2) a CSI report state in the DCI or a higher layer signaling, and then the UE may feedback the CSI report in PUSCH or PUCCH following the CSI report state.
[0088] In some implementations, at least one of a PMI, a CQI and differential CQIs may be utilized in the CSI report for multiple CSIs. The multiple CSIs could include multiple CQIs. The CQI may correspond to the first of the multiple CSIs and the differential CQIs could be the differences between the CQI and the other CQIs. In some cases, a frequency granularity of the PMI, the CQI and the differential CQIs may be configured as wideband or subband.
[0089] In some implementations, at least one of wideband precoding index (e.g., W1 of PMI W=W1xW2 defined in 3GPP specification) , an average CQI and relative CQIs may be utilized in the CSI report for the multiple CSIs.
[0090] In some implementations, regarding CSI report designs, the CSI report may include CQI. The CQI may include: (1) absolute value of CQI (e.g., the CQI used in NR) or (2) differential CQI value of the scheduled PDSCH or a previous CQI. In an event that the CQI is configured as subband feedback, the first CQI may be the normal CQI value for a subband resource and the remaining CQI (s) for the remaining subband resource (s) may be indicated by the differential value between the first CQI and the remaining CQIs.
[0091] In some implementations, regarding CSI report designs, multiple CQIs may be determined as one CQI in an event that the multiple CQIs are associated with the same measurement resource or feedback PUCCH or PUSCH resource. In particular, the multiple CQIs may be averaged into one CQI or be determined based on the differential CQI values of the first CQI to reduce the feedback size.
[0092] In some implementations, regarding CSI report designs, the UE may feedback lower rank than the rank of PDSCH. The CSI report may be determined based on multiple CSI measurements in multiple transmission time intervals (TTIs) .
[0093] It should be noted that the received data from PDSCH may be expressed as where is the PDSCH digital precoder, is the data symbol and Lpdsch is the number of transmitted layer of this PDSCH.
[0094] In some embodiments, regarding some normal scenarios, received data from PDSCH may be expressed as y=HPpdschx+I+n where may be the PDSCH digital precoder, may be the data symbol and Lpdsch may be the number of transmitted layer of the PDSCH. Regarding some enhanced scenarios, the network node may transmit additional DMRS port (s) on PDSCH for channel measurement. The UE may measure an effective channel on the DMRS port (s) where may be the precoding vectors applied on the additional DMRS port (s) . For SU-MIMO, the total number of DMRS port (s) may be L=Lpdsch+Ladd. For MU-MIMO, the total number of DMRS port (s) may be Lmax=L+LMU where LMU the total number of DMRS port (s) from other UEs.
[0095] In some implementations, regarding the normal scenarios, the UE may obtain CMR channel information HP in normal scenarios. Regarding the enhanced scenarios, the UE may measure more channel information Heff=H [PpdschPadd] by the DMRS port (s) of PDSCH and the addition DMRS port (s) , in which the addition DMRS port (s) may be the remaining DMRS port (s) or the paired DMRS port (s) of the CDM group of the DMRS port (s) of PDSCH or individually indicated. With more channel information, the UE may further update the rank value and the PMI.
[0096] In some implementations, the network node may indicate the additional DMRS port information through DCI. In some cases, the network node may configure the additional DMRS port information by RRC.
[0097] For example, a number of additional DMRS port (s) for enhanced scenarios is configured by RRC. In an event that configuration associated with the number of additional DMRS port (s) is configured as ‘2’ , the additional DMRS ports are the first two ports of subsequent DMRS port (s) , the remaining DMRS port (s) of the CDM group of the DMRS port (s) of PDSCH or the DMRS port (s) of the paired CDM group of the DMRS port (s) of PDSCH. It should be noted that the grouping rules of DMRS ports may be predefined (e.g., predefined based on 3GPP specifications) or configured by RRC or MAC-CE.
[0098] For further example as shown in FIG. 10, the network node dynamically uses DCI to indicate the number of additional DMRS port (s) based on the table. In an event that the DCI-indicated DMRS ports of PDSCH are {1002, 1003} and the number of additional DMRS port (s) is ‘2’ indicated by value ‘0’ of a specific field of the DCI, the antenna ports for the UE are {1002, 1003, 1004, 1005} .
