US-12621024-B2 - Method and apparatus for sidelink transmission in wireless communication system

Abstract

An operating method of a first device which communicates with a second device based on time division duplex (TDD), includes: receiving a first signal from the second device; estimating a channel between the first device and the second device based on the first signal; generating, by applying singular value decomposition (SVD) to the estimated channel, a first orthogonal matrix including one or more left singular vectors, a diagonal matrix including one or more singular values, and a second orthogonal matrix including one or more right singular vectors; selecting at least one right singular vector from the second orthogonal matrix in descending order according to the one or more singular values, a number of the selected at least one right singular vector corresponding to a number of ranks of the channel; and transmitting, to the second device, a precoded physical sidelink shared channel (PSSCH) precoded based on a precoding matrix including the selected at least one right singular vector.

Inventors

• Byongok Lee
• Joohyun DO
• Hyunseok Yu

Assignees

• SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date

20260505

Application Date

20230727

Priority Date

20221107

Claims (20)

1. 1 . An operating method of a first device which communicates with a second device based on time division duplex (TDD), the operating method comprising: receiving a first signal from the second device; estimating a channel between the first device and the second device based on the first signal; generating, by applying singular value decomposition (SVD) to the channel, a first orthogonal matrix comprising one or more left singular vectors, a diagonal matrix comprising one or more singular values, and a second orthogonal matrix comprising one or more right singular vectors; selecting at least one right singular vector from the second orthogonal matrix in descending order according to the one or more singular values, a number of the selected at least one right singular vector is equal to a rank number of the channel; and transmitting, to the second device, a precoded physical sidelink shared channel (PSSCH) precoded based on a precoding matrix comprising the selected at least one right singular vector.
2. 2 . The operating method of claim 1 , wherein the selecting the at least one right singular vector comprises: receiving, from the second device, channel quality information (CQI) and a rank indicator (RI); and determining the rank number of the channel based on the RI.
3. 3 . The operating method of claim 2 , wherein the rank number of the channel determined based on the RI is 1 or 2.
4. 4 . The operating method of claim 1 , wherein the first signal is based on a single port, and wherein the first signal comprises at least one of a PSSCH, a physical sidelink feedback channel (PSFCH), a sidelink primary synchronization signal (P-SSS), a sidelink secondary synchronization signal (S-SSS), or a physical sidelink broadcast channel (PSBCH).
5. 5 . The operating method of claim 4 , wherein a number of rows of the channel is 1, and wherein the first orthogonal matrix comprises a one by one matrix.
6. 6 . The operating method of claim 1 , wherein the first signal comprises a PSSCH based on N multi-ports, and N is an integer greater than or equal to 2.
7. 7 . The operating method of claim 6 , wherein a number of rows of the channel corresponds to N, and the first orthogonal matrix comprises an N by N matrix.
8. 8 . The operating method of claim 1 , further comprising: receiving, from the second device, a physical sidelink feedback channel (PSFCH) indicating acknowledgement of the precoded PSSCH.
9. 9 . The operating method of claim 1 , wherein the estimating the channel comprises estimating the channel from the first device to the second device based on the first signal and the TDD.
10. 10 . An operating method of a first device which communicates with a second device based on time division duplex (TDD), the operating method comprising: receiving, from the second device, a first signal which is based on a single port or two ports; estimating a channel matrix between the first device and the second device based on the first signal; determining a precoding matrix based on the channel matrix, the precoding matrix comprising a number of right singular vectors that is equal to a rank number of the channel matrix; and transmitting, to the second device, a precoded physical sidelink shared channel (PSSCH) precoded based on the precoding matrix to the second device, wherein the first signal based on the single port comprises at least one of a single port-PSSCH, a physical sidelink feedback channel (PSFCH), a sidelink primary synchronization signal (P-SSS), a sidelink secondary synchronization signal (S-SSS), or a physical sidelink broadcast channel (PSBCH), and wherein the first signal based on the two ports comprises a 2 port-PSSCH.
11. 11 . The operating method of claim 10 , wherein the first signal is based on the single port; and wherein the determining of the precoding matrix comprises: generating, by applying singular value decomposition (SVD) to the channel matrix, a first orthogonal matrix comprising one left singular vector, a diagonal matrix comprising one or more singular values, and a second orthogonal matrix comprising one or more right singular vectors; and selecting at least one right singular vector from the second orthogonal matrix in descending order according to the one or more singular values.
12. 12 . The operating method of claim 10 , wherein the first signal is based on the two ports; and wherein the determining the precoding matrix comprises: generating, by applying singular value decomposition (SVD) to the channel matrix, a first orthogonal matrix comprising two left singular vectors, a diagonal matrix comprising one or more singular values, and a second orthogonal matrix comprising one or more right singular vectors; and selecting at least one right singular vector from the second orthogonal matrix in descending order according to the one or more singular values.
13. 13 . The operating method of claim 10 , further comprising: receiving a transmit precoding matrix indicator (TPMI) from the second device, wherein the determining the precoding matrix comprises determining the precoding matrix based on the channel matrix and the TPMI.
