WO2022033654A1 - Aperiodic channel state information reporting - Google Patents

Aperiodic channel state information reporting Download PDF

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Publication number
WO2022033654A1
WO2022033654A1 PCT/EP2020/072351 EP2020072351W WO2022033654A1 WO 2022033654 A1 WO2022033654 A1 WO 2022033654A1 EP 2020072351 W EP2020072351 W EP 2020072351W WO 2022033654 A1 WO2022033654 A1 WO 2022033654A1
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WO
WIPO (PCT)
Prior art keywords
transmission
state information
channel state
reception point
report
Prior art date
Application number
PCT/EP2020/072351
Other languages
French (fr)
Inventor
Salah Eddine HAJRI
Youngsoo Yuk
Keeth Saliya Jayasinghe LADDU
Rana Ahmed Salem
Marco MASO
Filippo Tosato
Original Assignee
Nokia Technologies Oy
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 Nokia Technologies Oy filed Critical Nokia Technologies Oy
Priority to PCT/EP2020/072351 priority Critical patent/WO2022033654A1/en
Publication of WO2022033654A1 publication Critical patent/WO2022033654A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

Definitions

  • the present disclosure relates to an apparatus, a method, and a computer program and in particular but not exclusively for an apparatus, methods and computer programs for use in a wireless communication system involving reporting channel state information.
  • a wireless communication system may involve a communication device reporting channel state information about one or more channels between one or more transmission points and the device.
  • a method comprising: transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
  • the first channel state information report configuration may specify report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, wherein one or more report quantities for the first transmission/reception point are distinguishable from one or more report quantities for the second transmission/reception point.
  • the one or more report quantities for the first transmission/reception point may be distinguishable from the one or more report quantities for the second transmission/reception point by a control resource set pool index value or an explicit transmission/reception point indicator.
  • the first channel state information report configuration may comprise quasi co-location assumptions for channel measurement resources for at least both the first and second transmission/reception points.
  • the method may further comprise: transmitting information indicating one or more validity time periods for channel state information measurements triggered by a channel state information request indexing the first channel state information report configuration.
  • a method comprising: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point, and selectively including the determined values in a channel state information report to the first transmission/reception point.
  • Selectively determining values for the report quantities for the first transmission/reception point may comprise: identifying from the channel state information report configuration one or more report quantities for the first transmission/reception point and identifying from the channel state information report configuration one or more quasi co-location assumptions for the channel measurement resources for the first transmission/reception point; and computing values for the report quantities identified for the first transmission/reception point based on the one or more quasi co-location assumptions identified for the first transmission/reception point.
  • Identifying one or more report quantities for the first transmission/reception point and identifying one or more quasi co-location assumptions for the channel measurement resources for the first transmission/reception point may comprise selecting one or more report quantities and one or more quasi co-location assumptions that are marked in the channel state information report configuration by a radio resource index value specific to the first transmission/reception point, wherein the radio resource index value is mappable onto the downlink control channel via which the channel state information request is received.
  • the radio resource index value specific to the first transmission/reception point may comprise a control resource set pool index value.
  • the method may further comprise: performing measurements for computing values for all report quantities specified in the channel state information report configuration.
  • the method may further comprise: storing measurement results for use in later computing values for the report quantities for one or more transmission/reception points other than the first transmission/reception point.
  • a method comprising: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance: performing measurements for computing the one or more first quantities and the one or more second quantities; storing measurement results at least for use in later computing values for the one or more second report quantities.
  • the method may further comprise: preparing a channel state information report for the transmission/reception point based at least partly on the stored measurement results, based on a determination that one or more of the stored measurement results remain valid for the channel state information report to the transmission/reception point.
  • a method comprising: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
  • Preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration may be based on a determination that the one or more results of the one or more measurements remain valid for the channel state information report for the second transmission/reception point.
  • Preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration may be based on a determination that the length of time between receiving the channel state information request from the first transmission/reception point and receiving the channel state information request from the second transmission/reception point does not exceed a threshold value.
  • the method may further comprise: making one or more signal measurements in response to receiving the channel state information request from the second transmission/reception point; and wherein preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration is based on a determination that the length of time between making signal measurements in response to the receiving the channel state information request from the first transmission/reception point and making signal measurements in response to receiving the channel state information request from the second transmission/reception point does not exceed a threshold value.
  • An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus to perform: transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
  • the first channel state information report configuration may specify report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, wherein one or more report quantities for the first transmission/reception point are distinguishable from one or more report quantities for the second transmission/reception point.
  • the one or more report quantities for the first transmission/reception point may be distinguishable from the one or more report quantities for the second transmission/reception point by a control resource set pool index value or an explicit transmission/reception point indicator.
  • the first channel state information report configuration may comprise quasi co-location assumptions for channel measurement resources for at least both the first and second transmission/reception points.
  • the at least one memory and computer program code may be further configured to, with the at least one processor, cause the apparatus to perform: transmitting information indicating one or more validity time periods for channel state information measurements triggered by a channel state information request indexing the first channel state information report configuration.
  • An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus to perform: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point, and selectively including the determined values in a channel state information report to the first transmission/reception point.
  • Selectively determining values for the report quantities for the first transmission/reception point may comprise: identifying from the channel state information report configuration one or more report quantities for the first transmission/reception point and identifying from the channel state information report configuration one or more quasi co-location assumptions for the channel measurement resources for the first transmission/reception point; and computing values for the report quantities identified for the first transmission/reception point based on the one or more quasi co-location assumptions identified for the first transmission/reception point.
  • Identifying one or more report quantities for the first transmission/reception point and identifying one or more quasi co-location assumptions for the channel measurement resources for the first transmission/reception point may comprise selecting one or more report quantities and one or more quasi co-location assumptions that are marked in the channel state information report configuration by a radio resource index value specific to the first transmission/reception point, wherein the radio resource index value is mappable onto the downlink control channel via which the channel state information request is received.
  • the radio resource index value specific to the first transmission/reception point may comprise a control resource set pool index value.
  • the at least one memory and computer program code may be further configured to, with the at least one processor, cause the apparatus to perform: performing measurements for computing values for all report quantities specified in the channel state information report configuration.
  • the at least one memory and computer program code may be further configured to, with the at least one processor, cause the apparatus to perform: storing measurement results for use in later computing values for the report quantities for one or more transmission/reception points other than the first transmission/reception point.
  • An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus to perform: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance: performing measurements for computing the one or more first quantities and the one or more second quantities; storing measurement results at least for use in later computing values for the one or more second report quantities.
  • the at least one memory and computer program code may be further configured to, with the at least one processor, cause the apparatus to perform: preparing a channel state information report for the transmission/reception point based at least partly on the stored measurement results, based on a determination that one or more of the stored measurement results remain valid for the channel state information report to the transmission/reception point.
  • An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus to perform: comprising: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
  • Preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration may be based on a determination that the one or more results of the one or more measurements remain valid for the channel state information report for the second transmission/reception point.
  • Preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration may be based on a determination that the length of time between receiving the channel state information request from the first transmission/reception point and receiving the channel state information request from the second transmission/reception point does not exceed a threshold value.
  • the at least one memory and computer program code may be further configured to, with the at least one processor, cause the apparatus to perform: making one or more signal measurements in response to receiving the channel state information request from the second transmission/reception point; and preparing a channel state information report for the second transmission/reception point may be based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration is based on a determination that the length of time between making signal measurements in response to the receiving the channel state information request from the first transmission/reception point and making signal measurements in response to receiving the channel state information request from the second transmission/reception point does not exceed a threshold value.
  • Apparatus comprising: means for transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
  • Apparatus comprising: means for, in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point; and means for selectively including the determined values in a channel state information report to the first transmission/reception point.
  • Apparatus comprising: means for, in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, performing measurements for computing the one or more first quantities and the one or more second quantities; and means for storing measurement results at least for use in later computing values for the one or more second report quantities.
  • Apparatus comprising: means for, in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
  • Apparatus comprising: transmitting circuitry for transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
  • Apparatus comprising: determining circuitry for, in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point; and report compilation circuitry for selectively including the determined values in a channel state information report to the first transmission/reception point.
  • Apparatus comprising: measurement circuitry for, in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, performing measurements for computing the one or more first quantities and the one or more second quantities; and storing circuitry for storing measurement results at least for use in later computing values for the one or more second report quantities.
