Downlink Channel Access Priority for Unlicensed Wireless Control
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Solution Overview
Problem
The challenge in wireless communication systems is to ensure efficient channel access for downlink channels, particularly in unlicensed frequency bands where interference with existing devices is a concern, and to develop a robust coexistence mechanism for LTE and NR technologies.
Innovation Solution
A method for selecting a channel access priority class (CAPC) during channel access for downlink channel transmission, involving a base station that configures and transmits physical downlink control channels (PDCCHs) based on preconfigured parameters, and a terminal that receives these channels to manage channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel access is performed in unlicensed frequency bands, then wireless data traffic demand can be met, but interference with existing devices increases and communication quality deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically selecting channel access priority classes (CAPCs) based on traffic type and modifying channel access parameters (such as backoff counter, contention window size) according to the selected CAPC. This allows the system to adapt channel access behavior to minimize interference while maintaining high data traffic capacity in unlicensed bands.
Solution Approach 2:
The patent implements dynamics by making the channel access priority class selection adaptive rather than fixed. The base station dynamically determines which CAPC to use based on real-time traffic characteristics, and the terminal dynamically adjusts its behavior based on the selected CAPC, enabling flexible coexistence with existing devices.
2Productivity
If multiple channel access priority classes are configured, then channel sharing efficiency improves, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the channel access control into discrete priority classes (CAPCs), each with predefined parameters. This segmentation allows the complex channel sharing problem to be managed through standardized classes rather than continuous optimization, reducing implementation complexity while maintaining efficient sharing.
Solution Approach 2:
The patent implements preliminary action by preconfiguring multiple channel access priority classes with their respective parameters before actual channel access is needed. This allows the system to quickly select and apply appropriate parameters without complex real-time calculations, improving channel sharing efficiency while keeping control logic manageable.
3Reliability
If downlink control channels are transmitted with high priority, then communication quality improves, but channel access conflicts with uplink transmissions increase
Solution Approach 1:
The patent applies local quality by assigning different channel access characteristics to different traffic types and directions. Downlink control channels can use higher priority CAPCs to ensure reliable transmission, while uplink data channels can use lower priority classes, allowing each traffic type to have optimized access parameters that minimize conflicts.
Data Source
AI summary
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.