Sequence-Based HARQ-ACK Feedback for Wireless Signaling Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in HARQ-ACK feedback mechanisms, particularly in reducing signaling overhead and improving reliability for successful downlink shared channel transmissions, especially in ultra-reliable low latency communications.
Innovation Solution
Implementing a method where user equipment (UE) receives multiple downlink shared channel transmissions and transmits a sequence indicating only ACK bits for successful receptions, reducing the need for individual ACK bit transmissions and utilizing a shorter sequence via an uplink control channel, thereby minimizing signaling overhead and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual ACK bits are transmitted for each downlink shared channel transmission, then reliability of HARQ-ACK feedback is improved, but signaling overhead increases
Solution Approach 1:
The patent combines multiple individual ACK bits into a single sequence-based feedback signal. Instead of transmitting separate ACK bits for each downlink shared channel transmission, the UE generates a single sequence that represents the HARQ-ACK feedback for multiple transmissions, thereby reducing signaling overhead while maintaining feedback reliability.
Solution Approach 2:
The sequence-based feedback mechanism serves multiple functions simultaneously: it provides HARQ-ACK feedback for multiple downlink shared channel transmissions, reduces uplink payload size, and minimizes interference on the uplink control channel. This multi-functional approach resolves the contradiction by achieving reliable feedback with reduced signaling overhead.
2Loss of information
If multiple ACK bits are transmitted for successful receptions, then completeness of feedback information is improved, but uplink payload size increases
Solution Approach 1:
The patent merges multiple ACK bits representing successful receptions into a single sequence signal. The sequence is designed to encode feedback information for multiple downlink shared channel transmissions, ensuring that the completeness of feedback information is maintained while the uplink payload size is significantly reduced.
Solution Approach 2:
The patent changes the parameter representation of HARQ-ACK feedback from multiple discrete ACK bits to a single sequence signal. This parameter transformation allows the same amount of feedback information to be conveyed with a smaller uplink payload, resolving the contradiction between information completeness and payload size.
3Measurement precision
If individual ACK bits are transmitted for each transmission, then accuracy of acknowledgment is improved, but interference on uplink control channel increases
Solution Approach 1:
The patent combines multiple individual ACK bit transmissions into a single sequence-based feedback transmission. This merging reduces the number of uplink control channel resources occupied, thereby minimizing interference on the uplink control channel while maintaining the accuracy of acknowledgment through the sequence design that preserves feedback information integrity.
4Quantity of substance
If sequence-based feedback is used instead of individual ACK bits, then signaling overhead is reduced, but complexity of feedback processing increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the sequence structure and mapping rules at both the transmitter and receiver sides. The sequence generation, transmission, and detection processes are designed in advance with standardized procedures, which reduces the actual processing complexity during operation despite the innovative sequence-based approach.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, a plurality of downlink shared channel transmissions. The UE may transmit, to the base station, a sequence indicating that a hybrid automatic repeat request acknowledgement (ACK) feedback associated with the plurality of downlink shared channel transmissions includes only ACK bits for the plurality of downlink shared channel transmissions. Numerous other aspects are provided.