Method and apparatus for channel quality reporting
Apparatuses and methods for channel quality reporting are provided. A method for operating a user equipment (UE) includes receiving a configuration about a channel state information (CSI) report. The configuration includes information about N g >1 groups of CSI reference signal (CSI-RS) ports. The method further includes, based on the configuration, measuring the N g groups of CSI-RS ports, identifying K≥1 hypotheses for the CSI report, and determining the CSI report based on the K hypotheses. The method further includes transmitting the CSI report. The CSI report corresponds to υ≥1 layers.
1 . A user equipment (UE) comprising:
a transceiver configured to receive a configuration about a channel state information (CSI) report, the configuration including information about N g >1 groups of CSI reference signal (CSI-RS) ports; and
a processor operably coupled to the transceiver, the processor, based on the configuration, configured to:
measure the N g groups of CSI-RS ports,
identify K≥1 hypotheses for the CSI report, and
determine the CSI report based on the K hypotheses,
wherein:
the transceiver is further configured to transmit the CSI report, the CSI report corresponds to υ≥1 layers,
the configuration includes information about a codebook,
the codebook includes a first component and a second component,
the first component includes P≥2 sets of basis vectors including a first set for spatial domain (SD) and a second set for frequency domain (FD),
the second component includes coefficients associated with each basis vector combination (v 1 , v 2 , . . . , v P ), where v k belongs to a k-th set of basis vectors and k=1, . . . , P, and
the CSI report includes one or multiple basis vector indicators indicating all or a portion of the first component and one of multiple coefficient indicators indicating all or a portion of the second component.
2 . The UE of claim 1 , wherein the K hypotheses correspond to a same transmission which is one of a single point transmission (SPT), a non-coherent joint transmission (NCJT), or a coherent joint transmission (CJT), where:
SPT corresponds to a CSI for one of the N g groups of CSI-RS ports,
NCJT corresponds to a CSI across a multiple of the N g groups of CSI-RS ports such that one group is used for each layer, and
CJT corresponds to a CSI across the multiple of the N g groups of CSI-RS ports such that the multiple groups are used for each layer.
3 . The UE of claim 1 , wherein each of the N g groups of CSI-RS ports is associated with a respective non-zero power (NZP) CSI-RS resource.
4 . The UE of claim 1 , wherein:
to identify the K hypotheses, the processor is further configured to select the K hypotheses from a single point transmission (SPT), a non-coherent joint transmission (NCJT), or a coherent joint transmission (CJT), and
the CSI report includes at least one indicator indicating the selected K hypotheses.
5 . The UE of claim 1 , wherein:
the transceiver is further configured to receive information about the K hypotheses via the configuration, a medium access control-control element (MAC-CE), or a downlink control information (DCI), and
the processor is further configured to identify the K hypotheses based on the received information.
6 . The UE of claim 1 , wherein:
the processor is further configured to:
select Z out of the N g groups, where Z is more than one, and
determine the CSI report for the selected Z groups, and
the CSI report includes at least one indicator indicating the selected Z groups.
7 . The UE of claim 1 , wherein:
when K>1, the CSI report includes I≥1 indicators from a CSI-RS resource indicator (CRI), a layer indicator (LI), a rank indicator (RI), a precoding matrix indicator (PMI), or a channel quality indicator (CQI), and
(i) the I indicators are for each of the K hypotheses or (ii) at least one of the I indicators is for each of the K hypotheses and remaining ones of the I indicators are for one of the K hypotheses.
8 . The UE of claim 1 , wherein, when P=3:
the first component corresponds to 3 sets of basis vectors: the first set for SD, the second set for FD, and a third set for Doppler or time domain (DD/TD), and
the second component corresponds to coefficients associated with each basis vector triple (v 1 , v 2 , v 3 )=(a i , b f , c d ), where a i is an i-th basis vector from the first set, b f is a f-th basis vector from the second set, and c d is a d-th basis vector from the third set.
9 . The UE of claim 1 , wherein a number of CSI-RS ports is the same in all of the N g groups or a number of CSI-RS ports in at least one of the N g groups is different from number of CSI-RS ports in others of the N g groups.
