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EP4652680A1 - Retour de csi aux fins d'une adaptation de port - Google Patents

Retour de csi aux fins d'une adaptation de port

Info

Publication number
EP4652680A1
EP4652680A1 EP23713281.6A EP23713281A EP4652680A1 EP 4652680 A1 EP4652680 A1 EP 4652680A1 EP 23713281 A EP23713281 A EP 23713281A EP 4652680 A1 EP4652680 A1 EP 4652680A1
Authority
EP
European Patent Office
Prior art keywords
csi
resource
antenna port
antenna
configuration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23713281.6A
Other languages
German (de)
English (en)
Inventor
Yushu Zhang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Google LLC
Original Assignee
Google LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Google LLC filed Critical Google LLC
Publication of EP4652680A1 publication Critical patent/EP4652680A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity

Definitions

  • aspects of the present disclosure relate generally to wireless communication, and to port adaptation based on channel conditions in a wireless communication system.
  • MIMO Multiple-Input Multiple-Output
  • RRC radio resource control
  • the antenna port configuration identifies the number of downlink transmission antenna ports and antenna structure. For example, the antenna port configuration can indicate the number of horizontal antenna ports N1 and the number of vertical antenna ports N2.
  • the network entity selects a digital precoder for the MIMO transmission.
  • the network entity selects the digital precoder based on channel state information (CSI) that the network entity obtains from the UE in a CSI report.
  • CSI channel state information
  • the network entity configures and transmits a reference signal for the UE to measure.
  • the network entity can configure a CSI report by radio resource control (RRC) signaling (such as the CSI-ReportConfig information element in an RRC message) .
  • RRC signaling configures a channel state information reference signal (CSI-RS) that is used as channel measurement resource (CMR) for the UE to measure the downlink channel.
  • CSI-RS channel state information reference signal
  • the network entity might configure some interference measurement resource (IMR) for UE to measure interference. Based on the configured CMR and IMR, the UE can measure the channel conditions and determine the CSI.
  • the CSI might include at least one of a rank indicator (RI) , a precoding matrix indicator (PMI) , a channel quality indicator (CQI) , or a layer indicator (LI) .
  • RI and PMI are used to indicate the digital precoder.
  • CQI is used to indicate the signal-to-interference plus noise ratio (SINR) status so as to assist the network entity to determine the modulation and coding scheme (MCS) .
  • SINR signal-to-interference plus noise ratio
  • MCS modulation and coding scheme
  • LI is used to identify the strongest layer for the reported precoder indicated by RI and PMI.
  • 3GPP 3rd Generation Partnership Project
  • 3GPP TS 38.212 defines the CSI report on PUCCH
  • 3GPP TS 38.212 defines the CSI report on PUSCH
  • 3GPP TS 38.214 defines the procedure for CSI measurement and report based on Type 1 and Type 2 codebook.
  • the procedures for CSI measurement and report are based on a particular antenna port configuration set by the network entity. However, there might be instances in which the channel conditions could support a different antenna port configuration to reduce interference or reduce power consumption. Currently, there is no mechanism for a UE to obtain and report CSI for a different antenna port configuration.
  • the method includes receiving, via control signaling from a network entity, one or more channel state information (CSI) report configurations that indicate at least one CSI reference signal (CSI-RS) resource and that configures one or more CSI reports to include port adaptation information, receiving the at least one CSI-RS resource, and transmitting the one or more CSI reports with the port adaptation information based on measurements of the at least one CSI-RS resource, where the port adaptation information indicates at least one antenna port configuration and a respective CSI for the at least one antenna port configuration.
  • CSI channel state information
  • the method includes transmitting, via first control signaling to a user equipment (UE) , one or more channel state information (CSI) report configurations that indicate at least one CSI reference signal (CSI-RS) resource and that configures one or more CSI reports to include port adaptation information, transmitting the at least one CSI-RS resource, and receiving the one or more CSI reports with the port adaptation information, where the port adaptation information indicates at least one antenna port configuration and a respective CSI for the at least one antenna port configuration.
  • CSI channel state information
  • the apparatus includes a communication unit and a processing system.
  • the processing system is configured to control the communication unit to implement any one of the above-referenced methods.
  • FIG. 1 shows an example of a user equipment (UE) and network entity illustrating port adaptation according to some aspects of this disclosure.
  • UE user equipment
  • FIG. 2 illustrates an example antenna structure for a 16-port network entity.
  • FIG. 3A illustrates an example procedure for channel state information (CSI) measurement and reporting that includes port adaptation information.
  • CSI channel state information
  • FIG. 3B illustrates an example procedure for CSI measurement and reporting in which the UE reports CSI for multiple CSI-RS resource combinations corresponding to different antenna port configurations.
  • FIG. 4A illustrates an example procedure for CSI measurement and reporting in which the network entity configures different number of antenna ports for CSI measurement.
  • FIG. 4B illustrates an example procedure for CSI measurement and reporting in which the network entity configures different number of antenna ports for CSI measurement and the UE reports CSI for multiple CSI-RS resource combinations corresponding to different antenna port configurations.
  • FIG. 5A illustrates an example procedure for CSI measurement and reporting in which the UE reports CSI for a subset of or all the antenna ports of a CSI-RS.
  • FIG. 5B illustrates an example procedure for CSI measurement and reporting in which the UE reports CSI for multiple antenna port groups from among the antenna ports of a CSI-RS.
  • FIG. 6 illustrates an example process for a UE that supports CSI-based port adaptation.
  • FIG. 7 illustrates an example process for a network entity that supports CSI-based port adaptation.
  • FIG. 8 illustrates an example antenna port configuration that includes a 4-port CSI-RS resources configuration for a 16-port network entity.
  • FIG. 9 illustrates another example antenna port configuration that includes a 4-port CSI-RS resources configuration for a 16-port network entity.
  • FIG. 10 illustrates an example CSI-RS configuration with different number of ports.
  • FIG. 11 illustrates another example CSI-RS configuration with different number of ports.
  • FIG. 12 illustrates an example set of CSI measurement hypotheses in which the CSI measurement hypotheses are based on different antenna ports from a CSI-RS resource.
  • FIG. 13 illustrates another example set of CSI measurement hypotheses in which the CSI measurement hypotheses are based on different antenna ports from a CSI-RS resource.
  • FIG. 14 illustrates an example CSI measurement in which the UE measures a subset of the antenna ports for a CSI-RS resource.
  • FIG. 15 illustrates another example CSI measurement in which the UE measures a subset of the antenna ports for a CSI-RS resource.
  • the described implementations can be implemented in any device, system, or network that is capable of transmitting and receiving radio frequency signals according to any of the wireless communication standards, including any of the Institute of Electrical and Electronics Engineers (IEEE) 802.11, 802.15, or 802.16 wireless standards, or other known signals that are used to communicate within a wireless, cellular, or internet of things (IOT) network, such as a system utilizing 3G, 4G, 5G, WiFi or future radio technology.
  • IEEE Institute of Electrical and Electronics Engineers
  • 802.16 wireless standards or other known signals that are used to communicate within a wireless, cellular, or internet of things (IOT) network, such as a system utilizing 3G, 4G, 5G, WiFi or future radio technology.
  • IOT internet of things
  • the antenna port configuration refers to the quantity of antenna ports and polarization (such as the number of horizontal antenna ports N1 and number of vertical antenna ports N2) for a Multiple-Input Multiple-Output (MIMO) transmission.
  • a network entity such as a base station
  • the network entity selects the digital precoder based on channel state information (CSI) that the network entity obtains from a user equipment (UE) in a CSI report.
  • CSI channel state information
  • UE user equipment
  • Current CSI measurement and report is based on a certain antenna port configuration. Absent the techniques of this disclosure, the UE cannot recommend an antenna port configuration for downlink transmission or report CSI for more than one antenna port configuration.
  • Port adaptation refers to selection of a particular antenna port configuration based on CSI for more than one considered antenna port configuration.
  • a UE can provide one or more CSI reports with port adaptation information.
  • the term “one or more CSI reports with port adaptation information” also may be referred to as “CSI-based port adaptation, ” “port adaptation feedback information, ” or "CSI feedback. " CSI feedback enables the UE to provide additional information to the network entity regarding CSI for one or more antenna port configurations that are different from an antenna port configuration set by the network entity.
  • aspects of this disclosure enable a network entity to obtain one or more CSI reports with port adaptation information from a UE.
  • the network entity can transmit a CSI report configuration indicating at least one CSI reference signal (CSI-RS) resource for the UE to measure.
  • the CSI report configuration can indicate a list of CSI-RS resources.
  • the list of CSI-RS resources may include resources from the same set of antennas or using different combinations of antennas and polarities.
  • the UE can measure the one or more CSI-RS resources and transmit at least one CSI reports indicating the CSI for a particular CSI-RS and antenna port configuration.
  • the UE can report the CSI for each of a plurality of antenna port configurations.
  • a UE can use a codebook configuration or multiple codebook configurations to measure CSI for various CSI measurement hypotheses. Each CSI measurement hypothesis may be related to a different candidate antenna port configuration. After receiving the one or more CSI reports with port adaptation information, the network entity can select an antenna port configuration based on the CSI and port adaptation information. Aspects of this disclosure describe control signaling for CSI feedback and antenna port adaptation.
  • the techniques of this disclosure enable a network entity to adapt an antenna port configuration based on channel conditions.
  • the network entity can select an antenna port configuration (or a UE can recommend an antenna port configuration) that improves operation of the wireless communication system.
  • antenna port adaptation can have one or more advantageous effects such as reducing interference from downlink MIMO transmissions, reducing power consumption, or improving channel efficiency, among other examples.
  • FIG. 1 shows an example of a user equipment (UE) and network entity illustrating port adaptation according to some aspects of this disclosure.
  • the diagram 100 shows a UE 102 and a network entity 104 of a wireless communication system.
