PUSCH Repetition RV Sequence Adjustment for PUCCH Overlap
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Solution Overview
Problem
In 5G NR systems, there is no definitive method to ensure normal transmission of a PUSCH for repetition transmission when it overlaps with a PUCCH, leading to potential loss of accurate information and transmission performance issues.
Innovation Solution
A method where the redundant version (RV) of subsequent PUSCHs in a group for repetition transmission is determined based on a preset RV, ensuring that the transmission continues without interruption by adjusting the RV sequence accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PUSCH for repetition transmission overlaps with a PUCCH carrying SR or high-priority UCI, then the PUSCH is dropped to ensure control information transmission, but the transmission reliability and coverage improvement purpose of repetition transmission is compromised
Solution Approach 1:
The patent applies dynamics by making the RV sequence adaptive rather than fixed. When a PUSCH is dropped due to overlap with PUCCH, the system dynamically adjusts the RV sequence of subsequent PUSCHs to maintain transmission reliability. The terminal determines whether to continue the original RV sequence or restart from an initial RV based on detection of the dropped PUSCH, allowing the system to adapt to changing transmission conditions while maintaining coverage enhancement goals
Solution Approach 2:
The patent implements feedback mechanisms where the terminal monitors the transmission status of PUSCHs in the repetition group. When a PUSCH is dropped or not transmitted, the terminal provides feedback by detecting the overlap condition and adjusting the RV sequence accordingly. This feedback loop ensures that the network can correctly decode the repeated transmissions by understanding which RVs were actually sent, maintaining reliability despite the PUCCH overlap
2Reliability
If the RV sequence is not adjusted when a PUSCH is dropped, then the transmission process is simple, but the network cannot correctly decode subsequent PUSCHs and transmission reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining RV sequences and establishing rules for adjusting them when drops occur. The terminal is configured with initial RV values and predetermined sequences before transmission begins. When a PUSCH is dropped, the terminal can quickly determine the next RV based on pre-established rules rather than calculating from scratch, reducing the time loss while ensuring decoding accuracy
Solution Approach 2:
The patent changes the RV parameter dynamically based on transmission conditions. When a PUSCH is dropped due to PUCCH overlap, the system modifies the RV sequence parameter of subsequent PUSCHs - either continuing the original sequence or restarting from an initial RV. This parameter adjustment ensures that the network can correctly interpret and decode the remaining repetitions without requiring additional time for retransmission
3Length of stationary object
If PUSCH repetition transmission is used to improve coverage, then more PUSCHs are transmitted occupying more slots, but the overlap with PUCCH becomes more frequent increasing the chance of transmission interruption
Solution Approach 1:
The patent ensures continuity of useful action by maintaining the PUSCH repetition transmission process even when individual PUSCHs are dropped due to PUCCH overlap. When a drop is detected, the system adjusts the RV sequence of subsequent PUSCHs to continue the repetition transmission without interruption. This allows the transmission to maintain its extended duration for coverage improvement while ensuring that the remaining repetitions can still be correctly decoded, preserving transmission continuity
Data Source
AI summary
A transmission method for a physical uplink shared channel, a terminal and a network device are disclosed. The method on the terminal side includes: when at least one physical uplink shared channel (PUSCH) using a preset redundant version (RV) in a group of PUSCHs for repetition transmission is dropped or stopped, determining, based on the preset RV, an RV of at least one PUSCH subsequent to the PUSCH that is dropped or stopped in the group of PUSCHs for repetition transmission; sending a corresponding PUSCH according to the determined RV.