# US 10,484,065 B2 · Method and device for transmitting channel state information

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- Number: US 10,484,065 B2
- Document ID: US10484065B2
- Status: Granted
- Kind: B2
- Application number: 15/768,496
- Filed: 2016-08-29
- Published: 2018-10-18
- Granted: 2019-11-19
- Earliest claimed: 2015-10-16
- Assignees: China Academy of Telecommunications Technology
- Applicants: China Academy of Telecommunications Technology
- Inventors: Qiuping Huang; Runhua Chen; Qiubin Gao; Rakesh Tamrakar; Fangchen Cheng; Xuejuan Gao
- Web page: https://patentgrep.com/patent/US10484065B2

## CPC

- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04B 7/063: {Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection}
- H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection}
- H04B 7/066: {Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]}
- H04L 1/0026: {Transmission of channel quality indication}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The present disclosure provides in some embodiments a method and a device for transmitting CSI. The method for transmitting the CSI includes steps of: determining, by a UE, a first number of bits used for a joint encoding operation on a BI and a RI, the BI being configured to indicate an index of a resource for transmitting a reference signal corresponding to the RI measured by the UE, an identical first number of bits being used for the joint encoding operation on RI(s) and the BI corresponding to all resources for transmitting the reference signal; and performing, by the UE, the joint encoding operation on the RI and the BI in accordance with the first number of bits to acquire encoding information, and transmitting the encoding information.

## Claims

### Claim 1

A method for transmitting Channel State Information (CSI), comprising steps of:
determining, by a User Equipment (UE), a first number of bits used for a joint encoding operation on a Beam Indicator (BI) and a Rank Indicator (RI), the BI being configured to indicate an index of a resource for transmitting a reference signal corresponding to the RI measured by the UE, an identical first number of bits being used for the joint encoding operation on RI(s) and the BI corresponding to all resources for transmitting the reference signal; and
performing, by the UE, the joint encoding operation on the measured RI and the BI in accordance with the first number of bits to acquire encoding information, and transmitting the encoding information,
wherein the step of determining, by the UE, the first number of bits used for the joint encoding operation on the BI and the RI comprises:
determining, by the UE, numbers of bits for the RIs corresponding to all resources for transmitting the reference signal, determining, by the UE, a second number of bits for encoding the RI in accordance with a maximum value of the numbers of bits for the RIs corresponding to all resources for transmitting the reference signal, and determining, by the UE, the first number of bits in accordance with the second number of bits and a number of bits corresponding to the BI; or
determining, by the UE, a total number of possible values of the RIs corresponding to all resources for transmitting the reference signal, and determining, by the UE, the first number of bits in accordance with the total number of the possible values of the RIs corresponding to all resources for transmitting the reference signal.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the step of determining, by the UE, the number of bits for the RIs corresponding to all resources for transmitting the reference signal comprises:
determining, by the UE, a number of bits for the RI corresponding to each resource for transmitting the reference signal in accordance with a number of antenna ports corresponding to each resource for transmitting the reference signal; or
determining, by the UE, a number of bits for the RI corresponding to each resource for transmitting the reference signal in accordance with a minimum value of the number of antenna ports corresponding to each resource for transmitting the reference signal and a maximum number of layers that is supported by the UE.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising:
in the case that the UE determines that the number of bits for the measured RI corresponding to the resource for transmitting the reference signal is smaller than the second number of bits, performing, by the UE, a bit padding operation on the RI corresponding to the resource for transmitting the reference signal in accordance with a predetermined bit padding rule; and
the step of performing, by the UE, the joint encoding operation on the measured RI and the BI in accordance with the first number of bits comprises performing, by the UE, the joint encoding operation on the RI acquired after the bit padding operation and the BI in accordance with the first number of bits.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the step of determining, by the UE, the total number of the possible values of the RIs corresponding to all resources for transmitting the reference signal comprises:
determining, by the UE, a total number of the antenna ports corresponding to all resources for transmitting the reference signal as the total number of the possible values of the RIs corresponding to all resources for transmitting the reference signal; or
determining, by the UE, a minimum value of a number of the antenna ports corresponding to each resource for transmitting the reference signal and the maximum number of layers that is supported by the UE, and determining a sum of the minimum values as the total number of the possible values of the RIs corresponding to all resources for transmitting the reference signal.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the first number of bits is determined by the UE using the following equation:
A=┌ log2(Σ1≤k≤KNk)┐, or
A=┌ log2(Σ1≤k≤K min{L,Nk})┐,
where A represents the first number of bits, Nk represents the number of antenna ports corresponding to a kth resource for transmitting the reference signal, K represents a number of resources for transmitting the reference signal, L represents the maximum layers that is supported by the UE, and ┌ ┐ represents a rounding-up operation.

