Autonomous Uplink CBG Retransmission With Granular Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Retransmitting entire transport blocks in autonomous uplink communication is inefficient when only a small portion of code block groups (CBGs) are not properly received, leading to unnecessary data transmission and increased collision likelihood.
Innovation Solution
Implementing code block group (CBG)-level feedback, where the base station provides feedback indicating which CBGs were not properly received, allowing the user equipment (UE) to retransmit only those specific CBGs, reducing redundant data transmission and minimizing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If code block-based autonomous uplink transmission is implemented, then uplink transmission efficiency is improved, but device complexity increases due to codebook management and feedback processing
Solution Approach 1:
The codebook is segmented into multiple code blocks, each representing a specific uplink transmission scenario. This segmentation allows the system to selectively activate only the necessary code blocks based on current transmission conditions, improving efficiency while managing complexity through modular organization.
Solution Approach 2:
Code blocks are pre-configured with specific uplink transmission parameters and precoding matrix indicators during system setup. This preliminary action enables the terminal to quickly select and apply appropriate code blocks without real-time complex calculations, enhancing transmission efficiency while reducing runtime processing complexity.
2Adaptability or versatility
If multiple code blocks are configured for different uplink scenarios, then transmission adaptability is improved, but feedback processing complexity increases
Solution Approach 1:
The system dynamically selects and activates specific code blocks based on current uplink transmission conditions such as channel state, traffic type, and quality of service requirements. This dynamic adaptation allows the system to handle diverse scenarios efficiently while managing feedback processing complexity through conditional activation rather than processing all code blocks uniformly.
Solution Approach 2:
Each code block is designed to be multi-functional, capable of handling multiple uplink transmission scenarios through configurable parameters. This universality allows a single code block structure to serve multiple purposes, improving adaptability while reducing the overall number of specialized code blocks needed, thereby managing feedback processing complexity.
3Productivity
If code block-based autonomous uplink transmission is used, then resource allocation efficiency is improved, but uplink control overhead increases due to codebook indication feedback
Solution Approach 1:
The essential codebook selection information is extracted and transmitted through efficient feedback mechanisms, separating critical control information from detailed codebook contents. This extraction approach allows the system to maintain high resource allocation efficiency through accurate codebook indication while minimizing uplink control overhead by transmitting only the necessary selection indicators rather than complete codebook data.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit, via an autonomous uplink communication, one or more transport blocks to a base station. Each transport block may include a plurality of code block groups (CBGs). The base station may provide CBG-level feedback to the UE based at least in part on the autonomous uplink communication. In some examples, the base station may provide the CBG-level feedback in one or more downlink feedback information (DFI) packets. In some other examples, the base station may provide the CBG-level feedback via one or more uplink transmission grants. The UE may retransmit one or more CBGs from the autonomous uplink communication based at least in part on the DFI packets or uplink transmission grants.