Two-Part HARQ-ACK Payload Compression for Wireless Feedback
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in reducing the number of bits allocated for HARQ-ACK feedback, particularly in the presence of dummy NACKs, which can lead to increased network bandwidth usage and inadequate compression of HARQ-ACK payloads.
Innovation Solution
The implementation of a two-part HARQ-ACK compression scheme, where an original HARQ-ACK payload is transformed into a first and second HARQ-ACK part, with the size of the second part being a function of the first part, allowing for separate encoding and transmission, thereby reducing the overall payload size and improving compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a traditional HARQ-ACK feedback mechanism is used without compression, then the feedback is simple to implement and decode, but the payload size increases leading to increased network bandwidth usage
Solution Approach 1:
The HARQ-ACK payload is divided into two separate parts: a first part that is always transmitted and a second part that is conditionally transmitted based on the content of the first part. This segmentation allows the receiver to potentially decode the feedback without needing to process the entire original payload, thereby reducing the effective payload size while maintaining decoding simplicity.
Solution Approach 2:
The first HARQ-ACK part acts as an intermediary that provides partial feedback information. The second part supplements this information only when necessary. This intermediary approach reduces the average payload size by eliminating the need to always transmit the complete original HARQ-ACK feedback, while the receiver can use the first part as a mediator to reduce decoding complexity in cases where it contains sufficient information.
2Adaptability or versatility
If dummy NACKs are included in HARQ-ACK feedback to maintain protocol compliance, then protocol compatibility is maintained, but the payload size increases reducing compression efficiency
Solution Approach 1:
The method extracts and removes dummy NACKs from the HARQ-ACK payload before compression and transmission. By taking out these unnecessary negative acknowledgments that were originally included to maintain protocol compatibility, the payload size is reduced without sacrificing protocol compatibility, as the essential feedback information is preserved in the two-part structure.
Solution Approach 2:
The approach changes the parameter representation by transforming the traditional single HARQ-ACK payload into a two-part structure with different transmission conditions. This parameter change allows the system to maintain protocol compatibility through the structured format while simultaneously reducing the actual transmitted data volume by conditional transmission of the second part.
3Loss of information
If the entire original HARQ-ACK payload is transmitted without modification, then all feedback information is preserved, but network bandwidth usage increases
Solution Approach 1:
The feedback transmission becomes dynamic through the two-part structure where the second part is conditionally transmitted based on the content of the first part. This dynamics allows the system to adapt the transmitted payload size to the actual information needs, preserving complete feedback information when necessary while reducing bandwidth usage when the first part suffices, thereby resolving the contradiction between information completeness and bandwidth efficiency.
Data Source
AI summary
A method for wireless communication by a UE includes receiving, from a network node, a group of downlink transmissions. The method also includes forming a first HARQ-ACK part and a second HARQ-ACK part associated with an original HARQ-ACK payload in accordance with satisfying a forming condition. The original HARQ-ACK payload may include HARQ feedback for each one of the group of downlink transmissions. A size of the second HARQ-ACK part is a function of the first HARQ-ACK part. The method also includes separately encoding the first HARQ-ACK part and the second HARQ-ACK part. The method further includes transmitting the encoded first HARQ-ACK part and the encoded second HARQ-ACK part.