  • the network entity 104 can be a base station. Different types of base stations might be referred to as a NodeB, an LTE evolved NodeB (eNB) , a next generation NodeB (gNB) , an access point (AP) , a radio head, a transmit-receive point (TRP) , among other examples, depending on the wireless communication standard that the base station supports.
  • the network entity 104 is configured to use MIMO communication in which multiple antenna ports are used to transmit signals to the UE 102.
  • the network entity 104 selects an antenna port configuration and digital precoder for the MIMO transmission 118 and configures the antenna port configuration in an RRC message before transmitting the MIMO transmission 118.
  • the network entity 104 can use CSI to select the digital precoder.
  • the network entity 104 transmits a CSI report configuration 106 by RRC signaling, such as CSI-ReportConfig, to configure a CSI report.
  • the CSI report configuration 106 can indicate channel state information reference signal (CSI-RS) resources 110 for the UE 102 to measure the downlink channel conditions.
  • CSI-RS channel state information reference signal
  • the UE 102 is able to identify the CSI, which might include at least one of rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) and layer indicator (LI) .
  • RI and PMI are used to indicate the digital precoder.
  • CQI is used to indicate the signal-to-interference plus noise (SINR) status so as to assist the network entity to determine the modulation and coding scheme (MCS) .
  • LI is used to identify the strongest layer for the reported precoder indicated by RI and PMI.
  • the UE 102 measures the CSI-RS resources and reports CSI to the network entity 104 in a CSI report.
  • the network entity 104 can use the CSI (such as PMI, RI, LI) to select the digital precoder and layer for the MIMO transmission 118.
  • the UE 102 only reports CSI based on the configured CSI-RS resource and a certain number of downlink transmission antenna ports and antenna structure that the network entity 104 configures by RRC signaling.
  • the UE 102 would typically only measure the CSI-RS resource using the configured antenna ports.
  • fewer antenna ports than those configured by the network entity
  • the network entity 104 cannot be informed of the CSI that would be possible using a different antenna port configuration.
  • the network entity 104 can transmit a CSI report configuration 106 that requests port adaptation based on one or more CSI-RS resources and/or antenna port configurations 108.
  • the CSI report configuration 106 can indicate multiple CSI-RS resource configurations for the UE 102 to measure using different antenna port configurations.
  • the network entity 104 can configure CSI-RS resources that cover multiple antenna port combinations of the same quantity of antenna ports or different quantities of antenna ports.
  • the UE 102 can measure the one or more CSI-RS resources 110 using different antenna port configurations.
  • the UE 102 can report CSI for one or more antenna port configurations.
  • the CSI report 114 can be modified to include port adaptation information that indicates an antenna port configuration that corresponds to the reported CSI.
  • the UE 102 can report the CSI for a single CSI measurement hypothesis, such as the CSI that corresponds to the antenna port configuration providing the highest spectrum efficiency among the measured CSI for multiple antenna port configurations. In some other implementations, the UE 102 can report multiple CSIs so that the UE 102 can inform the network entity 104 of the CSI that corresponds to various antenna port configurations.
  • the network entity 104 can also inform the UE 102 regarding one or more codebooks that will be used for the MIMO transmission 118.
  • the UE 102 can report the PMI, RI, and LI (in some implementations) along with the CSI.
  • the one or more CSI reports 114 can include a separate CSI report for each CSI or a single CSI report containing an aggregation of CSI for multiple antenna port configurations. This disclosure describes CSI reporting schemes in which PMI, RI, and LI can be reported efficiently based on the type of codebook and how many CSIs are reported to the network entity 104.
  • the network entity 104 can configure a single CSI-RS resource in the CSI report configuration 106 and the UE 102 can measure and report CSI based on one or more subsets of antenna ports (and/or all antenna ports) from the configured CSI-RS resource.
  • the UE can measure multiple CSI measurement hypotheses based on the single CSI-RS resource and report CSI for a CSI measurement hypothesis having a different number of ports than the configured ports for the single CSI-RS resource. This enables the UE 102 to report CSI for an antenna port configuration that differs from the configured antenna ports for the single CSI-RS resource.
  • the network entity 104 can dynamically update the number of antenna ports for the MIMO transmission 118.
  • the network entity 104 can update the antenna port configuration using a media access control (MAC) control element (CE) or DCI before the MIMO transmission 118.
  • MAC media access control
  • CE control element
  • FIG. 2 illustrates an example antenna structure 200 for a 16-port network entity.
  • the network entity configures the number of horizontal antenna ports N1 and the number of vertical antenna ports N2.
  • the antenna port configuration of (N1, N2) (4, 2) for a dual-polarization antenna.
  • FIG. 2 shows 16 ports (numbered 3000 to 3015) . Absent the techniques of this disclosure, the network entity would transmit CSI-RS resources based on the 16 ports of the antenna structure 200. The UE would measure the CSI based on the 16-port antenna port configuration and report CSI for only that preconfigured antenna port configuration.
  • Table 1 illustrates the system level simulation results for the user throughput gain statistic for 32 ports case compared to the 16 ports case based on single-user MIMO (SU-MIMO) scheduling. It can be observed that more antenna ports cannot provide performance gain for 46.19%users.
  • SU-MIMO single-user MIMO
  • Table 1 User throughput gain statistic for 32 ports SU-MIMO compared to 16 ports SU-MIMO
  • FIG. 3A illustrates an example procedure 300a for channel state information (CSI) measurement and reporting that includes port adaptation information.
  • FIG. 3A shows operations of a network entity 104 and a UE 102, which may be same or similar to the network entity 104 and the UE 102, respectively, as described with reference to FIG. 1.
  • the operations of the network entity 104 can be implemented by any network entity, or any component thereof.
  • the operations of the UE 102 can be implemented by any UE, or any component thereof.
  • the UE 102 may report the UE capabilities 302 at least indicating whether it supports CSI-based port adaptation. Based on the received UE capabilities, the network entity 104 transmits a first control signaling 304 configuring at least one CSI report configuration including a list of CSI-RS resources with the same number of antenna ports and a codebook configuration. In some other implementations, the network entity 104 transmits a first control signaling configuring a list of CSI-RS resources with the same number of antenna ports in more than one CSI report configuration. The network entity 104 may transmit the first control signaling by RRC signaling, such as RRCReconfiguration or CSI-ReportConfig.
  • RRC signaling such as RRCReconfiguration or CSI-ReportConfig.
  • the network entity 104 may transmit a second control signaling 306, such as MAC CE or DCI, triggering the CSI-RS and/or CSI report. Then the network entity 104 may transmit the configured list of CSI-RS resource 308 for CSI measurement and report.
  • the UE 102 can determine the CSI based on one or more than one CSI-RS resources (shown at block 310a) .
  • the UE 102 transmits the CSI report 312a including at least one CSI and an indicator indicating one or more than one CSI-RS resource index (es) .
  • the UE 102 may transmit the CSI on a physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) .
  • the network entity 104 receives the CSI report including at least a CSI and an indicator indicating one or more than one CSI-RS resource index (es) (CRIs) .
  • the CRIs correspond to CRS-RS resources on various antenna ports.
  • the network entity 104 can determine which antenna ports to use for a subsequent MIMO transmission (not shown) to the UE 102.
  • the network entity 104 can update the antenna port configuration (via MAC CE or DCI) to inform the UE 102 of the selected antenna ports that will be used for the subsequent MIMO transmission (such as MIMO transmission 118 described with reference to FIG. 1) .
  • FIG. 3B illustrates an example procedure 300b for CSI measurement and reporting in which the UE reports CSI for multiple CSI-RS resource combinations corresponding to different antenna port configurations.
  • FIG. 3B shows operations of a network entity 104 and a UE 102, which may be same or similar to the network entity 104 and the UE 102, respectively, as described with reference to FIG. 1.
  • the operations of the network entity 104 can be implemented by any network entity, or any component thereof.
  • the operations of the UE 102 can be implemented by any UE, or any component thereof.
  • the UE 102 measures the CSI for multiple or all candidate CSI-RS resources combinations (shown at block 310b) .
  • Each candidate CSI-RS resource combination can include a different set of antenna ports within the configured CSI-RS resources.
  • Each reported CSI corresponds to a particular candidate CSI-RS resource combination.
  • the UE 102 transmits a CSI report (or multiple CSI reports) to indicate more than one CSI, where each CSI corresponds to a CSI-RS resources combination.
  • the network entity 104 receives the CSI report (or multiple CSI reports) and identifies the best number of ports based on the received CSIs.
  • the network entity 104 can determine the antenna ports for the subsequent downlink MIMO transmission (such as MIMO transmission 118 described with reference to FIG. 1) .
  • FIG. 4A illustrates an example procedure 400a for CSI measurement and reporting in which the network entity configures a different number of antenna ports for CSI measurement.
  • FIG. 4AA shows operations of a network entity 104 and a UE 102, which may be same or similar to the network entity 104 and the UE 102, respectively, as described with reference to FIG. 1 .
  • the operations of the network entity 104 can be implemented by any network entity, or any component thereof.
  • the operations of the UE 102 can be implemented by any UE, or any component thereof.
  • the network entity 104 transmits first control signaling 404 configuring at least a CSI report configuration including a list of CSI-RS resources with different number of antenna ports and codebook configuration.
  • the UE 102 measures the CSI based on the list of CSI-RS resources and determines the reported CSI based on one of the configured CSI-RS resources.
  • the UE might only identify one CSI-RS resource for the CSI report 412b.
  • the UE transmits the CSI report 412b including at least one CSI and an indicator indicating one CSI-RS resource index.
  • the network entity 104 receives the CSI report including at least a CSI and an indicator indicating a CSI-RS resource index. Thereafter, the network entity 104 can select an antenna port configuration based on the CSI and use the selected antenna port configuration for a subsequent MIMO transmission (such as MIMO transmission 118 described with reference to FIG. 1) .
  • FIG. 4B illustrates an example procedure 400b for CSI measurement and reporting in which the network entity configures different number of antenna ports for CSI measurement and the UE reports CSI for multiple CSI-RS resource combinations corresponding to different antenna port configurations.