[0099] In some implementations, the CSI report configuration may include RS resource (s) for the CMR and / or RS resource (s) for the IMR. In other words, the CMR and / or the IMR may be configured in the CSI report configuration.
[0100] In some cases, the CMR may include DMRS port with additional DMRS port (s) . The network node may indicate the DMRS port information by a DCI for the UE.
[0101] FIG. 11 illustrates an example scenario 1100 under schemes in accordance with implementations of the present disclosure. For example, the CSI report configuration is for SU-MIMO CSI. DMRS port (s) is configured as the CSI resource for CMR. CSI-RS resource (s) or DMRS port (s) of PDSCH is configured as the CSI resource for IMR. The network node indicates the DMRS port (s) of PDSCH and additional DMRS port (s) through the DCI. In an event that Lpdsch=2 and Ladd=2 are indicated for two-layer PDSCH and additional DMRS port (s) . The DMRS ports of PDSCH are and are used for CMR.
[0102] Further, based on DMRS ports {1000, 1001} , the UE estimates the channel quality of PDSCH data. Based on DMRS ports {1000, 1001, 1002, 1003} , the UE estimates the channel quality for up-to-four layers transmission.
[0103] It should be noted that Lpdsch and Ladd may be indicated by at least one field of the DCI. Lpdsch may be indicated by the DMRS port number of PDSCH. Ladd may be the remaining DMRS port number of the CDM group of the DMRS port (s) of PDSCH or the DMRS port number of the paired CDM group of the DMRS port (s) of PDSCH. For another example, the DMRS port of PDSCH is {1000} and the remaining DMRS port of the same CDM group (e.g., CDM Group 0) is {1001} , and the DMRS ports of the paired CDM group (e.g., CDM Group 1) of the DMRS port (s) of PDSCH are {1002, 1003} . It should be noted that the grouping rules of DMRS ports may be predefined (e.g., predefined based on 3GPP specifications) or configured by RRC / MAC-CE.
[0104] In these examples, in an event that the IMR is ZP CSI-RS resource, the UE measures the interference from other network nodes. In an event that the IMR is DMRS port of PDSCH, the UE estimates a lump sum interference by subtracting a desired DMRS power from a received power of PDSCH / DMRS resource.
[0105] In some cases, the IMR may be configured in the CSI report configuration. The RS resource for the IMR may be ZP CSI-RS resource, NZP CSI-RS resource, DMRS port or PDSCH resource.
[0106] In an event that the IMR (or CSI-IM) is ZP CSI-RS, the UE may measure the interference from other network nodes.
[0107] In an event that the IMR is NZP CSI-RS, the UE may measure the interference from multiple TRPs, multiple beams or MU-MIMO.
[0108] In an event that the IMR is the DMRS of PDSCH, the UE may estimate a lump sum interference by subtracting a desired DMRS power from a received power of DMRS resource.
[0109] In an event that the IMR is PDSCH, the UE may estimate a lump sum interference by subtracting a desired DMRS power from the received power of PDSCH resource. DMRS to PDSCH power offset indicated by RRC, MAC-CE, or DCI may be considered when calculating signal to interference plus noise ratio (SINR) .
[0110] In some cases, the UE may be indicated the IMR including other / additional DMRS port (s) (i.e., different DMRS port (s) other than DMRS port of PDSCH) .
[0111] FIG. 12 illustrates an example scenario 1200 under schemes in accordance with implementations of the present disclosure. For example, the CSI report configuration is for MU-MIMO CSI. DMRS port is configured as the CSI resource for CMR. ZP CSI-RS resource or PDSCH resource / DMRS port is configured as the CSI resource for IMR. An additional DMRS port or NZP CSI-RS resource is configured for the interference measurement of other co-scheduled UE (s) .
[0112] The network node implicitly or explicitly indicates the DMRS port (s) through the DCI for MU-MIMO interference measurement. In this example, UE#2 and UE#3 are co-scheduled with the UE. Two-layer and one-layer PDSCH data are respectively transmitted to UE#2 and UE#3 through DMRS ports {1004, 1005, 1006} . DMRS ports {1004, 1005, 1006} is indicated for MU-MIMO interference measurement. LMU is the remaining DMRS port number of the CDM group of the DMRS port (s) of PDSCH or the DMRS port number of the paired CDM group of the DMRS port (s) of PDSCH. In this example, The DMRS port of PDSCH is {1000} and the remaining DMRS port of the same CDM group is {1001} , and the DMRS ports of the paired CDM group of the DMRS port (s) of PDSCH are {1002, 1003} . It should be noted that the grouping rules of DMRS ports may be predefined (e.g., predefined based on 3GPP specifications) or configured by RRC / MAC-CE.
