Sidelink HARQ Feedback Signaling for Replacement Data
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Solution Overview
Problem
Existing HARQ processes in wireless communication systems face inefficiencies due to high retransmission rates and increased power consumption when decoding failures occur, particularly in sidelink communications, leading to network performance degradation.
Innovation Solution
A receiving device transmits a distinct 'replacement data request' signal instead of conventional ACK or NACK signals when decoding fails, prompting the transmitting device to send replacement data at a lower coding rate, enhancing the likelihood of successful decoding and reducing retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HARQ processes use ACK/NACK signals for decoding feedback, then the communication system can maintain basic error correction functionality, but the retransmission rate increases and power consumption rises when decoding failures occur
Solution Approach 1:
The patent segments the feedback signal types into three distinct categories: ACK signal for successful decoding, NACK signal for decoding failure with retransmission request, and a new third feedback signal for decoding failure with replacement data request. This segmentation allows the system to differentiate between different types of decoding failures and apply appropriate correction strategies, thereby improving overall decoding success rate while optimizing power consumption by avoiding unnecessary retransmissions.
Solution Approach 2:
The patent changes the feedback signal parameter by introducing a new third signal type that carries different semantic information than traditional ACK/NACK. This parameter change enables the transmitting device to adjust transmission parameters such as coding rate and modulation scheme based on the specific feedback received, improving decoding reliability while reducing redundant power consumption from inappropriate retransmission strategies.
2Productivity
If conventional HARQ processes use ACK/NACK signals for decoding feedback, then the communication protocol remains simple, but the number of retransmissions increases leading to network performance degradation
Solution Approach 1:
The patent segments feedback responses into three distinct types, allowing the system to identify and handle replacement data requests separately from standard retransmission requests. This segmentation enables more precise control over retransmission operations, reducing unnecessary retransmissions and improving network efficiency while minimizing time loss.
Solution Approach 2:
The patent enhances the feedback mechanism by introducing a new feedback signal that provides more granular information about decoding failure conditions. This improved feedback enables the transmitting device to make more informed decisions about whether to retransmit original data or send replacement data, thereby reducing retransmission delays and improving overall network productivity.
3Speed
If replacement data is transmitted at higher coding rates to improve throughput, then data transmission speed increases, but the likelihood of successful decoding decreases
Solution Approach 1:
The patent implements dynamic adaptation of coding rates based on the type of feedback signal received. When a third feedback signal indicating replacement data request is received, the system dynamically adjusts to use lower coding rates for replacement data transmission. This dynamic adjustment ensures higher decoding success probability for replacement data while maintaining optimal throughput by using higher coding rates for successful transmissions and standard retransmissions.
Solution Approach 2:
The patent changes the coding rate parameter dynamically based on feedback signal type. For replacement data transmissions triggered by the new third feedback signal, the system applies lower coding rates to enhance decoding reliability. This parameter change strategy balances transmission speed and decoding success probability by adapting the coding rate to the specific transmission context and failure mode.
Data Source
AI summary
An operating method of a receiving device may include receiving data from a target transmitting device of at least one transmitting device via a sidelink channel, determining whether to request transmission of replacement data for the data from the target transmitting device according to a performance result of a hybrid automatic repeat request (HARQ) process on the data, and when transmission of the replacement data is requested, transmitting to the target transmitting device a replacement data request signal distinct from an acknowledge (ACK) signal and a negative-ACK (NACK) signal.