  • FIG. 4B shows operations of a network entity 104 and a UE 102, which may be same or similar to the network entity 104 and the UE 102, respectively, as described with reference to FIG. 1 .
  • the operations of the network entity 104 can be implemented by any network entity, or any component thereof.
  • the operations of the UE 102 can be implemented by any UE, or any component thereof.
  • the UE 102 measures the CSI based on multiple or all configured CSI-RS resources (block 410b) , and transmits a CSI report 412b having more than one CSIs, where each CSI corresponding to a different CSI-RS resource combination.
  • the network entity 104 receives the CSI report including more than one CSIs and identifies the best number of ports based on the received CSIs.
  • the best number of ports may be the minimum quantity of ports (from among the quantities of ports for various CSI-RS resources combinations) that has a suitable quality of service and spectrum efficiency, or both.
  • the network entity can determine the antenna ports for a subsequent downlink MIMO transmission (such as MIMO transmission 118 described with reference to FIG. 1)
  • FIG. 5A illustrates an example procedure 500a for CSI measurement and reporting in which the UE reports CSI for a subset of or all the antenna ports of a CSI-RS.
  • FIG. 5A shows operations of a network entity 104 and a UE 102, which may be same or similar to the network entity 104 and the UE 102, respectively, as described with reference to FIG. 1 .
  • the operations of the network entity 104 can be implemented by any network entity, or any component thereof.
  • the operations of the UE 102 can be implemented by any UE, or any component thereof.
  • the network entity 104 configures a single CSI-RS resource and codebook configuration in the first control signaling 504, and the UE 102 can measure CSI using a subset of or all the antenna ports for the CSI-RS resource (block 510a) .
  • the UE 102 transmits the CSI report 512a including at least one CSI and an indicator indicating the measured antenna ports for the CSI.
  • the network entity 104 receives the CSI report including at least a CSI and an indicator indicating the measured antenna ports.
  • the network entity 104 can use the reported CSI and indicator to determine an antenna port configuration for a subsequent downlink MIMO transmission (such as MIMO transmission 118 described with reference to FIG. 1) .
  • FIG. 5B illustrates an example procedure 500b for CSI measurement and reporting in which the UE reports CSI for multiple antenna port groups from among the antenna ports of a CSI-RS.
  • FIG. 5B shows operations of a network entity 104 and a UE 102, which may be same or similar to the network entity 104 and the UE 102, respectively, as described with reference to FIG. 1 .
  • the operations of the network entity 104 can be implemented by any network entity, or any component thereof.
  • the operations of the UE 102 can be implemented by any UE, or any component thereof.
  • the UE 102 measures the CSI for multiple or all possible antenna port groups from the CSI-RS resource (block 510b) and transmits a CSI report 512b including more than one CSIs, where each CSI corresponds to an antenna ports group from the configured antenna ports for the CSI-RS resource.
  • the network entity 104 receives the CSI report including more than one CSIs.
  • the network entity 104 can use the reported CSIs to determine an antenna port configuration for a subsequent downlink MIMO transmission (such as MIMO transmission 118 described with reference to FIG. 1) .
  • FIG. 6 illustrates an example process 600 for a UE that supports CSI-based port adaptation.
  • the operations of the example process 600 can be implemented by a UE, or any component thereof, such as the UE 102 described with reference to FIG. 1.
  • the UE may transmit the UE capability on CSI-based port adaptation.
  • the UE receives a first control signaling configuring at least a CSI report configuration including at least a list of CSI-RS resources with the same number of antenna ports, or a list of CSI-RS resources with different number of antenna ports, or a CSI-RS resource and codebook configuration.
  • the UE may receive a second control signaling triggering the configured CSI-RS resource (s) .
  • the UE receives the configured CSI-RS resource (s) .
  • the UE measures the CSI based on the received CSI-RS resource (s) and determines a CSI report based on one or more than one CSI-RS resource (s) or a subset of or all the antenna ports from the CSI-RS resource.
  • the UE transmits the CSI report including at least a CSI, and an indicator indicating one or more than one CSI-RS resource index (es) or an indicator indicating the measured antenna ports.
  • FIG. 7 illustrates an example process 700 for a network entity that supports CSI-based port adaptation.
  • the operations of the example process 700 can be implemented by a network entity, or any component thereof, such as the network entity 104 described with reference to FIG. 1.
  • the network entity may receive the UE capability on CSI feedback for port adaptation.
  • the network entity transmits a first control signaling configuring at least a CSI report configuration including at least a list of CSI-RS resources with the same number of antenna ports, or a list of CSI-RS resources with different number of antenna ports, or a CSI-RS resource and codebook configuration.
  • the network entity may transmit a second control signaling triggering the configured CSI-RS resource (s) .
  • the network entity transmits the configured CSI-RS resource (s) .
  • the network entity receives the CSI report including at least a CSI, and an indicator indicating one or more than one CSI-RS resource index (es) or an indicator indicating the measured antenna ports.
  • the UE may transmit the UE capability on CSI-based port adaptation indicating at least one of the elements: whether the UE supports CSI-based port adaptation; the maximum number of configured CSI-RS resources for CSI-based port adaptation; the maximum number of CSI-RS resources in a slot for CSI-based port adaptation; the supported antenna ports configurations for CSI report; the supported codebook type for the CSI-based port adaptation.
  • the UE capabilities above may be counted per component carrier (CC) , across all the CCs in a band or band combination, or across all the CCs in a UE.
  • CC component carrier
  • the network entity may receive the UE capability from a UE or from a core network (such as Access and Mobility Management Function (AMF) ) or another network entity.
  • AMF Access and Mobility Management Function
  • a RRC signaling may indicate a RRC reconfiguration message from network entity to UE, or a System Information Block (SIB) , where the SIB can be an existing SIB (such as SIB1) or a new SIB (such as SIB J, where J is an integer above 21) transmitted by a network entity.
  • SIB System Information Block
  • This disclosure describes several example implementations of CSI-based port adaptation, such as the example implementations described with reference to FIG. 1, FIG. 3A, FIG. 3B, FIG. 4A, FIG. 4B, FIG. 5A, FIG. 5B, FIG. 6, and FIG. 7.
  • This disclosure includes additional detail regarding the previously described example implementations as well as several additional example implementations.
  • the various example implementations can be referred to as options.
  • Some options include various techniques as to how many CSI-RS resources configurations are sent by the network entity in CSI report configurations and how many CSIs the UE transmits in one or more CSI reports to the network entity.
  • some options relate processing various codebook configurations when considering antenna port configurations or generating port adaptation information for CSI-based port adaptation. Below is a reference list identifying the described example implementation options:
  • Option 1-1a CSI report for single CSI measurement hypothesis
  • Option 1-2a PMI report based on a Type1 single-panel codebook configuration
  • Option 1-2b PMI report based on a Type1 multi-panel codebook configuration
  • Option 1-2d PMI report based on an enhanced Type2 (eType2) codebook configuration
  • Option 3-1a CSI report for single CSI measurement hypothesis
  • Option 1 CSI report based on multiple aggregated CSI-RS resources
  • the network entity configures a list of CSI-RS resources in a CSI report configuration or multiple CSI report configuration, where the network entity configures the CSI-RS resources with the same number of antenna ports, and the CSI-RS resources share the same quasi-co-location (QCL) properties, including a subset of or all the QCL parameters: ⁇ Doppler shift, Doppler spread, average delay, delay spread, Spatial receiving (Rx) parameter, antenna gain ⁇ .
  • the network entity configures the CSI-RS resources with the same bandwidth, frequency domain density, and/or periodicity.
  • the network entity transmits the CSI-RS resources in the same slot or in more than one consecutive slot. Then the UE can measure the CSI based on aggregated CSI-RS resources.
  • Option 1-1a CSI report for single CSI measurement hypothesis
  • the UE reports the CSI based on a single CSI measurement hypothesis, i.e., a set of CSI-RS resources.
  • the UE reports the CSI including a list of CRIs indicating the selected CSI-RS resources.
  • the UE reports a bitmap indicating the selected CSI-RS resource, where value “1” for bit x may indicate the CSI-RS resource x in the configured list of CSI-RS resources is selected and value “0” for bit x may indicate the CSI-RS resource x in the configured list of CSI-RS resources is not selected.
  • the UE reports the CSI including an indicator indicating the number of selected CRIs. Then the CSI-RS resources ⁇ 1, 2, ..., K ⁇ are selected, where K indicates the reported number of selected CRIs.
  • the network entity configures the candidate CRI groups by the first control signaling or a MAC CE or DCI.
  • the network entity may configure 3 groups: ⁇ CRI 1 ⁇ , ⁇ CRI 1 and 2 ⁇ , ⁇ CRI 1, 2, 3 and 4 ⁇ .
  • the UE reports the CSI including an indicator indicating the selected CRI group index.
  • the network entity may further configure the maximum or minimum number of selected CSI-RS resources by the first control signaling.
  • the UE measures and reports at least one of the CQI, RI and LI based on the reported CSI-RS resources.
  • SE CQI is the spectrum efficiency (SE) indicated by CQI
  • N L is the number of layers indicated by RI.
  • the network entity configures a target spectrum efficiency.
  • the UE determines the reported CSI-RS resources based on the target spectrum efficiency and the number of CSI-RS resources. In one example, the UE selects the CSI-RS resources with the smallest number of total antenna ports that can produce the SE higher than or equal to the target spectrum efficiency.
  • Option 1-1b CSI report for multiple CSI measurement hypothesis
  • the UE reports multiple CSIs based on multiple CSI measurement hypothesis, where each CSI corresponds to a CSI measurement hypothesis, i.e., a set of CSI-RS resources.
  • the UE reports the CSI for different number of CSI-RS resources. In one example, if the network entity configures 4 CSI-RS resources, the UE reports 4 CSIs corresponding to 1, 2, 3, 4 CSI-RS resources respectively.
  • the network entity configures the candidate CSI-RS resources combination groups by the first control signaling, and the UE reports the CSI for each CSI-RS resource combination group.