  • Apparatus comprising: report preparing circuitry for, in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
  • a computer readable medium comprising program instructions stored thereon for performing: transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
  • a computer readable medium comprising program instructions stored thereon for performing: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point; and selectively including the determined values in a channel state information report to the first transmission/reception point.
  • a computer readable medium comprising program instructions stored thereon for performing: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, performing measurements for computing the one or more first quantities and the one or more second quantities; and storing measurement results at least for use in later computing values for the one or more second report quantities.
  • a computer readable medium comprising program instructions stored thereon for performing: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
  • a non-transitory computer readable medium comprising program instructions stored thereon for performing: transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
  • a non-transitory computer readable medium comprising program instructions stored thereon for performing: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point; and selectively including the determined values in a channel state information report to the first transmission/reception point.
  • a non-transitory computer readable medium comprising program instructions stored thereon for performing: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, performing measurements for computing the one or more first quantities and the one or more second quantities; and storing measurement results at least for use in later computing values for the one or more second report quantities.
  • a non-transitory computer readable medium comprising program instructions stored thereon for performing: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
  • a computer program comprising computer executable code which when run on at least one processor is configured to cause an apparatus at least to: transmit configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
  • a computer program comprising computer executable code which when run on at least one processor is configured to cause an apparatus at least to: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determine values for the report quantities specified for the first transmission/reception point; and selectively include the determined values in a channel state information report to the first transmission/reception point.
  • a computer program comprising computer executable code which when run on at least one processor is configured to cause an apparatus at least to: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, perform measurements for computing the one or more first quantities and the one or more second quantities; and store measurement results at least for use in later computing values for the one or more second report quantities.
  • a computer program comprising computer executable code which when run on at least one processor is configured to cause an apparatus at least to: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, prepare a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
  • a non-volatile tangible memory medium comprising program instructions stored thereon for performing any of the methods described above.
  • Figure 1 shows a representation of communication system elements according to some example embodiments
  • Figure 2 shows a representation of operations at the communication system elements of Figure 1 according to some example embodiments
  • Figure 3 shows a representation of channel state information (CSI) reporting settings according to some example embodiments
  • FIG. 4 shows a representation of operations at a co-operating set of transmission/reception points (TRPs) and a user equipment (UE) according to some example embodiments;
  • Figure 5a shows a representation of operations at a co-operating set of TRPs according to some example embodiments
  • Figure 5b shows a representation of operations at a UE according to some example embodiments
  • FIG. 6 shows a representation of a transmission/reception point (TRP) according to some example embodiments
  • Figure 7 shows a representation of a user equipment (UE) according to some example embodiments.
  • Figure 8 shows a representation of non-volatile memory media according to some example embodiments
  • Figure 9a shows a representation of operations at TRP according to some example embodiments
  • Figure 9b shows a representation of operations at a UE according to some example embodiments.
  • communication between an access network and UE 102 involves joint transmission (JT) between two TRPs 104, 106 and the UE 102.
  • JT joint transmission
  • Figure 1 and the first part of the following description focuses on the example of joint transmission involving two TRPs, but the techniques are equally applicable to joint transmissions involving more than two TRPs. Further below is a description of a technique for single TRP transmission with channel state information reporting at different time instances.
  • Multiple PDCCH based multi-TRP operation involves each TRP of a cooperating set of two or more TRPs independently scheduling their own PDSCH (physical downlink shared channel) transmissions to the UE 102.
  • PDSCH physical downlink shared channel
  • FIG. 5a shows the operation of cooperating TRPs 104, 106 according to some example embodiments.
  • one or both of TRP 104 and TRP 106 sends a higher layer (e.g. radio resource control (RRC)) message to UE 102 including CSI report configuration information.
  • the higher layer message includes a list of trigger states containing a list of individual CSI trigger states (individual trigger states) each singularly indexable in a downlink control information (DCI) transmission via PDCCH (Physical Downlink Control Channel).
  • Each trigger state in the list is associated with at least one CSI report configuration, and may be associated with two or more CSI report configurations
  • At least one of the CSI Report Configurations specifies report quantities for both TRP1 104 and TRP2 106.
  • Such a CSI Report Configuration includes information by which the UE can identify which report quantities are owned by TRP1 104 and which report quantities are owned by TRP2 106.
  • the report quantities are each marked by an index value specific to the TRP (within the subset of cooperating TRPs (TRP1 104 and TRP2 106 in this example)) that owns the report quantity, by e.g. making new use of the control resource set pool index (CORESETPoollndex) described in 3GPP TS38.331.
  • the UE 102 can identify a CORESETPoollndex value for a CSI request via PDCCH, and thereby identify the report quantities owned by the TRP that transmitted the CSI request.
  • the CSI Report Configuration specifying report quantities owned by both TRP1 104 and TRP2 106 also specifies respective QCL (quasi co-location) assumptions for channel measurement resources for both TRP1 104 and TRP2 106.
  • the QCL assumption(s) for TRP1 104 are also marked in the CSI Report Configuration by a CORESETPoollndex value for TRP1 104
  • the QCL assumption(s) for TRP2 106 are also marked in the CSI-Report- Configuration by a CORESETPoollndex value for TRP2 106.
  • the UE 102 is also provided with one or more validity time intervals for CSI measurements made in response to a CSI request indexing the CSI Report Configuration. This is discussed in more detail below.
  • TRP1 104 transmits an uplink scheduling DCI (e.g. DCI format 0_1 in 5G NR) containing a CSI request indexing, via a trigger state, at least the above-mentioned CSI Report Configuration specifying reporting quantities for both TRP1 104 and TRP2 106.
  • an uplink scheduling DCI e.g. DCI format 0_1 in 5G NR
  • TRP2 106 also transmits an uplink scheduling DCI (e.g. DCI format 0_1 in 5G NR) containing a CSI request indexing, via a trigger state, at least the same CSI Report Configuration specifying reporting quantities for both TRP1 104 and TRP2 106.
  • an uplink scheduling DCI e.g. DCI format 0_1 in 5G NR
  • the transmission by TRP1 104 and TRP2 106 of DCIs indexing the same CSI-Report- Configuration may be the result of some co-ordination between TRP1 104 and TRP 2 106 (Step 502).
  • This co-ordination between TRPs 104, 106 can optimize measurements at the UE 102 and reduce complexity at the UE side.
  • Figure 5b shows the operations of UE 102 according to some example embodiments.
  • UE 102 receives the above-mentioned uplink scheduling DCI from TRP1 104 containing a CSI request indexing at least the above-mentioned CSI Report Configuration specifying reporting quantities for both TRP1 104 and TRP2 106.
  • the UE 102 identifies which QCL assumption(s) and report quantities are owned by which TRP using the CORESETPoollndex (as mentioned above) or, a TRP specific indicator, and makes CSI measurements for TRP1 104.
  • the UE102 also makes CSI measurements for TRP2 106, and stores/buffers the measurement results for TRP2 106 in local memory.
  • the UE 102 computes values only for the report quantities for TRP1 specified in the CSI Report Configuration based only on the CSI measurements for TRP1, and prepares a CSI report for TRP1 including the computed values.
  • the CSI report includes only computed quantity values for TRP1 104.
  • UE 102 transmits the CSI report to TRPI 104.
  • the UE102 receives the above-mentioned uplink scheduling DCI from TRP2 106 containing a CSI request indexing at least the same CSI Report Configuration specifying reporting quantities for both TRP1 104 and TRP2 106.
  • the UE 102 identifies which QCL assumption(s) and report quantities are owned by which TRP using the CORESETPoollndex (as mentioned above), or, a TRP specific indicator.
  • UE 102 makes CSI measurements for TRP2 106.
  • the UE102 also makes CSI measurements for TRP1 104, and stores/buffers the measurement results for TRP1 104 in local memory.
  • UE102 computes values for the remote quantities specified for TRP2 106 in the CSI Report Configuration based on (a) the CSI measurements made for TRP2 106 in response to receiving the CSI request from TRP1 104 and (b) on the CSI measurements made for TRP2 106 in response to receiving the CSI request from TRP2 106.
  • UE102 prepares a CSI report for TRP2 106 including the computed values.
  • the CSI report to TRP2 106 includes only computed quantity values for TRP2.
  • UE 102 transmits the CSI report to TRP2 106.
  • FIG. 3 shows an example of information specified in the CSI Report Configuration indexed by the CSI requests from TRP1 104 and TRP2 106 according to some example embodiments.
  • the CSI Report Configuration specifies: a channel measurement resource (CMR) setting; a non-zero-power (NZP) channel state information reference signal (CSI-RS) interference measurement resource (IMR) setting; a channel state information Interference measurement resource (CSI IM IMR) setting; reporting quantities for TRP1 104; and reporting quantities for TRP2 106.
