Radio Node Retransmission Timing for HARQ Latency
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Solution Overview
Problem
Current wireless communication technologies face challenges in optimizing acknowledgement signaling timing, leading to increased latency in data transmission, particularly in retransmissions, which can hinder efficient data delivery and meet stringent latency requirements.
Innovation Solution
A method and system for determining transmission timing in radio nodes of a Radio Access Network (RAN) based on retransmission indications, allowing for adaptive timing adjustments between first-time and retransmitted data elements, thereby optimizing latency and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If fixed transmission timing is used for all data elements, then timing simplicity is maintained, but latency increases for retransmitted data elements
Solution Approach 1:
The patent applies dynamics by making the transmission timing variable rather than fixed. The transmission timing is dynamically adjusted based on whether the data element is a first transmission or a retransmission, and on the HARQ process state. This allows the system to adapt timing to specific transmission conditions, reducing latency for retransmissions while maintaining manageable complexity through structured dynamic behavior.
Solution Approach 2:
The patent changes the timing parameter based on transmission type. Different time offsets are applied depending on whether it's a first transmission or retransmission, and depending on the HARQ process configuration. This parameter change approach enables optimized latency for retransmissions without requiring complete redesign of the timing mechanism.
2Loss of time
If earlier transmission timing is provided for retransmitted data elements, then latency is reduced, but timing coordination complexity increases
Solution Approach 1:
The patent uses feedback from the HARQ acknowledgment process to determine transmission timing. The transmitting radio node receives HARQ feedback indicating whether data was correctly received, and this feedback directly influences the timing of subsequent transmissions. This feedback mechanism enables automated timing adjustment without complex manual coordination, reducing latency while keeping coordination manageable through standardized feedback loops.
Solution Approach 2:
The patent establishes preliminary timing relationships and configurations for HARQ processes before actual data transmission begins. By pre-configuring timing offsets and transmission parameters, the system avoids complex real-time coordination decisions, enabling earlier retransmission timing while maintaining coordination simplicity through advance planning.
3Productivity
If adaptive transmission timing based on retransmission indication is implemented, then spectral efficiency improves, but processing complexity increases
Solution Approach 1:
The patent implements dynamic selection of transmission timing based on the retransmission indication from HARQ feedback. The system dynamically adjusts whether to use earlier or standard timing depending on whether the data element requires retransmission. This dynamic adaptation improves spectral efficiency by optimizing resource usage while maintaining processing complexity at acceptable levels through structured decision logic.
Solution Approach 2:
The patent changes transmission timing parameters based on the retransmission indication. When a NACK is received indicating retransmission is needed, the system applies different timing parameters that enable earlier retransmission. This parameter adaptation improves spectral efficiency by reducing idle time and optimizing resource allocation without requiring fundamentally complex processing changes.
Data Source
AI summary
There is disclosed a method of operating a radio node in a Radio Access Network, RAN. The method includes transmitting, according to a transmission timing, a data element of a data stream associated to an acknowledgement signaling process. The transmission timing is determined based on a retransmission indication indicating whether the data element is to be transmitted the first time in the data stream, or is to be retransmitted in the data stream. The disclosure also pertains to related methods and devices.