HARQ ID Determination for 5G Uplink Grant-Free Transmission
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Solution Overview
Problem
In the 5G NR system's uplink grant-free repeated transmission scheme, multiple configurations lead to large latency due to the influence of maximum HARQ processes when determining HARQ IDs, especially when multiple configurations exist simultaneously.
Innovation Solution
The HARQ ID for uplink transmission is determined based on the association relationship between the detected configuration and a predetermined configuration, minimizing the impact of maximum HARQ processes by using a method that considers the time domain position and sequence number of OFDM symbols within the target period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple configurations are adopted for uplink grant-free repeated transmission, then reliability is improved, but latency increases due to the influence of maximum quantity of HARQ processes
Solution Approach 1:
The patent changes the parameter for HARQ ID determination from being based on maximum HARQ process quantity to being based on time domain position and OFDM symbol sequence numbers. This parameter transformation allows multiple configurations to share a unified HARQ ID space, eliminating the latency penalty while maintaining the reliability benefits of multiple configurations
Solution Approach 2:
The patent creates a universal HARQ ID determination mechanism that works across all configurations regardless of their specific time domain positions or periodicities. By using a common formula based on absolute time domain positions and OFDM symbol sequences, the system achieves multi-functionality where the same HARQ ID allocation method serves multiple configurations simultaneously without conflict
Data Source
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AI summary
An information determination method, an information determination apparatus, and a device are provided. The information determination method includes: for multiple configurations of uplink grant-free transmission, detecting uplink transmission on a resource corresponding to at least one of the multiple configurations; and in a case that a first configuration corresponding to a resource where the uplink transmission is detected is not a predetermined configuration, determining an HARQ ID of the detected uplink transmission, according to association information between the first configuration and the predetermined configuration.