  • the network entity may configure 3 groups: ⁇ CRI 1 ⁇ , ⁇ CRI 1 and 2 ⁇ , ⁇ CRI 1, 2, 3 and 4 ⁇ . The UE reports the 3 CSIs, and each CSI corresponds to a group.
  • the UE reports a common RI and PMI based on the candidate CSI-RS resources combination group with the largest number of CSI-RS resources.
  • the network entity can derive the PMI for other CSI-RS resources combination based on the CSI-RS resource in the combination RI and PMI.
  • the UE reports separate RI for each CSI and a common full rank PMI based on the candidate CSI-RS resources combination group with the largest number of CSI-RS resources. Then the network entity can derive the precoder for a CSI-RS resource group as a sub-matrix from the precoder indicated by the PMI based on the antenna port index (es) and the reported RI for the CSI-RS resource group.
  • the precoder indicated by the full rank PMI could be a matrix, where K is the maximum number of CSI-RS resources in a CSI-RS resource combination group, N p is the number of antenna ports per CSI-RS resource, is the maximum number of layers.
  • K is the maximum number of CSI-RS resources in a CSI-RS resource combination group
  • N p is the number of antenna ports per CSI-RS resource
  • the precoder can be the first XN p rows from the first r columns from the precoder indicated by the full rank PMI with normalization.
  • the UE reports separate RI and PMI for each CSI-RS resources combination group.
  • the UE reports absolute CSI for each CSI-RS resources combination group. In some other implementations, the UE reports absolute CSI for the CSI-RS resources combination group with the largest number of resources, and reports differential CSI for the other CSI-RS resources combination groups. In one example, the UE reports a common RI for all the CSI-RS resource groups combinations and absolute CQI for the CSI-RS resources combination group with the largest number of resources, and reports differential CQI for the other CSI-RS resources combination group with the absolute CQI as reference.
  • the network entity configures the CSI report scheme for the multi-CSI report for port adaptation by the first control signaling or the second control signaling.
  • Table 2 illustrates an example for the CSI report schemes for multi-CSI report.
  • Table 2 An example for the CSI report schemes for multi-CSI report
  • Option 1-2a PMI report based on a Type1 single-panel codebook configuration
  • the network entity configures a type1 single-panel codebook for a CSI-RS resource by the first control signaling.
  • the network entity configures the codebookConfig with the codebookType set as typeI-SinglePanel. Then the UE can measure and report the PMI based on the configured Type1 single-panel codebook based on the estimated channel from one of the CSI-RS resources or the average estimated channel from multiple CSI-RS resources. The UE can measure and report the antenna combining factor, such as co-phasing, between the CSI-RS resources.
  • the UE reports a common antenna combining factor across the CSI-RS resources.
  • the reported precoder for K reported CSI-RS resources can be as follows (formula (2) ) :
  • N p is the number of antenna ports per CSI-RS resource
  • N l is the number of layers indicated by the reported RI
  • C k is the antenna combining factor across the CSI-RS resources, which is as follows (formula (3) ) :
  • Nc may be predefined or configured by the network entity; the UE reports indicators indicating the in addition to the PMI for the CSI report.
  • the candidate value of n may be predefined or configured by the RRC signaling from the network entity. In some implementations, and the UE reports a common antenna combining factor for all layers.
  • the UE reports different antenna combining factor between different CSI-RS resources. Then the antenna combining factor C k is calculated as follows (formula (4) ) :
  • the UE reports indictors indicating the in addition to the PMI for the CSI report. In some implementations, and the UE reports a common antenna combining factor for all layers for a CSI-RS resource k.
  • the network entity configures whether the UE should report the PMI based on a common antenna combining factors between the CSI-RS resources or not by the first control signaling. In some other implementations, the network entity configures the CSI-RS resources groups that share the same antenna combining factors by the first control signaling. In one example, if the network entity configures the CSI-RS antenna ports as described with reference to FIG. 9, the network entity may configure the CSI-RS resource 1 and 2, CSI-RS resource 3 and 4 share common antenna combining factors, and CSI-RS resource 1 and 3, CSI-RS resource 2 and 4 share common antenna factors. In some implementations, the network entity may configure whether the UE reports layer-specific antenna combining factor or layer-common antenna combining factor by the first control signaling.
  • Option 1-2a-2 PMI report based on a reconstructed codebook
  • the UE reports a PMI based on a reconstructed codebook, where the UE reconstructs the codebook based on the selected CSI-RS resources and the codebook configuration for a CSI-RS resource.
  • the network entity configures the antenna port (s) index in the full antenna grid for each CSI-RS resource by the RRC signaling, and then the UE can identify the number of antenna ports in horizontal and vertical domain (N1, N2) for the aggregated CSI-RS resources.
  • the network entity configures the spatial domain multiplexing scheme for a CSI-RS resource based on a reference CSI-RS resource or for every two CSI-RS resource.
  • FIG. 8 illustrates an example antenna port configuration 800 that includes a 4-port CSI-RS resources configuration for a 16-port network entity.
  • the 4-port CSI-RS resources configuration includes a first CSI-RS Resource 802, a second CSI-RS Resource 804, a third CSI-RS Resource 806, and a fourth CSI-RS Resource 808 defined in the vertical polarity.
  • the network entity configures the CSI-RS multiplexing scheme as horizontal multiplexing for the CSI-RS resources.
  • FIG. 9 illustrates another example antenna port configuration 900 that includes a 4-port CSI-RS resources configuration for a 16-port network entity.
  • the 4-port CSI-RS resources configuration includes a first CSI-RS Resource 902, a second CSI-RS Resource 904, a third CSI-RS Resource 906, and a fourth CSI-RS Resource 908 defined in the horizontal polarity.
  • the network entity configures the number of CSI-RS resources in horizontal and the number of CSI-RS resources in vertical. Then the UE can identify the location of each CSI-RS resource in the full antenna port grid. In one example, for the CSI-RS configuration in FIG. 8, the network entity configures the number of CSI-RS resources in horizontal as 4 and number of CSI-RS resources in vertical as 1. In another example, for the CSI-RS configuration in FIG. 9, the network entity configures the number of CSI-RS resources in horizontal as 2 and number of CSI-RS resources in vertical as 2.
  • the UE can report the PMI based on the Type1 codebook with the number of antenna ports in horizontal and vertical domain (N1, N2) for the aggregated CSI-RS resources.
  • Option 1-2b PMI report based on a Type1 multi-panel codebook configuration
  • the network entity configures a Type1 multi-panel codebook for a CSI-RS resource by the first control signaling.
  • the network entity configures the codebookConfig with the codebookType set as typeI-MultiPanel. Then the UE can measure and report the PMI based on the configured Type1 multi-panel codebook based on the estimated channel from the selected CSI-RS resources. The UE determines one CSI-RS resource corresponding to a panel for the multi-panel codebook, ignores the number of panels (Ng) configured in the codebook configuration and determines the number of panels (Ng) as the number of selected CSI-RS resources. Then the UE reports the PMI based on the determined Ng, and (N1, N2) configured in the codebook configuration for the multi-panel codebook.
  • Option 1-2c PMI report based on a Type2 codebook configuration
  • the network entity configures a Type2 codebook for a CSI-RS resource by the first control signaling.
  • the network entity configures the codebookConfig with the codebookType set as type2. Then the UE can measure and report the PMI based on the configured Type2 codebook based on the estimated channel from the selected CSI-RS resources. Then the reported precoder for K reported CSI-RS resources in a subband s can be as follows (formula (5) ) :
  • W 1 is spatial domain (SD) basis, which is selected from the Type2 codebook configured by the RRC signaling from the network entity with the dimension of N p ⁇ 2L; L is the number of SD basis configured by the Type2 codebook configuration; W k, 2, s is the beam combining matrix for CSI-RS resource k in subband s with the dimension of 2L ⁇ N l ; N p is the number of antenna ports per CSI-RS resource; N l is the number of layers indicated by the reported RI.
  • SD spatial domain
  • the UE reports the CSI with PMI indicating the W1 and a subset of or all the coefficients in the matrix W 1, 2, 1 , W 2, 2, 1 , . . ., W K, 2, 1 , . . ., W 1, 2, S , W 2, 2, S , . . ., W K, 2, S , where S indicates the total number of subbands.
  • the UE only reports M strongest coefficients for each beam combining matrix, where M may be configured by the network entity or reported by the UE. In some other implementations, the UE only reports Q strongest coefficients across the beam combining matrixes, where Q may be configured by the network entity or reported by the UE. In some implementations, the UE reports an indicator that indicates the location of the reported strongest coefficients for the beam combining matrix (es) .
  • Option 1-2d PMI report based on an enhanced Type2 (eType2) codebook configuration
  • the network entity configures an enhanced Type2 (eType2) codebook for a CSI-RS resource by the first control signaling.
  • the network entity configures the codebookConfig with the codebookType set as eType2. Then the UE can measure and report the PMI based on the configured eType2 codebook based on the estimated channel from the selected CSI-RS resources.
  • the reported precoder for K reported CSI-RS resources can be as follows (formula (6) ) :
  • W 1 is spatial domain (SD) basis, which is selected from the eType2 codebook configured by the RRC signaling from the network entity with the dimension of N p ⁇ 2L;
  • L is the number of SD basis configured by the eType2 codebook configuration;
  • N p is the number of antenna ports per CSI-RS resource;
  • M v is the number of frequency domain (FD) basis;
  • W f is the FD basis with the dimension of M v ⁇ S, where the number of candidate FD basis and/or number of reported FD basis is configured by the RRC signaling from the network entity or reported by the UE.
  • the UE reports the CSI with PMI indicating the W1, a subset of or all the coefficients in the matrix and the selected FD basis W f .
  • the UE only reports M strongest coefficients for each beam combining matrix, where M may be configured by the network entity or reported by the UE.
  • the UE only reports Q strongest coefficients across the beam combining matrixes, where Q may be configured by the network entity or reported by the UE.
