Lossy Compression for HARQ-ACK Feedback in Wireless Networks
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Solution Overview
Problem
Wireless communication systems face inefficiencies in resource allocation for hybrid automatic repeat request (HARQ) acknowledgment (ACK) feedback, particularly in reducing the number of bits required for HARQ-ACK feedback in the physical uplink control channel (PUCCH), where lossless compression provides some relief but further reduction is needed to optimize network capacity.
Innovation Solution
The implementation of lossy compression techniques for HARQ-ACK feedback, specifically through bundling and partitioning schemes, where the user equipment (UE) encodes HARQ-ACK bits into fewer partitions, ensuring no NACK-to-ACK errors occur, thereby reducing the overhead in HARQ-ACK feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lossless compression is used for HARQ-ACK feedback, then the number of bits required for feedback is reduced, but further reduction is needed to optimize network capacity
Solution Approach 1:
The HARQ-ACK feedback bits are divided into multiple partitions or groups, where each partition can be independently compressed or quantized. This segmentation allows the system to apply different compression strategies to different parts of the feedback, achieving better overall bit reduction while maintaining essential information for network capacity optimization.
2Quantity of substance
If lossy compression techniques are used to reduce HARQ-ACK feedback bits, then overhead is reduced, but distortion is introduced
Solution Approach 1:
The system changes the parameters of the HARQ-ACK feedback by applying quantization to transform continuous or high-precision feedback information into discrete levels. This parameter transformation reduces the number of bits required for feedback while controlling the distortion through carefully selected quantization levels, thereby reducing overhead without excessive information loss.
3Loss of energy
If the number of HARQ-ACK bits is reduced through compression, then resource usage is minimized, but reliability may be affected
Solution Approach 1:
The compression and quantization schemes are designed with feedback mechanisms that allow the system to monitor the quality and reliability of the compressed HARQ-ACK feedback. Based on this feedback, the system can adjust the compression level or retransmit critical information, ensuring that resource usage is minimized while maintaining acceptable communication reliability.
Data Source
AI summary
A method of wireless communication by a user equipment (UE) includes receiving, from a network device, a number of transmissions. The method also includes generating an original hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook based on whether each of the number of transmission is successfully decoded. The method further includes converting a block of k HARQ-ACK bits from the original HARQ-ACK codebook into a partition. A number of partitions for a number of blocks corresponds to quantized HARQ-ACK bits. The method still further includes transmitting the quantized HARQ-ACK bits to the network device.