Intra-UE Uplink Prioritization via Physical Layer Preemption
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Solution Overview
Problem
Existing wireless communication systems face challenges in identifying and managing priority levels for transmissions at the physical layer, particularly in scenarios where intra-UE collisions occur on the Physical Downlink Shared Channel (PDSCH).
Innovation Solution
The proposed solution involves methods and apparatuses for intra-UE prioritization during transmission, which include identifying priority levels at the physical layer, handling intra-UE PDSCH collisions, supporting multiple HARQ ACK codebooks, enabling UCI on the Physical Uplink Shared Channel (PUSCH) for multiple priorities, and enabling MAC layer handling of intra-UE conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If priority identification is implemented at the physical layer to enable preemption of transmissions, then transmission reliability for high-priority applications is improved, but device complexity increases due to additional physical layer processing and multiple HARQ codebook management
Solution Approach 1:
The patent segments the HARQ acknowledgment feedback into multiple priority-based codebooks (e.g., first codebook for high-priority URLLC, second codebook for low-priority eMBB). This segmentation allows independent handling and prioritization of different traffic types, enabling reliable high-priority transmissions while managing physical layer complexity through structured organization
Solution Approach 2:
The patent introduces an intermediary prioritization mechanism at the physical layer that mediates between conflicting transmission priorities. The physical layer uses priority indicators and multiple codebooks to resolve conflicts before MAC layer processing, enabling preemption without requiring complete MAC layer intervention for every collision scenario
2Adaptability or versatility
If multiple HARQ ACK codebooks are supported for different priorities, then adaptability to different application requirements is improved, but loss of information increases due to potential collisions and preemptions of lower priority transmissions
Solution Approach 1:
The patent applies preliminary action by having the UE prepare multiple priority-based HARQ codebooks in advance, with each codebook structured for specific priority levels. When a high-priority transmission arrives, the system can immediately preempt lower-priority transmissions that have already been partially processed, ensuring high-priority data is not lost while the pre-prepared codebook structure enables rapid response
Solution Approach 2:
The patent changes the parameter of HARQ codebook organization from a single unified structure to multiple priority-differentiated structures. Each codebook is configured with specific parameters (e.g., codebook size, timing) optimized for its priority level, allowing the system to adapt to different application requirements while managing information loss through priority-based protection
3Productivity
If intra-UE prioritization is implemented at the physical layer to handle collisions, then productivity is improved by enabling low-latency communications, but device complexity increases due to additional collision detection and resolution procedures
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously detect and resolve intra-UE collisions at the physical layer using priority indicators and pre-configured multiple codebooks. The UE independently determines which transmission to preempt based on priority levels without requiring external network intervention for each collision event, improving productivity through rapid autonomous resolution while managing complexity through self-contained procedures
Data Source
AI summary
Methods and apparatuses are described herein for Intra-UE Prioritization in uplink (UL) transmissions. In an example, an apparatus may receive first information indicating a first uplink grant associated with a first transmission and second information indicating a second uplink grant associated with a second transmission. The apparatus may determine, based on the first information and the second information, that the first transmission and the second transmission overlap at least partially in time. The apparatus may determine a first priority associated with the first transmission and a second priority associated with the second transmission. The apparatus may then cause, based at least in part on the first priority and the second priority, at least one of: prioritization of one transmission over another transmission, or preemption of the first transmission by the second transmission.