  • the UE reports an indicator that indicates the location of the reported strongest coefficients for the beam combining matrix (es) .
  • the reported precoder for K reported CSI-RS resources can be as follows (formula (7) ) :
  • W k, f is the FD basis corresponding to CSI-RS resource k.
  • the UE reports the CSI with PMI indicating the W1, a subset of or all the coefficients in the matrix and the selected FD basis W 1, f , W 2, f , . . ., W k, f .
  • Option 1-2e PMI report based on a set of codebook configuration
  • the network entity configures a set of codebook configurations by the first control signaling.
  • the network entity configures a set of codebookConfig in CSI-ReportConfig, where each codebook configurations correspond to a CSI-RS resource (s) combination.
  • the network entity configures a codebookConfig in more than one CSI-ReportConfig, where each codebook configurations correspond to a CSI-RS resource (s) combination in the CSI-ReportConfig. Then the UE reports the PMI based on the configured codebook corresponding to the reported CSI-RS resources combination.
  • the network entity configures the same type of codebook, such as the same codebookType, for each codebook configurations.
  • the UE may report the UE capability indicating whether it supports different codebook types for different CSI-RS resource combinations.
  • Option 2 CSI report based on CSI-RS resources with different number of ports
  • the network entity configures a list of CSI-RS resources with different number of ports in a CSI report configuration or multiple CSI report configuration, where the network entity configures the CSI-RS resources share the same quasi-co-location properties, including a subset of or all the QCL parameters: ⁇ Doppler shift, Doppler spread, average delay, delay spread, Spatial receiving (Rx) parameter, antenna gain ⁇ .
  • the key difference is that in option 2 , the UE performs a CSI measurement hypothesis based on one CSI-RS resource, and the antenna ports for the CSI-RS resources can be a subset of antenna ports from one CSI-RS resource with the largest number of antenna ports.
  • the network entity may deactivate or activate a CSI-RS resource by MAC CE or DCI.
  • FIG. 10 illustrates an example CSI-RS configuration 1000 with different number of ports.
  • the example CSI-RS configuration 1000 includes a first CSI-RS Resource 1002, a second CSI-RS Resource 1004, a third CSI-RS Resource 1006, and a fourth CSI-RS Resource 1008.
  • the first CSI-RS Resource 1002 includes 4 antennas (4 ports) ;
  • the second CSI-RS Resource 1004 includes 8 antennas (8 ports) ;
  • the third CSI-RS Resource 1006 includes 12 antennas (12 ports) ;
  • the fourth CSI-RS Resource 1008 includes 16 antennas (16 ports) .
  • FIG. 11 illustrates another example CSI-RS configuration 1110 with different number of ports. Similar to FIG. 10, the example CSI-RS configuration 1110 includes four combinations of antenna ports: a first CSI-RS Resource 1102 (4 ports using 2 antennas) , a second CSI-RS Resource 1104 (8 ports using 4 antennas) , a third CSI-RS Resource 1106 (8 ports using 4 antennas different from the 4 antennas in the second CSI-RS Resource 1104) , and a fourth CSI-RS Resource 1108 (16 ports using 8 antennas) .
  • the second CSI-RS Resource 1104 and the third CSI-RS Resource 1106 both have the same quantity of ports and antennas, the set of CSI-RS resources associated with the second CSI-RS Resource 1104 and the third CSI-RS Resource 1106 are different.
  • Option 2-1a CSI report for single CSI measurement hypothesis
  • the UE reports the CSI based on a single CSI measurement hypothesis, i.e., a single CSI-RS resource.
  • the UE transmits an indicator, such as CRI, indicating the CSI-RS resource for CSI measurement.
  • SE CQI is the spectrum efficiency indicated by CQI
  • N L is the number of layers indicated by RI.
  • the UE selects the CSI-RS resource with a smaller number of antenna ports.
  • the network entity configures a target spectrum efficiency.
  • the UE determines the reported CSI-RS resource based on the target spectrum efficiency and the number of antenna ports for the CSI-RS resource. In one example, the UE selects the CSI-RS resource with the smallest number of antenna ports that can produce the spectrum efficiency higher than the target spectrum efficiency.
  • Option 2-1b CSI report for multiple CSI measurement hypothesis
  • the UE reports multiple CSIs, where each CSI corresponds to each configured CSI-RS resource.
  • the UE reports a common RI and PMI based on the configured CSI-RS resource with the largest number of ports.
  • the network entity can derive the PMI for other CSI-RS resources based on the antenna port configuration for the CSI-RS resource and PMI.
  • the UE reports separate RI for each CSI and a common full rank PMI based on the CSI-RS resource with the largest number of antenna ports.
  • the UE reports separate RI and PMI for each CSI-RS resources combination group.
  • the UE reports absolute CSI for each configured or active CSI-RS resource. In some other implementations, the UE reports absolute CSI for the CSI-RS resource with the largest number of antenna ports, and reports differential CSI for the other CSI-RS resources. In one example, the UE reports a common RI and absolute CQI for the CSI-RS resource with the largest number of antenna ports, and reports differential CQI for the other CSI-RS resources with the absolute CQI as reference.
  • Option 2-2a PMI report based on a codebook configuration
  • the network entity configures a single codebook configuration based on one CSI-RS resource.
  • the UE measures CSI for the CSI-RS resource based on the configured codebook, and the UE measures CSI for other CSI-RS resource based on a reconstructed codebook based on the number of ports for the other CSI-RS resource and the configured codebook configuration.
  • the network entity configures the single codebook configuration based on the CSI-RS resource with the largest configured number of antenna ports.
  • the network entity configures the antenna port index (es) for a CSI-RS resource from the full antenna port configuration configured in the codebook configuration. Then the UE can reconstruct the codebook based on the antenna port index (es) and measure the PMI for the CSI-RS resource based on the reconstructed codebook.
  • the network entity configures the number of horizontal antenna ports and vertical antenna ports for each CSI-RS resource. Then the UE can reconstruct the codebook based on the configured the number of horizontal antenna ports and vertical antenna ports for the CSI-RS resource and other parameters configured in the codebook configuration, and measures the PMI based on the reconstructed codebook.
  • Option 2-2b PMI report based on multiple codebook configurations
  • the network entity configures a set of codebook configurations by the first control signaling. In one example, the network entity configures a set of codebookConfig in CSI-ReportConfig, where each codebook configurations correspond to each CSI-RS resource. In another example, the network entity configures a codebookConfig in more than one CSI-ReportConfig, where each codebook configurations correspond to each CSI-RS resource in the CSI-ReportConfig. Then the UE reports the PMI based on the configured codebook corresponding to the reported CSI-RS resource.
  • the network entity configures the same type of codebook, such as the same codebookType, for each codebook configurations.
  • the UE may report the UE capability indicating whether it supports different codebook types for different CSI-RS resource combinations.
  • Option 3 CSI report based on a single CSI-RS resource
  • the network entity configures a single CSI-RS resource in a CSI report configuration, and the UE can report CSI based on a subset of antenna ports or all antenna ports from the configured CSI-RS resource.
  • the key difference is that in option 3 , the UE performs multiple CSI measurement hypothesis based on the configured CSI-RS resource, and the UE measures the CSI measurement hypothesis based on different antenna ports from the configured CSI-RS resource.
  • the network entity may dynamically update the number of antenna ports for a CSI-RS by MAC CE or DCI.
  • FIG. 12 illustrates an example set of CSI measurement hypotheses in which the CSI measurement hypotheses are based on different antenna ports from a CSI-RS resource.
  • a first CSI-RS measurement hypothesis 1202 includes 4 antennas (4 ports) ;
  • a second CSI-RS measurement hypothesis 1204 includes 8 antennas (8 ports) ;
  • a third CSI-RS measurement hypothesis 1206 includes 12 antennas (12 ports) ;
  • a fourth CSI-RS measurement hypothesis 1208 includes 16 antennas (16 ports) .
  • FIG. 13 illustrates another example set of CSI measurement hypotheses in which the CSI measurement hypotheses are based on different antenna ports from a CSI-RS resource.
  • a first CSI-RS measurement hypothesis 1302 includes 4 antennas (4 ports) ;
  • a second CSI-RS measurement hypothesis 1304 includes 8 antennas (8 ports) ;
  • a third CSI-RS measurement hypothesis 1306 includes 8 antennas (8 ports) ;
  • a fourth CSI-RS measurement hypothesis 1308 includes 16 antennas (16 ports) .
  • a comparison between FIG. 12 and FIG. 13 shows that the CSI-RS measurement hypotheses can be different and include different quantities and selections of antenna ports.
  • Option 3-1a CSI report for single CSI measurement hypothesis
  • the UE reports the CSI based on a single CSI measurement hypothesis, i.e., CSI measured from a subset of or all the antenna port (s) for the configured CSI-RS resource.
  • the UE reports the CSI with an antenna port (s) indicator (API) indicating the measured antenna port (s) .
  • API antenna port indicator
  • FIG. 14 illustrates an example CSI measurement in which the UE measures a subset of the antenna ports for a CSI-RS resource.
  • the UE reports the API indicating the number of consecutive horizontal antenna ports N1 and number of consecutive vertical antenna ports N2.
  • the UE measures the CSI based on the N1 by N2 antenna ports.
  • the measured antenna ports 1402 are indicated by dashed lines and include a combination of two consecutive vertical antenna ports and two consecutive horizontal antenna ports.
  • FIG. 15 illustrates another example CSI measurement in which the UE measures a subset of the antenna ports for a CSI-RS resource.
  • the UE reports the API indicating the number of horizontal antenna ports N1, number of vertical antenna ports N2, the horizontal antenna ports spacing S1 and the vertical antenna ports spacing S2.
  • the UE reports the measured antenna port index (es) in the CSI report, and the UE measures the CSI from the reported antenna port index (es) .
  • the network entity configures the candidate measured antenna ports group (s) for the CSI report.
  • the candidate measured antenna ports group (s) for an antenna structure configured in the codebook configuration could be predefined.
