Legal claims defining the scope of protection, as filed with the USPTO.
1. For use in a wireless communication network, a base station comprising: a two dimensional (2D) antenna array comprising a number N of antenna elements configured in a 2D grid NH×NV, the 2D antenna array configured to communicate with at least one subscriber station; and a controller configured to transmit N channel-state-information reference-signal (CSI-RS) antenna ports (APs) associated with each of the N antenna elements, wherein the controller is configured to transmit at least two sets of CSI-RS APs and the at least one subscriber station derives and feeds back horizontal CSI (H-CSI) and vertical CSI (V-CSI) estimated by the at least one subscriber station receiving and processing the at least two sets of CSI-RS APs, and wherein a total number of CSI-RS APs is less than N.
2. The base station as set forth in claim 1, wherein the H-CSI comprises channel characteristics mainly associated with horizontally placed antenna elements estimated at the at least one subscriber station and includes horizontal channel quality indicator (CQI) (H-CQI), horizontal precoding matrix index (PMI) (H-PMI) and horizontal rank indicator (RI) (H-RI).
3. The base station as set forth in claim 1, wherein the V-CSI comprises channel characteristics mainly associated with vertically placed antenna elements estimated at the at least one subscriber station and includes vertical CQI (V-CQI), vertical PMI (V-PMI) and vertical RI (V-RI).
4. The base station as set forth in claim 1, wherein the controller is configured to multiplex a first set of CSI-RS APs and a second set of CSI-RS APs for the at least two sets of CSI-RS APs.
5. The base station as set forth in claim 4, wherein the multiplexer operation comprises one or more of: a time-domain multiplexing (TDM), code-domain multiplexing (CDM), frequency-domain multiplexing (FDM) and spatial-domain multiplexing (SDM) and wherein: when TDM multiplexing is applied, the controller is configured to transmit the CSI-RS corresponding to the at least two sets of CSI-RS APs at two different time locations comprising at least one of: in two different time slots, in two different subframes, in two different sets of OFDM symbols; when FDM multiplexing is applied, the controller is configured to transmit the CSI-RS corresponding to the at least two sets of CSI-RS APs at two different frequency or subcarrier locations; when CDM multiplexing is applied, the controller is configured to transmit the CSI-RS APs corresponding to the at least two sets of CSI-RS APs using two different orthogonal codes in the same time-frequency location; when SDM is applied, the controller is configured to transmit the CSI-RS APs corresponding to the at least two sets of CSI-RS APs in two different spatial beams and wherein the at least two sets of CSI-RS APs are differently scrambled using two different scrambling initializations; and when FDM/TDM multiplexing is applied, the controller is configured to transmit the CSI-RS APs corresponding to the at least two sets of CSI-RS APs at two different time-frequency location.
6. The base station as set forth in claim 1, wherein the at least two sets of CSI-RS APs comprise one of: A-CSI-RS AP and B-CSI-RS AP; a vertical CSI-RS AP and a horizontal CSI-RS AP; two horizontal CSI-RS APs; and a primary CSI-RS AP and a secondary CSI-RS AP.
7. A subscriber station configured to communicate with at least one base station using a multiple input multiple output (MIMO) communication, the subscriber station comprising: an antenna array configured to communicate with at least one base station; and processing circuitry configured to receive physical downlink shared channels (PDSCHs) from a two dimensional (2D) active antenna array at the at least one base station, the 2D active antenna array comprising a number N antenna elements; the processing circuitry further configured to estimate a horizontal channel state information (CSI) and vertical CSI associated with the N antenna elements, wherein the processing circuitry is configured to receive and process at least two sets of CSI-RS antenna ports (APs), and derive and feedback horizontal CSI (H-CSI) and vertical CSI (V-CSI) from the at least two sets of CSI-RS APs, wherein a total number of CSI-RS APs is less than N.
8. The subscriber station as set forth in claim 7, wherein the H-CSI comprises channel characteristics mainly associated with horizontally placed antenna elements estimated at the at least one subscriber station and includes horizontal channel quality indicator (CQI) (H-CQI), horizontal precoding matrix index (PMI) (H-PMI) and horizontal rank indicator (RI) (H-RI).
