HARQ Process Identification for IIoT Latency Reduction
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Solution Overview
Problem
In industrial IoT (IIoT) deployments, the large amount of signaling overhead required for configuring and tracking hybrid automatic repeat request (HARQ) feedback leads to increased latency and decreased reliability due to the need to track multiple HARQ processes across multiple time cycles, which is inefficient in delay-constrained environments.
Innovation Solution
Configuring a quantity of HARQ processes based on the number of data communications to be transmitted within a single delay-constrained time cycle, allowing the receiver and transmitter to manage HARQ processes within that cycle without needing to track processes across multiple cycles, thereby reducing signaling overhead and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple HARQ processes are configured and tracked across multiple time cycles, then the system can handle more data communications, but the signaling overhead increases and reliability decreases
Solution Approach 1:
The patent divides the HARQ process tracking into separate time cycles, where each time cycle independently manages its own HARQ processes. This segmentation allows the system to handle multiple data communications across different time cycles without requiring continuous tracking of all HARQ processes across all cycles, thereby reducing signaling overhead while maintaining the capacity to handle multiple communications through structured division of tracking responsibilities.
2Productivity
If multiple HARQ processes are configured and tracked across multiple time cycles, then the system can handle more data communications, but the signaling overhead increases
Solution Approach 1:
The patent segments HARQ process tracking by time cycle, where each time cycle independently manages its own HARQ processes. This segmentation reduces the need for continuous signaling across multiple cycles to track the same HARQ processes, thereby reducing signaling overhead while maintaining the capacity to handle multiple data communications through structured division of tracking responsibilities.
Solution Approach 2:
The patent configures HARQ processes to be completed within a single time cycle rather than spanning multiple cycles. This preliminary action approach ensures that HARQ feedback is resolved within the configured time cycle, eliminating the need for extended tracking and reducing the signaling overhead required to maintain HARQ state information across multiple cycles.
3Productivity
If HARQ processes are tracked across multiple time cycles, then more data communications can be scheduled, but latency increases
Solution Approach 1:
The patent configures HARQ processes with a predetermined time cycle duration, requiring that each HARQ process be completed within that single time cycle. This preliminary action approach ensures that feedback is received and processed within the configured timeframe, preventing latency accumulation from extended tracking across multiple cycles while maintaining throughput through structured time-bound process management.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a receiver may identify a hybrid automatic repeat request (HARQ) process, from one or more HARQ processes configured for a delay-constrained time cycle, for a data communication received from a transmitter in the delay-constrained time cycle. A quantity of the one or more HARQ processes may be based at least in part on a quantity of data communications that the receiver is to receive from a transmitter during the delay-constrained time cycle. The receiver may transmit, to the transmitter and based at least in part on the data communication, HARQ feedback associated with the HARQ process. Numerous other aspects are provided.