  • the UE reports the API indicating one of the configured measured antenna ports groups.
  • SE CQI is the spectrum efficiency indicated by CQI
  • N L is the number of layers indicated by RI.
  • the UE selects the CSI-RS resource with a smaller number of antenna ports.
  • the network entity configures a target spectrum efficiency.
  • the UE determines the API based on the target spectrum efficiency. In one example, the UE selects the smallest number of antenna ports that can produce the spectrum efficiency higher than the target spectrum efficiency.
  • Option 3-1b CSI report for multiple CSI measurement hypothesis
  • the UE reports multiple CSIs, where each CSI corresponds to an antenna port configuration.
  • the network entity configures the candidate measured antenna ports group (s) for the CSI report.
  • the candidate measured antenna ports group (s) for an antenna structure configured in the codebook configuration could be predefined.
  • the UE reports the CSIs for all the candidate measured antenna ports group (s) .
  • the UE reports a common RI and PMI based on the antenna ports group with the largest number of antenna ports.
  • the network entity can derive the PMI for smaller number of antenna ports group based on the antenna ports index and the reported PMI.
  • the UE reports separate RI for each CSI and a common full rank PMI based on the antenna ports group with the largest number of antenna ports.
  • the UE reports separate RI and PMI for each antenna ports group.
  • the UE reports absolute CSI for each antenna ports group. In some other implementations, the UE reports absolute CSI for the antenna ports group with the largest number of antenna ports, and reports differential CSI for the other antenna ports group. In one example, the UE reports a common RI and absolute CQI for the antenna ports group with the largest number of antenna ports, and reports differential CQI for the other antenna ports group with the absolute CQI as reference.
  • Option 3-2a PMI report based on a codebook configuration
  • the network entity configures a single codebook configuration based on one antenna ports group.
  • the UE measures CSI corresponding to an API based on the antenna ports indicated by the API and other parameters in the codebook configuration.
  • Option 3-2b PMI report based on multiple codebook configurations
  • the network entity configures a set of codebook configurations by the first control signaling.
  • the network entity configures a set of codebookConfig in CSI-ReportConfig, where each codebook configurations correspond to a candidate antenna ports group.
  • the network entity configures a codebookConfig in more than one CSI-ReportConfig, where each codebook configurations correspond to each CSI-RS resource in the CSI-ReportConfig. Then the UE reports the PMI based on the configured codebook corresponding to the reported CSI-RS resource.
  • the network entity configures the same type of codebook, such as the same codebookType, for each codebook configurations.
  • the UE may report the UE capability indicating whether it supports different codebook types for different CSI-RS resource combinations.
  • FIGs. 1 to 15 and the operations described herein are examples meant to aid in understanding example implementations and should not be used to limit the potential implementations or limit the scope of the claims. Some implementations might include additional operations, fewer operations, operations in parallel or in a different order, and some operations differently.
  • a method for wireless communication at a User Equipment including: receiving, via control signaling from a network entity, one or more channel state information (CSI) report configurations that indicate at least one CSI reference signal (CSI-RS) resource and that configures one or more CSI reports to include port adaptation information; receiving the at least one CSI-RS resource; and transmitting the one or more CSI reports with the port adaptation information based on measurements of the at least one CSI-RS resource, where the port adaptation information indicates at least one antenna port configuration and a respective CSI for the at least one antenna port configuration.
  • CSI channel state information
  • Clause 2 The method of clause 1, further including: transmitting a UE capability message to the network entity, where the UE capability message indicates one or more of the following elements: an indication that the UE supports generation of the port adaptation information, a maximum number of configured CSI-RS resources that the UE can support for port adaptation, a maximum number of CSI-RS resources in a slot that the UE can support for port adaptation, a list of supported antenna port configurations for CSI reporting, an indication of supported codebook type or types, or a maximum quantity of supported codebook configurations.
  • Clause 3 The method of clause 1, where the control signaling indicates a plurality of CSI-RS resources, the method further including: measuring the plurality of CSI-RS resources using a plurality of candidate antenna port configurations; and transmitting a first CSI report of the one or more CSI reports, where the first CSI report includes a first CSI for a first antenna port configuration of the plurality of candidate antenna port configurations, and where the first CSI report further includes port adaptation information indicating the first antenna port configuration.
  • Clause 4 The method of clause 2, further including: receiving, via the control signaling, a list indicating the plurality of candidate antenna port configurations.
  • Clause 5 The method of any one of clauses 2-4, further including: selecting the first antenna port configuration from among the plurality of antenna port configurations based on CSI measurements corresponding to the plurality of antenna port configurations, where the first antenna port configuration satisfies a target spectrum efficiency with a lowest number of a total antenna ports from among the plurality of antenna port configurations.
  • Clause 6 The method of any one of clauses 3-5, further including: transmitting at least a second CSI report of the one or more CSI reports, where the second CSI report indicates a second antenna port configuration of the plurality of antenna port configurations and includes a second CSI for the second antenna port configuration.
  • Clause 7 The method of clause 1, where the CSI report configuration indicates a single CSI-RS resource, the method further including: measuring the single CSI-RS resource using more than one antenna port; and transmitting at least a first CSI report of the one or more CSI reports, where the first CSI report includes a first CSI for a first set of antenna ports, and where the first CSI report includes an antenna port indicator (API) indicating the first set of antenna ports.
  • API antenna port indicator
  • Clause 8 The method of clause 7, where the first CSI report includes port adaptation information that indicates a list of the measured antenna ports.
  • Clause 9 The method of any one of clauses 7-8, where the first CSI report includes an antenna port configuration indicating: a number of consecutive horizontal antenna ports and a number of consecutive vertical antenna ports; or a number of horizontal antenna ports, a number of vertical antenna ports, horizontal antenna ports spacing, and vertical antenna ports spacing.
  • Clause 10 The method of any one of clauses 1-8, where the one or more CSI reports include a plurality of CSI corresponding to a plurality of antenna port configurations, and where the one or more CSI reports include information indicative of rank indicator (RI) , precoding matrix indicator (PMI) and channel quality indicator (CQI) .
  • RI rank indicator
  • PMI precoding matrix indicator
  • CQI channel quality indicator
  • Clause 11 The method of clause 10, further including: transmitting the plurality of CSI in separate CSI reports, each CSI report indicating the CSI for a particular antenna port configuration.
  • Clause 12 The method of clause 10, further including: transmitting the plurality of CSI in a common CSI report that includes CSI for each of the plurality of antenna port configurations.
  • Clause 13 The method of any one of clauses 10-12, where the information indicative of RI, PMI, and CQI includes: separate RI, PMI and CQI values for each antenna port configuration of the plurality of antenna port configurations; a common RI and PMI value based on a first antenna port configuration with a largest number of ports and separate CQI for each antenna port configuration of the plurality of antenna port configurations; an absolute CQI for the first antenna port configuration and differential CQI for each of the other antenna port configurations using the absolute CQI as reference; or a common full rank PMI based on the first antenna port configuration and separate RI and CQI for each antenna port configuration of the plurality of antenna port configurations.
  • Clause 14 The method of clause 12, further including: receiving, via the control signaling, information configuring a same number of antenna ports in different antenna port configurations for the at least one CSI-RS resource.
  • Clause 15 The method of clause 14, further including: transmitting an indicator indicating one or more CSI-RS resource indicators (CRIs) and other CSI measured from a subset of the at least one CSI-RS resource indicated by the one or more CRIs.
  • CRIs CSI-RS resource indicators
  • Clause 16 The method of clause 13, further including: receiving, via the control signaling, information configuring one or more CSI-RS resource groups for CSI measurement; and transmitting at least a first CSI measured from at least a first CSI-RS resource group of the one or more CSI-RS resource groups and an indicator indicating a first CSI-RS resource group index identifying the first CSI-RS resource group.
  • Clause 17 The method of clause 16, further including transmitting multiple CSIs, where each CSI of the multiple CSIs corresponds to a particular CSI-RS resource group of the one or more CSI-RS resource groups.
  • Clause 18 The method of any one of clauses 1-16, further including: receiving, via the control signaling, information configuring at least one codebook based on a number of ports configured for the at least one CSI-RS resource.
  • Clause 19 The method of clause 18, further including: transmitting a PMI for a CSI-RS resource group based on an antenna ports configuration in the at least one codebook and at least one indicator indicating the antenna combining factor across the CSI-RS resources in the at least one CSI-RS resource group.
  • Clause 20 The method of clause 18, further including: transmitting a PMI for a CSI-RS resource group based on each of a plurality of antenna ports configuration for the at least one CSI-RS resource.
  • Clause 21 The method of any one of clauses 18-20, where the at least one codebook includes: a Type1 single-panel codebook, a Type1 multi-panel codebook, a Type2 codebook, an eType2 codebook, or a set of codebooks.
  • Clause 22 The method of any one of clauses 18-21, further including: transmitting a PMI for a CSI-RS resource group indicating common spatial domain basis and separate beam combining matrix for each subband for each CSI-RS resources in the CSI-RS resource group; transmitting the PMI for the CSI-RS resource group indicating common spatial domain basis, common frequency domain basis, and separate beam combining matrix for each CSI-RS resources in the CSI-RS resource group; transmitting the PMI for the CSI-RS resource group indicating common spatial domain basis, separate frequency domain basis, and separate beam combining matrix for each CSI-RS resources in the CSI-RS resource group; or transmitting the PMI for the CSI-RS resource group based on a first codebook configuration of a set of codebooks, the first codebook configuration corresponding to the CSI-RS resource group.
  • a method for wireless communication at a network entity including: transmitting, via first control signaling to a user equipment (UE) , one or more channel state information (CSI) report configurations that indicate at least one CSI reference signal (CSI-RS) resource and that configures one or more CSI reports to include port adaptation information; transmitting the at least one CSI-RS resource; receiving the one or more CSI reports with the port adaptation information, where the port adaptation information indicates at least one antenna port configuration and a respective CSI for the at least one antenna port configuration.
