Port-selection codebook with frequency selective precoded CSI-RS
A configuration to configure a UE to receive a plurality of CSI-RS ports where different ports may be transmitted on different sets of RBs within the frequency band of the CSI-RS. The apparatus receives CSI-RS through a plurality of CSI-RS ports, wherein different CSI-RS ports of the plurality of CSI-RS ports are transmitted on a different set of RBs. The apparatus reports at least one CSI based on a CSI-RS pattern.
1 . An apparatus for wireless communication at a user equipment (UE), comprising:
memory; and
at least one processor coupled to the memory and configured to:
receive channel state information (CSI) reference signals (RS) (CSI-RS) through a plurality of CSI-RS ports, wherein different CSI-RS ports of the plurality of CSI-RS ports correspond to a different set of resource blocks (RBs); and
report at least one CSI based on a CSI-RS pattern, wherein the CSI-RS pattern corresponds to a port selection and a set of linear combination coefficients, wherein the port selection is based on a subset of a plurality of CSI-RS resources Ks, and wherein each CSI-RS resource in the subset corresponds to one of the different set of RBs, wherein the plurality of CSI-RS ports is within the plurality of CSI-RS resources Ks, Ks being an integer greater than or equal to two, wherein the CSI-RS ports within each resource is based on a corresponding set of RBs;
receive a configuration of a first resource having a full resource mapping configuration and one or more additional configurations; and
determine a resource mapping configuration for an additional resource based at least on the full resource mapping configuration and the one or more additional configurations.
2 . The apparatus of claim 1 , wherein the CSI-RS resource within the CSI-RS resource set comprises a plurality of parameters, wherein one parameter of the plurality of parameters for different resources within the Ks resources is different for each of the different resources.
3 . The apparatus of claim 2 , wherein the one parameter comprises a resource block (RB) comb, wherein each of the different resources within the Ks resources have a different RB comb.
4 . The apparatus of claim 1 , wherein aggregated resources of the Ks resources on a same resource block (RB) comb have a different resource element (RE) location or a different symbol location.
5 . The apparatus of claim 4 , wherein aggregated resources of the Ks resources on a different RB comb have at least one of a same resource element (RE) location, a same symbol location, or a same code division multiplexing (CDM) type.
6 . The apparatus of claim 1 , wherein the one or more additional configurations comprise at least one of resource element (RE) positions within a resource block for the additional resource, symbol positions within a slot for the additional resource, or a density or RB comb configuration for the additional resource.
7 . The apparatus of claim 1 , wherein the at least one processor is further configured to:
reindex the plurality of CSI-RS ports based on a resource index and a port index within the resource.
8 . The apparatus of claim 7 , wherein the at least one processor is further configured to reindex the plurality of CSI-RS ports based on at least one of across ports within one resource and across ports in different resources or across a first half of ports within a first resource and across a first half of ports within a second resource, across a second half of ports of the first resource and across a second half of ports of the second resource.
9 . The apparatus of claim 1 , wherein the at least one processor is further configured to:
receive a configuration of a first CSI-RS resource and an additional configuration comprising a number of resources Ks; and
determine a density configuration or an RB comb for each of the resources Ks based on a value of Ks and a density configuration and an RB comb configured for the first CSI-RS resource.
10 . The apparatus of claim 1 , wherein the CSI report configuration comprises a configuration for a CSI interference measurement (IM) (CSI-IM) associated with multiple channel measurement resources.
11 . The apparatus of claim 1 , wherein the CSI report configuration comprises Ks channel measurement resources used to generate a single CSI associated with Ks common CSI interference measurement (IM) (CSI-IM) resources.
12 . The apparatus of claim 1 , wherein the at least one processor is further configured to count the plurality of CSI-RS resources Ks which are used to calculate at least one CSI as a single CSI processing unit (CPU).
13 . The apparatus of claim 1 , wherein the at least one processor is further configured to count the plurality of CSI-RS resources Ks which are used to calculate at least one CSI as a single active CSI-RS resource, wherein the one active resource comprises Ks*P active ports, where P is a number of ports per CSI-RS resource Ks.
14 . The apparatus of claim 1 , wherein the plurality of CSI-RS ports includes N ports, the N ports are divided into M groups, with Ni ports in an i group of the M groups, and the CSI-RS ports for each group are transmitted on a corresponding set of RBs, wherein the plurality of CSI-RS ports is within one CSI-RS resource, and the M groups are within the one CSI-RS.
