NR Subcarrier Spacing Scheduling for High-Band HARQ Timing
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Solution Overview
Problem
The increase in subcarrier spacing beyond 120 KHz in 5G NR communication systems, particularly in frequencies above 52.6 GHz, poses challenges to communication scheduling and HARQ processing due to reduced symbol duration, necessitating increased processing capabilities in UEs, which can lead to inefficiencies and resource overheads.
Innovation Solution
Adopting modified communication scheduling and HARQ processing techniques tailored to the increased subcarrier spacing, including adjustments to slot offsets and HARQ codebook structures, to manage processing demands and resource utilization effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If subcarrier spacing is increased beyond 120 KHz to support frequencies above 52.6 GHz, then data transmission capability is improved, but processing complexity in UEs increases
Solution Approach 1:
The patent segments the increased subcarrier spacing into manageable components by introducing multiple candidate slot offsets (K0 values) that are selectively applied based on specific conditions. This segmentation allows the system to handle high-frequency transmission requirements while breaking down the processing complexity into discrete, condition-based decisions rather than requiring continuous complex processing across the entire increased subcarrier spacing range.
Solution Approach 2:
The patent applies preliminary action by pre-defining multiple candidate slot offsets (K0 values) in advance, where each candidate corresponds to specific subcarrier spacing conditions. This allows the UE to quickly select an appropriate offset based on pre-established criteria rather than calculating optimal offsets in real-time, thereby reducing processing complexity while maintaining the ability to support increased subcarrier spacing for high-frequency transmissions.
2Speed
If subcarrier spacing is increased beyond 120 KHz, then communication speed is improved, but resource overhead increases
Solution Approach 1:
The patent introduces dynamic resource allocation by making the slot offset (K0) variable based on subcarrier spacing conditions. Instead of using a fixed resource allocation scheme that would waste resources at higher subcarrier spacings, the system dynamically selects from multiple candidate K0 values, allowing resource usage to adapt to the actual transmission requirements. This dynamic approach maintains communication speed while reducing unnecessary resource overhead.
Solution Approach 2:
The patent changes the parameter of slot offset (K0) based on subcarrier spacing conditions. By defining multiple candidate K0 values and selecting appropriate ones based on the actual subcarrier spacing being used, the system optimizes resource allocation to match the transmission parameters. This prevents resource waste that would occur with fixed parameter settings and ensures efficient resource utilization across different frequency ranges.
3Adaptability or versatility
If subcarrier spacing is increased beyond 120 KHz, then frequency range is extended, but symbol duration is reduced
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple candidate slot offsets (K0 values) that account for different symbol duration scenarios. By having these offsets prepared in advance, the system can compensate for the reduced symbol duration at higher subcarrier spacings without requiring real-time adjustments, thereby maintaining proper timing relationships across extended frequency ranges.
Solution Approach 2:
The patent changes the timing parameter (slot offset K0) based on subcarrier spacing and resulting symbol duration. By selecting from multiple candidate K0 values, the system adjusts the timing parameters to account for shorter symbol durations at higher frequencies, ensuring that resource allocation and scheduling remain accurate across the extended frequency range despite the reduced symbol duration.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods to provide reception and transmission in 5G NR at a frequency larger than 52.6 GHz and with a subcarrier spacing larger than 120 KHz.