  • CSI channel state information
  • Clause 24 The method of clause 23, further including: configuring a first antenna port configuration for subsequent Multiple-Input-Multiple-Output (MIMO) transmissions to the UE based, at least in part, on the port adaptation information.
  • MIMO Multiple-Input-Multiple-Output
  • Clause 25 An apparatus, including: a communication unit; and a processing system configured to control the communication unit to implement the methods of any one of clauses 1 to 24.
  • An apparatus including a processer configured to cause a User Equipment (UE) to: receive a control signaling configuring at least one CSI reference signal (CSI-RS) resource for CSI feedback for port adaptation, at least one CSI measurement from fewer or more antenna ports than the configured antenna ports for the CSI-RS, and at least one codebook for CSI feedback for port adaptation; receive the configured at least one CSI-RS resource; and transmit a CSI report based on the received at least one CSI-RS resource including at least a CSI measured from fewer or more antenna ports than the configured antenna ports for the at least one CSI-RS resource.
  • CSI-RS CSI reference signal
  • UE transmits the UE capability indicating at least one of the elements: whether the UE supports CSI report for port adaptation; the maximum number of configured CSI-RS resources for CSI report for port adaptation; the maximum number of CSI-RS resources in a slot for CSI report for port adaptation; the supported antenna ports structures; the supported codebook type for the CSI report for port adaptation.
  • Clause 28 The apparatus according to clause 26, where the UE transmits an indicator indicating the measured antenna port (s) .
  • Clause 29 The apparatus according to clause 28, where the UE transmits the indicator indicating the number of consecutive horizontal antenna ports and number of consecutive vertical antenna ports for the reported CSI.
  • Clause 30 The apparatus according to clause 28, where the UE transmits the indicator indicating the number of horizontal antenna ports, number of vertical antenna ports, the horizontal antenna ports spacing and the vertical antenna ports spacing.
  • Clause 31 The apparatus according to clause 26, where the UE receives a control signaling configuring the candidate antenna ports groups for CSI measurement.
  • Clause 32 The apparatus according to clause 28 and clause 31, where the UE transmits the indicator indicating one of the configured antenna ports groups for the reported CSI.
  • Clause 33 The apparatus according to clause 31, where the UE transmits more than one CSIs, where each CSI corresponds to each configured antenna ports group.
  • Clause 35 The apparatus according to clause 33, where the UE transmits a common RI and PMI based on the antenna ports group with largest number of ports, and separate CQI for each antenna ports group.
  • Clause 36 The apparatus according to clause 35, where the UE transmits absolute CQI for the antenna ports group with largest number of ports and differential CQI for the other antenna ports group with the absolute CQI as reference.
  • Clause 37 The apparatus according to clause 33, where the UE transmits a common full rank PMI based on the antenna ports group with largest number of ports and separate RI and CQI for each antenna ports group.
  • Clause 38 The apparatus according to clause 26, where the UE receives the control signaling configuring more than one CSI-RS resource.
  • Clause 39 The apparatus according to clause 38, where the UE receives the control signaling configuring the same number of antenna ports for the CSI-RS resources.
  • Clause 40 The apparatus according to clause 39, where the UE transmits an indicator indicating one or more than one CSI-RS resource indicator (CRI) and other CSI measured from the CSI-RS resources indicated by the CRI (s) .
  • CRI CSI-RS resource indicator
  • Clause 41 The apparatus according to clause 39, where the UE receives a control signaling configuring the CSI-RS resource group (s) for CSI measurement.
  • Clause 42 The apparatus according to clause 41, where the UE transmits a CSI measured from one of the CSI-RS resource groups and an indicator indicating the CSI-RS resource group index.
  • Clause 43 The apparatus according to clause 41, where the UE transmits multiple CSIs, where each CSI is measured from each CSI-RS resource group.
  • Clause 44 The apparatus according to clause 40 to clause 43, where the UE receives a control signaling configuring a Type1 single-panel codebook based on the number of ports configured for one of the configured CSI-RS resources.
  • Clause 45 The apparatus according to clause 44, where the UE transmits a PMI for a CSI-RS resource group based on the antenna ports configuration in the codebook and at least one indicator indicating the antenna combining factor across the CSI-RS resources in the CSI-RS resource group.
  • Clause 46 The apparatus according to clause 44, where the UE transmits a PMI for a CSI-RS resource group based on the antenna ports configuration for the CSI-RS resources in the CSI-RS resource group.
  • Clause 47 The apparatus according to clause 40 to clause 43, where the UE receives a control signaling configuring a Type1 multi-panel codebook based on the number of ports configured for one of the configured CSI-RS resources.
  • Clause 48 The apparatus according to clause 47, where the UE transmits a PMI for a CSI-RS resource group based on the antenna ports configuration in the codebook and the number of CSI-RS resources in the CSI-RS resource group.
  • Clause 49 The apparatus according to clause 40 to clause 43, where the UE receives a control signaling configuring a Type2 codebook based on the number of ports configured for one of the configured CSI-RS resources.
  • Clause 50 The apparatus according to clause 49, where the UE transmits a PMI for a CSI-RS resource group indicating common spatial domain basis and separate beam combining matrix for each subband for each CSI-RS resources in the CSI-RS resource group.
  • Clause 51 The apparatus according to clause 40 to clause 43, where the UE receives a control signaling configuring an eType2 codebook based on the number of ports configured for one of the configured CSI-RS resources.
  • Clause 52 The apparatus according to clause 49, where the UE transmits a PMI for a CSI-RS resource group indicating common spatial domain basis, common frequency domain basis, and separate beam combining matrix for each CSI-RS resource in the CSI-RS resource group.
  • Clause 53 The apparatus according to clause 49, where the UE transmits a PMI for a CSI-RS resource group indicating common spatial domain basis, separate frequency domain basis, and separate beam combining matrix for each CSI-RS resources in the CSI-RS resource group.
  • Clause 54 The apparatus according to clause 40 to clause 43, where the UE receives a control signaling configuring a set of codebook configurations, where each codebook corresponds to each CSI-RS resource group.
  • Clause 55 The apparatus according to clause 54, where the UE transmits a PMI for a CSI-RS resource group based on the codebook configuration corresponding to the CSI-RS resource group.
  • Clause 56 The apparatus according to clause 38, where the UE receives the control signaling configuring the different number of antenna ports for the CSI-RS resources.
  • Clause 57 The apparatus according to clause 56, where the UE transmits an indicator indicating one of the configured CSI-RS resources and CSI measured from the indicated CSI-RS resource.
  • Clause 58 The apparatus according to clause 56, where the UE transmits multiple CSIs, where each CSI corresponds to a CSI-RS resource.
  • Clause 59 The apparatus according to clause 56, where the UE receives a control signaling configuring a codebook configuration.
  • Clause 60 The apparatus according to clause 59, where the UE transmits the PMI for a CSI-RS resource based on the antenna ports configuration for the CSI-RS and the configured codebook.
  • Clause 61 The apparatus according to clause 56, where the UE receives a control signaling configuring a set of codebook configurations, where each codebook corresponds to each configured CSI-RS resource.
  • Clause 62 The apparatus according to clause 61, where the UE transmits a PMI for a CSI-RS resource based on the codebook configuration corresponding to the CSI-RS resource.
  • An apparatus including a processer configured to cause a network entity to: transmit a control signaling configuring at least one CSI reference signal (CSI-RS) resource for CSI feedback for port adaptation, at least one CSI measurement from fewer or more antenna ports than the configured antenna ports for the CSI-RS, and at least one codebook for CSI feedback for port adaptation; transmit the configured at least one CSI-RS resource; receive a CSI report including at least a CSI measured from fewer or more antenna ports than the configured antenna ports for the at least one CSI-RS resource.
  • CSI-RS CSI reference signal
  • Clause 64 The apparatus according to clause 63, where BS receives the UE capability indicating at least one of the elements: whether the UE supports CSI report for port adaptation; the maximum number of configured CSI-RS resources for CSI report for port adaptation; the maximum number of CSI-RS resources in a slot for CSI report for port adaptation; the supported antenna ports structures; the supported codebook type for the CSI report for port adaptation.
  • Clause 65 The apparatus according to clause 63, where the BS receives an indicator indicating the measured antenna port (s) .
  • Clause 66 The apparatus according to clause 65, where the BS receives the indicator indicating the number of consecutive horizontal antenna ports and number of consecutive vertical antenna ports for the reported CSI.
  • Clause 67 The apparatus according to clause 65, where the BS receives the indicator indicating the number of horizontal antenna ports, number of vertical antenna ports, the horizontal antenna ports spacing and the vertical antenna ports spacing.
  • Clause 68 The apparatus according to clause 63, where the BS transmits a control signaling configuring the candidate antenna ports groups for CSI measurement.
  • Clause 69 The apparatus according to clause 65 and clause 68, where the BS receives the indicator indicating one of the configured antenna ports groups for the reported CSI.
  • Clause 70 The apparatus according to clause 68, where the BS receives more than one CSIs, where each CSI corresponds to each configured antenna ports group.
  • Clause 71 The apparatus according to clause 70, where the BS receives separate rank indicator (RI) , precoder matrix indicator (PMI) and channel quality indicator (CQI) for each configured antenna ports group.
  • RI rank indicator
  • PMI precoder matrix indicator
  • CQI channel quality indicator
  • Clause 72 The apparatus according to clause 70, where the BS receives a common RI and PMI based on the antenna ports group with largest number of ports, and separate CQI for each antenna ports group.
  • Clause 73 The apparatus according to clause 72, where the BS receives absolute CQI for the antenna ports group with largest number of ports and differential CQI for the other antenna ports group with the absolute CQI as reference.
  • Clause 74 The apparatus according to clause 70, where the BS receives a common full rank PMI based on the antenna ports group with largest number of ports and separate RI and CQI for each antenna ports group.
  • Clause 75 The apparatus according to clause 63, where the BS transmits the control signaling configuring more than one CSI-RS resources.
