TECHNICAL FIELD
The present disclosure relates to the field of wireless communications, and in particular to
5 methods and apparatuses for enhancing the reporting of the channel state information (CSI)
with respect to multiple downlink resources in a wireless communications network such as
advanced 5G networks.
BACKGROUND
The fifth generation (5G) mobile communications system also known as new radio (NR)
10 provides a higher level of performance than the previous generations of mobile
communications system. 5G mobile communications has been driven by the need to provide
ubiquitous connectivity for applications as diverse automotive communication, remote control
with feedback, video downloads, as well as data applications for Internet-of-Things (loT)
devices, machine type communication (MTC) devices, etc. 5G wireless technology brings
15 several main benefits, such as faster speed, shorter delays, and increased connectivity. The
third generation partnership project (3GPP) provides the complete system specification for the
5G network architecture, which includes at least a radio access network (RAN), core transport
networks (CN) and service capabilities.
20 Figure 1 illustrates a simplified schematic view of an example of a wireless communications
network 100 including a core network (CN) 110 and a radio access network (RAN) 120. The
RAN 120 is shown including a plurality of network nodes or radio base stations, which in 5G
are called gNBs. Three radio base stations are depicted gNB1, gNB2 and gNB3. Each gNB
serves an area called a coverage area or a cell. Figure 1 illustrates 3 cells 121, 122 and 123,
25 each served by its own gNB, gNB1, gNB2 and gNB3 respectively. It should be mentioned that
the network 100 may include any number of cells and gNBs. The radio base stations, or
network nodes serve users within a cell. In 4G or L TE, a radio base station is called an eNB,
in 3G or UMTS, a radio base station is called an eNodeB, and BS in other radio access
technologies. A user or a user equipment (UE) may be a wireless or a mobile terminal device
30 or a stationary communication device. A mobile terminal device or a UE may also be an loT
device, an MTC device, etc. loT devices may include wireless sensors, software, actuators,
and computer devices. They can be imbedded into mobile devices, motor vehicle, industrial
equipment, environmental sensors, medical devices, aerial vehicles and more, as well as
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network connectivity that enables these devices to collect and exchange data across an
existing network infrastructure.
Referring back to Figure 1, each cell is shown including UEs and loT devices. gNB1 in cell121
5 serves UE1121A, UE2 121B and loT device 121C. Similarly, gNB2 in cell 121 serves
UE3 122A, UE4 122B and loT device 122C, and gNB3 in cell 123 serves UES 123A,
UE6 123B and loT device 123C. The network 100 may include any number of UEs and loT
devices or any other types of devices. The devices communicate with the serving gNB(s) in
the uplink and the gNB(s) communicate with the devices in the downlink. The respective base
10 station gNB1 to gNB3 may be connected to the CN 120, e.g. via the S1 interface, via respective
backhaul links 111, 121 D, 1220, 1230, which are schematically depicted in Fig. 1 by the
arrows pointing to "core". The core network 120 may be connected to one or more external
networks, such as the Internet. The gNBs may be connected to each other via the S1 interface
or the X2 interface or the XN interface in SG, via respective interface links 121 E, 122E and
15 123E, which is depicted in the figure by the arrows pointing to gNBs.
For data transmission a physical resource grid may be used. The physical resource grid may
comprise a set of resource elements (REs) to which various physical channels and physical
signals are mapped. For example, the physical channels may include the physical downlink,
20 uplink and/or sidelink (SL) shared channels (POSCH, PUSCH, PSSCH) carrying user specific
data, also referred to as downlink, uplink or sidelink payload data, the physical broadcast
channel (PBCH) carrying for example a master information block (MIB) and a system
information block (SIB), the physical downlink, uplink and/or sidelink control channels
(PDCCH, PUCCH, PSCCH) carrying for example the downlink control information (DCI), the
25 uplink control information (UCI) or the sidelink control information (SCI). For the uplink, the
physical channels may further include the physical random access channel (PRACH or RACH)
used by UEs for accessing the network once a UE is synchronized and obtains the MIB and
SIB. The physical signals may comprise reference signals (RS), synchronization signals (SSs)
and the like. The resource grid may comprise a frame or radio frame having a certain duration,
30 like 10 milliseconds, in the time domain and having a given bandwidth in the frequency domain.
