Grouping HARQ Processes for URLLC Feedback Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in providing reliable HARQ-ACK feedback, especially for URLLC services, due to limitations in Type-3 HARQ-ACK codebook configurations and SPS release mechanisms.
Innovation Solution
The proposed solution involves enhancing the wireless communication system to support SPS release together with Type-3 HARQ-ACK codebook configuration, and implementing a flexible procedure for controlling HARQ-ACK codebooks by grouping HARQ processes to improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Type-3 HARQ-ACK codebook configuration is used, then feedback efficiency is improved, but reliability for URLLC services deteriorates
Solution Approach 1:
The patent divides HARQ processes into multiple groups (first HARQ process group and second HARQ process group) with different feedback mechanisms. Type-3 HARQ-ACK codebook is applied to one group while Type-1 or Type-2 is applied to another, allowing segmented optimization where reliability-critical services use more reliable feedback types while maintaining overall system efficiency.
2Productivity
If SPS release mechanism is implemented, then resource utilization is improved, but feedback reliability deteriorates
Solution Approach 1:
The patent applies different feedback reliability characteristics to different HARQ process groups based on their specific requirements. SPS-release-related HARQ processes are assigned to a specific group with appropriate feedback type (Type-1 or Type-2 for higher reliability), while other processes can use more efficient Type-3 feedback, achieving local optimization of both resource utilization and reliability.
3Reliability
If HARQ processes are grouped into multiple HPGs, then feedback reliability is improved, but system complexity increases
Solution Approach 1:
The patent segments HARQ processes into a limited number of groups (typically two groups) with clear differentiation in feedback requirements. This segmentation approach achieves reliability improvement through diverse feedback mechanisms while controlling complexity by avoiding excessive grouping, maintaining manageable system architecture.
Data Source
AI summary
A user equipment (UE) is disclosed. The UE comprises a processor configured to perform operations comprising receiving a hybrid automatic repeat request process group (HPG) configuration signal from a base station associated therewith, wherein the HPG configuration signal comprises information of a plurality HARQ process groups (HPGs), each HPG comprising one or more HARQ processes of a set of HARQ processes configured for the UE. The operations further comprise receiving a downlink control information (DCI) from the base station, wherein the DCI comprises information that identifies one or more HPGs of the plurality of HPGs, the HARQ-ACK feedback information of which are to be included in a HARQ-ACK feedback signal that is triggered by the DCI. In addition, the operations comprise generating the HARQ-ACK feedback signal comprising the HARQ-ACK feedback information of HARQ processes associated with the one or more HPGs and sending the HARQ-ACK feedback signal to the base station.