User Terminal HARQ-ACK Codebook Mapping for Flexible Feedback
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Solution Overview
Problem
In next-generation radio communication systems, the user terminal struggles to flexibly control the feedback of Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) for multiple downlink shared channels, which leads to unsatisfied request conditions for different services.
Innovation Solution
A user terminal that receives information indicating the type of codebook corresponding to each service, and maps the delivery confirmation information for each downlink shared channel to the appropriate codebook for flexible HARQ-ACK feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single codebook is used for HARQ-ACK feedback across multiple services, then the system structure remains simple, but the feedback cannot be flexibly controlled to meet different service requirements
Solution Approach 1:
The patent segments the unified HARQ-ACK feedback mechanism into service-specific codebooks. Each service (e.g., eMBB, URLLC) is assigned a separate codebook that can be independently configured and controlled, allowing flexible adaptation to different service requirements while maintaining manageable complexity through modular organization
Solution Approach 2:
The patent introduces dynamic codebook configuration where the codebook type (first type or second type) can be selectively applied to different services based on their specific requirements. This dynamic assignment enables the system to adapt feedback mechanisms to varying service conditions such as latency requirements and reliability needs
2Reliability
If service-specific codebooks are implemented for each downlink shared channel, then different service requirements can be satisfied, but the complexity of managing multiple codebooks increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring codebook types for different services before actual data transmission. The network device预先 indicates which codebook type (first or second) should be used for each service, allowing the user equipment to prepare appropriate feedback mechanisms in advance, ensuring reliable service requirement satisfaction while reducing real-time decision complexity
Solution Approach 2:
The patent implements local quality by applying different codebook configurations to different services based on their specific characteristics. Each service receives a tailored codebook type that matches its local requirements (e.g., URLLC gets one configuration, eMBB gets another), ensuring optimal performance for each service while managing overall system complexity
Data Source
AI summary
A user terminal includes a receiving section that receives information indicating a type of a codebook corresponding to each service, and a transmitting section that maps, to the codebook, delivery confirmation information for a downlink shared channel associated with each service and that transmits the codebook. Thus, feedback of an HARQ-ACK can be flexibly controlled.