US-12628208-B2 - Method for performing channel access for transmission of downlink channel in wireless communication system, and device therefor

US12628208B2US 12628208 B2US12628208 B2US 12628208B2US-12628208-B2

Abstract

A method by which a base station transmits a downlink channel in a wireless communication system comprises the steps of: selecting a channel access priority class (CAPC) from among a plurality of CAPCs preset for the transmission of a downlink channel; performing channel access on a first channel on the basis of a parameter set in response to the CAPC; and transmitting, to a terminal, one or more physical downlink control channels (PDCCHs) on the first channel.

Inventors

Minseok Noh
Kyungjun CHOI
Jinsam Kwak

Assignees

WILUS INSTITUTE OF STANDARDS AND TECHNOLOGY INC.

Dates

Publication Date: 20260512
Application Date: 20210118
Priority Date: 20200117

Claims (8)

1 . A method for use by a wireless communication device of a wireless communication system, the method comprising: performing a channel access procedure to transmit a downlink channel based on a channel access priority class (CAPC); and performing a data transmission via the downlink channel, wherein when the data transmission includes a unicast data, the CAPC corresponds to a CAPC applicable to the unicast data, wherein when the data transmission includes a non-unicast data that is not multiplexed with the unicast data, the CAPC corresponds to a CAPC having a highest priority among preconfigured multiple CAPCs.
2 . The method of claim 1 , wherein when the data transmission includes the unicast data, the downlink channel is associated with a shared channel.
3 . The method of claim 1 , wherein when the data transmission includes the non-unicast data, the downlink channel is associated with a control channel.
4 . The method of claim 1 , wherein when the data transmission includes the non-unicast data, the data transmission does not include information for scheduling a shared channel.
5 . A wireless communication device configured to operate in a wireless communication system, the wireless communication device comprising: a communication module; and a processor configured to control the communication module, wherein the processor is configured to: perform a channel access procedure to transmit a downlink channel based on a channel access priority class (CAPC), perform a data transmission via the downlink channel, wherein when the data transmission includes a unicast data, the CAPC corresponds to a CAPC applicable to the unicast data, wherein when the data transmission includes a non-unicast data that is not multiplexed with the unicast data, the CAPC corresponds to a CAPC having a highest priority among preconfigured multiple CAPCs.
6 . The wireless communication device of claim 5 , wherein when the data transmission includes the unicast data, the downlink channel is associated with a shared channel.
7 . The wireless communication device of claim 5 , when the data transmission includes the non-unicast data, wherein the downlink channel is associated with a control channel.
8 . The wireless communication device of claim 5 , wherein when the data transmission includes the non-unicast data, the data transmission does not include information for scheduling a shared channel.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is the National Stage filing under 35 U.S.C. 371 of International Application No. PCT/KR2021/000668, filed on Jan. 18, 2021, which claims the benefit of KR Provisional Application No. 10-2020-0006839, filed on Jan. 17, 2020, the contents of which are all hereby incorporated by reference herein in their entirety. TECHNICAL FIELD The present specification relates to a wireless communication system and, more specifically, to a method for performing channel access for transmission of a downlink channel, and a device therefor. BACKGROUND ART After commercialization of 4th generation (4G) communication system, in order to meet the increasing demand for wireless data traffic, efforts are being made to develop new 5th generation (5G) communication systems. The 5G communication system is called as a beyond 4G network communication system, a post LTE system, or a new radio (NR) system. In order to achieve a high data transfer rate, 5G communication systems include systems operated using the millimeter wave (mmWave) band of 6 GHz or more, and include a communication system operated using a frequency band of 6 GHz or less in terms of ensuring coverage so that implementations in base stations and terminals are under consideration. A 3rd generation partnership project (3GPP) NR system enhances spectral efficiency of a network and enables a communication provider to provide more data and voice services over a given bandwidth. Accordingly, the 3GPP NR system is designed to meet the demands for high-speed data and media transmission in addition to supports for large volumes of voice. The advantages of the NR system are to have a higher throughput and a lower latency in an identical platform, support for frequency division duplex (FDD) and time division duplex (TDD), and a low operation cost with an enhanced end-user environment and a simple architecture. For more efficient data processing, dynamic TDD of the NR system may use a method for varying the number of orthogonal frequency division multiplexing (OFDM) symbols that may be used in an uplink and downlink according to data traffic directions of cell users. For example, when the downlink traffic of the cell is larger than the uplink traffic, the base station may allocate a plurality of downlink OFDM symbols to a slot (or subframe). Information about the slot configuration should be transmitted to the terminals. In order to alleviate the path loss of radio waves and increase the transmission distance of radio waves in the mmWave band, in 5G communication systems, beamforming, massive multiple input/output (massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beamforming, hybrid beamforming that combines analog beamforming and digital beamforming, and large scale antenna technologies are discussed. In addition, for network improvement of the system, in the 5G communication system, technology developments related to evolved small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network, device to device communication (D2D), vehicle to everything communication (V2X), wireless backhaul, non-terrestrial network communication (NTN), moving network, cooperative communication, coordinated multi-points (CoMP), interference cancellation, and the like are being made. In addition, in the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), which are advanced coding modulation (ACM) schemes, and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA), which are advanced connectivity technologies, are being developed. Meanwhile, in a human-centric connection network where humans generate and consume information, the Internet has evolved into the Internet of Things (IoT) network, which exchanges information among distributed components such as objects. Internet of Everything (IoE) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, so that in recent years, technologies such as sensor network, machine to machine (M2M), and machine type communication (MTC) have been studied for connection between objects. In the IoT environment, an intelligent internet technology (IT) service that collects and analyzes data generated from connected objects to create new value in human life can be provided. Through the fusion and mixture of existing information technology (IT) and various industries, IoT can be applied to fields such as smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliance, and advanced medical service. Accordingly, various attempts have been made to ap