5G eMBB Reliability via CBG Preemption Indication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The current 5G mobile communications system faces challenges in maintaining the reliability of Enhanced Mobile Broadband (eMBB) services due to resource preemption by Ultra-Reliable and Low-Latency Communications (URLLC) services, leading to decreased reliability and efficiency in eMBB data transmission.
Innovation Solution
A data transmission method that involves a terminal device receiving indication information from a network device to identify affected code block groups (CBGs) and resource elements, allowing for accurate elimination of unnecessary signals, thereby improving the reliability of preempted eMBB services by distinguishing between used and unused time-frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the access network device allocates time-frequency resources to URLLC service in a preemption manner, then the latency requirement of URLLC service is met, but the reliability of eMBB service transmission decreases
Solution Approach 1:
The patent segments the transport block into multiple code block groups (CBGs) and provides individual indication information for each CBG that was preempted. This allows the terminal to selectively discard only the affected CBGs while maintaining other CBGs, thereby resolving the contradiction by enabling URLLC preemption while preserving eMBB reliability through granular error handling.
Solution Approach 2:
The access network device sends indication information to the terminal device to feedback which specific CBGs were preempted by URLLC transmission. This feedback mechanism enables the terminal to identify and discard only the affected data portions, allowing URLLC to preempt resources while maintaining eMBB reliability for non-preempted portions.
2Productivity
If the access network device uses data that is not the data of the eMBB user for subsequent demodulation decoding, then the resource allocation efficiency is improved, but the demodulation decoding accuracy decreases
Solution Approach 1:
The patent extracts and identifies the specific CBGs that were preempted by URLLC transmission through indication information. The terminal then removes (discards) only these identified CBGs from the transport block before demodulation decoding, preventing the use of corrupted data while maintaining efficient resource allocation for the remaining valid CBGs.
3Reliability
If the access network device sends indication information to indicate affected code block groups, then the reliability of eMBB service is improved, but the device complexity increases
Solution Approach 1:
The patent uses segmentation of the transport block into CBGs as the basis for indication information. Each CBG can be individually identified and marked for discarding, which simplifies the indication mechanism compared to indicating individual code blocks or entire transport blocks, thereby improving reliability while controlling device complexity through this hierarchical structure.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
This application provides a data transmission method, a terminal device, and a network device. The method includes: receiving, by a terminal device, first control information sent by a network device, where the first control information is used to instruct the terminal device to receive, on a first time-frequency resource, a first transport block sent by the network device at an nth time; receiving, by the terminal device, the first transport block on the first time-frequency resource; and receiving, by the terminal device, first indication information sent by the network device, where the first indication information is used to indicate a first code block group CBG in the first transport block, and the first CBG corresponds to a second time-frequency resource during nth transmission of the first transport block, where n is an integer greater than or equal to 0. In the embodiments of this application, reliability of transmission of a service whose resource is preempted can be improved.