  • CMR channel measurement resource
  • NZP non-zero-power
  • CSI-RS channel state information reference signal
  • IMR interference measurement resource
  • CSI IM IMR channel state information Interference measurement resource
  • the reporting quantities for TRP2 106 are marked with a CORESETPoollndex value different to the one associated with the PDCCH via which the CSI request was received.
  • the reporting quantities for TRP1 104 are marked with a CORESETPoollndex value different to the one associated with the PDCCH via which the CSI request was received.
  • the UE102 buffers CSI measurement results for TRP2 106, and uses the buffered measurement results when it later receives a CSI request from TRP2 106.
  • this use of the buffered measurement results for TRP2 106 is dependent on the buffered CSI measurement results fulfilling a validity condition.
  • the validity condition is that the time offset between step 504 (the UE102 receiving the CSI request from TRP1 104, in response to which UE 102 makes the measurements for TRP2 106 and buffers the measurement results) and step 506 (the UE 102 receiving the CSI request from TRP2 106) is shorter than a predetermined threshold time interval (validity interval).
  • the validity condition is that the time offset between step 508 (making CSI measurements in response to receiving the CSI request from TRP1 104) and step 512 ( making CSI measurements in response to receiving the CSI request from TRP2 106) is shorter than a predetermined threshold time interval (validity interval).
  • a predetermined threshold time interval validity interval
  • a validity offset/interval may be expressed in terms of slots or symbols and may depend on sub-carrier spacing (SCS), carrier frequency, UE velocity.
  • SCS sub-carrier spacing
  • validity offsets/intervals better avoids the computation and reporting of reporting quantity values based on CSI measurements that have become irrelevant, as could be the case, for example, in the event that radio channel between UE and TRP2 106 change substantially between receiving the CSI request from TRP1 104 and receiving the CSI request from TRP2 106.
  • the use of such validity offsets/intervals can better ensure that UE 102 does not reuse an outdated CSI measurement for CSI reporting.
  • the size of the validity offset/intervalfs depends on the radio channel dynamicity of radio channels.
  • the size of the validity offset/intervalfs may depend on the mobility of UE 102.
  • the size of the validity offset/intervalfs) may be set lower (shorter time) for UEs with high mobility than for UEs with lower mobility.
  • validity offset/intervals are configured per CSI quantity in RRC configuration.
  • a default measurement validity interval is configured in RRC and modified via a medium access control (MAC) control element (CE) in response to any changes in radio conditions.
  • MAC medium access control
  • the UE in response to receiving a CSI request indexing a CSI-Report-Configuration specifying report quantities for both TRP1 104 and TRP2 106, the UE performs measurements on IMR/CMR resources necessary to compute values for all specified reporting quantities (including the reporting quantities specified for the TRP other than the TRP from which it received the CSI request).
  • the UE 102 only performs measurements on IMR/CMR resources necessary to compute the report quantities specified for the TRP from which it received the CSI request.
  • the CSI report sent to a TRP only includes computed values for the reporting quantities specified for that TRP.
  • the CSI report also includes computed values for the reporting quantities specified for the other cooperating TRP(s) (i.e. the CSI report includes computed values for all reporting quantities specified for all TRPs in the CSI Report Configuration).
  • Reporting quantities specified for TRP1 and TRP2 in the CSI Report Configuration may comprise any combination of CSI reporting quantities, including, but not limited to, precoding matrix indicator (PMI), channel quality information (CQI), strongest layer indicator (SLI), CSI-RS resource indicator (CRI), Layer 1 Reference Signal Received Power (L1 -RSRP), Layer 1 Signal to Noise Ratio (L1 -SINR), RSSI (Received Signal Strength Indicator), rank indicator (Rl), and SS (Synchronisation Signal)/PBCH (Physical Broadcast Channel) Resource Block Indicator (SSBRI).
  • CSI reporting configurations are optimised in RRC in order to account for the constraints that can arise in multi-PDCCH based multi-TRP operation, such as cooperation latency due to non-ideal backhaul and requirement of large CSI reporting configuration to support multiple interference hypotheses.
  • CSI reporting measurements and quantities for a first TRP 104 of a cooperating set of TRPs are indicated in a CSI reporting configuration triggered by a second TRP 106 of the cooperating set of TRPs.
  • CMR for the first TRP 104 may be exploited as NZP IMR for a second TRP 106.
  • NJT non-coherent joint transmission
  • L1 -SINR Layer 1 Signal to Noise Ratio
  • measurements at UE 102 triggered by the first TRP 104 may be used for interference computation in order to compute L1 -SINR for the second TRP 106.
  • a single trigger state may trigger CSI measurements for multiple TRPs on the same CMR/IMR resources. This facilitates a reduction in the total number of trigger states.
  • the same IMR/CMR resources are reused for multiple measurements across TRPs. This facilitates a reduction in DL-RS overhead.
  • CMR/IMR resources in a given configuration are used in CSI measurements for multiple-TRPs upon reception of a single trigger. This facilitates the reduction in size of needed CSI reporting configuration for multi-TRP transmission with multiple interference hypotheses.
  • the CSI Report Configuration does not include report quantities for more than one TRP, but instead includes report quantities for a TRP at a first time instance and report quantities for the same TRP at a different, second time instance.
  • TRP sends (STEP 602) a higher layer message (e.g. RRC) message to UE comprising configuration information including at least a first CSI Report Configuration specifying one or more report quantities for the TRP at a first time instance and one or more report quantities for the same TRP at a different, second time instance.
  • the TRP sends (STEP 604a) a lower layer trigger (e.g. DCI transmission) indexing at least this first CSI Report Configuration.
  • a lower layer trigger e.g. DCI transmission
  • the TRP sends (STEP 606a) another lower layer trigger (e.g. DCI transmission) indexing at least a CSI Report Configuration specifying at least the same reporting quantities as those specified for the second time instance in the first CSI Report Configuration.
  • another lower layer trigger e.g. DCI transmission
  • the UE In response to receiving the first lower layer trigger (STEP 604a), the UE performs measurements for all report quantities specified in the first CSI Report Configuration (i.e. both those specified for the first time instance and those specified for the second time instance) and locally stores/buffers the measurement results (STEP 608). UE selectively computes values for the reporting quantities specified for the first time instance and reports them to the TRP (STEP 610). Later, in response to receiving the second lower layer trigger (STEP 606b), UE computes values for the reporting quantities specified for the second time instance at least based on buffered values of measurements triggered by the earlier, first lower layer trigger and optionally also based on measurements triggered by the second lower layer trigger; and reports the computed values to the TRP (STEP 612).
  • the first CSI Report Configuration may specify PMI as a reporting quantity for the first time instance and L1 -RSRP as a reporting quantity for the second time instance.
  • UE makes CSI measurements on the resources specified in the CSI Report Configuration. Based on the results of those measurements, UE computes PMI for those resources, and sends a first CSI report to the TRP at a first time instance including the PMI.
  • second lower layer trigger UE sends a second CSI report to the TRP including L1 -RSRP based at least on the buffered measurement results and optionally also based on the measurements triggered by the second lower layer trigger. This technique can reduce the need for redundant transmission of downlink reference signals.
  • FIG. 6 illustrates an example of a control apparatus 900 for use at any of the TRPs 104, 106.
  • the control apparatus 900 may comprise at least one random access memory (RAM) 911a, at least on read only memory (ROM) 911 b, at least one processor 912, 913 and an input/output interface 914.
  • the at least one processor 912, 913 may be coupled to the RAM 911a and the ROM 911 b.
  • the at least one processor 912, 913 may be configured to execute an appropriate software code 915.
  • the software code 915 may for example allow to perform one or more steps to perform one or more of the operations described above
  • the software code 915 may be stored in the ROM 911 b.
  • the control apparatus 900 at one of the above-mentioned TRPs 104, 106 may be interconnected with another control apparatus 900 at one or more other of the cooperating set of TRPs and with one or more other network entities.
  • FIG. 7 illustrates an example of a user equipment or terminal 1000, such as a user equipment 102 described previously.
  • the terminal 1000 may be provided by any device capable of sending and receiving radio signals.
  • Non-limiting examples comprise a mobile station (MS) or mobile device such as a mobile phone or what is known as a 'smart phone', a computer provided with a wireless interface card or other wireless interface facility (e.g., USB dongle), a personal data assistant (PDA) or a tablet provided with wireless communication capabilities, a machine-type communications (MTC) device, an Internet of things (loT) type communication device or any combinations of these or the like.