### Claim 6

A method for receiving Channel State Information (CSI), comprising steps of:
determining, by a base station, a first number of bits used for a joint encoding operation on a Beam Indicator (BI) and a Rank Indicator (RI), the BI being configured to indicate an index of a resource for transmitting a reference signal corresponding to the RI measured by a User Equipment (UE), an identical first number of bits being used for the joint encoding operation on RI(s) and the BI corresponding to all resources for transmitting the reference signal; and
performing, by the base station, a joint decoding operation on encoding information from the UE in accordance with the first number of bits, to acquire the RI corresponding to the resource for transmitting the reference signal measured by the UE,
wherein the step of determining, by the base station, the first number of bits used for the joint encoding operation on the BI and the RI comprises:
determining, by the base station, numbers of bits for the RIs corresponding to all resources for transmitting the reference signal, determining, by the base station, a second number of bits for encoding the RI in accordance with a maximum value of the numbers of bits for the RIs corresponding to all resources for transmitting the reference signal, and determining, by the base station, the first number of bits in accordance with the second number of bits and a number of bits corresponding to the BI; or
determining, by the base station, a total number of possible values of the RIs corresponding to all resources for transmitting the reference signal, and determining, by the base station, the first number of bits in accordance with the total number of the possible values of the RIs corresponding to all resources for transmitting the reference signal.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the step of determining, by the base station, the numbers of bits for the RIs corresponding to all resources for transmitting the reference signal comprises:
determining, by the base station, a number of bits for the RI corresponding to each resource for transmitting the reference signal in accordance with a number of antenna ports corresponding to each resource for transmitting the reference signal; or
determining, by the base station, a number of bits for the RI corresponding to each resource for transmitting the reference signal in accordance with a minimum value of the number of antenna ports corresponding to each resource for transmitting the reference signal and a maximum number of layers that is supported by the UE.

### Claim 8 (depends on 6)

The method according to claim 6, wherein the step of performing, by the base station, the joint decoding operation on the encoding information from the UE in accordance with the first number of bits to acquire the RI corresponding to the resource for transmitting the reference signal comprises:
performing, by the base station, the joint decoding operation on the encoding information from the UE in accordance with the first number of bits, to acquire the BI and the RI;
determining, by the base station, that the number of bits for the RI corresponding to the resource for transmitting the reference signal measured by the UE is smaller than the second number of bits, in accordance with the BI; and
acquiring, by the base station, the RI corresponding to the resource for transmitting the reference signal measured by the UE in accordance with the RI and a predetermined bit padding rule.

### Claim 9 (depends on 6)

The method according to claim 6, wherein the step of determining, by the base station, the total number of the possible values of the RIs corresponding to all resources for transmitting the reference signal comprises:
determining, by the base station, a total number of the antenna ports corresponding to all resources for transmitting the reference signal as the total number of the possible values of the RIs corresponding to all resources for transmitting the reference signal; or
determining, by the base station, a minimum value of a number of the antenna ports corresponding to each resource for transmitting the reference signal and the maximum number of layers that is supported by the UE, and determining a sum of the minimum values as the total number of the possible values of the RIs corresponding to all resources for transmitting the reference signal.

### Claim 10 (depends on 9)

The method according to claim 9, wherein the first number of bits is determined by the base station using the following equation:
A=┌ log2(Σ1≤k≤KNk)┐, or
A=┌ log2(Σ1≤k≤K min{L,Nk})┐,
where A represents the first number of bits, Nk represents the number of antenna ports corresponding to a kth resource for transmitting the reference signal, K represents a number of resources for transmitting the reference signal, L represents the maximum layers that is supported by the UE, and ┌ ┐ represents a rounding-up operation.

### Claim 11

A User Equipment (UE), comprising:
a processor; and
a memory connected to the processor via a bus interface and configured to store therein programs and data for the operation of the processor, wherein
the processor is configured to call and execute the programs and data stored in the memory to:
determine a first number of bits used for a joint encoding operation on a Beam Indicator (BI) and a Rank Indicator (RI), the BI being configured to indicate an index of a resource for transmitting a reference signal corresponding to the RI measured by the UE, an identical first number of bits being used for the joint encoding operation on RI(s) and the BI corresponding to all resources for transmitting the reference signal; and
perform the joint encoding operation on the RI and the BI in accordance with the first number of bits to acquire encoding information, and transmit the encoding information,
wherein the processor is further configured to:
determine numbers of bits for the RIs corresponding to all resources for transmitting the reference signal, determine a second number of bits for encoding the RI in accordance with a maximum value of the numbers of bits for the RIs corresponding to all resources for transmitting the reference signal, and determine the first number of bits in accordance with the second number of bits and a number of bits corresponding to the BI; or
determine a total number of possible values of the RIs corresponding to all resources for transmitting the reference signal, and determine the first number of bits in accordance with the total number of the possible values of the RIs corresponding to all resources for transmitting the reference signal.

### Claim 12 (depends on 11)

The UE according to claim 11, wherein the processor is further configured to:
determine a number of bits for the RI corresponding to each resource for transmitting the reference signal in accordance with a number of antenna ports corresponding to each resource for transmitting the reference signal; or
determine a number of bits for the RI corresponding to each resource for transmitting the reference signal in accordance with a minimum value of the number of antenna ports corresponding to each resource for transmitting the reference signal and a maximum number of layers that is supported by the UE.

