# US 2018/0323924 A1 · Method of transmitting transmission channel state information, and device, base station and terminal utilizing same

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- Number: US 2018/0323924 A1
- Document ID: US20180323924A1
- Status: Published application
- Kind: A1
- Application number: 15/772,885
- Filed: 2016-09-02
- Published: 2018-11-08
- Earliest claimed: 2015-11-04
- Assignees: China Mobile Communications Group Co., Ltd.
- Applicants: China Mobile Communications Group Co., Ltd.
- Inventors: Jing Jin; Hui Tong; Dan Wu; Fei Wang; Qixing Wang
- Web page: https://patentgrep.com/patent/US20180323924A1

## CPC

- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04B 7/0469: {taking special antenna structures, e.g. cross polarized antennas into account}
- H04B 7/10: Polarisation diversity; Directional diversity
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/04: the signals being represented by different amplitudes or polarities, e.g. quadriplex
- H04L 5/0082: {at predetermined intervals}
- H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

The disclosure provides a method of transmitting transmission channel state information, and device, base station and terminal utilizing the same. The method comprises: transmitting, by 16 channel state information reference signal (CSI-RS) ports, CSI-RSs, wherein the CSI-RSs are mapped to a resource element (RE) set in CSI-RS pilot patterns, the RE set comprises REs mapping to 2 sets of 8 CSI-RS ports, a first set of CSI-RS port serial numbers and a second set of the CSI-RS port serial numbers in the 16 CSI-RS ports are mapped to REs mapping to a first set of the 8 CSI-RS ports in the 2 sets of the 8 CSI-RS ports, and a third set of CSI-RS port serial numbers and a fourth set of the CSI-RS port serial numbers in the 16 CSI-RS ports are mapped to REs mapping to a second set of the 8 CSI-RS ports in the 2 sets of the 8 CSI-RS ports; and measuring, by a receiving end, according to the CSI-RSs, channel state information. The embodiments of the disclosure can reduce repeated CSI-RS overheads, while increasing accuracy of a CSI measurement comparing to a conventional terminal, enhancing performance of a base station.

## Claims

### Claim 1

A Channel State Information-Reference Signal (CSI-RS) sending method, applied to a base station, the method comprising:
sending CSI-RSs through 16 CSI-RS ports, herein the CSI-RSs are mapped to a Resource Element (RE) set in a CSI-RS pilot pattern, the RE set comprising REs to which CSI-RSs of 2 groups of 8 ports are mapped, a first group of CSI-RS port serial numbers and second group of CSI-RS port serial numbers for the 16 CSI-RS ports are mapped to REs to which CSI-RSs of the first group of 8 ports among the CSI-RSs of the two groups of 8 ports are mapped, and a third group of CSI-RS port serial numbers and fourth group of CSI-RS port serial numbers for the 16 CSI-RS ports are mapped to REs to which CSI-RSs of the second group of 8 ports among the CSI-RSs of the two groups of 8 ports are mapped,
herein each of the first group of CSI-RS port serial numbers, the second group of CSI-RS port serial numbers, the third group of CSI-RS port serial numbers and the fourth group of CSI-RS port serial numbers comprises 4 continuous CSI-RS port serial numbers, the first group of CSI-RS port serial numbers and the second group of CSI-RS port serial numbers are spaced by the third group of CSI-RS port serial numbers, and the third group of CSI-RS port serial numbers and the fourth group of CSI-RS port serial numbers are spaced by the second group of CSI-RS port serial numbers; and
receiving Channel State Information (CSI) measured by User Equipment (UE) on the basis of the CSI-RSs.

### Claim 2 (depends on 1)

The method according to claim 1, wherein serial numbers of the 16 CSI-RS ports are sequentially 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 and 30.

### Claim 3 (depends on 1)

The method according to claim 1, wherein two continuous CSI-RS port serial numbers among the first group of CSI-RS port serial numbers are mapped to two REs located on a first subcarrier, and the other two continuous CSI-RS port serial numbers among the first group of CSI-RS port serial numbers are mapped to two REs located on a second subcarrier, wherein the first subcarrier and the second subcarrier are spaced by 5 subcarriers, and are two subcarriers among 4 subcarriers where the mapped REs for the CSI-RSs of the first group of 8 ports are located.

