HARQ Feedback Bit Mapping for Uplink Control Channel Overhead Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In existing 3GPP LTE systems, terminals face inefficiencies in HARQ feedback due to the need to send unnecessary bits, leading to increased overhead and reduced performance, especially when the network configures a large resource range with few available resources.
Innovation Solution
The terminal determines the number of HARQ bits based on the number of scheduling resources and the expected maximum feedback ACKs, and sends HARQ information accordingly, using a method that maps scheduling resource indexes to a reduced number of bits, thereby optimizing feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal sends HARQ feedback for all scheduled resources, then the feedback completeness is improved, but the feedback overhead increases
Solution Approach 1:
The patent extracts only the necessary HARQ feedback bits corresponding to actually scheduled resources, removing unnecessary feedback bits for unscheduled resources. This is achieved by determining the number of HARQ bits based on the actual number of scheduled resources rather than the total configured resources, thereby reducing feedback overhead while maintaining completeness for scheduled resources.
Solution Approach 2:
The patent changes the parameter of feedback bit length dynamically based on the actual scheduling situation. Instead of using a fixed feedback bit length for all configured resources, the system adjusts the number of HARQ bits to match the actual number of scheduled resources, optimizing the balance between feedback completeness and overhead.
2Adaptability or versatility
If the network configures a large resource range, then the scheduling flexibility is improved, but the HARQ feedback complexity increases
Solution Approach 1:
The patent introduces dynamic adjustment of HARQ feedback parameters based on actual scheduling conditions. The number of feedback bits is dynamically determined according to the actual number of scheduled resources within the configured resource range, allowing the system to maintain high scheduling flexibility while adapting the feedback complexity to match actual needs.
Solution Approach 2:
The patent segments the feedback process into two parts: configuration phase (where a large resource range is configured for flexibility) and execution phase (where only actual scheduled resources require feedback). This segmentation allows the system to enjoy scheduling flexibility from the large configured range while avoiding the complexity of feedback for all possible resources.
Data Source
Figure 1~3
AI summary
Disclosed are a method for sending of Hybrid Automatic Repeat reQuest (HARQ) information, and a data receiving end. The method includes: a data receiving end sends HARQ information determined through detection results for received transport blocks to a data sending end according to the number of scheduling resources and the feedback number of expected maximum feedback Acknowledgements (ACK). By means of the embodiments of the present invention, the number of bits of HARQ is determined by the number of scheduling resources and the feedback number, and HARQ information is determined according to the detection results for the received transport blocks, and feedback is conducted on the determined number of bits of the HARQ, so that a data sending end determines the HARQ information is a content sent for which HARQ information. On the other hand, the overhead of the HARQ information is saved by mapping of the scheduling resource indexes.