PUSCH Repetition with Dynamic Redundancy Version Selection
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Solution Overview
Problem
Existing mobile communications technologies face challenges in ensuring diverse redundancy versions for Physical Uplink Shared Channel (PUSCH) and Physical Random Access Channel (PRACH) transmissions, leading to suboptimal decoding performance and resource inefficiencies, particularly in coverage enhancement scenarios.
Innovation Solution
Implementing mechanisms for varying precoding matrices in non-codebook based PUSCH repetitions, dynamic slot availability determination for Type A PUSCH repetitions, and PRACH signal aggregation with beam refinement to enhance decoding and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUSCH transmissions are repeated to improve decoding reliability, then the likelihood of successful decoding is improved, but all redundancy versions may be the same leading to suboptimal performance
Solution Approach 1:
The patent implements dynamic selection of redundancy versions for PUSCH repetitions based on slot availability and transmission conditions. The UE determines the second redundancy version dynamically based on whether the second slot is available for earliest repetition, allowing the system to adapt redundancy version selection to actual channel conditions and resource availability, thereby achieving both reliable decoding and version diversity.
2Productivity
If PUSCH repetitions are scheduled in consecutive slots, then transmission efficiency is improved, but slot availability may not be guaranteed leading to misalignment
Solution Approach 1:
The patent employs feedback mechanisms where the UE monitors slot format indicators (SFI) and determines slot availability dynamically before transmitting PUSCH repetitions. The UE receives feedback about uplink slot availability from the network and adjusts its repetition scheduling accordingly, ensuring that repetitions are transmitted only in slots that are confirmed to be available, thus maintaining both efficiency and reliability.
3Reliability
If PRACH transmissions are aggregated for coverage enhancement, then coverage is improved, but resource overhead increases
Solution Approach 1:
The patent implements PRACH aggregation with selective beam refinement where not all aggregated transmissions require full beam refinement procedures. The system performs beam refinement only when necessary based on channel conditions and coverage requirements, applying partial action to reduce resource overhead while still achieving the necessary coverage enhancement through selective repetition and beam management.
Data Source
AI summary
A method for PUSCH repetition or PRACH aggregation. In some embodiments, the method includes transmitting, by a User Equipment (UE), in a first slot, a first Physical Uplink Shared Channel (PUSCH) transmission including a set of coded bits selected from a circular buffer of the UE based on a first redundancy version (RV); determining, by the UE, that a second slot is available for an earliest repetition of the first PUSCH transmission, the second slot being later than the slot immediately following the first slot; determining, by the UE, based on the second slot, a second redundancy version; and transmitting, by the UE, in the second slot, a second PUSCH transmission including a set of coded bits selected from the circular buffer of the UE based on the second redundancy version, the second PUSCH transmission being a repetition of the first PUSCH transmission.