HARQ Codebook Construction for Overlapping SPS PDSCH Configurations
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Solution Overview
Problem
Current specifications for 5G New Radio systems do not adequately address issues related to semi-persistent scheduling (SPS) in the presence of overlapping SPS PDSCH configurations, dynamic grant PDSCHs, and varying priorities, leading to inefficiencies in HARQ codebook construction and feedback handling.
Innovation Solution
The proposed solution involves a robust mapping scheme for HARQ codebook construction that prioritizes high and low priority SPS PDSCH configurations, mitigates the effects of missed dynamic grant PDSCH configurations, and extends to Type 1 and Type 2 HARQ codebooks, ensuring effective handling of collisions and prioritization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple SPS PDSCH configurations are scheduled in overlapping time-frequency resources, then resource utilization efficiency is improved, but HARQ codebook construction complexity increases and reliability deteriorates due to ambiguous feedback handling
Solution Approach 1:
The patent segments the HARQ codebook construction process by introducing a prioritization mechanism that divides SPS PDSCH configurations into different priority levels. This segmentation allows the system to handle overlapping configurations systematically by processing higher priority configurations first, thereby resolving feedback ambiguity while maintaining high resource utilization.
Solution Approach 2:
The patent changes the parameter of configuration indexing by introducing a priority-based index assignment mechanism. Instead of using simple sequential indexing, the system assigns indices based on priority levels and timing relationships, which resolves the ambiguity in HARQ feedback handling for overlapping configurations while enabling efficient resource utilization.
2Loss of information
If a single PDCCH activates multiple SPS PDSCH receptions, then control signaling overhead is reduced, but the complexity of HARQ codebook construction increases due to multiple overlapping configurations
Solution Approach 1:
The patent applies preliminary action by pre-establishing priority rules and index assignment mechanisms before HARQ codebook construction is needed. The gNB pre-configures priority levels and index mappings for multiple SPS PDSCH configurations, allowing the UE to systematically construct the codebook without complex real-time decision-making, thus reducing construction complexity while maintaining low control overhead.
Solution Approach 2:
The patent introduces a priority-based index assignment mechanism as an intermediary between the PDCCH activation and HARQ codebook construction. This intermediary layer provides a systematic mapping from multiple overlapping configurations to ordered feedback positions, reducing the complexity of codebook construction while maintaining efficient control signaling.
3Adaptability or versatility
If SPS PDSCH configurations with different priorities are supported, then service differentiation capability is improved, but the complexity of handling overlapping configurations increases
Solution Approach 1:
The patent applies local quality by assigning different priority levels and index assignment rules to different SPS PDSCH configurations based on their service requirements. High-priority configurations (e.g., URLLC) receive preferential treatment in index assignment and feedback handling, while low-priority configurations (e.g., eMBB) follow standard procedures. This localized differentiation enables service differentiation while maintaining manageable complexity through clear priority-based rules.
Data Source
AI summary
Systems, methods, and circuitries are provided for configuring HARQ feedback for semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) communication. In one example, a method includes identifying a physical uplink control channel (PUCCH) resource in a first slot for communicating a hybrid automatic repeat request (HARQ) codebook. The method includes determining a set of SPS PDSCH receptions for which feedback is multiplexed in the HARQ codebook based on SPS PDSCH configurations for each component carrier and each slot, a UE capability for number of SPS PDSCH receptions per slot, and a prioritization protocol. The method includes selecting a codebook type based on whether a PDSCH is scheduled by way of a dynamic grant for any of the plurality of slots, constructing the HARQ codebook based on the set of SPS PDSCH receptions and the selected codebook type, and transmitting the HARQ codebook to a next generation node.