NR-U RACH Gap Management for PUSCH Transmission
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Solution Overview
Problem
In new radio unlicensed (NR-U) communications, the two-step random access channel (RACH) procedure often results in transmission complexity due to varying symbol gaps between preamble and physical uplink shared channel (PUSCH) transmissions, which can lead to inefficiencies and invalid resource allocations.
Innovation Solution
A method is introduced where user equipment (UE) determines the gap length between RACH preamble and PUSCH transmissions, selects an appropriate transmission procedure based on the gap condition, and performs the PUSCH transmission accordingly, using cyclic prefix extensions or listen-before-talk (LBT) procedures to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If two-step RACH procedure is used in NR-U communications, then transmission speed and flexibility are improved, but transmission complexity increases due to varying symbol gaps between preamble and PUSCH transmissions
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the cyclic prefix extension length based on the detected gap length between RACH preamble and PUSCH transmissions. When the gap falls within a valid range, the cyclic prefix is extended to fill the gap; when the gap exceeds the valid range, the transmission is cancelled. This parameter-based adaptation resolves the technical contradiction by maintaining transmission speed while reducing complexity through automated gap management.
2Productivity
If cyclic prefix extension is used to fill symbol gaps, then resource utilization efficiency is improved, but transmission procedure complexity increases
Solution Approach 1:
The patent implements dynamics by making the cyclic prefix extension length variable rather than fixed. The system dynamically adjusts the extension length according to the actual gap detected between preamble and PUSCH transmissions. This dynamic approach improves resource utilization efficiency by fully utilizing available gap resources while managing complexity through standardized adjustment rules.
Solution Approach 2:
The patent changes the cyclic prefix parameter dynamically based on gap conditions. By monitoring the gap length and adjusting the cyclic prefix extension parameter accordingly, the system optimizes resource utilization without requiring complex procedural changes, as the adjustment follows predefined parameter rules.
3Adaptability or versatility
If gap length is not properly managed, then transmission flexibility is maintained, but invalid resource allocations occur leading to transmission inefficiency
Solution Approach 1:
The patent applies preliminary action by detecting and evaluating the gap length between RACH preamble and PUSCH transmissions before proceeding with PUSCH transmission. This preliminary gap assessment allows the system to determine whether the gap is valid for cyclic prefix extension or whether transmission should be cancelled, thereby preventing invalid resource allocations and improving transmission efficiency while maintaining flexibility through condition-based decision-making.
Data Source
AI summary
This disclosure relates to random access channel (RACH) enhancements for new radio unlicensed (NR-U) communications. Specifically, the present aspects include determining whether a gap length between a two-step random access channel (RACH) preamble transmission and a physical uplink shared channel (PUSCH) transmission satisfies a gap condition. The present aspects further include selecting a transmission procedure associated with the determined gap length for the PUSCH transmission. The present aspects further include performing the PUSCH transmission in accordance with the selected transmission procedure.