Uplink Grant Prioritization for PUSCH with UCI
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE and 5G NR, the current prioritization methods for uplink grants lead to issues such as increased power consumption and interference due to the de-prioritization of PUSCH with UCI, resulting in potential 'empty' PUSCH transmissions while overlapping PUSCH with data is not transmitted, breaking intra-UE prioritization.
Innovation Solution
A method for user equipment (UE) to prioritize uplink grants for PUSCH with UCI by selecting and transmitting the UL grant based on indications that increase the logical channel priority of PUSCH with UCI, ensuring its transmission even when overlapping with other grants, and considering PHY-priority to prevent skipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUSCH with UCI is de-prioritized in current uplink grant prioritization methods, then overlapping PUSCH with data can be transmitted, but PUSCH with UCI transmission is broken and intra-UE prioritization is violated
Solution Approach 1:
The patent changes the priority parameter of PUSCH with UCI from low to high by introducing a new indication field in the UL grant. This parameter change ensures that PUSCH with UCI is always selected for transmission over overlapping PUSCH without UCI, resolving the contradiction between reliable UCI transmission and overall uplink efficiency.
2Reliability
If PUSCH with UCI is prioritized for transmission, then UCI transmission reliability is improved, but power consumption increases due to additional transmissions
Solution Approach 1:
The patent applies preliminary action by configuring the UE with priority indication information in advance through RRC signaling or MAC CE. This allows the UE to pre-determine which PUSCH transmissions should be prioritized without making real-time decisions, reducing processing overhead and power consumption while ensuring reliable UCI transmission.
3Device complexity
If current prioritization methods are used, then device complexity is reduced, but intra-UE prioritization is broken and transmission correctness is compromised
Solution Approach 1:
The patent applies local quality by introducing a specific indication field in the UL grant that applies only to PUSCH with UCI. This localized modification to the grant structure allows the network to independently control the priority of UCI-carrying transmissions without changing the overall prioritization framework, maintaining simplicity while ensuring correctness.
Data Source
AI summary
Provided is a method for a user equipment (UE), comprising: obtaining one or more indications associated with uplink transmission scheduled by one or more uplink (UL) grants, the one or more UL grants including a UL grant for a physical uplink share channel (PUSCH) with uplink control information (UCI), selecting a UL grant for transmission from the one or more UL grants based at least in part upon the one or more indications, such that the UL grant for the PUSCH with UCI is prioritized for selection, and causing a PUSCH corresponding to the selected UL grant to be transmitted.