NR V2X Sidelink Allocation with Slot Aggregation and Power Control
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Solution Overview
Problem
The NR V2X system faces challenges in supporting larger data packets and diverse service types, requiring improved UE autonomous resource allocation methods, especially in Mode 2, and lacks clear technical details for pathloss-based closed loop power control in sidelink communications.
Innovation Solution
A method for sidelink transmission involving slot aggregation, resource reselection based on SCI, and closed loop power control based on sidelink pathloss is proposed, including parameter configurations for slot aggregation, resource selection, and power adjustment mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE autonomous resource allocation is implemented in NR V2X Mode 2, then flexibility and adaptability are improved, but resource collision and interference increase
Solution Approach 1:
The patent implements preliminary resource selection and reservation mechanisms where UEs perform sensing and resource selection in advance before actual transmission. The protocol defines procedures for sensing windows, resource selection windows, and reservation signaling that allow UEs to preemptively identify and reserve resources, reducing the likelihood of collisions when multiple UEs operate autonomously.
Solution Approach 2:
The patent establishes feedback mechanisms including HARQ (Hybrid Automatic Repeat Request) protocols and power control commands that enable receiving UEs to provide feedback to transmitting UEs. This feedback loop allows the system to detect and resolve resource conflicts, adjust transmission parameters, and optimize resource allocation dynamically based on actual channel conditions and interference levels.
2Productivity
If larger data packets are transmitted, then data throughput is improved, but transmission time and resource requirements increase
Solution Approach 1:
The patent merges multiple transmission time units into aggregated slots, allowing multiple smaller transmissions to be combined into a single larger transmission opportunity. This slot aggregation mechanism enables the system to handle larger data packets by consolidating resources across multiple time slots, thereby improving throughput while managing transmission time through structured aggregation rather than sequential transmissions.
3Reliability
If transmit power is increased to improve coverage, then transmission reliability is improved, but interference to other UEs increases
Solution Approach 1:
The patent implements dynamic power control mechanisms where transmit power is not fixed but adjusted based on real-time channel conditions, interference levels, and received power measurements. The system uses pathloss-based power control and closed-loop feedback to dynamically optimize transmit power, allowing UEs to use higher power when needed for coverage while reducing power when interference to other UEs becomes problematic, thus balancing reliability and interference management.
Data Source
AI summary
The present disclosure provides a method for sidelink transmission, the method comprising: determining by a User equipment (UE) a parameter configuration for the slot aggregation transmission; determining by the UE an resource for slot aggregation based on the parameter configuration; and performing by the UE the Physical Sidelink Shared Channel (PSSCH) transmission and the associated Physical Sidelink Control Channel (PSCCH) transmission on the resource for slot aggregation.