UCI resource determination for CSI reporting

• US 10,601,563 B2
• Filed: 09/27/2018
• Issued: 03/24/2020
• Est. Priority Date: 01/09/2017
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Yang, Weidong, Tsai, Lung-Sheng
• Primary Examiner(s): Chery, Dady
• Application Number:
  US16/143,837
• Publication Number:
  US 20190028256A1
• Time in Patent Office: 544 Days
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA

Abstract

A method of wireless communication of a UE is provided. The UE determines a reference size of a payload available in a physical uplink channel for carrying R channel state information (CSI) reports, R being an integer greater than 0, each of the R CSI reports including a first part containing CSI of a wideband and a second part containing CSI of one or more subbands of the wideband. The UE carries all first parts of the R CSI reports in the payload. The UE further carries second parts of (M−1) CSI reports of the R CSI reports in the payload. The UE carries a portion of a second part of an M^th CSI report of the R CSI reports in the payload.

Claims

1. A method of wireless communication of a user equipment (UE), comprising:

determining, at the UE, a reference size of a payload available in a physical uplink channel between the UE and a base station for carrying R channel state information (CSI) reports, R being an integer greater than 0, each of the R CSI reports including a first part containing CSI of a wideband and a second part containing CSI of one or more subbands of the wideband;

determining, at the UE, all first parts of the R CSI reports;

determining, at the UE, second parts of (M−

1) CSI reports of the R CSI reports, M being a maximum integer that allows the reference size to be greater than or equal to a first total size of (a) all first parts of the R CSI reports and (b) second parts of a selection of (M−

1) CSI reports of the R CSI reports;

determining, at the UE, a portion of a second part of an M^th CSI report of the R CSI reports, the M^th CSI report being not in the (M−

1) CSI reports, such that the reference size is greater than or equal to a second total size of (a) all the first parts of the R CSI reports, (b) the second parts of the (M−

1) CSI reports, and (c) the portion of the second part of the M^th CSI report;

generating, at the UE, signals that represent all the first parts of the R CSI reports, the second parts of (M−

1) CSI reports, and the portion of a second part of an M^th CSI report; and

transmitting, at the UE, the signals in the payload of the physical uplink channel to the base station.

2. The method of claim 1, wherein the portion of the second part of the M^th CSI contains CSI of J subbands of N_M subbands, N_M being an integer greater than 0, J being an integer smaller than or equal to N_M.

3. The method of claim 2, wherein the J subbands are even numbered subbands of the N_M subbands in a first order.

4. The method of claim 2, wherein the J subbands are odd numbered subbands of the N_M subbands in a first order.

5. The method of claim 2, further comprising:

determining a difference between the reference size and the first total size; and

determining that the CSI of the J subbands are to be included in the payload based on the difference and a third total size of the CSI of the J subbands, wherein J is a maximum integer that allows the third size to be no greater than the difference; and

selecting the J subbands from the N_M subbands based on a first predetermined rule.

6. The method of claim 5, wherein the selecting the J subbands includes:

determining a number D;

distributing the N_M subbands into D groups, each group including J or less subbands; and

selecting a first group of the D groups, the first group including the J subbands.

7. The method of claim 6, wherein the number D is the smallest integer greater than or equal to (N_M/J).

8. The method of claim 6, further comprising:

receiving an indication indicating the number D, wherein the number D is determined based on the indication.

9. The method of claim 6, wherein the distributing the N_M subbands into D groups includes sequentially allocating each of the N_M subbands into a respective one of the D groups in turn in a first order.

10. The method of claim 6, wherein D is determined to be 2, wherein one group of the D groups includes even numbered subbands of the N_M subbands and the other group of the D groups includes odd numbered subbands of the N_M subbands.

11. The method of claim 5, wherein the selecting the J subbands includes:

determining a number D that is the smallest integer greater than or equal to (Nm/J);

generating a matrix having D columns and J rows;

placing the N_M subbands into the matrix sequentially in a row by row order; and

reading the J subbands from the matrix sequentially in a column by column order.

