Wireless Device Contention Window Adjustment for Unlicensed Band Access
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in channel access methods for user equipment (UE) in unlicensed bands, particularly in managing contention window sizes based on feedback information, which affects the reliability and latency of communication, especially in next-generation radio access technologies like 5G NR.
Innovation Solution
A method and device for efficiently accessing channels in unlicensed bands by transmitting data units, receiving feedback information, and adjusting the contention window size based on this feedback to determine channel access, allowing for flexible and independent setting of reference resources considering NR characteristics, even when subcarrier intervals differ.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contention window size is adjusted based on feedback information from overlapping reference durations, then channel access reliability is improved, but the complexity of managing reference resources increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the contention window size based on feedback information from overlapping reference durations. The base station configures multiple reference resources with different durations, and the UE provides feedback on which reference duration achieved better channel access. This feedback-driven parameter adjustment improves reliability while managing complexity through structured configuration options.
Solution Approach 2:
The patent implements dynamics by allowing flexible and independent setting of reference resources considering NR characteristics. The system can adaptively select and configure reference resources based on varying channel conditions and traffic requirements, enabling dynamic optimization of channel access reliability without fixed rigid structures.
2Productivity
If feedback information is received on data units with partially overlapping reference durations, then channel access efficiency is improved, but ambiguity in feedback interpretation may occur
Solution Approach 1:
The patent applies segmentation by dividing the feedback mechanism into distinct components: separate reference resources with different durations, and structured feedback information that identifies which reference duration was used. This segmentation allows the system to handle overlapping reference durations efficiently while maintaining clear feedback interpretation through explicit duration identification.
Solution Approach 2:
The patent implements feedback by having the UE provide explicit information about which reference duration achieved successful channel access. This feedback loop enables the base station to understand the results of different reference duration configurations and adjust future transmissions accordingly, improving efficiency while eliminating ambiguity through clear feedback signaling.
3Adaptability or versatility
If flexible reference resource configuration is implemented for different subcarrier intervals, then adaptability to NR characteristics is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by designing a reference resource configuration mechanism that works across different subcarrier intervals and NR characteristics. The same basic framework of configurable reference resources can be universally applied to various NR scenarios (e.g., different subcarrier spacings, different cell types), providing adaptability without requiring entirely separate configuration systems for each case.
Data Source
AI summary
Provided are a method for accessing a channel in an unlicensed band and a device using same method. The method is configured such that a wireless device transmits data units, receives feedback information about the data units, and adjusts a contention window size used in a determination of whether there is an access to the channel in the unlicensed band on the basis of the feedback information. The wireless device can adjust the contention window size by using feedback information about, from among the data units, data units which at least partially overlap in reference duration.