### Claim 4 (depends on 3)

The method according to claim 3, wherein two continuous CSI-RS port serial numbers among the second group of CSI-RS port serial numbers are mapped to two REs located on a third subcarrier, and the other two continuous CSI-RS port serial numbers among the second group of CSI-RS port serial numbers are mapped to two REs located on a fourth subcarrier, wherein the third subcarrier and the fourth subcarrier are spaced by 5 subcarriers, and are the other two subcarriers among the 4 subcarriers where the mapped REs for the CSI-RSs of the first group of 8 ports are located.

### Claim 5 (depends on 1)

The method according to claim 1, wherein two continuous CSI-RS port serial numbers among the third group of CSI-RS port serial numbers are mapped to two REs located on a fifth subcarrier, and the other two continuous CSI-RS port serial numbers among the third group of CSI-RS port serial numbers are mapped to two REs located on a sixth subcarrier, wherein the fifth subcarrier and the sixth subcarrier are spaced by 5 subcarriers, and are two subcarriers among 4 subcarriers where the mapped REs for the CSI-RSs of the second group of 8 ports are located.

### Claim 6 (depends on 5)

The method according to claim 5, wherein two continuous CSI-RS port serial numbers among the fourth group of CSI-RS port serial numbers are mapped to two REs located on a seventh subcarrier, and the other two continuous CSI-RS port serial numbers among the fourth group of CSI-RS port serial numbers are mapped to two REs located on an eighth subcarrier, wherein the seventh subcarrier and the eighth subcarrier are spaced by 5 subcarriers, and are the other two subcarriers among the 4 subcarriers where the mapped REs for the CSI-RSs of the second group of 8 ports are located.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the first group of CSI-RS port serial numbers and the third group of CSI-RS port serial numbers form 8 continuous CSI-RS port serial numbers corresponding to 8 antennae or 8 radio frequency channels in a first polarization direction; and the second group of CSI-RS port serial numbers and the fourth group of CSI-RS port serial numbers form 8 continuous CSI-RS port serial numbers corresponding to 8 antennae or 8 radio frequency channels in a second polarization direction.

### Claim 8 (depends on 7)

The method according to claim 7, wherein 4 antennae or 4 radio frequency channels which correspond to the first group of CSI-RS port serial numbers and of which a polarization direction is the first polarization direction and 4 antennae or 4 radio frequency channels which correspond to the second group of CSI-RS port serial numbers and of which a polarization direction is the second polarization direction are at a first perpendicular location, and 4 antennae or 4 radio frequency channels which correspond to the third group of CSI-RS port serial numbers and of which a polarization direction is the first polarization direction and 4 antennae or 4 radio frequency channels which correspond to the fourth group of CSI-RS port serial numbers and of which a polarization direction is the second polarization direction are at a second perpendicular location.

### Claim 9

A Channel State Information-Reference Signal (CSI-RS) sending device, applied to a base station, wherein the device comprises:
a processor; and
a memory for storing instructions executable by the processor,
wherein the processor is arranged to:
send CSI-RSs through 16 CSI-RS ports, wherein the CSI-RSs are mapped to a Resource Element (RE) set in a CSI-RS pilot pattern, the RE set comprises REs to which CSI-RSs of 2 groups of 8 ports are mapped, a first group of CSI-RS port serial numbers and second group of CSI-RS port serial numbers for the 16 CSI-RS ports are mapped to REs to which CSI-RSs of the first group of 8 ports among the CSI-RSs of the two groups of 8 ports are mapped, and a third group of CSI-RS port serial numbers and fourth group of CSI-RS port serial numbers for the 16 CSI-RS ports are mapped to REs to which CSI-RSs of the second group of 8 ports among the CSI-RSs of the two groups of 8 ports are mapped,
wherein each of the first group of CSI-RS port serial numbers, the second group of CSI-RS port serial numbers, the third group of CSI-RS port serial numbers and the fourth group of CSI-RS port serial numbers comprises 4 continuous CSI-RS port serial numbers, the first group of CSI-RS port serial numbers and the second group of CSI-RS port serial numbers are spaced by the third group of CSI-RS port serial numbers, and the third group of CSI-RS port serial numbers and the fourth group of CSI-RS port serial numbers are spaced by the second group of CSI-RS port serial numbers; and
receive Channel State Information (CSI) measured by User Equipment (UE) on the basis of the CSI-RS.

