Deferred Status Bit for HARQ Feedback in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, existing technologies face challenges in efficiently managing hybrid automatic repeat request (HARQ) feedback, particularly in determining whether all downlink transmissions have been successfully decoded by user equipment (UE), leading to potential misinterpretation and inefficient retransmissions.
Innovation Solution
A method and system where a status bit is transmitted to the base station indicating whether all downlink transmissions have been successfully decoded, allowing for selective retransmissions based on this feedback, utilizing a semi-persistent scheduling (SPS) configuration and allowing for the deferral of acknowledgement data until available uplink slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual acknowledgement data is transmitted for each downlink transmission, then the base station can identify which specific transmissions failed, but the feedback overhead and complexity increase
Solution Approach 1:
The patent combines multiple individual acknowledgement data bits into a single status bit that represents the overall decoding status of multiple downlink transmissions. This merging approach reduces feedback overhead and simplifies processing while still enabling the base station to determine whether retransmissions are needed, resolving the contradiction between precise identification and system complexity
Solution Approach 2:
The patent extracts only the essential information needed for retransmission decisions (whether any transmission failed) from the complete set of individual acknowledgement data. By taking out only the critical status information rather than transmitting all individual acknowledgement bits, the system reduces feedback complexity while maintaining sufficient precision for error correction
2Reliability
If the UE transmits detailed acknowledgement data for each downlink transmission, then retransmission accuracy improves, but uplink resource consumption increases
Solution Approach 1:
The patent extracts only the essential retransmission decision information from complete individual acknowledgements, transmitting only what is necessary (the status bit) rather than all detailed acknowledgement data. This extraction reduces uplink energy consumption while preserving the reliability needed for accurate retransmission decisions
Solution Approach 2:
The patent applies partial action by transmitting only the minimal necessary feedback information (status bit) rather than complete individual acknowledgements for all downlink transmissions. This partial feedback approach consumes less uplink energy while providing sufficient information for the base station to maintain reliable retransmission accuracy
3Adaptability or versatility
If the UE defers acknowledgement data transmission to later uplink slots, then resource allocation flexibility improves, but feedback delay increases
Solution Approach 1:
The patent merges multiple acknowledgement data elements into a single status bit that can be transmitted in deferred uplink slots. This consolidation allows flexible resource allocation across different uplink opportunities while the aggregated status information maintains timely feedback effectiveness, balancing adaptability with time loss
Data Source
AI summary
Aspects relate to providing a status bit to a base station, where the status bit indicates whether all of multiple downlink transmissions have been successfully decoded. In an aspect, a user equipment (UE) receives a plurality of downlink transmissions from a base station, and generates a plurality of acknowledgement data respectively for the plurality of downlink transmissions, each of the plurality of acknowledgement data indicating whether a respective downlink transmission of the plurality of downlink transmissions has been successfully decoded. The UE further transmits, to the base station, at least one status bit based on the plurality of acknowledgement data, the at least one status bit indicating whether all of the plurality of downlink transmissions have been successfully decoded.