Communication Apparatus Flexible Code Block Group Retransmission
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Solution Overview
Problem
In Next-Generation Radio Access Technologies like NR, there is a need for more flexible control over CB group re-transmission to improve transmission efficiency across various use cases.
Innovation Solution
A communication apparatus and method that allows for flexible design by notifying and re-transmitting specific one-encoding units within a predetermined transmission unit, enabling targeted re-transmission based on reception results, thereby enhancing system-wide transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CB group re-transmission is performed to improve transmission efficiency, then system-wide transmission efficiency is improved, but flexibility in controlling re-transmission operations is reduced
Solution Approach 1:
The patent segments the transmission block into multiple code block groups (CBGs) and enables independent re-transmission control for each CBG. The control section divides the transmission block into plurality of code block groups, and the communication section re-transmits only the failed CBGs based on NACK feedback, rather than re-transmitting the entire block. This segmentation provides flexibility in controlling re-transmission operations while maintaining high transmission efficiency.
Solution Approach 2:
The patent implements dynamic control of re-transmission operations by allowing the control section to selectively determine which CBGs require re-transmission based on reception results. The system dynamically adjusts re-transmission behavior by comparing ACK/NACK feedback for each CBG and re-transmitting only the necessary portions, providing adaptable control across different use cases and channel conditions.
2Reliability
If all one-encoding units in a transmission unit are re-transmitted to ensure reliability, then reception reliability is improved, but resource utilization is reduced
Solution Approach 1:
The patent extracts and re-transmits only the failed code block groups (CBGs) rather than re-transmitting the entire transmission block. The control section identifies which CBGs received NACK feedback and re-transmits only those specific CBGs, extracting the minimum necessary data for reliable reception. This approach maintains reception reliability while significantly improving resource utilization by avoiding unnecessary re-transmission of successfully received CBGs.
Solution Approach 2:
The patent applies different re-transmission treatment to different CBGs based on their individual reception status. Each CBG is evaluated independently, and re-transmission is applied locally only to the failed CBGs rather than uniformly to the entire transmission block. This localized approach ensures reliability for failed transmissions while conserving resources for successful transmissions.
3Loss of energy
If selective re-transmission of specific CBGs is implemented to improve resource utilization, then resource utilization is improved, but system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the receiving apparatus sends ACK/NACK information for each CBG to the transmitting apparatus. The control section uses this feedback to determine which CBGs require re-transmission. This feedback-driven approach enables selective re-transmission of only the failed CBGs, improving resource utilization while managing system complexity through automated decision-making based on reception results.
Solution Approach 2:
The system performs self-service by automatically identifying and re-transmitting only the failed CBGs based on feedback information. The control section autonomously determines which CBGs need re-transmission without requiring complex external control, and the communication section automatically re-transmits the identified CBGs. This self-service mechanism reduces the need for complex manual control while achieving efficient resource utilization.
Data Source
AI summary
[Subject]To make flexible design according to a use case possible and further improve the transmission efficiency of the entire system.[Solving Means]A communication apparatus includes a communication section configured to perform wireless communication, and a control section configured to control such that information corresponding to a plurality of one-encoding units to be made a target of re-transmission is notified to another apparatus, the target of re-transmission being, from among one or a plurality of one-encoding units defined so as to include at least part of a plurality of one-encoding units included in a predetermined transmission unit, any of the plurality of one-encoding units whose reception results in failure and all of the plurality of one-encoding units included in the predetermined transmission unit.