HARQ Bitmap Feedback for NTN Delay and Overhead Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional HARQ technologies in NTN scenarios suffer from high communication delay and increased buffer pressure due to large communication delays and inefficient resource utilization, leading to low communication throughput rates.
Innovation Solution
A method for HARQ bitmap information feedback that involves a terminal determining HARQ feedback based on indication information from an access network device, generating a semi-static or dynamic codebook to reduce feedback resource overheads and improve communication efficiency by selectively providing HARQ feedback for specific downlink transmission units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional HARQ technology is used with fixed number of processes in NTN, then system compatibility is maintained, but communication throughput rate decreases due to large delay
Solution Approach 1:
The patent applies dynamics by making the HARQ process number configurable rather than fixed. The network device can dynamically adjust the number of HARQ processes based on NTN specific requirements, allowing the system to adapt to large communication delays while maintaining compatibility with existing HARQ mechanisms through the same basic feedback structure.
2Reliability
If all HARQ processes are used for retransmission in NTN, then retransmission capability is ensured, but communication delay and buffer pressure increase
Solution Approach 1:
The patent changes the parameter of HARQ process number from a fixed value to a configurable value that can be optimized for NTN scenarios. By adjusting this parameter, the system can reduce the number of concurrent HARQ processes, thereby reducing buffer pressure and communication delay while maintaining sufficient retransmission capability through the remaining processes.
3Reliability
If HARQ feedback is provided for all downlink transmission units, then decoding reliability is improved, but feedback resource overhead increases
Solution Approach 1:
The patent applies partial action by providing HARQ feedback selectively for only those downlink transmission units that require it, rather than for all transmission units. This reduces feedback resource overhead while maintaining decoding reliability for the critical transmissions that need acknowledgment.
4Reliability
If HARQ bitmap size covers all transmission units, then complete feedback coverage is achieved, but feedback message length increases
Solution Approach 1:
The patent extracts only the necessary HARQ feedback bits corresponding to transmission units that require feedback, removing unnecessary bits from the HARQ bitmap. This reduces the feedback message length while maintaining complete coverage for all transmission units that actually need acknowledgment.
Data Source
AI summary
Embodiments of this disclosure provide a hybrid automatic repeat request (HARQ) bitmap information feedback method and a related device. The method includes: A terminal receives indication information from an access network device, where the indication information is used to determine whether HARQ feedback is needed for a transmit block transmitted in a plurality of downlink transmission units. The terminal determines HARQ bitmap information based on the indication information, where the HARQ bitmap information includes HARQ feedback information of at least one target transmission unit, and the target transmission unit indicates a downlink transmission unit that needs HARQ feedback in the plurality of downlink transmission units. The terminal sends the HARQ bitmap information to the access network device. Some embodiments of the present disclosure can reduce feedback resource overheads in an NTN scenario, reduce a communication delay, and improve a communication throughput rate.