HARQ Codebook Multiplexing for SPS PUCCH Collision Handling
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Solution Overview
Problem
Existing wireless communication systems face challenges in handling collisions between semi-persistently scheduled (SPS) physical uplink control channels and downlink symbols, leading to conflicts in prioritizing hybrid automatic repeat request (HARQ) codebooks with different physical layer priorities, which affects transmission efficiency.
Innovation Solution
The method involves deferring the transmission of HARQ codebooks until a target PUCCH to avoid collisions, multiplexing codebooks with different priorities, sequencing them based on initial SPS PUCCH timing, and applying joint coding to ensure high-priority handling, thereby generating a combined HARQ codebook with prioritized transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SPS PUCCH transmission is scheduled at a specific time, then the HARQ codebook can be transmitted on time, but it may collide with downlink symbols causing transmission conflicts
Solution Approach 1:
The system performs preliminary identification of potential collisions between SPS PUCCH transmissions and downlink symbols. When a collision is detected, the transmission is proactively deferred to a later time slot, preventing the harmful collision before it occurs while maintaining transmission reliability.
Solution Approach 2:
The PUCCH transmission timing is made dynamic rather than fixed. The system adjusts the transmission time slot based on real-time detection of downlink symbol patterns, allowing the transmission to move to alternative time slots when collisions are anticipated, thus avoiding conflicts while ensuring reliable delivery.
2Productivity
If multiple HARQ codebooks with different priorities are multiplexed together, then transmission resources are utilized efficiently, but the sequencing and prioritization becomes complex
Solution Approach 1:
The system applies different quality levels (priorities) to different portions of the multiplexed codebook based on their importance. High-priority codebooks are assigned specific positions and handling rules that differ from low-priority codebooks, allowing efficient resource utilization while managing complexity through differentiated treatment of critical versus non-critical data.
Solution Approach 2:
The multiplexed HARQ codebook is segmented into distinct priority groups (high priority and low priority). Each segment is handled separately with specific sequencing rules, allowing the system to maintain efficient resource utilization while reducing overall complexity by breaking down the complex multiplexing problem into manageable priority-based segments.
3Reliability
If high-priority HARQ codebooks are handled first, then transmission reliability is improved, but transmission time increases due to sequencing operations
Solution Approach 1:
The system performs preliminary identification and marking of high-priority codebooks before the actual multiplexing process. By pre-identifying which codebooks require priority handling, the system minimizes the time required for sequencing operations while ensuring that high-priority transmissions are reliably delivered first.
Solution Approach 2:
The system implements expedited processing for high-priority codebooks by skipping unnecessary sequencing steps for low-priority items. High-priority codebooks are rapidly identified and positioned in the multiplexed structure without waiting for complete analysis of all codebooks, thus maintaining reliability while reducing overall processing time.
Data Source
AI summary
A method of wireless communication by a user equipment (UE) includes deferring transmission of a first hybrid automatic repeat request (HARQ) codebook until a target PUCCH, due to potential collision of a first initial semi-persistently scheduled (SPS) physical uplink control channel (PUCCH) with a first downlink symbol. The first HARQ codebook has a physical layer (L1) high priority. The method also includes scheduling transmission of a second HARQ codebook at the target PUCCH, the second HARQ codebook having a physical layer (L1) low priority. The method further includes multiplexing the first HARQ codebook and the second HARQ codebook to generate a combined HARQ codebook for transmission in the target PUCCH.