[0113] The DCI includes a field to indicate that the DMRS port (s) for MU-MIMO interference measurement uses the remaining DMRS port (s) of the CDM group of the DMRS port (s) of PDSCH or the DMRS ports of the paired CDM group of the DMRS port (s) of PDSCH. The field further indicates the additional DMRS port (s) for Ladd.
[0114] In some cases, the UE may be indicated the IMR including other / additional DMRS port (s) (i.e., different DMRS port (s) other than DMRS port of PDSCH) . The other DMRS port (s) may be fully overlapped, non-overlapped or partial-overlapped with the DMRS resource of PDSCH for the UE.
[0115] In an event that the other DMRS port (s) is fully overlapped with the DMRS port of PDSCH for the UE, the network node may indicate DMRS port information through DCI and / or MAC-CE for the interference measurement of the other DMRS port (s) .
[0116] In an event that the other DMRS port (s) is non-overlapped or partial-overlapped with the UE, the network node may indicate the frequency-domain resources and the DMRS port information for the interference measurement of the other DMRS port (s) .
[0117] In some cases, the other DMRS port (s) may be the remaining DMRS port (s) or the paired DMRS port (s) of a CDM group of the DMRS port (s) of PDSCH.
[0118] In some cases, the UE may be indicated a period or multiple slot PDSCH for the CMR measurement or the IMR measurement. In particular, the UE may determine results of the CMR measurement or the IMR measurement within the period or within the multiple slot PDSCH in one CSI report. The DCI may include a field to indicate that previous CMR measurement or previous IMR measurement may be used (e.g., combined) for the present CMR measurement or the present IMR measurement.
[0119] In some implementations, regarding the enhanced scenarios, the CSI report may include: (a) {CQI} or (b) {RI, CQI} . In an event that an RI needed to be reported is the same as the number of PDSCH layer, the RI may not be reported while a CQI may be the only reported quantity. The reported CQI may be implicitly associated with the number of PDSCH layer. For example, the UE reports either {CQI} or {RI, CQI} depending on which report content represents a best channel capability. In an event that the RI is different from the number of PDSCH layer, the UE may report: (1) either {CQI} where the CQI is associated with number of PDSCH layer, or {RI, CQI} where the RI is new and updated to the network node; or (2) both {CQI} and {RI, CQI} .
[0120] It should be noted that {CQI} may be associated with the number of PDSCH layer, which indicates the network node of the signal quality of the PDSCH data. {RI, CQI} may indicate the network node of the new RI and the CQI information. The CSI report may be configured by RRC and / or MAC-CE or indicated by DCI.
[0121] In some implementations, regarding the normal scenarios or the enhanced scenarios, the CSI report may include: (a) {CQI} , (b) {PMI, CQI} or (c) {RI, PMI, CQI} .
[0122] In some cases, the network node may estimate a network node-to-UE channel H=UΣVH from SRS. The network node may directly use a right singular vector as a precoder. The network node may use precoding vectors on PDSCH resource / DMRS port and on the additional DMRS port (s) .
[0123] In some cases, the UE may select at least one DMRS port (e.g., one beam) index by reporting a port selection PMI. This PMI may include the port selection and / or port ordering information.
[0124] For example, the CSI report includes {RI, PMI, CQI} where the PMI includes the port selection and port ordering information. The number of PDSCH layer Lpdsch=2 and total DMRS ports Lmax=4. The received signal on DMRS port is denoted as y=H· [v1v2v3v4] ·x+n where PPDSCH= [v1v2] is the precoding vector for PDSCH. In an event that a two-layer precoding vector P′PDSCH= [v1v3] provides better channel capacity, the UE reports a port selection PMI W (RI) =[ei, 1ei, 2] where ei, v is a Lmax element column vector containing “1” in ith element and “0” elsewhere. In this example, P′PDSCH= [v1v3] = [v1v2v3v4] ·[e1, 1e3, 2]. In an event that a three-layer precoding vector P′PDSCH= [v1v3v2] provides better channel capacity, the port selection PMI [e1, 1e3, 2e2, 3] is reported by the UE.
