Adaptive Contention Window Sizing for 5G NR-U Code Block Group Retransmissions
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Solution Overview
Problem
In wireless communication systems, especially those operating in unlicensed spectrum, existing technologies face challenges in efficiently adjusting contention window sizes for code block group based retransmissions, which affects fair coexistence with incumbent technologies and medium access.
Innovation Solution
A method for determining contention window size updates by identifying reference bursts and analyzing hybrid automatic repeat request feedbacks to adjust the contention window size for listen-before-talk procedures, specifically tailored for code block group based retransmissions in 5G New Radio systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the contention window size is adjusted based on HARQ feedback for code block group based retransmissions, then the spectral efficiency is improved and retransmission overhead is reduced, but the complexity of medium access control increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the contention window size based on HARQ feedback metrics. The system monitors feedback from code block group retransmissions and modifies the contention window parameters accordingly, transforming static medium access parameters into adaptive ones that respond to real-time channel conditions and transmission success rates.
Solution Approach 2:
The patent implements feedback mechanisms by utilizing HARQ feedback from code block group retransmissions to inform contention window size adjustments. The system collects feedback information about transmission success/failure and uses this feedback loop to continuously optimize the contention window size, creating a closed-loop control system for medium access.
2Reliability
If the listen-before-talk procedure uses a larger contention window size, then the fair coexistence with incumbent technologies is improved, but the medium access efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the contention window size adaptive rather than static. The system dynamically adjusts the contention window size based on observed HARQ feedback and channel conditions, allowing it to transition between larger sizes (for fair coexistence) and smaller sizes (for efficient access) depending on the operational context and transmission success rates.
Solution Approach 2:
The patent changes the contention window parameter from a fixed value to a dynamically adjustable parameter. By monitoring HARQ feedback and channel conditions, the system modifies the contention window size to balance between fair coexistence requirements (larger windows) and medium access efficiency requirements (smaller windows).
3Loss of substance
If the contention window size is optimized for code block group based retransmissions, then the retransmission overhead is reduced, but the complexity of determining the contention window size increases
Solution Approach 1:
The patent uses feedback from code block group retransmissions to determine contention window size adjustments. By monitoring HARQ feedback indicators that reflect transmission success and failure rates, the system automatically adjusts the contention window size without requiring complex manual configuration or external intervention.
Solution Approach 2:
The system performs self-service by autonomously determining and adjusting its own contention window size based on observed HARQ feedback. The wireless device monitors its own transmission performance and automatically modifies medium access parameters without external control, enabling self-optimization of retransmission overhead.
Data Source
AI summary
Apparatuses, systems, and methods for performing contention window size updates for code block group based retransmission configurations in a wireless communication system. A code block group based wireless communication may be performed in unlicensed spectrum. A reference burst of the code block group based wireless communication may be identified. One or more of a number of acknowledgements or a number of negative acknowledgements associated with the reference burst may be identified. A contention window size adjustment may be determined based at least in part on one or more of the number of acknowledgements or the number of negative acknowledgements associated with the reference burst.