Two-Part HARQ-ACK Payload Compression for Wireless Feedback
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Solution Overview
Problem
Wireless communication systems face inefficiencies in HARQ-ACK feedback, particularly in reducing the number of bits allocated for HARQ-ACK feedback in the physical uplink control channel (PUCCH), which can lead to increased resource usage and overhead.
Innovation Solution
The implementation of a two-part HARQ-ACK payload system, where a first HARQ-ACK part is used to indicate successful decoding, and a second part is sent only when necessary, allowing for lossless compression and reducing the overall HARQ-ACK transmission size by encoding each part separately and transmitting them to the network node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single HARQ-ACK payload is transmitted for all downlink transmissions, then the feedback mechanism is simple to implement, but the number of bits required for transmission increases, leading to increased resource usage and overhead
Solution Approach 1:
The HARQ-ACK payload is divided into two separate parts: a first part containing HARQ-ACK information for first downlink transmissions, and a second part containing HARQ-ACK information for second downlink transmissions. These parts are transmitted separately in different time slots or frequency resources, reducing the total bits required in any single transmission and optimizing resource usage.
2Quantity of substance
If the HARQ-ACK payload is compressed by sending only necessary feedback, then the bandwidth usage is reduced, but the complexity of determining what to send increases
Solution Approach 1:
Downlink transmissions are segmented into different groups (first downlink transmissions and second downlink transmissions), each with their own HARQ-ACK feedback part. This segmentation simplifies the compression logic by providing clear rules for when to send each part, reducing the complexity of determining what feedback to send while still achieving bandwidth optimization.
Solution Approach 2:
The system dynamically determines whether to transmit the first HARQ-ACK part, the second HARQ-ACK part, or both, based on the decoding results of different downlink transmissions. This dynamic approach allows the system to send only the necessary feedback information, optimizing bandwidth usage while maintaining manageable complexity through predefined transmission conditions.
Data Source
AI summary
A method for wireless communication by a user equipment (UE) includes receiving, from a network node, a group of downlink transmissions. The method also includes forming a first hybrid automatic repeat request (HARQ)-acknowledgement (ACK) part and a second HARQ-ACK part associated with a HARQ-ACK payload in accordance with a transformation scheme. The HARQ-ACK payload may include HARQ feedback for each one of the group of downlink transmissions. A size of the second HARQ-ACK part may be 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, to the network node, the encoded first HARQ-ACK part and the encoded second HARQ-ACK part.