[0125] Accordingly, in general, while W (RI) is the reported PMI. It should be noted that the PMI may provide at least one of the port selection, port ordering and codeword to layer mapping information to the network node.
[0126] In some cases, the PMI may include the port selection information and / or beam group selection information in an event that the network node transmits several beam groups on the DMRS port (s) .
[0127] For example, the CSI report includes {RI, PMI, CQI} where the PMI includes the port selection and beam group information. In an event that the network node has multiple beams, the network node determines to transmit at least two groups DMRS port (s) for the UE to measure. Different groups correspond to different beam directions. Based on performing the DMRS measurement, the UE selects a preferred port group. The DMRS port (s) of a first beam group is the DMRS port (s) of PDSCH. The DMRS port (s) of a second beam group is (1) the remaining DMRS port (s) of the CDM group of the DMRS port (s) of PDSCH or (2) the DMRS port (s) of the paired CDM group of the DMRS port (s) of PDSCH. It should be noted that the grouping rules of DMRS ports may be predefined (e.g., predefined based on 3GPP specifications) or configured by RRC or MAC-CE.
[0128] Accordingly, in general, while is associated with the first beam group, is associated with the second beam group and W (RI) is the reported PMI. The UE may select the beam group and port by report the PMI W (RI) .
[0129] It should be noted that the PMI may provide at least one of the port selection, port ordering, beam group, and codeword to layer mapping information to the network node. The PMI may include a normal PMI such as 3GPP specification NR release 15 Type I PMI, 3GPP specification NR release 16 Type II, etc.
[0130] In some cases, the PMI may include the port selection information and / or additional coefficients / co-phasing information. The additional coefficients / co-phasing information may be used while the network node applies additional precoding on the DMRS port (s) .
[0131] For example, the UE measures an effective channel from DMRS. The effective channel is represented as: where is a DMRS precoder. The UE derives a right eigenvector V of the effective channel by performing singular value decomposition (SVD) operation. The UE reports RI≤Lpdsch as additional coefficients for PMI tracking. Based on the reported PMI, the network node fine tunes the precoder by Pnew= P·V where P is an anchor precoder for previous PDSCH / DMRS transmission. If additional DMRS ports are transmitted by the network node, the effective channel measured from DMRS is represented as: where L=Lpdsch+Ladd is the total number of DMRS port (s) . In this example, the UE reports V∈CL×RI, RI≤L as additional coefficients for PMI tracking.
[0132] In some implementations, the UE may report: (1) either {CQI} where CQI is associated with the number of PDSCH layer, or {RI, PMI, CQI} depending on which report content includes the best channel capability or (2) both {CQI} and {RI, PMI, CQI} .
[0133] In some cases, in an event that the RI needed to be reported in {RI, PMI, CQI} is the same as the number of PDSCH layer, the CSI report may include {PMI, CQI} without RI. The reported {PMI, CQI} may be implicitly associated with the number of PDSCH layer.
[0134] It should be noted that {CQI} may be associated with the number of PDSCH layer, which indicates the network node the signal quality of the PDSCH data. The CSI report may be configured by RRC and / or MAC-CE or indicated by DCI.
[0135] In some cases, for rate matching of PDSCH, the UE may be explicitly indicated which DMRS port (s) , DMRS symbol (s) , DMRS CDM group (s) need to be considered in the used rate matching pattern of PDSCH by RRC, MAC-CE, or DCI. In some cases, the UE may be implicitly indicated which DMRS port (s) , DMRS symbol (s) , DMRS CDM group (s) need to be considered in the used rate matching pattern of PDSCH by the CDM group of DMRS port (s) of PDSCH or the CDM group of the other DMRS port (s) of IMR for rate matching of PDSCH, in which the used rate matching pattern of PDSCH includes the DMRS ports of the CDM group (s) . Illustrative Implementations
[0136] FIG. 13 illustrates an example communication system 1300 having an example communication apparatus 1310 and an example network apparatus 1320 in accordance with an implementation of the present disclosure. Each of communication apparatus 1310 and network apparatus 1320 may perform various functions to implement schemes, techniques, processes and methods described herein pertaining to CSI measurement with respect to UE and network apparatus in mobile communications, including scenarios / schemes described above as well as processes 1400 and 1500 described below.
