NR Uplink Prioritization Using Cancellation Indications
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Solution Overview
Problem
Existing 5G New Radio (NR) wireless systems face challenges in efficiently multiplexing and prioritizing uplink transmissions for different use cases such as ultra-reliable low latency communications (URLLC) and enhanced massive mobile broadband (eMBB), particularly in managing overlapping transmissions with varying priority levels and latency requirements.
Innovation Solution
A wireless transmit/receive unit (WTRU) receives configuration information for cancellation indications, allowing it to cancel or preempt lower priority uplink transmissions based on priority levels and resource allocations, enabling efficient multiplexing and prioritization of high-priority transmissions on physical uplink control channels (PUCCH) and shared channels (PUSCH).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink transmissions for different use cases (URLLC and eMBB) are multiplexed in the same wireless system, then resource utilization efficiency is improved, but transmission reliability and latency performance deteriorate due to resource conflicts and interference between different priority transmissions
Solution Approach 1:
The patent segments uplink transmissions by priority levels, dividing the transmission resource space into high-priority (URLLC) and low-priority (eMBB) segments. The network device monitors PUCCH resources and identifies high-priority transmissions, then applies cancellation indications to preempt low-priority transmissions in the same time-frequency resources, resolving resource conflicts while maintaining high resource utilization
Solution Approach 2:
The patent implements preliminary monitoring and identification of high-priority PUCCH transmissions before they cause interference. The network device proactively detects high-priority transmissions and issues cancellation indications to low-priority transmitting devices in advance, preventing resource conflicts before they occur and ensuring reliable URLLC transmission
2Measurement precision
If cancellation indication monitoring is implemented for all PUCCH resources, then transmission prioritization accuracy is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies local quality by focusing cancellation indication monitoring only on specific high-priority PUCCH resources rather than all PUCCH resources. The network device identifies resources carrying high-priority transmissions (such as URLLC control information) and applies prioritization mechanisms selectively to these local resources, achieving accurate transmission prioritization while reducing overall device complexity and processing overhead
Data Source
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AI summary
A wireless transmit/receive unit (WTRU) may receive a first higher layer configuration for a cancellation indication (CI). Further, the first higher layer configuration may include a set of reference frequency resources. Also, the WTRU may receive a grant indicating a frequency allocation and a time allocation for a scheduled transmission. Further, on a condition that the CI is received, the WTRU may interrupt the scheduled transmission. Additionally, the CI may indicate a subset of frequency resources of the set of reference frequency resources for each of a set of time symbols. Also, the WTRU may cancel the scheduled transmission on a condition that the subset of frequency resources of a set of time symbols overlaps with the frequency allocation and the time allocation for the scheduled transmission. In a further example, the first higher layer configuration may include an applicable maximum priority and the grant may include a priority index.