Priority-Based Uplink LBT Access for Unlicensed Spectrum Sharing
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Solution Overview
Problem
The challenge of efficiently transmitting signals in a cellular wireless communication system using unlicensed frequency bands is exacerbated by interference from conventional unlicensed band devices, necessitating a robust coexistence mechanism to ensure communication quality and channel sharing.
Innovation Solution
A method and apparatus for uplink transmission in a wireless communication system that utilizes first and second type channel access, where the parameters for channel access are determined based on priorities included in the uplink grant, allowing for efficient channel access in unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If unlicensed band is used for cellular communication service, then spectrum availability is improved, but interference with conventional unlicensed band devices occurs and communication quality cannot be guaranteed
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting channel access parameters (contention window size, channel occupancy time, priority levels) based on channel conditions and traffic requirements. This allows the system to adapt its transmission behavior to minimize interference while maintaining efficient spectrum utilization in unlicensed bands
Solution Approach 2:
The patent implements dynamics through the Listen-Before-Talk (LBT) mechanism where devices continuously sense channel conditions and adjust their transmission parameters in real-time. The channel access priority class and contention window size are dynamically modified based on channel occupancy and interference conditions, enabling adaptive coexistence with conventional unlicensed band devices
2Productivity
If multiple communication facilities use unlicensed band simultaneously without limit, then spectrum utilization is improved, but communication quality guarantee becomes difficult
Solution Approach 1:
The patent applies preliminary action through the Listen-Before-Talk (LBT) procedure where devices perform channel sensing and clear channel assessment before transmitting data. This preliminary check ensures that transmissions only occur when the channel is clear, preventing collisions and maintaining reliable communication quality while allowing multiple facilities to share the unlicensed spectrum
Solution Approach 2:
The patent implements feedback mechanisms where transmission parameters are adjusted based on channel conditions and transmission outcomes. The base station receives feedback about channel quality and transmission success, then modifies subsequent channel access parameters accordingly, enabling multiple devices to efficiently share the spectrum while maintaining communication quality through continuous adaptation
Data Source
AI summary
The present invention relates to a method for performing uplink transmission to a base station through an unlicensed cell in a wireless communication system. In particular, the invention provides a method including: receiving, from the base station, an uplink grant scheduling the uplink transmission on one or more subframes; and performing the uplink transmission on the one or more subframes using one of a first type channel access or a second type channel access indicated in the uplink grant, wherein a parameter for the first type channel access is determined according to a priority included in the uplink grant, and wherein when the uplink grant indicates the second type channel access, the priority is a priority used in a downlink channel access of the base station.