The radio frame may have a certain number of subframes of a predefined length, e.g., 2
subframes with a length of 1 millisecond. Each subframe may include two slots of a number of
OFDM symbols depending on the cyclic prefix (CP) length. IN SG, each slot consists of 14
OFDM symbols or 12 OFDM symbols based on normal CP and extended CP respectively. A
35 frame may also consist of a smaller number of OFDM symbols, e.g. when utilizing shortened
transmission time intervals (TTis) or a mini-slot/non-slot-based frame structure comprising just
a few OFDM symbols. Slot aggregation is supported in SG NR and hence data transmission
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can be scheduled to span one or multiple slots. Slot format indication informs a UE whether
an OFDM symbol is downlink, uplink or flexible.
The wireless communication network system may be any single-tone or multicarrier system
5 using frequency-division multiplexing, like the orthogonal frequency-division multiplexing
(OFDM) system, the orthogonal frequency-division multiple access (OFDMA) system, or any
other IFFT-based signal with or without CP, e.g. DFT-OFDM. Other waveforms, like nonorthogonal
waveforms for multiple access, e.g. filter-bank multicarrier (FBMC), generalized
frequency division multiplexing (GFDM) or universal filtered multi carrier (UFMC), may be
10 used. The wireless communication system may operate, e.g., in accordance with the LTEAdvanced
pro standard or the SG or NR (New Radio) standard.
The wireless communications network system depicted in Figure 1 may by a heterogeneous
network having two distinct overlaid networks, a network of macro cells with each macro cell
15 including a macro base station, like base station gNB1 to gNB3, and a network of small cell
base stations (not shown in Figure 1), like femto- or pico-base stations. In addition to the above
described wireless network also non-terrestrial wireless communication networks exist
including spaceborne transceivers, like satellites, and/or airborne transceivers, like unmanned
aircraft systems. The non-terrestrial wireless communication network or system may operate
20 in a similar way as the terrestrial system described above with reference to Figure 1, for
example in accordance with the L TE-advanced pro standard or the SG or NR, standard.
In 3GPP NR i.e. SG, and its further releases [1-6], downlink (DL) channel state information
(CSI) reporting by a UE to a network node (for e.g., a gNodeB, gNB) aids the scheduling of the
25 physical downlink shared channel (POSCH). Downlink reference signals (RSs) such as the
channel state information reference signal (CSI-RS) and the synchronization signal/physical
broadcast channel (SS/PBCH) block (SSB), which can be referred to as CSI resources, are
used to evaluate the link between the UE and the network node, and the UE provides CSI
feedback to the network node on the physical uplink control channel (PUCCH) or the physical
30 uplink shared channel (PUSCH), wherein the CSI is obtained from measurements of the
reference signals.
In millimeter wave (mmWave) frequencies (frequency range 2 (FR2)), i.e., frequencies above
6 GHz, in general, wireless communication between communication devices is performed with
35 spatially selective/directive transmissions and receptions called beams. The term 'beam' is
used in the following to denote a spatially selective/directive transmission of an outgoing signal
or reception of an incoming signal which is achieved by preceding/filtering the signal at the
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antenna ports of the device with a set of coefficients. The word preceding or filtering may refer
to processing of the signal in the analog or digital domain. The set of coefficients used to
spatially direct a transmission/reception in a certain direction may differ from one direction to
another direction. The term 'Tx beam' denotes a spatially selective/directive transmission and
5 the term 'Rx beam' denotes a spatially selective/directive reception. The set of coefficients
used to precede/filter the transmission or reception is denoted by the term 'spatial filter'. The
term 'spatial filter' is used interchangeably with the term 'beam direction' in this document as
the spatial filter coefficients determine the direction in which a transmission/reception is
spatially directed to.