9. The subscriber station as set forth in claim 7, wherein the V-CSI comprises channel characteristics mainly associated with vertically placed antenna elements estimated at the at least one subscriber station and includes vertical CQI (V-CQI), vertical PMI (V-PMI) and vertical RI (V-RI).
10. The subscriber station as set forth in claim 7, a first set of CSI-RS and a second set of CSI-RS APs for the at least two sets of CSI-RS APs are multiplexed.
11. The subscriber station as set forth in claim 10, wherein the multiplexer operation comprises one or more of: a time-domain multiplexing (TDM), code-domain multiplexing (CDM), frequency-domain multiplexing (FDM) and spatial-domain multiplexing (SDM) and wherein: when TDM multiplexing is applied, the controller is configured to transmit the CSI-RS corresponding to the at least two sets of CSI-RS APs at two different time locations comprising at least one of: in two different time slots, in two different subframes, in two different sets of OFDM symbols; when FDM multiplexing is applied, the controller is configured to transmit the CSI-RS APs corresponding to the at least two sets of CSI-RS APs at two different frequency or subcarrier locations; when CDM multiplexing is applied, the controller is configured to transmit the CSI-RS APs corresponding to the at least two sets of CSI-RS APs using two different orthogonal codes in the same time-frequency location; when SDM is applied, the controller is configured to transmit the CSI-RS corresponding to the at least two sets of CSI-RS APs in two different spatial beams and wherein the at least two sets of CSI-RS APs are differently scrambled using two different scrambling initializations; and when FDM/TDM multiplexing is applied, the controller is configured to transmit the CSI-RS APs corresponding to the at least two sets of CSI-RS APs at two different time-frequency location.
12. The subscriber station as set forth in claim 7, wherein the at least two sets of CSI-RS APs comprise one of: A-CSI-RS AP and B-CSI-RS AP; a vertical CSI-RS AP and a horizontal CSI-RS AP; two horizontal CSI-RS APs; and a primary CSI-RS AP and a secondary CSI-RS AP.
13. For use in a wireless communication network, a method comprising: transmitting, from a two dimensional (2D) antenna array, N channel-state-information reference-signal (CSI-RS) antenna ports (APs), the 2D antenna array comprising a number N of antenna elements configured in a 2D grid NH×Nv, the CSI-RS APs associated with each of the N antenna elements, wherein transmitting comprises transmitting at least two sets of CSI-RS APs; and receiving a feedback signal from the at least one subscriber station, the feedback signal comprising horizontal CSI (H-CSI) and vertical CSI (V-CSI) estimated by the at least one subscriber station receiving and processing the at least two sets of CSI-RS APs, and wherein a total number of CSI-RS APs is less than N.
14. The method as set forth in claim 13, wherein the H-CSI comprises channel characteristics mainly associated with horizontally placed antenna elements estimated at the at least one subscriber station and includes horizontal CQI (H-CQI), horizontal PMI (H-PMI) and horizontal RI (H-RI).
15. The method as set forth in claim 13, wherein the V-CSI comprises channel characteristics mainly associated with vertically placed antenna elements estimated at the at least one subscriber station and includes vertical CQI (V-CQI), vertical PMI (V-PMI) and vertical RI (V-RI).
16. The method as set forth in claim 13, wherein transmitting comprises multiplexing a first set of CSI-RS and a second set of CSI-RS for the at least two sets of CSI-RS.
