Intra-UE Multiplexing for Overlapping PUCCH and PUSCH Transmissions
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, there is a need to efficiently manage overlapping uplink control channel and shared channel messages to prevent collisions and ensure reliable data transmission, as existing methods often result in inefficient communication due to dropped transmissions and retransmissions.
Innovation Solution
A method and apparatus for user equipment (UE) to resolve overlaps between uplink control channels and shared channels by prioritizing transmissions, either by multiplexing or dropping lower priority messages, allowing simultaneous or multiplexed transmission of uplink control and shared channel messages based on priority levels and capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits both uplink control channel messages and uplink shared channel messages simultaneously on different component carriers, then communication throughput is improved, but transmission reliability deteriorates due to potential collisions and overlaps
Solution Approach 1:
The patent segments the collision resolution process into distinct priority levels. First, overlaps between same-priority channels are resolved, then overlaps between different-priority channels are resolved. This segmentation allows systematic handling of multiple overlapping transmissions without compromising reliability while maintaining throughput.
Solution Approach 2:
The patent changes the parameter of transmission priority by introducing priority levels for different channel types. By assigning different priorities to control channels and shared channels, the system can dynamically adjust which transmission takes precedence during overlaps, thereby maintaining reliability while allowing high-throughput simultaneous transmissions when priorities permit.
2Reliability
If the UE prioritizes and drops lower priority transmissions during overlaps, then transmission reliability is improved, but communication efficiency deteriorates due to dropped transmissions and retransmissions
Solution Approach 1:
The patent introduces priority level parameters to differentiate between control channels and shared channels. By changing the priority parameter, the system determines which transmission to maintain and which to drop during overlaps. This parameter-based approach improves reliability for critical control information while minimizing efficiency loss by only dropping lower-priority transmissions when necessary.
3Reliability
If the UE resolves overlaps between same priority channels first, then different priority channels, then transmission reliability is improved, but processing complexity increases
Solution Approach 1:
The patent segments the complex overlap resolution problem into two simpler sub-problems: first resolving same-priority overlaps, then resolving different-priority overlaps. This segmentation reduces processing complexity by breaking down the decision-making process into manageable stages, while still achieving reliable transmission through systematic priority-based resolution.
Solution Approach 2:
The patent performs preliminary resolution of same-priority overlaps before addressing different-priority overlaps. This preliminary action simplifies the subsequent resolution process by reducing the number of overlapping transmissions that need to be considered in the second stage, thereby managing complexity while ensuring reliability.
4Reliability
If the UE performs intra-UE multiplexing of overlapping transmissions, then transmission reliability is improved, but device complexity increases due to multiplexing operations
Solution Approach 1:
The patent merges overlapping uplink control channel and uplink shared channel transmissions into a single multiplexed transmission when priorities allow. This merging improves reliability by ensuring that at least one transmission succeeds, while the complexity is managed by only performing multiplexing operations when necessary based on priority comparisons.
Data Source
AI summary
A UE receives control signaling that indicates that the UE is scheduled to transmit one or more uplink control channel messages on a first component carrier that overlap in a time domain with one or more uplink shared channel messages scheduled for transmission on a second component carrier. The UE resolves a first overlap of uplink control channels having a same priority level, if present, and resolves, after resolving the first overlap, a second overlap of an uplink control channel and at least one uplink shared channel having the same priority level, if present. The UE resolves two or more channels having a different priority level after resolving the first overlap and the second overlap. The UE transmits one or more uplink transmissions including at least one of the one or more uplink control channel messages and the one or more uplink shared channel messages.