10
The term 'higher layer' in the following, when used in isolation, denotes any communication
layer above the physical layer in the protocol stack.
In this disclosure, the term 'frequency bands' may be used to denote any set of frequency
15 domain resources. It may not necessarily denote a frequency band around a specific carrier
frequency as defined in the specifications.
The term serving cell and carrier component (CC) may be used interchangeably in this
disclosure as a serving cell configured for a UE and is usually a separate physical carrier with
20 a certain carrier frequency. Depending on the frequency of a component carrier/serving cell,
the size of the cell and the beamformed reference signals may vary. Each serving cell or
component carrier comprises N8wp 2: 1 bandwidth parts (BWP) which is a set of frequency
domain resources. At any given time instant in a serving cell, the UE may receive physical
layer transmissions from a TRP or any other network element in at least one of the configured
25 BWPs in the DL in the cell and may perform transmissions in at least one of the configured
BWPs in the UL in the cell.
In the following, the state of the art (SoT A) on CSI reporting and CSI resource configuration is
provided. The issues to be considered in multi-TRP/panel or multi-band communications and
30 the necessary enhancements are provided thereafter.
It is to be noted that any mention of an action performed by a gNodeB (gNB) can also be
performed by any other element of the network and hence any concerned statement shall be
read as such.
It is also to be noted that the aspects and the discussions herein concerning multiple transmit-
35 receive-points (TRPs) in the disclosure also apply to the scenarios where multiple panels from
one or more base stations (gNBs/TRPs) are involved instead of multiple TRPs.
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Below is described the prior art with respect to the physical downlink control and shared
channels, CSI reporting and transmission configuration indication in the downlink (DL).
PHYSICAL LAYER DOWNLINK SHARED AND CONTROL CHANNELS
5 The physical downlink control channel (PDCCH) and the physical downlink shared channel
(POSCH) carry the DL control information and DL data, respectively, to a UE [1-6]. The PDCCH
is configured at the radio resource control (RRC) layer level by a base station or a network
node or gNodeB (gNB). The gNB transmits the PDCCH(s) on one or more control resource
sets (CORESETs) that are configured at RRC level as shown in Figure 2. A CORESET is a
10 set of resources where control information may be transmitted to the UE. A CORESET
comprises of N~gRESET resource blocks (RBs) in the frequency domain (given by the higher
layer parameter frequencyOomainResources) and N5~~;sET E {1,2,3} symbols in the time
domain (given by the higher layer parameter duration). The UE may be configured with up to
3 CORESETs per BWP per serving cell [1]. PDCCH(s) carrying a downlink control information
15 (DCI) for one of the following purposes may be transmitted on the CORESETs:
• scheduling of the POSCH or the PUSCH or NR/L TE sidelink channel, or
• slot format indication, or
• power control command transmission, or
20 • cancelling of UL transmission, or
• power saving information notification, or
• soft resources availability notification, among others.
Depending on the purpose of the DCI, the DCI may have various formats. For example, the
25 information for the scheduling of the POSCH is provided via a DCI with format 1_0 or 1_1 to
the UE. Each DCI format has a specific number of fields in it and each field has a specific size.
The size of some of the fields may be determined via the configuration of higher layer
parameters. Upon the detection of a valid DCI with a specific format, the UE executes the
instructions for which the DCI was intended. For instance, upon the detection of a DCI format
30 1_0 or 1_1 about the scheduling of a POSCH, the UE receives and processes the POSCH
according to the settings provided in the DCI.
It should be noted that the terms PDCCH and DCI may be used interchangeably in this
disclosure. Both terms refer to a downlink control channel information obtained via the physical
35 layer.