[0137] Communication apparatus 1310 may be a part of an electronic apparatus, which may be a UE such as a portable or mobile apparatus, a wearable apparatus, a wireless communication apparatus or a computing apparatus. For instance, communication apparatus 1310 may be implemented in a smartphone, a smartwatch, a personal digital assistant, a digital camera, or a computing equipment such as a tablet computer, a laptop computer or a notebook computer. Communication apparatus 1310 may also be a part of a machine type apparatus, which may be an IoT, NB-IoT, or IIoT apparatus such as an immobile or a stationary apparatus, a home apparatus, a wire communication apparatus or a computing apparatus. For instance, communication apparatus 1310 may be implemented in a smart thermostat, a smart fridge, a smart door lock, a wireless speaker or a home control center. Alternatively, communication apparatus 1310 may be implemented in the form of one or more integrated-circuit (IC) chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, one or more reduced-instruction set computing (RISC) processors, or one or more complex-instruction-set-computing (CISC) processors. Communication apparatus 1310 may include at least some of those components shown in FIG. 13 such as a processor 1312, for example. Communication apparatus 1310 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and / or user interface device) , and, thus, such component (s) of communication apparatus 1310 are neither shown in FIG. 13 nor described below in the interest of simplicity and brevity.
[0138] Network apparatus 1320 may be a part of a network apparatus, which may be a network node such as a satellite, a base station, a small cell, a router or a gateway. For instance, network apparatus 1320 may be implemented in an eNodeB in an LTE network, in a gNB in a 5G / NR, IoT, NB-IoT or IIoT network or in a satellite or base station in a 6G network. Alternatively, network apparatus 1320 may be implemented in the form of one or more IC chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, or one or more RISC or CISC processors. Network apparatus 1320 may include at least some of those components shown in FIG. 13 such as a processor 1322, for example. Network apparatus 1320 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and / or user interface device) , and, thus, such component (s) of network apparatus 1320 are neither shown in FIG. 13 nor described below in the interest of simplicity and brevity.
[0139] In one aspect, each of processor 1312 and processor 1322 may be implemented in the form of one or more single-core processors, one or more multi-core processors, or one or more CISC processors. That is, even though a singular term “aprocessor” is used herein to refer to processor 1312 and processor 1322, each of processor 1312 and processor 1322 may include multiple processors in some implementations and a single processor in other implementations in accordance with the present disclosure. In another aspect, each of processor 1312 and processor 1322 may be implemented in the form of hardware (and, optionally, firmware) with electronic components including, for example and without limitation, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors and / or one or more varactors that are configured and arranged to achieve specific purposes in accordance with the present disclosure. In other words, in at least some implementations, each of processor 1312 and processor 1322 is a special-purpose machine specifically designed, arranged and configured to perform specific tasks including CSI measurement in a device (e.g., as represented by communication apparatus 1310) and a network (e.g., as represented by network apparatus 1320) in accordance with various implementations of the present disclosure.
[0140] In some implementations, communication apparatus 1310 may also include a transceiver 1316 coupled to processor 1312 and capable of wirelessly transmitting and receiving data. In other words, processor 1312 may transceive the data such as configuration, message, signal, information, indicator, etc. via transceiver 1316. In some implementations, communication apparatus 1310 may further include a memory 1314 coupled to processor 1312 and capable of being accessed by processor 1312 and storing data therein. In some implementations, network apparatus 1320 may also include a transceiver 1326 coupled to processor 1322 and capable of wirelessly transmitting and receiving data. In other words, processor 1322 may transceive the data such as configuration, message, signal, information, indicator, etc. via transceiver 1326. In some implementations, network apparatus 1320 may further include a memory 1324 coupled to processor 1322 and capable of being accessed by processor 1322 and storing data therein. Accordingly, communication apparatus 1310 and network apparatus 1320 may wirelessly communicate with each other via transceiver 1316 and transceiver 1326, respectively. To aid better understanding, the following description of the operations, functionalities and capabilities of each of communication apparatus 1310 and network apparatus 1320 is provided in the context of a mobile communication environment in which communication apparatus 1310 is implemented in or as a communication apparatus or a UE and network apparatus 1320 is implemented in or as a network node of a communication network.
