Multiplexing High and Low Priority UCI on PUSCH
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently multiplexing high priority and low priority uplink control information (UCI) on a physical uplink shared channel (PUSCH), leading to increased latency for lower priority transmissions.
Innovation Solution
The proposed solution involves scheduling a user equipment (UE) to transmit multiple messages at the same or overlapping time on a radio frequency spectrum band, allowing for the multiplexing of high priority and low priority UCI transmissions on a PUSCH. This is achieved by determining the resources for high and low priority UCI messages based on their payload sizes, with smaller payloads puncturing the channel and larger payloads being rate matched.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE drops lower priority transmissions to ensure reliable transmission of higher priority information, then the reliability of high priority UCI is improved, but the latency of low priority UCI increases
Solution Approach 1:
The patent merges high priority and low priority UCI transmissions onto the same PUSCH channel by allocating different resource sets to each priority level. This combining approach allows both transmissions to occur simultaneously without dropping either, resolving the contradiction between ensuring high priority reliability and maintaining low priority timing.
Solution Approach 2:
The patent segments the PUSCH channel into different resource sets (first resource set for high priority UCI, second resource set for low priority UCI). This segmentation enables independent handling of each priority level while utilizing the same physical channel, allowing simultaneous transmission without interference.
2Productivity
If the UE multiplexes multiple UCI transmissions on the same PUSCH channel, then the spectral efficiency is improved, but the resource allocation complexity increases
Solution Approach 1:
The patent applies local quality by assigning different resource allocation rules to different priority levels. High priority UCI uses a first resource set with specific allocation characteristics, while low priority UCI uses a second resource set with different characteristics. This localized differentiation simplifies the overall allocation process by providing clear, priority-specific rules rather than requiring complex global optimization.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may determine that a high priority uplink control information (UCI) message, a low priority UCI message, and an uplink shared channel message overlap. The UE may select a first set of resources on the physical uplink shared channel for the high priority UCI message then select a second set of resources on the physical uplink shared channel for the low priority UCI message. The second set of resources may be non-overlapping with the first set of resources. The UE may transmit the high priority UCI message on the first set of resources, the low priority UCI message on the second set of resources, and the uplink shared channel message on a third set of resources on the physical uplink shared channel.