HARQ-ACK Codebook Determination for SPS Collision Avoidance
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Solution Overview
Problem
In communication technologies, terminals configured with high-priority semi-persistent scheduling (SPS) for high-reliability or low-latency services face collisions during HARQ-ACK transmissions, leading to discarded high-priority HARQ-ACK transmissions and impaired transmission performance due to frequent high-priority SPS PDSCH transmissions.
Innovation Solution
A method and apparatus that determine a HARQ-ACK codebook based on HARQ-ACK feedback indication information, TDD configuration, or dynamic slot format information for M downlink SPS configurations, allowing for effective transmission of HARQ-ACK feedback even in collision-prone scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal is configured with high-priority DL SPS for transmitting high-reliability or low-latency services, then transmission reliability and latency performance are improved, but HARQ-ACK transmission collisions occur frequently, causing loss of feedback information
Solution Approach 1:
The patent segments HARQ-ACK feedback information into multiple codebooks (first HARQ-ACK codebook and second HARQ-ACK codebook) based on different SPS configurations and priority levels. This segmentation allows selective transmission of critical feedback information while avoiding collisions, thereby maintaining transmission reliability without losing feedback information.
Solution Approach 2:
The patent determines HARQ-ACK timing and codebook construction in advance based on configured SPS parameters and slot formats. By pre-planning feedback transmission timing and content, the system avoids last-minute collisions and ensures high-priority feedback is transmitted reliably before resource conflicts occur.
2Productivity
If high-priority SPS PDSCH transmissions are performed frequently, then service quality for high-reliability services is improved, but HARQ-ACK transmissions collide with slot formats, affecting transmission performance
Solution Approach 1:
The patent dynamically adjusts HARQ-ACK codebook construction and transmission timing based on slot format indications and actual SPS PDSCH reception patterns. This dynamic adaptation allows the system to maintain high service transmission efficiency while avoiding fixed timing conflicts that would degrade HARQ-ACK transmission performance.
Solution Approach 2:
The patent changes key parameters such as HARQ-ACK timing offsets, codebook sizes, and transmission resources based on the number and priority of SPS configurations. By adjusting these parameters dynamically, the system achieves both high productivity for frequent SPS transmissions and reliable HARQ-ACK feedback delivery.
3Adaptability or versatility
If multiple DL SPS configurations are configured for different services, then service diversity and adaptability are improved, but HARQ-ACK codebook determination complexity increases
Solution Approach 1:
The patent segments the HARQ-ACK codebook determination process into distinct stages: first determining codebooks for individual SPS configurations separately, then combining them according to priority rules. This segmented approach maintains service configuration flexibility while reducing the overall complexity by breaking down the deterministic process into manageable steps.
Solution Approach 2:
Instead of determining a single unified HARQ-ACK codebook directly from multiple SPS configurations, the patent inverts the approach by first determining separate codebooks for each configuration and then selecting/combining them based on priority. This inversion simplifies the determination process while supporting diverse service configurations.
Data Source
AI summary
A HARQ-ACK feedback method and apparatus are provided, so as to solve a problem that a terminal cannot perform HARQ-ACK feedback in a case that the terminal is configured with a DL SPS. The method may be applied to a terminal. The method includes determining, based on first information, a HARQ-ACK codebook corresponding to M DL SPS configurations; where the first information includes at least one of the following: first HARQ-ACK feedback indication information, first TDD configuration information, or first dynamic slot format information; and M≥1, and M is an integer.