HARQ-ACK Codebook Selection for Multi-Service NR Feedback
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Solution Overview
Problem
In the NR system, configuring different HARQ-ACK codebook types for various services like URLLC and eMBB is challenging due to issues with PDCCH decoding errors affecting HARQ-ACK feedback type determination.
Innovation Solution
A wireless communication method and device that determine feedback information priority, codebook type, DAI group, data priority, and data processing capability based on DCI parameters, enabling efficient uplink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different HARQ-ACK codebook types are configured for different services (URLLC and eMBB), then service-specific feedback optimization is improved, but PDCCH decoding errors affect HARQ-ACK feedback type determination
Solution Approach 1:
The patent segments the HARQ-ACK feedback mechanism by introducing separate codebook types (first codebook for URLLC, second codebook for eMBB) and separate determination methods. Each service type has its own feedback determination path, isolating the impact of PDCCH decoding errors to specific service streams rather than affecting all feedback determinations uniformly.
Solution Approach 2:
The patent introduces an intermediary mechanism (the network device's indication through DCI format and RNTI) that mediates between the PDCCH decoding status and the HARQ-ACK feedback type selection. This intermediary allows the terminal to determine the feedback type based on predefined rules associated with different RNTIs, reducing direct vulnerability to PDCCH decoding errors.
2Measurement precision
If HARQ-ACK feedback type is determined based on PDCCH decoding status, then feedback accuracy is improved, but PDCCH decoding errors cause incorrect feedback type selection
Solution Approach 1:
The patent applies beforehand cushioning by pre-configuring multiple HARQ-ACK codebook types and pre-establishing determination rules associated with different RNTIs. When PDCCH decoding errors occur, the terminal can fall back to predetermined rules (e.g., if first DCI is not received, use second codebook), cushioning against the impact of decoding errors on feedback reliability.
Solution Approach 2:
The patent changes the determination parameter from purely PDCCH decoding status to a composite parameter including DCI format type and RNTI type. This parameter transformation provides redundancy, allowing the terminal to determine feedback type through alternative parameters when primary PDCCH decoding fails, thus maintaining measurement precision while improving reliability.
3Adaptability or versatility
If multiple HARQ-ACK codebook types are supported, then service differentiation capability is improved, but system complexity increases
Solution Approach 1:
The patent achieves universality by designing a unified feedback mechanism that handles multiple service types through a single framework. The same PUCCH resources and basic feedback procedures are used for both URLLC and eMBB services, with differentiation achieved through codebook type selection rather than separate mechanism designs, thereby supporting service differentiation while controlling system complexity.
Solution Approach 2:
The patent introduces dynamics by allowing the HARQ-ACK codebook type to be dynamically selected based on service requirements and PDCCH reception status. The system can switch between first codebook (URLLC-oriented) and second codebook (eMBB-oriented) depending on the received DCI format and RNTI type, providing adaptability without requiring complex static configuration for each service scenario.
Data Source
AI summary
A wireless communication method, a terminal device, and a network device are provided. The method includes the following. A terminal device receives first downlink control information (DCI). The terminal device determines at least one physical layer parameter according to the first DCI, where the at least one physical layer parameter includes at least one of a feedback information priority, a feedback codebook type, a feedback type, a downlink assignment indicator (DAI) packet, a data priority, a content of DAI field, or a data processing capability. The terminal device transmits data or control information according to at least one of the feedback information priority, the feedback codebook type, the feedback type, the DAI group, the data priority, the content of DAI field, or the data processing capability.