  • Clause 76 The apparatus according to clause 75, where the BS transmits the control signaling configuring the same number of antenna ports for the CSI-RS resources.
  • Clause 77 The apparatus according to clause 76, where the BS receives an indicator indicating one or more than one CSI-RS resource indicator (CRI) and other CSI measured from the CSI-RS resources indicated by the CRI (s) .
  • CRI CSI-RS resource indicator
  • Clause 78 The apparatus according to clause 76, where the BS transmits a control signaling configuring the CSI-RS resource group (s) for CSI measurement.
  • Clause 79 The apparatus according to clause 78, where the UE transmits a CSI measured from one of the CSI-RS resource groups and an indicator indicating the CSI-RS resource group index.
  • Clause 80 The apparatus according to clause 78, where the BS receives multiple CSIs, where each CSI is measured from each CSI-RS resource groups.
  • Clause 81 The apparatus according to clause 77 to clause 80, where the BS transmits a control signaling configuring a Type1 single-panel codebook based on the number of ports configured for one of the configured CSI-RS resources.
  • Clause 82 The apparatus according to clause 81, where the BS receives a PMI for a CSI-RS resource group based on the antenna ports configuration in the codebook and at least one indicator indicating the antenna combining factor across the CSI-RS resources in the CSI-RS resource group.
  • Clause 83 The apparatus according to clause 81, where the BS receives a PMI for a CSI-RS resource group based on the antenna ports configuration for the CSI-RS resources in the CSI-RS resource group.
  • Clause 84 The apparatus according to clause 77 to clause 80, where the BS transmits a control signaling configuring a Type1 multi-panel codebook based on the number of ports configured for one of the configured CSI-RS resources.
  • Clause 85 The apparatus according to clause 84, where the BS receives a PMI for a CSI-RS resource group based on the antenna ports configuration in the codebook and the number of CSI-RS resources in the CSI-RS resource group.
  • Clause 86 The apparatus according to clause 77 to clause 80, where the BS transmits a control signaling configuring a Type2 codebook based on the number of ports configured for one of the configured CSI-RS resources.
  • Clause 87 The apparatus according to clause 86, where the BS receives a PMI for a CSI-RS resource group indicating common spatial domain basis and separate beam combining matrix for each subband for each CSI-RS resources in the CSI-RS resource group.
  • Clause 88 The apparatus according to clause 77 to clause 80, where the BS transmits a control signaling configuring an eType2 codebook based on the number of ports configured for one of the configured CSI-RS resources.
  • Clause 89 The apparatus according to clause 86, where the BS receives a PMI for a CSI-RS resource group indicating common spatial domain basis, common frequency domain basis, and separate beam combining matrix for each CSI-RS resources in the CSI-RS resource group.
  • Clause 90 The apparatus according to clause 86, where the BS receives a PMI for a CSI-RS resource group indicating common spatial domain basis, separate frequency domain basis, and separate beam combining matrix for each CSI-RS resources in the CSI-RS resource group.
  • Clause 91 The apparatus according to clause 77 to clause 80, where the BS transmits a control signaling configuring a set of codebook configurations, where each codebook corresponds to each CSI-RS resource group.
  • Clause 92 The apparatus according to clause 91, where the BS receives a PMI for a CSI-RS resource group based on the codebook configuration corresponding to the CSI-RS resource group.
  • Clause 93 The apparatus according to clause 75, where the BS transmits the control signaling configuring the different number of antenna ports for the CSI-RS resources.
  • Clause 94 The apparatus according to clause 93, where the BS receives an indicator indicating one of the configured CSI-RS resources and CSI measured from the indicated CSI-RS resource.
  • Clause 95 The apparatus according to clause 93, where the BS receives multiple CSIs, where each CSI corresponds to a CSI-RS resource.
  • Clause 96 The apparatus according to clause 93, where the BS transmits a control signaling configuring a codebook configuration.
  • Clause 97 The apparatus according to clause 96, where the BS receives the PMI for a CSI-RS resource based on the antenna ports configuration for the CSI-RS and the configured codebook.
  • Clause 98 The apparatus according to clause 93, where the BS transmits a control signaling configuring a set of codebook configurations, where each codebook corresponds to each configured CSI-RS resource.
  • Clause 99 The apparatus according to clause 98, where the BS receives a PMI for a CSI-RS resource based on the codebook configuration corresponding to the CSI-RS resource.
  • the wireless communication device may include at least one interface and a processing system communicatively coupled with the at least one interface.
  • the processing system may be configured to implement any one of the above clauses.
  • a portable electronic device comprising a wireless communication device, a plurality of antennas coupled to the at least one transceiver to wirelessly transmit signals output from the at least one transceiver and a housing that encompasses the wireless communication device, the at least one transceiver and at least a portion of the plurality of antennas.
  • the wireless communication device may include at least one interface and a processing system communicatively coupled with the at least one interface.
  • the processing system may be configured to implement any one of the above clauses.
  • Another innovative aspect of the subject matter described in this disclosure can be implemented as a machine-readable medium having processor-readable instructions stored therein that, when executed by a processing system of a UE, cause the UE to implement any one of the above clauses.
  • the apparatus may include means for implementing any one of the above clauses.
  • the term “component” is intended to be broadly construed as hardware, firmware, or a combination of hardware and software.
  • a processor is implemented in hardware, firmware, or a combination of hardware and software.
  • the phrase “based on” is intended to be broadly construed to mean “based at least in part on. ”
  • satisfying a threshold may refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, or the like.
  • a phrase referring to “at least one of” or “one or more of” a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover the possibilities of: a only, b only, c only, a combination of a and b, a combination of a and c, a combination of b and c, and a combination of a and b and c.
  • the term “can” indicates a capability, or alternatively indicates a possible implementation option.
  • the term “may” indicates a permission or a possible implementation option.
  • the hardware and data processing apparatus used to implement the various illustrative components, logics, logical blocks, modules and circuits described in connection with the aspects disclosed herein may be implemented or performed with a general purpose single-or multi-chip processor, a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a field programmable gate array (FPGA) or other programmable logic device (PLD) , discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • PLD programmable logic device
  • a general-purpose processor may be a microprocessor, or any conventional processor, controller, microcontroller, or state machine.
  • a processor also may be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • particular processes, operations and methods may be performed by circuitry that is specific to a given function.
  • implementations of the subject matter described in this specification can be implemented as software.
  • various functions of components disclosed herein, or various blocks or steps of a method, operation, process or algorithm disclosed herein can be implemented as one or more modules of one or more computer programs.
  • Such computer programs can include non-transitory processor-or computer-executable instructions encoded on one or more tangible processor-or computer-readable storage media for execution by, or to control the operation of, data processing apparatus including the components of the devices described herein.
  • storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to store program code in the form of instructions or data structures. Combinations of the above should also be included within the scope of storage media.
  • the terms “user equipment” , “wireless communication device” , “mobile communication device” , “communication device” , or “mobile device” refer to any one or all of cellular telephones, smartphones, portable computing devices, personal or mobile multi-media players, laptop computers, tablet computers, smartbooks, Internet-of-Things (IoT) devices, palm-top computers, wireless electronic mail receivers, multimedia Internet enabled cellular telephones, wireless gaming controllers, display sub-systems, driver assistance systems, vehicle controllers, vehicle system controllers, vehicle communication system, infotainment systems, vehicle telematics systems or subsystems, vehicle display systems or subsystems, vehicle data controllers or routers, and similar electronic devices which include a programmable processor and memory and circuitry configured to perform operations as described herein.
  • IoT Internet-of-Things
  • drawings may schematically depict one or more example processes in the form of a flowchart or flow diagram. However, other operations that are not depicted can be incorporated in the example processes that are schematically illustrated. For example, one or more additional operations can be performed before, after, simultaneously, or between any of the illustrated operations. In some circumstances, multitasking and parallel processing may be advantageous.

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Abstract

Cette divulgation permet une adaptation de port aux fins d'une communication à entrées multiples et à sorties multiples (MIMO) sur la base de conditions de canal. Une entité de réseau (104) peut transmettre une ou plusieurs ressources de signal de référence d'informations d'état de canal (CSI) (CSI-RS) à un UE (102). L'UE peut mesurer (112) la ou les ressources CSI-RS et transmettre un ou plusieurs rapports de CSI (114) comprenant des informations d'adaptation de port (116) indiquant des CSI pour une ou plusieurs configurations de port d'antenne. Une configuration de port d'antenne peut se référer à la quantité de ports d'antenne, à une polarité et à un indicateur de matrice de précodage (PMI). Selon certains aspects, l'UE rapporte les CSI pour une configuration de port d'antenne sélectionnée par l'UE comprenant moins ou plus de ports d'antenne que celle configurée pour la ressource CSI-RS. Selon certains aspects, l'UE rapporte des CSI pour une pluralité de configurations de port d'antenne pour permettre à l'entité de réseau de sélectionner une configuration de port d'antenne sur la base des CSI rapportées.
EP23713281.6A 2023-02-22 2023-02-22 Retour de csi aux fins d'une adaptation de port Pending EP4652680A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2827023T3 (es) * 2015-06-17 2021-05-19 Lg Electronics Inc Notificación de CSI aperiódica eficiente
US10778310B2 (en) * 2015-08-25 2020-09-15 Lg Electronics Inc. Method for transmitting or receiving channel state information in wireless communication system and device therefor
US10536206B2 (en) * 2015-12-17 2020-01-14 Lg Electronics Inc. Method for transmitting and receiving channel state information in wireless communication system and apparatus therefor
WO2018231997A1 (fr) * 2017-06-16 2018-12-20 Intel Corporation Concaténation d'informations d'état de canal et mesure de port d'antenne
KR102664932B1 (ko) * 2018-09-03 2024-05-10 삼성전자주식회사 무선통신 시스템에서 단말 안테나 설정 방법 및 장치
EP4094374B1 (fr) * 2020-01-23 2024-10-30 Qualcomm Incorporated Rétroaction d'indicateur de matrice de précodage pour plusieurs hypothèses de transmission

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