### Claim 13 (depends on 11)

The UE according to claim 11, wherein the processor is further configured to:
in the case that the UE determines that the number of bits for the measured RI corresponding to the resource for transmitting the reference signal is smaller than the second number of bits, perform a bit padding operation on the RI corresponding to the resource for transmitting the reference signal in accordance with a predetermined bit padding rule; and
perform the joint encoding operation on the RI acquired after the bit padding operation and the BI in accordance with the first number of bits.

### Claim 14 (depends on 11)

The UE according to claim 11, wherein the processor is further configured to:
determine a total number of the antenna ports corresponding to all resources for transmitting the reference signal as the total number of the possible values of the RIs corresponding to all resources for transmitting the reference signal; or
determine a minimum value of a number of the antenna ports corresponding to each resource for transmitting the reference signal and the maximum number of layers that is supported by the UE, and determine a sum of the minimum values as the total number of the possible values of the RIs corresponding to all resources for transmitting the reference signal.

### Claim 15 (depends on 14)

The UE according to claim 14, wherein the first number of bits is determined by the UE using the following equation:
A=┌ log2(Σ1≤k≤KNk)┐, or
A=┌ log2(Σ1≤k≤K min{L,Nk})┐,
where A represents the first number of bits, Nk represents the number of antenna ports corresponding to a kth resource for transmitting the reference signal, K represents a number of resources for transmitting the reference signal, L represents the maximum layers that is supported by the UE, and ┌ ┐ represents a rounding-up operation.

### Claim 16

A network side device, comprising:
a processor; and
a memory connected to the processor via a bus interface and configured to store therein programs and data for the operation of the processor, wherein
the processor is configured to call and execute the programs and data stored in the memory to:
determine a first number of bits used for a joint encoding operation on a Beam Indicator (BI) and a Rank Indicator (RI), the BI being configured to indicate an index of a resource for transmitting a reference signal corresponding to the RI measured by a User Equipment (UE), an identical first number of bits being used for the joint encoding operation on RI(s) and the BI corresponding to all resources for transmitting the reference signal; and
perform a joint decoding operation on encoding information from the UE in accordance with the first number of bits, to acquire the RI corresponding to the resource for transmitting the reference signal measured by the UE,
wherein the processor is further configured to:
determine numbers of bits for the RIs corresponding to all resources for transmitting the reference signal, determine a second number of bits for encoding the RI in accordance with a maximum value of the numbers of bits for the RIs corresponding to all resources for transmitting the reference signal, and determine the first number of bits in accordance with the second number of bits and a number of bits corresponding to the BI; or
determine a total number of possible values of the RIs corresponding to all resources for transmitting the reference signal, and determine the first number of bits in accordance with the total number of the possible values of the RIs corresponding to all resources for transmitting the reference signal.

### Claim 17 (depends on 16)

The network side device according to claim 16, wherein the processor is further configured to:
determine a number of bits for the RI corresponding to each resource for transmitting the reference signal in accordance with a number of antenna ports corresponding to each resource for transmitting the reference signal; or
determine a number of bits for the RI corresponding to each resource for transmitting the reference signal in accordance with a minimum value of the number of antenna ports corresponding to each resource for transmitting the reference signal and a maximum number of layers that is supported by the UE.

### Claim 18 (depends on 16)

The network side device according to claim 16, wherein the processor is further configured to:
perform the joint decoding operation on the encoding information from the UE in accordance with the first number of bits, to acquire the BI and the RI;
determine that the number of bits for the RI corresponding to the resource for transmitting the reference signal measured by the UE is smaller than the second number of bits, in accordance with the BI; and
acquire the RI corresponding to the resource for transmitting the reference signal measured by the UE in accordance with the RI and a predetermined bit padding rule.

### Claim 19 (depends on 16)

The network side device according to claim 16, wherein the processor is further configured to:
determine a total number of the antenna ports corresponding to all resources for transmitting the reference signal as the total number of the possible values of the Ms corresponding to all resources for transmitting the reference signal; or
determine a minimum value of a number of the antenna ports corresponding to each resource for transmitting the reference signal and the maximum number of layers that is supported by the UE, and determine a sum of the minimum values as the total number of the possible values of the RIs corresponding to all resources for transmitting the reference signal.

### Claim 20 (depends on 19)

The network side device according to claim 19, wherein the first number of bits is determined by the base station using the following equation:
A=┌ log2(Σ1≤k≤KNk)┐, or
A=┌ log2(Σ1≤k≤K min{L,Nk})┐,
where A represents the first number of bits, Nk represents the number of antenna ports corresponding to a kth resource for transmitting the reference signal, K represents a number of resources for transmitting the reference signal, L represents the maximum layers that is supported by the UE, and ┌ ┐ represents a rounding-up operation.