  • the terminal 1000 may provide, for example, communication of data for carrying communications.
  • the communications may be one or more of voice, electronic mail (email), text message, multimedia, data, machine data and so on.
  • the terminal 1000 may receive signals over an air or radio interface 1007 via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals.
  • transceiver apparatus is designated schematically by block 1006.
  • the transceiver apparatus 1006 may be provided for example by means of a radio part and associated antenna arrangement.
  • the antenna arrangement may be arranged internally or externally to the mobile device.
  • the terminal 1000 may be provided with at least one processor 1001, at least one memory ROM 1002a, at least one RAM 1002b and other possible components 1003 for use in software and hardware aided execution of tasks it is designed to perform, including control of access to and communications with access systems and other communication devices.
  • the at least one processor 1001 is coupled to the RAM 1011a and the ROM 1011 b.
  • the at least one processor 1001 may be configured to execute an appropriate software code 1008.
  • the software code 1008 may for example allow to perform one or more of the present aspects.
  • the software code 1008 may be stored in the ROM 1011 b.
  • the processor, storage and other relevant control apparatus can be provided on an appropriate circuit board and/or in chipsets. This feature is denoted by reference 1004.
  • the device may optionally have a user interface such as key pad 1005, touch sensitive screen or pad, combinations thereof or the like.
  • a display, a speaker and a microphone may be provided depending on the type of the device.
  • Figure 8 shows a schematic representation of non-volatile memory media 1100a (e.g. computer disc (CD) or digital versatile disc (DVD)) and 1100b (e.g. universal serial bus (USB) memory stick) storing instructions and/or parameters 1102 which when executed by a processor allow the processor to perform one or more of the steps of the methods described previously.
  • 1100a e.g. computer disc (CD) or digital versatile disc (DVD)
  • 1100b e.g. universal serial bus (USB) memory stick
  • embodiments of the present invention may be implemented as circuitry, in software, hardware, application logic or a combination of software, hardware and application logic.
  • the application logic, software or an instruction set is maintained on any one of various conventional computer-readable media.
  • a "computer-readable medium” may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer or smart phone, or user equipment.
  • circuitry refers to all of the following: (a) hardware- only circuit implementations (such as implementations in only analog and/or digital circuitry) and (b) to combinations of circuits and software (and/or firmware), such as (as applicable): (i) to a combination of processor(s) or (ii) to portions of processor(s)/software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and (c) to circuits, such as a microprocessor(s) or a portion of a microprocessor(s), that require software or firmware for operation, even if the software or firmware is not physically present.
  • circuitry would also cover an implementation of merely a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and/or firmware.
  • circuitry would also cover, for example and if applicable to the particular claim element, a baseband integrated circuit or applications processor integrated circuit for a mobile phone or a similar integrated circuit in server, a cellular network device, or other network device.

Abstract

A technique, comprising: transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.

Description

APERIODIC CHANNEL STATE INFORMATION REPORTING
TECHNICAL FIELD
The present disclosure relates to an apparatus, a method, and a computer program and in particular but not exclusively for an apparatus, methods and computer programs for use in a wireless communication system involving reporting channel state information.
BACKGROUND
A wireless communication system may involve a communication device reporting channel state information about one or more channels between one or more transmission points and the device.
SUMMARY
A method, comprising: transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
The first channel state information report configuration may specify report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, wherein one or more report quantities for the first transmission/reception point are distinguishable from one or more report quantities for the second transmission/reception point.
The one or more report quantities for the first transmission/reception point may be distinguishable from the one or more report quantities for the second transmission/reception point by a control resource set pool index value or an explicit transmission/reception point indicator. The first channel state information report configuration may comprise quasi co-location assumptions for channel measurement resources for at least both the first and second transmission/reception points.
The method may further comprise: transmitting information indicating one or more validity time periods for channel state information measurements triggered by a channel state information request indexing the first channel state information report configuration.
A method comprising: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point, and selectively including the determined values in a channel state information report to the first transmission/reception point.
Selectively determining values for the report quantities for the first transmission/reception point may comprise: identifying from the channel state information report configuration one or more report quantities for the first transmission/reception point and identifying from the channel state information report configuration one or more quasi co-location assumptions for the channel measurement resources for the first transmission/reception point; and computing values for the report quantities identified for the first transmission/reception point based on the one or more quasi co-location assumptions identified for the first transmission/reception point.
Identifying one or more report quantities for the first transmission/reception point and identifying one or more quasi co-location assumptions for the channel measurement resources for the first transmission/reception point may comprise selecting one or more report quantities and one or more quasi co-location assumptions that are marked in the channel state information report configuration by a radio resource index value specific to the first transmission/reception point, wherein the radio resource index value is mappable onto the downlink control channel via which the channel state information request is received.
The radio resource index value specific to the first transmission/reception point may comprise a control resource set pool index value. The method may further comprise: performing measurements for computing values for all report quantities specified in the channel state information report configuration.
The method may further comprise: storing measurement results for use in later computing values for the report quantities for one or more transmission/reception points other than the first transmission/reception point.
A method comprising: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance: performing measurements for computing the one or more first quantities and the one or more second quantities; storing measurement results at least for use in later computing values for the one or more second report quantities.
The method may further comprise: preparing a channel state information report for the transmission/reception point based at least partly on the stored measurement results, based on a determination that one or more of the stored measurement results remain valid for the channel state information report to the transmission/reception point.
A method comprising: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
Preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration may be based on a determination that the one or more results of the one or more measurements remain valid for the channel state information report for the second transmission/reception point.
Preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration may be based on a determination that the length of time between receiving the channel state information request from the first transmission/reception point and receiving the channel state information request from the second transmission/reception point does not exceed a threshold value.
The method may further comprise: making one or more signal measurements in response to receiving the channel state information request from the second transmission/reception point; and wherein preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration is based on a determination that the length of time between making signal measurements in response to the receiving the channel state information request from the first transmission/reception point and making signal measurements in response to receiving the channel state information request from the second transmission/reception point does not exceed a threshold value.
An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus to perform: transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances. The first channel state information report configuration may specify report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, wherein one or more report quantities for the first transmission/reception point are distinguishable from one or more report quantities for the second transmission/reception point.
The one or more report quantities for the first transmission/reception point may be distinguishable from the one or more report quantities for the second transmission/reception point by a control resource set pool index value or an explicit transmission/reception point indicator.
The first channel state information report configuration may comprise quasi co-location assumptions for channel measurement resources for at least both the first and second transmission/reception points.
The at least one memory and computer program code may be further configured to, with the at least one processor, cause the apparatus to perform: transmitting information indicating one or more validity time periods for channel state information measurements triggered by a channel state information request indexing the first channel state information report configuration.
An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus to perform: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point, and selectively including the determined values in a channel state information report to the first transmission/reception point.
Selectively determining values for the report quantities for the first transmission/reception point may comprise: identifying from the channel state information report configuration one or more report quantities for the first transmission/reception point and identifying from the channel state information report configuration one or more quasi co-location assumptions for the channel measurement resources for the first transmission/reception point; and computing values for the report quantities identified for the first transmission/reception point based on the one or more quasi co-location assumptions identified for the first transmission/reception point.
Identifying one or more report quantities for the first transmission/reception point and identifying one or more quasi co-location assumptions for the channel measurement resources for the first transmission/reception point may comprise selecting one or more report quantities and one or more quasi co-location assumptions that are marked in the channel state information report configuration by a radio resource index value specific to the first transmission/reception point, wherein the radio resource index value is mappable onto the downlink control channel via which the channel state information request is received.
The radio resource index value specific to the first transmission/reception point may comprise a control resource set pool index value.
The at least one memory and computer program code may be further configured to, with the at least one processor, cause the apparatus to perform: performing measurements for computing values for all report quantities specified in the channel state information report configuration.
The at least one memory and computer program code may be further configured to, with the at least one processor, cause the apparatus to perform: storing measurement results for use in later computing values for the report quantities for one or more transmission/reception points other than the first transmission/reception point.
An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus to perform: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance: performing measurements for computing the one or more first quantities and the one or more second quantities; storing measurement results at least for use in later computing values for the one or more second report quantities.
The at least one memory and computer program code may be further configured to, with the at least one processor, cause the apparatus to perform: preparing a channel state information report for the transmission/reception point based at least partly on the stored measurement results, based on a determination that one or more of the stored measurement results remain valid for the channel state information report to the transmission/reception point.