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CHANNEL STATE INFORMATION FRAMEWORK
Channel state information (CSI) is provided by the UE to a network node (or gNB) after the
measurement of certain CSI resources in the downlink which may be used for the adaptation
5 of the transmission parameters on the link according to the channel conditions. In the DL, the
CSI resources are CSI-RS and SSB resources. These DL RS resources from which the CSI is
calculated by the UE are configured by the network node. The UE performs measurements on
the DL RS resources according to the instructions provided by the network node or according
to the instructions fixed in the specifications and the UE provides CSI quantities the network
10 node has indicated to report in the CSI report. The CSI report may comprise one or more of
the following CSI quantities:
15
20
25
CSI-RS resource indicator (CRI)
SSB resource indicator (SSBRI)
Layer 1 (L 1), i.e., physical layer- Reference Signal Received Power (RSRP)
Layer 1 (L 1), i.e., physical layer- Signal to Interference plus Noise Ratio (SINR)
Precoder Matrix Indicator (PMI)
Rank Indicator (RI)
Channel Quality Indicator (CQI)
Layer Indicator (LI)
The UE is provided via higher layer signaling with Nrep 2: 1 CSI report configurations/settings
(CSI-ReportConfig) and Nres 2: 1 CSI resource settings (CSI-ResourceConfig). Each CSI
resource setting, CSI-ResourceConfig, provides one or more of the following:
Non-zero-power CSI-RS (NZP CSI-RS) resource set(s) comprising one or more NZP
CSI-RS resources,
SSB resource set(s) comprising one or more SSB resources,
CSI interference management (CSI-IM) resource set(s) comprising one or more CSIIM
resources.
30 An NZP or SSB resource or a CSI-IM resource may comprise one or more ports. A CSI-IM
resource may also be referred to as zero-power (ZP) CSI-RS resource. The configuration of a
CSI-IM resource comprises a pattern of resource elements in a time-frequency grid. These
resource elements are transmitted with zero power, and intra- and inter-cell interference and/or
noise can be measured by the UE from these resource elements.
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For the evaluation of the CSI, the gNB (or network node) provides instructions to the UE or the
instructions are fixed in the specifications for measurement of various parameters from the
provided resources. The CSI measurement involves the measurement of a channel part and
an interference part (the part of the link that interferes with the UE's communication) to evaluate
5 various CSI quantities. The channel and the interference may be measured from different
set(s) or group(s) of resources. The interference may be measured from one or more CSI-IM
resources, or NZP-CSI-RS resources or SSB resources. The channel part may however be
measured only from NZP CSI-RS resources or SSB resources.
10 The information element that provides the CSI report configuration is shown below. Each CSI
report configuration(s) is linked with at least one, and up to three CSI resource settings, where
the three CSI resource settings provide the following:
15
NZP-CSI-RS or SSB resource(s) for channel measurement,
CSI-IM resource(s) for interference measurement, and
NZP-CSI-RS or SSB resource(s) for interference measurement.
REPORTING CONFIGURATIONS
The UE calculates the various CSI parameters or quantities indicated by the gNB for a CSI
report as provided in the higher layer parameter 'reportQuantity' or 'reportQuantity-r16' in the
5 report configuration. The parameters are dependent on each other, and the calculation of a
parameter may be conditioned on another parameter [4]:
10
Ll shall be calculated conditioned on the reported CQI, PMI, Rl and CRI
CQI shall be calculated conditioned on the reported PMI, Rl and CRI
PMI shall be calculated conditioned on the reported Rl and CRI
Rl shall be calculated conditioned on the reported CRI.
The CRI or SSBRI is the resource with respect to which the channel is measured and the
precoder (PMI), rank (RI) and the corresponding CQI (an indication of a 'suitable MCS'
(modulation and coding scheme) according to the specifications) provide the link parameters
15 with respect to this resource.
20
As observed in the configuration of the CSI report, at least the following aspects of the CSI
report are configurable by the gNB:
The CSI quantities to be reported by the UE,
The frequency granularity with which one or more of the CSI quantities are reported,
The time-domain behavior (aperiodic, semi-persistent and periodic) of the report,
The time-domain restriction for channel and interference measurement obtained for the
report.