15 . A method of wireless communication of a user equipment (UE), comprising:
receiving channel state information (CSI) reference signals (RS) (CSI-RS) through a plurality of CSI-RS ports, wherein different CSI-RS ports of the plurality of CSI-RS ports correspond to a different set of resource blocks (RBs);
reporting at least one CSI based on a CSI-RS pattern, wherein the CSI-RS pattern corresponds to a port selection and a set of linear combination coefficients, wherein the port selection is based on a subset of a plurality of CSI-RS resources Ks, and wherein each CSI-RS resource in the subset corresponds to one of the different set of RBs, wherein the plurality of CSI-RS ports is within the plurality of CSI-RS resources Ks, Ks being an integer greater than or equal to two, wherein the CSI-RS ports within each resource is based on a corresponding set of RBs;
receiving a configuration of a first resource having a full resource mapping configuration and one or more additional configurations; and
determining a resource mapping configuration for an additional resource based at least on the full resource mapping configuration and the one or more additional configurations.
16 . An apparatus for wireless communication at a base station, comprising:
memory; and
at least one processor coupled to the memory and configured to:
transmit channel state information (CSI) reference signals (RS) (CSI-RS) through a plurality of CSI-RS ports, wherein different CSI-RS ports of the plurality of CSI-RS ports are transmitted on a different set of resource blocks (RBs;
receive at least one CSI report based on the transmitted CSI-RS, wherein the at least one CSI report corresponds to a port selection and a set of linear combination coefficients, wherein the port selection is based on a subset of a plurality of CSI-RS resources Ks, and wherein each CSI-RS resource in the subset corresponds to one of the different set of RBs wherein Ks being an integer greater than or equal to two; and
transmit, to a user equipment (UE), a configuration of a first resource having a full resource mapping configuration and one or more additional configurations, wherein the UE determines a resource mapping configuration for an additional resource based at least on the full resource mapping configuration and the one or more additional configurations.
17 . The apparatus of claim 16 , wherein the plurality of CSI-RS ports is within the plurality of CSI-RS resources Ks, Ks being an integer greater than or equal to two, wherein the CSI-RS ports within each resource is based on a corresponding set of RBs.
18 . The apparatus of claim 17 , wherein the CSI-RS resource within the CSI-RS resource set comprises a plurality of parameters, wherein one parameter of the plurality of parameters for different resources within the Ks resources is different for each of the different resources.
19 . The apparatus of claim 18 , wherein the one parameter comprises a resource block (RB) comb, wherein each of the different resources within the Ks resources have a different RB comb.
20 . The apparatus of claim 18 , wherein aggregated resources of the Ks resources on a same resource block (RB) comb have a different resource element (RE) location or a different symbol location.
21 . The apparatus of claim 18 , wherein aggregated resources of the Ks resources on a different RB comb have at least one of a same resource element (RE) location, a same symbol location, or a same code division multiplexing (CDM) type.
22 . The apparatus of claim 17 , wherein the plurality of CSI-RS resources Ks which are used to calculate at least one CSI correspond to a single active CSI-RS, wherein the one active resource comprises Ks*P active ports, where P is a number of ports per CSI-RS resource Ks.
23 . The apparatus of claim 16 , wherein the one or more additional configurations comprise at least one of resource element (RE) positions within a resource block for the additional resource, symbol positions within a slot for the additional resource, or a density configuration for the additional resource.
24 . The apparatus of claim 16 , wherein the at least one processor is further configured to:
transmit, to a user equipment (UE), a configuration of a first CSI-RS resource and a number of resources Ks, wherein the UE determines a density configuration or an RB comb for each of the resources Ks based on a value of Ks and a density configuration and an RB comb configured for the first CSI-RS resource.
25 . The apparatus of claim 16 , wherein the CSI report configuration comprises a configuration for a CSI interference measurement (IM) (CSI-IM) associated with multiple channel measurement resources.
26 . The apparatus of claim 16 , wherein the CSI report configuration comprises Ks channel measurement resources used to generate a single CSI associated with Ks common CSI interference measurement (IM) (CSI-IM) resources.
27 . A method of wireless communication of a base station (BS), comprising:
transmitting channel state information (CSI) reference signals (RS) (CSI-RS) through a plurality of CSI-RS ports, wherein different CSI-RS ports of the plurality of CSI-RS ports are transmitted on a different set of resource blocks (RBs); and
receiving at least one CSI report based on the transmitted CSI-RS, wherein the at least one CSI report corresponds to a port selection and a set of linear combination coefficients, wherein the port selection is based on a subset of a plurality of CSI-RS resources Ks, and wherein each CSI-RS resource in the subset corresponds to one of the different set of RBs, wherein Ks being an integer greater than or equal to two; and
transmitting, to a user equipment (UE), a configuration of a first resource having a full resource mapping configuration and one or more additional configurations, wherein the UE determines a resource mapping configuration for an additional resource based at least on the full resource mapping configuration and the one or more additional configurations.