An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus to perform: comprising: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
Preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration may be based on a determination that the one or more results of the one or more measurements remain valid for the channel state information report for the second transmission/reception point.
Preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration may be based on a determination that the length of time between receiving the channel state information request from the first transmission/reception point and receiving the channel state information request from the second transmission/reception point does not exceed a threshold value.
The at least one memory and computer program code may be further configured to, with the at least one processor, cause the apparatus to perform: making one or more signal measurements in response to receiving the channel state information request from the second transmission/reception point; and preparing a channel state information report for the second transmission/reception point may be based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration is based on a determination that the length of time between making signal measurements in response to the receiving the channel state information request from the first transmission/reception point and making signal measurements in response to receiving the channel state information request from the second transmission/reception point does not exceed a threshold value.
Apparatus, comprising: means for transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
Apparatus comprising: means for, in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point; and means for selectively including the determined values in a channel state information report to the first transmission/reception point. Apparatus comprising: means for, in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, performing measurements for computing the one or more first quantities and the one or more second quantities; and means for storing measurement results at least for use in later computing values for the one or more second report quantities.
Apparatus comprising: means for, in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
Apparatus, comprising: transmitting circuitry for transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
Apparatus comprising: determining circuitry for, in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point; and report compilation circuitry for selectively including the determined values in a channel state information report to the first transmission/reception point. Apparatus comprising: measurement circuitry for, in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, performing measurements for computing the one or more first quantities and the one or more second quantities; and storing circuitry for storing measurement results at least for use in later computing values for the one or more second report quantities.
Apparatus comprising: report preparing circuitry for, in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
A computer readable medium comprising program instructions stored thereon for performing: transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
A computer readable medium comprising program instructions stored thereon for performing: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point; and selectively including the determined values in a channel state information report to the first transmission/reception point.
A computer readable medium comprising program instructions stored thereon for performing: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, performing measurements for computing the one or more first quantities and the one or more second quantities; and storing measurement results at least for use in later computing values for the one or more second report quantities.
A computer readable medium comprising program instructions stored thereon for performing: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
47. A non-transitory computer readable medium comprising program instructions stored thereon for performing: transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
A non-transitory computer readable medium comprising program instructions stored thereon for performing: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point; and selectively including the determined values in a channel state information report to the first transmission/reception point.
A non-transitory computer readable medium comprising program instructions stored thereon for performing: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, performing measurements for computing the one or more first quantities and the one or more second quantities; and storing measurement results at least for use in later computing values for the one or more second report quantities.
A non-transitory computer readable medium comprising program instructions stored thereon for performing: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
A computer program comprising computer executable code which when run on at least one processor is configured to cause an apparatus at least to: transmit configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
A computer program comprising computer executable code which when run on at least one processor is configured to cause an apparatus at least to: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determine values for the report quantities specified for the first transmission/reception point; and selectively include the determined values in a channel state information report to the first transmission/reception point.
A computer program comprising computer executable code which when run on at least one processor is configured to cause an apparatus at least to: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, perform measurements for computing the one or more first quantities and the one or more second quantities; and store measurement results at least for use in later computing values for the one or more second report quantities.
A computer program comprising computer executable code which when run on at least one processor is configured to cause an apparatus at least to: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, prepare a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration. A non-volatile tangible memory medium comprising program instructions stored thereon for performing any of the methods described above.
In the above, many different aspects have been described. It should be appreciated that further aspects may be provided by the combination of any two or more of the aspects described above. Various other aspects are also described in the following detailed description and in the attached claims.
BRIEF DESCRIPTION OF THE FIGURES
Some example embodiments will now be described in further detail, by way of example only, with reference to the following examples and accompanying drawings, in which:
Figure 1 shows a representation of communication system elements according to some example embodiments;
Figure 2 shows a representation of operations at the communication system elements of Figure 1 according to some example embodiments;
Figure 3 shows a representation of channel state information (CSI) reporting settings according to some example embodiments;
Figure 4 shows a representation of operations at a co-operating set of transmission/reception points (TRPs) and a user equipment (UE) according to some example embodiments;
Figure 5a shows a representation of operations at a co-operating set of TRPs according to some example embodiments;
Figure 5b shows a representation of operations at a UE according to some example embodiments
Figure 6 shows a representation of a transmission/reception point (TRP) according to some example embodiments;
Figure 7 shows a representation of a user equipment (UE) according to some example embodiments; and
Figure 8 shows a representation of non-volatile memory media according to some example embodiments
Figure 9a shows a representation of operations at TRP according to some example embodiments; Figure 9b shows a representation of operations at a UE according to some example embodiments.
DETAILED DESCRIPTION
With reference to Figure 1, according to some example embodiments, communication between an access network and UE 102 involves joint transmission (JT) between two TRPs 104, 106 and the UE 102. Figure 1 and the first part of the following description focuses on the example of joint transmission involving two TRPs, but the techniques are equally applicable to joint transmissions involving more than two TRPs. Further below is a description of a technique for single TRP transmission with channel state information reporting at different time instances.
The following description focusses on the example of independent aperiodic CSI triggering in multiple-PDCCH based multi-TRP in the framework of 5G New Radio (NR) MIMO enhancements in 3GPP Rel-17, but the techniques are also applicable to other systems. Multiple PDCCH based multi-TRP operation involves each TRP of a cooperating set of two or more TRPs independently scheduling their own PDSCH (physical downlink shared channel) transmissions to the UE 102.
Reference is made to Figure 5a, which shows the operation of cooperating TRPs 104, 106 according to some example embodiments.
At step 500, one or both of TRP 104 and TRP 106 sends a higher layer (e.g. radio resource control (RRC)) message to UE 102 including CSI report configuration information. The higher layer message includes a list of trigger states containing a list of individual CSI trigger states (individual trigger states) each singularly indexable in a downlink control information (DCI) transmission via PDCCH (Physical Downlink Control Channel). Each trigger state in the list is associated with at least one CSI report configuration, and may be associated with two or more CSI report configurations At least one of the CSI Report Configurations specifies report quantities for both TRP1 104 and TRP2 106. Such a CSI Report Configuration includes information by which the UE can identify which report quantities are owned by TRP1 104 and which report quantities are owned by TRP2 106. In this example, the report quantities are each marked by an index value specific to the TRP (within the subset of cooperating TRPs (TRP1 104 and TRP2 106 in this example)) that owns the report quantity, by e.g. making new use of the control resource set pool index (CORESETPoollndex) described in 3GPP TS38.331. The UE 102 can identify a CORESETPoollndex value for a CSI request via PDCCH, and thereby identify the report quantities owned by the TRP that transmitted the CSI request.
The CSI Report Configuration specifying report quantities owned by both TRP1 104 and TRP2 106 also specifies respective QCL (quasi co-location) assumptions for channel measurement resources for both TRP1 104 and TRP2 106. In this example, the QCL assumption(s) for TRP1 104 are also marked in the CSI Report Configuration by a CORESETPoollndex value for TRP1 104, and the QCL assumption(s) for TRP2 106 are also marked in the CSI-Report- Configuration by a CORESETPoollndex value for TRP2 106.
The UE 102 is also provided with one or more validity time intervals for CSI measurements made in response to a CSI request indexing the CSI Report Configuration. This is discussed in more detail below.
Later, at step 504a: TRP1 104 transmits an uplink scheduling DCI (e.g. DCI format 0_1 in 5G NR) containing a CSI request indexing, via a trigger state, at least the above-mentioned CSI Report Configuration specifying reporting quantities for both TRP1 104 and TRP2 106.
Further later, at step 506a: TRP2 106 also transmits an uplink scheduling DCI (e.g. DCI format 0_1 in 5G NR) containing a CSI request indexing, via a trigger state, at least the same CSI Report Configuration specifying reporting quantities for both TRP1 104 and TRP2 106.
The transmission by TRP1 104 and TRP2 106 of DCIs indexing the same CSI-Report- Configuration may be the result of some co-ordination between TRP1 104 and TRP 2 106 (Step 502). -This co-ordination between TRPs 104, 106 can optimize measurements at the UE 102 and reduce complexity at the UE side. Figure 5b shows the operations of UE 102 according to some example embodiments.
At step 504b: UE 102 receives the above-mentioned uplink scheduling DCI from TRP1 104 containing a CSI request indexing at least the above-mentioned CSI Report Configuration specifying reporting quantities for both TRP1 104 and TRP2 106.
