Multiplexing Configured Grant Transmissions in Unlicensed NR
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Solution Overview
Problem
In 5G-NR systems operating on unlicensed spectrum, the challenge is to maintain fair coexistence with other technologies while ensuring efficient configured grant transmissions, particularly due to the degradation of scheduled UL transmission performance caused by contention-based protocols, which leads to increased latency and reduced bandwidth.
Innovation Solution
The implementation of multiplexing or dropping rules for Configured Grant (CG) PUSCH when it overlaps with legacy UL control information (e.g., HARQ-ACK, SR, CSI) is introduced, allowing for flexible resource allocation and prioritization to optimize transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If configured grant transmissions are implemented in unlicensed spectrum, then bandwidth utilization is improved, but coexistence with other technologies deteriorates due to contention-based protocols
Solution Approach 1:
The patent implements dynamic multiplexing rules that adapt transmission behavior based on channel conditions and collision detection. The system dynamically switches between different transmission modes (multiplexing vs. dropping CG PUSCH) based on whether PUCCH overlap is detected, allowing flexible adaptation to maintain both bandwidth utilization and fair coexistence in unlicensed spectrum
Solution Approach 2:
The patent introduces an intermediary mechanism (multiplexing rule) that mediates between CG PUSCH and legacy UL control information transmissions. This intermediary rule system determines whether to multiplex or drop transmissions based on overlap conditions, resolving the conflict between maintaining high bandwidth utilization and ensuring fair coexistence with other technologies
2Productivity
If multiplexing rules are implemented for CG PUSCH overlapping with legacy UL control information, then transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by establishing predetermined multiplexing rules before transmission occurs. The UE is configured with specific rules (e.g., multiplexing when PUCCH overlap is detected, dropping when not detected) in advance, which simplifies the decision-making process during actual transmission and reduces real-time complexity while maintaining high transmission efficiency
Solution Approach 2:
The patent implements local quality by applying different multiplexing strategies to different transmission scenarios. Instead of a uniform approach, the system applies specific rules based on local conditions (whether PUCCH overlap is detected, which cell group is involved), optimizing transmission efficiency for each specific case while keeping the overall system manageable
Data Source
AI summary
The present application relates to wireless devices, and more particularly to apparatus, systems, and methods for multiplexing Configured Grant (CG) transmissions in New Radio (NR) systems operating on unlicensed spectrum. In one embodiment, a method for signaling a wireless system is disclosed, comprising: determining, by a user equipment (UE), that a physical uplink control channel (PUCCH) overlaps with a configured grant (CG) physical uplink shared channel (PUSCH) within a PUCCH group; multiplexing uplink control information (UCI) with a CG UCI based on the determination; and transmitting, by the UE to the wireless system, the multiplexed UCI with the CG UCI.