Sidelink SCI Resource Reservation for URLLC
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Solution Overview
Problem
Sidelink communications in wireless networks struggle to meet stringent ultra-reliable low-latency communication (URLLC) requirements due to relaxed quality of service (QoS) and lower radio efficiency compared to access links, particularly in industrial Internet-of-Things (IIoT) deployments with poor network coverage.
Innovation Solution
Implementing a method that includes transmitting a stage one sidelink control information (SCI) message to multiple receiver UEs to indicate resource reservations and using a configured grant for physical sidelink shared channel (PSSCH) transmissions, along with mini-slot based resource allocation and NACK-triggered retransmissions to enhance radio efficiency and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink communications use relaxed QoS and conventional resource allocation, then device complexity is reduced and ease of operation is improved, but latency increases and reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring grant resources and mini-slot allocations before actual data transmission is needed. The transmitter UE and receiver UEs establish predetermined resource reservations through stage one SCI messages, so that when URLLC data arrives, transmission can immediately occur without complex real-time scheduling decisions, thus achieving high reliability with controlled complexity
Solution Approach 2:
The patent segments the resource allocation process into distinct stages: stage one SCI messages for resource reservation, stage two SCI messages for data transmission, and configured grant resources for retransmissions. This segmentation allows each component to be optimized independently, with resource reservations made in advance and data transmission handled through pre-allocated resources, resolving the contradiction between reliability and complexity
2Productivity
If sidelink communications use conventional slot-based resource allocation, then resource management is simplified, but latency increases and radio efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic mini-slot based resource allocation that allows transmissions to occur at flexible time points within a slot rather than waiting for slot boundaries. This dynamic approach enables the system to adapt to URLLC traffic patterns by immediately allocating resources when needed, significantly reducing latency and improving radio efficiency compared to rigid slot-based allocation
Solution Approach 2:
The patent changes the fundamental time allocation parameter from slot-based (fixed duration) to mini-slot-based (variable, shorter duration). By modifying this parameter, the system can allocate resources in smaller, more granular time units that match the bursty nature of URLLC traffic, thereby improving both productivity and reducing time loss without complicating resource management
3Use of energy by moving object
If sidelink communications transmit to multiple receiver UEs using configured grants, then resource utilization is improved, but the complexity of managing multiple resource reservations increases
Solution Approach 1:
The patent merges multiple resource reservations into a single stage one SCI message that can indicate reservations for multiple receiver UEs simultaneously. Instead of managing separate reservations for each UE, the system combines them into one unified control structure, improving resource utilization efficiency while keeping the management complexity manageable through standardized message formats
Data Source
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.