At step 508b: the UE 102 identifies which QCL assumption(s) and report quantities are owned by which TRP using the CORESETPoollndex (as mentioned above) or, a TRP specific indicator, and makes CSI measurements for TRP1 104. In this example embodiment, the UE102 also makes CSI measurements for TRP2 106, and stores/buffers the measurement results for TRP2 106 in local memory.
At step 510, the UE 102 computes values only for the report quantities for TRP1 specified in the CSI Report Configuration based only on the CSI measurements for TRP1, and prepares a CSI report for TRP1 including the computed values. In this example, the CSI report includes only computed quantity values for TRP1 104. UE 102 transmits the CSI report to TRPI 104.
At step 506b: the UE102 receives the above-mentioned uplink scheduling DCI from TRP2 106 containing a CSI request indexing at least the same CSI Report Configuration specifying reporting quantities for both TRP1 104 and TRP2 106.
At step 512, the UE 102 identifies which QCL assumption(s) and report quantities are owned by which TRP using the CORESETPoollndex (as mentioned above), or, a TRP specific indicator. UE 102 makes CSI measurements for TRP2 106. In this example embodiment, the UE102 also makes CSI measurements for TRP1 104, and stores/buffers the measurement results for TRP1 104 in local memory.
At step 514 UE102 computes values for the remote quantities specified for TRP2 106 in the CSI Report Configuration based on (a) the CSI measurements made for TRP2 106 in response to receiving the CSI request from TRP1 104 and (b) on the CSI measurements made for TRP2 106 in response to receiving the CSI request from TRP2 106. UE102 prepares a CSI report for TRP2 106 including the computed values. In this example, the CSI report to TRP2 106 includes only computed quantity values for TRP2. UE 102 transmits the CSI report to TRP2 106.
Figure 3 shows an example of information specified in the CSI Report Configuration indexed by the CSI requests from TRP1 104 and TRP2 106 according to some example embodiments. The CSI Report Configuration specifies: a channel measurement resource (CMR) setting; a non-zero-power (NZP) channel state information reference signal (CSI-RS) interference measurement resource (IMR) setting; a channel state information Interference measurement resource (CSI IM IMR) setting; reporting quantities for TRP1 104; and reporting quantities for TRP2 106. In the case (left side of Figure 3) of a CSI request from TRP1 104 indexing this CSI Report Configuration, the reporting quantities for TRP2 106 are marked with a CORESETPoollndex value different to the one associated with the PDCCH via which the CSI request was received. In the case (right side of Figure 3) of a CSI request from TRP2 106 indexing this CSI Report Configuration , the reporting quantities for TRP1 104 are marked with a CORESETPoollndex value different to the one associated with the PDCCH via which the CSI request was received.
As mentioned above, at step 508 the UE102 buffers CSI measurement results for TRP2 106, and uses the buffered measurement results when it later receives a CSI request from TRP2 106. According to some example embodiments, this use of the buffered measurement results for TRP2 106 is dependent on the buffered CSI measurement results fulfilling a validity condition. In the example shown in Figure 4, the validity condition is that the time offset between step 504 (the UE102 receiving the CSI request from TRP1 104, in response to which UE 102 makes the measurements for TRP2 106 and buffers the measurement results) and step 506 (the UE 102 receiving the CSI request from TRP2 106) is shorter than a predetermined threshold time interval (validity interval). In an alternative example (not shown in Figure 4), the validity condition is that the time offset between step 508 (making CSI measurements in response to receiving the CSI request from TRP1 104) and step 512 ( making CSI measurements in response to receiving the CSI request from TRP2 106) is shorter than a predetermined threshold time interval (validity interval). • In one example, different sizes of validity offsets/intervals are set for different CSI measurements and/or reporting quantities.
The use of such validity offsets/intervals can improve the accuracy with which the channel state is reported to the TRPs 104, 106. A validity offset/interval may be expressed in terms of slots or symbols and may depend on sub-carrier spacing (SCS), carrier frequency, UE velocity.
The use of such validity offsets/intervals better avoids the computation and reporting of reporting quantity values based on CSI measurements that have become irrelevant, as could be the case, for example, in the event that radio channel between UE and TRP2 106 change substantially between receiving the CSI request from TRP1 104 and receiving the CSI request from TRP2 106. The use of such validity offsets/intervals can better ensure that UE 102 does not reuse an outdated CSI measurement for CSI reporting.
In some embodiments, the size of the validity offset/intervalfs) depends on the radio channel dynamicity of radio channels. For example, the size of the validity offset/intervalfs) may depend on the mobility of UE 102. The size of the validity offset/intervalfs) may be set lower (shorter time) for UEs with high mobility than for UEs with lower mobility.
According to one example, validity offset/intervals are configured per CSI quantity in RRC configuration. According to an alternative example, a default measurement validity interval is configured in RRC and modified via a medium access control (MAC) control element (CE) in response to any changes in radio conditions.
In the example embodiments described above: in response to receiving a CSI request indexing a CSI-Report-Configuration specifying report quantities for both TRP1 104 and TRP2 106, the UE performs measurements on IMR/CMR resources necessary to compute values for all specified reporting quantities (including the reporting quantities specified for the TRP other than the TRP from which it received the CSI request). In one example variation: the UE 102 only performs measurements on IMR/CMR resources necessary to compute the report quantities specified for the TRP from which it received the CSI request. In the example embodiment described above, the CSI report sent to a TRP only includes computed values for the reporting quantities specified for that TRP. According to one example variation, the CSI report also includes computed values for the reporting quantities specified for the other cooperating TRP(s) (i.e. the CSI report includes computed values for all reporting quantities specified for all TRPs in the CSI Report Configuration).
Reporting quantities specified for TRP1 and TRP2 in the CSI Report Configuration may comprise any combination of CSI reporting quantities, including, but not limited to, precoding matrix indicator (PMI), channel quality information (CQI), strongest layer indicator (SLI), CSI-RS resource indicator (CRI), Layer 1 Reference Signal Received Power (L1 -RSRP), Layer 1 Signal to Noise Ratio (L1 -SINR), RSSI (Received Signal Strength Indicator), rank indicator (Rl), and SS (Synchronisation Signal)/PBCH (Physical Broadcast Channel) Resource Block Indicator (SSBRI).
According to some example embodiments, CSI reporting configurations are optimised in RRC in order to account for the constraints that can arise in multi-PDCCH based multi-TRP operation, such as cooperation latency due to non-ideal backhaul and requirement of large CSI reporting configuration to support multiple interference hypotheses.
According to some example embodiments, CSI reporting measurements and quantities for a first TRP 104 of a cooperating set of TRPs are indicated in a CSI reporting configuration triggered by a second TRP 106 of the cooperating set of TRPs. This enables exploitation of any redundancy in configured measurement resources/measurements. For example, CMR for the first TRP 104 may be exploited as NZP IMR for a second TRP 106. In the event that UE 102 needs to feedback a CSI report with non-coherent joint transmission (NCJT) assumption to the second TRP 106, measurements at UE 102 that were triggered by the first TRP 106 may be relevant (since the first TRP 104 needs to be considered in interference in case of joint transmission assumption). Additionally, for Layer 1 Signal to Noise Ratio (L1 -SINR), measurements at UE 102 triggered by the first TRP 104 may be used for interference computation in order to compute L1 -SINR for the second TRP 106. According to some example embodiments, a single trigger state may trigger CSI measurements for multiple TRPs on the same CMR/IMR resources. This facilitates a reduction in the total number of trigger states.
According to some example embodiments, the same IMR/CMR resources are reused for multiple measurements across TRPs. This facilitates a reduction in DL-RS overhead.
According to some example embodiments, CMR/IMR resources in a given configuration are used in CSI measurements for multiple-TRPs upon reception of a single trigger. This facilitates the reduction in size of needed CSI reporting configuration for multi-TRP transmission with multiple interference hypotheses.
According to other example embodiments, the CSI Report Configuration does not include report quantities for more than one TRP, but instead includes report quantities for a TRP at a first time instance and report quantities for the same TRP at a different, second time instance. With reference to Figures 9a and 9b: TRP sends (STEP 602) a higher layer message (e.g. RRC) message to UE comprising configuration information including at least a first CSI Report Configuration specifying one or more report quantities for the TRP at a first time instance and one or more report quantities for the same TRP at a different, second time instance. Later, the TRP sends (STEP 604a) a lower layer trigger (e.g. DCI transmission) indexing at least this first CSI Report Configuration.
