Beam-Aware DCI for Low-Delay Uplink Channel Access
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in channel access procedures when operating in unlicensed bands, particularly in 5G systems providing multiple services like eMBB, mMTC, and URLLC, where the need for flexible and efficient channel access methods is crucial to avoid data loss and ensure high data transfer rates.
Innovation Solution
A method and apparatus for determining a channel access procedure by including beam-related information in downlink control information (DCI) to enable uplink signal transmission without a channel access procedure, allowing for efficient uplink data transmission by identifying optimal beams for transmission based on arbitrary integer values within a contention window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a channel access procedure is performed in unlicensed bands, then collision avoidance and reliable communication are improved, but transmission delay and complexity increase
Solution Approach 1:
The base station performs channel access procedures in advance before scheduling uplink transmissions to UEs. The results of these preliminary channel access attempts are then included in DCI messages sent to UEs, allowing UEs to skip performing their own channel access procedures and directly transmit uplink signals when the channel is confirmed available, thereby reducing transmission delay while maintaining reliability
Solution Approach 2:
The base station provides feedback to UEs about the results of its channel access procedures through DCI messages. This feedback mechanism allows UEs to make informed transmission decisions based on the base station's channel sensing results, eliminating the need for UEs to independently perform time-consuming channel access procedures while ensuring reliable communication
2Productivity
If beam-related information is included in DCI, then uplink transmission efficiency is improved, but DCI size and processing complexity increase
Solution Approach 1:
Beam-related information is merged with channel access results and bundled together in the DCI message. This combination allows the UE to receive both the channel availability status and beam selection information in a single control message, improving uplink transmission efficiency by enabling direct transmission when the channel is clear, while the integrated structure helps manage processing complexity through unified handling
Data Source
AI summary
The present invention relates to a method and a device for a channel access procedure in a wireless communication system. More specifically, the present invention relates to a method for performing a channel access procedure by a base station in a specific direction (or beam) in an unlicensed band. More specifically, the present invention proposes a method for configuring and generating downlink control information by a base station in order to transmit, to a terminal, a result of a channel access procedure performed in a specific direction, and a method for determining the information by the terminal. A method of a terminal in a communication system according to an embodiment of the present disclosure may comprise the steps of: receiving, from a base station, downlink control information (DCI) for scheduling of uplink signal transmission; checking beam-related information which is included in the DCI and indicates a beam for the uplink signal transmission; and performing the uplink signal transmission to the base station without a channel access procedure of the terminal on the basis of the beam indicated by the beam-related information.