Sidelink Resource Reservation for URLLC Reliability and Low Latency
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Solution Overview
Problem
Sidelink communications in wireless networks, particularly in Industrial IoT (IIoT) deployments, struggle to meet stringent ultra-reliable low-latency communication (URLLC) requirements due to relaxed quality of service, lower radio efficiency, and challenges in resource allocation.
Innovation Solution
Implementing techniques such as configured grants or semi-persistent scheduling, retransmissions triggered by negative acknowledgments, and mini-slot based resource allocation to enhance sidelink communications, reducing control overhead and improving radio efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sidelink resource allocation is used, then device complexity is reduced, but reliability and latency performance deteriorate and cannot meet URLLC requirements
Solution Approach 1:
The patent segments resource allocation into two distinct modes: Mode 1 (base station-controlled) for high reliability URLLC traffic, and Mode 2 (autonomous) for other traffic. This segmentation allows specialized handling of URLLC requirements while maintaining simplicity for non-URLLC traffic, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent implements preliminary configuration of resource pools and allocation parameters by the base station before URLLC transmission occurs. This preliminary action prepares the system in advance for URLLC requirements, enabling high reliability transmission without requiring complex real-time decision-making at the device level.
2Productivity
If autonomous resource selection is used, then device complexity is reduced, but radio efficiency deteriorates due to lack of centralized coordination
Solution Approach 1:
The base station acts as an intermediary that centrally coordinates resource allocation for URLLC traffic. It configures dedicated resource pools and allocation parameters, mediating between devices to optimize radio efficiency through centralized control while devices simply follow the pre-configured instructions, reducing their complexity.
3Loss of time
If dynamic resource allocation is used, then adaptability is improved, but latency increases due to control signaling overhead
Solution Approach 1:
The base station performs preliminary configuration of resource pools and allocation parameters before URLLC transmission is needed. This advance preparation eliminates the need for time-consuming dynamic control signaling during actual URLLC transmission, reducing latency while maintaining adaptability through pre-configured options.
Solution Approach 2:
The patent implements semi-persistent scheduling that combines static pre-configuration with dynamic adaptation. Resources are initially allocated statically for low latency, but can be dynamically adjusted through pre-configured mechanisms when needed, achieving both low latency and adaptability.
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter user equipment (UE) may transmit a stage one sidelink control information (SCI) message to multiple receiver UEs. In some aspects, the stage one SCI message may indicate respective resource reservations for multiple sidelink transmissions to the multiple receiver UEs. The transmitter UE may transmit a physical sidelink shared channel (PSSCH) to a subset of the multiple receiver UEs based at least in part on a configured grant associated with the subset of the multiple receiver UEs and the respective resource reservations indicated in the stage one SCI message. Numerous other aspects are provided.