US-12627343-B2 - Operation method of user equipment for beamforming in wireless communication system and user equipment therefor

Abstract

Provided are an operation method of a user equipment and a user equipment for the operation method. The operation method includes obtaining channel estimation information comprising beam direction information of a base station. The operation method includes performing channel estimation for beamforming based on the channel estimation information. The operation method includes forming a beam based on the channel estimation. The beam direction information of the base station is generated using a geographic coordinate system.

Inventors

• Youngseok JUNG
• JooHan KIM
• Suhwang JEONG
• Jaehoon Jung

Assignees

• SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date

20260512

Application Date

20241021

Priority Date

20240102

Claims (20)

1. 1 . An operation method of a user equipment comprising a plurality of element antennas, the operation method comprising: obtaining channel estimation information comprising beam direction information of a base station; performing channel estimation for beamforming based on the channel estimation information; and forming a beam based on the channel estimation, wherein the beam direction information of the base station is generated using a geographic coordinate system.
2. 2 . The operation method of claim 1 , wherein the performing of the channel estimation comprises: estimating a plurality of transmission/reception angles of two element antennas among the plurality of element antennas, based on the channel estimation information; and estimating a phase difference between the two element antennas based on the plurality of transmission/reception angles, wherein the plurality of transmission/reception angles of the two element antennas are the same.
3. 3 . The operation method of claim 1 , wherein the performing of the channel estimation comprises: estimating a plurality of transmission/reception angles of two element antennas among the plurality of element antennas and a communication distance, based on the channel estimation information; and estimating a phase difference between the two element antennas based on the plurality of transmission/reception angles, wherein the plurality of transmission/reception angles of the two element antennas are different, and wherein the communication distance is a distance between the base station and the user equipment.
4. 4 . The operation method of claim 3 , wherein the channel estimation information further comprises location information of the base station and location information of the user equipment, and the communication distance is estimated based on the location information of the base station and the location information of the user equipment.
5. 5 . The operation method of claim 3 , wherein the channel estimation information further comprises timing information corresponding to twice the communication distance, and the communication distance is estimated based on the timing information.
6. 6 . The operation method of claim 5 , wherein the timing information is obtained based on oversampling.
7. 7 . The operation method of claim 1 , wherein the beam direction information of the base station comprises at least one of i) an elevation angle with reference to a surface of earth, or ii) an azimuth angle.
8. 8 . The operation method of claim 1 , wherein the beam direction information of the base station is matched to a synchronization signal block (SSB) index or a precoding matrix indicator (PMI).
9. 9 . The operation method of claim 8 , wherein the beam direction information of the base station is matched to one or more bits among all bits of the SSB index or one or more bits among all bits of the PMI.
10. 10 . The operation method of claim 1 , wherein the channel estimation information is comprised in: a master information block (MIB), a system information block (SIB), a radio resource control (RRC) signal, a medium access control control element (MAC CE), or downlink control information (DCI).
11. 11 . The operation method of claim 1 , wherein the performing of the channel estimation comprises performing the channel estimation based on: a compressive sensing technique, exhaustive search, or machine learning.
12. 12 . An operation method of a user equipment in a wireless communication system, the operation method comprising: selecting a best synchronization signal block (SSB) from among a plurality of SSBs received from a base station; obtaining beam direction information matched to the best SSB; obtaining three-dimensional orientation information of the user equipment; calculating a transmission/reception angle of the user equipment, based on the beam direction information and on the three-dimensional orientation information of the user equipment; and forming a beam based on the transmission/reception angle of the user equipment.
13. 13 . The operation method of claim 12 , wherein the beam direction information is generated using a geographic coordinate system.
14. 14 . The operation method of claim 12 , wherein the selecting of the best SSB comprises selecting the best SSB based on: a received signal strength indicator (RSSI), reference signal received power (RSRP), or a reference signal-to-noise ratio.
15. 15 . The operation method of claim 12 , wherein the obtaining of the beam direction information comprises obtaining the beam direction information matched to one or more bits among all bits of the best SSB.
16. 16 . The operation method of claim 12 , further comprising: obtaining location information of the base station; and estimating a communication distance between the base station and the user equipment, based on the location information of the base station and location information of the user equipment, wherein the forming of the beam comprises forming the beam based on a transmission/reception angle of the user equipment and the communication distance.