Depending on the time-domain behavior of the report, the triggering, and the channel on which
25 the report is transmitted may vary. The following table (Table 1) from TS 38.214 [4] provides
an overview of the various time-domain behaviors supported by the 3GPP SG NR
specifications for CSI reporting and the associated CSI resources, the type of triggering or
activation for the report and the channels in the uplink used for the reporting. The medium
access control (MAC) layer or the physical layer may be used for the triggering or activation,
30 and if applicable, deactivation of the CSI reporting. The gNB transmits medium access control
- control element (MAC-CE) messages in the case of semi-persistent CSI reporting for the
activation or deactivation of the CSI report. The physical layer is used in the case of semipersistent
or aperiodic CSI reporting for the triggering and deactivation, if applicable.
DOWNLINK TRANSMISSION CONFIGURATION INDICATION
5 As previously described, the PDCCH and the POSCH carry the DL control information and DL
data, respectively, to a UE [1-6].
Demodulation reference signals (DMRS) are embedded for the coherent demodulation of the
PDCCH/PDSCH at the UE. The DMRS consists of a set of DMRS ports. The number of DMRS
10 ports determines the number of transmission layers contained in a POSCH. DMRS is used for
channel estimation at the UE to coherently demodulate the POSCH or PDCCH(s). In the case
of PDCCH, one or more of them may be transmitted on a CORESET. Therefore, the DMRS
for the coherent demodulation of the PDCCH(s) on the CORESET may be embedded across
the PDCCH(s) transmitted on the CORESET.
15 A parameter in the transmission of the PDCCH and the POSCH is known as the 'Transmission
Configuration Indication'- state (TCI-state) [4]. In 3GPP Rei. 16, the indication of how the
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control or the shared channel is transmitted by the gNB and what assumptions the UE must
consider while receiving them, is done via reference signals (RSs). The indication to the UE is
performed using a TCI-state information element (I E) configured via RRC, as illustrated in
Figure 3. A TCI-state IE, among others, comprises the following elements:
5 • One of more reference signal(s), and
• for each reference signal, one or more quasi-colocation (QCL) assumptions.
The TCI-state is used to mention how to receive a POSCH or the PDCCH(s) transmitted on a
CORESET. Applying a TCI-state to a POSCH or CORESET implies that the POSCH or the
10 PDCCH(s), transmitted on the CORESET, shall be assumed to be quasi-co-located with the
reference signals mentioned in the TCI-state.
Assuming 'quasi-colocation' means that certain channel parameters such as Doppler
shift/spread, delay spread, average delay and/or Tx beam direction are assumed to be the
same for the RS mentioned in the TCI-state and the POSCH, or the PDCCH(s) transmitted on
15 the CORESET. Four different QCL types can be indicated in 3GPP Rei. 16 [4]:
• 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}
• 'QCL-TypeB': {Doppler shift, Doppler spread}
• 'QCL-TypeC': {Doppler shift, average delay}
• 'QCL-TypeD': {Spatial Rx parameter}
20 One or more of the QCL-Info parameter(s) is/are included in the TCI-state IE to provide the
QCL assumption(s) associated with the TCI-state.
For example, a TCI-state IE comprising a DL reference signal (RS) 'A' with QCL assumption
'QCL-typeA' and a DL RS 'B' with QCL-assumption 'QCL-TypeD' is considered. Applying this
25 TCI-state to a POSCH or CORESET with the given quasi-colocation assumptions means that
the UE may assume the same Doppler shift, Doppler spread, average delay and delay spread
for the POSCH or the PDCCH(s) transmitted on the CORESET and DL RS 'A', and the UE
may use the same spatial filter to receive the DL RS 'B' and the POSCH or the PDCCH(s)
transmitted on the CORESET, or the Rx spatial filter to receive the PDCCH(s) on the
30 CORESET or the POSCH may be obtained from or be similar to that used for the reception of
the DL RS 'B'.