12. An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:

a memory; and

at least one processor coupled to the memory and configured to;

determine, at the UE, a reference size of a payload available in a physical uplink channel between the UE and a base station for carrying R channel state information (CSI) reports, R being an integer greater than 0, each of the R CSI reports including a first part containing CSI of a wideband and a second part containing CSI of one or more subbands of the wideband;

determining, at the UE, all first parts of the R CSI reports;

determining, at the UE, second parts of (M−

1) CSI reports of the R CSI reports, M being a maximum integer that allows the reference size to be greater than or equal to a first total size of (a) all first parts of the R CSI reports and (b) second parts of a selection of (M−

1) CSI reports of the R CSI reports;

determining, at the UE, a portion of a second part of an M^th CSI report of the R CSI reports in the payload, the M^th CSI report being not in the (M−

1) CSI reports, such that the reference size is greater than or equal to a second total size of (a) all the first parts of the R CSI reports, (b) the second parts of the (M−

1) CSI reports, and (c) the portion of the second part of the M^th CSI report;

generate, at the UE, signals representing all the first parts of the R CSI reports, the second parts of (M−

1) CSI reports, and the portion of a second part of an M^th CSI report; and

transmit, at the UE, the signals in the payload of the physical uplink channel.

13. The apparatus of claim 12, wherein the portion of the second part of the M^th CSI contains CSI of J subbands of N_M subbands, N_M being an integer greater than 0, J being an integer smaller than or equal to N_M.

14. The apparatus of claim 13, wherein the at least one processor is further configured to:

determine a difference between the reference size and the first total size; and

determine that the CSI of the J subbands are to be included in the payload based on the difference and a third total size of the CSI of the J subbands, wherein J is a maximum integer that allows the third size to be no greater than the difference; and

select the J subbands from the NM subbands based on a first predetermined rule.

15. The apparatus of claim 14, wherein to select the J subbands, the at least one processor is further configured to:

determine a number D;

distribute the N_M subbands into D groups, each group including J or less subbands; and

select a first group of the D groups, the first group including the J subbands.

16. The apparatus of claim 15, wherein the number D is the smallest integer greater than or equal to (N_M/J).

17. The apparatus of claim 15, wherein the at least one processor is further configured to:

receive an indication indicating the number D, wherein the number D is determined based on the indication.

18. The apparatus of claim 15, wherein to distribute the N_M subbands into D groups, the at least one processor is further configured to sequentially allocate each of the N_M subbands into a respective one of the D groups in turn in a first order.

19. The apparatus of claim 14, wherein to select the J subbands, the at least one processor is further configured to:

determine a number D that is the smallest integer greater than or equal to (Nm/J);

generate a matrix having D columns and J rows;

place the N_M subbands into the matrix sequentially in a row by row order; and

read the J subbands from the matrix sequentially in a column by column order.

20. A non-transitory computer-readable medium storing computer executable code for wireless communication of wireless equipment, comprising code to:

determine, at the UE, a reference size of a payload available in a physical uplink channel between the UE and a base station for carrying R channel state information (CSI) reports, R being an integer greater than 0, each of the R CSI reports including a first part containing CSI of a wideband and a second part containing CSI of one or more subbands of the wideband;

determining, at the UE, all first parts of the R CSI reports;

determining, at the UE, second parts of (M−

1) CSI reports of the R CSI reports in the payload, M being a maximum integer that allows the reference size to be greater than or equal to a first total size of (a) all first parts of the R CSI reports and (b) second parts of a selection of (M−

1) CSI reports of the R CSI reports;

determining, at the UE, a portion of a second part of an M^th CSI report of the R CSI reports, the M^th CSI report being not in the (M−

1) CSI reports, such that the reference size is greater than or equal to a second total size of (a) all the first parts of the R CSI reports, (b) the second parts of the (M−

1) CSI reports, and (c) the portion of the second part of the M^th CSI report; and

generate, at the UE, signals representing all the first parts of the R CSI reports, the second parts of (M−

1) CSI reports, and the portion of a second part of an M^th CSI report; and

transmit, at the UE, the signals in the payload of the physical uplink channel.