Further later, the TRP sends (STEP 606a) another lower layer trigger (e.g. DCI transmission) indexing at least a CSI Report Configuration specifying at least the same reporting quantities as those specified for the second time instance in the first CSI Report Configuration.
In response to receiving the first lower layer trigger (STEP 604a), the UE performs measurements for all report quantities specified in the first CSI Report Configuration (i.e. both those specified for the first time instance and those specified for the second time instance) and locally stores/buffers the measurement results (STEP 608). UE selectively computes values for the reporting quantities specified for the first time instance and reports them to the TRP (STEP 610). Later, in response to receiving the second lower layer trigger (STEP 606b), UE computes values for the reporting quantities specified for the second time instance at least based on buffered values of measurements triggered by the earlier, first lower layer trigger and optionally also based on measurements triggered by the second lower layer trigger; and reports the computed values to the TRP (STEP 612).
For example, the first CSI Report Configuration may specify PMI as a reporting quantity for the first time instance and L1 -RSRP as a reporting quantity for the second time instance. In response to receiving the first lower layer trigger (STEP 604a), UE makes CSI measurements on the resources specified in the CSI Report Configuration. Based on the results of those measurements, UE computes PMI for those resources, and sends a first CSI report to the TRP at a first time instance including the PMI. In response to receiving the later, second lower layer trigger UE sends a second CSI report to the TRP including L1 -RSRP based at least on the buffered measurement results and optionally also based on the measurements triggered by the second lower layer trigger. This technique can reduce the need for redundant transmission of downlink reference signals.
Figure 6 illustrates an example of a control apparatus 900 for use at any of the TRPs 104, 106. The control apparatus 900 may comprise at least one random access memory (RAM) 911a, at least on read only memory (ROM) 911 b, at least one processor 912, 913 and an input/output interface 914. The at least one processor 912, 913 may be coupled to the RAM 911a and the ROM 911 b. The at least one processor 912, 913 may be configured to execute an appropriate software code 915. The software code 915 may for example allow to perform one or more steps to perform one or more of the operations described above The software code 915 may be stored in the ROM 911 b. The control apparatus 900 at one of the above-mentioned TRPs 104, 106 may be interconnected with another control apparatus 900 at one or more other of the cooperating set of TRPs and with one or more other network entities.
Figure 7 illustrates an example of a user equipment or terminal 1000, such as a user equipment 102 described previously. The terminal 1000 may be provided by any device capable of sending and receiving radio signals. Non-limiting examples comprise a mobile station (MS) or mobile device such as a mobile phone or what is known as a 'smart phone', a computer provided with a wireless interface card or other wireless interface facility (e.g., USB dongle), a personal data assistant (PDA) or a tablet provided with wireless communication capabilities, a machine-type communications (MTC) device, an Internet of things (loT) type communication device or any combinations of these or the like. The terminal 1000 may provide, for example, communication of data for carrying communications. The communications may be one or more of voice, electronic mail (email), text message, multimedia, data, machine data and so on.
The terminal 1000 may receive signals over an air or radio interface 1007 via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals. In Figure 7 transceiver apparatus is designated schematically by block 1006. The transceiver apparatus 1006 may be provided for example by means of a radio part and associated antenna arrangement. The antenna arrangement may be arranged internally or externally to the mobile device.
The terminal 1000 may be provided with at least one processor 1001, at least one memory ROM 1002a, at least one RAM 1002b and other possible components 1003 for use in software and hardware aided execution of tasks it is designed to perform, including control of access to and communications with access systems and other communication devices. The at least one processor 1001 is coupled to the RAM 1011a and the ROM 1011 b. The at least one processor 1001 may be configured to execute an appropriate software code 1008. The software code 1008 may for example allow to perform one or more of the present aspects. The software code 1008 may be stored in the ROM 1011 b.
The processor, storage and other relevant control apparatus can be provided on an appropriate circuit board and/or in chipsets. This feature is denoted by reference 1004. The device may optionally have a user interface such as key pad 1005, touch sensitive screen or pad, combinations thereof or the like. Optionally one or more of a display, a speaker and a microphone may be provided depending on the type of the device.
Figure 8 shows a schematic representation of non-volatile memory media 1100a (e.g. computer disc (CD) or digital versatile disc (DVD)) and 1100b (e.g. universal serial bus (USB) memory stick) storing instructions and/or parameters 1102 which when executed by a processor allow the processor to perform one or more of the steps of the methods described previously.
It is to be noted that embodiments of the present invention may be implemented as circuitry, in software, hardware, application logic or a combination of software, hardware and application logic. In an example embodiment, the application logic, software or an instruction set is maintained on any one of various conventional computer-readable media. In the context of this document, a "computer-readable medium" may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer or smart phone, or user equipment.
As used in this application, the term "circuitry" refers to all of the following: (a) hardware- only circuit implementations (such as implementations in only analog and/or digital circuitry) and (b) to combinations of circuits and software (and/or firmware), such as (as applicable): (i) to a combination of processor(s) or (ii) to portions of processor(s)/software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and (c) to circuits, such as a microprocessor(s) or a portion of a microprocessor(s), that require software or firmware for operation, even if the software or firmware is not physically present. This definition of 'circuitry' applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term "circuitry" would also cover an implementation of merely a processor (or multiple processors) or portion of a processor and its (or their) accompanying software and/or firmware. The term "circuitry" would also cover, for example and if applicable to the particular claim element, a baseband integrated circuit or applications processor integrated circuit for a mobile phone or a similar integrated circuit in server, a cellular network device, or other network device.
The described features, advantages, and characteristics of the invention can be combined in any suitable manner in one or more embodiments. One skilled in the relevant art will recognize that the invention can be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages can be recognized in certain embodiments that may not be present in all embodiments of the invention. One having ordinary skill in the art will readily understand that the invention as discussed above may be practiced with steps in a different order, and/or with hardware elements in configurations which are different than those which are disclosed. Therefore, although the invention has been described based upon these preferred embodiments, it would be apparent to those of skill in the art that certain modifications, variations, and alternative constructions would be apparent, while remaining within the spirit and scope of the invention.

Claims

1. A method, comprising: transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
2. The method according to claim 1, wherein the first channel state information report configuration specifies report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, wherein one or more report quantities for the first transmission/reception point are distinguishable from one or more report quantities for the second transmission/reception point.
3. The method according to claim 2, wherein the one or more report quantities for the first transmission/reception point are distinguishable from the one or more report quantities for the second transmission/reception point by a control resource set pool index value or an explicit transmission/reception point indicator.
4. The method according to claim 3, wherein the first channel state information report configuration comprises quasi co-location assumptions for channel measurement resources for at least both the first and second transmission/reception points.
5. The method according to any of claims 2 to 4, further comprising transmitting information indicating one or more validity time periods for channel state information measurements triggered by a channel state information request indexing the first channel state information report configuration.
6. A method comprising: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities
26 specified for the first transmission/reception point, and selectively including the determined values in a channel state information report to the first transmission/reception point.
7. The method according to claim 6, wherein selectively determining values for the report quantities for the first transmission/reception point comprises: identifying from the channel state information report configuration one or more report quantities for the first transmission/reception point and identifying from the channel state information report configuration one or more quasi co-location assumptions for the channel measurement resources for the first transmission/reception point; and computing values for the report quantities identified for the first transmission/reception point based on the one or more quasi co-location assumptions identified for the first transmission/reception point.
8. The method according to claim 7, wherein identifying one or more report quantities for the first transmission/reception point and identifying one or more quasi co-location assumptions for the channel measurement resources for the first transmission/reception point comprises selecting one or more report quantities and one or more quasi co-location assumptions that are marked in the channel state information report configuration by a radio resource index value specific to the first transmission/reception point, wherein the radio resource index value is mappable onto the downlink control channel via which the channel state information request is received.
9. The method according to claim 8, wherein the radio resource index value specific to the first transmission/reception point comprises a control resource set pool index value.
10. The method according to claim 6, comprising performing measurements for computing values for all report quantities specified in the channel state information report configuration.
11. The method according to claim 10, comprising storing measurement results for use in later computing values for the report quantities for one or more transmission/reception points other than the first transmission/reception point.
12. A method comprising: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance: performing measurements for computing the one or more first quantities and the one or more second quantities; storing measurement results at least for use in later computing values for the one or more second report quantities.
13. The method according to claim 12, comprising preparing a channel state information report for the transmission/reception point based at least partly on the stored measurement results, based on a determination that one or more of the stored measurement results remain valid for the channel state information report to the transmission/reception point.