[0141] In some implementations, each of memory 1314 and memory 1324 may include a type of random-access memory (RAM) such as dynamic RAM (DRAM) , static RAM (SRAM) , thyristor RAM (T-RAM) and / or zero-capacitor RAM (Z-RAM) . Alternatively, or additionally, each of memory 1314 and memory 1324 may include a type of read-only memory (ROM) such as mask ROM, programmable ROM (PROM) , erasable programmable ROM (EPROM) and / or electrically erasable programmable ROM (EEPROM) . Alternatively, or additionally, each of memory 1314 and memory 1324 may include a type of non-volatile random-access memory (NVRAM) such as flash memory, solid-state memory, ferroelectric RAM (FeRAM) , magnetoresistive RAM (MRAM) and / or phase-change memory. Illustrative Processes
[0142] FIG. 14 illustrates an example process 1400 in accordance with an implementation of the present disclosure. Process 1400 may be an example implementation of above scenarios / schemes, whether partially or completely, with respect to CSI measurement of the present disclosure. Process 1400 may represent an aspect of implementation of features of communication apparatus 1310. Process 1400 may include one or more operations, actions, or functions as illustrated by one or more of blocks 1410 to 1430. Although illustrated as discrete blocks, various blocks of process 1400 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 1400 may be executed in the order shown in FIG. 14 or, alternatively, in a different order. Process 1400 may be implemented by communication apparatus 1310 or any suitable UE or machine type devices. Solely for illustrative purposes and without limitation, process 1400 is described below in the context of communication apparatus 1310. Process 1400 may begin at block 1410.
[0143] At block 1410, process 1400 may involve processor 1312 of communication apparatus 1310 receiving a DCI. The DCI may indicate at least one of a CMR and an IMR based on a RS resource set. The RS resource set may include at least one of CSI-RS resource set, DMRS resource set and PDSCH resource set. Process 1400 may proceed from block 1410 to block 1420.
[0144] At block 1420, process 1400 may involve processor 1312 of communication apparatus 1310 measuring the CMR and the IMR to determine a CSI report. Process 1400 may proceed from block 1420 to block 1430.
[0145] At block 1430, process 1400 may involve processor 1312 of communication apparatus 1310 transmitting the CSI report.
[0146] In some implementations, the RS resource set associated with the CMR may include one of the DMRS resource set and PDSCH resource set.
[0147] In some implementations, the DCI may include at least one field to indicate at least one of a time-domain resource, a frequency-domain resource and a port information of the at least one of the CMR and the IMR.
[0148] In some implementations, the time-domain resource or the frequency-domain resource of the at least one of the CMR and the IMR is associated with a time-domain resource and a frequency-domain resource of a PDSCH scheduled by the DCI.
[0149] In some implementations, the at least one field may include at least one codepoint associated with at least one table of the time-domain resource, the frequency-domain resource and the port information of the at least one of the CMR and the IMR.
[0150] In some implementations, the DCI may include a field to indicate whether a specific DCI and at least one of another CMR and another IMR corresponding to the specific DCI are used for joint channel measurement or interference measurement.
[0151] In some implementations, the specific DCI and the at least one of another CMR and another IMR corresponding to the specific DC may be transmitted in a predefined time window or a radio resource control (RRC) configured time window.
[0152] In some implementations, the DCI and the specific DCI may trigger a joint CSI report based on corresponding individual measurement results and joint measurement results.
[0153] In some implementations, the DCI may include at least one field including at least one codepoint associated with at least one table of CMR and IMR candidates, and the at least one codepoint indicates the at least one of the CMR and the IMR.
[0154] In some implementations, an item of the at least one table of CMR and IMR candidates may include DMRS port groups or DMRS CDM groups.
[0155] In some implementations, the CSI report may include multiple CSI for corresponding one or more items of the at least one table of CMR and IMR candidates.
[0156] In some implementations, at least one of a PMI, a CQI and differential CQIs may be utilized in the CSI report for the multiple CSIs.
[0157] In some implementations, the frequency granularity of the PMI, the CQI and the differential CQIs is configured as wideband or subband.
[0158] In some implementations, the CMR may include one or more first DMRS port associated with a PDSCH scheduled by the DCI, and the port number of the one or more first DMRS port is the number of PDSCH layers.
[0159] In some implementations, the CMR may be associated with one or more second DMRS port.