14. 14 . A first device which communicates with a second device based on time division duplex (TDD), the first device comprising: a transceiver; a memory storing instructions; and a processor communicatively coupled to the transceiver and the memory, and configured to execute the instructions to: receive a first signal from the second device through the transceiver; estimate a channel between the first device and the second device based on the first signal; generate, by applying singular value decomposition (SVD) to the channel, a first orthogonal matrix comprising one or more left singular vectors, a diagonal matrix comprising one or more singular values, and a second orthogonal matrix comprising one or more right singular vectors; select at least one right singular vector from the second orthogonal matrix in descending order according to the one or more singular values, a number of the selected at least one right singular vector is equal to a rank number of the channel; and transmit, to the second device through the transceiver, a precoded physical sidelink shared channel (PSSCH) precoded based on a precoding matrix and comprising the selected at least one right singular vector.
15. 15 . The first device of claim 14 , wherein the processor is further configured to: receive channel quality information (CQI) and a rank indicator (RI) from the second device through the transceiver; and determine the rank number of the channel based on the RI.
16. 16 . The first device of claim 15 , wherein the rank number of the channel determined based on the RI comprises 1 or 2.
17. 17 . The first device of claim 14 , wherein the first signal is based on a single port, and wherein the first signal comprises at least one of a PSSCH, a physical sidelink feedback channel (PSFCH), a sidelink primary synchronization signal (P-SSS), a sidelink secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH).
18. 18 . The first device of claim 17 , wherein a number of rows of the channel is 1, and wherein the first orthogonal matrix comprises a one by one matrix.
19. 19 . The first device of claim 14 , wherein the first signal comprises a PSSCH based on N multi-ports, and N is an integer greater than or equal to 2.
20. 20 . The first device of claim 19 , wherein a number of rows of the channel corresponds to N, and wherein the first orthogonal matrix comprises an N by N matrix.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims benefit of priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2022-0147378, filed on Nov. 7, 2022, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety. BACKGROUND The present disclosure relates to a method and apparatus for sidelink transmission in a wireless communication system, and more particularly, to a method and apparatus for sidelink transmission using multiple antennas. To meet the increase in demand with respect to wireless data traffic after the commercialization of 4th generation (4G) communication systems, considerable efforts have been made to develop pre-5th generation (5G) communication systems or 5G communication systems. For this reason, the 5G or pre-5G communication system may also be referred to as a beyond 4G network communication system and/or a post long term evolution (LTE) system. In order to attempt to achieve a high data rate, related 5G communication systems may be implemented using a super-high frequency band such as, but not limited to, a millimeter wave band (mmWave) (e.g., a band of about 60 GHz). To potentially reduce propagation loss of radio waves and/or potentially increase a transmission range of radio waves in the ultra-high frequency bands, features such as, but not limited to, beamforming, massive multiple-input multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large-scale antenna techniques may be under discussion. Alternatively or additionally, the Internet may be evolving from a human-oriented connectivity network, where humans generate and/or consume information, to an Internet of Things (IoT) network, where distributed entities (e.g., things) send, receive, and/or process information without human intervention. Consequently, an Internet of Everything (IoE) technology in which big data processing technology via a connection with a cloud server or the like may be combined with the IoT technology may be emerging. To implement IoT, various technological elements, such as, but not limited to, sensing technology, wired/wireless communication and network infrastructures, service interface technology, and security technology, may be required, such that technologies related to sensor networks for connecting objects, machine-to-machine (M2M) communication, and machine-type communication (MTC) may have been studied. In an IoT environment, intelligent Internet (or information) technology (IT) services may be provided to collect and/or analyze data obtained from objects connected to each other to create new value in human life. For example, IoT may be applied to fields, such as, but not limited to, smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health care, smart home appliances, and/or advanced medical services, through convergence and integration of existing IT and various industries. In this regard, various attempts to apply the 5G communication system to the IoT network may have being made. For example, 5G communication, such as sensor networks, M2M communication, MTC, and the like, may have been attempted by using techniques such as, but not limited to, beamforming, MIMO, array antennas, and the like. Sidelink may refer to a direct communication scheme between two devices without participation of a base station when transmitting and/or receiving data traffic. Direct communication between terminals using sidelink communication may be applied to, for example, vehicle-to-everything (V2X) and public safety networks to provide various services to users, among other fields. Thus, there may be an increased demand for data transmissions using sidelink communications. SUMMARY Example embodiments of the present disclosure provide methods and devices for performing sidelink transmission using multiple antennas. According to an aspect of an example embodiment, an operating method of a first device which communicates with a second device based on time division duplex (TDD), includes: receiving a first signal from the second device; estimating a channel between the first device and the second device based on the first signal; generating, by applying singular value decomposition (SVD) to the estimated channel, a first orthogonal matrix including one or more left singular vectors, a diagonal matrix including one or more singular values, and a second orthogonal matrix including one or more right singular vectors; selecting at least one right singular vector from the second orthogonal matrix in descending order according to the one or more singular values, a number of the selected at least one right singular vector corresponding to a number of ranks of the channel; and transmitting, to the second device, a precoded physical sidelink shared channel (PSSCH) precoded based on a precoding matrix including the selected at least one right singular vector. Accordin