Autonomous Uplink Transmission Termination for Unlicensed Band Interference

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently transmitting uplink signals in unlicensed bands, particularly in minimizing interference and optimizing channel access procedures for reliable and efficient data transmission.

Innovation Solution

The method involves a user equipment (UE) receiving downlink control information to schedule uplink transmissions immediately after autonomous uplink (AUL) transmission, with options to terminate AUL transmission before uplink transmission or perform both transmissions continuously, using distinct channel access procedures and adjusting contention window sizes based on priority classes and acknowledgement information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If autonomous uplink (AUL) transmission is performed continuously without termination, then transmission efficiency is improved, but interference with scheduled uplink transmission increases

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The UE terminates the ongoing AUL transmission a certain time interval before the scheduled uplink transmission to prevent interference. This preliminary termination action ensures that the channel is clear for the scheduled transmission while maintaining efficient use of the unlicensed band by allowing continuous operation when no conflict exists.

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If AUL transmission is terminated before scheduled uplink transmission, then interference is minimized, but channel access continuity is reduced

Engineering Contradiction:

ImproveinterferenceVSAvoidchannel access continuity

Core Design Contradiction:

Object-affected harmful factorsVSDuration of action of stationary object

Solution Approach 1:

The system dynamically adjusts the AUL transmission behavior based on scheduling information. When scheduled uplink transmission is detected, the AUL transmission is terminated in advance; when no scheduling is present, continuous AUL transmission is maintained. This dynamic adaptation resolves the contradiction by making the termination conditional rather than fixed.

Inventive Principle:

Principle #15Dynamics

3Reliability

If contention window size is conservatively adjusted, then channel access reliability is improved, but transmission opportunity frequency decreases

Engineering Contradiction:

Improvechannel access reliabilityVSAvoidtransmission opportunity frequency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The contention window size is adjusted based on the priority class of the transmission and channel conditions. By changing the parameter dynamically rather than using a fixed conservative value, the system achieves reliable channel access when needed while maintaining higher transmission opportunity frequency when conditions permit.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11751240B2Method of transmitting uplink signal from user equipment in a wireless communication system supporting unlicensed band and apparatus supporting the same

Publication Date: 2023.09.05 LG ELECTRONICS INC

AI summary

Disclosed herein is a method of transmitting a UL signal from a user equipment (UE) in a wireless communication system supporting an unlicensed band and apparatuses for supporting the same. More specifically, the present invention provides an embodiment in which the UE performs autonomous uplink transmission and scheduled uplink transmission through the unlicensed band, a method of adjusting contention window size when the UE perform the autonomous uplink transmission through the unlicensed band, and an embodiment of performing the autonomous uplink transmission based on the method.