PUSCH Repetition Transport Block Scaling for Limited Uplink Coverage
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Solution Overview
Problem
Existing wireless communication systems face challenges in determining optimal transport block sizes for physical uplink shared channel (PUSCH) repetitions, particularly in uplink limited coverage scenarios, leading to reduced transmission reliability and inefficient resource utilization.
Innovation Solution
The system determines transport block sizes based on a set of PUSCH resources corresponding to both nominal and actual repetitions, allowing for scaled-up transport block sizes to improve coding rate and power spectrum density, thereby enhancing transmission reliability and network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transport block size is determined based on single-slot resources for PUSCH repetitions, then device complexity is reduced, but transmission reliability deteriorates in uplink limited coverage scenarios
Solution Approach 1:
The patent transitions from determining transport block size based on single-slot resources to considering multi-slot repetition resources. By aggregating resources across multiple slots (K slots), the system effectively adds a temporal dimension to resource calculation, enabling larger transport block sizes that improve transmission reliability in uplink limited coverage scenarios without excessively increasing device complexity.
Solution Approach 2:
The patent introduces a scaling mechanism that changes the transport block size parameter based on the number of repetitions K. The formula TBS_scaled = TBS × (K × η) dynamically adjusts the transport block size by changing key parameters (K for number of repetitions, η for resource scaling factor), thereby improving transmission reliability while maintaining manageable device complexity through standardized calculation rules.
2Reliability
If transport block size is increased for PUSCH repetitions, then coding rate and power spectrum density improve, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements a dynamic transport block size determination mechanism that adapts to the actual number of repetitions K and resource scaling factor η. Rather than using fixed sizes, the system dynamically calculates TBS_scaled based on actual channel conditions and repetition configurations, optimizing the balance between transmission reliability and resource utilization efficiency for each specific scenario.
Solution Approach 2:
The base station provides feedback through downlink control information (DCI) to indicate the transport block size and repetition configuration to the user equipment. This feedback mechanism enables closed-loop optimization where the base station can adjust TBS and K based on uplink channel quality measurements, ensuring efficient resource utilization while maintaining high transmission reliability.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine a transport block size based at least in part on a set of physical uplink shared channel resources corresponding to a set of physical uplink shared channel repetitions that are configured to be transmitted over at least one repetition unit comprising at least one nominal repetition and at least one actual repetition. The UE may transmit the set of physical uplink shared channel repetitions based at least in part on the transport block size. Numerous other aspects are provided.