5G Terminal Feedback Mode Selection for Overhead Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G systems, the existing Code Block (CB)-based retransmission method for transport blocks (TB) requires inefficient feedback mechanisms, leading to increased feedback overhead and suboptimal utilization of transmission resources, as terminal devices need to acknowledge or negate multiple CBs, which does not dynamically adjust feedback modes based on reception conditions.
Innovation Solution
A method where a terminal device determines or is configured with a target feedback mode based on the reception situation of a transport block, using feedback modes such as bitmap, ACK/NACK of 1 bit, or ACK/NACK of multiple bits, to optimize feedback overhead and resource utilization by adjusting feedback information transmission according to the number or proportion of successfully received code blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal device uses a bitmap feedback mode to acknowledge multiple code blocks, then the feedback information becomes more precise and retransmission efficiency improves, but the feedback overhead increases
Solution Approach 1:
The patent applies dynamics by enabling the terminal device to dynamically select between different feedback modes (bitmap mode and 1-bit ACK/NACK mode) based on the reception situation of transport blocks. The selection criterion is the number of successfully received code blocks: when the number exceeds a threshold, bitmap mode is used for precise feedback; when the threshold is not met, 1-bit mode is used to reduce overhead. This dynamic adaptation resolves the contradiction between feedback precision and overhead.
2Quantity of substance
If the terminal device uses 1-bit ACK/NACK feedback mode, then the feedback overhead is reduced, but the retransmission efficiency decreases due to unnecessary retransmissions
Solution Approach 1:
The patent resolves this contradiction through dynamic feedback mode selection. When the terminal device successfully receives a sufficient number of code blocks (exceeding the threshold), it switches to bitmap feedback mode to provide precise acknowledgment information. This ensures that retransmission efficiency is maintained by avoiding unnecessary retransmissions of correctly received code blocks, while still allowing overhead reduction to be achieved when using 1-bit mode in appropriate scenarios.
3Productivity
If the system dynamically adjusts feedback modes based on reception conditions, then both feedback overhead and resource utilization are optimized, but the system complexity increases
Solution Approach 1:
The patent implements dynamic feedback mode adjustment based on reception conditions, where the terminal device evaluates the number of successfully received code blocks against a threshold to determine the appropriate feedback mode. This dynamic approach optimizes resource utilization by matching feedback precision to actual reception quality.
Solution Approach 2:
The patent changes the feedback mode parameter based on the reception situation parameter. When the number of successfully received code blocks changes relative to the threshold, the system transitions between feedback modes (bitmap or 1-bit ACK/NACK), thereby optimizing resource utilization while managing complexity through parameter-based adaptation.
4Measurement precision
If the terminal device provides detailed feedback for each code block, then the network device can accurately identify failed transmissions, but the feedback information volume increases
Solution Approach 1:
The patent applies dynamics by making the feedback detail level adaptive rather than fixed. When reception conditions are good (number of successfully received code blocks exceeds threshold), the system uses bitmap mode to provide detailed feedback for accurate identification of failed transmissions. When reception conditions are poor, the system switches to 1-bit ACK/NACK mode to reduce feedback information volume, accepting lower precision in exchange for reduced overhead.
Data Source
AI summary
A method for transmitting feedback information, a terminal device, and a network device are provided. The method includes: a terminal device determines a target feedback mode used for transmitting feedback information, wherein the feedback information is feedback information for a transport block (TB) sent by a network device and received by the terminal device; and the terminal device uses the target feedback mode to transmit the feedback information.