Total Downlink Assignment Index for Dynamic Codebook Determination
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Solution Overview
Problem
The existing communication technologies lack an effective mechanism for determining a feedback codebook in new-generation wireless communication systems, particularly in scenarios with Carrier Aggregation (CA) between Component Carriers (CCs) with different subcarrier spacings and dynamic codebook requirements.
Innovation Solution
A method and apparatus for generating and transmitting total downlink assignment indexes for component carrier groups, which are used to determine the size of the feedback codebook, allowing for dynamic codebook determination and reducing unnecessary feedback overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic codebook determination is implemented in NR system with Carrier Aggregation between CCs with different subcarrier spacings, then feedback flexibility is improved, but codebook size becomes dynamic and determination mechanism is complex
Solution Approach 1:
The patent divides the component carriers into groups based on their subcarrier spacing characteristics. Each group is assigned a separate counter DAI field in the DCI, allowing independent tracking and determination of codebook size for each group. This segmentation simplifies the overall determination mechanism by breaking down the complex task into manageable parts.
Solution Approach 2:
The patent introduces the Total DAI field as an intermediary parameter that combines information from multiple counter DAI fields. The Total DAI provides a unified indicator for the terminal to determine the overall codebook size, mediating between the individual group-level DAI values and the system-level codebook configuration.
2Productivity
If CBG feedback mode is adopted, then retransmission efficiency is improved by reducing retransmitted data size, but codebook determination becomes more complex
Solution Approach 1:
The patent segments the transmission block into code block groups (CBGs) for feedback purposes. Each CBG can be independently acknowledged or negatively acknowledged, allowing the terminal to provide granular feedback. The counter DAI mechanism tracks the number of CBGs that need feedback, enabling efficient codebook size determination while maintaining the benefits of CBG-based retransmission.
3Quantity of substance
If multiple counter DAI fields are multiplexed in one DCI, then downlink control information overhead is reduced, but parsing complexity increases
Solution Approach 1:
The patent segments the DCI structure into distinct fields, with each counter DAI field corresponding to a specific component carrier group. This clear segmentation allows the terminal to parse the DCI systematically by processing each group's DAI fields in sequence, reducing parsing complexity despite the presence of multiple DAI fields.
Solution Approach 2:
The patent specifies a predetermined mapping relationship between the counter DAI fields and the component carrier groups before the terminal needs to parse the DCI. This preliminary configuration allows the terminal to quickly identify and process each DAI field without complex real-time analysis, reducing parsing overhead.
Data Source
AI summary
Provided are a data transmission method and apparatus, and a data reception method and apparatus. The data transmission method comprises steps of: generating at least one total downlink assignment index for a plurality of component carrier groups; and carrying the at least one total downlink assignment index in downlink control information to transmit the same to a receiving end.