Soft HARQ Buffering for High-Rate Wireless Error Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As data transmission rates increase, traditional error-correction techniques like ARQ and HARQ require larger buffers and more power to manage higher data volumes, becoming impractical for mobile devices, especially in unlicensed spectrum scenarios with higher transmission failure rates.
Innovation Solution
The implementation of soft hybrid automatic repeat request (HARQ) techniques, which involve storing only a portion of the signal in a buffer after a decoding failure, allowing for incremental combining of signals and reducing the buffer size and power consumption by using incremental chase combining (ICC) and log-likelihood ratio (LLR) buffers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional error-correction techniques (ARQ/HARQ) are used to improve reliability, then packet delivery reliability is improved, but buffer size and power consumption increase
Solution Approach 1:
The patent segments the buffer storage requirement by storing only a portion of the retransmitted data rather than the entire data packet. This segmentation allows the system to maintain reliability through incremental redundancy while reducing the buffer size and associated power consumption proportional to the reduced storage requirements.
Solution Approach 2:
The patent applies partial action by storing only the necessary portion of retransmitted data (partial redundancy) rather than complete duplicates. This partial storage approach provides sufficient error correction capability while avoiding the excessive buffer requirements of traditional HARQ, thereby reducing power consumption.
2Reliability
If traditional error-correction techniques (ARQ/HARQ) are used to improve reliability, then packet delivery reliability is improved, but buffer physical dimensions increase
Solution Approach 1:
The patent segments the buffer storage requirement by storing only a portion of the retransmitted data rather than the entire data packet. This segmentation allows the system to maintain reliability through incremental redundancy while reducing the buffer size and associated power consumption proportional to the reduced storage requirements.
Solution Approach 2:
The patent applies partial action by storing only the necessary portion of retransmitted data (partial redundancy) rather than complete duplicates. This partial storage approach provides sufficient error correction capability while avoiding the excessive buffer requirements of traditional HARQ, thereby reducing power consumption.
3Reliability
If soft combining of signals is performed to improve decoding success, then error correction capability is improved, but the combined signal size exceeds buffer capacity
Solution Approach 1:
The patent extracts and stores only the essential portion of the combined signal that contains the critical redundancy information needed for error correction. By taking out only the necessary components rather than storing the entire combined signal, the system maintains error correction capability while fitting within buffer capacity constraints.
Solution Approach 2:
The patent applies partial action by storing only the necessary portion of retransmitted data (partial redundancy) rather than complete duplicates. This partial storage approach provides sufficient error correction capability while avoiding the excessive buffer requirements of traditional HARQ, thereby reducing power consumption.
Data Source
AI summary
Methods, systems, and devices for soft hybrid automatic repeat request operation in wireless communication are described. A user equipment (UE) may fail to decode a received signal, for example. The UE may store a portion of the signal in a buffer if the signal size is greater than the buffer size; otherwise, the UE may store the entire signal in the buffer. The UE may then receive a second signal and combine the second signal with the stored portion of the first signal; the combined signal may be larger than the buffer size. This combined signal may, for example, have a code rate less than the first signal. The UE may perform a second decoding attempt on the combined signal. The UE may determine that the second decoding attempt failed and may store a portion of the combined signal in the buffer.