Uplink Channel Access Priority for Unlicensed Band Coexistence
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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 wireless communication 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 priority for channel access is determined based on an uplink grant, with parameters like contention window size and maximum channel occupancy time adjusted accordingly.
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 communication quality guarantee deteriorates
Solution Approach 1:
The patent implements dynamic channel access mechanisms where transmission parameters such as contention window size and channel occupancy time are adjusted based on channel conditions and priority levels. This allows the system to adaptively manage unlicensed band resources while maintaining communication quality through real-time parameter optimization.
Solution Approach 2:
The invention changes physical parameters of channel access by introducing priority-based contention window sizes and maximum channel occupancy times. These parameter variations enable differentiated access control, where high-priority transmissions can secure channel access more reliably while low-priority transmissions yield, thus guaranteeing communication quality for critical services.
2Adaptability or versatility
If unlicensed band is used for cellular communication service, then spectrum shortage problem is alleviated, but interference with conventional wireless communication devices occurs
Solution Approach 1:
The patent applies preliminary anti-action by implementing listen-before-talk (LBT) procedures and channel sensing mechanisms before transmission. Devices perform clear channel assessment and adjust their transmission parameters in advance to avoid interfering with conventional wireless communication devices already using the unlicensed band.
Solution Approach 2:
The invention introduces channel access priority classes and contention window mechanisms as intermediaries between cellular communication devices and conventional unlicensed band devices. These intermediary mechanisms facilitate fair coexistence by mediating channel access rights and reducing direct interference through structured priority-based access control.
3Productivity
If multiple communication facilities use unlicensed band simultaneously, then spectrum utilization is improved, but channel access reliability deteriorates
Solution Approach 1:
The patent segments channel access into multiple priority classes (e.g., priority 1 through 4) with differentiated contention window sizes and channel occupancy times. This segmentation allows multiple communication facilities to simultaneously access the unlicensed band in an organized manner, where each facility can reliably access the channel according to its priority level while maintaining high overall spectrum utilization.
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.