NCR HARQ-ACK Codebook Segmentation for Reliable Downlink Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing HARQ-ACK feedback for network-controlled repeaters, particularly in scenarios where dynamic HARQ-ACK codebooks are beneficial for improved coverage and interference management.
Innovation Solution
Configuring network-controlled repeaters with three HARQ-ACK groups to construct a dynamic HARQ-ACK codebook, where each group corresponds to specific types of transmissions (PDCCH, PDSCH, and radio link/beam quality), allowing for efficient HARQ-ACK feedback and forwarding of downlink channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single HARQ-ACK codebook is used for all downlink transmissions, then the system structure is simple, but the feedback efficiency and reliability are insufficient for network-controlled repeaters
Solution Approach 1:
The patent divides the HARQ-ACK feedback into three separate groups (Group 1 for PDCCH, Group 2 for PDSCH, Group 3 for radio link/beam quality) that are concatenated to form a complete codebook. This segmentation allows each group to handle specific transmission types independently, improving feedback reliability while maintaining manageable complexity through structured organization.
2Area of stationary object
If dynamic HARQ-ACK codebooks are implemented for improved coverage, then the coverage and interference management are improved, but the system complexity and overhead increase
Solution Approach 1:
By segmenting the codebook into three functional groups with specific roles (control channel feedback, data channel feedback, and link quality feedback), the patent enables dynamic codebook implementation that improves coverage while controlling complexity through clear functional separation and standardized group structures.
Solution Approach 2:
The patent organizes HARQ-ACK feedback along a new dimensional structure by introducing group identifiers and specific bit position allocations for each group. This dimensional organization allows the system to handle complex dynamic codebooks in a structured manner, improving coverage capability while managing configuration complexity through systematic arrangement.
3Measurement precision
If multiple HARQ-ACK groups are configured for different transmission types, then the feedback precision and reliability are improved, but the processing overhead and latency increase
Solution Approach 1:
The segmentation into three dedicated groups allows each group to be processed and constructed independently with specific bit allocation rules, improving feedback precision for each transmission type while enabling parallel processing that reduces overall latency compared to a monolithic codebook approach.
Solution Approach 2:
The patent establishes predetermined rules for constructing each HARQ-ACK group, including bit allocation, group ordering, and concatenation sequences. These preliminary configurations enable efficient processing by eliminating the need for complex real-time decisions, thereby reducing latency while maintaining high precision through structured feedback.
Data Source
AI summary
Methods and apparatus are provided for configuring a dynamic hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook for a network-controlled repeater (NCR). A first HARQ-ACK group is configured for physical downlink control channel (PDCCH) transmissions from a base station to the NCR. The PDCCH transmissions include first side control information. A second HARQ-ACK group is configured for scheduled physical downlink shared channel (PDSCH) transmissions from the base station to the NCR. The scheduled PDSCH transmissions include second side control information. A third HARQ-ACK group is configured for downlink (DL) channels or signals from the base station for the NCR to forward to a user equipment (UE). The dynamic HARQ-ACK codebook includes a combination of the first HARQ-ACK group, the second HARQ-ACK group, and the third HARQ-ACK group.