TRP subset selection and reporting
Apparatuses and methods for transmit-receive point (TRP) subset selection and reporting. A method performed by a user equipment (UE) is provided. The method includes receiving information about a channel state information (CSI) report. The information indicates N>1 groups of CSI reference signal (CSI-RS) ports and a list of S states. Each of the S states correspond to a subset of the N groups of CSI-RS ports. The method further includes, based on the information, selecting at least one state from the list of S states, measuring at least one of the N groups of CSI-RS ports, and determining CSI based on the measurement. The method further includes transmitting the CSI report including the determined CSI.
1 . A user equipment (UE) comprising:
a transceiver configured to receive information about a channel state information (CSI) report, the information indicating:
N>1 groups of CSI reference signal (CSI-RS) ports, and
a list of S states, wherein each of the S states correspond to a subset of the N groups of CSI-RS ports; and
a processor operably coupled to the transceiver, the processor, based on the information, configured to:
select at least one state from the list of S states,
measure at least one of the N groups of CSI-RS ports, and
determine CSI based on the measurement,
wherein the transceiver is further configured to transmit the CSI report including the determined CSI.
2 . The UE of claim 1 , wherein each of the N groups of CSI-RS ports is associated with a respective non-zero power (NZP) CSI-RS resource.
3 . The UE of claim 1 , wherein a value of S is less than or equal to N or 2 N −1.
4 . The UE of claim 1 , wherein:
the CSI report further includes an indicator indicating the at least one selected state, and
the indicator is of bit-width
⌈
log
2
(
S
S
s
e
l
)
⌉
,
where S sel is a number of the at least one selected state.
5 . The UE of claim 1 , wherein the transceiver is further configured to receive, via downlink control information (DCI), information about the at least one state to select.
6 . The UE of claim 1 , wherein:
the transceiver is further configured to receive a medium-access-control control-element (MAC-CE) that activates a subset of the S states, and
the MAC-CE is a S-bit bit-map parameter.
7 . The UE of claim 6 , wherein:
the at least one state is selected based on the subset of activated states,
the CSI report includes an indicator indicating the at least one selected state, and
the indicator is of bit-width
⌈
log
2
(
S
activate
S
s
e
l
)
⌉
,
where S activate is a number of the activated states and S sel is a number of the at least one selected state.
8 . The UE of claim 6 , wherein:
the transceiver is further configured to receive, via downlink control information (DCI), information about the at least one state to select, and
the at least one selected state is based on the subset of activated states.
9 . A base station (BS) comprising:
a transceiver configured to:
transmit information about a channel state information (CSI) report, the information indicating:
N>1 groups of CSI reference signal (CSI-RS) ports, and
a list of S states, wherein each of the S states correspond to a subset of the N groups of CSI-RS ports; and
transmit, via downlink control information (DCI), information related to at least one state from the list of S states; and
receive the CSI report including CSI that is based on at least one of the N groups of CSI-RS ports.
10 . The BS of claim 9 , wherein each of the N groups of CSI-RS ports is associated with a respective non-zero power (NZP) CSI-RS resource.
11 . The BS of claim 9 , wherein a value of S is less than or equal to N or 2 N −1.
12 . The BS of claim 9 , wherein:
the CSI report further includes an indicator indicating the at least one state, and
the indicator is of bit-width
⌈
log
2
(
S
S
s
e
l
)
⌉
,
where S sel is a number of the at least one state.
13 . The BS of claim 9 , wherein the at least one of the N groups of CSI-RS ports corresponds to the at least one state.
14 . The BS of claim 9 , wherein:
the transceiver is further configured to transmit a medium-access-control control-element (MAC-CE) that activates a subset of the S states, and
the MAC-CE is a S-bit bit-map parameter.
15 . The BS of claim 14 , wherein:
the at least one state is from the subset of activated states,
the CSI report includes an indicator indicating the at least one state, and
the indicator is of bit-width
⌈
log
2
(
S
activate
S
s
e
l
)
⌉
,
where S activate is a number of the activated states and S sel is a number of the at least one state.
16 . The BS of claim 14 , wherein:
the DCI further includes information about the at least one state to select, and
the at least one selected state is from the subset of activated states.
17 . A method performed by a user equipment (UE), the method comprising:
receiving information about a channel state information (CSI) report, the information indicating:
N>1 groups of CSI reference signal (CSI-RS) ports, and
a list of S states, wherein each of the S states correspond to a subset of the N groups of CSI-RS ports;
based on the information, selecting at least one state from the list of S states;
measuring at least one of the N groups of CSI-RS ports;
determining CSI based on the measurement; and
transmitting the CSI report including the determined CSI.
18 . The method of claim 17 , wherein each of the N groups of CSI-RS ports is associated with a respective non-zero power (NZP) CSI-RS resource.
19 . The method of claim 17 , wherein a value of S is less than or equal to N or 2 N −1.
20 . The method of claim 17 , wherein:
the CSI report further includes an indicator indicating the at least one selected state, and
the indicator is of bit-width
⌈
log
2
(
S
S
s
e
l
)
⌉
,
where S sel is a number of the at least one selected state.