Usually, the TCI state that is used for a PDCCH or a POSCH contains the identifiers (IDs) of
channel state information reference signals (CSI-RS) or synchronization signal blocks (SSB)
along with the QCL assumptions for the reference signal. The RS in the TCI-state is usually a RS that the UE has measured before, so that it can use it as a reference to receive the DMRS
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of the POCCH or POSCH, and hence demodulate the same. The indication of a TCI-state for
a CO RESET or a POSCH is performed via MAC-CE messages or using the TCI-indication field
in the downlink control information (OCI) used to schedule the POSCH.

CLAIMS
1. A method performed by a user equipment, UE, the method comprising:
receiving (401), from a network node, a channel state information, CSI, report
configuration providing:
• N Non Zero Power, NZP, CSI reference signal, CSI-RS, or synchronization
signal/physical broadcast channel, SSB, resources associated with one or
more NZP CSI-RS or SSB resources sets for channel measurement, and
• one or more resources for interference measurement wherein the
resource(s) for interference measurement is/are CSI interference
management, CSI-IM, resources being Zero-Power CSI-RS resources
and/or NZP CSI-RS resources or SSB resources, and
• an indication of one or multiple subsets or combinations of the N resources
provided for channel measurement in the CSI report configuration
applying a Quasi-Colocation typeD, QCL, assumption with respect to a channel
measurement resource to measure one or more interference measurement resources
associated with the channel measurement resource, wherein the QCL-typeD
assumption is defined in the 3GPP specifications
providing (404), to the network node, a CSI report that comprises two parts- part 1
and part 2, and wherein the content contained in part 1 indicates the size of part 2;
wherein the CSI report contains a CSI-RS resource indicator, CRI, or a CRI field
indicating selected CSI-RS resource(s) associated with the CSI report, wherein the
CRI or CRI field is included in part 1 of the CSI report, and wherein the CRI or CRI
field is associated with a number of code-points, wherein each code-point is
associated with a combination or a subset of the CSI-RS resources which are
configured for channel measurement in the CSI report configuration; and the
association of the code-points to combinations of CSI-RS resources is configured
via a higher layer or it is a priori known to the UE and fixed in the 3GPP
specifications.
2. The method according to claim 1, wherein the CSI report includes one or more of the
following CSI quantities:
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-a synchronization signal/physical broadcast channel, SSB, resource identifier, SSBRI,
indicating a subset or a combination of SSB resources, out of the SSB resources
provided in the CSI report configuration, wherein each resource is associated with the
one or more CSI quantities in the CSI report,
-a rank indicator, Rl, indicating a combination of rank values for the subset of CSI-RS
resources in the CSI report,
-a channel quality indicator, CQI, indicating one or more CQI value(s) for the subset of
CSI-RS resources;
- a layer indicator, Ll, value, and
- a preceding matrix indicator, PM I, indicating one or more preceding matrices for the
subset of CSI-RS resources.
3. The method according to claim 1 or claim 2 further comprising, measuring the channel
using one or more of said reference signals, and measuring the corresponding interference
15 using said one or more resources from at least one of the following:
-a CSI-interference management, IM, resource,
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30
- one or more Non Zero Power, NZP, CSI-RS or SSB resources, or
- one or more NZP CSI-RS or SSB resources that are configured for interference
measurement.
4. The method according to any one of the preceding claims, wherein the CSI report
configuration is linked to one or more CSI resource settings, wherein the CSI report
configuration provides at least one of the following settings:
one or more CSI resource settings, each providing one or more set(s) of downlink RS
resource(s) for channel measurement,
one or more CSI resource settings, each providing one or more set(s) of CSI-IM
resource(s) for interference measurement,
one or more CSI resource settings, each providing one or more set(s) of DL RS
resource(s) for interference measurement.
