Granted Patent B2

US 12,634,081 · App. 18/245,853 · Granted May 19, 2026

Inventors: Chenxi Hao (Beijing, CN); Yu Zhang (San Diego, CA); Liangming Wu (Beijing, CN); Wei Xi (Beijing, CN); Hao Xu (Beijing, CN)

Assignee: QUALCOMM Incorporated

H04L5/0051H04W24/08

Abstract

Claims (93)

1 . A method for wireless communications by a user equipment (UE), comprising:

receiving information regarding a configuration of at least one channel state information (CSI) reference signal (RS) resource, wherein the configuration of each CSI-RS resource comprises one or more resource mapping configurations;

determining, from the information, resources for a first set of CSI-RS ports or code division multiplexing (CDM) groups within the CSI-RS resource based at least in part on a first resource mapping, and resources for a second set of CSI-RS ports or CDM groups within the CSI-RS resource based at least in part on the first resource mapping and a second resource mapping, wherein the first set of CSI-RS ports is different from the second set of CSI-RS ports; and

performing CSI measurement using the first and second sets of CSI-RS ports.

2 . The method of claim 1 , wherein the information comprises at least first and second resource mapping configurations that correspond to different resource mappings.

3 . The method of claim 2 , wherein:

each of the first and second resource mapping configuration indicates parameters including at least one of: a CDM type, number of ports, resource element (RE) positions within a resource block (RB), symbol position within a slot, and CSI-RS port density configuration; and

the first and second resource mapping configurations indicate different values for at least one of the parameters.

4 . The method of claim 3 , wherein the CSI port density configuration comprises a port density and an RB position when the density is smaller than 1.

5 . The method of claim 3 , wherein:

the first and second resource mapping configurations indicate same values for RE position and symbol position, but different CSI-RS port density configurations.

6 . The method of claim 1 , wherein:

the information comprises a first resource mapping configuration and additional information; and

the second resource mapping for the second set of CSI-RS ports or the second set of CDM groups is determined based on the additional information and one or more parameters indicated in the first resource mapping configuration.

7 . The method of claim 6 , wherein the first set of CSI-RS ports or CDM groups is determined based at least in part on the first resource mapping configuration of the information.

8 . The method of claim 6 , wherein:

the additional information comprises a number of additional resource mappings; and

determining a density and resource block (RB) comb for the second set of CSI-RS ports or the second set of CDM groups based on the number of additional resource mappings and a density and RB comb indicated in the first resource mapping configuration.

9 . The method of claim 1 , further comprising:

performing resource mapping based on CSI-RS port indexing starting from ports within each CDM group within each resource mapping, then across CDM groups in same resource mapping configuration, then across different resource mapping configurations.

10 . The method of claim 1 , wherein:

the information comprises a resource mapping configuration with sufficient information to determine the resources for the first set of CSI-RS ports or CDM groups and the resources for the second set of CSI-RS ports.

11 . The method of claim 1 , wherein the CSI-RS ports comprise at least 48 CSI-RS ports and occupy 12 resource elements (REs) and 4 symbols; and

the method further comprising:

for a first CDM configuration, receiving an indication of 6 RE locations and 2 symbol locations;

for a second CDM configuration, receiving an indication of 6 RE locations and 2 symbol locations; or

for a third CDM configuration, receiving an indication of 6 RE locations and 1 symbol location.

12 . The method of claim 1 , wherein the CSI-RS ports comprise at least 48 CSI-RS ports and occupy 8 resource elements (REs) and 6 symbols; and

the method further comprising:

for a first CDM configuration, receiving an indication of 4 RE locations and 3 symbol locations; or

for a second CDM configuration, receiving an indication of 4 RE locations and 3 symbol locations.

13 . The method of claim 1 , wherein the CSI-RS ports comprise at least 48 CSI-RS ports and occupy 6 resource elements (REs) and 8 symbols; and

the method further comprises:

for a first CDM configuration, receiving an indication of 3 RE locations and 2 or 4 symbol locations;

for a second CDM configuration, receiving an indication of 3 RE locations and 2 or 4 symbol locations; and

for a third CDM configuration, receiving an indication of 3 RE locations and 2 symbol locations.

14 . The method of claim 1 , wherein the CSI-RS ports comprise at least 64 CSI-RS ports and occupy 8 resource elements (REs) and 8 symbols; and

the method further comprising:

for a first CDM configuration, receiving an indication of 4 RE locations and 2 or 4 symbol locations;

for a second CDM configuration, receiving an indication of 4 RE locations and 2 or 4 symbol locations; or

for a third CDM configuration, receiving indication of 4 RE locations and 2 symbol location.

15 . A method for wireless communications by a network entity, comprising:

transmitting, to a user equipment (UE), information regarding a configuration of at least one channel state information (CSI) reference signal (RS) resource, wherein the configuration of each CSI-RS resource comprises one or more resource mapping configurations;

transmitting CSI-RS, in accordance with the information, on resources for a first set of CSI-RS ports or code division multiplexing (CDM) groups within the CSI-RS resource based at least in part on a first resource mapping, and on resources for a second set of CSI-RS ports or CDM groups within the resource based at least in part on the first resource mapping and a second resource mapping, wherein the first set of CSI-RS ports is different from the second set of CSI-RS ports; and

receiving, from the UE, a report based on CSI measurement using the first and second sets of CSI-RS ports.