### Claim 10 (depends on 9)

The device according to claim 9, wherein the serial numbers of the 16 CSI-RS ports are sequentially 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 and 30.

### Claim 11 (depends on 9)

The device according to claim 9, wherein two continuous CSI-RS port serial numbers among the first group of CSI-RS port serial numbers are mapped to two REs located on a first subcarrier, and the other two continuous CSI-RS port serial numbers among the first group of CSI-RS port serial numbers are mapped to two REs located on a second subcarrier, wherein the first subcarrier and the second subcarrier are spaced by 5 subcarriers, and are two subcarriers among 4 subcarriers where the mapped REs for the CSI-RSs of the first group of 8 ports are located.

### Claim 12 (depends on 11)

The device according to claim 11, wherein two continuous CSI-RS port serial numbers among the second group of CSI-RS port serial numbers are mapped to two REs located on a third subcarrier, and the other two continuous CSI-RS port serial numbers among the second group of CSI-RS port serial numbers are mapped to two REs located on a fourth subcarrier, wherein the third subcarrier and the fourth subcarrier are spaced by 5 subcarriers, and are the other two subcarriers among the 4 subcarriers where the mapped REs for the CSI-RSs of the first group of 8 ports are located.

### Claim 13 (depends on 9)

The device according to claim 9, wherein two continuous CSI-RS port serial numbers among the third group of CSI-RS port serial numbers are mapped to two REs located on a fifth subcarrier, and the other two continuous CSI-RS port serial numbers among the third group of CSI-RS port serial numbers are mapped to two REs located on a sixth subcarrier, wherein the fifth subcarrier and the sixth subcarrier are spaced by 5 subcarriers, and are two subcarriers among 4 subcarriers where the mapped REs for the CSI-RSs of the second group of 8 ports are located.

### Claim 14 (depends on 13)

The device according to claim 13, wherein two continuous CSI-RS port serial numbers among the fourth group of CSI-RS port serial numbers are mapped to two REs located on a seventh subcarrier, and the other two continuous CSI-RS port serial numbers among the fourth group of CSI-RS port serial numbers are mapped to two REs located on an eighth subcarrier, wherein the seventh subcarrier and the eighth subcarrier are spaced by 5 subcarriers, and are the other two subcarriers among the 4 subcarriers where the mapped REs for the CSI-RSs of the second group of 8 ports are located.

### Claim 15 (depends on 9)

The device according to claim 9, wherein the first group of CSI-RS port serial numbers and the third group of CSI-RS port serial numbers form 8 continuous CSI-RS port serial numbers corresponding to 8 antennae or 8 radio frequency channels in a first polarization direction; and the second group of CSI-RS port serial numbers and the fourth group of CSI-RS port serial numbers form 8 continuous CSI-RS port serial numbers corresponding to 8 antennae or 8 radio frequency channels in a second polarization direction.

### Claim 16 (depends on 15)

The device according to claim 15, wherein 4 antennae or 4 radio frequency channels which correspond to the first group of CSI-RS port serial numbers and of which a polarization direction is the first polarization direction and 4 antennae or 4 radio frequency channels which correspond to the second group of CSI-RS port serial numbers and of which a polarization direction is the second polarization direction are at a first perpendicular location, and 4 antennae or 4 radio frequency channels which correspond to the third group of CSI-RS port serial numbers and of which a polarization direction is the first polarization direction and 4 antennae or 4 radio frequency channels which correspond to the fourth group of CSI-RS port serial numbers and of which a polarization direction is the second polarization direction are at a second perpendicular location.

### Claim 17

(canceled)

### Claim 18

A Channel State Information-Reference Signal (CSI-RS) sending method, applied to User Equipment (UE), the method comprising:
receiving CSI-RSs sent by a base station according to CSI-RS pattern information;
measuring Channel State Information (CSI) on the basis of the received CSI-RSs; and
sending the measured CSI to the base station.

### Claim at position 19

19-20. (canceled)