14. A method comprising: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
15. The method according to claim 14, wherein preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration is based on a determination that the one or more results of the one or more measurements remain valid for the channel state information report for the second transmission/reception point.
16. The method according to claim 15, wherein preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration is based on a determination that the length of time between receiving the channel state information request from the first transmission/reception point and receiving the channel state information request from the second transmission/reception point does not exceed a threshold value.
17. The method according to claim 15, further comprising: making one or more signal measurements in response to receiving the channel state information request from the second transmission/reception point; and wherein preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration is based on a determination that the length of time between making signal measurements in response to the receiving the channel state information request from the first transmission/reception point and making signal measurements in response to receiving the channel state information request from the second transmission/reception point does not exceed a threshold value.
18. An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus to perform: transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
19. The apparatus according to claim 18, wherein the first channel state information report configuration specifies report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, wherein one or more report quantities for the first transmission/reception point are distinguishable from one or more report quantities for the second transmission/reception point.
20. The apparatus according to claim 19, wherein the one or more report quantities for the first transmission/reception point are distinguishable from the one or more report
29 quantities for the second transmission/reception point by a control resource set pool index value or an explicit transmission/reception point indicator.
21. The apparatus according to claim 20, wherein the first channel state information report configuration comprises quasi co-location assumptions for channel measurement resources for at least both the first and second transmission/reception points.
22. The apparatus according to any of claims 19 to 21, wherein the at least one memory and computer program code are configured to, with the at least one processor, cause the apparatus to perform: transmitting information indicating one or more validity time periods for channel state information measurements triggered by a channel state information request indexing the first channel state information report configuration.
23. An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus to perform: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point, and selectively including the determined values in a channel state information report to the first transmission/reception point.
24. The apparatus according to claim 23, wherein selectively determining values for the report quantities for the first transmission/reception point comprises: identifying from the channel state information report configuration one or more report quantities for the first transmission/reception point and identifying from the channel state information report configuration one or more quasi co-location assumptions for the channel measurement resources for the first transmission/reception point; and computing values for the report quantities identified for the first transmission/reception point based on the one or more quasi co-location assumptions identified for the first transmission/reception point.
25. The apparatus according to claim 24, wherein identifying one or more report quantities for the first transmission/reception point and identifying one or more quasi co-
30 location assumptions for the channel measurement resources for the first transmission/reception point comprises selecting one or more report quantities and one or more quasi co-location assumptions that are marked in the channel state information report configuration by a radio resource index value specific to the first transmission/reception point, wherein the radio resource index value is mappable onto the downlink control channel via which the channel state information request is received.
26. The apparatus according to claim 25, wherein the radio resource index value specific to the first transmission/reception point comprises a control resource set pool index value.
27. The apparatus according to claim 23, wherein the at least one memory and computer program code are configured to, with the at least one processor, cause the apparatus to perform: performing measurements for computing values for all report quantities specified in the channel state information report configuration.
28. The apparatus according to claim 27, wherein the at least one memory and computer program code are configured to, with the at least one processor, cause the apparatus to perform: storing measurement results for use in later computing values for the report quantities for one or more transmission/reception points other than the first transmission/reception point.
29. An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus to perform: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance: performing measurements for computing the one or more first quantities and the one or more second quantities; storing measurement results at least for use in later computing values for the one or more second report quantities.
30. The apparatus according to claim 29, wherein the at least one memory and computer program code are configured to, with the at least one processor, cause the apparatus to perform: preparing a channel state information report for the transmission/reception point
31 based at least partly on the stored measurement results, based on a determination that one or more of the stored measurement results remain valid for the channel state information report to the transmission/reception point.
31. An apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus to perform: comprising: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
32. The apparatus according to claim 31, wherein preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration is based on a determination that the one or more results of the one or more measurements remain valid for the channel state information report for the second transmission/reception point.
33. The apparatus according to claim 32, wherein preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration is based on a determination that the length of time between receiving the channel state information request from the first transmission/reception point and receiving the channel state information request from the second transmission/reception point does not exceed a threshold value.
32
34. The apparatus according to claim 32, wherein the at least one memory and computer program code are configured to, with the at least one processor, cause the apparatus to perform: making one or more signal measurements in response to receiving the channel state information request from the second transmission/reception point; and wherein preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration is based on a determination that the length of time between making signal measurements in response to the receiving the channel state information request from the first transmission/reception point and making signal measurements in response to receiving the channel state information request from the second transmission/reception point does not exceed a threshold value.
35. Apparatus, comprising: means for transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
36. Apparatus comprising: means for, in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point; and means for selectively including the determined values in a channel state information report to the first transmission/reception point.
37. Apparatus comprising: means for, in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report
33 quantities for the transmission/reception point at a second time instance, performing measurements for computing the one or more first quantities and the one or more second quantities; and means for storing measurement results at least for use in later computing values for the one or more second report quantities.
38. Apparatus comprising: means for, in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
39. Apparatus, comprising: transmitting circuitry for transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
40. Apparatus comprising: determining circuitry for, in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point; and report compilation circuitry for selectively including the determined values in a channel state information report to the first transmission/reception point.
41. Apparatus comprising: measurement circuitry for, in response to receiving a channel state information request from a transmission/reception point indexing at least a channel
34 state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, performing measurements for computing the one or more first quantities and the one or more second quantities; and storing circuitry for storing measurement results at least for use in later computing values for the one or more second report quantities.
42. Apparatus comprising: report preparing circuitry for, in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
43. A computer readable medium comprising program instructions stored thereon for performing: transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
44. A computer readable medium comprising program instructions stored thereon for performing: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point; and selectively including the determined values in a channel state information report to the first transmission/reception point.
35
45. A computer readable medium comprising program instructions stored thereon for performing: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, performing measurements for computing the one or more first quantities and the one or more second quantities; and storing measurement results at least for use in later computing values for the one or more second report quantities.
46. A computer readable medium comprising program instructions stored thereon for performing: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
47. A non-transitory computer readable medium comprising program instructions stored thereon for performing: transmitting configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
48. A non-transitory computer readable medium comprising program instructions stored thereon for performing: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of
36 transmission/reception points, selectively determining values for the report quantities specified for the first transmission/reception point; and selectively including the determined values in a channel state information report to the first transmission/reception point.
49. A non-transitory computer readable medium comprising program instructions stored thereon for performing: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, performing measurements for computing the one or more first quantities and the one or more second quantities; and storing measurement results at least for use in later computing values for the one or more second report quantities.
50. A non-transitory computer readable medium comprising program instructions stored thereon for performing: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, preparing a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
51. A computer program comprising computer executable code which when run on at least one processor is configured to cause an apparatus at least to: transmit configuration information indicating one or more channel state information report configurations, wherein the one or more channel state information report configurations comprise at least a first channel state information report configuration specifying report quantities for at least first and second transmission/reception points in a cooperation set of transmission/reception points, or report quantities for a transmission/reception point at two or more different time instances.
37
52. A computer program comprising computer executable code which when run on at least one processor is configured to cause an apparatus at least to: in response to receiving a channel state information request from a first transmission/reception point indexing at least a channel state information report configuration specifying report quantities for at least the first transmission/reception point and at least one other transmission/reception point in a cooperation set of transmission/reception points, selectively determine values for the report quantities specified for the first transmission/reception point; and selectively include the determined values in a channel state information report to the first transmission/reception point.
53. A computer program comprising computer executable code which when run on at least one processor is configured to cause an apparatus at least to: in response to receiving a channel state information request from a transmission/reception point indexing at least a channel state information report configuration specifying one or more first report quantities for the transmission/reception point at a first time instance, and one or more second report quantities for the transmission/reception point at a second time instance, perform measurements for computing the one or more first quantities and the one or more second quantities; and store measurement results at least for use in later computing values for the one or more second report quantities.
54. A computer program comprising computer executable code which when run on at least one processor is configured to cause an apparatus at least to: in response to receiving from a first transmission/reception point a channel state information request indexing at least a first channel state information report configuration specifying report quantities for at least said first transmission/reception point and a second transmission/reception point in a cooperation set of transmission/reception points, prepare a channel state information report for the second transmission/reception point based at least partly on one or more results of one or more measurements made in response to previously receiving from the first transmission/reception point a channel state information request indexing at least said first channel state information report configuration.
55. A non-volatile tangible memory medium comprising program instructions stored thereon for performing any of the methods of claims 1 to 17.
38
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