USER EQUIPMENT AND METHODS FOR CODEBOOK SUBSAMPLING FOR ENHANCED 4TX CODEBOOKS

• US 20140355705A1
• Filed: 12/17/2013
• Published: 12/04/2014
• Est. Priority Date: 05/31/2013
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel IP Corporation (Intel Corporation)
• Inventors: Chen, Xiaogang, Zhu, Yuan, Li, Qinghua
• Granted Patent: US 9,071,297 B2
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• 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: H04L 27/20 Modulator circuits; Transmitter circuits
• CPC Class Codes: H04W 12/02 Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
• CPC Class Codes: H04W 12/75 Temporary identity
• CPC Class Codes: H04W 28/0289 Congestion control load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 92/24 between backbone network devices

Abstract

Embodiments of user equipment (UE) and methods for codebook subsampling for enhanced 4TX codebooks in 3GPP LTE wireless networks are generally described herein. In some embodiments, a physical uplink control channel (PUCCH) is configured for transmission of channel state information (CSI) feedback including a rank indicator (RI) and a precoding matrix (W1). The rank indicator (RI) and a precoding matrix (W1) are jointly encoded and codebook subsampling is performed for the enhanced 4Tx codebook for at least one of: PUCCH report type 5 (RI/1st PMI) in PUCCH 1-1 submode 1; PUCCH report type 2c (CQI/1st PMI/2nd PMI) in PUCCH 1-1 submode 2; and PUCCH report type 1a (subband CQI/2nd PMI) in PUCCH 2-1.

Claims

1. A method for codebook subsampling for enhanced 4TX codebooks in a 3GPP LTE network performed by user equipment (UE), the method comprising:

configuring a physical uplink control channel (PUCCH) for transmission of channel state information (CSI) feedback including a rank indicator (RI) and a precoding matrix (W1);

jointly encoding a rank indicator (RI) and a precoding matrix (W1); and

performing codebook subsampling for the enhanced 4Tx codebook for at least one of;

PUCCH report type 5 (RI/1st PMI) in PUCCH 1-1 submode 1;

PUCCH report type 2c (CQI/1st PMI/2nd PMI) in PUCCH 1-1 submode 2; and

PUCCH report type 1a (subband CQI/2nd PMI) in PUCCH 2-1.

2. The method of claim 1 wherein for the PUCCH report type 5 (RI/1st PMI) in PUCCH 1-1 submode 1, when a maximum of four layers of data transmission is supported by the UE, the method includes, jointly encoding the RI and the W1 by employing codebook subsampling prior to configuring the CSI transmission at least for a rank indicator of two.

3. The method of claim 2, wherein precoding matrix indices of 2, 4, 6, 8, 10, 12 and 14 are used for the codebook subsampling for RI=2 when a maximum of four layers of data transmission is supported to limit the PUCCH payload size for RI feedback to 5-bits.

4. The method of claim 2, wherein precoding matrix indices of 0-7 are used for the codebook subsampling for RI=2 when a maximum of four layers of data transmission is supported to limit the PUCCH payload size for RI feedback to 5-bits.

5. The method of claim 2, wherein precoding matrix indices of 0-6 and 8-14 are used for the codebook subsampling for RI=2 when a maximum of four layers of data transmission is supported to limit the PUCCH payload size for RI feedback to 5-bits.

6. The method of claim 2, wherein precoding matrix indices of 0-13 are used for the codebook subsampling for RI=2 when a maximum of four layers of data transmission is supported to limit the PUCCH payload size for RI feedback to 5-bits.

7. The method of claim 2 when a maximum of two layers of data transmission is supported by the UE, the RI and W1 are jointly encoded, and

wherein the method comprises refraining from performing codebook sampling.

8. The method of claim 2 further comprising:

configuring a PUCCH payload to be 11-bits for the CSI feedback when the CSI feedback includes a channel-quality indicator (CQI) and a precoding matrix indicator (PMI); and

configuring a PUCCH payload to be 5-bits for the CSI feedback when the CSI feedback includes the RI.

9. The method of claim 1 wherein for PUCCH report type 2c (CQI/1st PMI/2nd PMI) in PUCCH 1-1 submode 2, the method comprises performing codebook subsampling for RI=1 or RI=2 in accordance with either table 4-1 or table 4-2:

10. The method of claim 1 wherein for PUCCH report type 1a (subband CQI/2nd PMI) in PUCCH 2-1, the method comprises performing codebook subsampling for RI=1, RI=2, RI=3 or RI=4 in accordance with one of table 5, table 6 or table 7:

11. User Equipment (UE) having processing circuitry arranged to perform codebook subsampling for enhanced 4TX codebooks when operating in a 3GPP LTE network, the processing circuitry arranged to:

configure a physical uplink control channel (PUCCH) for transmission of channel state information (CSI) feedback including a rank indicator (RI) and a precoding matrix (W1);

jointly encode a rank indicator (RI) and a precoding matrix (W1); and

perform codebook subsampling for the enhanced 4Tx codebook for at least one of;

PUCCH report type 5 (RI/1st PMI) in PUCCH 1-1 submode 1;

PUCCH report type 2c (CQI/1st PMI/2nd PMI) in PUCCH 1-1 submode 2; and

PUCCH report type 1a (subband CQI/2nd PMI) in PUCCH 2-1.

12. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors to perform operations for codebook subsampling for enhanced 4TX codebooks when operating in a 3GPP LTE network, the operations to:

configure a physical uplink control channel (PUCCH) for transmission of channel state information (CSI) feedback including a rank indicator (RI) and a precoding matrix (W1);

jointly encode a rank indicator (RI) and a precoding matrix (W1); and

perform codebook subsampling for the enhanced 4Tx codebook for at least one of;

PUCCH report type 5 (RI/1st PMI) in PUCCH 1-1 submode 1;

PUCCH report type 2c (CQI/1st PMI/2nd PMI) in PUCCH 1-1 submode 2; and

PUCCH report type 1a (subband CQI/2nd PMI) in PUCCH 2-1.