5. The method according to claim 4 wherein the number of CSI resource settings for channel
measurements and/or the number of CSI resource settings for interference measurement
from CSI-IM resources and/or the number of CSI resource settings for interference
measurement from CSI-RS or SSB resources is equal to a number of frequency bands or
35 a number of transmit receive points, TRPs, the resources are associated with.
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6. The method according to any one of the preceding claims, wherein each CSI quantity is
associated with at least one of the M selected RS resources, and wherein the M selected
RS resources are indicated in the CSI report.
5 7. The method according to any one of the preceding claims, wherein the number of indicated
CSI-RS resources by the CRI determines the payload size of part 2 of the CSI report.
8. The method according to any one of the preceding claims, wherein the CSI report includes
a bitmap that indicates one or multiple subsets or resource combinations of resources
10 configured for channel measurement and are associated with the CSI quantities in the CSI
report.
9. The method according claim 1 wherein, the CRI or the CRI field is represented by
anrlogz (;) 1 or rlogz ( 2::= 1 (~)) 1 or rlog2 ( I:=o (~)) 1 bit indicator wherein each code-
15 point of the bit indicator is associated with a combination of m or M CSI-RS resources.
10. The method according to any of the preceding claims, wherein the CSI report contains a
rank indicator, Rl, indicating a combination of rank or Rl values for selected CSI-RS
resources associated with the CSI report, and the Rl indicating the selected rank values
20 for the CSI-RS resources associated with the CSI is included in part 1 of the CSI report.
25
11. The method according to claim 10 comprising, receiving, from the network node, a higher
layer parameter that indicates a rank restriction of a value obtained by a summation of said
Rl values.
12. The method according to claim 10, wherein the Rl or Rl field is associated with a number
of code-points, and each code-point of the Rl or Rl field indicates a combination of rank
values of the selected CSI-RS resources.
30 13. A method performed by a network node, the method comprising:
35
-transmitting (501), to a user equipment, UE, a channel state information, CSI, report
configuration which provides:
• N Non Zero Power, NZP, CSI reference signal, CSI-RS, or synchronization
signal/physical broadcast channel, SSB, resources associated with one or
more NZP CSI-RS or SSB resources sets for channel measurement, and
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• one or more resources for interference measurement wherein the
resource(s) for interference measurement is/are CSI interference
management, CSI-IM, resources being Zero-Power CSI-RS resources
and/or NZP CSI-RS resources or SSB resources, and
• an indication of one or multiple subsets or combinations of the N resources
provided for channel measurement in the CSI report configuration;
and enabling the UE to apply a Quasi-Colocation typeD, QCL, assumption with respect
to a channel measurement resource to measure one or more interference
measurement resources associated with the channel measurement resource, wherein
the QCL-typeD assumption is defined in the 3GPP specifications;
-receiving (502), from the UE, a CSI report wherein the CSI report comprises two parts
- part 1 and part 2 -, and wherein the content contained in part 1 indicates the size of
part 2; and
-decoding (503) part 1 of the CSI report for determining the payload size of part 2 of
the CSI report, allowing said network node to decode the CSI report;
wherein the CSI report contains a CSI-RS resource indicator, CRI, or a CRI field
included in part 1 of the CSI report, and wherein the CRI or CRI field is associated with
a number of code-points, wherein each code-point is associated with a combination or
a subset of the CSI-RS resources which are configured for channel measurement in
the CSI report configuration; and the association of the code-points to combinations of
CSI-RS resources is configured via a higher layer or it is a priori known to the UE and
fixed in the 3GPP specifications.
14. A User Equipment, UE, (600) comprising a processor (610) and a memory (620), said
memory (620) containing instructions executable by said processor (620) whereby said UE
30 (600) is operative to perform any one of the subject-matter of method claims 1-12.
15. A network node (700) comprising a processor (710) and a memory (720), said memory
(720) containing instructions executable by said processor (710) whereby said network
node (700) is operative to perform the subject-matter of method claim 13.