HARQ-ACK Codebook Compression for Mixed BLER Targets
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Solution Overview
Problem
Current wireless communication systems, particularly those employing 5G NR technology, face challenges in efficiently compressing Hybrid Automatic Repeat Request (HARQ) acknowledgement (HARQ-ACK) feedback, especially when dealing with HARQ-ACK codebooks designed for different Block Error Rate (BLER) targets.
Innovation Solution
The proposed solution involves a method where user equipment (UE) transmits two-part HARQ-ACK feedback based on compression data sets for different HARQ-ACK codebooks, or a combination thereof, allowing for separate or joint compression of codebooks with varying BLER targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK codebooks are designed for different BLER targets, then reliability requirements are met, but compression efficiency deteriorates
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple sub-codebooks, each associated with a specific BLER target. This allows different codebook portions to be compressed independently according to their respective BLER requirements, resolving the contradiction between meeting different reliability targets and achieving compression efficiency.
Solution Approach 2:
The patent applies different compression rates and compression data sets to different sub-codebooks based on their specific BLER targets. Each sub-codebook receives tailored compression treatment optimized for its reliability requirements, rather than applying a uniform compression approach across the entire codebook.
2Length of moving object
If compression rate is increased, then payload length is reduced, but compression accuracy deteriorates
Solution Approach 1:
The patent dynamically selects compression rates and compression data sets based on the specific BLER target and codebook characteristics. The compression parameters are adjusted adaptively for each sub-codebook, allowing optimization between payload length reduction and compression accuracy for different reliability requirements.
Solution Approach 2:
The patent changes compression parameters (compression rate, compression data set selection) according to the BLER target of each codebook. By varying these parameters across different sub-codebooks, the system achieves both payload length reduction and maintained accuracy for each specific reliability requirement.
Data Source
AI summary
Lossless compression for HARQ-ACK codebooks with different BLER is described. An apparatus is configured to receive downlink transmission(s) from a network node. The apparatus is configured to transmit two-part HARQ-ACK feedback for the downlink transmission(s) based on: a first compression data set for a first HARQ-ACK codebook and a second compression data set for a second HARQ-ACK codebook, and/or a third compression data set based on a combination of the first and second HARQ-ACK codebooks. Another apparatus is configured to configure a UE with a first configuration for a first compression data set, a second compression data set, or a third compression data set, or a second configuration for a first rate, a second rate, or a third rate. The apparatus is configured to receive two-part HARQ-ACK feedback for a downlink transmission(s) based on the first and second compression data sets or the third compression data set.