17. The method as set forth in claim 16, wherein multiplexing comprises one or more of: a time-domain multiplexing (TDM), code-domain multiplexing (CDM), frequency-domain multiplexing (FDM) and spatial-domain multiplexing (SDM) and wherein: when TDM multiplexing is applied, the controller is configured to transmit the CSI-RS corresponding to the at least two sets of CSI-RS APs at two different time locations comprising at least one of: in two different time slots, in two different subframes, in two different sets of OFDM symbols; when FDM multiplexing is applied, the controller is configured to transmit the CSI-RS corresponding to the at least two sets of CSI-RS APs at two different frequency or subcarrier locations; when CDM multiplexing is applied, the controller is configured to transmit the CSI-RS corresponding to the at least two sets of CSI-RS APs using two different orthogonal codes in the same time-frequency location; when SDM is applied, the controller is configured to transmit the CSI-RS corresponding to the at least two sets of CSI-RS APs in two different spatial beams and wherein the at least two sets of CSI-RS APs are differently scrambled using two different scrambling initializations; and when FDM/TDM multiplexing is applied, the controller is configured to transmit the CSI-RS corresponding to the at least two sets of CSI-RS APs at two different time-frequency location.
18. The method as set forth in claim 13, wherein the at least two sets of CSI-RS APs comprise one of: A-CSI-RS and B-CSI-RS; a vertical CSI-RS AP and a horizontal CSI-RS AP; two horizontal CSI-RS APs; and a primary CSI-RS AP and a secondary CSI-RS AP.
19. A method for receiving channel state information reference signals (CSI-RSs), the method comprising: receiving at least two CSI-RS configurations indicating a first codebook for a first of the at least two CSI-RS configurations and a second codebook for a second of the at least two CSI-RS configurations, wherein a number of antenna ports is the same for both of the at least two CSI-RS configurations; identifying the number of antenna ports, the number of antenna ports associated with multiplexing of CSI-RSs for the at least two CSI-RS configurations in a subframe; and receiving CSI-RSs in the subframe based on the number of antenna ports.
20. The method of claim 19, wherein one subframe configuration is set for both of the at least two CSI-RS configurations.
21. The method of claim 19, wherein a resource configuration for each of the at least two CSI-RS configurations is set respectively.
22. A user equipment for receiving channel state information reference signals (CSI-RSs), the user equipment comprising: a transceiver configured to receive at least two CSI-RS configurations indicating a first codebook for a first of the at least two CSI-RS configurations and a second codebook for a second of the at least two CSI-RS configurations, wherein a number of antenna ports is the same for both of the at least two CSI-RS configurations; and a processor configured to identify a number of antenna ports, the number of antenna ports associated with multiplexing of CSI-RSs for the at least two CSI-RS configurations in a subframe, wherein the transceiver is configured to receive CSI-RSs in the subframe based on the number of antenna ports.
23. The user equipment of claim 22, wherein one subframe configuration is set for both the at least two CSI-RS configurations.
24. The user equipment of claim 22, wherein a resource configuration for each of the at least two CSI-RS configurations is set respectively.
25. A method for transmitting channel state information reference signals (CSI-RSs), the method comprising: transmitting at least two CSI-RS configurations indicating a first codebook for a first of the at least two CSI-RS configurations and a second codebook for a second of the at least two CSI-RS configurations, and wherein a number of antenna ports is associated with multiplexing of CSI-RSs for the at least two CSI-RS configurations in a subframe, and wherein the number of antenna ports is the same for both of the at least two CSI-RS configurations; and transmitting CSI-RSs in the subframe based on the number of antenna ports.
26. The method of claim 25, wherein one subframe configuration is set for both of the at least two CSI-RS configurations.
27. The method of claim 25, wherein a resource configuration for each of the at least two CSI-RS configurations is set respectively.
28. A base station for transmitting channel state information reference signals (CSI-RSs), the base station comprising: a transceiver configured to transmit at least two CSI-RS configurations indicating a first codebook for a first of the at least two CSI-RS configurations and a second codebook for a second of the at least two CSI-RS configurations, wherein a number of antenna ports is associated with multiplexing of CSI-RSs for the at least two CSI-RS configurations in a subframe, and wherein the number of antenna ports is the same for both of the at least two CSI-RS configurations, and transmit CSI-RSs in the subframe based on the number of antenna ports.
29. The base station of claim 28, wherein one subframe configuration is set for both the at least two CSI-RS configurations.
30. The base station of claim 28, wherein a resource configuration for each of the at least two CSI-RS configurations is set respectively.
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April 8, 2025
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