16 . The method of claim 15 , wherein the information comprises at least first and second resource mapping configurations that correspond to different resource mappings.

17 . The method of claim 16 , wherein:

each of the first and second resource mapping configuration indicates parameters including at least one of: a CDM type, number of ports, resource element (RE) positions within a resource block (RB), symbol position within a slot, and CSI-RS port density configuration; and

the first and second resource mapping configurations indicate different values for at least one of the parameters.

18 . The method of claim 17 , wherein the CSI port density configuration comprises a port density and an RB position when the density is smaller than 1.

19 . The method of claim 17 , wherein:

the first and second resource mapping configurations indicate same values for RE position and symbol position, but different CSI-RS port density configurations.

20 . The method of claim 15 , wherein:

the information comprises a first resource mapping configuration and additional information; and

a second resource mapping for the second set of CSI-RS ports or the second set of CDM groups is determined based on the additional information and one or more parameters indicated in the first resource mapping configuration.

21 . The method of claim 20 , wherein the first set of CSI-RS ports or CDM groups is determined based at least in part on the first resource mapping configuration of the information.

22 . The method of claim 20 , wherein:

the additional information comprises a number of additional resource mappings; and

the configuration information indicates a density and resource block (RB) comb for the second set of CSI-RS ports or the second set of CDM groups based on the number of additional resource mappings and a density and RB comb indicated in the first resource mapping configuration.

23 . The method of claim 15 , further comprising configuring the UE to perform resource mapping based on CSI-RS port indexing starting from ports within each CDM group within each resource mapping, then across CDM groups in same resource mapping configuration, then across different resource mapping configurations.

24 . The method of claim 15 , wherein:

the information comprises a resource mapping configuration with sufficient information to determine the resources for the first set of CSI-RS ports or CDM groups and the resources for the second set of CSI-RS ports.

25 . The method of claim 15 , wherein the CSI-RS ports comprise at least 48 CSI-RS ports and occupy 12 resource elements (REs) and 4 symbols; and

the method further comprising:

for a first CDM configuration, transmitting an indication of 6 RE locations and 2 symbol locations;

for a second CDM configuration, transmitting an indication of 6 RE locations and 2 symbol locations; or

for a third CDM configuration, transmitting an indication of 6 RE locations and 1 symbol location.

26 . The method of claim 15 , wherein the CSI-RS ports comprise at least 48 CSI-RS ports and occupy 8 resource elements (REs) and 6 symbols; and

the method further comprising:

for a first CDM configuration, transmitting an indication of 4 RE locations and 3 symbol locations; or

for a second CDM configuration, transmitting an indication of 4 RE locations and 3 symbol locations.

27 . The method of claim 15 , wherein the CSI-RS ports comprise at least 48 CSI-RS ports and occupy 6 resource elements (REs) and 8 symbols; and

the method further comprises:

for a first CDM configuration, transmitting an indication of 3 RE locations and 2 or 4 symbol locations;

for a second CDM configuration, transmitting an indication of 3 RE locations and 2 or 4 symbol locations; and

for a third CDM configuration, transmitting an indication of 3 RE locations and 2 symbol locations.

28 . The method of claim 15 , wherein the CSI-RS ports comprise at least 64 CSI-RS ports and occupy 8 resource elements (REs) and 8 symbols; and

the method further comprising:

for a first CDM configuration, transmitting an indication of 4 RE locations and 2 or 4 symbol locations;

for a second CDM configuration, transmitting an indication of 4 RE locations and 2 or 4 symbol locations; or

for a third CDM configuration, transmitting indication of 4 RE locations and 2 symbol location.

29 . An apparatus for wireless communications by at a user equipment (UE), comprising:

a memory comprising instructions; and

one or more processors, individually or collectively, configured to execute the instructions to cause the UE to:

receive information regarding a configuration of at least one channel state information (CSI) reference signal (RS) resource, wherein the configuration of each CSI-RS resource comprises one or more resource mapping configurations;

determine, from the information, resources for a first set of CSI-RS ports or code division multiplexing (CDM) groups within the CSI-RS resource based at least in part on a first resource mapping, and resources for a second set of CSI-RS ports or CDM groups within the resource based at least in part on the first resource mapping and a second resource mapping, wherein the first set of CSI-RS ports is different from the second set of CSI-RS ports; and

perform CSI measurement using the first and second sets of CSI-RS ports.

30 . An apparatus for wireless communications by at a network entity, comprising:

a memory comprising instructions; and

one or more processors, individually or collectively, configured to execute the instructions to cause the network entity to:

transmit, to a user equipment (UE), information regarding a configuration of at least one channel state information (CSI) reference signal (RS) resource, wherein the configuration of each CSI-RS resource comprises one or more resource mapping configurations;

transmit CSI-RS, in accordance with the information, on resources for a first set of CSI-RS ports or code division multiplexing (CDM) groups within the CSI-RS resource based at least in part on a first resource mapping, and on resources for a second set of CSI-RS ports or CDM groups within the resource based at least in part on the first resource mapping and a second resource mapping, wherein the first set of CSI-RS ports is different from the second set of CSI-RS ports; and

receive, from the UE, a report based on CSI measurement using the first and second sets of CSI-RS ports.

Assignments (1)

Continuity (1)

References Cited (16)