Uplink Control Channel Multiplexing for Priority Overlap
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining multiplexing behavior and power headroom reporting when physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) resources of different priority indexes overlap in time, leading to potential reliability and latency issues with high-priority transmissions.
Innovation Solution
A system and method for determining multiplexing behavior by assessing conditions associated with overlapping resources, adjusting the size of low-priority HARQ-ACK codebooks, and enabling multiplexing of high-priority UCI with low-priority transmissions without compromising reliability or latency, while accurately reporting power headroom for simultaneous PUCCH and PUSCH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PUCCH and PUSCH resources of different priority indexes overlap in time, then spectral efficiency is improved through multiplexing, but reliability and latency of high-priority transmissions deteriorate
Solution Approach 1:
The patent segments uplink transmissions by priority indexes, creating separate handling procedures for high-priority (priority index 1) and low-priority (priority index 0) transmissions. When resources overlap, the system segments the multiplexing decision based on priority, ensuring high-priority UCI is multiplexed only under specific conditions that preserve its reliability requirements.
Solution Approach 2:
The patent changes the parameter of multiplexing behavior based on priority index. Different multiplexing rules are applied depending on the priority level: high-priority transmissions use stricter multiplexing conditions to maintain reliability, while low-priority transmissions allow more flexible multiplexing to improve spectral efficiency. This parameter change resolves the contradiction by adapting multiplexing behavior to transmission priority.
2Productivity
If multiple PUCCH and PUSCH resources of different priority indexes overlap in time, then resource utilization is improved through multiplexing, but latency of high-priority transmissions increases
Solution Approach 1:
The patent applies preliminary action by determining multiplexing behavior in advance based on priority indexes before actual transmission occurs. The system evaluates whether high-priority UCI can be multiplexed with low-priority data by checking specific conditions (such as whether low-priority PUSCH carries uplink data) before making the multiplexing decision, thereby preventing latency issues rather than resolving them after they occur.
3Productivity
If multiplexing of high-priority UCI with low-priority transmissions is enabled, then spectral efficiency is improved, but power headroom reporting accuracy deteriorates
Solution Approach 1:
The patent applies local quality by providing different power headroom reporting treatments for different priority levels. When high-priority UCI is multiplexed with low-priority PUSCH, the system calculates and reports power headroom separately for each priority level, ensuring accurate reporting for high-priority transmissions while still allowing multiplexing to improve spectral efficiency.
Data Source
AI summary
Described herein is a procedure for determining multiplexing behavior when multiple physical uplink control channel (PUCCH) and/or physical uplink shared channel (PUSCH) resources of different priority indexes overlap in time. The wireless transmit/receive unit (WTRU) determines a multiplexing indication applicable to a set of resources overlapping in time, at least one condition associated to the multiplexing indication, and multiplexes a subset of the resources based on whether the at least one condition is satisfied. Further described herein are solutions for selecting a grant on which uplink control information (UCI) is multiplexed in the case that no data is available for transmission and the grants are of multiple priority indexes. Also described herein are solutions for reporting accurate power headroom applicable to simultaneous transmission of PUCCH and PUSCH when the PUCCH and PUSCH may be of different priority indexes.