METHOD AND APPARATUS FOR REDUCED FEEDBACK MIMO

• US 20170134082A1
• Filed: 10/31/2016
• Published: 05/11/2017
• Est. Priority Date: 11/11/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Onggosanusi, Eko, Rahman, Md. Saifur, Kwak, Youngwoo
• Granted Patent: US 10,763,925 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0469 taking special antenna structures, e.g. cross polarized antennas into account
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/0486 taking channel rank into account
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04B 7/0647 Variable feedback rate
• CPC Class Codes: H04B 7/065 Variable contents, e.g. long-term or short-short
• CPC Class Codes: H04B 7/0682 using phase diversity (e.g. phase sweeping)
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 5/0023 Time-frequency-space

Abstract

Methods and apparatuses for CSI reporting mechanisms are provided. A user equipment (UE) includes a transceiver and a processor operably connected to the transceiver. The transceiver is configured to receive transmission scheme configuration information, codebook configuration information, and eMIMO-Type configuration information. The processor is configured to calculate, in response to receipt of configuration information that indicates an open-loop diversity operation, a first precoding matrix indicator (PMI) i₁ from a codebook. The codebook includes two PMIs i₁ and i₂ and is determined based on the codebook configuration information. The transceiver is further configured to report the first PMI i₁ by transmitting the first PMI i₁ on an uplink channel.

Claims

1. A user equipment (UE) comprising:

a transceiver configured to receive transmission scheme configuration information, codebook configuration information, and eMIMO-Type configuration information; and

a processor operably connected to the transceiver, the processor configured to calculate, in response to receipt of at least one of the transmission scheme configuration information, the codebook configuration information, and the eMIMO-Type configuration information that indicates an open-loop diversity operation, a first precoding matrix indicator (PMI) i₁ from a codebook;

wherein the codebook includes two PMIs i₁ and i₂ and is determined based on the codebook configuration information; and

wherein the transceiver is further configured to report the first PMI i₁ by transmitting the first PMI i₁ on an uplink channel.

2. The UE of claim 1, wherein:

the processor is further configured to calculate a rank indicator (RI) and channel quality indicator (CQI) wherein the first PMI i₁ is calculated conditioned on a last reported RI; and

the transceiver is further configured to report the RI and CQI by transmitting the RI and the CQI on the uplink channel.

3. The UE of claim 2, wherein the CQI is calculated conditioned on the last reported RI and a last reported first PMI i₁.

4. The UE of claim 3, wherein the first PMI i₁ includes at least two codebook indices i_1,1 and i_1,2.

5. The UE of claim 2, wherein the CQI is calculated conditioned on the last reported RI and assuming a downlink transmission with cycling across at least two precoders from the codebook associated with a last reported first PMI i₁.

6. The UE of claim 2, wherein the transceiver is further configured to report a codebook configuration indicator.

7. The UE of claim 1, wherein the eMIMO-Type configuration information indicates a Class A eMIMO-Type.

8. A base station (BS) comprising:

a processor configured to;

generate configuration information to configure a user equipment (UE) with a transmission scheme, a codebook, and an eMIMO-Type; and

a transceiver operably connected to the processor, the transceiver configured to;

transmit, to the UE, the configuration information;

transmit, to the UE, data with open-loop diversity; and

receive a report including a first precoding matrix indicator (PMI) i₁ on an uplink channel;

wherein the first PMI i₁ is calculated from the codebook that includes two PMIs i₁ and i₂, and is determined based on the configuration information for the codebook.

9. The BS of claim 8, wherein:

the transceiver is further configured to receive a rank indicator (RI) and channel quality indicator (CQI) on the uplink channel, and

the first PMI i₁ is calculated conditioned on a last reported RI.

10. The BS of claim 9, wherein the CQI is calculated conditioned on the last reported RI and a last reported first PMI i₁.

11. The BS of claim 9, wherein the CQI is calculated conditioned on the last reported RI and assuming a downlink transmission with cycling across at least two precoders from the codebook associated with a last reported first PMI i₁.

12. The BS of claim 9, wherein the transceiver is configured to transmit the data with open-loop diversity based on transmission of the data across at least two precoders cycled in frequency domain.

13. The BS of claim 8, wherein the configuration information for the eMIMO-Type indicates a Class A eMIMO-Type.

14. A method for operating a user equipment (UE), the method comprising:

receiving, by the UE, transmission scheme configuration information, codebook configuration information, and eMIMO-Type configuration information;

in response to receipt of at least one of the transmission scheme configuration information, the codebook configuration information, and the eMIMO-Type configuration information that indicates an open-loop diversity operation, calculating, by the UE, a first precoding matrix indicator (PMI) i₁ from a codebook that is determined based on the codebook configuration information and includes two PMIs i₁ and i₂; and

reporting the first PMI i₁ by transmitting the first PMI i₁ on an uplink channel.

15. The method of claim 14, further comprising:

calculating a rank indicator (RI) and channel quality indicator (CQI) wherein the first PMI i₁ is calculated conditioned on a last reported RI; and

reporting the RI and CQI by transmitting the RI and the CQI on the uplink channel.

16. The method of claim 15, wherein the CQI is calculated conditioned on the last reported RI and a last reported first PMI i₁.

17. The method of claim 16, wherein the first PMI i₁ includes at least two codebook indices i_1,1 and i_1,2.

18. The method of claim 15, wherein the CQI is calculated conditioned on the last reported RI and assuming a downlink transmission with cycling across at least two precoders from the codebook associated with a last reported first PMI i₁.

19. The method of claim 15, further comprising reporting a codebook configuration indicator.

20. The method of claim 14, wherein the eMIMO-Type configuration information indicates a Class A eMIMO-Type.