Segment-Based HARQ Codebook for Wireless Feedback Efficiency
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in HARQ-ACK feedback reporting due to inflexible and resource-intensive bundling mechanisms, particularly in segment-based resource allocation.
Innovation Solution
The implementation of a segment-based hybrid automatic-repeat/request (HARQ) codebook allows for efficient feedback reporting by associating each bit in the ACK/NACK codebook with a segment of resources, enabling flexible bundling and reduced error rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional HARQ-ACK bundling mechanisms are used, then feedback reporting is simplified, but resource utilization efficiency deteriorates and signaling overhead increases
Solution Approach 1:
The feedback codebook is segmented into multiple parts, where each part corresponds to a specific time domain resource segment. This segmentation allows the UE to report HARQ-ACK feedback for different segments separately, improving resource utilization efficiency while maintaining manageable feedback reporting complexity through structured organization.
2Quantity of substance
If multiple messages are bundled into one ACK/NACK bit, then feedback overhead is reduced, but ACK to NACK error rate increases
Solution Approach 1:
By segmenting the feedback codebook into multiple parts corresponding to different time domain segments, the patent reduces the number of messages bundled into each ACK/NACK bit. This segmentation maintains lower feedback overhead while improving reliability by reducing bundling errors, as each segment contains fewer messages that need to be acknowledged.
3Productivity
If segment-based HARQ codebook is implemented, then resource utilization improves and feedback efficiency increases, but system complexity increases
Solution Approach 1:
The network entity configures the UE with segment-based HARQ codebook parameters in advance through RRC signaling, including the number of segments and their corresponding time domain resources. This preliminary configuration simplifies the actual codebook generation process during operation, as the UE can directly map received messages to predefined segments without complex real-time calculations.
4Ease of manufacture
If fixed segment structure is used, then implementation is simpler, but adaptability to different scheduling scenarios deteriorates
Solution Approach 1:
The patent implements a dynamic segment structure where the number of segments and their time domain configurations can be adjusted based on scheduling scenarios. The network entity can configure different numbers of segments (e.g., 2, 4, or more) and adjust segment boundaries through RRC signaling, allowing the system to adapt to varying message rates and scheduling requirements while maintaining a relatively simple implementation through predefined configuration options.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A segment based feedback codebook may lead to more efficient and responsive codebook generation for hybrid automatic-repeat/request (HARQ) acknowledgment reporting. A segment-based feedback codebook may support codebook generation where each bit in an acknowledgment/negative-acknowledgment (ACK/NACK) codebook may correspond to a segment of resources. A network entity may schedule a user equipment with one or more messages within one or more segments. The UE may generate one ACK/NACK bit for each segment, and a HARQ codebook transmitted in a physical uplink control channel reporting occasion may include the ACK/NACK bits corresponding to the messages in those segments. A segment may be a set of time domain resources.