10 . A base station (BS) comprising:
a processor configured to generate a configuration about a channel state information (CSI) report, the configuration including information about N g >1 groups of CSI reference signal (CSI-RS) ports; and
a transceiver operably coupled to the processor, the transceiver configured to:
transmit the configuration,
transmit CSI-RS on the N g groups of CSI-RS ports, and
receive the CSI report,
wherein:
the CSI report corresponds to υ≥1 layers and is based on K≥1 hypotheses,
the configuration includes information about a codebook,
the codebook includes a first component and a second component,
the first component includes P≥2 sets of basis vectors including a first set for spatial domain (SD) and a second set for frequency domain (FD),
the second component includes coefficients associated with each basis vector combination (v 1 , v 2 , . . . , v P ), where v k belongs to a k-th set of basis vectors and k=1, . . . , P, and
the CSI report includes one or multiple basis vector indicators indicating all or a portion of the first component and one of multiple coefficient indicators indicating all or a portion of the second component.
11 . The BS of claim 10 , wherein the K hypotheses correspond to a same transmission which is one of a single point transmission (SPT), a non-coherent joint transmission (NCJT), or a coherent joint transmission (CJT), where:
SPT corresponds to a CSI for one of the N g groups of CSI-RS ports,
NCJT corresponds to a CSI across a multiple of the N g groups of CSI-RS ports such that one group is used for each layer, and
CJT corresponds to a CSI across the multiple of the N g groups of CSI-RS ports such that the multiple groups are used for each layer.
12 . The BS of claim 10 , wherein each of the N g groups of CSI-RS ports is associated with a respective non-zero power (NZP) CSI-RS resource.
13 . The BS of claim 10 , wherein:
the K hypotheses correspond to a single point transmission (SPT), a non-coherent joint transmission (NCJT), or a coherent joint transmission (CJT), and
the CSI report includes at least one indicator indicating the K hypotheses.
14 . The BS of claim 10 , wherein the transceiver is further configured to transmit information about the K hypotheses via the configuration, a medium access control-control element (MAC-CE), or a downlink control information (DCI) to indicate the K hypotheses.
15 . A method for operating a user equipment (UE), the method comprising:
receiving a configuration about a channel state information (CSI) report, the configuration including information about N g >1 groups of CSI reference signal (CSI-RS) ports;
based on the configuration:
measuring the N g groups of CSI-RS ports;
identifying K≥1 hypotheses for the CSI report; and
determining the CSI report based on the K hypotheses; and
transmitting the CSI report,
wherein:
the CSI report corresponds to υ≥1 layers,
the configuration includes information about a codebook,
the codebook includes a first component and a second component,
the first component includes P≥2 sets of basis vectors including a first set for spatial domain (SD) and a second set for frequency domain (FD),
the second component includes coefficients associated with each basis vector combination (v 1 , v 2 , . . . , v P ), where v k belongs to a k-th set of basis vectors and k=1, . . . , P, and
the CSI report includes one or multiple basis vector indicators indicating all or a portion of the first component and one of multiple coefficient indicators indicating all or a portion of the second component.
16 . The method of claim 15 , wherein the K hypotheses correspond to a same transmission which is one of a single point transmission (SPT), a non-coherent joint transmission (NCJT), or a coherent joint transmission (CJT), where:
SPT corresponds to a CSI for one of the N g groups of CSI-RS ports,
NCJT corresponds to a CSI across a multiple of the N g groups of CSI-RS ports such that one group is used for each layer, and
CJT corresponds to a CSI across the multiple of the N g groups of CSI-RS ports such that the multiple groups are used for each layer.
17 . The method of claim 15 , wherein each of the N g groups of CSI-RS ports is associated with a respective non-zero power (NZP) CSI-RS resource.
18 . The method of claim 15 , wherein:
identifying the K hypotheses comprises selecting the K hypotheses from a single point transmission (SPT), a non-coherent joint transmission (NCJT), or a coherent joint transmission (CJT), and
the CSI report includes at least one indicator indicating the selected K hypotheses.
19 . The method of claim 15 , further comprising:
receiving information about the K hypotheses via the configuration, a medium access control-control element (MAC-CE), or a downlink control information (DCI),
wherein identifying the K hypotheses comprises identifying the K hypotheses based on the received information.