Adaptive HARQ Feedback for Buffer Management
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Solution Overview
Problem
In wireless communication systems, longer HARQ processing times lead to increased concurrent HARQ processes between base stations and user equipment, resulting in higher memory resource usage and buffer management challenges.
Innovation Solution
Implementing adaptive HARQ feedback mechanisms, including full and reset NACKs, to manage HARQ buffers efficiently, where user equipment transmits NACKs indicating whether decoding values are stored or discarded, and base stations adjust redundancy versions based on these feedbacks, supporting multiple HARQ threads with reduced buffer requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple concurrent HARQ processes are implemented to improve communication reliability, then the number of concurrent HARQ processes increases, but the memory resource consumption and buffer management complexity increase
Solution Approach 1:
The patent segments HARQ processes into two distinct types: full HARQ processes that maintain decoding values for soft combining, and light HARQ processes that discard decoding values. This segmentation allows the system to support multiple concurrent HARQ processes while reducing overall memory consumption by not retaining all decoding values simultaneously across all processes.
Solution Approach 2:
The patent introduces dynamic HARQ process management where the base station can flexibly allocate resources between full and light HARQ processes based on channel conditions and traffic patterns. This dynamic approach optimizes the balance between communication reliability and memory resource consumption in real-time.
2Reliability
If multiple concurrent HARQ processes are implemented to improve communication reliability, then the number of concurrent HARQ processes increases, but the buffer management complexity increases
Solution Approach 1:
By segmenting HARQ processes into full and light types with distinct buffer management rules, the patent simplifies the overall buffer management complexity. Light HARQ processes use minimal buffering (only acknowledgment status), while full processes use comprehensive buffering, making the management strategy more straightforward and scalable.
Solution Approach 2:
The patent applies different buffer management qualities to different HARQ processes based on their specific needs. Full HARQ processes maintain comprehensive decoding values for soft combining when needed, while light HARQ processes use simplified buffering. This localized differentiation reduces overall system complexity compared to uniform approaches.
3Reliability
If full NACK feedback is transmitted to maintain decoding values for soft combining, then communication reliability improves, but memory resource consumption increases
Solution Approach 1:
Instead of always maintaining full decoding values (excessive action), the patent applies partial action by maintaining decoding values only for full HARQ processes where soft combining is beneficial, while discarding them for light HARQ processes. This selective approach optimizes the balance between reliability improvement and memory consumption.
Solution Approach 2:
The patent implements a strategy where decoding values are discarded for light HARQ processes after use, and only recovered/maintained for full HARQ processes when needed. This selective discarding and recovering mechanism reduces overall memory resource consumption while preserving reliability where necessary.
Data Source
AI summary
The present disclosure discloses apparatuses, systems, and methods of wireless communication that use an adaptive hybrid automatic repeat request (HARQ) procedure and a multi-threaded HARQ procedure for improving HARQ buffer utilization and management. A user equipment (UE) can transmit a reset NACK to reduce the amount of HARQ buffers needed for concurrent HARQ processes. A base station can transmit different redundancy data in a HARQ retransmission depending on the types of NACK the UE transmitted. The base station can communicate with the UE using multiple light HARQ processes or threads that use less HARQ buffers than a typical HARQ procedure. Other aspects, features, and embodiments are also claimed and described.