[0160] In some implementations, the CSI report may include at least two CQIs, one of the at least two CQIs is determined based on the one or more first DMRS port, and the others of the at least two CQIs are determined based on the at least one of the one or more second DMRS port and the one or more first DMRS port.
[0161] In some implementations, the CSI report may include at least one of one or more ranks and one or more PMIs corresponding to the others of the at least two CQIs is determined based on the at least one of the one or more first DMRS ports and the one or more second DMRS ports.
[0162] In some implementations, the CSI report may include at least one of an RI, a PMI and a CQI. The PMI may include at least one of information of coefficients and co-phasing, a port selection and a port ordering information which is associated with the RI. The port selection information may include a selected precoded RS port or at least one group index of at least one DMRS port.
[0163] FIG. 15 illustrates an example process 1500 in accordance with an implementation of the present disclosure. Process 1500 may be an example implementation of above scenarios / schemes, whether partially or completely, with respect to CSI measurement of the present disclosure. Process 1500 may represent an aspect of implementation of features of network apparatus 1320. Process 1500 may include one or more operations, actions, or functions as illustrated by one or more of blocks 1510 to 1520. Although illustrated as discrete blocks, various blocks of process 1500 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 1500 may be executed in the order shown in FIG. 15 or, alternatively, in a different order. Process 1500 may be implemented by network apparatus 1320 or any suitable network device or machine type devices. Solely for illustrative purposes and without limitation, process 1500 is described below in the context of network apparatus 1320. Process 1500 may begin at block 1510.
[0164] At block 1510, process 1500 may involve processor 1322 of network apparatus 1320 transmitting a DCI for measuring a CMR and an IMR to determine a CSI report. The DCI may indicate at least one of the CMR and the IMR based on a RS resource set. The RS resource set may include at least one of CSI-RS resource set, DMRS resource set and PDSCH resource set Process 1500 may proceed from block 1510 to block 1520.
[0165] At block 1520, process 1500 may involve processor 1322 of network apparatus 1320 receiving the CSI report. Additional Notes
[0166] The herein-described subject matter sometimes illustrates different components contained within, or connected with, different other components. It is to be understood that such depicted architectures are merely examples, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively "associated" such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as "associated with" each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being "operably connected" , or "operably coupled" , to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being "operably couplable" , to each other to achieve the desired functionality. Specific examples of operably couplable include but are not limited to physically mateable and / or physically interacting components and / or wirelessly interactable and / or wirelessly interacting components and / or logically interacting and / or logically interactable components.
[0167] Further, with respect to the use of substantially any plural and / or singular terms herein, those having skill in the art can translate from the plural to the singular and / or from the singular to the plural as is appropriate to the context and / or application. The various singular / plural permutations may be expressly set forth herein for sake of clarity.
[0168] Moreover, it will be understood by those skilled in the art that, in general, terms used herein, and especially in the appended claims, e.g., bodies of the appended claims, are generally intended as “open” terms, e.g., the term “including” should be interpreted as “including but not limited to, ” the term “having” should be interpreted as “having at least, ” the term “includes” should be interpreted as “includes but is not limited to, ” etc. It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to implementations containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an, " e.g., “a” and / or “an” should be interpreted to mean “at least one” or “one or more; ” the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should be interpreted to mean at least the recited number, e.g., the bare recitation of "two recitations, " without other modifiers, means at least two recitations, or two or more recitations. Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. In those instances where a convention analogous to “at least one of A, B, or C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. It will be further understood by those within the art that virtually any disjunctive word and / or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B. ”
[0169] From the foregoing, it will be appreciated that various implementations of the present disclosure have been described herein for purposes of illustration, and that various modifications may be made without departing from the scope and spirit of the present disclosure. Accordingly, the various implementations disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
Claims
