NR Uplink Multiplexing With Priority-Based Cancellation
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Solution Overview
Problem
Existing 5G New Radio (NR) wireless systems face challenges in efficiently multiplexing and prioritizing uplink transmissions, particularly for ultra-reliable low latency (URLLC) and enhanced massive mobile broadband (eMBB) services, due to overlapping frequency resources and varying priority levels.
Innovation Solution
Implementing a wireless transmit/receive unit (WTRU) that receives higher layer configurations for cancellation indications, grants with priority indices, and frequency allocations, allowing for the interruption or cancellation of scheduled transmissions based on priority levels and resource overlaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink transmissions are multiplexed with overlapping frequency resources for URLLC and eMBB services, then resource utilization efficiency is improved, but transmission reliability and latency performance deteriorate due to priority conflicts
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different uplink transmissions based on their service requirements. URLLC transmissions are assigned higher priority while eMBB transmissions receive lower priority. This allows the system to treat different portions of the uplink spectrum and time resources differently, ensuring that high-priority URLLC transmissions are protected from interruption by lower-priority eMBB transmissions, thereby maintaining transmission reliability while still achieving efficient resource utilization through multiplexing.
2Reliability
If cancellation indications are implemented to interrupt scheduled transmissions, then high-priority transmission reliability is improved, but system complexity increases due to additional signaling and monitoring requirements
Solution Approach 1:
The patent segments the uplink transmission scheduling into multiple priority levels, with distinct cancellation indication mechanisms for different priority transmissions. The system divides cancellation indications into specific types (e.g., first type for interrupting scheduled transmissions, second type for preventing new transmissions) that can be independently managed. This segmentation allows the system to implement reliable high-priority transmission protection through targeted cancellation mechanisms while avoiding the need for complete system-wide complexity increases.
Solution Approach 2:
The patent introduces cancellation indications as intermediary signaling elements that mediate between the scheduler and the transmitting devices. These cancellation indications act as intermediaries that carry priority information and interruption commands without requiring direct complex interactions between all system components. The intermediary nature of these signals simplifies the overall system architecture by providing a standardized mechanism for priority-based transmission management.
3Measurement precision
If priority indices are assigned to grants to enable transmission prioritization, then transmission prioritization accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent implements partial prioritization by assigning priority indices selectively to specific grants rather than universally to all transmissions. The system applies priority differentiation only where needed (e.g., for URLLC versus eMBB services) while using default priority levels for other transmissions. This partial application of priority indexing achieves sufficient transmission prioritization accuracy for critical services while minimizing the signaling overhead that would result from comprehensive priority assignment across all transmissions.
Data Source
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.