HARQ Codebook Construction for Multiplexing Super-ACK Feedback
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently constructing HARQ codebooks that can multiplex super-ACK and HARQ feedback, particularly in scenarios where different types of feedback messages have varying bit quantities, leading to inefficiencies in resource utilization and retransmission strategies.
Innovation Solution
The proposed solution involves constructing HARQ codebooks that combine super-ACK and HARQ feedback messages by generating filler bits or sub-codebooks, allowing for the concatenation of different types of feedback into a single codebook, which can be transmitted over shared channels, enabling dynamic configuration and improved retransmission decisions based on additional channel information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ feedback and super-ACK feedback are multiplexed into a single codebook, then feedback transmission efficiency is improved, but codebook construction complexity increases due to varying bit quantities
Solution Approach 1:
The patent divides the feedback codebook into multiple sub-codebooks, with each sub-codebook containing feedback messages of a specific type (HARQ feedback or super-ACK feedback). This segmentation allows the system to handle different feedback types with different bit quantities separately, reducing the complexity of constructing a unified codebook while still enabling efficient multiplexing through the concatenated sub-codebooks.
Solution Approach 2:
The patent employs dynamic codebook construction where the size and structure of the codebook are adjusted based on the actual feedback messages generated. Instead of using a fixed-size codebook, the system dynamically determines the codebook structure by concatenating sub-codebooks corresponding to different feedback types, thereby adapting to varying bit quantities and reducing construction complexity.
2Reliability
If super-ACK feedback with additional channel information is transmitted, then retransmission reliability is improved, but communication overhead increases
Solution Approach 1:
The patent combines multiple types of feedback messages (HARQ feedback and super-ACK feedback) into a single multiplexed codebook structure. This merging approach allows the system to transmit additional channel information through super-ACK feedback without requiring separate transmission channels, thereby improving retransmission reliability while controlling communication overhead through efficient resource utilization.
Solution Approach 2:
The patent implements dynamic codebook construction where the feedback message structure adapts to the actual transmission conditions. The codebook size and composition are dynamically adjusted based on the number and type of feedback messages, allowing the system to include additional channel information only when necessary, thus improving reliability without proportionally increasing communication overhead.
3Adaptability or versatility
If dynamic codebook construction is used to accommodate varying feedback types, then adaptability is improved, but processing time increases
Solution Approach 1:
By segmenting the codebook into distinct sub-codebooks for different feedback types, the patent enables efficient processing. Each sub-codebook can be constructed independently and then concatenated, which simplifies the overall processing compared to constructing a single unified codebook. This segmentation approach maintains high adaptability to different feedback types while reducing the time required for codebook construction through parallel processing of sub-codebooks.
Solution Approach 2:
The patent employs preliminary configuration where the codebook structure is pre-defined with templates for different feedback types. This preliminary setup allows the system to quickly construct the actual codebook by only filling in the necessary portions based on the current feedback messages, thereby maintaining high adaptability while significantly reducing processing time compared to constructing a completely new codebook structure from scratch.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described to support codebook construction for enhanced hybrid automatic repeat request (HARQ) feedback. A user equipment (UE) may be configured to support a first type of HARQ feedback and a second type of HARQ feedback that includes additional information relative to the first type. A base station may transmit multiple downlink transmissions to the UE, where a first set of the downlink transmissions may be associated with the first type of HARQ feedback and a second set of the downlink transmissions may be associated with the second type of HARQ feedback. The UE may attempt to decode the downlink transmissions and may generate respective feedback for the downlink transmissions. The UE may construct a single HARQ codebook to multiplex the different types of HARQ feedback for the downlink transmissions and may transmit the HARQ codebook to the base station.