HARQ Feedback Coordination for Multi-TB IoT NTN Scheduling
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Solution Overview
Problem
In IoT NTN systems, there is no existing solution for indicating whether HARQ feedback is needed in scenarios where multiple transport blocks (TBs) are scheduled based on downlink control information (DCI), leading to potential mutual impact and inefficiency in HARQ processes.
Innovation Solution
A method and apparatus for determining and indicating HARQ feedback configurations for multiple TBs by using initial HARQ feedback configurations and control information to ensure consistency or divergence based on indication information, allowing both processes to require feedback or none, thereby eliminating mutual impact and optimizing system throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple TBs are scheduled based on DCI in IoT NTN system, then scheduling efficiency is improved, but HARQ feedback configuration management becomes complex and causes mutual impact between processes
Solution Approach 1:
The patent merges the HARQ feedback configuration management of multiple TBs by introducing a unified indication mechanism in DCI. The network device sends unified indication information that simultaneously controls the HARQ feedback configurations of multiple TBs scheduled by the same DCI, transforming complex individual process management into a unified control approach.
Solution Approach 2:
The patent changes the control parameter from individual TB-level HARQ feedback configuration to a unified indication parameter in DCI. By modifying the DCI to include indication information that applies to multiple TBs simultaneously, the system transitions from managing multiple independent configuration parameters to controlling them through a single parameter set.
2Reliability
If HARQ feedback is required for all TBs, then transmission reliability is improved, but system throughput decreases due to increased feedback overhead
Solution Approach 1:
The patent introduces dynamic HARQ feedback configuration where the requirement for feedback is not fixed but can be adjusted based on current transmission conditions. The network device dynamically decides whether to require HARQ feedback for each TB or group of TBs by setting the indication information in DCI, allowing the system to adapt between reliability-oriented and throughput-oriented modes.
Solution Approach 2:
The patent changes the HARQ feedback configuration parameter dynamically through DCI indication. By modifying the indication information in DCI, the system can switch between different feedback requirements (feedback needed, feedback not needed) for multiple TBs, enabling flexible adjustment of the balance between reliability and throughput based on channel conditions and traffic requirements.
Data Source
AI summary
Communication methods, apparatuses, and systems are described. In an example communication method, a first initial hybrid automatic repeat request (HARQ) feedback configuration corresponding to a first HARQ process and a second initial HARQ feedback configuration corresponding to a second HARQ process are obtained. First control information is received, where the first control information includes first indication information corresponding to a first transport block and a second transport block. The first indication information indicates whether to toggle the first initial HARQ feedback configuration and/or the second initial HARQ feedback configuration. It is determined, based on the first indication information, that both the first HARQ process and the second HARQ process need HARQ feedbacks, or that neither the first HARQ process nor the second HARQ process needs a HARQ feedback.