1.A method, comprising:receiving, by a processor of an apparatus, a downlink control information (DCI) , wherein the DCI indicates at least one of a channel measurement resource (CMR) and an interference measurement resource (IMR) individually associated with a reference signal (RS) resource set, wherein the RS resource set includes at least one of a channel state information (CSI) -RS resource set, a demodulation reference signal (DMRS) resource set and a physical downlink shared channel (PDSCH) resource set;measuring, by the processor, the CMR and the IMR to determine a CSI report; andtransmitting, by the processor, the CSI report.2.The method of Claim 1, wherein the RS resource set associated with the CMR includes at least one of a DMRS resource set and a PDSCH resource set.3.The method of Claim 1, wherein the DCI further includes at least one field to indicate at least one of a time-domain resource, a frequency-domain resource and a port information of the at least one of the CMR and the IMR.4.The method of Claim 3, wherein the time-domain resource or the frequency-domain resource of the at least one of the CMR and the IMR is associated with a time-domain resource and a frequency-domain resource of a physical downlink shared channel (PDSCH) scheduled by the DCI.5.The method of Claim 3, wherein the at least one field includes at least one codepoint associated with at least one table of the time-domain resource, the frequency-domain resource and the port information of the at least one of the CMR and the IMR.6.The method of Claim 1, wherein the DCI includes a field to indicate whether the channel measurement or interference measurement of at least one of another CMR and another IMR corresponding to a specific DCI are used for joint channel measurement or interference measurement.7.The method of Claim 6, wherein the at least one of another CMR and another IMR corresponding to the specific DC are in a predefined time window or a radio resource control (RRC) configured time window.8.The method of Claim 6, wherein the DCI triggers a joint CSI report based on corresponding individual measurement results and joint measurement results.9.The method of Claim 1, wherein the DCI further includes at least one field including at least one codepoint associated with at least one table of CMR and IMR candidates, and the at least one codepoint indicates the at least one of CMR and IMR candidates and corresponding resource information of the at least one of CMR and IMR candidates.10.The method of Claim 9, wherein one of the corresponding resource information of the at least one of CMR and IMR candidates includes one of a DMRS port group, a DMRS code division multiplexing (CDM) group, a CSI-RS resource set, a DMRS resource set, and a PDSCH resource set.11.The method of Claim 9, wherein the CSI report includes multiple CSIs corresponding one or more items of the at least one table of CMR and IMR candidates.12.The method of Claim 11, wherein at least one of a precoding matrix indicator (PMI) , a channel quality indicator (CQI) and differential CQIs is utilized in the CSI report for the multiple CSIs.13.The method of Claim 12, wherein a frequency granularity of the PMI, the CQI and the differential CQIs is configured as wideband or subband.14.The method of Claim 1, wherein the CMR includes one or more DMRS ports associated with a physical downlink shared channel (PDSCH) scheduled by the DCI, and the port number of the one or more DMRS ports is the number of PDSCH layers.15.The method of Claim 14, wherein the CMR is associated with one or more additional DMRS ports.16.The method of Claim 15, the CSI report includes at least two channel quality indicators (CQIs) , one of the at least two CQIs is determined based on the one or more first DMRS ports, and the others of the at least two CQIs are determined based on the at least one of the one or more additional DMRS ports and the one or more DMRS ports.17.The method of Claim 16, wherein the CSI report -includes at least two ranks or PMIs corresponding to the at least two CQIs.18.The method of Claim 1, wherein the CSI report includes at least one of a rank indicator (RI) , a precoding matrix indicator (PMI) and a channel quality indicator (CQI) , the PMI includes at least one of information of coefficients and co-phasing, a port selection and a port ordering information which is associated with the RI, and the port selection information includes a least one selected RS port or at least one group index of at least one DMRS port.19.A method, comprising:transmitting, by a processor of an apparatus, a downlink control information (DCI) for measuring a channel measurement resource (CMR) and an interference measurement resource (IMR) to determine a channel state information (CSI) report, wherein the DCI indicates at least one of the CMR and the IMR based on a reference signal (RS) resource set, wherein the RS resource set includes at least one of a CSI-RS resource set, a demodulation reference signal (DMRS) resource set and a physical downlink shared channel (PDSCH) resource set; andreceiving, by the processor, the CSI report.20.An apparatus, comprising:a transceiver which, during operation, wirelessly communicates with a wireless network; anda processor communicatively coupled to the transceiver such that, during operation, the processor performs operations comprising:receiving, via the transceiver, a downlink control information (DCI) , wherein the DCI indicates at least one of a channel measurement resource (CMR) and an interference measurement resource (IMR) based on a reference signal (RS) resource set, wherein the RS resource set includes at least one of a channel state information (CSI) -RS resource set, a demodulation reference signal (DMRS) resource set and a physical downlink shared channel (PDSCH) resource set;measuring the CMR and the IMR to determine a CSI report; andtransmitting, via the transceiver, the CSI report.
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