Temporal Bandwidth Part Adaptation in NR-U Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in dynamically adapting transmission bandwidth in listen before talk communication systems, particularly in scenarios with unlicensed bands, where efficient bandwidth management is crucial for interference avoidance and battery conservation.
Innovation Solution
The introduction of temporal bandwidth parts (BWP) that can dynamically adapt by modifying configuration parameters such as truncating, padding, or shifting existing bandwidth part configurations, allowing for flexible switching between different bandwidths based on radio resource control signaling, inactivity timers, and received signals to optimize transmission parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic bandwidth adaptation is implemented in listen before talk systems, then bandwidth efficiency and interference avoidance are improved, but system complexity increases
Solution Approach 1:
The patent divides the bandwidth into multiple bandwidth parts (BWPs) that can be independently configured and activated. Each BWP is a segment of the total bandwidth that can be selectively used based on interference conditions and traffic requirements, enabling fine-grained control for optimization without requiring complete system redesign
Solution Approach 2:
The system dynamically switches between different bandwidth parts based on real-time conditions including LBT outcomes, interference measurements, and traffic patterns. The bandwidth part selection is not fixed but adapts continuously, allowing the system to optimize bandwidth efficiency while managing complexity through algorithmic control rather than hardware complexity
2Adaptability or versatility
If multiple bandwidth parts are configured simultaneously, then adaptability to different transmission conditions is improved, but configuration complexity increases
Solution Approach 1:
Multiple bandwidth parts are pre-configured with their respective parameters (subcarrier spacing, cyclic prefix, bandwidth) before actual transmission occurs. This preliminary configuration allows the system to quickly switch between BWPs based on conditions without needing to reconfigure everything from scratch, thereby improving adaptability while managing configuration complexity through advance preparation
Solution Approach 2:
The bandwidth part configuration mechanism serves multiple functions: it enables bandwidth adaptation, interference avoidance, power saving, and traffic prioritization all through a unified framework. The same BWP configuration system handles diverse transmission scenarios, reducing overall system complexity compared to having separate mechanisms for each function
3Adaptability or versatility
If temporal bandwidth parts are introduced for dynamic adaptation, then transmission flexibility is improved, but processing requirements increase
Solution Approach 1:
Instead of continuously processing and adapting all bandwidth configurations, the system applies partial action by only actively managing and processing the parameters of the currently active bandwidth part. Other configured BWPs are maintained as templates but require minimal processing until needed, thereby reducing processing requirements while preserving transmission flexibility
Data Source
AI summary
An apparatus comprising means for: receiving a first bandwidth part configuration caused to support dynamic adaptation of transmission bandwidth part in listen before talk communication systems, the first bandwidth part configuration comprising at least two bandwidth parts: a first bandwidth part and at least one associated temporal bandwidth part; determining which of the at least two bandwidth parts is used for a transmission burst; determining for the transmission burst a second, temporal, bandwidth part configuration caused to determine the transmission parameters for the transmission burst based on the at least one associated temporal bandwidth part and the determining which of the at least two bandwidth parts is used for the transmission burst.