17. 17 . A user equipment for wireless communication, the user equipment comprising: a plurality of element antennas; and a communication processor configured to perform channel estimation for beamforming based on channel estimation information and form a beam based on the channel estimation, wherein the channel estimation information comprises beam direction information of a base station, and wherein the beam direction information is generated using a geographic coordinate system.
18. 18 . The user equipment of claim 17 , further comprising a memory configured to receive and store location information of the base station, wherein the channel estimation information further comprises the location information of the base station and location information of the user equipment.
19. 19 . The user equipment of claim 18 , wherein the memory is configured to receive and store location information of a neighboring base station, and the communication processor is further configured to, when performing hand-over, perform the channel estimation based on the location information of the neighboring base station.
20. 20 . The user equipment of claim 19 , wherein the location information of the neighboring base station comprises: location information generated using the geographic coordinate system, or relative location information with respect to the location information of the base station.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2024-0000491, filed on Jan. 2, 2024, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety. BACKGROUND Recently, 5G (or New Radio (NR)) communication systems aim at providing ultrahigh-speed data services at several gigabits per second (Gbps) by using, as a new radio access technology, Ultra-Wideband having a bandwidth of 100 MHz or more as compared with existing Long-Term Evolution (LTE) and LTE-Advanced (LTE-A). However, because it is difficult to secure frequencies in an ultrawide band of 100 MHz or more in a frequency band of hundreds of MHz or several GHz, which is used in LTE and LTE-A, methods of transmitting signals by using a wide frequency band in a frequency band of 6 GHz or more are considered for 5G communication systems. Specifically, in 5G communication systems, transmission rates may be increased by using a millimeter-wave band, such as a 28 GHz band or a 60 GHz band. Beamforming is a type of smart antenna and refers to a technique of concentrating a beam of an antenna on a specific terminal (for example, a receiving device), and a smart antenna may be implemented by using a large number of antennas to improve efficiency. Implementing a large number of antennas in both a transmitter and a receiver may be referred to as multiple-input and multiple output (MIMO). Because the complexity of reception is increased due to a large number of antennas, there may be an issue of a deterioration in the performance of channel estimation for beamforming in a high-frequency band, such as a millimeter-wave band. SUMMARY The disclosure provides an operation method of a user equipment and a user equipment performing the operation method. The operation method allows a range for channel estimation to be reduced by performing channel estimation for beamforming, based on channel estimation information including beam direction information of a base station, and allows a beam to be relatively quickly formed by performing channel estimation on the reduced range. According to an aspect of the disclosure, there is provided an operation method of a user equipment including a plurality of element antennas, the operation method including obtaining channel estimation information including beam direction information of a base station, performing channel estimation for beamforming based on the channel estimation information, and forming a beam based on the channel estimation, wherein the beam direction information of the base station is formed based on a geographic coordinate system. According to another aspect of the disclosure, there is provided an operation method of a user equipment in a wireless communication system, the operation method including selecting a best synchronization signal block (SSB) from among a plurality of SSBs received from a base station, obtaining beam direction information matched to the best SSB, obtaining 3-dimensional orientation information of the user equipment, calculating a transmission/reception angle of the user equipment based on the beam direction information and on the 3-dimensional orientation information of the user equipment, and forming a beam based on the transmission/reception angle of the user equipment. According to another aspect of the disclosure, there is provided a user equipment for wireless communication, the user equipment including a plurality of element antennas and a communication processor configured to perform channel estimation for beamforming based on channel estimation information including beam direction information of a base station and form a beam based on the channel estimation, wherein the beam direction information is formed based on a geographic coordinate system. BRIEF DESCRIPTION OF THE DRAWINGS Embodiments will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which: FIG. 1 is a block diagram illustrating a wireless communication system according to one or more embodiments; FIG. 2 is a flowchart illustrating an operation method of a user equipment in a wireless communication system, according to one or more embodiments; FIG. 3 is a graph illustrating channel estimation for beamforming, which is performed by a user equipment under the assumption of a far field situation, according to one or more embodiments; FIG. 4 is a graph illustrating channel estimation for beamforming, which is performed by a user equipment under the assumption of a near field situation, according to one or more embodiments; FIG. 5 is a flowchart illustrating an operation method of a user equipment in a wireless communication system, according to one or more embodiments; FIG. 6 is a block diagram illustrating beam direction information received by a user equipment in a wireless communication system, according to one or